// Command plugin-admin is the standalone Business Plugin V1 control plane.
// It deliberately lives outside Sub2API Core: Core remains the authority for
// identity and business data while this service owns plugin packages,
// revisions, lifecycle state, configuration metadata and menu intents.
package main

import (
	"archive/zip"
	"bytes"
	"context"
	"crypto/aes"
	"crypto/cipher"
	"crypto/rand"
	"crypto/sha256"
	"embed"
	"encoding/base64"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"html"
	"io"
	"log/slog"
	"mime"
	"net"
	"net/http"
	"net/url"
	"os"
	"os/exec"
	"os/signal"
	"path"
	"path/filepath"
	"regexp"
	"sort"
	"strconv"
	"strings"
	"sync"
	"syscall"
	"time"

	"git.awaioi.com/awaioi/sub2api-add/plugins/plugin-admin/internal/manifest"
)

const (
	pluginID              = "qiu.plugin-admin"
	subscriptionPluginID  = "qiu.subscription-admin"
	pluginVersion         = "1.1.1"
	sessionCookieName     = "plugin_admin_session"
	maxJSONBytes          = 2 << 20
	maxPackageBytes       = 128 << 20
	maxPackageFiles       = 512
	maxUncompressedBytes  = 256 << 20
	defaultSessionTTL     = 30 * time.Minute
	defaultSessionMaxTTL  = 8 * time.Hour
	loginWindow           = time.Minute
	loginLimit            = 10
	maxPendingLogins      = 1024
	pendingLoginTTL       = 5 * time.Minute
	defaultOperationLimit = 200
	maxOperationBodyBytes = maxPackageBytes + (4 << 20)
)

//go:embed ui/*
var uiFS embed.FS

var requestIDPattern = regexp.MustCompile(`^[A-Za-z0-9._:-]{1,64}$`)
var coreMenuIDPattern = regexp.MustCompile(`^[A-Za-z0-9_-]+$`)

type coreEnvelope struct {
	Code    int             `json:"code"`
	Message string          `json:"message"`
	Data    json.RawMessage `json:"data"`
	status  int
}

type coreError struct{ status int }

func (e *coreError) Error() string { return "core request failed" }

type coreClient struct {
	base  string
	http  *http.Client
	admin map[string]struct{}
	mu    sync.Mutex
}

func newCoreClient(raw string) (*coreClient, error) {
	raw = strings.TrimRight(strings.TrimSpace(raw), "/")
	u, err := url.Parse(raw)
	if err != nil || u.Host == "" || (u.Scheme != "http" && u.Scheme != "https") || u.User != nil || u.RawQuery != "" || u.Fragment != "" || (u.Path != "" && u.Path != "/") {
		return nil, errors.New("CORE_BASE_URL must be an absolute origin without credentials, path, query or fragment")
	}
	if u.Scheme == "http" && !isLoopbackHost(u.Hostname()) {
		return nil, errors.New("CORE_BASE_URL must use HTTPS unless Core is on loopback")
	}
	transport := http.DefaultTransport.(*http.Transport).Clone()
	transport.Proxy = nil
	return &coreClient{base: raw, http: &http.Client{Timeout: 10 * time.Second, Transport: transport, CheckRedirect: func(_ *http.Request, _ []*http.Request) error { return http.ErrUseLastResponse }}}, nil
}

func isLoopbackHost(host string) bool {
	if strings.EqualFold(strings.TrimSuffix(host, "."), "localhost") {
		return true
	}
	ip := net.ParseIP(host)
	return ip != nil && ip.IsLoopback()
}

func (c *coreClient) call(ctx context.Context, method, requestPath string, body any, accessToken, requestID string, clientIPs ...string) (coreEnvelope, error) {
	if c == nil {
		return coreEnvelope{}, errors.New("core client unavailable")
	}
	if !allowedCorePath(method, requestPath) {
		return coreEnvelope{}, errors.New("core path is not in the control-plane allowlist")
	}
	var reader io.Reader
	if body != nil {
		payload, err := json.Marshal(body)
		if err != nil {
			return coreEnvelope{}, err
		}
		reader = bytes.NewReader(payload)
	}
	req, err := http.NewRequestWithContext(ctx, method, c.base+requestPath, reader)
	if err != nil {
		return coreEnvelope{}, err
	}
	req.Header.Set("Accept", "application/json")
	if body != nil {
		req.Header.Set("Content-Type", "application/json")
	}
	if accessToken != "" {
		req.Header.Set("Authorization", "Bearer "+accessToken)
	}
	requestID = normalizeRequestID(requestID)
	req.Header.Set("X-Request-Id", requestID)
	if len(clientIPs) > 0 && net.ParseIP(strings.TrimSpace(clientIPs[0])) != nil {
		clientIP := strings.TrimSpace(clientIPs[0])
		req.Header.Set("X-Forwarded-For", clientIP)
		req.Header.Set("X-Real-IP", clientIP)
	}
	res, err := c.http.Do(req)
	if err != nil {
		return coreEnvelope{}, err
	}
	defer res.Body.Close()
	var out coreEnvelope
	if err := json.NewDecoder(io.LimitReader(res.Body, 4<<20)).Decode(&out); err != nil {
		return coreEnvelope{}, err
	}
	out.status = res.StatusCode
	if res.StatusCode >= 300 || out.Code != 0 {
		status := res.StatusCode
		if status < 400 && out.Code >= 400 {
			status = out.Code
		}
		return out, &coreError{status: status}
	}
	return out, nil
}

func allowedCorePath(method, p string) bool {
	parsed, err := url.Parse(p)
	if err != nil || parsed.Host != "" || parsed.Scheme != "" || parsed.Fragment != "" || strings.Contains(parsed.Path, "\\") {
		return false
	}
	pathName := parsed.Path
	if method == http.MethodGet {
		if pathName == "/api/v1/auth/me" || pathName == "/api/v1/settings/public" || pathName == "/api/v1/admin/settings" {
			return len(parsed.Query()) == 0
		}
		return allowedSubscriptionReadPath(pathName) && validSubscriptionQuery(parsed.Query())
	}
	if len(parsed.Query()) != 0 {
		return false
	}
	return method == http.MethodPut && pathName == "/api/v1/admin/settings" || method == http.MethodPost && (pathName == "/api/v1/auth/login" || pathName == "/api/v1/auth/login/2fa" || pathName == "/api/v1/auth/refresh" || pathName == "/api/v1/auth/logout")
}

func positiveID(value string) bool {
	value = strings.TrimSpace(value)
	if value == "" || strings.ContainsAny(value, "/\\") {
		return false
	}
	n, err := strconv.ParseInt(value, 10, 64)
	return err == nil && n > 0
}

func allowedSubscriptionReadPath(pathName string) bool {
	if pathName == "/api/v1/admin/payment/plans" || pathName == "/api/v1/admin/subscriptions" {
		return true
	}
	if strings.HasPrefix(pathName, "/api/v1/admin/subscriptions/") {
		return positiveID(strings.TrimPrefix(pathName, "/api/v1/admin/subscriptions/"))
	}
	if strings.HasPrefix(pathName, "/api/v1/admin/users/") {
		rest := strings.TrimPrefix(pathName, "/api/v1/admin/users/")
		if positiveID(rest) {
			return true
		}
		parts := strings.Split(rest, "/")
		return len(parts) == 2 && positiveID(parts[0]) && parts[1] == "subscriptions"
	}
	return false
}

func validSubscriptionQuery(values url.Values) bool {
	allowed := map[string]bool{"page": true, "page_size": true, "limit": true, "user_id": true, "group_id": true, "status": true, "platform": true, "sort_by": true, "sort_order": true}
	for key, entries := range values {
		if !allowed[key] {
			return false
		}
		for _, value := range entries {
			value = strings.TrimSpace(value)
			if value == "" || len(value) > 100 {
				return false
			}
			if key == "page" || key == "page_size" || key == "limit" || key == "user_id" || key == "group_id" {
				n, err := strconv.ParseUint(value, 10, 63)
				if err != nil || n == 0 || ((key == "page_size" || key == "limit") && n > 100) {
					return false
				}
			}
		}
	}
	return true
}

func sanitizeSubscriptionQuery(values url.Values) url.Values {
	allowed := []string{"page", "page_size", "limit", "user_id", "group_id", "status", "platform", "sort_by", "sort_order"}
	out := url.Values{}
	for _, key := range allowed {
		for _, value := range values[key] {
			value = strings.TrimSpace(value)
			if value == "" || len(value) > 100 {
				continue
			}
			if (key == "page" || key == "page_size" || key == "limit" || key == "user_id" || key == "group_id") && !positiveID(value) {
				continue
			}
			out.Add(key, value)
		}
	}
	return out
}

func (c *coreClient) read(ctx context.Context, requestPath, accessToken, requestID string) (coreEnvelope, error) {
	parsed, err := url.Parse(requestPath)
	if err != nil || parsed.Host != "" || parsed.Scheme != "" || parsed.Fragment != "" || !allowedSubscriptionReadPath(parsed.Path) || !validSubscriptionQuery(parsed.Query()) {
		return coreEnvelope{}, errors.New("core path is not in the subscription allowlist")
	}
	parsed.RawQuery = sanitizeSubscriptionQuery(parsed.Query()).Encode()
	return c.call(ctx, http.MethodGet, parsed.EscapedPath()+func() string {
		if parsed.RawQuery == "" {
			return ""
		}
		return "?" + parsed.RawQuery
	}(), nil, accessToken, requestID)
}

func (c *coreClient) login(ctx context.Context, body any, rid string, clientIP ...string) (coreEnvelope, error) {
	return c.call(ctx, http.MethodPost, "/api/v1/auth/login", body, "", rid, clientIP...)
}
func (c *coreClient) login2FA(ctx context.Context, body any, rid string, clientIP ...string) (coreEnvelope, error) {
	return c.call(ctx, http.MethodPost, "/api/v1/auth/login/2fa", body, "", rid, clientIP...)
}
func (c *coreClient) refresh(ctx context.Context, refresh, rid string) (coreEnvelope, error) {
	return c.call(ctx, http.MethodPost, "/api/v1/auth/refresh", map[string]string{"refresh_token": refresh}, "", rid)
}
func (c *coreClient) logout(ctx context.Context, refresh, rid string) {
	if refresh != "" {
		_, _ = c.call(ctx, http.MethodPost, "/api/v1/auth/logout", map[string]string{"refresh_token": refresh}, "", rid)
	}
}
func (c *coreClient) me(ctx context.Context, access, rid string) (coreEnvelope, error) {
	return c.call(ctx, http.MethodGet, "/api/v1/auth/me", nil, access, rid)
}
func (c *coreClient) settings(ctx context.Context, access, rid string) (coreEnvelope, error) {
	return c.call(ctx, http.MethodGet, "/api/v1/admin/settings", nil, access, rid)
}
func (c *coreClient) publicSettings(ctx context.Context, rid string) (coreEnvelope, error) {
	return c.call(ctx, http.MethodGet, "/api/v1/settings/public", nil, "", rid)
}
func (c *coreClient) updateMenu(ctx context.Context, access, rid string, items []any) (coreEnvelope, error) {
	return c.call(ctx, http.MethodPut, "/api/v1/admin/settings", map[string]any{"custom_menu_items": items}, access, rid)
}

type session struct {
	AccessToken  string         `json:"-"`
	RefreshToken string         `json:"-"`
	CSRFToken    string         `json:"csrf_token"`
	User         map[string]any `json:"user"`
	CreatedAt    time.Time      `json:"created_at"`
	LastSeen     time.Time      `json:"last_seen"`
}

type pendingLogin struct {
	TempToken string
	Expires   time.Time
	ClientIP  string
	Identity  string
}

type revision struct {
	ID         string            `json:"id"`
	Version    string            `json:"version"`
	Path       string            `json:"path"`
	ArchiveSHA string            `json:"archive_sha256"`
	Manifest   manifest.Manifest `json:"manifest"`
	VerifiedAt time.Time         `json:"verified_at"`
	HealthyAt  time.Time         `json:"healthy_at,omitempty"`
	Retired    bool              `json:"retired,omitempty"`
}

type pluginRecord struct {
	Manifest        manifest.Manifest `json:"manifest"`
	State           string            `json:"state"`
	ActiveRevision  string            `json:"active_revision,omitempty"`
	PendingRevision string            `json:"pending_revision,omitempty"`
	PreviousState   string            `json:"previous_state,omitempty"`
	Revisions       []revision        `json:"revisions"`
	ConfigCipher    string            `json:"config_cipher,omitempty"`
	Endpoint        string            `json:"endpoint,omitempty"`
	LastError       string            `json:"last_error,omitempty"`
	UpdatedAt       time.Time         `json:"updated_at"`
}

type operation struct {
	ID             string    `json:"id"`
	IdempotencyKey string    `json:"idempotency_key"`
	Kind           string    `json:"kind"`
	PluginID       string    `json:"plugin_id"`
	Revision       string    `json:"revision,omitempty"`
	ActorID        any       `json:"actor_id,omitempty"`
	RequestID      string    `json:"request_id"`
	RequestHash    string    `json:"request_hash,omitempty"`
	State          string    `json:"state"`
	Error          string    `json:"error,omitempty"`
	Warning        string    `json:"warning,omitempty"`
	CreatedAt      time.Time `json:"created_at"`
	UpdatedAt      time.Time `json:"updated_at"`
}

type auditEvent struct {
	Time      time.Time `json:"time"`
	Action    string    `json:"action"`
	PluginID  string    `json:"plugin_id,omitempty"`
	ActorID   any       `json:"actor_id,omitempty"`
	Operation string    `json:"operation_id,omitempty"`
	RequestID string    `json:"request_id"`
	Result    string    `json:"result"`
}

// stagedRevisionPath keeps an uninstall reversible until the registry commit
// has succeeded. Revision directories are renamed within the installed root,
// then removed after the registry no longer references them.
type stagedRevisionPath struct {
	original string
	staged   string
}

type registryData struct {
	Plugins    map[string]pluginRecord `json:"plugins"`
	Operations []operation             `json:"operations"`
	Audit      []auditEvent            `json:"audit"`
}

func clonePluginRecord(p pluginRecord) pluginRecord {
	p.Revisions = append([]revision(nil), p.Revisions...)
	for i := range p.Revisions {
		p.Revisions[i].Manifest.Capabilities = append([]string(nil), p.Revisions[i].Manifest.Capabilities...)
		p.Revisions[i].Manifest.TestedCoreVersions = append([]string(nil), p.Revisions[i].Manifest.TestedCoreVersions...)
		if p.Revisions[i].Manifest.Files != nil {
			p.Revisions[i].Manifest.Files = make(map[string]string, len(p.Revisions[i].Manifest.Files))
			for key, value := range p.Revisions[i].Manifest.Files {
				p.Revisions[i].Manifest.Files[key] = value
			}
		}
	}
	p.Manifest.Capabilities = append([]string(nil), p.Manifest.Capabilities...)
	p.Manifest.TestedCoreVersions = append([]string(nil), p.Manifest.TestedCoreVersions...)
	if p.Manifest.Files != nil {
		p.Manifest.Files = make(map[string]string, len(p.Manifest.Files))
		for key, value := range p.Manifest.Files {
			p.Manifest.Files[key] = value
		}
	}
	return p
}

type registry struct {
	path string
	mu   sync.Mutex
	data registryData
}

func openRegistry(dir string) (*registry, error) {
	if dir == "" {
		dir = "./data"
	}
	if err := os.MkdirAll(dir, 0o700); err != nil {
		return nil, err
	}
	r := &registry{path: filepath.Join(dir, "registry.json"), data: registryData{Plugins: map[string]pluginRecord{}, Operations: []operation{}, Audit: []auditEvent{}}}
	raw, err := os.ReadFile(r.path)
	if errors.Is(err, os.ErrNotExist) {
		return r, nil
	}
	if err != nil {
		return nil, err
	}
	if err := json.Unmarshal(raw, &r.data); err != nil {
		return nil, fmt.Errorf("decode registry: %w", err)
	}
	if r.data.Plugins == nil {
		r.data.Plugins = map[string]pluginRecord{}
	}
	if r.data.Operations == nil {
		r.data.Operations = []operation{}
	}
	if r.data.Audit == nil {
		r.data.Audit = []auditEvent{}
	}
	changed := false
	for i := range r.data.Operations {
		if r.data.Operations[i].State == "running" && time.Since(r.data.Operations[i].UpdatedAt) > 10*time.Minute {
			r.data.Operations[i].State = "failed"
			r.data.Operations[i].Error = "operation interrupted by control-plane restart"
			r.data.Operations[i].UpdatedAt = time.Now().UTC()
			changed = true
		}
	}
	if changed {
		if err := r.saveLocked(); err != nil {
			return nil, err
		}
	}
	return r, nil
}

func (r *registry) saveLocked() error {
	raw, err := json.MarshalIndent(r.data, "", "  ")
	if err != nil {
		return err
	}
	tmp := r.path + ".tmp-" + token(8)
	if err := os.WriteFile(tmp, raw, 0o600); err != nil {
		return err
	}
	if err := os.Rename(tmp, r.path); err != nil {
		_ = os.Remove(tmp)
		return err
	}
	return nil
}

func (r *registry) save() error { r.mu.Lock(); defer r.mu.Unlock(); return r.saveLocked() }

func (r *registry) addAudit(ev auditEvent) error {
	r.mu.Lock()
	defer r.mu.Unlock()
	previous := append([]auditEvent(nil), r.data.Audit...)
	r.data.Audit = append(r.data.Audit, ev)
	if len(r.data.Audit) > 500 {
		r.data.Audit = r.data.Audit[len(r.data.Audit)-500:]
	}
	if err := r.saveLocked(); err != nil {
		// Do not report an audit event that was not persisted.
		r.data.Audit = previous
		return err
	}
	return nil
}

func (r *registry) operation(kind, pluginID, key string, actor any, rid, requestHash string) (operation, bool, bool, error) {
	r.mu.Lock()
	defer r.mu.Unlock()
	for i := len(r.data.Operations) - 1; i >= 0; i-- {
		op := r.data.Operations[i]
		if op.Kind == kind && op.PluginID == pluginID && key != "" && op.IdempotencyKey == key && fmt.Sprint(op.ActorID) == fmt.Sprint(actor) {
			return op, true, op.RequestHash != "" && requestHash != "" && op.RequestHash != requestHash, nil
		}
	}
	previous := append([]operation(nil), r.data.Operations...)
	op := operation{ID: token(16), IdempotencyKey: key, Kind: kind, PluginID: pluginID, ActorID: actor, RequestID: rid, RequestHash: requestHash, State: "running", CreatedAt: time.Now().UTC(), UpdatedAt: time.Now().UTC()}
	r.data.Operations = append(r.data.Operations, op)
	if len(r.data.Operations) > defaultOperationLimit {
		r.data.Operations = r.data.Operations[len(r.data.Operations)-defaultOperationLimit:]
	}
	if err := r.saveLocked(); err != nil {
		r.data.Operations = previous
		return operation{}, false, false, err
	}
	return op, false, false, nil
}

func (r *registry) finishOperation(op operation, operationErr error) (operation, error) {
	r.mu.Lock()
	defer r.mu.Unlock()
	previous := operation{}
	found := false
	for i := range r.data.Operations {
		if r.data.Operations[i].ID == op.ID {
			previous = r.data.Operations[i]
			found = true
			break
		}
	}
	if !found {
		return op, errors.New("operation not found")
	}
	op.State = "completed"
	if operationErr != nil {
		op.State = "failed"
		op.Error = sanitizeError(operationErr)
	}
	op.UpdatedAt = time.Now().UTC()
	for i := range r.data.Operations {
		if r.data.Operations[i].ID == op.ID {
			r.data.Operations[i] = op
			break
		}
	}
	if err := r.saveLocked(); err != nil {
		if found {
			for i := range r.data.Operations {
				if r.data.Operations[i].ID == op.ID {
					r.data.Operations[i] = previous
					break
				}
			}
		} else if len(r.data.Operations) > 0 {
			r.data.Operations = r.data.Operations[:len(r.data.Operations)-1]
		}
		return op, err
	}
	return op, nil
}

func (r *registry) setOperationPlugin(operationID, pluginID string) error {
	r.mu.Lock()
	defer r.mu.Unlock()
	for i := range r.data.Operations {
		if r.data.Operations[i].ID != operationID {
			continue
		}
		previous := r.data.Operations[i]
		r.data.Operations[i].PluginID = pluginID
		if err := r.saveLocked(); err != nil {
			r.data.Operations[i] = previous
			return err
		}
		return nil
	}
	return errors.New("operation not found")
}

func sanitizeError(err error) string {
	if err == nil {
		return ""
	}
	message := strings.TrimSpace(err.Error())
	for _, secret := range []string{"Bearer ", "refresh_token", "password", "api_key", "secret"} {
		if strings.Contains(strings.ToLower(message), strings.ToLower(secret)) {
			return "operation failed"
		}
	}
	if len(message) > 240 {
		return message[:240]
	}
	return message
}

type app struct {
	core              *coreClient
	registry          *registry
	root              string
	publicBasePath    string
	publicURL         string
	cookiePath        string
	cookieSecure      bool
	cookieSameSite    http.SameSite
	frameAncestors    []string
	allowUnsigned     bool
	trustedPublishers map[string][]byte
	configKey         []byte
	sessions          map[string]session
	sessionLocks      map[string]*sync.Mutex
	pending           map[string]pendingLogin
	loginAttempts     map[string]loginAttempt
	trustProxy        bool
	clock             func() time.Time
	processes         map[string]*exec.Cmd
	pluginLocks       map[string]*sync.Mutex
	marketplaceConfig marketplaceService
	mu                sync.Mutex
}

func newApp(core *coreClient, r *registry, root string) *app {
	key := sha256.Sum256([]byte(token(32)))
	marketplace, _ := newMarketplaceService(filepath.Join(root, "marketplace", "index.json"), "", true)
	return &app{core: core, registry: r, root: root, cookiePath: "/", cookieSameSite: http.SameSiteLaxMode, frameAncestors: []string{"'self'"}, configKey: key[:], sessions: map[string]session{}, sessionLocks: map[string]*sync.Mutex{}, pending: map[string]pendingLogin{}, loginAttempts: map[string]loginAttempt{}, clock: time.Now, processes: map[string]*exec.Cmd{}, pluginLocks: map[string]*sync.Mutex{}, marketplaceConfig: marketplace}
}

type loginAttempt struct {
	Started time.Time
	Count   int
}

func (a *app) lockPlugin(id string) func() {
	a.mu.Lock()
	lock := a.pluginLocks[id]
	if lock == nil {
		lock = &sync.Mutex{}
		a.pluginLocks[id] = lock
	}
	a.mu.Unlock()
	lock.Lock()
	return lock.Unlock
}

func requestID(r *http.Request) string {
	if r == nil {
		return token(12)
	}
	value := strings.TrimSpace(r.Header.Get("X-Request-Id"))
	if requestIDPattern.MatchString(value) {
		return value
	}
	return token(12)
}

func normalizeRequestID(value string) string {
	value = strings.TrimSpace(value)
	if requestIDPattern.MatchString(value) {
		return value
	}
	return token(12)
}

func token(n int) string {
	b := make([]byte, n)
	if _, err := rand.Read(b); err != nil {
		panic(err)
	}
	return hex.EncodeToString(b)
}

func (a *app) now() time.Time {
	if a != nil && a.clock != nil {
		return a.clock()
	}
	return time.Now()
}

// trustedClientIP only accepts forwarded client identity from a loopback peer
// when explicitly enabled. Direct/non-proxy requests use RemoteAddr, so an
// attacker cannot spoof the login limiter key with an arbitrary header.
func (a *app) trustedClientIP(r *http.Request) string {
	if r == nil {
		return ""
	}
	host, _, err := net.SplitHostPort(strings.TrimSpace(r.RemoteAddr))
	if err != nil {
		host = strings.TrimSpace(r.RemoteAddr)
	}
	peer := net.ParseIP(host)
	if a != nil && a.trustProxy && peer != nil && peer.IsLoopback() {
		for _, value := range strings.Split(r.Header.Get("X-Forwarded-For"), ",") {
			if ip := net.ParseIP(strings.TrimSpace(value)); ip != nil {
				return ip.String()
			}
		}
	}
	if peer != nil {
		return peer.String()
	}
	return "unknown"
}

func (a *app) allowLoginAttempt(r *http.Request, identity string) bool {
	if a == nil {
		return false
	}
	key := a.trustedClientIP(r) + "|" + strings.ToLower(strings.TrimSpace(identity))
	now := a.now()
	a.mu.Lock()
	defer a.mu.Unlock()
	if a.loginAttempts == nil {
		a.loginAttempts = map[string]loginAttempt{}
	}
	// Bound the map while opportunistically removing expired buckets.
	for candidate, attempt := range a.loginAttempts {
		if now.Sub(attempt.Started) >= loginWindow {
			delete(a.loginAttempts, candidate)
		}
	}
	attempt := a.loginAttempts[key]
	if attempt.Started.IsZero() || now.Sub(attempt.Started) >= loginWindow {
		attempt = loginAttempt{Started: now}
	}
	if attempt.Count >= loginLimit {
		a.loginAttempts[key] = attempt
		return false
	}
	attempt.Count++
	a.loginAttempts[key] = attempt
	return true
}

func (a *app) addPendingLogin(value pendingLogin) (string, bool) {
	a.mu.Lock()
	defer a.mu.Unlock()
	now := a.now()
	for id, pending := range a.pending {
		if !pending.Expires.After(now) {
			delete(a.pending, id)
		}
	}
	if len(a.pending) >= maxPendingLogins {
		return "", false
	}
	if a.pending == nil {
		a.pending = map[string]pendingLogin{}
	}
	id := token(16)
	a.pending[id] = value
	return id, true
}

func decodeJSON(r *http.Request, dst any, limit int64) error {
	if r == nil || r.Body == nil {
		return errors.New("request body is required")
	}
	defer r.Body.Close()
	raw, err := io.ReadAll(io.LimitReader(r.Body, limit+1))
	if err != nil {
		return err
	}
	if int64(len(raw)) > limit {
		return errors.New("request body exceeds size limit")
	}
	if len(bytes.TrimSpace(raw)) == 0 {
		return errors.New("request body is required")
	}
	dec := json.NewDecoder(bytes.NewReader(raw))
	dec.DisallowUnknownFields()
	if err := dec.Decode(dst); err != nil {
		return err
	}
	var trailing any
	if err := dec.Decode(&trailing); err != io.EOF {
		if err == nil {
			return errors.New("request body must contain exactly one JSON value")
		}
		return err
	}
	return nil
}

func writeJSON(w http.ResponseWriter, status int, value any) {
	w.Header().Set("Cache-Control", "no-store")
	w.Header().Set("Content-Type", "application/json; charset=utf-8")
	w.WriteHeader(status)
	_ = json.NewEncoder(w).Encode(value)
}

func (a *app) setCookie(w http.ResponseWriter, id string, maxAge int) {
	http.SetCookie(w, &http.Cookie{Name: sessionCookieName, Value: id, Path: a.cookiePath, HttpOnly: true, Secure: a.cookieSecure, SameSite: a.cookieSameSite, MaxAge: maxAge})
}

func (a *app) sessionFromRequest(r *http.Request) (string, session, bool) {
	c, err := r.Cookie(sessionCookieName)
	if err != nil || c.Value == "" {
		return "", session{}, false
	}
	a.mu.Lock()
	defer a.mu.Unlock()
	s, ok := a.sessions[c.Value]
	if !ok {
		return "", session{}, false
	}
	now := a.now()
	if now.Sub(s.CreatedAt) > defaultSessionMaxTTL || now.Sub(s.LastSeen) > defaultSessionTTL {
		delete(a.sessions, c.Value)
		delete(a.sessionLocks, c.Value)
		return "", session{}, false
	}
	s.LastSeen = now
	a.sessions[c.Value] = s
	return c.Value, s, true
}

func publicUser(user map[string]any) map[string]any {
	out := map[string]any{}
	for key, value := range user {
		lower := strings.ToLower(key)
		if strings.Contains(lower, "token") || strings.Contains(lower, "password") || strings.Contains(lower, "secret") || lower == "api_key" || lower == "refresh_token" {
			continue
		}
		out[key] = value
	}
	return out
}

func envelopeData(e coreEnvelope) map[string]any {
	var data map[string]any
	if len(e.Data) > 0 && json.Unmarshal(e.Data, &data) == nil && data != nil {
		return data
	}
	return map[string]any{}
}

func menuItemsFromSettings(data map[string]any) []any {
	if raw, ok := data["custom_menu_items"].([]any); ok {
		return raw
	}
	if encoded, ok := data["custom_menu_items"].(string); ok && strings.TrimSpace(encoded) != "" {
		var items []any
		if json.Unmarshal([]byte(encoded), &items) == nil {
			return items
		}
	}
	return nil
}

// Core's custom_menu_items contract is narrower than the plugin ID contract:
// dots are valid namespace separators for plugin IDs, but Core accepts only
// ASCII letters, digits, hyphens, and underscores in menu IDs. Keep the
// namespace-shaped plugin ID in the registry and derive a stable Core-safe ID
// only at the integration boundary.
func coreMenuID(raw string) (string, error) {
	raw = strings.TrimSpace(raw)
	if raw == "" {
		return "", errors.New("plugin menu id is required")
	}
	if len(raw) <= 32 && coreMenuIDPattern.MatchString(raw) {
		return raw, nil
	}
	var b strings.Builder
	lastSeparator := false
	for _, r := range raw {
		if (r >= 'a' && r <= 'z') || (r >= 'A' && r <= 'Z') || (r >= '0' && r <= '9') || r == '_' || r == '-' {
			b.WriteRune(r)
			lastSeparator = false
			continue
		}
		if !lastSeparator {
			b.WriteByte('-')
			lastSeparator = true
		}
	}
	value := strings.Trim(b.String(), "-_")
	if value == "" {
		return "", errors.New("plugin menu id cannot be represented as a Core menu id")
	}
	if len(value) > 32 {
		sum := sha256.Sum256([]byte(raw))
		suffix := "-" + hex.EncodeToString(sum[:])[:8]
		prefixLen := 32 - len(suffix)
		value = strings.TrimRight(value[:prefixLen], "-_") + suffix
	}
	if !coreMenuIDPattern.MatchString(value) || len(value) > 32 {
		return "", errors.New("plugin menu id cannot be represented as a Core menu id")
	}
	return value, nil
}

func coreMenuIDSet(raw string) map[string]struct{} {
	ids := map[string]struct{}{strings.TrimSpace(raw): {}}
	if normalized, err := coreMenuID(raw); err == nil {
		ids[normalized] = struct{}{}
	}
	return ids
}

func menuItemHasID(item any, ids map[string]struct{}) bool {
	object, ok := item.(map[string]any)
	if !ok {
		return false
	}
	id, _ := object["id"].(string)
	_, ok = ids[id]
	return ok
}

func isAdmin(user map[string]any) bool {
	role, _ := user["role"].(string)
	return strings.EqualFold(role, "admin") || strings.EqualFold(role, "administrator")
}

func (a *app) login(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	var in struct {
		Email                 string `json:"email"`
		Password              string `json:"password"`
		TurnstileToken        string `json:"turnstile_token,omitempty"`
		TencentCaptchaTicket  string `json:"tencent_captcha_ticket,omitempty"`
		TencentCaptchaRandstr string `json:"tencent_captcha_randstr,omitempty"`
	}
	if err := decodeJSON(r, &in, 1<<20); err != nil || strings.TrimSpace(in.Email) == "" || in.Password == "" {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid credentials"})
		return
	}
	if a.core == nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "core unavailable"})
		return
	}
	clientIP := a.trustedClientIP(r)
	if !a.allowLoginAttempt(r, in.Email) {
		w.Header().Set("Retry-After", strconv.Itoa(int(loginWindow/time.Second)))
		writeJSON(w, http.StatusTooManyRequests, map[string]string{"error": "too many login attempts"})
		return
	}
	out, err := a.core.login(r.Context(), in, requestID(r), clientIP)
	if err != nil {
		a.coreError(w, err, "core login failed")
		return
	}
	data := envelopeData(out)
	if requires, _ := data["requires_2fa"].(bool); requires {
		temp, _ := data["temp_token"].(string)
		if temp == "" {
			writeJSON(w, http.StatusBadGateway, map[string]string{"error": "2fa challenge missing"})
			return
		}
		pending, accepted := a.addPendingLogin(pendingLogin{TempToken: temp, Expires: a.now().Add(pendingLoginTTL), ClientIP: clientIP, Identity: in.Email})
		if !accepted {
			w.Header().Set("Retry-After", strconv.Itoa(int(pendingLoginTTL/time.Second)))
			writeJSON(w, http.StatusTooManyRequests, map[string]string{"error": "too many pending login challenges"})
			return
		}
		writeJSON(w, http.StatusOK, map[string]any{"requires_2fa": true, "pending_token": pending})
		return
	}
	a.finishLogin(w, r, data)
}

func (a *app) login2FA(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	var in struct {
		PendingToken string `json:"pending_token"`
		TOTPCode     string `json:"totp_code"`
	}
	if err := decodeJSON(r, &in, 1<<20); err != nil || in.PendingToken == "" || len(in.TOTPCode) != 6 {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid 2fa request"})
		return
	}
	a.mu.Lock()
	pending, ok := a.pending[in.PendingToken]
	delete(a.pending, in.PendingToken)
	a.mu.Unlock()
	if !ok || !a.now().Before(pending.Expires) {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "2fa session expired"})
		return
	}
	if pending.ClientIP != "" && pending.ClientIP != a.trustedClientIP(r) {
		writeJSON(w, http.StatusForbidden, map[string]string{"error": "2fa session binding failed"})
		return
	}
	if !a.allowLoginAttempt(r, "2fa:"+pending.Identity) {
		w.Header().Set("Retry-After", strconv.Itoa(int(loginWindow/time.Second)))
		writeJSON(w, http.StatusTooManyRequests, map[string]string{"error": "too many login attempts"})
		return
	}
	out, err := a.core.login2FA(r.Context(), map[string]string{"temp_token": pending.TempToken, "totp_code": in.TOTPCode}, requestID(r), a.trustedClientIP(r))
	if err != nil {
		a.coreError(w, err, "2fa verification failed")
		return
	}
	a.finishLogin(w, r, envelopeData(out))
}

func (a *app) finishLogin(w http.ResponseWriter, r *http.Request, data map[string]any) {
	access, _ := data["access_token"].(string)
	refresh, _ := data["refresh_token"].(string)
	if access == "" {
		writeJSON(w, http.StatusBadGateway, map[string]string{"error": "core token missing"})
		return
	}
	me, err := a.core.me(r.Context(), access, requestID(r))
	if err != nil {
		a.core.logout(r.Context(), refresh, requestID(r))
		writeJSON(w, http.StatusForbidden, map[string]string{"error": "admin verification failed"})
		return
	}
	user := envelopeData(me)
	if !isAdmin(user) {
		a.core.logout(r.Context(), refresh, requestID(r))
		writeJSON(w, http.StatusForbidden, map[string]string{"error": "admin role required"})
		return
	}
	now := a.now()
	s := session{AccessToken: access, RefreshToken: refresh, CSRFToken: token(16), User: publicUser(user), CreatedAt: now, LastSeen: now}
	id := token(32)
	a.mu.Lock()
	a.sessions[id] = s
	a.sessionLocks[id] = &sync.Mutex{}
	a.mu.Unlock()
	a.setCookie(w, id, int(defaultSessionMaxTTL/time.Second))
	writeJSON(w, http.StatusOK, map[string]any{"ok": true, "csrf_token": s.CSRFToken, "user": s.User})
}

func (a *app) removeSession(id string) {
	a.mu.Lock()
	delete(a.sessions, id)
	delete(a.sessionLocks, id)
	a.mu.Unlock()
}

func (a *app) logout(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if id, s, ok := a.sessionFromRequest(r); ok {
		if r.Header.Get("X-CSRF-Token") != s.CSRFToken {
			writeJSON(w, http.StatusForbidden, map[string]string{"error": "csrf validation failed"})
			return
		}
		a.removeSession(id)
		a.core.logout(r.Context(), s.RefreshToken, requestID(r))
	}
	a.setCookie(w, "", -1)
	writeJSON(w, http.StatusOK, map[string]bool{"ok": true})
}

func (a *app) refreshSession(ctx context.Context, id string, stale session) (session, bool) {
	a.mu.Lock()
	lock := a.sessionLocks[id]
	a.mu.Unlock()
	if lock == nil {
		return session{}, false
	}
	lock.Lock()
	defer lock.Unlock()
	a.mu.Lock()
	current, ok := a.sessions[id]
	a.mu.Unlock()
	if !ok {
		return session{}, false
	}
	if current.AccessToken != stale.AccessToken {
		return current, true
	}
	out, err := a.core.refresh(ctx, current.RefreshToken, token(12))
	if err != nil {
		return session{}, false
	}
	data := envelopeData(out)
	candidateRefresh := current.RefreshToken
	if next, _ := data["refresh_token"].(string); next != "" {
		candidateRefresh = next
	}
	access, _ := data["access_token"].(string)
	if access == "" {
		a.core.logout(ctx, candidateRefresh, token(12))
		return session{}, false
	}
	// Core may rotate the refresh token. Keep the candidate separate until the
	// replacement access token has been revalidated, so every token issued by a
	// successful refresh can be revoked on a validation failure.
	current.AccessToken = access
	me, err := a.core.me(ctx, access, token(12))
	if err != nil {
		a.core.logout(ctx, candidateRefresh, token(12))
		return session{}, false
	}
	current.User = publicUser(envelopeData(me))
	if !isAdmin(envelopeData(me)) {
		a.core.logout(ctx, candidateRefresh, token(12))
		return current, false
	}
	current.RefreshToken = candidateRefresh
	current.LastSeen = a.now()
	a.mu.Lock()
	a.sessions[id] = current
	a.mu.Unlock()
	return current, true
}

func (a *app) authenticate(w http.ResponseWriter, r *http.Request) (string, session, bool) {
	id, s, ok := a.sessionFromRequest(r)
	if !ok {
		a.setCookie(w, "", -1)
		writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "authentication required"})
		return "", session{}, false
	}
	if r.Method != http.MethodGet && r.Header.Get("X-CSRF-Token") != s.CSRFToken {
		writeJSON(w, http.StatusForbidden, map[string]string{"error": "csrf validation failed"})
		return "", session{}, false
	}
	if a.core == nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "core unavailable"})
		return "", session{}, false
	}
	me, err := a.core.me(r.Context(), s.AccessToken, requestID(r))
	if err != nil {
		if ce, ok := err.(*coreError); ok && ce.status == http.StatusUnauthorized && s.RefreshToken != "" {
			if next, refreshed := a.refreshSession(r.Context(), id, s); refreshed {
				return id, next, true
			} else if next.User != nil && !isAdmin(next.User) {
				a.removeSession(id)
				a.core.logout(r.Context(), s.RefreshToken, requestID(r))
				writeJSON(w, http.StatusForbidden, map[string]string{"error": "admin role required"})
				return "", session{}, false
			}
		}
		a.removeSession(id)
		a.core.logout(r.Context(), s.RefreshToken, requestID(r))
		a.setCookie(w, "", -1)
		if ce, ok := err.(*coreError); ok && ce.status == http.StatusUnauthorized {
			writeJSON(w, http.StatusUnauthorized, map[string]string{"error": "core session expired"})
		} else {
			a.coreError(w, err, "core session unavailable")
		}
		return "", session{}, false
	}
	user := envelopeData(me)
	if !isAdmin(user) {
		a.removeSession(id)
		a.core.logout(r.Context(), s.RefreshToken, requestID(r))
		writeJSON(w, http.StatusForbidden, map[string]string{"error": "admin role required"})
		return "", session{}, false
	}
	s.User = publicUser(user)
	a.mu.Lock()
	a.sessions[id] = s
	a.mu.Unlock()
	return id, s, true
}

func (a *app) me(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	_, s, ok := a.authenticate(w, r)
	if ok {
		writeJSON(w, http.StatusOK, map[string]any{"user": s.User, "csrf_token": s.CSRFToken, "plugin_id": pluginID, "plugin_version": pluginVersion})
	}
}

func (a *app) health(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"status": "ok", "plugin_id": pluginID, "version": pluginVersion})
}

func (a *app) ready(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if a.registry == nil || a.core == nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]any{"status": "not_ready"})
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"status": "ready", "plugin_id": pluginID, "version": pluginVersion})
}

func (a *app) apiPlugins(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if _, _, ok := a.authenticate(w, r); !ok {
		return
	}
	a.registry.mu.Lock()
	items := make([]map[string]any, 0, len(a.registry.data.Plugins))
	for _, p := range a.registry.data.Plugins {
		items = append(items, a.publicPlugin(p))
	}
	a.registry.mu.Unlock()
	sort.Slice(items, func(i, j int) bool { return items[i]["plugin_id"].(string) < items[j]["plugin_id"].(string) })
	writeJSON(w, http.StatusOK, map[string]any{"items": items})
}

func (a *app) marketplace(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if _, _, ok := a.authenticate(w, r); !ok {
		return
	}
	index, _, err := a.marketplaceConfig.loadIndex(r.Context())
	if err != nil {
		writeJSON(w, http.StatusBadGateway, map[string]string{"error": "marketplace is unavailable"})
		return
	}
	a.registry.mu.Lock()
	installed := make(map[string]pluginRecord, len(a.registry.data.Plugins))
	for id, plugin := range a.registry.data.Plugins {
		installed[id] = clonePluginRecord(plugin)
	}
	a.registry.mu.Unlock()
	items := make([]map[string]any, 0, len(index.Entries))
	coreVersion := a.currentCoreVersion(r.Context())
	for _, entry := range index.Entries {
		var plugin *pluginRecord
		if value, ok := installed[entry.PluginID]; ok {
			copy := value
			plugin = &copy
		}
		item := publicMarketplaceEntry(entry, plugin)
		compatibility := manifest.Manifest{CoreAPIBaseline: entry.CoreAPIBaseline, TestedCoreVersions: entry.TestedCoreVersions}.EvaluateCompatibility(coreVersion)
		item["compatibility"] = compatibility
		items = append(items, item)
	}
	writeJSON(w, http.StatusOK, map[string]any{
		"schema_version": index.SchemaVersion,
		"source":         index.Source,
		"issued_at":      index.IssuedAt,
		"expires_at":     index.ExpiresAt,
		"items":          items,
	})
}

func publicMarketplaceEntry(entry marketplaceEntry, installed *pluginRecord) map[string]any {
	item := map[string]any{
		"plugin_id":            entry.PluginID,
		"name":                 entry.Name,
		"version":              entry.Version,
		"description":          entry.Description,
		"publisher_key_id":     entry.PublisherKeyID,
		"core_api_baseline":    entry.CoreAPIBaseline,
		"tested_core_versions": entry.TestedCoreVersions,
		"capabilities":         entry.Capabilities,
		"archive_sha256":       entry.ArchiveSHA256,
		"archive_size":         entry.ArchiveSize,
		"release_notes":        entry.ReleaseNotes,
		"published_at":         entry.PublishedAt,
		"installed":            installed != nil,
		"installed_state":      "",
		"installed_status":     "",
		"installed_version":    "",
		"active_revision":      "",
	}
	if installed != nil {
		item["installed_state"] = installed.State
		item["installed_status"] = installationStatus(*installed)
		item["installed_version"] = installed.Manifest.Version
		item["active_revision"] = installed.ActiveRevision
	}
	return item
}

func (a *app) marketplaceInstall(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	raw, err := captureRequestBody(r, 32<<10)
	if err != nil {
		writeJSON(w, http.StatusRequestEntityTooLarge, map[string]string{"error": "request body exceeds size limit"})
		return
	}
	var input struct {
		PluginID string `json:"plugin_id"`
		Version  string `json:"version"`
	}
	decoder := json.NewDecoder(bytes.NewReader(raw))
	decoder.DisallowUnknownFields()
	if err := decoder.Decode(&input); err != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "plugin_id and version are required"})
		return
	}
	var trailing any
	if err := decoder.Decode(&trailing); err != io.EOF || !marketplaceIDPattern.MatchString(strings.TrimSpace(input.PluginID)) || !marketplaceVersionPattern.MatchString(marketplaceEntryVersion(marketplaceEntry{Version: input.Version})) {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "plugin_id and version are invalid"})
		return
	}
	input.PluginID = strings.TrimSpace(input.PluginID)
	input.Version = marketplaceEntryVersion(marketplaceEntry{Version: input.Version})
	r.Body = io.NopCloser(bytes.NewReader(raw))
	op, s, ok := a.mutationAuthWithHash(w, r, "marketplace_install", input.PluginID, operationHashWithBody(r, raw))
	if !ok {
		return
	}
	var installed pluginRecord
	if index, origin, loadErr := a.marketplaceConfig.loadIndex(r.Context()); loadErr != nil {
		err = loadErr
	} else {
		var entry *marketplaceEntry
		for i := range index.Entries {
			candidate := &index.Entries[i]
			if candidate.PluginID == input.PluginID && marketplaceEntryVersion(*candidate) == input.Version {
				entry = candidate
				break
			}
		}
		if entry == nil {
			err = errors.New("plugin version is not available in the marketplace")
		} else {
			a.registry.mu.Lock()
			installed, alreadyInstalled := a.registry.data.Plugins[input.PluginID]
			a.registry.mu.Unlock()
			if alreadyInstalled && compareMarketplaceVersions(entry.Version, installed.Manifest.Version) <= 0 {
				err = errors.New("marketplace version is not newer than the installed plugin")
			}
		}
		if err == nil {
			var archive []byte
			archive, err = a.marketplaceConfig.archiveBytes(r.Context(), *entry, origin)
			if err == nil {
				var info packageInfo
				info, err = a.inspectPackage(archive)
				if err == nil {
					if info.Manifest.PluginID != entry.PluginID || strings.TrimPrefix(info.Manifest.Version, "v") != input.Version {
						err = errors.New("marketplace package metadata does not match the catalog")
					} else if info.Manifest.Name != entry.Name || !sameCapabilities(info.Manifest.Capabilities, entry.Capabilities) {
						err = errors.New("marketplace package metadata does not match the catalog")
					} else if !sameCoreVersions(info.Manifest.TestedCoreVersions, entry.TestedCoreVersions) {
						err = errors.New("marketplace package Core test metadata does not match the catalog")
					} else if info.Manifest.Publisher.KeyID != entry.PublisherKeyID {
						err = errors.New("marketplace package publisher does not match the catalog")
					} else if strings.TrimPrefix(strings.TrimPrefix(info.Manifest.CoreAPIBaseline, "sub2api-"), "v") != strings.TrimPrefix(strings.TrimPrefix(entry.CoreAPIBaseline, "sub2api-"), "v") {
						err = errors.New("marketplace package Core baseline does not match the catalog")
					} else if compat := info.Manifest.EvaluateCompatibility(a.currentCoreVersion(r.Context())); !compat.Compatible {
						err = errors.New("marketplace package is incompatible with the current Core")
					}
				}
				if err == nil {
					installed, err = a.installPackage(info)
				}
			}
		}
	}
	if err == nil {
		op.Revision = installed.ActiveRevision
	}
	finished, persistErr := a.finalizeOperation(op, err, auditEvent{Time: time.Now().UTC(), Action: "marketplace_install", PluginID: input.PluginID, ActorID: s.User["id"], RequestID: requestID(r)})
	if persistErr != nil {
		writeOperationPersistenceError(w, finished)
		return
	}
	a.operationResponse(w, finished)
}

func (a *app) operationByID(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if _, _, ok := a.authenticate(w, r); !ok {
		return
	}
	id := strings.TrimPrefix(r.URL.Path, "/api/operations/")
	if id == "" || strings.ContainsAny(id, "/\\") {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid operation id"})
		return
	}
	a.registry.mu.Lock()
	defer a.registry.mu.Unlock()
	for _, op := range a.registry.data.Operations {
		if op.ID == id {
			writeJSON(w, http.StatusOK, op)
			return
		}
	}
	writeJSON(w, http.StatusNotFound, map[string]string{"error": "operation not found"})
}

func (a *app) publicPlugin(p pluginRecord) map[string]any {
	revisions := make([]map[string]any, 0, len(p.Revisions))
	for _, rev := range p.Revisions {
		revisions = append(revisions, map[string]any{"id": rev.ID, "version": rev.Version, "archive_sha256": rev.ArchiveSHA, "verified_at": rev.VerifiedAt, "healthy_at": rev.HealthyAt, "retired": rev.Retired})
	}
	compat := p.Manifest.EvaluateCompatibility(a.currentCoreVersion(context.Background()))
	return map[string]any{"plugin_id": p.Manifest.PluginID, "name": p.Manifest.Name, "version": p.Manifest.Version, "capabilities": p.Manifest.SortedCapabilities(), "state": p.State, "installation_status": installationStatus(p), "active_revision": p.ActiveRevision, "pending_revision": p.PendingRevision, "revisions": revisions, "compatibility": compat, "endpoint": p.Endpoint, "last_error": p.LastError, "updated_at": p.UpdatedAt, "menu": p.Manifest.UI.Menu}
}

func installationStatus(p pluginRecord) string {
	switch p.State {
	case "healthy", "enabled":
		return "installed"
	case "disabled":
		for _, revision := range p.Revisions {
			if !revision.HealthyAt.IsZero() {
				return "stopped"
			}
		}
		return "staged"
	case "incompatible":
		return "staged"
	case "starting", "draining", "upgrading", "rollback_pending":
		return "transitioning"
	default:
		return "failed"
	}
}

func (a *app) currentCoreVersion(ctx context.Context) string {
	if value := strings.TrimSpace(os.Getenv("CORE_VERSION")); value != "" {
		return value
	}
	if a.core == nil {
		return ""
	}
	out, err := a.core.publicSettings(ctx, token(12))
	if err != nil {
		return ""
	}
	data := envelopeData(out)
	if value, ok := data["version"].(string); ok {
		return strings.TrimSpace(value)
	}
	return ""
}

func (a *app) pluginIDFromPath(r *http.Request) (string, string, bool) {
	parts := strings.Split(strings.TrimPrefix(strings.Trim(r.URL.Path, "/"), "api/plugins/"), "/")
	if len(parts) < 1 || parts[0] == "" || strings.ContainsAny(parts[0], "/\\") || strings.Contains(parts[0], "..") {
		return "", "", false
	}
	action := ""
	if len(parts) > 1 {
		action = parts[1]
	}
	return parts[0], action, true
}

func (a *app) getPlugin(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if _, _, ok := a.authenticate(w, r); !ok {
		return
	}
	id, action, ok := a.pluginIDFromPath(r)
	if !ok || action != "" {
		writeJSON(w, http.StatusNotFound, map[string]string{"error": "plugin not found"})
		return
	}
	a.registry.mu.Lock()
	p, found := a.registry.data.Plugins[id]
	a.registry.mu.Unlock()
	if !found {
		writeJSON(w, http.StatusNotFound, map[string]string{"error": "plugin not found"})
		return
	}
	writeJSON(w, http.StatusOK, a.publicPlugin(p))
}

func (a *app) operationResponse(w http.ResponseWriter, op operation) {
	writeJSON(w, http.StatusAccepted, map[string]any{"operation_id": op.ID, "state": op.State, "error": op.Error, "warning": op.Warning})
}

func (a *app) finalizeOperation(op operation, operationErr error, event auditEvent) (operation, error) {
	finished, finishErr := a.registry.finishOperation(op, operationErr)
	if finishErr != nil {
		return finished, finishErr
	}
	event.Operation = finished.ID
	event.Result = finished.State
	auditErr := a.registry.addAudit(event)
	if auditErr != nil {
		return finished, auditErr
	}
	return finished, nil
}

func writeOperationPersistenceError(w http.ResponseWriter, op operation) {
	writeJSON(w, http.StatusInternalServerError, map[string]any{
		"operation_id": op.ID,
		"state":        op.State,
		"error":        "operation registry is unavailable",
	})
}

func (a *app) mutationAuth(w http.ResponseWriter, r *http.Request, kind, plugin string) (operation, session, bool) {
	body, err := captureRequestBody(r, maxOperationBodyBytes)
	if err != nil {
		writeJSON(w, http.StatusRequestEntityTooLarge, map[string]string{"error": "request body exceeds size limit"})
		return operation{}, session{}, false
	}
	return a.mutationAuthWithHash(w, r, kind, plugin, operationHashWithBody(r, body))
}

func (a *app) mutationAuthWithHash(w http.ResponseWriter, r *http.Request, kind, plugin, hash string) (operation, session, bool) {
	_, s, ok := a.authenticate(w, r)
	if !ok {
		return operation{}, session{}, false
	}
	key := strings.TrimSpace(r.Header.Get("Idempotency-Key"))
	if key == "" || len(key) > 128 {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "Idempotency-Key is required"})
		return operation{}, session{}, false
	}
	op, existing, conflict, err := a.registry.operation(kind, plugin, key, s.User["id"], requestID(r), hash)
	if err != nil {
		writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "operation registry is unavailable"})
		return operation{}, session{}, false
	}
	if conflict {
		writeJSON(w, http.StatusConflict, map[string]string{"error": "Idempotency-Key was already used for a different request"})
		return operation{}, session{}, false
	}
	if existing {
		a.operationResponse(w, op)
		return operation{}, session{}, false
	}
	return op, s, true
}

func operationHash(r *http.Request) string {
	return operationHashWithBody(r, nil)
}

func operationHashWithBody(r *http.Request, body []byte) string {
	if r == nil {
		return ""
	}
	bodySum := sha256.Sum256(body)
	value := r.Method + "\n" + r.URL.Path + "\n" + r.URL.RawQuery + "\n" + hex.EncodeToString(bodySum[:])
	sum := sha256.Sum256([]byte(value))
	return hex.EncodeToString(sum[:])
}

func (a *app) stageRevisionPaths(revisions []revision) ([]stagedRevisionPath, error) {
	base, err := filepath.Abs(filepath.Join(a.root, "installed"))
	if err != nil {
		return nil, err
	}
	moves := make([]stagedRevisionPath, 0, len(revisions))
	restore := func() {
		for i := len(moves) - 1; i >= 0; i-- {
			_ = os.Rename(moves[i].staged, moves[i].original)
		}
	}
	for _, rev := range revisions {
		if strings.TrimSpace(rev.Path) == "" {
			continue
		}
		original, err := filepath.Abs(rev.Path)
		if err != nil {
			restore()
			return nil, err
		}
		rel, err := filepath.Rel(base, original)
		if err != nil || rel == "." || rel == ".." || strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
			restore()
			return nil, errors.New("revision path is outside the plugin install root")
		}
		if _, err := os.Lstat(original); errors.Is(err, os.ErrNotExist) {
			continue
		} else if err != nil {
			restore()
			return nil, err
		}
		staged := original + ".uninstall-" + token(8)
		if err := os.Rename(original, staged); err != nil {
			restore()
			return nil, err
		}
		moves = append(moves, stagedRevisionPath{original: original, staged: staged})
	}
	return moves, nil
}

func restoreRevisionPaths(moves []stagedRevisionPath) error {
	var firstErr error
	for i := len(moves) - 1; i >= 0; i-- {
		if _, err := os.Lstat(moves[i].staged); errors.Is(err, os.ErrNotExist) {
			continue
		}
		if err := os.Rename(moves[i].staged, moves[i].original); err != nil && firstErr == nil {
			firstErr = err
		}
	}
	return firstErr
}

func removeStagedRevisionPaths(moves []stagedRevisionPath) error {
	var firstErr error
	for _, move := range moves {
		if err := os.RemoveAll(move.staged); err != nil && firstErr == nil {
			firstErr = err
		}
	}
	return firstErr
}

// captureRequestBody makes the server-side request fingerprint include the
// actual payload while restoring the body for the handler that still needs to
// decode it. The limit prevents an idempotency check from becoming an upload
// amplification vector.
func captureRequestBody(r *http.Request, limit int64) ([]byte, error) {
	if r == nil || r.Body == nil {
		return nil, nil
	}
	raw, err := io.ReadAll(io.LimitReader(r.Body, limit+1))
	_ = r.Body.Close()
	r.Body = io.NopCloser(bytes.NewReader(raw))
	if err != nil {
		return raw, err
	}
	if int64(len(raw)) > limit {
		return raw, errors.New("request body exceeds size limit")
	}
	return raw, nil
}

type packageInfo struct {
	Manifest manifest.Manifest
	Raw      []byte
	Archive  []byte
	Files    map[string][]byte
}

func (a *app) inspectPackage(raw []byte) (packageInfo, error) {
	if len(raw) == 0 || len(raw) > maxPackageBytes {
		return packageInfo{}, errors.New("package exceeds size limit")
	}
	hash := sha256.Sum256(raw)
	_ = hash
	zr, err := zip.NewReader(bytes.NewReader(raw), int64(len(raw)))
	if err != nil {
		return packageInfo{}, errors.New("invalid plugin package")
	}
	if len(zr.File) > maxPackageFiles {
		return packageInfo{}, errors.New("package contains too many files")
	}
	files := map[string][]byte{}
	var total int64
	for _, file := range zr.File {
		name := strings.ReplaceAll(file.Name, "\\", "/")
		if file.FileInfo().IsDir() {
			continue
		}
		if file.Mode()&os.ModeSymlink != 0 {
			return packageInfo{}, fmt.Errorf("symlink entries are not allowed: %s", file.Name)
		}
		if name == "" || strings.HasPrefix(name, "/") || strings.Contains(name, "..") || path.Clean(name) != name || strings.Contains(name, "\\") {
			return packageInfo{}, fmt.Errorf("unsafe package path: %s", file.Name)
		}
		if _, exists := files[name]; exists {
			return packageInfo{}, fmt.Errorf("duplicate package path: %s", name)
		}
		if file.UncompressedSize64 > maxUncompressedBytes {
			return packageInfo{}, errors.New("package member exceeds size limit")
		}
		rc, err := file.Open()
		if err != nil {
			return packageInfo{}, err
		}
		remaining := maxUncompressedBytes - total
		if remaining <= 0 {
			_ = rc.Close()
			return packageInfo{}, errors.New("package exceeds uncompressed size limit")
		}
		data, readErr := io.ReadAll(io.LimitReader(rc, remaining+1))
		_ = rc.Close()
		if readErr != nil {
			return packageInfo{}, readErr
		}
		total += int64(len(data))
		if int64(len(data)) > remaining || total > maxUncompressedBytes {
			return packageInfo{}, errors.New("package exceeds uncompressed size limit")
		}
		files[name] = data
	}
	manifestRaw, ok := files["manifest.json"]
	if !ok {
		return packageInfo{}, errors.New("manifest.json is required")
	}
	manifestPath := filepath.Join(os.TempDir(), "plugin-manifest-"+token(8)+".json")
	defer os.Remove(manifestPath)
	if err := os.WriteFile(manifestPath, manifestRaw, 0o600); err != nil {
		return packageInfo{}, err
	}
	m, _, err := manifest.Load(manifestPath)
	if err != nil {
		return packageInfo{}, err
	}
	if signature, ok := files["signature.json"]; ok {
		pub, trusted := a.trustedPublishers[m.Publisher.KeyID]
		if !trusted {
			return packageInfo{}, errors.New("plugin publisher is not trusted")
		}
		if err := manifest.VerifyKeyID(signature, m.Publisher.KeyID); err != nil {
			return packageInfo{}, err
		}
		if err := manifest.VerifySignature(manifestRaw, signature, []byte(base64.StdEncoding.EncodeToString(pub))); err != nil {
			return packageInfo{}, err
		}
	} else if !a.allowUnsigned {
		return packageInfo{}, errors.New("signed plugin package is required")
	}
	for name, expected := range m.Files {
		data, exists := files[name]
		if !exists {
			return packageInfo{}, fmt.Errorf("manifest file is missing: %s", name)
		}
		sum := sha256.Sum256(data)
		if hex.EncodeToString(sum[:]) != expected {
			return packageInfo{}, fmt.Errorf("file hash mismatch: %s", name)
		}
	}
	for name := range files {
		if name == "manifest.json" || name == "signature.json" {
			continue
		}
		if _, declared := m.Files[name]; !declared {
			return packageInfo{}, fmt.Errorf("package file is not declared in manifest: %s", name)
		}
	}
	if len(m.Files) == 0 {
		return packageInfo{}, errors.New("manifest.files must declare package files")
	}
	if _, ok := m.Files[m.UI.Entrypoint]; !ok {
		entry := strings.Trim(strings.TrimSpace(m.UI.Entrypoint), "/")
		if entry == "admin" || entry == "admin/index.html" {
			if _, ok := m.Files["ui/index.html"]; !ok {
				return packageInfo{}, errors.New("ui entrypoint requires ui/index.html")
			}
		} else {
			return packageInfo{}, errors.New("ui.entrypoint is missing from files")
		}
	}
	if m.Backend.Command != "" {
		if _, ok := m.Files[m.Backend.Command]; !ok {
			return packageInfo{}, errors.New("backend.command is missing from files")
		}
	}
	return packageInfo{Manifest: m, Raw: manifestRaw, Archive: raw, Files: files}, nil
}

func (a *app) installPackage(info packageInfo) (pluginRecord, error) {
	unlock := a.lockPlugin(info.Manifest.PluginID)
	defer unlock()
	return a.installPackageMode(info, false)
}

func (a *app) installPackageMode(info packageInfo, preserveActive bool) (pluginRecord, error) {
	m := info.Manifest
	compat := m.EvaluateCompatibility(a.currentCoreVersion(context.Background()))
	state := "disabled"
	if compat.Status == "incompatible" {
		state = "incompatible"
	} else if compat.Status == "untested" {
		state = "disabled"
	}
	archiveHash := sha256.Sum256(info.Archive)
	revisionID := time.Now().UTC().Format("20060102T150405.000000000Z") + "-" + hex.EncodeToString(archiveHash[:4])
	dir := filepath.Join(a.root, "installed", m.PluginID, revisionID)
	staging := dir + ".staging-" + token(8)
	if err := os.MkdirAll(staging, 0o700); err != nil {
		return pluginRecord{}, err
	}
	committed := false
	defer func() {
		if !committed {
			_ = os.RemoveAll(staging)
		}
	}()
	for name, data := range info.Files {
		dest := filepath.Join(staging, filepath.FromSlash(name))
		if !strings.HasPrefix(filepath.Clean(dest), filepath.Clean(staging)+string(os.PathSeparator)) {
			return pluginRecord{}, errors.New("package path escaped staging directory")
		}
		if err := os.MkdirAll(filepath.Dir(dest), 0o700); err != nil {
			return pluginRecord{}, err
		}
		mode := os.FileMode(0o600)
		if strings.HasPrefix(name, "service/") {
			mode = 0o700
		}
		if err := os.WriteFile(dest, data, mode); err != nil {
			return pluginRecord{}, err
		}
	}
	if err := os.WriteFile(filepath.Join(staging, ".verified"), []byte(revisionID+"\n"), 0o600); err != nil {
		return pluginRecord{}, err
	}
	if err := os.MkdirAll(filepath.Dir(dir), 0o700); err != nil {
		return pluginRecord{}, err
	}
	if err := os.Rename(staging, dir); err != nil {
		return pluginRecord{}, err
	}
	committed = true
	p := pluginRecord{Manifest: m, State: state, ActiveRevision: revisionID, Revisions: []revision{{ID: revisionID, Version: m.Version, Path: dir, ArchiveSHA: hex.EncodeToString(archiveHash[:]), Manifest: m, VerifiedAt: time.Now().UTC()}}, UpdatedAt: time.Now().UTC()}
	a.registry.mu.Lock()
	old, existed := a.registry.data.Plugins[m.PluginID]
	if existed {
		old = clonePluginRecord(old)
	}
	if existed {
		if !preserveActive {
			a.registry.mu.Unlock()
			_ = os.RemoveAll(dir)
			return pluginRecord{}, errors.New("plugin is already installed; use upgrade")
		}
		for i := range old.Revisions {
			if old.Revisions[i].Manifest.PluginID == "" {
				old.Revisions[i].Manifest = old.Manifest
			}
		}
		p.Revisions = append(old.Revisions, p.Revisions...)
		if preserveActive {
			p.Manifest = old.Manifest
			p.ActiveRevision = old.ActiveRevision
			p.PendingRevision = revisionID
			p.PreviousState = old.State
			p.State = "upgrading"
		} else {
			p.ActiveRevision = revisionID
		}
		// An endpoint belongs to a service mode. A command revision gets a new
		// managed port; an external revision must be configured explicitly when
		// switching from a command revision.
		if old.Manifest.Backend.Command == "" && m.Backend.Command == "" {
			p.Endpoint = old.Endpoint
		}
		p.ConfigCipher = old.ConfigCipher
		if preserveActive {
			p.LastError = ""
		}
	}
	a.registry.data.Plugins[m.PluginID] = p
	err := a.registry.saveLocked()
	if err != nil {
		if existed {
			a.registry.data.Plugins[m.PluginID] = old
		} else {
			delete(a.registry.data.Plugins, m.PluginID)
		}
		if restoreErr := a.registry.saveLocked(); restoreErr != nil {
			err = fmt.Errorf("registry save failed: %v; restore failed: %w", err, restoreErr)
		}
	}
	a.registry.mu.Unlock()
	if err != nil {
		_ = os.RemoveAll(dir)
		return pluginRecord{}, err
	}
	return p, nil
}

func readUpload(r *http.Request) ([]byte, error) {
	if strings.HasPrefix(strings.ToLower(r.Header.Get("Content-Type")), "multipart/form-data") {
		if err := r.ParseMultipartForm(maxPackageBytes); err != nil {
			return nil, err
		}
		file, _, err := r.FormFile("package")
		if err != nil {
			file, _, err = r.FormFile("artifact")
		}
		if err != nil {
			return nil, errors.New("multipart field package is required")
		}
		defer file.Close()
		return io.ReadAll(io.LimitReader(file, maxPackageBytes+1))
	}
	return io.ReadAll(io.LimitReader(r.Body, maxPackageBytes+1))
}

func (a *app) install(w http.ResponseWriter, r *http.Request, upgrade bool, routeID string) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	expectedID := strings.TrimSpace(routeID)
	operationKind := map[bool]string{false: "install", true: "upgrade"}[upgrade]
	raw, err := readUpload(r)
	if err == nil && len(raw) > maxPackageBytes {
		err = errors.New("package exceeds size limit")
	}
	op, s, ok := a.mutationAuthWithHash(w, r, operationKind, expectedID, operationHashWithBody(r, raw))
	if !ok {
		return
	}
	var unlock func()
	if upgrade && expectedID != "" {
		unlock = a.lockPlugin(expectedID)
		defer unlock()
	}
	var p pluginRecord
	previousState := "disabled"
	var oldRecord pluginRecord
	var oldExists bool
	if upgrade && expectedID != "" {
		a.registry.mu.Lock()
		if old, exists := a.registry.data.Plugins[expectedID]; exists && old.State != "" {
			previousState = old.State
			oldRecord = clonePluginRecord(old)
			oldExists = true
		} else {
			err = errors.New("plugin to upgrade was not found")
		}
		a.registry.mu.Unlock()
	}
	if err == nil {
		info, inspectErr := a.inspectPackage(raw)
		err = inspectErr
		if err == nil && expectedID != "" && info.Manifest.PluginID != expectedID {
			err = errors.New("upgrade plugin_id does not match route")
		}
		if err == nil && expectedID == "" {
			if setErr := a.registry.setOperationPlugin(op.ID, info.Manifest.PluginID); setErr != nil {
				err = setErr
			}
		}
		if err == nil {
			if upgrade {
				p, err = a.installPackageMode(info, true)
				if err == nil {
					candidate := p
					candidate.ActiveRevision = p.PendingRevision
					candidateRevision := revisionByID(&p, p.PendingRevision)
					candidate.Manifest = candidateRevision.Manifest
					candidateKey := p.Manifest.PluginID + "#" + p.PendingRevision
					candidateEndpoint, probeErr := a.startRevision(&candidate, p.PendingRevision, candidateKey)
					err = probeErr
					if err == nil {
						if previousState != "healthy" {
							a.stopProcess(candidateKey)
						}
						if previousState == "healthy" {
							p.Endpoint = candidateEndpoint
						}
						p.Manifest = candidateRevision.Manifest
						p.ActiveRevision = p.PendingRevision
						p.PendingRevision = ""
						p.PreviousState = ""
						p.State = previousState
						if p.State == "upgrading" || p.State == "starting" || p.State == "draining" {
							p.State = "disabled"
						}
						p.LastError = ""
						a.registry.mu.Lock()
						p.UpdatedAt = time.Now().UTC()
						a.registry.data.Plugins[p.Manifest.PluginID] = p
						saveErr := a.registry.saveLocked()
						if saveErr != nil {
							if oldExists {
								a.registry.data.Plugins[p.Manifest.PluginID] = oldRecord
							} else {
								delete(a.registry.data.Plugins, p.Manifest.PluginID)
							}
							if restoreErr := a.registry.saveLocked(); restoreErr != nil {
								saveErr = fmt.Errorf("registry save failed: %v; restore failed: %w", saveErr, restoreErr)
							}
						}
						a.registry.mu.Unlock()
						err = saveErr
						if err != nil {
							a.stopProcess(candidateKey)
						} else if previousState == "healthy" {
							// Keep the old process alive until the registry commit has
							// succeeded, then atomically switch the process handle.
							a.stopPlugin(p.Manifest.PluginID)
							a.promoteProcess(candidateKey, p.Manifest.PluginID)
						}
					} else {
						p.State = "rollback_pending"
						p.LastError = sanitizeError(err)
						a.registry.mu.Lock()
						a.registry.data.Plugins[p.Manifest.PluginID] = p
						saveErr := a.registry.saveLocked()
						if saveErr != nil {
							if oldExists {
								a.registry.data.Plugins[p.Manifest.PluginID] = oldRecord
							} else {
								delete(a.registry.data.Plugins, p.Manifest.PluginID)
							}
							restoreErr := a.registry.saveLocked()
							err = fmt.Errorf("candidate probe failed: %v; registry save failed: %v", err, saveErr)
							if restoreErr != nil {
								err = fmt.Errorf("%v; restore failed: %w", err, restoreErr)
							}
						}
						a.registry.mu.Unlock()
					}
				}
			} else {
				if unlock == nil {
					unlock = a.lockPlugin(info.Manifest.PluginID)
					defer unlock()
				}
				p, err = a.installPackageMode(info, false)
			}
		}
	}
	if err == nil {
		op.Revision = p.ActiveRevision
	}
	pluginAuditID := p.Manifest.PluginID
	if pluginAuditID == "" {
		pluginAuditID = expectedID
	}
	op, persistErr := a.finalizeOperation(op, err, auditEvent{Time: time.Now().UTC(), Action: op.Kind, PluginID: pluginAuditID, ActorID: s.User["id"], RequestID: requestID(r)})
	if persistErr != nil {
		writeOperationPersistenceError(w, op)
		return
	}
	a.operationResponse(w, op)
}

func (a *app) removeOwnMenu(ctx context.Context, access, id string, rid string) error {
	if a.core == nil {
		return errors.New("core unavailable")
	}
	settings, err := a.core.settings(ctx, access, rid)
	if err != nil {
		return err
	}
	data := envelopeData(settings)
	raw := menuItemsFromSettings(data)
	ids := coreMenuIDSet(id)
	next := make([]any, 0, len(raw))
	for _, item := range raw {
		if menuItemHasID(item, ids) {
			continue
		}
		next = append(next, item)
	}
	if len(next) == len(raw) {
		return nil
	}
	_, err = a.core.updateMenu(ctx, access, rid, next)
	return err
}

func (a *app) restoreOwnMenu(ctx context.Context, access string, p pluginRecord, rid string) error {
	if a.core == nil {
		return errors.New("core unavailable")
	}
	itemURL, err := a.menuURL(p)
	if err != nil {
		return err
	}
	coreID, err := coreMenuID(p.Manifest.UI.Menu.ID)
	if err != nil {
		return err
	}
	settings, err := a.core.settings(ctx, access, rid)
	if err != nil {
		return err
	}
	current := menuItemsFromSettings(envelopeData(settings))
	candidate := map[string]any{"id": coreID, "label": p.Manifest.UI.Menu.Label, "url": itemURL, "visibility": "admin", "sort_order": p.Manifest.UI.Menu.SortOrder}
	ids := coreMenuIDSet(p.Manifest.UI.Menu.ID)
	replaced := false
	for i, raw := range current {
		if menuItemHasID(raw, ids) {
			current[i] = candidate
			replaced = true
		}
	}
	if !replaced {
		current = append(current, candidate)
	}
	_, err = a.core.updateMenu(ctx, access, rid, current)
	return err
}

// menuURL resolves the URL that Core should place in custom_menu_items. The
// subscription module is deliberately different from a generic plugin: its
// browser entry must always land in the Plugin Admin Shell, where the shared
// administrator session and module route are enforced. Its own service URL is
// an internal health/BFF dependency and must never become a second login entry.
func (a *app) menuURL(p pluginRecord) (string, error) {
	if p.Manifest.PluginID == subscriptionPluginID {
		base := strings.TrimRight(strings.TrimSpace(a.publicURL), "/")
		if base == "" {
			return "", errors.New("PLUGIN_PUBLIC_URL is required for the subscription menu")
		}
		if err := validatePublicURL(base); err != nil {
			return "", err
		}
		return base + "/admin/#/modules/subscription/overview", nil
	}
	itemURL := strings.TrimSpace(p.Manifest.UI.Menu.URL)
	if itemURL == "" {
		cfg, err := a.decryptConfig(p.ConfigCipher)
		if err != nil {
			return "", err
		}
		itemURL, _ = cfg["public_url"].(string)
		itemURL = strings.TrimSpace(itemURL)
	}
	if itemURL == "" || validateMenuURL(itemURL) != nil {
		return "", errors.New("menu URL is not configured")
	}
	return itemURL, nil
}

func (a *app) withPlugin(w http.ResponseWriter, r *http.Request, kind string, fn func(*pluginRecord, session) error) {
	id, _, ok := a.pluginIDFromPath(r)
	if !ok {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid plugin id"})
		return
	}
	op, s, ok := a.mutationAuth(w, r, kind, id)
	if !ok {
		return
	}
	unlock := a.lockPlugin(id)
	defer unlock()
	a.registry.mu.Lock()
	p, found := a.registry.data.Plugins[id]
	a.registry.mu.Unlock()
	if found {
		p = clonePluginRecord(p)
	}
	old := clonePluginRecord(p)
	var err error
	var warning string
	if !found {
		err = errors.New("plugin not found")
	} else {
		err = fn(&p, s)
	}
	if err == nil && kind != "uninstall" {
		a.registry.mu.Lock()
		p.UpdatedAt = time.Now().UTC()
		a.registry.data.Plugins[id] = p
		saveErr := a.registry.saveLocked()
		if saveErr != nil {
			a.registry.data.Plugins[id] = old
			if restoreErr := a.registry.saveLocked(); restoreErr != nil {
				saveErr = fmt.Errorf("registry save failed: %v; restore failed: %w", saveErr, restoreErr)
			}
		}
		a.registry.mu.Unlock()
		err = saveErr
		if err != nil {
			a.restorePluginRuntime(old, p)
			if kind == "disable" {
				_ = a.restoreOwnMenu(r.Context(), s.AccessToken, old, requestID(r))
			}
		}
	} else if err == nil && kind == "uninstall" {
		// Move revision directories to private tombstones before changing the
		// registry. This keeps both the registry and files recoverable if either
		// the rename or registry commit fails.
		moves, stageErr := a.stageRevisionPaths(old.Revisions)
		err = stageErr
		if err == nil {
			a.registry.mu.Lock()
			delete(a.registry.data.Plugins, id)
			saveErr := a.registry.saveLocked()
			if saveErr != nil {
				a.registry.data.Plugins[id] = old
				if restoreErr := a.registry.saveLocked(); restoreErr != nil {
					saveErr = fmt.Errorf("registry save failed: %v; restore failed: %w", saveErr, restoreErr)
				}
			}
			a.registry.mu.Unlock()
			err = saveErr
			if err != nil {
				if restoreErr := restoreRevisionPaths(moves); restoreErr != nil {
					err = fmt.Errorf("%v; revision restore failed: %w", err, restoreErr)
				}
				_ = a.restoreOwnMenu(r.Context(), s.AccessToken, old, requestID(r))
			} else if cleanupErr := removeStagedRevisionPaths(moves); cleanupErr != nil {
				// The registry commit is already complete. Report a warning while
				// keeping the deletion completed; a later startup pass removes the
				// private tombstones without requiring a second uninstall operation.
				warning = sanitizeError(fmt.Errorf("plugin files remain pending cleanup: %w", cleanupErr))
			}
		} else {
			_ = a.restoreOwnMenu(r.Context(), s.AccessToken, old, requestID(r))
		}
	}
	op.Warning = warning
	op, persistErr := a.finalizeOperation(op, err, auditEvent{Time: time.Now().UTC(), Action: kind, PluginID: id, ActorID: s.User["id"], RequestID: requestID(r)})
	if persistErr != nil {
		writeOperationPersistenceError(w, op)
		return
	}
	a.operationResponse(w, op)
}

func (a *app) restorePluginRuntime(old, current pluginRecord) {
	if current.State == "healthy" && old.State != "healthy" {
		a.stopPlugin(current.Manifest.PluginID)
		return
	}
	if current.State != "healthy" && old.State == "healthy" {
		a.stopPlugin(current.Manifest.PluginID)
		candidate := old
		if err := a.startPlugin(&candidate); err == nil {
			return
		}
	}
	if current.State == "healthy" && old.State == "healthy" && current.ActiveRevision != old.ActiveRevision {
		a.stopPlugin(current.Manifest.PluginID)
		candidate := old
		_ = a.startPlugin(&candidate)
	}
}

func (a *app) enable(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	a.withPlugin(w, r, "enable", func(p *pluginRecord, _ session) error {
		compat := p.Manifest.EvaluateCompatibility(a.currentCoreVersion(r.Context()))
		if !compat.Compatible {
			p.State = "incompatible"
			return errors.New("plugin is incompatible with current Core")
		}
		if compat.Status == "untested" && r.URL.Query().Get("accept_untested") != "true" {
			return errors.New("untested Core version requires explicit acceptance")
		}
		p.State = "starting"
		if err := a.startPlugin(p); err != nil {
			a.stopPlugin(p.Manifest.PluginID)
			p.State = "error"
			p.LastError = sanitizeError(err)
			return err
		}
		p.State = "healthy"
		p.LastError = ""
		for i := range p.Revisions {
			if p.Revisions[i].ID == p.ActiveRevision {
				p.Revisions[i].HealthyAt = time.Now().UTC()
			}
		}
		return nil
	})
}

func (a *app) disable(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	a.withPlugin(w, r, "disable", func(p *pluginRecord, s session) error {
		if err := a.removeOwnMenu(r.Context(), s.AccessToken, p.Manifest.UI.Menu.ID, requestID(r)); err != nil {
			return err
		}
		p.State = "draining"
		a.stopPlugin(p.Manifest.PluginID)
		p.State = "disabled"
		return nil
	})
}

// decodeRollbackRequest keeps the API compatible with the old empty-body
// rollback (used to discard a failed pending candidate), while making an
// explicitly selected revision authoritative and strictly validated.
func decodeRollbackRequest(r *http.Request) (string, error) {
	if r == nil || r.Body == nil {
		return "", nil
	}
	raw, err := io.ReadAll(io.LimitReader(r.Body, 64<<10))
	if err != nil {
		return "", errors.New("invalid rollback request")
	}
	if len(bytes.TrimSpace(raw)) == 0 {
		return "", nil
	}
	decoder := json.NewDecoder(bytes.NewReader(raw))
	decoder.DisallowUnknownFields()
	var input struct {
		Revision string `json:"revision"`
	}
	if err := decoder.Decode(&input); err != nil {
		return "", errors.New("rollback revision is invalid")
	}
	var trailing any
	if err := decoder.Decode(&trailing); err != io.EOF {
		return "", errors.New("rollback request must contain one JSON value")
	}
	input.Revision = strings.TrimSpace(input.Revision)
	if input.Revision == "" || len(input.Revision) > 160 || strings.ContainsAny(input.Revision, "/\\") {
		return "", errors.New("rollback revision is required")
	}
	return input.Revision, nil
}

func (a *app) rollback(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	a.withPlugin(w, r, "rollback", func(p *pluginRecord, _ session) error {
		requestedRevision, err := decodeRollbackRequest(r)
		if err != nil {
			return err
		}
		targetState := p.State
		if p.PreviousState != "" {
			targetState = p.PreviousState
		}
		current := p.ActiveRevision
		pendingID := p.PendingRevision
		var target revision
		hasTarget := false
		if requestedRevision != "" {
			for _, candidate := range p.Revisions {
				if candidate.ID != requestedRevision {
					continue
				}
				if candidate.Retired {
					return errors.New("rollback revision is retired")
				}
				if candidate.ID == current {
					return errors.New("rollback revision is already active")
				}
				if candidate.ID == pendingID {
					return errors.New("rollback revision is still pending")
				}
				target = candidate
				if target.Manifest.PluginID == "" {
					target.Manifest = p.Manifest
				}
				hasTarget = true
				break
			}
			if !hasTarget {
				return errors.New("rollback revision not found")
			}
		}
		// A failed upgrade leaves the previous active revision untouched and
		// stores the new revision as pending. Rolling back in that state means
		// discarding the failed candidate, not attempting to boot it again. When
		// the caller names an older revision, discard the candidate first and then
		// continue with the explicitly selected target.
		if pendingID != "" && current != "" {
			if targetState == "healthy" {
				if err := a.checkPluginHealth(p); err != nil {
					p.LastError = sanitizeError(err)
					return err
				}
			}
			kept := p.Revisions[:0]
			for i := range p.Revisions {
				if p.Revisions[i].ID == pendingID {
					// Keep the candidate until a maintenance pass can remove its
					// files after this registry update has committed.
					p.Revisions[i].Retired = true
				}
				kept = append(kept, p.Revisions[i])
			}
			p.Revisions = kept
			p.PendingRevision = ""
			p.PreviousState = ""
			if requestedRevision == "" {
				p.State = targetState
				if p.State == "starting" || p.State == "draining" || p.State == "upgrading" || p.State == "rollback_pending" {
					p.State = "disabled"
				}
				p.LastError = ""
				return nil
			}
		}
		if !hasTarget && len(p.Revisions) < 2 {
			p.State = "disabled"
			return errors.New("no rollback revision retained")
		}
		if !hasTarget {
			for i := len(p.Revisions) - 1; i >= 0; i-- {
				if p.Revisions[i].Retired || p.Revisions[i].ID == current || (p.PendingRevision != "" && p.Revisions[i].ID == p.PendingRevision) {
					continue
				}
				target = p.Revisions[i]
				if target.Manifest.PluginID == "" {
					target.Manifest = p.Manifest
				}
				hasTarget = true
				break
			}
		}
		if !hasTarget {
			return errors.New("rollback revision not found")
		}
		candidate := *p
		candidate.Manifest = target.Manifest
		candidate.ActiveRevision = target.ID
		candidateKey := p.Manifest.PluginID + "#rollback"
		endpoint, err := a.startRevision(&candidate, target.ID, candidateKey)
		if err != nil {
			p.State = "rollback_pending"
			p.LastError = sanitizeError(err)
			return err
		}
		if targetState == "healthy" {
			a.stopPlugin(p.Manifest.PluginID)
			a.promoteProcess(candidateKey, p.Manifest.PluginID)
			p.Endpoint = endpoint
		} else {
			a.stopProcess(candidateKey)
		}
		p.ActiveRevision = target.ID
		p.Manifest = target.Manifest
		p.PendingRevision = ""
		p.PreviousState = ""
		p.State = targetState
		if p.State == "starting" || p.State == "draining" || p.State == "upgrading" || p.State == "rollback_pending" {
			p.State = "disabled"
		}
		p.LastError = ""
		return nil
	})
}

func (a *app) uninstall(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodPost && r.Method != http.MethodDelete {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	a.withPlugin(w, r, "uninstall", func(p *pluginRecord, s session) error {
		if p.State == "healthy" || p.State == "starting" || p.State == "draining" {
			return errors.New("disable plugin before uninstall")
		}
		if err := a.removeOwnMenu(r.Context(), s.AccessToken, p.Manifest.UI.Menu.ID, requestID(r)); err != nil {
			return err
		}
		a.stopPlugin(p.Manifest.PluginID)
		return nil
	})
}

func (a *app) config(w http.ResponseWriter, r *http.Request) {
	id, action, ok := a.pluginIDFromPath(r)
	if !ok || action != "config" {
		writeJSON(w, http.StatusNotFound, map[string]string{"error": "not found"})
		return
	}
	if r.Method == http.MethodGet {
		if _, _, ok := a.authenticate(w, r); !ok {
			return
		}
		a.registry.mu.Lock()
		p, found := a.registry.data.Plugins[id]
		a.registry.mu.Unlock()
		if !found {
			writeJSON(w, http.StatusNotFound, map[string]string{"error": "plugin not found"})
			return
		}
		cfg, cfgErr := a.decryptConfig(p.ConfigCipher)
		if cfgErr != nil {
			writeJSON(w, http.StatusInternalServerError, map[string]string{"error": "plugin configuration is unavailable"})
			return
		}
		public := map[string]any{}
		for key, value := range cfg {
			if isSecretKey(key) {
				public[key] = map[string]any{"configured": strings.TrimSpace(fmt.Sprint(value)) != ""}
				continue
			}
			public[key] = value
		}
		writeJSON(w, http.StatusOK, map[string]any{"config": public, "endpoint": p.Endpoint})
		return
	}
	if r.Method != http.MethodPut {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	a.withPlugin(w, r, "config", func(p *pluginRecord, _ session) error {
		var cfg map[string]any
		if err := decodeJSON(r, &cfg, maxJSONBytes); err != nil || cfg == nil {
			return errors.New("config must be a JSON object")
		}
		for key := range cfg {
			normalized := strings.ReplaceAll(strings.ReplaceAll(strings.ToLower(strings.TrimSpace(key)), "-", "_"), " ", "_")
			if strings.Contains(normalized, "core_token") || strings.Contains(normalized, "core_access_token") || strings.Contains(normalized, "core_refresh_token") || strings.Contains(normalized, "admin_key") || strings.Contains(normalized, "admin_api_key") {
				return errors.New("credential field is not accepted")
			}
		}
		cipherText, err := a.encryptConfig(cfg)
		if err != nil {
			return err
		}
		p.ConfigCipher = cipherText
		if p.Manifest.Backend.Command == "" {
			endpoint, ok := cfg["service_url"].(string)
			if !ok || strings.TrimSpace(endpoint) == "" {
				return errors.New("service_url is required for external plugins")
			}
			if err := validateServiceURL(endpoint); err != nil {
				return err
			}
			endpoint = strings.TrimRight(strings.TrimSpace(endpoint), "/")
			if p.State == "healthy" && endpoint != p.Endpoint {
				return errors.New("disable plugin before changing service_url")
			}
			p.Endpoint = endpoint
		} else {
			// Managed command plugins receive their endpoint from the supervisor.
			p.Endpoint = ""
		}
		return nil
	})
}

func isSecretKey(key string) bool {
	lower := strings.ToLower(strings.ReplaceAll(strings.ReplaceAll(strings.TrimSpace(key), "-", "_"), " ", "_"))
	compact := strings.ReplaceAll(lower, "_", "")
	for _, marker := range []string{"secret", "password", "token", "apikey", "privatekey", "credential", "authorization", "cookie", "session", "key"} {
		if strings.Contains(compact, marker) {
			return true
		}
	}
	return false
}

func (a *app) cipherKey() []byte {
	if len(a.configKey) == 32 {
		return a.configKey
	}
	return nil
}

func (a *app) encryptConfig(value map[string]any) (string, error) {
	if len(a.cipherKey()) != 32 {
		return "", errors.New("PLUGIN_CONFIG_KEY is required")
	}
	plain, err := json.Marshal(value)
	if err != nil {
		return "", err
	}
	block, err := aes.NewCipher(a.cipherKey())
	if err != nil {
		return "", err
	}
	gcm, err := cipher.NewGCM(block)
	if err != nil {
		return "", err
	}
	nonce := make([]byte, gcm.NonceSize())
	if _, err := rand.Read(nonce); err != nil {
		return "", err
	}
	return base64.RawStdEncoding.EncodeToString(gcm.Seal(nonce, nonce, plain, nil)), nil
}

func (a *app) decryptConfig(encoded string) (map[string]any, error) {
	if encoded == "" {
		return map[string]any{}, nil
	}
	raw, err := base64.RawStdEncoding.DecodeString(encoded)
	if err != nil {
		return nil, err
	}
	if len(a.cipherKey()) != 32 {
		return nil, errors.New("PLUGIN_CONFIG_KEY is required")
	}
	block, err := aes.NewCipher(a.cipherKey())
	if err != nil {
		return nil, err
	}
	gcm, err := cipher.NewGCM(block)
	if err != nil {
		return nil, err
	}
	if len(raw) < gcm.NonceSize() {
		return nil, errors.New("invalid encrypted config")
	}
	plain, err := gcm.Open(nil, raw[:gcm.NonceSize()], raw[gcm.NonceSize():], nil)
	if err != nil {
		return nil, err
	}
	var out map[string]any
	if err := json.Unmarshal(plain, &out); err != nil {
		return nil, err
	}
	return out, nil
}

func validateServiceURL(raw string) error {
	u, err := url.Parse(strings.TrimSpace(raw))
	if err != nil || u.Host == "" || (u.Scheme != "http" && u.Scheme != "https") || u.User != nil || u.RawQuery != "" || u.Fragment != "" {
		return errors.New("service_url must be an absolute http(s) origin without credentials or query")
	}
	if !isLoopbackHost(u.Hostname()) {
		return errors.New("service_url must point to a loopback plugin service")
	}
	return nil
}

func validateMenuURL(raw string) error {
	u, err := url.Parse(strings.TrimSpace(raw))
	if err != nil || u.Host == "" || (u.Scheme != "http" && u.Scheme != "https") || u.User != nil || u.RawQuery != "" || u.Fragment != "" {
		return errors.New("menu URL must be an absolute http(s) origin")
	}
	if u.Scheme == "http" && !isLoopbackHost(u.Hostname()) {
		return errors.New("menu URL must use HTTPS unless loopback")
	}
	return nil
}

// validatePublicURL accepts the externally reachable base URL of Plugin Admin.
// It intentionally has no query, fragment, credentials, or path traversal;
// menuURL appends the one fixed module fragment after validation.
func validatePublicURL(raw string) error {
	u, err := url.Parse(strings.TrimSpace(raw))
	if err != nil || u.Host == "" || (u.Scheme != "http" && u.Scheme != "https") || u.User != nil || u.RawQuery != "" || u.Fragment != "" {
		return errors.New("PLUGIN_PUBLIC_URL must be an absolute http(s) URL without credentials, query or fragment")
	}
	if u.Scheme == "http" && !isLoopbackHost(u.Hostname()) {
		return errors.New("PLUGIN_PUBLIC_URL must use HTTPS unless loopback")
	}
	if strings.Contains(u.Path, "\\") || strings.Contains(u.Path, "..") {
		return errors.New("PLUGIN_PUBLIC_URL contains an unsafe path")
	}
	return nil
}

func (a *app) startPlugin(p *pluginRecord) error {
	endpoint, err := a.startRevision(p, p.ActiveRevision, p.Manifest.PluginID)
	if err != nil {
		return err
	}
	p.Endpoint = endpoint
	return nil
}

func (a *app) startRevision(p *pluginRecord, revisionID, processKey string) (string, error) {
	if revisionID == "" {
		return "", errors.New("revision is required")
	}
	rev := revisionByID(p, revisionID)
	pluginManifest := p.Manifest
	if rev.Manifest.PluginID != "" {
		pluginManifest = rev.Manifest
	}
	endpoint := ""
	if pluginManifest.Backend.Command != "" {
		commandPath := filepath.Join(a.root, "installed", pluginManifest.PluginID, revisionID, filepath.FromSlash(pluginManifest.Backend.Command))
		if rev.Path != "" {
			commandPath = filepath.Join(rev.Path, filepath.FromSlash(pluginManifest.Backend.Command))
		}
		if _, err := os.Stat(commandPath); err != nil {
			return "", err
		}
		port, err := freeLoopbackPort()
		if err != nil {
			return "", err
		}
		cmd := exec.Command(commandPath)
		cmd.Dir = filepath.Dir(commandPath)
		cmd.Env = []string{"PATH=/usr/bin:/bin", "HOME=" + filepath.Dir(commandPath), "LANG=C", "PLUGIN_ID=" + pluginManifest.PluginID, pluginManifest.Backend.ListenEnv + "=" + port}
		cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
		if err := cmd.Start(); err != nil {
			return "", err
		}
		endpoint = "http://127.0.0.1:" + port
		a.mu.Lock()
		a.processes[processKey] = cmd
		a.mu.Unlock()
	} else {
		// External services are owned by their deployer. Never inherit a
		// command-process endpoint or a stale endpoint across a mode switch.
		endpoint = p.Endpoint
	}
	probe := *p
	probe.Manifest = pluginManifest
	probe.ActiveRevision = revisionID
	probe.Endpoint = endpoint
	var probeErr error
	attempts := 1
	probeDelay := 50 * time.Millisecond
	var startupDeadline time.Time
	if pluginManifest.Backend.Command != "" {
		// A freshly spawned interpreter-backed process can need several seconds
		// before binding its port (notably on macOS under concurrent test load).
		// Keep the window bounded while avoiding a fixed one-second flake.
		attempts = 100
		startupDeadline = time.Now().Add(5 * time.Second)
	}
	for attempt := 0; attempt < attempts; attempt++ {
		if !startupDeadline.IsZero() && time.Now().After(startupDeadline) {
			break
		}
		probeErr = a.checkPluginHealth(&probe)
		if probeErr == nil {
			break
		}
		if attempt+1 < attempts && (startupDeadline.IsZero() || time.Now().Add(probeDelay).Before(startupDeadline)) {
			time.Sleep(probeDelay)
		}
	}
	if probeErr != nil {
		a.stopProcess(processKey)
		return "", probeErr
	}
	return endpoint, nil
}

func revisionByID(p *pluginRecord, id string) revision {
	for _, rev := range p.Revisions {
		if rev.ID == id {
			if rev.Manifest.PluginID == "" {
				rev.Manifest = p.Manifest
			}
			return rev
		}
	}
	return revision{ID: id, Manifest: p.Manifest}
}

func freeLoopbackPort() (string, error) {
	listener, err := net.Listen("tcp", "127.0.0.1:0")
	if err != nil {
		return "", err
	}
	port := strconv.Itoa(listener.Addr().(*net.TCPAddr).Port)
	if err := listener.Close(); err != nil {
		return "", err
	}
	return port, nil
}

func (a *app) checkPluginHealth(p *pluginRecord) error {
	if p.Endpoint == "" {
		return errors.New("service_url is required before enabling")
	}
	u, err := url.Parse(p.Endpoint)
	if err != nil {
		return err
	}
	if err := validateServiceURL(p.Endpoint); err != nil {
		return err
	}
	health := strings.TrimRight(p.Endpoint, "/") + "/" + strings.Trim(strings.TrimSpace(p.Manifest.Backend.HealthPath), "/")
	req, err := http.NewRequest(http.MethodGet, health, nil)
	if err != nil {
		return err
	}
	ctx, cancel := context.WithTimeout(context.Background(), 5*time.Second)
	defer cancel()
	req = req.WithContext(ctx)
	client := &http.Client{Timeout: 5 * time.Second, Transport: &http.Transport{Proxy: nil}, CheckRedirect: func(_ *http.Request, _ []*http.Request) error { return http.ErrUseLastResponse }}
	res, err := client.Do(req)
	if err != nil {
		return err
	}
	defer res.Body.Close()
	body, err := io.ReadAll(io.LimitReader(res.Body, 64<<10))
	if err != nil {
		return err
	}
	_ = u
	if res.StatusCode < 200 || res.StatusCode >= 300 {
		return fmt.Errorf("plugin health check returned %d", res.StatusCode)
	}
	if version := responseVersion(body); version != "" && strings.TrimPrefix(version, "v") != strings.TrimPrefix(p.Manifest.Version, "v") {
		return fmt.Errorf("plugin version mismatch: got %s", version)
	}
	ready := strings.TrimRight(p.Endpoint, "/") + "/" + strings.Trim(strings.TrimSpace(p.Manifest.Backend.ReadinessPath), "/")
	readyReq, err := http.NewRequestWithContext(ctx, http.MethodGet, ready, nil)
	if err != nil {
		return err
	}
	readyRes, err := client.Do(readyReq)
	if err != nil {
		return err
	}
	defer readyRes.Body.Close()
	if readyRes.StatusCode < 200 || readyRes.StatusCode >= 300 {
		return fmt.Errorf("plugin readiness check returned %d", readyRes.StatusCode)
	}
	return nil
}

func responseVersion(body []byte) string {
	var value map[string]any
	if json.Unmarshal(body, &value) != nil {
		return ""
	}
	version, _ := value["version"].(string)
	return strings.TrimSpace(version)
}

func (a *app) stopPlugin(id string) {
	a.stopProcess(id)
}

func (a *app) stopProcess(id string) {
	a.mu.Lock()
	cmd := a.processes[id]
	delete(a.processes, id)
	a.mu.Unlock()
	if cmd != nil && cmd.Process != nil {
		// Kill the process group so a plugin cannot leave a child server behind
		// after disable, upgrade, rollback or control-plane shutdown.
		if err := syscall.Kill(-cmd.Process.Pid, syscall.SIGTERM); err != nil {
			_ = cmd.Process.Signal(syscall.SIGTERM)
		}
		finished := make(chan struct{})
		go func() { _, _ = cmd.Process.Wait(); close(finished) }()
		select {
		case <-finished:
		case <-time.After(10 * time.Second):
			_ = cmd.Process.Kill()
			<-finished
		}
	}
}

func (a *app) shutdown() {
	a.mu.Lock()
	ids := make([]string, 0, len(a.processes))
	for id := range a.processes {
		ids = append(ids, id)
	}
	a.mu.Unlock()
	for _, id := range ids {
		a.stopProcess(id)
	}
}

func (a *app) promoteProcess(from, to string) {
	a.mu.Lock()
	if cmd, ok := a.processes[from]; ok {
		a.processes[to] = cmd
		delete(a.processes, from)
	}
	a.mu.Unlock()
}

// recoverPlugins reconciles persisted lifecycle state with the processes and
// external endpoints that exist after a control-plane restart. A healthy
// command plugin is started again; an external plugin is only probed. Any
// interrupted transition is failed closed instead of being advertised as
// healthy with no corresponding runtime.
func (a *app) recoverPlugins() error {
	a.registry.mu.Lock()
	// A prior delete may have committed the registry before the filesystem
	// cleanup failed. Remove only tombstones whose original revision is no
	// longer referenced; an interrupted delete still needs its tombstone to
	// recover the registry record safely.
	_ = a.cleanupUninstallTombstonesLocked()
	ids := make([]string, 0, len(a.registry.data.Plugins))
	for id := range a.registry.data.Plugins {
		ids = append(ids, id)
	}
	a.registry.mu.Unlock()
	sort.Strings(ids)
	for _, id := range ids {
		unlock := a.lockPlugin(id)
		a.registry.mu.Lock()
		p, ok := a.registry.data.Plugins[id]
		a.registry.mu.Unlock()
		if !ok {
			unlock()
			continue
		}
		old := clonePluginRecord(p)
		var err error
		switch p.State {
		case "healthy", "enabled":
			compat := p.Manifest.EvaluateCompatibility(a.currentCoreVersion(context.Background()))
			if !compat.Compatible {
				err = errors.New("plugin is incompatible with current Core")
			} else if p.ActiveRevision == "" {
				err = errors.New("active revision is missing")
			} else {
				candidate := p
				endpoint, probeErr := a.startRevision(&candidate, p.ActiveRevision, p.Manifest.PluginID)
				err = probeErr
				if err == nil {
					p.Endpoint = endpoint
					p.State = "healthy"
					p.LastError = ""
					for i := range p.Revisions {
						if p.Revisions[i].ID == p.ActiveRevision {
							p.Revisions[i].HealthyAt = time.Now().UTC()
						}
					}
				}
			}
			if err != nil {
				p.State = "error"
				p.LastError = sanitizeError(err)
				p.Endpoint = ""
			}
		case "starting", "draining", "upgrading", "rollback_pending":
			a.stopPlugin(p.Manifest.PluginID)
			p.State = "error"
			p.LastError = "control-plane restart interrupted plugin operation"
		default:
			unlock()
			continue
		}
		p.UpdatedAt = time.Now().UTC()
		a.registry.mu.Lock()
		a.registry.data.Plugins[id] = p
		saveErr := a.registry.saveLocked()
		if saveErr != nil {
			a.registry.data.Plugins[id] = old
			if restoreErr := a.registry.saveLocked(); restoreErr != nil {
				saveErr = fmt.Errorf("registry save failed: %v; restore failed: %w", saveErr, restoreErr)
			}
		}
		a.registry.mu.Unlock()
		unlock()
		if saveErr != nil {
			if p.Manifest.Backend.Command != "" {
				a.stopPlugin(p.Manifest.PluginID)
			}
			return saveErr
		}
		// Retired payloads are intentionally kept through the current operation
		// commit so a failed registry write remains recoverable. Once recovery has
		// persisted the authoritative record, clean those unreferenced payloads.
		_ = a.cleanupRetiredRevisions(p)
	}
	return nil
}

func (a *app) cleanupUninstallTombstonesLocked() error {
	live := map[string]struct{}{}
	for _, plugin := range a.registry.data.Plugins {
		for _, revision := range plugin.Revisions {
			if revision.Path == "" {
				continue
			}
			if absolute, err := filepath.Abs(revision.Path); err == nil {
				live[filepath.Clean(absolute)] = struct{}{}
			}
		}
	}
	installedRoot := filepath.Join(a.root, "installed")
	pluginDirs, err := os.ReadDir(installedRoot)
	if errors.Is(err, os.ErrNotExist) {
		return nil
	}
	if err != nil {
		return err
	}
	var firstErr error
	for _, pluginDir := range pluginDirs {
		if !pluginDir.IsDir() {
			continue
		}
		entries, readErr := os.ReadDir(filepath.Join(installedRoot, pluginDir.Name()))
		if readErr != nil {
			if firstErr == nil {
				firstErr = readErr
			}
			continue
		}
		for _, entry := range entries {
			if !entry.IsDir() || !strings.Contains(entry.Name(), ".uninstall-") {
				continue
			}
			originalName := strings.SplitN(entry.Name(), ".uninstall-", 2)[0]
			originalPath, pathErr := filepath.Abs(filepath.Join(installedRoot, pluginDir.Name(), originalName))
			if pathErr == nil {
				if _, referenced := live[filepath.Clean(originalPath)]; referenced {
					if _, statErr := os.Lstat(originalPath); errors.Is(statErr, os.ErrNotExist) {
						if restoreErr := os.Rename(filepath.Join(installedRoot, pluginDir.Name(), entry.Name()), originalPath); restoreErr != nil && firstErr == nil {
							firstErr = restoreErr
						}
					} else if statErr == nil {
						if removeErr := os.RemoveAll(filepath.Join(installedRoot, pluginDir.Name(), entry.Name())); removeErr != nil && firstErr == nil {
							firstErr = removeErr
						}
					}
					continue
				}
			}
			if removeErr := os.RemoveAll(filepath.Join(installedRoot, pluginDir.Name(), entry.Name())); removeErr != nil && firstErr == nil {
				firstErr = removeErr
			}
		}
	}
	return firstErr
}

// cleanupRetiredRevisions removes files for revisions that are no longer
// eligible for activation. Metadata is retained in the registry for audit and
// history, but retired payloads must not accumulate indefinitely on disk.
func (a *app) cleanupRetiredRevisions(p pluginRecord) error {
	base, err := filepath.Abs(filepath.Join(a.root, "installed"))
	if err != nil {
		return err
	}
	var firstErr error
	for _, rev := range p.Revisions {
		if !rev.Retired || rev.Path == "" || rev.ID == p.ActiveRevision || rev.ID == p.PendingRevision {
			continue
		}
		absolute, pathErr := filepath.Abs(rev.Path)
		if pathErr != nil {
			if firstErr == nil {
				firstErr = pathErr
			}
			continue
		}
		rel, relErr := filepath.Rel(base, absolute)
		if relErr != nil || rel == "." || rel == ".." || strings.HasPrefix(rel, ".."+string(os.PathSeparator)) {
			if firstErr == nil {
				firstErr = errors.New("retired revision path is outside the plugin install root")
			}
			continue
		}
		if removeErr := os.RemoveAll(absolute); removeErr != nil && firstErr == nil {
			firstErr = removeErr
		}
	}
	return firstErr
}

func (a *app) audit(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if _, _, ok := a.authenticate(w, r); !ok {
		return
	}
	a.registry.mu.Lock()
	items := append([]auditEvent(nil), a.registry.data.Audit...)
	a.registry.mu.Unlock()
	writeJSON(w, http.StatusOK, map[string]any{"items": items})
}

// subscriptionStatus exposes module health without creating a second session.
// The browser receives only derived state; Core credentials remain in session.
func (a *app) subscriptionStatus(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	_, s, ok := a.authenticate(w, r)
	if !ok {
		return
	}
	enabled := a.subscriptionEnabled()
	writeJSON(w, http.StatusOK, map[string]any{
		"module":               "subscription",
		"enabled":              enabled,
		"core_base_configured": a.core != nil,
		"session_mode":         "shared",
		"credential_state":     "server_managed",
		"operator":             s.User,
	})
}

// captchaConfig exposes only the public browser-side fields required to render
// the Core login challenge. Provider secrets and the rest of Core settings
// never cross this boundary. The endpoint is intentionally unauthenticated so
// the first Plugin Admin login can discover whether a proof is required.
func (a *app) captchaConfig(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if a.core == nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "core unavailable"})
		return
	}
	out, err := a.core.publicSettings(r.Context(), requestID(r))
	if err != nil {
		a.coreError(w, err, "core settings unavailable")
		return
	}
	data := envelopeData(out)
	boolValue := func(key string) bool {
		value, _ := data[key].(bool)
		return value
	}
	stringValue := func(key string) string {
		value, _ := data[key].(string)
		value = strings.TrimSpace(value)
		if len(value) > 512 {
			return ""
		}
		return value
	}
	turnstileEnabled := boolValue("turnstile_enabled")
	tencentEnabled := boolValue("tencent_captcha_enabled")
	aliyunEnabled := boolValue("aliyun_captcha_enabled")
	provider := ""
	switch {
	case turnstileEnabled:
		provider = "turnstile"
	case tencentEnabled:
		provider = "tencent"
	case aliyunEnabled:
		provider = "aliyun"
	}
	writeJSON(w, http.StatusOK, map[string]any{
		"enabled":                 turnstileEnabled || tencentEnabled || aliyunEnabled,
		"provider":                provider,
		"turnstile_enabled":       turnstileEnabled,
		"turnstile_site_key":      stringValue("turnstile_site_key"),
		"tencent_captcha_enabled": tencentEnabled,
		"tencent_captcha_app_id":  stringValue("tencent_captcha_app_id"),
		"tencent_captcha_region":  stringValue("tencent_captcha_region"),
		"aliyun_captcha_enabled":  aliyunEnabled,
		"aliyun_captcha_scene_id": stringValue("aliyun_captcha_scene_id"),
		"aliyun_captcha_prefix":   stringValue("aliyun_captcha_prefix"),
		"aliyun_captcha_region":   stringValue("aliyun_captcha_region"),
	})
}

// subscriptionEnabled is the server-side source of truth for the optional
// subscription module. UI visibility is only a convenience; every module BFF
// endpoint calls requireSubscriptionEnabled so a stale/deep-linked browser
// cannot read Core subscription data after the module is disabled.
func (a *app) subscriptionEnabled() bool {
	if a == nil || a.registry == nil {
		return false
	}
	a.registry.mu.Lock()
	defer a.registry.mu.Unlock()
	plugin, found := a.registry.data.Plugins[subscriptionPluginID]
	return found && (plugin.State == "healthy" || plugin.State == "enabled")
}

func (a *app) requireSubscriptionEnabled(w http.ResponseWriter) bool {
	if a.subscriptionEnabled() {
		return true
	}
	// Do not reveal whether the module was ever installed. The control plane
	// still exposes /api/subscription/status to authenticated admins so the UI
	// can render an accurate disabled state.
	writeJSON(w, http.StatusNotFound, map[string]string{"error": "subscription module is not enabled"})
	return false
}

func (a *app) subscriptionAudit(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if _, _, ok := a.authenticate(w, r); !ok {
		return
	}
	if !a.requireSubscriptionEnabled(w) {
		return
	}
	if a.registry == nil {
		writeJSON(w, http.StatusOK, map[string]any{"items": []auditEvent{}})
		return
	}
	a.registry.mu.Lock()
	items := make([]auditEvent, 0)
	for _, item := range a.registry.data.Audit {
		if strings.HasPrefix(item.Action, "subscription") || strings.Contains(item.Action, "/api/v1/admin/subscriptions") || strings.Contains(item.Action, "/api/v1/admin/payment/plans") || strings.Contains(item.Action, "/api/v1/admin/users/") {
			items = append(items, item)
		}
	}
	a.registry.mu.Unlock()
	writeJSON(w, http.StatusOK, map[string]any{"items": items})
}

func sanitizedCoreValue(value any) any {
	switch typed := value.(type) {
	case []any:
		out := make([]any, 0, len(typed))
		for _, item := range typed {
			out = append(out, sanitizedCoreValue(item))
		}
		return out
	case map[string]any:
		out := make(map[string]any, len(typed))
		for key, item := range typed {
			if isSecretKey(key) {
				continue
			}
			out[key] = sanitizedCoreValue(item)
		}
		return out
	default:
		return value
	}
}

func (a *app) writeSubscriptionEnvelope(w http.ResponseWriter, envelope coreEnvelope) {
	var data any
	if len(envelope.Data) > 0 {
		if json.Unmarshal(envelope.Data, &data) != nil {
			writeJSON(w, http.StatusBadGateway, map[string]string{"error": "invalid Core response"})
			return
		}
	}
	status := envelope.status
	if status == 0 {
		status = http.StatusOK
	}
	writeJSON(w, status, map[string]any{"code": envelope.Code, "message": envelope.Message, "data": sanitizedCoreValue(data)})
}

func (a *app) subscriptionProxy(w http.ResponseWriter, r *http.Request) {
	if r.Method != http.MethodGet {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	if !validSubscriptionQuery(r.URL.Query()) {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid query parameters"})
		return
	}
	if a.core == nil {
		writeJSON(w, http.StatusServiceUnavailable, map[string]string{"error": "core unavailable"})
		return
	}
	_, s, ok := a.authenticate(w, r)
	if !ok {
		return
	}
	if !a.requireSubscriptionEnabled(w) {
		return
	}
	var corePath string
	pathName := strings.TrimSuffix(r.URL.Path, "/")
	switch {
	case pathName == "/api/subscription/plans":
		corePath = "/api/v1/admin/payment/plans"
	case pathName == "/api/subscription/subscriptions":
		corePath = "/api/v1/admin/subscriptions"
	case strings.HasPrefix(pathName, "/api/subscription/subscriptions/"):
		id := strings.TrimPrefix(pathName, "/api/subscription/subscriptions/")
		if !positiveID(id) {
			writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid subscription id"})
			return
		}
		corePath = "/api/v1/admin/subscriptions/" + id
	case strings.HasPrefix(pathName, "/api/subscription/users/"):
		rest := strings.TrimPrefix(pathName, "/api/subscription/users/")
		parts := strings.Split(rest, "/")
		if len(parts) == 1 && positiveID(parts[0]) {
			corePath = "/api/v1/admin/users/" + parts[0]
		} else if len(parts) == 2 && parts[1] == "subscriptions" && positiveID(parts[0]) {
			corePath = "/api/v1/admin/users/" + parts[0] + "/subscriptions"
		} else {
			writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid user path"})
			return
		}
	default:
		writeJSON(w, http.StatusNotFound, map[string]string{"error": "subscription endpoint not found"})
		return
	}
	// authenticate() has already revalidated the Core access token. A failed
	// read is intentionally returned as a generic gateway error to avoid leaking
	// Core response details.
	out, err := a.core.read(r.Context(), corePath+querySuffix(r.URL.Query()), s.AccessToken, requestID(r))
	if err != nil {
		a.coreError(w, err, "subscription data unavailable")
		return
	}
	if a.registry != nil {
		_ = a.registry.addAudit(auditEvent{Time: time.Now().UTC(), Action: "read:" + corePath, PluginID: "qiu.subscription-admin", ActorID: s.User["id"], RequestID: requestID(r)})
	}
	a.writeSubscriptionEnvelope(w, out)
}

func querySuffix(values url.Values) string {
	if len(values) == 0 {
		return ""
	}
	return "?" + sanitizeSubscriptionQuery(values).Encode()
}

func (a *app) menu(w http.ResponseWriter, r *http.Request, apply bool) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	id, _, ok := a.pluginIDFromPath(r)
	if !ok {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid plugin id"})
		return
	}
	kind := "menu_preview"
	if apply {
		kind = "menu_apply"
	}
	op, s, ok := a.mutationAuth(w, r, kind, id)
	if !ok {
		return
	}
	unlock := a.lockPlugin(id)
	defer unlock()
	a.registry.mu.Lock()
	p, found := a.registry.data.Plugins[id]
	a.registry.mu.Unlock()
	var err error
	var current []any
	if !found {
		err = errors.New("plugin not found")
	}
	if err == nil && apply && (p.State != "healthy" && p.State != "enabled") {
		err = errors.New("plugin must be healthy before menu injection")
	}
	if err == nil {
		settings, callErr := a.core.settings(r.Context(), s.AccessToken, requestID(r))
		if callErr != nil {
			err = callErr
		} else {
			data := envelopeData(settings)
			current = menuItemsFromSettings(data)
		}
	}
	coreID := ""
	if err == nil {
		coreID, err = coreMenuID(p.Manifest.UI.Menu.ID)
	}
	itemURL := ""
	if err == nil {
		itemURL, err = a.menuURL(p)
	}
	next := append([]any(nil), current...)
	if err == nil {
		candidate := map[string]any{"id": coreID, "label": p.Manifest.UI.Menu.Label, "url": itemURL, "visibility": "admin", "sort_order": p.Manifest.UI.Menu.SortOrder}
		ids := coreMenuIDSet(p.Manifest.UI.Menu.ID)
		replaced := false
		for i, raw := range next {
			if menuItemHasID(raw, ids) {
				next[i] = candidate
				replaced = true
			}
		}
		if !replaced {
			next = append(next, candidate)
		}
	}
	if apply && err == nil {
		_, err = a.core.updateMenu(r.Context(), s.AccessToken, requestID(r), next)
	}
	op, persistErr := a.finalizeOperation(op, err, auditEvent{Time: time.Now().UTC(), Action: kind, PluginID: id, ActorID: s.User["id"], RequestID: requestID(r)})
	if persistErr != nil {
		writeOperationPersistenceError(w, op)
		return
	}
	if apply {
		a.operationResponse(w, op)
		return
	}
	writeJSON(w, http.StatusOK, map[string]any{"operation_id": op.ID, "current": current, "next": next, "state": op.State, "error": op.Error})
}

func (a *app) menuGlobal(w http.ResponseWriter, r *http.Request, apply bool) {
	if r.Method != http.MethodPost {
		writeJSON(w, http.StatusMethodNotAllowed, map[string]string{"error": "method not allowed"})
		return
	}
	var input struct {
		PluginID string `json:"plugin_id"`
	}
	raw, bodyErr := captureRequestBody(r, 32<<10)
	if bodyErr != nil {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "invalid request body"})
		return
	}
	dec := json.NewDecoder(bytes.NewReader(raw))
	dec.DisallowUnknownFields()
	var trailing any
	if err := dec.Decode(&input); err != nil || dec.Decode(&trailing) != io.EOF || strings.TrimSpace(input.PluginID) == "" || strings.ContainsAny(input.PluginID, "/\\") {
		writeJSON(w, http.StatusBadRequest, map[string]string{"error": "plugin_id is required"})
		return
	}
	// a.menu performs its own authenticated idempotency check and needs the
	// original body available for its server-side request fingerprint.
	r.Body = io.NopCloser(bytes.NewReader(raw))
	pathAction := "menu-preview"
	if apply {
		pathAction = "menu-apply"
	}
	r.URL.Path = "/api/plugins/" + input.PluginID + "/" + pathAction
	a.menu(w, r, apply)
}

func (a *app) coreError(w http.ResponseWriter, err error, fallback string) {
	status := http.StatusBadGateway
	if ce, ok := err.(*coreError); ok && ce.status >= 400 && ce.status < 600 {
		status = ce.status
	}
	writeJSON(w, status, map[string]string{"error": fallback})
}

func staticMounts(base string) []string {
	base = strings.TrimRight(strings.TrimSpace(base), "/")
	mounts := []string{"/admin"}
	if base != "" && base != "/" {
		// Vue's relative ../ asset URLs resolve one level above /admin/.
		// Keep that parent prefix as an asset alias for mounted deployments.
		mounts = append(mounts, base+"/admin", base)
	}
	return mounts
}

// staticPath returns the path beneath a recognised UI mount. It rejects
// traversal before cleaning so encoded dot segments cannot escape ui/.
func staticPath(a *app, requestPath string) (string, bool, bool) {
	escaped := requestPath
	if escaped == "" {
		escaped = "/"
	}
	decoded, err := url.PathUnescape(escaped)
	if err != nil || strings.Contains(decoded, "\\") {
		return "", false, true
	}
	for _, segment := range strings.Split(decoded, "/") {
		if segment == "." || segment == ".." {
			return "", false, true
		}
	}
	clean := path.Clean("/" + decoded)
	if clean == "/" {
		return "", true, false
	}
	// The default shell references app.js/styles.css from the parent of
	// /admin/. Vite builds commonly place additional files under /assets/.
	if clean == "/app.js" || clean == "/styles.css" || strings.HasPrefix(clean, "/assets/") {
		return strings.TrimPrefix(clean, "/"), true, false
	}
	for _, mount := range staticMounts(a.publicBasePath) {
		if clean == mount || strings.HasPrefix(clean, mount+"/") {
			rel := strings.TrimPrefix(clean, mount)
			return strings.TrimPrefix(rel, "/"), true, false
		}
	}
	return "", false, false
}

func (a *app) writeIndex(w http.ResponseWriter) {
	data, err := uiFS.ReadFile("ui/index.html")
	if err != nil {
		http.Error(w, "ui unavailable", http.StatusInternalServerError)
		return
	}
	baseJSON, _ := json.Marshal(a.publicBasePath)
	content := strings.ReplaceAll(string(data), "__PLUGIN_BASE_PATH_JSON__", string(baseJSON))
	// The Vue shell stores the mount in a meta attribute. Escape it as HTML so
	// an operator-provided base path cannot break the document or inject markup.
	content = strings.ReplaceAll(content, "__PLUGIN_BASE_PATH__", html.EscapeString(a.publicBasePath))
	data = []byte(content)
	w.Header().Set("Cache-Control", "no-store")
	w.Header().Set("Content-Type", "text/html; charset=utf-8")
	_, _ = w.Write(data)
}

func (a *app) static(w http.ResponseWriter, r *http.Request) {
	rel, mounted, rejected := staticPath(a, r.URL.EscapedPath())
	if rejected {
		http.NotFound(w, r)
		return
	}
	if !mounted {
		http.NotFound(w, r)
		return
	}
	if rel == "" {
		if r.URL.Path == "/admin" || (a.publicBasePath != "" && r.URL.Path == strings.TrimRight(a.publicBasePath, "/")+"/admin") {
			http.Redirect(w, r, strings.TrimRight(a.publicBasePath, "/")+"/admin/", http.StatusPermanentRedirect)
			return
		}
		a.writeIndex(w)
		return
	}
	data, err := uiFS.ReadFile("ui/" + rel)
	if err == nil {
		contentType := mime.TypeByExtension(path.Ext(rel))
		if contentType == "" {
			contentType = http.DetectContentType(data)
		}
		w.Header().Set("Content-Type", contentType)
		_, _ = w.Write(data)
		return
	}
	// Hash-routed SPA paths are client-side routes and have no file extension.
	if path.Ext(rel) == "" {
		a.writeIndex(w)
		return
	}
	http.NotFound(w, r)
}

func (a *app) routes() http.Handler {
	mux := http.NewServeMux()
	mux.HandleFunc("/healthz", a.health)
	mux.HandleFunc("/readyz", a.ready)
	mux.HandleFunc("/login", a.login)
	mux.HandleFunc("/login/2fa", a.login2FA)
	mux.HandleFunc("/logout", a.logout)
	mux.HandleFunc("/api/captcha-config", a.captchaConfig)
	mux.HandleFunc("/api/me", a.me)
	mux.HandleFunc("/api/audit", a.audit)
	mux.HandleFunc("/api/subscription/status", a.subscriptionStatus)
	mux.HandleFunc("/api/subscription/audit", a.subscriptionAudit)
	mux.HandleFunc("/api/subscription/plans", a.subscriptionProxy)
	mux.HandleFunc("/api/subscription/subscriptions", a.subscriptionProxy)
	mux.HandleFunc("/api/subscription/subscriptions/", a.subscriptionProxy)
	mux.HandleFunc("/api/subscription/users/", a.subscriptionProxy)
	mux.HandleFunc("/api/marketplace", a.marketplace)
	mux.HandleFunc("/api/marketplace/install", a.marketplaceInstall)
	mux.HandleFunc("/api/menu-items/preview", func(w http.ResponseWriter, r *http.Request) { a.menuGlobal(w, r, false) })
	mux.HandleFunc("/api/menu-items/apply", func(w http.ResponseWriter, r *http.Request) { a.menuGlobal(w, r, true) })
	mux.HandleFunc("/api/operations/", a.operationByID)
	mux.HandleFunc("/api/plugins", a.apiPlugins)
	mux.HandleFunc("/api/plugins/install", func(w http.ResponseWriter, r *http.Request) { a.install(w, r, false, "") })
	mux.HandleFunc("/api/plugins/", func(w http.ResponseWriter, r *http.Request) {
		id, action, ok := a.pluginIDFromPath(r)
		if !ok {
			http.NotFound(w, r)
			return
		}
		if action == "" {
			if r.Method == http.MethodDelete {
				a.uninstall(w, r)
			} else {
				a.getPlugin(w, r)
			}
			return
		}
		switch action {
		case "install":
			a.install(w, r, false, id)
		case "upgrade":
			a.install(w, r, true, id)
		case "enable":
			a.enable(w, r)
		case "disable":
			a.disable(w, r)
		case "rollback":
			a.rollback(w, r)
		case "uninstall":
			a.uninstall(w, r)
		case "delete":
			a.uninstall(w, r)
		case "config":
			a.config(w, r)
		case "menu-preview":
			a.menu(w, r, false)
		case "menu-apply":
			a.menu(w, r, true)
		default:
			http.NotFound(w, r)
		}
	})
	mux.HandleFunc("/", a.static)
	handler := a.securityHeaders(requestIDMiddleware(mux))
	base := strings.TrimRight(strings.TrimSpace(a.publicBasePath), "/")
	if base == "" || base == "/" {
		return handler
	}
	// Reverse proxies normally strip PLUGIN_PUBLIC_BASE_PATH. Stripping the
	// exact configured prefix here as well keeps direct local previews and
	// mounted production deployments behaviorally identical without exposing a
	// generic path proxy.
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path == base || strings.HasPrefix(r.URL.Path, base+"/") {
			clone := r.Clone(r.Context())
			clone.URL.Path = strings.TrimPrefix(r.URL.Path, base)
			if clone.URL.Path == "" {
				clone.URL.Path = "/"
			}
			clone.URL.RawPath = ""
			handler.ServeHTTP(w, clone)
			return
		}
		handler.ServeHTTP(w, r)
	})
}

func requestIDMiddleware(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		rid := requestID(r)
		w.Header().Set("X-Request-Id", rid)
		next.ServeHTTP(w, r)
	})
}

func (a *app) securityHeaders(next http.Handler) http.Handler {
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Header().Set("X-Content-Type-Options", "nosniff")
		w.Header().Set("Referrer-Policy", "no-referrer")
		// CAPTCHA providers are loaded only when Core reports them enabled. Keep
		// the allowlist provider-specific; Core JWTs and application data remain
		// same-origin and are never sent to these origins by the browser.
		w.Header().Set("Content-Security-Policy", "default-src 'self'; worker-src 'self' blob:; script-src 'self' https://challenges.cloudflare.com https://o.alicdn.com https://*.alicdn.com https://turing.captcha.qcloud.com https://turing.captcha.gtimg.com https://ca.turing.captcha.qcloud.com https://global.turing.captcha.gtimg.com https://cloudcache.tencentcs.com; style-src 'self' 'unsafe-inline' https://*.captcha.gtimg.com https://o.alicdn.com https://*.alicdn.com; img-src 'self' data: blob: https:; font-src 'self' data: https://fonts.gstatic.com; connect-src 'self' https://challenges.cloudflare.com https://turing.captcha.qcloud.com https://turing.captcha.gtimg.com https://ca.turing.captcha.qcloud.com https://global.turing.captcha.gtimg.com https://cloudcache.tencentcs.com https://rce.tencentrio.com https://o.alicdn.com https://*.alicdn.com https://*.aliyuncs.com; frame-src 'self' https://challenges.cloudflare.com https://turing.captcha.qcloud.com https://turing.captcha.gtimg.com https://ca.turing.captcha.qcloud.com https://global.turing.captcha.gtimg.com https://cloudcache.tencentcs.com https://o.alicdn.com https://*.alicdn.com https://*.aliyuncs.com; frame-ancestors "+strings.Join(a.frameAncestors, " ")+"; base-uri 'self'; form-action 'self'")
		next.ServeHTTP(w, r)
	})
}

func parseSameSite(value string) (http.SameSite, error) {
	switch strings.ToLower(strings.TrimSpace(value)) {
	case "", "lax":
		return http.SameSiteLaxMode, nil
	case "strict":
		return http.SameSiteStrictMode, nil
	case "none":
		return http.SameSiteNoneMode, nil
	default:
		return 0, errors.New("PLUGIN_COOKIE_SAMESITE must be lax, strict or none")
	}
}

func loadTrustedPublishers(raw string) map[string][]byte {
	out := map[string][]byte{}
	var values map[string]string
	if json.Unmarshal([]byte(raw), &values) != nil {
		return out
	}
	for key, encoded := range values {
		if data, err := base64.StdEncoding.DecodeString(encoded); err == nil && len(data) == 32 {
			out[key] = data
		}
	}
	return out
}

func parseFrameAncestors(raw string) []string {
	values := strings.Fields(raw)
	if len(values) == 0 {
		return []string{"'self'"}
	}
	allowed := make([]string, 0, len(values))
	for _, value := range values {
		if value == "'self'" || value == "'none'" {
			allowed = append(allowed, value)
			continue
		}
		u, err := url.Parse(value)
		if err == nil && (u.Scheme == "http" || u.Scheme == "https") && u.Host != "" && u.User == nil && u.Path == "" && u.RawQuery == "" && u.Fragment == "" {
			allowed = append(allowed, value)
		}
	}
	if len(allowed) == 0 {
		return []string{"'self'"}
	}
	return allowed
}

func deriveConfigKey(raw string) ([]byte, error) {
	raw = strings.TrimSpace(raw)
	if len(raw) < 32 {
		return nil, errors.New("PLUGIN_CONFIG_KEY must contain at least 32 characters")
	}
	hash := sha256.Sum256([]byte(raw))
	return hash[:], nil
}

func main() {
	host := os.Getenv("PLUGIN_HOST")
	if host == "" {
		host = "127.0.0.1"
	}
	port := os.Getenv("PLUGIN_PORT")
	if port == "" {
		port = "8090"
	}
	coreURL := os.Getenv("CORE_BASE_URL")
	if coreURL == "" {
		coreURL = "http://127.0.0.1:8080"
	}
	core, err := newCoreClient(coreURL)
	if err != nil {
		slog.Error("invalid Core URL", "error", err)
		os.Exit(2)
	}
	registryDir := os.Getenv("PLUGIN_REGISTRY_DIR")
	if registryDir == "" {
		registryDir = "./data"
	}
	reg, err := openRegistry(registryDir)
	if err != nil {
		slog.Error("open registry", "error", err)
		os.Exit(2)
	}
	a := newApp(core, reg, registryDir)
	environment := strings.ToLower(strings.TrimSpace(os.Getenv("PLUGIN_ENV")))
	if environment == "" {
		environment = "production"
	}
	a.publicBasePath = strings.TrimRight(strings.TrimSpace(os.Getenv("PLUGIN_PUBLIC_BASE_PATH")), "/")
	a.publicURL = strings.TrimRight(strings.TrimSpace(os.Getenv("PLUGIN_PUBLIC_URL")), "/")
	if a.publicURL != "" {
		if publicErr := validatePublicURL(a.publicURL); publicErr != nil {
			slog.Error("invalid Plugin Admin public URL", "error", publicErr)
			os.Exit(2)
		}
	}
	a.trustProxy = strings.EqualFold(strings.TrimSpace(os.Getenv("PLUGIN_TRUST_PROXY")), "true")
	if a.trustProxy && isLoopbackHost(host) == false {
		slog.Error("PLUGIN_TRUST_PROXY requires a loopback plugin listener")
		os.Exit(2)
	}
	a.cookiePath = os.Getenv("PLUGIN_COOKIE_PATH")
	if a.cookiePath == "" {
		a.cookiePath = "/"
	}
	a.cookieSecure = strings.EqualFold(os.Getenv("PLUGIN_COOKIE_SECURE"), "true")
	if !isLoopbackHost(host) && !a.cookieSecure {
		slog.Error("PLUGIN_COOKIE_SECURE must be true for non-loopback listeners")
		os.Exit(2)
	}
	if sameSite, parseErr := parseSameSite(os.Getenv("PLUGIN_COOKIE_SAMESITE")); parseErr == nil {
		a.cookieSameSite = sameSite
	} else {
		slog.Error("invalid cookie same site", "error", parseErr)
		os.Exit(2)
	}
	if a.cookieSameSite == http.SameSiteNoneMode && !a.cookieSecure {
		slog.Error("SameSite=None requires secure cookie")
		os.Exit(2)
	}
	a.allowUnsigned = strings.EqualFold(os.Getenv("PLUGIN_ALLOW_UNSIGNED"), "true")
	if a.allowUnsigned && (environment != "development" || !isLoopbackHost(host)) {
		slog.Error("unsigned packages are allowed only in development on loopback")
		os.Exit(2)
	}
	if key, keyErr := deriveConfigKey(os.Getenv("PLUGIN_CONFIG_KEY")); keyErr != nil {
		slog.Error("invalid config encryption key", "error", keyErr)
		os.Exit(2)
	} else {
		a.configKey = key
	}
	a.frameAncestors = parseFrameAncestors(os.Getenv("PLUGIN_FRAME_ANCESTORS"))
	a.trustedPublishers = loadTrustedPublishers(os.Getenv("PLUGIN_TRUSTED_PUBLISHERS"))
	marketplaceSource := strings.TrimSpace(os.Getenv("PLUGIN_MARKETPLACE_INDEX"))
	if marketplaceSource == "" {
		marketplaceSource = filepath.Join(registryDir, "marketplace", "index.json")
	}
	allowLoopbackMarketplace := environment == "development" && isLoopbackHost(host)
	marketplace, marketplaceErr := newMarketplaceService(marketplaceSource, os.Getenv("PLUGIN_MARKETPLACE_ALLOWED_HOSTS"), allowLoopbackMarketplace)
	if marketplaceErr != nil {
		slog.Error("invalid marketplace configuration", "error", marketplaceErr)
		os.Exit(2)
	}
	marketplace.indexSHA256 = strings.ToLower(strings.TrimSpace(os.Getenv("PLUGIN_MARKETPLACE_INDEX_SHA256")))
	if marketplace.indexSHA256 != "" && !marketplaceSHA256Pattern.MatchString(marketplace.indexSHA256) {
		slog.Error("invalid marketplace index sha256 pin")
		os.Exit(2)
	}
	if marketplace.remoteURL != nil && !allowLoopbackMarketplace && marketplace.indexSHA256 == "" {
		slog.Error("PLUGIN_MARKETPLACE_INDEX_SHA256 is required for remote production marketplace indexes")
		os.Exit(2)
	}
	a.marketplaceConfig = marketplace
	if err := a.recoverPlugins(); err != nil {
		slog.Error("recover plugins", "error", err)
		os.Exit(2)
	}
	addr := net.JoinHostPort(host, port)
	srv := &http.Server{Addr: addr, Handler: a.routes(), ReadHeaderTimeout: 10 * time.Second, ReadTimeout: 30 * time.Second, WriteTimeout: 30 * time.Second, IdleTimeout: 60 * time.Second}
	slog.Info("plugin-admin listening", "addr", addr)
	stopSignals := make(chan os.Signal, 1)
	signal.Notify(stopSignals, os.Interrupt, syscall.SIGTERM)
	defer signal.Stop(stopSignals)
	go func() {
		<-stopSignals
		shutdownCtx, cancel := context.WithTimeout(context.Background(), 15*time.Second)
		defer cancel()
		_ = srv.Shutdown(shutdownCtx)
		a.shutdown()
	}()
	if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
		slog.Error("plugin-admin stopped", "error", err)
		os.Exit(1)
	}
}

// Keep strconv linked for manifests that use numeric listen settings in future
// revisions; this also makes the validation helper easy to extend without API churn.
var _ = strconv.IntSize