20279197792

Committed 16 Dec 2025 06:52PM UTC coverage: 82.444% (+0.09%) from 82.351%

Build # 20279197792

Build Type

push

github

Committed by

web-flow

Commit Message

Merge pull request #356 from umputun/fix/rest-writeheader-renderjson

fix(webapi): use EncodeJSON to set correct Content-Type header

Coverage Stats

27 of 33 new or added lines in 1 file covered. (81.82%)

1 existing line in 1 file now uncovered.

6410 of 7775 relevant lines covered (82.44%)

275.36 hits per line

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85.58

/app/webapi/webapi.go

// Package webapi provides a web API spam detection service.
package webapi

import (
        "bytes"
        "compress/gzip"
        "context"
        "crypto/rand"
        "crypto/sha1" //nolint
        "embed"
        "encoding/json"
        "errors"
        "fmt"
        "html/template"
        "io"
        "io/fs"
        "math/big"
        "net/http"
        "path"
        "strconv"
        "strings"
        "time"

        "github.com/didip/tollbooth/v8"
        log "github.com/go-pkgz/lgr"
        "github.com/go-pkgz/rest"
        "github.com/go-pkgz/rest/logger"
        "github.com/go-pkgz/routegroup"

        "github.com/umputun/tg-spam/app/storage"
        "github.com/umputun/tg-spam/app/storage/engine"
        "github.com/umputun/tg-spam/lib/approved"
        "github.com/umputun/tg-spam/lib/spamcheck"
)

//go:generate moq --out mocks/detector.go --pkg mocks --with-resets --skip-ensure . Detector
//go:generate moq --out mocks/spam_filter.go --pkg mocks --with-resets --skip-ensure . SpamFilter
//go:generate moq --out mocks/locator.go --pkg mocks --with-resets --skip-ensure . Locator
//go:generate moq --out mocks/detected_spam.go --pkg mocks --with-resets --skip-ensure . DetectedSpam
//go:generate moq --out mocks/storage_engine.go --pkg mocks --with-resets --skip-ensure . StorageEngine
//go:generate moq --out mocks/dictionary.go --pkg mocks --with-resets --skip-ensure . Dictionary

//go:embed assets/* assets/components/*
var templateFS embed.FS
var tmpl = template.Must(template.ParseFS(templateFS, "assets/*.html", "assets/components/*.html"))

// startTime tracks when the server started
var startTime = time.Now()

// Server is a web API server.
type Server struct {
        Config
}

// Config defines  server parameters
type Config struct {
        Version       string        // version to show in /ping
        ListenAddr    string        // listen address
        Detector      Detector      // spam detector
        SpamFilter    SpamFilter    // spam filter (bot)
        DetectedSpam  DetectedSpam  // detected spam accessor
        Locator       Locator       // locator for user info
        Dictionary    Dictionary    // dictionary for stop phrases and ignored words
        StorageEngine StorageEngine // database engine access for backups
        AuthPasswd    string        // basic auth password for user "tg-spam"
        AuthHash      string        // basic auth hash for user "tg-spam". If both AuthPasswd and AuthHash are provided, AuthHash is used
        Dbg           bool          // debug mode
        Settings      Settings      // application settings
}

// Settings contains all application settings
type Settings struct {
        InstanceID               string        `json:"instance_id"`
        PrimaryGroup             string        `json:"primary_group"`
        AdminGroup               string        `json:"admin_group"`
        DisableAdminSpamForward  bool          `json:"disable_admin_spam_forward"`
        LoggerEnabled            bool          `json:"logger_enabled"`
        SuperUsers               []string      `json:"super_users"`
        NoSpamReply              bool          `json:"no_spam_reply"`
        CasEnabled               bool          `json:"cas_enabled"`
        MetaEnabled              bool          `json:"meta_enabled"`
        MetaLinksLimit           int           `json:"meta_links_limit"`
        MetaMentionsLimit        int           `json:"meta_mentions_limit"`
        MetaLinksOnly            bool          `json:"meta_links_only"`
        MetaImageOnly            bool          `json:"meta_image_only"`
        MetaVideoOnly            bool          `json:"meta_video_only"`
        MetaAudioOnly            bool          `json:"meta_audio_only"`
        MetaForwarded            bool          `json:"meta_forwarded"`
        MetaKeyboard             bool          `json:"meta_keyboard"`
        MetaContactOnly          bool          `json:"meta_contact_only"`
        MetaUsernameSymbols      string        `json:"meta_username_symbols"`
        MultiLangLimit           int           `json:"multi_lang_limit"`
        OpenAIEnabled            bool          `json:"openai_enabled"`
        OpenAIVeto               bool          `json:"openai_veto"`
        OpenAIHistorySize        int           `json:"openai_history_size"`
        OpenAIModel              string        `json:"openai_model"`
        OpenAICheckShortMessages bool          `json:"openai_check_short_messages"`
        OpenAICustomPrompts      []string      `json:"openai_custom_prompts"`
        LuaPluginsEnabled        bool          `json:"lua_plugins_enabled"`
        LuaPluginsDir            string        `json:"lua_plugins_dir"`
        LuaEnabledPlugins        []string      `json:"lua_enabled_plugins"`
        LuaDynamicReload         bool          `json:"lua_dynamic_reload"`
        LuaAvailablePlugins      []string      `json:"lua_available_plugins"` // the list of all available Lua plugins
        SamplesDataPath          string        `json:"samples_data_path"`
        DynamicDataPath          string        `json:"dynamic_data_path"`
        WatchIntervalSecs        int           `json:"watch_interval_secs"`
        SimilarityThreshold      float64       `json:"similarity_threshold"`
        MinMsgLen                int           `json:"min_msg_len"`
        MaxEmoji                 int           `json:"max_emoji"`
        MinSpamProbability       float64       `json:"min_spam_probability"`
        ParanoidMode             bool          `json:"paranoid_mode"`
        FirstMessagesCount       int           `json:"first_messages_count"`
        StartupMessageEnabled    bool          `json:"startup_message_enabled"`
        TrainingEnabled          bool          `json:"training_enabled"`
        StorageTimeout           time.Duration `json:"storage_timeout"`
        SoftBanEnabled           bool          `json:"soft_ban_enabled"`
        AbnormalSpacingEnabled   bool          `json:"abnormal_spacing_enabled"`
        HistorySize              int           `json:"history_size"`
        DebugModeEnabled         bool          `json:"debug_mode_enabled"`
        DryModeEnabled           bool          `json:"dry_mode_enabled"`
        TGDebugModeEnabled       bool          `json:"tg_debug_mode_enabled"`
}

// Detector is a spam detector interface.
type Detector interface {
        Check(req spamcheck.Request) (spam bool, cr []spamcheck.Response)
        ApprovedUsers() []approved.UserInfo
        AddApprovedUser(user approved.UserInfo) error
        RemoveApprovedUser(id string) error
        GetLuaPluginNames() []string // Returns the list of available Lua plugin names
}

// SpamFilter is a spam filter, bot interface.
type SpamFilter interface {
        UpdateSpam(msg string) error
        UpdateHam(msg string) error
        ReloadSamples() (err error)
        DynamicSamples() (spam, ham []string, err error)
        RemoveDynamicSpamSample(sample string) error
        RemoveDynamicHamSample(sample string) error
}

// Locator is a storage interface used to get user id by name and vice versa.
type Locator interface {
        UserIDByName(ctx context.Context, userName string) int64
        UserNameByID(ctx context.Context, userID int64) string
}

// DetectedSpam is a storage interface used to get detected spam messages and set added flag.
type DetectedSpam interface {
        Read(ctx context.Context) ([]storage.DetectedSpamInfo, error)
        SetAddedToSamplesFlag(ctx context.Context, id int64) error
        FindByUserID(ctx context.Context, userID int64) (*storage.DetectedSpamInfo, error)
}

// StorageEngine provides access to the database engine for operations like backup
type StorageEngine interface {
        Backup(ctx context.Context, w io.Writer) error
        Type() engine.Type
        BackupSqliteAsPostgres(ctx context.Context, w io.Writer) error
}

// Dictionary is a storage interface for managing stop phrases and ignored words
type Dictionary interface {
        Add(ctx context.Context, t storage.DictionaryType, data string) error
        Delete(ctx context.Context, id int64) error
        Read(ctx context.Context, t storage.DictionaryType) ([]string, error)
        ReadWithIDs(ctx context.Context, t storage.DictionaryType) ([]storage.DictionaryEntry, error)
        Stats(ctx context.Context) (*storage.DictionaryStats, error)
}

// NewServer creates a new web API server.
func NewServer(config Config) *Server {
        return &Server{Config: config}
}

// Run starts server and accepts requests checking for spam messages.
func (s *Server) Run(ctx context.Context) error {
        router := routegroup.New(http.NewServeMux())
        router.Use(rest.Recoverer(log.Default()))
        router.Use(logger.New(logger.Log(log.Default()), logger.Prefix("[DEBUG]")).Handler)
        router.Use(rest.Throttle(1000))
        router.Use(rest.AppInfo("tg-spam", "umputun", s.Version), rest.Ping)
        router.Use(tollbooth.HTTPMiddleware(tollbooth.NewLimiter(50, nil)))
        router.Use(rest.SizeLimit(1024 * 1024)) // 1M max request size

        if s.AuthPasswd != "" || s.AuthHash != "" {
                log.Printf("[INFO] basic auth enabled for webapi server")
                if s.AuthHash != "" {
                        router.Use(rest.BasicAuthWithBcryptHashAndPrompt("tg-spam", s.AuthHash))
                } else {
                        router.Use(rest.BasicAuthWithPrompt("tg-spam", s.AuthPasswd))
                }
        } else {
                log.Printf("[WARN] basic auth disabled, access to webapi is not protected")
        }

        router = s.routes(router) // setup routes

        srv := &http.Server{Addr: s.ListenAddr, Handler: router, ReadTimeout: 5 * time.Second, WriteTimeout: 5 * time.Second}
        go func() {
                <-ctx.Done()
                if err := srv.Shutdown(ctx); err != nil {
                        log.Printf("[WARN] failed to shutdown webapi server: %v", err)
                } else {
                        log.Printf("[INFO] webapi server stopped")
                }
        }()

        log.Printf("[INFO] start webapi server on %s", s.ListenAddr)
        if err := srv.ListenAndServe(); err != nil && !errors.Is(err, http.ErrServerClosed) {
                return fmt.Errorf("failed to run server: %w", err)
        }
        return nil
}

func (s *Server) routes(router *routegroup.Bundle) *routegroup.Bundle {
        // auth api routes
        router.Group().Route(func(authApi *routegroup.Bundle) {
                authApi.Use(s.authMiddleware(rest.BasicAuthWithUserPasswd("tg-spam", s.AuthPasswd)))
                authApi.HandleFunc("POST /check", s.checkMsgHandler)         // check a message for spam
                authApi.HandleFunc("GET /check/{user_id}", s.checkIDHandler) // check user id for spam

                authApi.Mount("/update").Route(func(r *routegroup.Bundle) {
                        // update spam/ham samples
                        r.HandleFunc("POST /spam", s.updateSampleHandler(s.SpamFilter.UpdateSpam)) // update spam samples
                        r.HandleFunc("POST /ham", s.updateSampleHandler(s.SpamFilter.UpdateHam))   // update ham samples
                })

                authApi.Mount("/delete").Route(func(r *routegroup.Bundle) {
                        // delete spam/ham samples
                        r.HandleFunc("POST /spam", s.deleteSampleHandler(s.SpamFilter.RemoveDynamicSpamSample))
                        r.HandleFunc("POST /ham", s.deleteSampleHandler(s.SpamFilter.RemoveDynamicHamSample))
                })

                authApi.Mount("/download").Route(func(r *routegroup.Bundle) {
                        r.HandleFunc("GET /spam", s.downloadSampleHandler(func(spam, _ []string) ([]string, string) {
                                return spam, "spam.txt"
                        }))
                        r.HandleFunc("GET /ham", s.downloadSampleHandler(func(_, ham []string) ([]string, string) {
                                return ham, "ham.txt"
                        }))
                        r.HandleFunc("GET /detected_spam", s.downloadDetectedSpamHandler)
                        r.HandleFunc("GET /backup", s.downloadBackupHandler)
                        r.HandleFunc("GET /export-to-postgres", s.downloadExportToPostgresHandler)
                })

                authApi.HandleFunc("GET /samples", s.getDynamicSamplesHandler)    // get dynamic samples
                authApi.HandleFunc("PUT /samples", s.reloadDynamicSamplesHandler) // reload samples

                authApi.Mount("/users").Route(func(r *routegroup.Bundle) { // manage approved users
                        // add user to the approved list and storage
                        r.HandleFunc("POST /add", s.updateApprovedUsersHandler(s.Detector.AddApprovedUser))
                        // remove user from an approved list and storage
                        r.HandleFunc("POST /delete", s.updateApprovedUsersHandler(s.removeApprovedUser))
                        // get approved users
                        r.HandleFunc("GET /", s.getApprovedUsersHandler)
                })

                authApi.HandleFunc("GET /settings", s.getSettingsHandler) // get application settings

                authApi.Mount("/dictionary").Route(func(r *routegroup.Bundle) { // manage dictionary
                        // add stop phrase or ignored word
                        r.HandleFunc("POST /add", s.addDictionaryEntryHandler)
                        // delete entry by id
                        r.HandleFunc("POST /delete", s.deleteDictionaryEntryHandler)
                        // get all entries
                        r.HandleFunc("GET /", s.getDictionaryEntriesHandler)
                })
        })

        router.Group().Route(func(webUI *routegroup.Bundle) {
                webUI.Use(s.authMiddleware(rest.BasicAuthWithPrompt("tg-spam", s.AuthPasswd)))
                webUI.HandleFunc("GET /", s.htmlSpamCheckHandler)                         // serve template for webUI UI
                webUI.HandleFunc("GET /manage_samples", s.htmlManageSamplesHandler)       // serve manage samples page
                webUI.HandleFunc("GET /manage_users", s.htmlManageUsersHandler)           // serve manage users page
                webUI.HandleFunc("GET /manage_dictionary", s.htmlManageDictionaryHandler) // serve manage dictionary page
                webUI.HandleFunc("GET /detected_spam", s.htmlDetectedSpamHandler)         // serve detected spam page
                webUI.HandleFunc("GET /list_settings", s.htmlSettingsHandler)             // serve settings
                webUI.HandleFunc("POST /detected_spam/add", s.htmlAddDetectedSpamHandler) // add detected spam to samples

                // handle logout - force Basic Auth re-authentication
                webUI.HandleFunc("GET /logout", func(w http.ResponseWriter, _ *http.Request) {
                        w.Header().Set("WWW-Authenticate", `Basic realm="tg-spam"`)
                        w.WriteHeader(http.StatusUnauthorized)
                        fmt.Fprintln(w, "Logged out successfully")
                })

                // serve only specific static files at root level
                staticFiles := newStaticFS(templateFS,
                        staticFileMapping{urlPath: "styles.css", filesysPath: "assets/styles.css"},
                        staticFileMapping{urlPath: "logo.png", filesysPath: "assets/logo.png"},
                        staticFileMapping{urlPath: "spinner.svg", filesysPath: "assets/spinner.svg"},
                )
                webUI.HandleFiles("/", http.FS(staticFiles))
        })

        return router
}

// checkMsgHandler handles POST /check request.
// it gets message text and user id from request body and returns spam status and check results.
func (s *Server) checkMsgHandler(w http.ResponseWriter, r *http.Request) {
        type CheckResultDisplay struct {
                Spam   bool
                Checks []spamcheck.Response
        }

        isHtmxRequest := r.Header.Get("HX-Request") == "true"

        req := spamcheck.Request{CheckOnly: true}
        if !isHtmxRequest {
                // API request
                if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
                        _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "can't decode request", "details": err.Error()})
                        log.Printf("[WARN] can't decode request: %v", err)
                        return
                }
        } else {
                // for hx-request (HTMX) we need to get the values from the form
                req.UserID = r.FormValue("user_id")
                req.UserName = r.FormValue("user_name")
                req.Msg = r.FormValue("msg")
        }

        spam, cr := s.Detector.Check(req)
        if !isHtmxRequest {
                // for API request return JSON
                rest.RenderJSON(w, rest.JSON{"spam": spam, "checks": cr})
                return
        }

        if req.Msg == "" {
                w.Header().Set("HX-Retarget", "#error-message")
                fmt.Fprintln(w, "<div class='alert alert-danger'>Valid message required.</div>")
                return
        }

        // render result for HTMX request
        resultDisplay := CheckResultDisplay{
                Spam:   spam,
                Checks: cr,
        }

        if err := tmpl.ExecuteTemplate(w, "check_results", resultDisplay); err != nil {
                log.Printf("[WARN] can't execute result template: %v", err)
                http.Error(w, "Error rendering result", http.StatusInternalServerError)
                return
        }
}

// checkIDHandler handles GET /check/{user_id} request.
// it returns JSON with the status "spam" or "ham" for a given user id.
// if user is spammer, it also returns check results.
func (s *Server) checkIDHandler(w http.ResponseWriter, r *http.Request) {
        type info struct {
                UserName  string               `json:"user_name,omitempty"`
                Message   string               `json:"message,omitempty"`
                Timestamp time.Time            `json:"timestamp,omitempty"`
                Checks    []spamcheck.Response `json:"checks,omitempty"`
        }
        resp := struct {
                Status string `json:"status"`
                Info   *info  `json:"info,omitempty"`
        }{
                Status: "ham",
        }

        userID, err := strconv.ParseInt(r.PathValue("user_id"), 10, 64)
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "can't parse user id", "details": err.Error()})
                return
        }

        si, err := s.DetectedSpam.FindByUserID(r.Context(), userID)
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't get user info", "details": err.Error()})
                return
        }
        if si != nil {
                resp.Status = "spam"
                resp.Info = &info{
                        UserName:  si.UserName,
                        Message:   si.Text,
                        Timestamp: si.Timestamp,
                        Checks:    si.Checks,
                }
        }
        rest.RenderJSON(w, resp)
}

// getDynamicSamplesHandler handles GET /samples request. It returns dynamic samples both for spam and ham.
func (s *Server) getDynamicSamplesHandler(w http.ResponseWriter, _ *http.Request) {
        spam, ham, err := s.SpamFilter.DynamicSamples()
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't get dynamic samples", "details": err.Error()})
                return
        }
        rest.RenderJSON(w, rest.JSON{"spam": spam, "ham": ham})
}

// downloadSampleHandler handles GET /download/spam|ham request. It returns dynamic samples both for spam and ham.
func (s *Server) downloadSampleHandler(pickFn func(spam, ham []string) ([]string, string)) func(w http.ResponseWriter, r *http.Request) {
        return func(w http.ResponseWriter, _ *http.Request) {
                spam, ham, err := s.SpamFilter.DynamicSamples()
                if err != nil {
                        _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't get dynamic samples", "details": err.Error()})
                        return
                }
                samples, name := pickFn(spam, ham)
                body := strings.Join(samples, "\n")
                w.Header().Set("Content-Type", "text/plain; charset=utf-8")
                w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%q", name))
                w.Header().Set("Content-Length", strconv.Itoa(len(body)))
                w.WriteHeader(http.StatusOK)
                _, _ = w.Write([]byte(body))
        }
}

// updateSampleHandler handles POST /update/spam|ham request. It updates dynamic samples both for spam and ham.
func (s *Server) updateSampleHandler(updFn func(msg string) error) func(w http.ResponseWriter, r *http.Request) {
        return func(w http.ResponseWriter, r *http.Request) {
                var req struct {
                        Msg string `json:"msg"`
                }

                isHtmxRequest := r.Header.Get("HX-Request") == "true"

                if isHtmxRequest {
                        req.Msg = r.FormValue("msg")
                } else {
                        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
                                _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "can't decode request", "details": err.Error()})
                                return
                        }
                }

                err := updFn(req.Msg)
                if err != nil {
                        _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't update samples", "details": err.Error()})
                        return
                }

                if isHtmxRequest {
                        s.renderSamples(w, "samples_list")
                } else {
                        rest.RenderJSON(w, rest.JSON{"updated": true, "msg": req.Msg})
                }
        }
}

// deleteSampleHandler handles DELETE /samples request. It deletes dynamic samples both for spam and ham.
func (s *Server) deleteSampleHandler(delFn func(msg string) error) func(w http.ResponseWriter, r *http.Request) {
        return func(w http.ResponseWriter, r *http.Request) {
                var req struct {
                        Msg string `json:"msg"`
                }
                isHtmxRequest := r.Header.Get("HX-Request") == "true"
                if isHtmxRequest {
                        req.Msg = r.FormValue("msg")
                } else {
                        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
                                _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "can't decode request", "details": err.Error()})
                                return
                        }
                }

                if err := delFn(req.Msg); err != nil {
                        _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't delete sample", "details": err.Error()})
                        return
                }

                if isHtmxRequest {
                        s.renderSamples(w, "samples_list")
                } else {
                        rest.RenderJSON(w, rest.JSON{"deleted": true, "msg": req.Msg, "count": 1})
                }
        }
}

// reloadDynamicSamplesHandler handles PUT /samples request. It reloads dynamic samples from db storage.
func (s *Server) reloadDynamicSamplesHandler(w http.ResponseWriter, _ *http.Request) {
        if err := s.SpamFilter.ReloadSamples(); err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't reload samples", "details": err.Error()})
                return
        }
        rest.RenderJSON(w, rest.JSON{"reloaded": true})
}

// updateApprovedUsersHandler handles POST /users/add and /users/delete requests, it adds or removes users from approved list.
func (s *Server) updateApprovedUsersHandler(updFn func(ui approved.UserInfo) error) func(w http.ResponseWriter, r *http.Request) {
        return func(w http.ResponseWriter, r *http.Request) {
                req := approved.UserInfo{}
                isHtmxRequest := r.Header.Get("HX-Request") == "true"
                if isHtmxRequest {
                        req.UserID = r.FormValue("user_id")
                        req.UserName = r.FormValue("user_name")
                } else {
                        if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
                                _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "can't decode request", "details": err.Error()})
                                return
                        }
                }

                // try to get userID from request and fallback to userName lookup if it's empty
                if req.UserID == "" {
                        req.UserID = strconv.FormatInt(s.Locator.UserIDByName(r.Context(), req.UserName), 10)
                }

                if req.UserID == "" || req.UserID == "0" {
                        if isHtmxRequest {
                                w.Header().Set("HX-Retarget", "#error-message")
                                fmt.Fprintln(w, "<div class='alert alert-danger'>Either userid or valid username required.</div>")
                                return
                        }
                        _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "user ID is required"})
                        return
                }

                // add or remove user from the approved list of detector
                if err := updFn(req); err != nil {
                        _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't update approved users", "details": err.Error()})
                        return
                }

                if isHtmxRequest {
                        users := s.Detector.ApprovedUsers()
                        tmplData := struct {
                                ApprovedUsers      []approved.UserInfo
                                TotalApprovedUsers int
                        }{
                                ApprovedUsers:      users,
                                TotalApprovedUsers: len(users),
                        }

                        if err := tmpl.ExecuteTemplate(w, "users_list", tmplData); err != nil {
                                http.Error(w, "Error executing template", http.StatusInternalServerError)
                                return
                        }

                } else {
                        rest.RenderJSON(w, rest.JSON{"updated": true, "user_id": req.UserID, "user_name": req.UserName})
                }
        }
}

// removeApprovedUser is adopter for updateApprovedUsersHandler updFn
func (s *Server) removeApprovedUser(req approved.UserInfo) error {
        if err := s.Detector.RemoveApprovedUser(req.UserID); err != nil {
                return fmt.Errorf("failed to remove approved user %s: %w", req.UserID, err)
        }
        return nil
}

// getApprovedUsersHandler handles GET /users request. It returns list of approved users.
func (s *Server) getApprovedUsersHandler(w http.ResponseWriter, _ *http.Request) {
        rest.RenderJSON(w, rest.JSON{"user_ids": s.Detector.ApprovedUsers()})
}

// getSettingsHandler returns application settings, including the list of available Lua plugins
func (s *Server) getSettingsHandler(w http.ResponseWriter, _ *http.Request) {
        // get the list of available Lua plugins before returning settings
        s.Settings.LuaAvailablePlugins = s.Detector.GetLuaPluginNames()
        rest.RenderJSON(w, s.Settings)
}

// getDictionaryEntriesHandler handles GET /dictionary request. It returns stop phrases and ignored words.
func (s *Server) getDictionaryEntriesHandler(w http.ResponseWriter, r *http.Request) {
        stopPhrases, err := s.Dictionary.Read(r.Context(), storage.DictionaryTypeStopPhrase)
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't get stop phrases", "details": err.Error()})
                return
        }

        ignoredWords, err := s.Dictionary.Read(r.Context(), storage.DictionaryTypeIgnoredWord)
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't get ignored words", "details": err.Error()})
                return
        }

        rest.RenderJSON(w, rest.JSON{"stop_phrases": stopPhrases, "ignored_words": ignoredWords})
}

// addDictionaryEntryHandler handles POST /dictionary/add request. It adds a stop phrase or ignored word.
func (s *Server) addDictionaryEntryHandler(w http.ResponseWriter, r *http.Request) {
        var req struct {
                Type string `json:"type"`
                Data string `json:"data"`
        }

        isHtmxRequest := r.Header.Get("HX-Request") == "true"

        if isHtmxRequest {
                req.Type = r.FormValue("type")
                req.Data = r.FormValue("data")
        } else {
                if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
                        _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "can't decode request", "details": err.Error()})
                        return
                }
        }

        if req.Data == "" {
                if isHtmxRequest {
                        w.Header().Set("HX-Retarget", "#error-message")
                        fmt.Fprintln(w, "<div class='alert alert-danger'>Data cannot be empty.</div>")
                        return
                }
                _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "data cannot be empty"})
                return
        }

        dictType := storage.DictionaryType(req.Type)
        if err := dictType.Validate(); err != nil {
                if isHtmxRequest {
                        w.Header().Set("HX-Retarget", "#error-message")
                        fmt.Fprintf(w, "<div class='alert alert-danger'>Invalid type: %v</div>", err)
                        return
                }
                _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "invalid type", "details": err.Error()})
                return
        }

        if err := s.Dictionary.Add(r.Context(), dictType, req.Data); err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't add entry", "details": err.Error()})
                return
        }

        // reload samples to apply dictionary changes immediately
        if err := s.SpamFilter.ReloadSamples(); err != nil {
                log.Printf("[WARN] failed to reload samples after dictionary add: %v", err)
                if !isHtmxRequest {
                        _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "entry added but reload failed", "details": err.Error()})
                        return
                }
                // for HTMX, log but continue rendering (entry was added successfully)
        }

        if isHtmxRequest {
                s.renderDictionary(r.Context(), w, "dictionary_list")
        } else {
                rest.RenderJSON(w, rest.JSON{"added": true, "type": req.Type, "data": req.Data})
        }
}

// deleteDictionaryEntryHandler handles POST /dictionary/delete request. It deletes an entry by data.
func (s *Server) deleteDictionaryEntryHandler(w http.ResponseWriter, r *http.Request) {
        var req struct {
                ID int64 `json:"id"`
        }

        isHtmxRequest := r.Header.Get("HX-Request") == "true"

        if isHtmxRequest {
                idStr := r.FormValue("id")
                var err error
                req.ID, err = strconv.ParseInt(idStr, 10, 64)
                if err != nil {
                        w.Header().Set("HX-Retarget", "#error-message")
                        fmt.Fprintf(w, "<div class='alert alert-danger'>Invalid ID: %v</div>", err)
                        return
                }
        } else {
                if err := json.NewDecoder(r.Body).Decode(&req); err != nil {
                        _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "can't decode request", "details": err.Error()})
                        return
                }
        }

        if err := s.Dictionary.Delete(r.Context(), req.ID); err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't delete entry", "details": err.Error()})
                return
        }

        // reload samples to apply dictionary changes immediately
        if err := s.SpamFilter.ReloadSamples(); err != nil {
                log.Printf("[WARN] failed to reload samples after dictionary delete: %v", err)
                if !isHtmxRequest {
                        _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "entry deleted but reload failed", "details": err.Error()})
                        return
                }
                // for HTMX, log but continue rendering (entry was deleted successfully)
        }

        if isHtmxRequest {
                s.renderDictionary(r.Context(), w, "dictionary_list")
        } else {
                rest.RenderJSON(w, rest.JSON{"deleted": true, "id": req.ID})
        }
}

// htmlSpamCheckHandler handles GET / request.
// It returns rendered spam_check.html template with all the components.
func (s *Server) htmlSpamCheckHandler(w http.ResponseWriter, _ *http.Request) {
        tmplData := struct {
                Version string
        }{
                Version: s.Version,
        }

        if err := tmpl.ExecuteTemplate(w, "spam_check.html", tmplData); err != nil {
                log.Printf("[WARN] can't execute template: %v", err)
                http.Error(w, "Error executing template", http.StatusInternalServerError)
                return
        }
}

// htmlManageSamplesHandler handles GET /manage_samples request.
// It returns rendered manage_samples.html template with all the components.
func (s *Server) htmlManageSamplesHandler(w http.ResponseWriter, _ *http.Request) {
        s.renderSamples(w, "manage_samples.html")
}

func (s *Server) htmlManageUsersHandler(w http.ResponseWriter, _ *http.Request) {
        users := s.Detector.ApprovedUsers()
        tmplData := struct {
                ApprovedUsers      []approved.UserInfo
                TotalApprovedUsers int
        }{
                ApprovedUsers:      users,
                TotalApprovedUsers: len(users),
        }
        tmplData.TotalApprovedUsers = len(tmplData.ApprovedUsers)

        if err := tmpl.ExecuteTemplate(w, "manage_users.html", tmplData); err != nil {
                log.Printf("[WARN] can't execute template: %v", err)
                http.Error(w, "Error executing template", http.StatusInternalServerError)
                return
        }
}

func (s *Server) htmlManageDictionaryHandler(w http.ResponseWriter, r *http.Request) {
        s.renderDictionary(r.Context(), w, "manage_dictionary.html")
}

func (s *Server) htmlDetectedSpamHandler(w http.ResponseWriter, r *http.Request) {
        ds, err := s.DetectedSpam.Read(r.Context())
        if err != nil {
                log.Printf("[ERROR] Failed to fetch detected spam: %v", err)
                http.Error(w, "Internal Server Error", http.StatusInternalServerError)
                return
        }

        // clean up detected spam entries
        for i, d := range ds {
                d.Text = strings.ReplaceAll(d.Text, "'", " ")
                d.Text = strings.ReplaceAll(d.Text, "\n", " ")
                d.Text = strings.ReplaceAll(d.Text, "\r", " ")
                d.Text = strings.ReplaceAll(d.Text, "\t", " ")
                d.Text = strings.ReplaceAll(d.Text, "\"", " ")
                d.Text = strings.ReplaceAll(d.Text, "\\", " ")
                ds[i] = d
        }

        // get filter from query param, default to "all"
        filter := r.URL.Query().Get("filter")
        if filter == "" {
                filter = "all"
        }

        // apply filtering
        var filteredDS []storage.DetectedSpamInfo
        switch filter {
        case "non-classified":
                for _, entry := range ds {
                        hasClassifierHam := false
                        for _, check := range entry.Checks {
                                if check.Name == "classifier" && !check.Spam {
                                        hasClassifierHam = true
                                        break
                                }
                        }
                        if hasClassifierHam {
                                filteredDS = append(filteredDS, entry)
                        }
                }
        case "openai":
                for _, entry := range ds {
                        hasOpenAI := false
                        for _, check := range entry.Checks {
                                if check.Name == "openai" {
                                        hasOpenAI = true
                                        break
                                }
                        }
                        if hasOpenAI {
                                filteredDS = append(filteredDS, entry)
                        }
                }
        default: // "all" or any other value
                filteredDS = ds
        }

        tmplData := struct {
                DetectedSpamEntries []storage.DetectedSpamInfo
                TotalDetectedSpam   int
                FilteredCount       int
                Filter              string
                OpenAIEnabled       bool
        }{
                DetectedSpamEntries: filteredDS,
                TotalDetectedSpam:   len(ds),
                FilteredCount:       len(filteredDS),
                Filter:              filter,
                OpenAIEnabled:       s.Settings.OpenAIEnabled,
        }

        // if it's an HTMX request, render both content and count display for OOB swap
        if r.Header.Get("HX-Request") == "true" {
                var buf bytes.Buffer

                // first render the content template
                if err := tmpl.ExecuteTemplate(&buf, "detected_spam_content", tmplData); err != nil {
                        log.Printf("[WARN] can't execute content template: %v", err)
                        http.Error(w, "Error executing template", http.StatusInternalServerError)
                        return
                }

                // then append OOB swap for the count display
                countHTML := ""
                if filter != "all" {
                        countHTML = fmt.Sprintf("(%d/%d)", len(filteredDS), len(ds))
                } else {
                        countHTML = fmt.Sprintf("(%d)", len(ds))
                }

                buf.WriteString(fmt.Sprintf(`<span id="count-display" hx-swap-oob="true">%s</span>`, countHTML))

                // write the combined response
                if _, err := buf.WriteTo(w); err != nil {
                        log.Printf("[WARN] failed to write response: %v", err)
                }
                return
        }

        // full page render for normal requests
        if err := tmpl.ExecuteTemplate(w, "detected_spam.html", tmplData); err != nil {
                log.Printf("[WARN] can't execute template: %v", err)
                http.Error(w, "Error executing template", http.StatusInternalServerError)
                return
        }
}

func (s *Server) htmlAddDetectedSpamHandler(w http.ResponseWriter, r *http.Request) {
        reportErr := func(err error, _ int) {
                w.Header().Set("HX-Retarget", "#error-message")
                fmt.Fprintf(w, "<div class='alert alert-danger'>%s</div>", err)
        }
        msg := r.FormValue("msg")

        id, err := strconv.ParseInt(r.FormValue("id"), 10, 64)
        if err != nil || msg == "" {
                log.Printf("[WARN] bad request: %v", err)
                reportErr(fmt.Errorf("bad request: %v", err), http.StatusBadRequest)
                return
        }

        if err := s.SpamFilter.UpdateSpam(msg); err != nil {
                log.Printf("[WARN] failed to update spam samples: %v", err)
                reportErr(fmt.Errorf("can't update spam samples: %v", err), http.StatusInternalServerError)
                return

        }
        if err := s.DetectedSpam.SetAddedToSamplesFlag(r.Context(), id); err != nil {
                log.Printf("[WARN] failed to update detected spam: %v", err)
                reportErr(fmt.Errorf("can't update detected spam: %v", err), http.StatusInternalServerError)
                return
        }
        w.WriteHeader(http.StatusOK)
}

func (s *Server) htmlSettingsHandler(w http.ResponseWriter, _ *http.Request) {
        // get database information if StorageEngine is available
        var dbInfo struct {
                DatabaseType   string `json:"database_type"`
                GID            string `json:"gid"`
                DatabaseStatus string `json:"database_status"`
        }

        if s.StorageEngine != nil {
                // try to cast to SQL engine to get type information
                if sqlEngine, ok := s.StorageEngine.(*engine.SQL); ok {
                        dbInfo.DatabaseType = string(sqlEngine.Type())
                        dbInfo.GID = sqlEngine.GID()
                        dbInfo.DatabaseStatus = "Connected"
                } else {
                        dbInfo.DatabaseType = "Unknown"
                        dbInfo.DatabaseStatus = "Connected (unknown type)"
                }
        } else {
                dbInfo.DatabaseStatus = "Not connected"
        }

        // get backup information
        backupURL := "/download/backup"
        backupFilename := fmt.Sprintf("tg-spam-backup-%s-%s.sql.gz", dbInfo.DatabaseType, time.Now().Format("20060102-150405"))

        // get system info - uptime since server start
        uptime := time.Since(startTime)

        // get the list of available Lua plugins
        s.Settings.LuaAvailablePlugins = s.Detector.GetLuaPluginNames()

        data := struct {
                Settings
                Version  string
                Database struct {
                        Type   string
                        GID    string
                        Status string
                }
                Backup struct {
                        URL      string
                        Filename string
                }
                System struct {
                        Uptime string
                }
        }{
                Settings: s.Settings,
                Version:  s.Version,
                Database: struct {
                        Type   string
                        GID    string
                        Status string
                }{
                        Type:   dbInfo.DatabaseType,
                        GID:    dbInfo.GID,
                        Status: dbInfo.DatabaseStatus,
                },
                Backup: struct {
                        URL      string
                        Filename string
                }{
                        URL:      backupURL,
                        Filename: backupFilename,
                },
                System: struct {
                        Uptime string
                }{
                        Uptime: formatDuration(uptime),
                },
        }

        if err := tmpl.ExecuteTemplate(w, "settings.html", data); err != nil {
                log.Printf("[WARN] can't execute template: %v", err)
                http.Error(w, "Error executing template", http.StatusInternalServerError)
                return
        }
}

// formatDuration formats a duration in a human-readable way
func formatDuration(d time.Duration) string {
        days := int(d.Hours() / 24)
        hours := int(d.Hours()) % 24
        minutes := int(d.Minutes()) % 60

        if days > 0 {
                return fmt.Sprintf("%dd %dh %dm", days, hours, minutes)
        }

        if hours > 0 {
                return fmt.Sprintf("%dh %dm", hours, minutes)
        }

        return fmt.Sprintf("%dm", minutes)
}

func (s *Server) downloadDetectedSpamHandler(w http.ResponseWriter, r *http.Request) {
        ctx := r.Context()
        spam, err := s.DetectedSpam.Read(ctx)
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't get detected spam", "details": err.Error()})
                return
        }

        type jsonSpamInfo struct {
                ID        int64                `json:"id"`
                GID       string               `json:"gid"`
                Text      string               `json:"text"`
                UserID    int64                `json:"user_id"`
                UserName  string               `json:"user_name"`
                Timestamp time.Time            `json:"timestamp"`
                Added     bool                 `json:"added"`
                Checks    []spamcheck.Response `json:"checks"`
        }

        // convert entries to jsonl format with lowercase fields
        lines := make([]string, 0, len(spam))
        for _, entry := range spam {
                data, err := json.Marshal(jsonSpamInfo{
                        ID:        entry.ID,
                        GID:       entry.GID,
                        Text:      entry.Text,
                        UserID:    entry.UserID,
                        UserName:  entry.UserName,
                        Timestamp: entry.Timestamp,
                        Added:     entry.Added,
                        Checks:    entry.Checks,
                })
                if err != nil {
                        _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't marshal entry", "details": err.Error()})
                        return
                }
                lines = append(lines, string(data))
        }

        body := strings.Join(lines, "\n")
        w.Header().Set("Content-Type", "application/x-jsonlines")
        w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%q", "detected_spam.jsonl"))
        w.Header().Set("Content-Length", strconv.Itoa(len(body)))
        w.WriteHeader(http.StatusOK)
        _, _ = w.Write([]byte(body))
}

// downloadBackupHandler streams a database backup as an SQL file with gzip compression
// Files are always compressed and always have .gz extension to ensure consistency
func (s *Server) downloadBackupHandler(w http.ResponseWriter, r *http.Request) {
        if s.StorageEngine == nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "storage engine not available"})
                return
        }

        // set filename based on database type and timestamp
        dbType := "db"
        sqlEng, ok := s.StorageEngine.(*engine.SQL)
        if ok {
                dbType = string(sqlEng.Type())
        }
        timestamp := time.Now().Format("20060102-150405")

        // always use a .gz extension as the content is always compressed
        filename := fmt.Sprintf("tg-spam-backup-%s-%s.sql.gz", dbType, timestamp)

        // set headers for file download - note we're using application/octet-stream
        // instead of application/sql to prevent browsers from trying to interpret the file
        w.Header().Set("Content-Type", "application/octet-stream")
        w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%q", filename))
        w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
        w.Header().Set("Pragma", "no-cache")
        w.Header().Set("Expires", "0")

        // create a gzip writer that streams to response
        gzipWriter := gzip.NewWriter(w)
        defer func() {
                if err := gzipWriter.Close(); err != nil {
                        log.Printf("[ERROR] failed to close gzip writer: %v", err)
                }
        }()

        // stream backup directly to response through gzip
        if err := s.StorageEngine.Backup(r.Context(), gzipWriter); err != nil {
                log.Printf("[ERROR] failed to create backup: %v", err)
                // we've already started writing the response, so we can't send a proper error response
                return
        }

        // flush the gzip writer to ensure all data is written
        if err := gzipWriter.Flush(); err != nil {
                log.Printf("[ERROR] failed to flush gzip writer: %v", err)
        }
}

// downloadExportToPostgresHandler streams a PostgreSQL-compatible export from a SQLite database
func (s *Server) downloadExportToPostgresHandler(w http.ResponseWriter, r *http.Request) {
        if s.StorageEngine == nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "storage engine not available"})
                return
        }

        // check if the database is SQLite
        if s.StorageEngine.Type() != engine.Sqlite {
                _ = rest.EncodeJSON(w, http.StatusBadRequest, rest.JSON{"error": "source database must be SQLite"})
                return
        }

        // set filename based on timestamp
        timestamp := time.Now().Format("20060102-150405")
        filename := fmt.Sprintf("tg-spam-sqlite-to-postgres-%s.sql.gz", timestamp)

        // set headers for file download
        w.Header().Set("Content-Type", "application/octet-stream")
        w.Header().Set("Content-Disposition", fmt.Sprintf("attachment; filename=%q", filename))
        w.Header().Set("Cache-Control", "no-cache, no-store, must-revalidate")
        w.Header().Set("Pragma", "no-cache")
        w.Header().Set("Expires", "0")

        // create a gzip writer that streams to response
        gzipWriter := gzip.NewWriter(w)
        defer func() {
                if err := gzipWriter.Close(); err != nil {
                        log.Printf("[ERROR] failed to close gzip writer: %v", err)
                }
        }()

        // stream export directly to response through gzip
        if err := s.StorageEngine.BackupSqliteAsPostgres(r.Context(), gzipWriter); err != nil {
                log.Printf("[ERROR] failed to create export: %v", err)
                // we've already started writing the response, so we can't send a proper error response
                return
        }

        // flush the gzip writer to ensure all data is written
        if err := gzipWriter.Flush(); err != nil {
                log.Printf("[ERROR] failed to flush gzip writer: %v", err)
        }
}

func (s *Server) renderSamples(w http.ResponseWriter, tmplName string) {
        spam, ham, err := s.SpamFilter.DynamicSamples()
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't fetch samples", "details": err.Error()})
                return
        }

        spam, ham = s.reverseSamples(spam, ham)

        type smpleWithID struct {
                ID     string
                Sample string
        }

        makeID := func(s string) string {
                hash := sha1.New() //nolint
                if _, err := hash.Write([]byte(s)); err != nil {
                        return fmt.Sprintf("%x", s)
                }
                return fmt.Sprintf("%x", hash.Sum(nil))
        }

        tmplData := struct {
                SpamSamples      []smpleWithID
                HamSamples       []smpleWithID
                TotalHamSamples  int
                TotalSpamSamples int
        }{
                TotalHamSamples:  len(ham),
                TotalSpamSamples: len(spam),
        }
        for _, s := range spam {
                tmplData.SpamSamples = append(tmplData.SpamSamples, smpleWithID{ID: makeID(s), Sample: s})
        }
        for _, h := range ham {
                tmplData.HamSamples = append(tmplData.HamSamples, smpleWithID{ID: makeID(h), Sample: h})
        }

        if err := tmpl.ExecuteTemplate(w, tmplName, tmplData); err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't execute template", "details": err.Error()})
                return
        }
}

func (s *Server) authMiddleware(mw func(next http.Handler) http.Handler) func(next http.Handler) http.Handler {
        if s.AuthPasswd == "" {
                return func(next http.Handler) http.Handler {
                        return next
                }
        }
        return func(next http.Handler) http.Handler {
                return mw(next)
        }
}

// reverseSamples returns reversed lists of spam and ham samples
func (s *Server) reverseSamples(spam, ham []string) (revSpam, revHam []string) {
        revSpam = make([]string, len(spam))
        revHam = make([]string, len(ham))

        for i, j := 0, len(spam)-1; i < len(spam); i, j = i+1, j-1 {
                revSpam[i] = spam[j]
        }
        for i, j := 0, len(ham)-1; i < len(ham); i, j = i+1, j-1 {
                revHam[i] = ham[j]
        }
        return revSpam, revHam
}

// renderDictionary renders dictionary entries for HTMX or full page request
func (s *Server) renderDictionary(ctx context.Context, w http.ResponseWriter, tmplName string) {
        stopPhrases, err := s.Dictionary.ReadWithIDs(ctx, storage.DictionaryTypeStopPhrase)
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't fetch stop phrases", "details": err.Error()})
                return
        }

        ignoredWords, err := s.Dictionary.ReadWithIDs(ctx, storage.DictionaryTypeIgnoredWord)
        if err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't fetch ignored words", "details": err.Error()})
                return
        }

        tmplData := struct {
                StopPhrases       []storage.DictionaryEntry
                IgnoredWords      []storage.DictionaryEntry
                TotalStopPhrases  int
                TotalIgnoredWords int
        }{
                StopPhrases:       stopPhrases,
                IgnoredWords:      ignoredWords,
                TotalStopPhrases:  len(stopPhrases),
                TotalIgnoredWords: len(ignoredWords),
        }

        if err := tmpl.ExecuteTemplate(w, tmplName, tmplData); err != nil {
                _ = rest.EncodeJSON(w, http.StatusInternalServerError, rest.JSON{"error": "can't execute template", "details": err.Error()})
                return
        }
}

// staticFS is a filtered filesystem that only exposes specific static files
type staticFS struct {
        fs        fs.FS
        urlToPath map[string]string
}

// staticFileMapping defines a mapping between URL path and filesystem path
type staticFileMapping struct {
        urlPath     string
        filesysPath string
}

func newStaticFS(fsys fs.FS, files ...staticFileMapping) *staticFS {
        urlToPath := make(map[string]string)
        for _, f := range files {
                urlToPath[f.urlPath] = f.filesysPath
        }

        return &staticFS{
                fs:        fsys,
                urlToPath: urlToPath,
        }
}

func (sfs *staticFS) Open(name string) (fs.File, error) {
        cleanName := path.Clean("/" + name)[1:]

        fsPath, ok := sfs.urlToPath[cleanName]
        if !ok {
                return nil, fs.ErrNotExist
        }

        file, err := sfs.fs.Open(fsPath)
        if err != nil {
                return nil, fmt.Errorf("failed to open static file %s: %w", fsPath, err)
        }
        return file, nil
}

// GenerateRandomPassword generates a random password of a given length
func GenerateRandomPassword(length int) (string, error) {
        const charset = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789!@#$%^&*()_+"
        const charsetLen = int64(len(charset))

        result := make([]byte, length)
        for i := 0; i < length; i++ {
                n, err := rand.Int(rand.Reader, big.NewInt(charsetLen))
                if err != nil {
                        return "", fmt.Errorf("failed to generate random number: %w", err)
                }
                result[i] = charset[n.Int64()]
        }
        return string(result), nil
}

umputun / tg-spam / 20279197792

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