refactor: continue code cleanup

go_backend/audio_metadata.go

@@ -44,7 +44,6 @@ type OggQuality struct {
 // ID3 Tag Reading (MP3)
 // =============================================================================
 
-// ReadID3Tags reads ID3v2 and ID3v1 tags from an MP3 file
 func ReadID3Tags(filePath string) (*AudioMetadata, error) {
 	file, err := os.Open(filePath)
 	if err != nil {
@@ -87,7 +86,6 @@ func ReadID3Tags(filePath string) (*AudioMetadata, error) {
 	return metadata, nil
 }
 
-// readID3v2 reads ID3v2 tags from the beginning of file
 func readID3v2(file *os.File) (*AudioMetadata, error) {
 	file.Seek(0, io.SeekStart)
 
@@ -137,7 +135,6 @@ func readID3v2(file *os.File) (*AudioMetadata, error) {
 	return metadata, nil
 }
 
-// parseID3v22Frames parses ID3v2.2 frames (3-char frame IDs)
 func parseID3v22Frames(data []byte, metadata *AudioMetadata, tagUnsync bool) {
 	pos := 0
 	for pos+6 < len(data) {
@@ -286,7 +283,6 @@ func parseID3v23Frames(data []byte, metadata *AudioMetadata, version byte, tagUn
 	}
 }
 
-// readID3v1 reads ID3v1 tag from end of file
 func readID3v1(file *os.File) (*AudioMetadata, error) {
 	if _, err := file.Seek(-128, io.SeekEnd); err != nil {
 		return nil, err
@@ -321,7 +317,6 @@ func readID3v1(file *os.File) (*AudioMetadata, error) {
 	return metadata, nil
 }
 
-// extractTextFrame extracts text from ID3 text frame
 func extractTextFrame(data []byte) string {
 	if len(data) == 0 {
 		return ""
@@ -344,7 +339,6 @@ func extractTextFrame(data []byte) string {
 	}
 }
 
-// decodeUTF16 decodes UTF-16 with BOM
 func decodeUTF16(data []byte) string {
 	if len(data) < 2 {
 		return ""
@@ -362,12 +356,10 @@ func decodeUTF16(data []byte) string {
 	return decodeUTF16Data(data, littleEndian)
 }
 
-// decodeUTF16BE decodes UTF-16 Big Endian
 func decodeUTF16BE(data []byte) string {
 	return decodeUTF16Data(data, false)
 }
 
-// decodeUTF16Data decodes UTF-16 data
 func decodeUTF16Data(data []byte, littleEndian bool) string {
 	if len(data) < 2 {
 		return ""
@@ -389,13 +381,11 @@ func decodeUTF16Data(data []byte, littleEndian bool) string {
 	return string(runes)
 }
 
-// cleanGenre removes ID3 genre number format like "(17)" or "(17)Rock"
 func cleanGenre(genre string) string {
 	if len(genre) == 0 {
 		return ""
 	}
 
-	// Handle "(17)" or "(17)Rock" format
 	if genre[0] == '(' {
 		end := strings.Index(genre, ")")
 		if end > 0 {
@@ -411,7 +401,6 @@ func cleanGenre(genre string) string {
 	return genre
 }
 
-// parseTrackNumber extracts track number from "1/10" or "1" format
 func parseTrackNumber(s string) int {
 	s = strings.TrimSpace(s)
 	if idx := strings.Index(s, "/"); idx > 0 {
@@ -421,7 +410,6 @@ func parseTrackNumber(s string) int {
 	return num
 }
 
-// removeUnsync removes ID3 unsynchronization (0xFF 0x00 -> 0xFF)
 func removeUnsync(data []byte) []byte {
 	if len(data) == 0 {
 		return data
@@ -437,7 +425,6 @@ func removeUnsync(data []byte) []byte {
 	return out
 }
 
-// extendedHeaderSize returns the total number of bytes to skip for the extended header
 func extendedHeaderSize(data []byte, version byte) int {
 	if len(data) < 4 {
 		return 0
@@ -463,7 +450,6 @@ func extendedHeaderSize(data []byte, version byte) int {
 	return 0
 }
 
-// syncsafeToInt decodes a 4-byte syncsafe integer
 func syncsafeToInt(b []byte) int {
 	if len(b) < 4 {
 		return 0
@@ -471,7 +457,6 @@ func syncsafeToInt(b []byte) int {
 	return int(b[0])<<21 | int(b[1])<<14 | int(b[2])<<7 | int(b[3])
 }
 
-// firstTextValue returns the first value in a null-separated text list
 func firstTextValue(s string) string {
 	if idx := strings.IndexByte(s, 0); idx >= 0 {
 		return s[:idx]
@@ -479,7 +464,6 @@ func firstTextValue(s string) string {
 	return s
 }
 
-// GetMP3Quality reads MP3 audio quality info
 func GetMP3Quality(filePath string) (*MP3Quality, error) {
 	file, err := os.Open(filePath)
 	if err != nil {
@@ -731,7 +715,6 @@ func detectOggStreamType(packets [][]byte) oggStreamType {
 	return oggStreamUnknown
 }
 
-// parseVorbisComments parses Vorbis comment block
 func parseVorbisComments(data []byte, metadata *AudioMetadata) {
 	if len(data) < 4 {
 		return
@@ -807,7 +790,6 @@ func parseVorbisComments(data []byte, metadata *AudioMetadata) {
 	}
 }
 
-// GetOggQuality reads Ogg/Opus audio quality info
 func GetOggQuality(filePath string) (*OggQuality, error) {
 	file, err := os.Open(filePath)
 	if err != nil {
@@ -906,7 +888,6 @@ var id3v1Genres = []string{
 // Cover Art Extraction
 // =============================================================================
 
-// extractMP3CoverArt extracts cover art from MP3 file (APIC frame)
 func extractMP3CoverArt(filePath string) ([]byte, string, error) {
 	file, err := os.Open(filePath)
 	if err != nil {
@@ -976,7 +957,6 @@ func extractMP3CoverArt(filePath string) ([]byte, string, error) {
 	return nil, "", fmt.Errorf("no cover art found")
 }
 
-// parseAPICFrame parses APIC frame data
 func parseAPICFrame(data []byte, version byte) ([]byte, string) {
 	if len(data) < 4 {
 		return nil, ""
@@ -988,7 +968,6 @@ func parseAPICFrame(data []byte, version byte) ([]byte, string) {
 
 	var mimeType string
 	if version == 2 {
-		// ID3v2.2: 3-byte image format (JPG, PNG)
 		if pos+3 > len(data) {
 			return nil, ""
 		}
@@ -1003,7 +982,6 @@ func parseAPICFrame(data []byte, version byte) ([]byte, string) {
 			mimeType = "image/jpeg"
 		}
 	} else {
-		// ID3v2.3/2.4: null-terminated MIME string
 		end := pos
 		for end < len(data) && data[end] != 0 {
 			end++
@@ -1018,15 +996,12 @@ func parseAPICFrame(data []byte, version byte) ([]byte, string) {
 
 	pos++
 
-	// Skip description (null-terminated, may be UTF-16)
 	if encoding == 0 || encoding == 3 {
-		// ISO-8859-1 or UTF-8
 		for pos < len(data) && data[pos] != 0 {
 			pos++
 		}
 		pos++
 	} else {
-		// UTF-16: look for double null
 		for pos+1 < len(data) {
 			if data[pos] == 0 && data[pos+1] == 0 {
 				pos += 2
@@ -1043,7 +1018,6 @@ func parseAPICFrame(data []byte, version byte) ([]byte, string) {
 	return data[pos:], mimeType
 }
 
-// extractOggCoverArt extracts cover art from Ogg/Opus file (METADATA_BLOCK_PICTURE)
 func extractOggCoverArt(filePath string) ([]byte, string, error) {
 	file, err := os.Open(filePath)
 	if err != nil {
@@ -1087,7 +1061,6 @@ func extractOggCoverArt(filePath string) ([]byte, string, error) {
 	return nil, "", fmt.Errorf("no cover art found")
 }
 
-// extractPictureFromVorbisComments looks for METADATA_BLOCK_PICTURE in Vorbis comments
 func extractPictureFromVorbisComments(data []byte) ([]byte, string) {
 	if len(data) < 8 {
 		return nil, ""
@@ -1109,13 +1082,12 @@ func extractPictureFromVorbisComments(data []byte) ([]byte, string) {
 		return nil, ""
 	}
 
-	// Look for METADATA_BLOCK_PICTURE
 	for i := uint32(0); i < commentCount && i < 100; i++ {
 		var commentLen uint32
 		if err := binary.Read(reader, binary.LittleEndian, &commentLen); err != nil {
 			break
 		}
-		if commentLen > 10000000 { // 10MB sanity check
+		if commentLen > 10000000 {
 			break
 		}
 
@@ -1126,7 +1098,6 @@ func extractPictureFromVorbisComments(data []byte) ([]byte, string) {
 
 		key := "METADATA_BLOCK_PICTURE="
 		if len(comment) > len(key) && strings.ToUpper(string(comment[:len(key)])) == key {
-			// Base64-encoded FLAC picture block
 			b64Data := comment[len(key):]
 			decoded := make([]byte, base64StdDecodeLen(len(b64Data)))
 			n, err := base64StdDecode(decoded, b64Data)
@@ -1145,7 +1116,6 @@ func extractPictureFromVorbisComments(data []byte) ([]byte, string) {
 	return nil, ""
 }
 
-// parseFLACPictureBlock parses FLAC PICTURE metadata block format
 func parseFLACPictureBlock(data []byte) ([]byte, string) {
 	if len(data) < 32 {
 		return nil, ""

go_backend/exports.go

@@ -735,7 +735,6 @@ func SearchDeezerAll(query string, trackLimit, artistLimit int, filter string) (
 	return string(jsonBytes), nil
 }
 
-// GetDeezerMetadata fetches metadata from Deezer URL or ID
 func GetDeezerMetadata(resourceType, resourceID string) (string, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
@@ -834,8 +833,6 @@ func SearchDeezerByISRC(isrc string) (string, error) {
 	return string(jsonBytes), nil
 }
 
-// ConvertSpotifyToDeezer converts a Spotify track/album ID to Deezer and fetches metadata
-// Useful when Spotify API is rate limited
 func ConvertSpotifyToDeezer(resourceType, spotifyID string) (string, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
@@ -885,7 +882,6 @@ func ConvertSpotifyToDeezer(resourceType, spotifyID string) (string, error) {
 	return "", fmt.Errorf("Spotify to Deezer conversion only supported for tracks and albums. Please search by name for %s", resourceType)
 }
 
-// GetSpotifyMetadataWithDeezerFallback tries Spotify first, falls back to Deezer on rate limit
 func GetSpotifyMetadataWithDeezerFallback(spotifyURL string) (string, error) {
 	ctx, cancel := context.WithTimeout(context.Background(), 30*time.Second)
 	defer cancel()
@@ -942,7 +938,6 @@ func CheckAvailabilityFromDeezerID(deezerTrackID string) (string, error) {
 	return string(jsonBytes), nil
 }
 
-// CheckAvailabilityByPlatformID checks track availability using any platform as source
 func CheckAvailabilityByPlatformID(platform, entityType, entityID string) (string, error) {
 	client := NewSongLinkClient()
 	availability, err := client.CheckAvailabilityByPlatform(platform, entityType, entityID)

go_backend/extension_manager.go

@@ -47,7 +47,7 @@ type LoadedExtension struct {
 	ID        string             `json:"id"`
 	Manifest  *ExtensionManifest `json:"manifest"`
 	VM        *goja.Runtime      `json:"-"`
-	VMMu      sync.Mutex         `json:"-"` // Mutex to prevent concurrent VM access
+	VMMu      sync.Mutex         `json:"-"`
 	Enabled   bool               `json:"enabled"`
 	Error     string             `json:"error,omitempty"`
 	DataDir   string             `json:"data_dir"`
@@ -58,8 +58,8 @@ type LoadedExtension struct {
 type ExtensionManager struct {
 	mu            sync.RWMutex
 	extensions    map[string]*LoadedExtension
-	extensionsDir string // Base directory for extensions
+	extensionsDir string
-	dataDir       string // Base directory for extension data
+	dataDir       string
 }
 
 var (
@@ -98,7 +98,6 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
 	}
 
-	// Open the zip file
 	zipReader, err := zip.OpenReader(filePath)
 	if err != nil {
 		return nil, fmt.Errorf("Cannot open extension file. The file may be corrupted or not a valid extension package")
@@ -221,7 +220,6 @@ func (m *ExtensionManager) LoadExtensionFromFile(filePath string) (*LoadedExtens
 		SourceDir: extDir,
 	}
 
-	// Initialize Goja VM
 	if err := m.initializeVM(ext); err != nil {
 		ext.Error = err.Error()
 		ext.Enabled = false
@@ -268,13 +266,11 @@ func (m *ExtensionManager) initializeVM(ext *LoadedExtension) error {
 		return goja.Undefined()
 	})
 
-	// Run the extension code
 	_, err = vm.RunString(string(jsCode))
 	if err != nil {
 		return fmt.Errorf("failed to execute extension code: %w", err)
 	}
 
-	// Verify extension was registered
 	if registeredExtension == nil || goja.IsUndefined(registeredExtension) {
 		return fmt.Errorf("extension did not call registerExtension()")
 	}
@@ -291,9 +287,7 @@ func (m *ExtensionManager) UnloadExtension(extensionID string) error {
 		return fmt.Errorf("Extension not found")
 	}
 
-	// Call cleanup if VM is initialized
 	if ext.VM != nil {
-		// Try to call cleanup function
 		cleanup, err := ext.VM.RunString("typeof extension !== 'undefined' && typeof extension.cleanup === 'function' ? extension.cleanup() : null")
 		if err != nil {
 			GoLog("[Extension] Error calling cleanup for %s: %v\n", extensionID, err)
@@ -302,7 +296,6 @@ func (m *ExtensionManager) UnloadExtension(extensionID string) error {
 		}
 	}
 
-	// Remove from registry
 	delete(m.extensions, extensionID)
 	GoLog("[Extension] Unloaded extension: %s\n", extensionID)
 
@@ -343,7 +336,6 @@ func (m *ExtensionManager) SetExtensionEnabled(extensionID string, enabled bool)
 	ext.Enabled = enabled
 	GoLog("[Extension] %s %s\n", extensionID, map[bool]string{true: "enabled", false: "disabled"}[enabled])
 
-	// Persist enabled state to settings store
 	store := GetExtensionSettingsStore()
 	if err := store.Set(extensionID, "_enabled", enabled); err != nil {
 		GoLog("[Extension] Failed to persist enabled state for %s: %v\n", extensionID, err)
@@ -438,7 +430,6 @@ func (m *ExtensionManager) loadExtensionFromDirectory(dirPath string) (*LoadedEx
 		}
 	}
 
-	// Initialize Goja VM
 	if err := m.initializeVM(ext); err != nil {
 		ext.Error = err.Error()
 		ext.Enabled = false
@@ -457,12 +448,10 @@ func (m *ExtensionManager) RemoveExtension(extensionID string) error {
 		return err
 	}
 
-	// Unload first
 	if err := m.UnloadExtension(extensionID); err != nil {
 		return err
 	}
 
-	// Remove source directory
 	if ext.SourceDir != "" {
 		if err := os.RemoveAll(ext.SourceDir); err != nil {
 			GoLog("[Extension] Warning: failed to remove source dir: %v\n", err)
@@ -484,7 +473,6 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
 	}
 
-	// Open the zip file
 	zipReader, err := zip.OpenReader(filePath)
 	if err != nil {
 		return nil, fmt.Errorf("Cannot open extension file. The file may be corrupted or not a valid extension package")
@@ -548,11 +536,9 @@ func (m *ExtensionManager) UpgradeExtension(filePath string) (*LoadedExtension,
 	extDir := existing.SourceDir
 	wasEnabled := existing.Enabled
 
-	// Cleanup and unload existing extension
 	m.CleanupExtension(existing.ID)
 	m.UnloadExtension(existing.ID)
 
-	// Remove old source files but keep data directory
 	if extDir != "" {
 		if err := os.RemoveAll(extDir); err != nil {
 			GoLog("[Extension] Warning: failed to remove old source dir: %v\n", err)
@@ -634,11 +620,11 @@ type ExtensionUpgradeInfo struct {
 func (m *ExtensionManager) checkExtensionUpgradeInternal(filePath string) (*ExtensionUpgradeInfo, error) {
 	// Validate file extension
 	if !strings.HasSuffix(strings.ToLower(filePath), ".spotiflac-ext") {
-		return nil, fmt.Errorf("Invalid file format")
+		return nil, fmt.Errorf("Invalid file format. Please select a .spotiflac-ext file")
 	}
 
-	// Open the zip file
 	zipReader, err := zip.OpenReader(filePath)
+
 	if err != nil {
 		return nil, fmt.Errorf("Cannot open extension file")
 	}

go_backend/extension_manifest.go

@@ -175,7 +175,6 @@ func (m *ExtensionManifest) Validate() error {
 		}
 	}
 
-	// Validate settings if present
 	for i, setting := range m.Settings {
 		if strings.TrimSpace(setting.Key) == "" {
 			return &ManifestValidationError{
@@ -236,7 +235,7 @@ func (m *ExtensionManifest) IsDomainAllowed(domain string) bool {
 		}
 		// Support wildcard subdomains (e.g., *.example.com)
 		if strings.HasPrefix(allowed, "*.") {
-			suffix := allowed[1:] // Remove the *
+			suffix := allowed[1:]
 			if strings.HasSuffix(domain, suffix) {
 				return true
 			}
@@ -269,7 +268,6 @@ func (m *ExtensionManifest) MatchesURL(urlStr string) bool {
 	urlStr = strings.ToLower(strings.TrimSpace(urlStr))
 	for _, pattern := range m.URLHandler.Patterns {
 		pattern = strings.ToLower(strings.TrimSpace(pattern))
-		// Check if URL contains the pattern (host match)
 		if strings.Contains(urlStr, pattern) {
 			return true
 		}

go_backend/extension_runtime.go

@@ -106,7 +106,6 @@ func NewExtensionRuntime(ext *LoadedExtension) *ExtensionRuntime {
 		Timeout: 30 * time.Second,
 		Jar:     jar,
 		CheckRedirect: func(req *http.Request, via []*http.Request) error {
-			// Validate redirect target domain against allowed domains
 			if req.URL.Scheme != "https" {
 				GoLog("[Extension:%s] Redirect blocked: non-https scheme '%s'\n", ext.ID, req.URL.Scheme)
 				return fmt.Errorf("redirect blocked: only https is allowed")
@@ -125,7 +124,6 @@ func NewExtensionRuntime(ext *LoadedExtension) *ExtensionRuntime {
 				GoLog("[Extension:%s] Redirect blocked: private IP '%s'\n", ext.ID, domain)
 				return &RedirectBlockedError{Domain: domain, IsPrivate: true}
 			}
-			// Default redirect limit (10)
 			if len(via) >= 10 {
 				return http.ErrUseLastResponse
 			}
@@ -227,7 +225,6 @@ func (r *ExtensionRuntime) SetSettings(settings map[string]interface{}) {
 func (r *ExtensionRuntime) RegisterAPIs(vm *goja.Runtime) {
 	r.vm = vm
 
-	// HTTP client (sandboxed to allowed domains)
 	httpObj := vm.NewObject()
 	httpObj.Set("get", r.httpGet)
 	httpObj.Set("post", r.httpPost)
@@ -264,7 +261,6 @@ func (r *ExtensionRuntime) RegisterAPIs(vm *goja.Runtime) {
 	authObj.Set("exchangeCodeWithPKCE", r.authExchangeCodeWithPKCE)
 	vm.Set("auth", authObj)
 
-	// File operations (sandboxed)
 	fileObj := vm.NewObject()
 	fileObj.Set("download", r.fileDownload)
 	fileObj.Set("exists", r.fileExists)
@@ -282,7 +278,6 @@ func (r *ExtensionRuntime) RegisterAPIs(vm *goja.Runtime) {
 	ffmpegObj.Set("convert", r.ffmpegConvert)
 	vm.Set("ffmpeg", ffmpegObj)
 
-	// Track matching API
 	matchingObj := vm.NewObject()
 	matchingObj.Set("compareStrings", r.matchingCompareStrings)
 	matchingObj.Set("compareDuration", r.matchingCompareDuration)

go_backend/extension_runtime_auth.go

@@ -121,7 +121,6 @@ func (r *ExtensionRuntime) authClear(call goja.FunctionCall) goja.Value {
 	return r.vm.ToValue(true)
 }
 
-// authIsAuthenticated checks if extension has valid auth
 func (r *ExtensionRuntime) authIsAuthenticated(call goja.FunctionCall) goja.Value {
 	extensionAuthStateMu.RLock()
 	defer extensionAuthStateMu.RUnlock()
@@ -194,7 +193,6 @@ func generatePKCEChallenge(verifier string) string {
 }
 
 func (r *ExtensionRuntime) authGeneratePKCE(call goja.FunctionCall) goja.Value {
-	// Default length is 64 characters
 	length := 64
 	if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
 		if l, ok := call.Arguments[0].Export().(float64); ok && l >= 43 && l <= 128 {
@@ -247,9 +245,7 @@ func (r *ExtensionRuntime) authGetPKCE(call goja.FunctionCall) goja.Value {
 	})
 }
 
-// authStartOAuthWithPKCE is a high-level helper that generates PKCE and opens OAuth URL
 // config: { authUrl, clientId, redirectUri, scope, extraParams }
-// Returns: { success, authUrl, pkce: { verifier, challenge } }
 func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.Value {
 	if len(call.Arguments) < 1 {
 		return r.vm.ToValue(map[string]interface{}{
@@ -267,7 +263,6 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 		})
 	}
 
-	// Required fields
 	authURL, _ := config["authUrl"].(string)
 	clientID, _ := config["clientId"].(string)
 	redirectURI, _ := config["redirectUri"].(string)
@@ -279,11 +274,9 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 		})
 	}
 
-	// Optional fields
 	scope, _ := config["scope"].(string)
 	extraParams, _ := config["extraParams"].(map[string]interface{})
 
-	// Generate PKCE
 	verifier, err := generatePKCEVerifier(64)
 	if err != nil {
 		return r.vm.ToValue(map[string]interface{}{
@@ -293,7 +286,6 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 	}
 	challenge := generatePKCEChallenge(verifier)
 
-	// Store PKCE in auth state
 	extensionAuthStateMu.Lock()
 	state, exists := extensionAuthState[r.extensionID]
 	if !exists {
@@ -302,10 +294,9 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 	}
 	state.PKCEVerifier = verifier
 	state.PKCEChallenge = challenge
-	state.AuthCode = "" // Clear any previous auth code
+	state.AuthCode = ""
 	extensionAuthStateMu.Unlock()
 
-	// Build OAuth URL with PKCE parameters
 	parsedURL, err := url.Parse(authURL)
 	if err != nil {
 		return r.vm.ToValue(map[string]interface{}{
@@ -325,7 +316,6 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 		query.Set("scope", scope)
 	}
 
-	// Add extra params
 	for k, v := range extraParams {
 		query.Set(k, fmt.Sprintf("%v", v))
 	}
@@ -333,7 +323,6 @@ func (r *ExtensionRuntime) authStartOAuthWithPKCE(call goja.FunctionCall) goja.V
 	parsedURL.RawQuery = query.Encode()
 	fullAuthURL := parsedURL.String()
 
-	// Store pending auth request for Flutter
 	pendingAuthRequestsMu.Lock()
 	pendingAuthRequests[r.extensionID] = &PendingAuthRequest{
 		ExtensionID: r.extensionID,

go_backend/extension_runtime_file.go

@@ -75,7 +75,6 @@ func isPathWithinBase(baseDir, targetPath string) bool {
 }
 
 func (r *ExtensionRuntime) validatePath(path string) (string, error) {
-	// Check if extension has file permission
 	if !r.manifest.Permissions.File {
 		return "", fmt.Errorf("file access denied: extension does not have 'file' permission")
 	}

go_backend/extension_runtime_http.go

@@ -38,7 +38,6 @@ func (r *ExtensionRuntime) validateDomain(urlStr string) error {
 		return fmt.Errorf("invalid URL: hostname is required")
 	}
 
-	// Block private/local network access (SSRF protection)
 	if isPrivateIP(domain) {
 		return fmt.Errorf("network access denied: private/local network '%s' not allowed", domain)
 	}

go_backend/extension_runtime_matching.go

@@ -9,7 +9,6 @@ import (
 
 // ==================== Track Matching API ====================
 
-// matchingCompareStrings compares two strings with fuzzy matching
 func (r *ExtensionRuntime) matchingCompareStrings(call goja.FunctionCall) goja.Value {
 	if len(call.Arguments) < 2 {
 		return r.vm.ToValue(0.0)
@@ -22,12 +21,10 @@ func (r *ExtensionRuntime) matchingCompareStrings(call goja.FunctionCall) goja.V
 		return r.vm.ToValue(1.0)
 	}
 
-	// Calculate Levenshtein distance-based similarity
 	similarity := calculateStringSimilarity(str1, str2)
 	return r.vm.ToValue(similarity)
 }
 
-// matchingCompareDuration compares two durations with tolerance
 func (r *ExtensionRuntime) matchingCompareDuration(call goja.FunctionCall) goja.Value {
 	if len(call.Arguments) < 2 {
 		return r.vm.ToValue(false)
@@ -36,8 +33,7 @@ func (r *ExtensionRuntime) matchingCompareDuration(call goja.FunctionCall) goja.
 	dur1 := int(call.Arguments[0].ToInteger())
 	dur2 := int(call.Arguments[1].ToInteger())
 
-	// Default tolerance: 3 seconds
+	tolerance := 3000
-	tolerance := 3000 // milliseconds
 	if len(call.Arguments) > 2 && !goja.IsUndefined(call.Arguments[2]) {
 		tolerance = int(call.Arguments[2].ToInteger())
 	}
@@ -50,7 +46,6 @@ func (r *ExtensionRuntime) matchingCompareDuration(call goja.FunctionCall) goja.
 	return r.vm.ToValue(diff <= tolerance)
 }
 
-// matchingNormalizeString normalizes a string for comparison
 func (r *ExtensionRuntime) matchingNormalizeString(call goja.FunctionCall) goja.Value {
 	if len(call.Arguments) < 1 {
 		return r.vm.ToValue("")
@@ -61,7 +56,6 @@ func (r *ExtensionRuntime) matchingNormalizeString(call goja.FunctionCall) goja.
 	return r.vm.ToValue(normalized)
 }
 
-// calculateStringSimilarity calculates similarity between two strings (0-1)
 func calculateStringSimilarity(s1, s2 string) float64 {
 	if len(s1) == 0 && len(s2) == 0 {
 		return 1.0
@@ -70,7 +64,6 @@ func calculateStringSimilarity(s1, s2 string) float64 {
 		return 0.0
 	}
 
-	// Use Levenshtein distance
 	distance := levenshteinDistance(s1, s2)
 	maxLen := len(s1)
 	if len(s2) > maxLen {
@@ -80,7 +73,6 @@ func calculateStringSimilarity(s1, s2 string) float64 {
 	return 1.0 - float64(distance)/float64(maxLen)
 }
 
-// levenshteinDistance calculates the Levenshtein distance between two strings
 func levenshteinDistance(s1, s2 string) int {
 	if len(s1) == 0 {
 		return len(s2)
@@ -89,7 +81,6 @@ func levenshteinDistance(s1, s2 string) int {
 		return len(s1)
 	}
 
-	// Create matrix
 	matrix := make([][]int, len(s1)+1)
 	for i := range matrix {
 		matrix[i] = make([]int, len(s2)+1)
@@ -99,7 +90,6 @@ func levenshteinDistance(s1, s2 string) int {
 		matrix[0][j] = j
 	}
 
-	// Fill matrix
 	for i := 1; i <= len(s1); i++ {
 		for j := 1; j <= len(s2); j++ {
 			cost := 1
@@ -107,9 +97,9 @@ func levenshteinDistance(s1, s2 string) int {
 				cost = 0
 			}
 			matrix[i][j] = min(
-				matrix[i-1][j]+1,      // deletion
+				matrix[i-1][j]+1,
-				matrix[i][j-1]+1,      // insertion
+				matrix[i][j-1]+1,
-				matrix[i-1][j-1]+cost, // substitution
+				matrix[i-1][j-1]+cost,
 			)
 		}
 	}
@@ -117,12 +107,9 @@ func levenshteinDistance(s1, s2 string) int {
 	return matrix[len(s1)][len(s2)]
 }
 
-// normalizeStringForMatching normalizes a string for comparison
 func normalizeStringForMatching(s string) string {
-	// Convert to lowercase
 	s = strings.ToLower(s)
 
-	// Remove common suffixes/prefixes
 	suffixes := []string{
 		" (remastered)", " (remaster)", " - remastered", " - remaster",
 		" (deluxe)", " (deluxe edition)", " - deluxe", " - deluxe edition",
@@ -136,7 +123,6 @@ func normalizeStringForMatching(s string) string {
 		}
 	}
 
-	// Remove special characters
 	var result strings.Builder
 	for _, r := range s {
 		if (r >= 'a' && r <= 'z') || (r >= '0' && r <= '9') || r == ' ' {
@@ -144,7 +130,6 @@ func normalizeStringForMatching(s string) string {
 		}
 	}
 
-	// Collapse multiple spaces
 	s = strings.Join(strings.Fields(result.String()), " ")
 
 	return strings.TrimSpace(s)

go_backend/extension_runtime_polyfills.go

@@ -25,14 +25,11 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 	}
 
 	urlStr := call.Arguments[0].String()
-
-	// Validate domain
 	if err := r.validateDomain(urlStr); err != nil {
 		GoLog("[Extension:%s] fetch blocked: %v\n", r.extensionID, err)
 		return r.createFetchError(err.Error())
 	}
 
-	// Parse options
 	method := "GET"
 	var bodyStr string
 	headers := make(map[string]string)
@@ -84,7 +81,6 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 	for k, v := range headers {
 		req.Header.Set(k, v)
 	}
-	// Set defaults if not provided
 	if req.Header.Get("User-Agent") == "" {
 		req.Header.Set("User-Agent", "SpotiFLAC-Extension/1.0")
 	}
@@ -112,7 +108,6 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 		}
 	}
 
-	// Create Response object (browser-compatible)
 	responseObj := r.vm.NewObject()
 	responseObj.Set("ok", resp.StatusCode >= 200 && resp.StatusCode < 300)
 	responseObj.Set("status", resp.StatusCode)
@@ -136,7 +131,6 @@ func (r *ExtensionRuntime) fetchPolyfill(call goja.FunctionCall) goja.Value {
 	})
 
 	responseObj.Set("arrayBuffer", func(call goja.FunctionCall) goja.Value {
-		// Return as array of bytes
 		byteArray := make([]interface{}, len(body))
 		for i, b := range body {
 			byteArray[i] = int(b)
@@ -171,7 +165,6 @@ func (r *ExtensionRuntime) atobPolyfill(call goja.FunctionCall) goja.Value {
 	input := call.Arguments[0].String()
 	decoded, err := base64.StdEncoding.DecodeString(input)
 	if err != nil {
-		// Try URL-safe base64
 		decoded, err = base64.URLEncoding.DecodeString(input)
 		if err != nil {
 			GoLog("[Extension:%s] atob decode error: %v\n", r.extensionID, err)
@@ -192,7 +185,6 @@ func (r *ExtensionRuntime) btoaPolyfill(call goja.FunctionCall) goja.Value {
 
 // registerTextEncoderDecoder registers TextEncoder and TextDecoder classes
 func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
-	// TextEncoder constructor
 	vm.Set("TextEncoder", func(call goja.ConstructorCall) *goja.Object {
 		encoder := call.This
 		encoder.Set("encoding", "utf-8")
@@ -204,7 +196,6 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 			input := call.Arguments[0].String()
 			bytes := []byte(input)
 
-			// Return as array (Uint8Array-like)
 			result := make([]interface{}, len(bytes))
 			for i, b := range bytes {
 				result[i] = int(b)
@@ -227,11 +218,9 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 		return nil
 	})
 
-	// TextDecoder constructor
 	vm.Set("TextDecoder", func(call goja.ConstructorCall) *goja.Object {
 		decoder := call.This
 
-		// Get encoding from arguments (default: utf-8)
 		encoding := "utf-8"
 		if len(call.Arguments) > 0 && !goja.IsUndefined(call.Arguments[0]) {
 			encoding = call.Arguments[0].String()
@@ -245,7 +234,6 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 				return vm.ToValue("")
 			}
 
-			// Handle different input types
 			input := call.Arguments[0].Export()
 			var bytes []byte
 
@@ -265,7 +253,6 @@ func (r *ExtensionRuntime) registerTextEncoderDecoder(vm *goja.Runtime) {
 					}
 				}
 			case string:
-				// Already a string, just return it
 				return vm.ToValue(v)
 			default:
 				return vm.ToValue("")
@@ -289,7 +276,6 @@ func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {
 
 		urlStr := call.Arguments[0].String()
 
-		// Handle relative URLs with base
 		if len(call.Arguments) > 1 && !goja.IsUndefined(call.Arguments[1]) {
 			baseStr := call.Arguments[1].String()
 			baseURL, err := url.Parse(baseStr)
@@ -446,10 +432,6 @@ func (r *ExtensionRuntime) registerURLClass(vm *goja.Runtime) {
 // registerJSONGlobal ensures JSON global is properly set up
 func (r *ExtensionRuntime) registerJSONGlobal(vm *goja.Runtime) {
 	// JSON is already built-in to Goja, but we can enhance it
-	// This ensures JSON.parse and JSON.stringify work as expected
-
-	// The built-in JSON object should already work, but let's verify
-	// and add any missing functionality if needed
 	jsonScript := `
 		if (typeof JSON === 'undefined') {
 			var JSON = {

go_backend/extension_settings.go

@@ -15,7 +15,6 @@ type ExtensionSettingsStore struct {
 	settings map[string]map[string]interface{} // extensionID -> settings
 }
 
-// Global settings store
 var (
 	globalSettingsStore     *ExtensionSettingsStore
 	globalSettingsStoreOnce sync.Once
@@ -129,7 +128,6 @@ func (s *ExtensionSettingsStore) GetAll(extensionID string) map[string]interface
 		return make(map[string]interface{})
 	}
 
-	// Return a copy
 	result := make(map[string]interface{})
 	for k, v := range extSettings {
 		result[k] = v
@@ -156,7 +154,6 @@ func (s *ExtensionSettingsStore) SetAll(extensionID string, settings map[string]
 
 	s.settings[extensionID] = settings
 
-	// Persist to disk
 	return s.saveSettings(extensionID, settings)
 }
 
@@ -171,7 +168,6 @@ func (s *ExtensionSettingsStore) Remove(extensionID, key string) error {
 
 	delete(extSettings, key)
 
-	// Persist to disk
 	return s.saveSettings(extensionID, extSettings)
 }
 

go_backend/extension_store.go

@@ -12,7 +12,6 @@ import (
 	"time"
 )
 
-// Extension categories
 const (
 	CategoryMetadata    = "metadata"
 	CategoryDownload    = "download"
@@ -146,7 +145,6 @@ func InitExtensionStore(cacheDir string) *ExtensionStore {
 			cacheDir:    cacheDir,
 			cacheTTL:    cacheTTL,
 		}
-		// Try to load from disk cache
 		extensionStore.loadDiskCache()
 	}
 	return extensionStore
@@ -209,7 +207,6 @@ func (s *ExtensionStore) FetchRegistry(forceRefresh bool) (*StoreRegistry, error
 	s.cacheMu.Lock()
 	defer s.cacheMu.Unlock()
 
-	// Return cached if valid and not forcing refresh
 	if !forceRefresh && s.cache != nil && time.Since(s.cacheTime) < s.cacheTTL {
 		LogDebug("ExtensionStore", "Using cached registry (%d extensions)", len(s.cache.Extensions))
 		return s.cache, nil
@@ -224,7 +221,6 @@ func (s *ExtensionStore) FetchRegistry(forceRefresh bool) (*StoreRegistry, error
 	client := &http.Client{Timeout: 30 * time.Second}
 	resp, err := client.Get(s.registryURL)
 	if err != nil {
-		// Return cached data if available on network error
 		if s.cache != nil {
 			LogWarn("ExtensionStore", "Network error, using cached registry: %v", err)
 			return s.cache, nil

go_backend/extension_test.go

@@ -112,7 +112,6 @@ func TestExtensionRuntime_NetworkSandbox(t *testing.T) {
 
 	runtime := NewExtensionRuntime(ext)
 
-	// Test allowed domains
 	if err := runtime.validateDomain("https://api.allowed.com/path"); err != nil {
 		t.Errorf("Expected api.allowed.com to be allowed, got error: %v", err)
 	}
@@ -121,7 +120,6 @@ func TestExtensionRuntime_NetworkSandbox(t *testing.T) {
 		t.Errorf("Expected sub.wildcard.com to be allowed (wildcard), got error: %v", err)
 	}
 
-	// Test blocked domains
 	if err := runtime.validateDomain("https://blocked.com/path"); err == nil {
 		t.Error("Expected blocked.com to be denied")
 	}
@@ -139,7 +137,7 @@ func TestExtensionRuntime_FileSandbox(t *testing.T) {
 		Manifest: &ExtensionManifest{
 			Name: "test-ext",
 			Permissions: ExtensionPermissions{
-				File: true, // Enable file permission for test
+				File: true,
 			},
 		},
 		DataDir: tempDir,
@@ -147,7 +145,6 @@ func TestExtensionRuntime_FileSandbox(t *testing.T) {
 
 	runtime := NewExtensionRuntime(ext)
 
-	// Test valid path within sandbox
 	validPath, err := runtime.validatePath("test.txt")
 	if err != nil {
 		t.Errorf("Expected relative path to be valid, got error: %v", err)
@@ -156,13 +153,11 @@ func TestExtensionRuntime_FileSandbox(t *testing.T) {
 		t.Error("Expected non-empty path")
 	}
 
-	// Test path traversal attack
 	_, err = runtime.validatePath("../../../etc/passwd")
 	if err == nil {
 		t.Error("Expected path traversal to be blocked")
 	}
 
-	// Test nested path within sandbox (should be allowed)
 	nestedPath, err := runtime.validatePath("subdir/file.txt")
 	if err != nil {
 		t.Errorf("Expected nested path to be valid, got error: %v", err)
@@ -171,26 +166,23 @@ func TestExtensionRuntime_FileSandbox(t *testing.T) {
 		t.Error("Expected non-empty nested path")
 	}
 
-	// Test absolute path should be blocked (security fix)
-	// Use platform-appropriate absolute path
 	var absPath string
 	if filepath.IsAbs("C:\\Windows\\System32") {
-		absPath = "C:\\Windows\\System32\\test.txt" // Windows
+		absPath = "C:\\Windows\\System32\\test.txt"
 	} else {
-		absPath = "/etc/passwd" // Unix
+		absPath = "/etc/passwd"
 	}
 	_, err = runtime.validatePath(absPath)
 	if err == nil {
 		t.Error("Expected absolute path to be blocked")
 	}
 
-	// Test that extension without file permission is blocked
 	extNoFile := &LoadedExtension{
 		ID: "test-ext-no-file",
 		Manifest: &ExtensionManifest{
 			Name: "test-ext-no-file",
 			Permissions: ExtensionPermissions{
-				File: false, // No file permission
+				File: false,
 			},
 		},
 		DataDir: tempDir,
@@ -215,7 +207,6 @@ func TestExtensionRuntime_UtilityFunctions(t *testing.T) {
 	vm := goja.New()
 	runtime.RegisterAPIs(vm)
 
-	// Test base64 encode/decode
 	result, err := vm.RunString(`utils.base64Encode("hello")`)
 	if err != nil {
 		t.Fatalf("base64Encode failed: %v", err)
@@ -232,7 +223,6 @@ func TestExtensionRuntime_UtilityFunctions(t *testing.T) {
 		t.Errorf("Expected 'hello', got '%s'", result.String())
 	}
 
-	// Test MD5
 	result, err = vm.RunString(`utils.md5("hello")`)
 	if err != nil {
 		t.Fatalf("md5 failed: %v", err)
@@ -241,7 +231,6 @@ func TestExtensionRuntime_UtilityFunctions(t *testing.T) {
 		t.Errorf("Expected '5d41402abc4b2a76b9719d911017c592', got '%s'", result.String())
 	}
 
-	// Test JSON parse/stringify
 	result, err = vm.RunString(`utils.stringifyJSON({name: "test", value: 123})`)
 	if err != nil {
 		t.Fatalf("stringifyJSON failed: %v", err)
@@ -267,7 +256,6 @@ func TestExtensionRuntime_SSRFProtection(t *testing.T) {
 
 	runtime := NewExtensionRuntime(ext)
 
-	// Test that private IPs are blocked (SSRF protection)
 	privateIPs := []string{
 		"http://localhost/admin",
 		"http://127.0.0.1/admin",
@@ -285,7 +273,6 @@ func TestExtensionRuntime_SSRFProtection(t *testing.T) {
 		}
 	}
 
-	// Test that allowed public domain still works
 	if err := runtime.validateDomain("https://api.example.com/path"); err != nil {
 		t.Errorf("Expected api.example.com to be allowed, got error: %v", err)
 	}
@@ -296,7 +283,6 @@ func TestIsPrivateIP(t *testing.T) {
 		host     string
 		expected bool
 	}{
-		// Private IPs should be blocked
 		{"localhost", true},
 		{"127.0.0.1", true},
 		{"127.0.0.2", true},
@@ -306,18 +292,17 @@ func TestIsPrivateIP(t *testing.T) {
 		{"172.31.255.255", true},
 		{"192.168.0.1", true},
 		{"192.168.255.255", true},
-		{"169.254.169.254", true}, // AWS metadata
+		{"169.254.169.254", true},
 		{"router.local", true},
 		{"mydevice.local", true},
 
-		// Public IPs should be allowed
 		{"8.8.8.8", false},
 		{"1.1.1.1", false},
 		{"api.example.com", false},
 		{"google.com", false},
-		{"172.15.0.1", false},  // Just outside 172.16-31 range
+		{"172.15.0.1", false},
-		{"172.32.0.1", false},  // Just outside 172.16-31 range
+		{"172.32.0.1", false},
-		{"192.167.0.1", false}, // Not 192.168.x.x
+		{"192.167.0.1", false},
 	}
 
 	for _, tt := range tests {

go_backend/extension_timeout.go

@@ -10,7 +10,6 @@ import (
 	"github.com/dop251/goja"
 )
 
-// JSExecutionError represents an error during JS execution
 type JSExecutionError struct {
 	Message   string
 	IsTimeout bool
@@ -20,8 +19,6 @@ func (e *JSExecutionError) Error() string {
 	return e.Message
 }
 
-// RunWithTimeout executes JavaScript code with a timeout
-// Returns the result value and any error (including timeout)
 func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goja.Value, error) {
 	if timeout <= 0 {
 		timeout = DefaultJSTimeout
@@ -30,22 +27,18 @@ func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goj
 	ctx, cancel := context.WithTimeout(context.Background(), timeout)
 	defer cancel()
 
-	// Channel to receive result
 	type result struct {
 		value goja.Value
 		err   error
 	}
 	resultCh := make(chan result, 1)
 
-	// Track if we've interrupted
 	var interrupted bool
 	var interruptMu sync.Mutex
 
-	// Run script in goroutine
 	go func() {
 		defer func() {
 			if r := recover(); r != nil {
-				// Check if this was our interrupt
 				interruptMu.Lock()
 				wasInterrupted := interrupted
 				interruptMu.Unlock()
@@ -65,22 +58,18 @@ func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goj
 		resultCh <- result{val, err}
 	}()
 
-	// Wait for result or timeout
 	select {
 	case res := <-resultCh:
 		return res.value, res.err
 	case <-ctx.Done():
-		// Timeout - interrupt the VM
 		interruptMu.Lock()
 		interrupted = true
 		interruptMu.Unlock()
 
 		vm.Interrupt("execution timeout")
 
-		// Wait a bit for the goroutine to finish
 		select {
 		case res := <-resultCh:
-			// If we got a result after interrupt, it might be the timeout error
 			if res.err != nil {
 				return nil, res.err
 			}
@@ -89,7 +78,6 @@ func RunWithTimeout(vm *goja.Runtime, script string, timeout time.Duration) (goj
 				IsTimeout: true,
 			}
 		case <-time.After(1 * time.Second):
-			// Force return timeout error
 			return nil, &JSExecutionError{
 				Message:   "execution timeout exceeded (force)",
 				IsTimeout: true,
@@ -109,7 +97,6 @@ func RunWithTimeoutAndRecover(vm *goja.Runtime, script string, timeout time.Dura
 	return result, err
 }
 
-// IsTimeoutError checks if an error is a timeout error
 func IsTimeoutError(err error) bool {
 	if jsErr, ok := err.(*JSExecutionError); ok {
 		return jsErr.IsTimeout

go_backend/httputil.go

@@ -16,7 +16,6 @@ import (
 )
 
 func getRandomUserAgent() string {
-	// Chrome version 120-145 (modern range)
 	chromeVersion := rand.Intn(26) + 120
 	chromeBuild := rand.Intn(1500) + 6000
 	chromePatch := rand.Intn(200) + 100
@@ -118,7 +117,6 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 	requestURL := req.URL.String()
 
 	for attempt := 0; attempt <= config.MaxRetries; attempt++ {
-		// Clone request for retry (body needs to be re-readable)
 		reqCopy := req.Clone(req.Context())
 		reqCopy.Header.Set("User-Agent", getRandomUserAgent())
 
@@ -126,9 +124,7 @@ func DoRequestWithRetry(client *http.Client, req *http.Request, config RetryConf
 		if err != nil {
 			lastErr = err
 
-			// Check for ISP blocking on network errors
 			if CheckAndLogISPBlocking(err, requestURL, "HTTP") {
-				// Don't retry if ISP blocking is detected - it won't help
 				return nil, WrapErrorWithISPCheck(err, requestURL, "HTTP")
 			}
 

go_backend/httputil_utls.go

@@ -35,7 +35,6 @@ func newUTLSTransport() *utlsTransport {
 }
 
 func (t *utlsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
-	// For non-HTTPS, use standard transport
 	if req.URL.Scheme != "https" {
 		return sharedTransport.RoundTrip(req)
 	}
@@ -44,29 +43,24 @@ func (t *utlsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 	port := t.getPort(req.URL)
 	addr := net.JoinHostPort(host, port)
 
-	// Dial TCP connection
 	conn, err := t.dialer.DialContext(req.Context(), "tcp", addr)
 	if err != nil {
 		return nil, err
 	}
 
-	// Create uTLS connection with Chrome fingerprint (supports HTTP/2 ALPN)
 	tlsConn := utls.UClient(conn, &utls.Config{
 		ServerName: host,
-		NextProtos: []string{"h2", "http/1.1"}, // Prefer HTTP/2
+		NextProtos: []string{"h2", "http/1.1"},
 	}, utls.HelloChrome_Auto)
 
-	// Perform TLS handshake
 	if err := tlsConn.Handshake(); err != nil {
 		conn.Close()
 		return nil, err
 	}
 
-	// Check if server supports HTTP/2
 	negotiatedProto := tlsConn.ConnectionState().NegotiatedProtocol
 
 	if negotiatedProto == "h2" {
-		// Use HTTP/2 transport
 		h2Transport := &http2.Transport{
 			DialTLSContext: func(ctx context.Context, network, addr string, cfg *tls.Config) (net.Conn, error) {
 				return tlsConn, nil
@@ -77,7 +71,6 @@ func (t *utlsTransport) RoundTrip(req *http.Request) (*http.Response, error) {
 		return h2Transport.RoundTrip(req)
 	}
 
-	// Fallback to HTTP/1.1
 	transport := &http.Transport{
 		DialTLSContext: func(ctx context.Context, network, addr string) (net.Conn, error) {
 			return tlsConn, nil

go_backend/library_scan.go

@@ -31,7 +31,6 @@ type LibraryScanResult struct {
 	Format      string `json:"format,omitempty"`
 }
 
-// LibraryScanProgress reports progress during scan
 type LibraryScanProgress struct {
 	TotalFiles   int     `json:"total_files"`
 	ScannedFiles int     `json:"scanned_files"`
@@ -50,7 +49,6 @@ var (
 	libraryCoverCacheMu   sync.RWMutex
 )
 
-// supportedAudioFormats lists file extensions we can read metadata from
 var supportedAudioFormats = map[string]bool{
 	".flac": true,
 	".m4a":  true,
@@ -59,15 +57,12 @@ var supportedAudioFormats = map[string]bool{
 	".ogg":  true,
 }
 
-// SetLibraryCoverCacheDir sets the directory to cache extracted cover art
 func SetLibraryCoverCacheDir(cacheDir string) {
 	libraryCoverCacheMu.Lock()
 	libraryCoverCacheDir = cacheDir
 	libraryCoverCacheMu.Unlock()
 }
 
-// ScanLibraryFolder scans a folder recursively for audio files and reads their metadata
-// Returns JSON array of LibraryScanResult
 func ScanLibraryFolder(folderPath string) (string, error) {
 	if folderPath == "" {
 		return "[]", fmt.Errorf("folder path is empty")

go_backend/logbuffer.go

@@ -27,7 +27,6 @@ var (
 	logBufferOnce   sync.Once
 )
 
-// GetLogBuffer returns the singleton log buffer instance
 func GetLogBuffer() *LogBuffer {
 	logBufferOnce.Do(func() {
 		globalLogBuffer = &LogBuffer{
@@ -45,7 +44,6 @@ func (lb *LogBuffer) SetLoggingEnabled(enabled bool) {
 	lb.loggingEnabled = enabled
 }
 
-// IsLoggingEnabled returns whether logging is enabled
 func (lb *LogBuffer) IsLoggingEnabled() bool {
 	lb.mu.RLock()
 	defer lb.mu.RUnlock()
@@ -75,7 +73,6 @@ func (lb *LogBuffer) Add(level, tag, message string) {
 	fmt.Printf("[%s] %s\n", tag, message)
 }
 
-// GetAll returns all log entries as JSON
 func (lb *LogBuffer) GetAll() string {
 	lb.mu.RLock()
 	defer lb.mu.RUnlock()
@@ -99,21 +96,18 @@ func (lb *LogBuffer) getSince(index int) ([]LogEntry, int) {
 	return entries, len(lb.entries)
 }
 
-// Clear clears all log entries
 func (lb *LogBuffer) Clear() {
 	lb.mu.Lock()
 	defer lb.mu.Unlock()
 	lb.entries = lb.entries[:0]
 }
 
-// Count returns the number of log entries
 func (lb *LogBuffer) Count() int {
 	lb.mu.RLock()
 	defer lb.mu.RUnlock()
 	return len(lb.entries)
 }
 
-// Helper functions for logging with different levels
 func LogDebug(tag, format string, args ...interface{}) {
 	GetLogBuffer().Add("DEBUG", tag, fmt.Sprintf(format, args...))
 }
@@ -163,15 +157,10 @@ func GoLog(format string, args ...interface{}) {
 	GetLogBuffer().Add(level, tag, message)
 }
 
-// Exported functions for Flutter
-
-// GetLogs returns all logs as JSON array
 func GetLogs() string {
 	return GetLogBuffer().GetAll()
 }
 
-// GetLogsSince returns logs since the given index
-// Returns JSON: {"logs": [...], "next_index": N}
 func GetLogsSince(index int) string {
 	entries, nextIndex := GetLogBuffer().getSince(index)
 	logsJson, _ := json.Marshal(entries)
@@ -179,17 +168,14 @@ func GetLogsSince(index int) string {
 	return result
 }
 
-// ClearLogs clears all logs
 func ClearLogs() {
 	GetLogBuffer().Clear()
 }
 
-// GetLogCount returns the number of log entries
 func GetLogCount() int {
 	return GetLogBuffer().Count()
 }
 
-// SetLoggingEnabled enables or disables logging from Flutter
 func SetLoggingEnabled(enabled bool) {
 	GetLogBuffer().SetLoggingEnabled(enabled)
 }

go_backend/progress.go

@@ -187,13 +187,13 @@ type ItemProgressWriter struct {
 	writer       interface{ Write([]byte) (int, error) }
 	itemID       string
 	current      int64
-	lastReported int64     // Track last reported bytes for threshold-based updates
+	lastReported int64
-	startTime    time.Time // Track start time for speed calculation
+	startTime    time.Time
-	lastTime     time.Time // Track last update time for speed calculation
+	lastTime     time.Time
-	lastBytes    int64     // Track bytes at last speed calculation
+	lastBytes    int64
 }
 
-const progressUpdateThreshold = 64 * 1024 // Update progress every 64KB
+const progressUpdateThreshold = 64 * 1024
 
 func NewItemProgressWriter(w interface{ Write([]byte) (int, error) }, itemID string) *ItemProgressWriter {
 	now := time.Now()

go_backend/spotify.go

@@ -934,14 +934,14 @@ func (c *SpotifyMetadataClient) randomUserAgent() string {
 	defer c.rngMu.Unlock()
 
 	macMajor := c.rng.Intn(4) + 11
-	macMinor := c.rng.Intn(5) + 4          // 4-8
+	macMinor := c.rng.Intn(5) + 4
-	webkitMajor := c.rng.Intn(7) + 530     // 530-536
+	webkitMajor := c.rng.Intn(7) + 530
-	webkitMinor := c.rng.Intn(7) + 30      // 30-36
+	webkitMinor := c.rng.Intn(7) + 30
-	chromeMajor := c.rng.Intn(25) + 80     // 80-104
+	chromeMajor := c.rng.Intn(25) + 80
-	chromeBuild := c.rng.Intn(1500) + 3000 // 3000-4499
+	chromeBuild := c.rng.Intn(1500) + 3000
-	chromePatch := c.rng.Intn(65) + 60     // 60-124
+	chromePatch := c.rng.Intn(65) + 60
-	safariMajor := c.rng.Intn(7) + 530     // 530-536
+	safariMajor := c.rng.Intn(7) + 530
-	safariMinor := c.rng.Intn(6) + 30      // 30-35
+	safariMinor := c.rng.Intn(6) + 30
 
 	return fmt.Sprintf(
 		"Mozilla/5.0 (Macintosh; Intel Mac OS X 10_%d_%d) AppleWebKit/%d.%d (KHTML, like Gecko) Chrome/%d.0.%d.%d Safari/%d.%d",

go_backend/tidal.go

@@ -317,7 +317,6 @@ func (t *TidalDownloader) SearchTrackByISRC(isrc string) (*TidalTrack, error) {
 		return nil, err
 	}
 
-	// Find exact ISRC match
 	for i := range result.Items {
 		if result.Items[i].ISRC == isrc {
 			return &result.Items[i], nil
@@ -341,7 +340,6 @@ func (t *TidalDownloader) SearchTrackByMetadataWithISRC(trackName, artistName, s
 	// Build search queries - multiple strategies (same as PC version)
 	queries := []string{}
 
-	// Strategy 1: Artist + Track name (original)
 	if artistName != "" && trackName != "" {
 		queries = append(queries, artistName+" "+trackName)
 	}
@@ -584,7 +582,6 @@ type tidalAPIResult struct {
 	duration time.Duration
 }
 
-// Returns the first successful result (supports both v1 and v2 API formats)
 func getDownloadURLParallel(apis []string, trackID int64, quality string) (string, TidalDownloadInfo, error) {
 	if len(apis) == 0 {
 		return "", TidalDownloadInfo{}, fmt.Errorf("no APIs available")

lib/providers/explore_provider.dart

@@ -5,7 +5,6 @@ import 'package:spotiflac_android/providers/extension_provider.dart';
 
 final _log = AppLogger('ExploreProvider');
 
-/// Represents an item in a Spotify home section
 class ExploreItem {
   final String id;
   final String uri;
@@ -50,7 +49,6 @@ class ExploreItem {
   }
 }
 
-/// Represents a section in Spotify home feed
 class ExploreSection {
   final String uri;
   final String title;
@@ -79,7 +77,6 @@ class ExploreSection {
   }
 }
 
-/// State for explore/home feed
 class ExploreState {
   final bool isLoading;
   final String? error;
@@ -114,7 +111,6 @@ class ExploreState {
   }
 }
 
-/// Calculate greeting based on local device time
 String _getLocalGreeting() {
   final hour = DateTime.now().hour;
   if (hour >= 5 && hour < 12) {
@@ -139,7 +135,6 @@ bool _isYTMusicQuickPicksItems(List<ExploreItem> items) {
   return true;
 }
 
-/// Provider for explore/home feed state
 class ExploreNotifier extends Notifier<ExploreState> {
   @override
   ExploreState build() {
@@ -150,7 +145,6 @@ class ExploreNotifier extends Notifier<ExploreState> {
   Future<void> fetchHomeFeed({bool forceRefresh = false}) async {
     _log.i('fetchHomeFeed called, forceRefresh=$forceRefresh');
     
-    // Don't refetch if we have data and it's less than 5 minutes old
     if (!forceRefresh && 
         state.hasContent && 
         state.lastFetched != null &&
@@ -167,11 +161,9 @@ class ExploreNotifier extends Notifier<ExploreState> {
     state = state.copyWith(isLoading: true, error: null);
 
     try {
-      // Find any extension with homeFeed capability
       final extState = ref.read(extensionProvider);
       _log.d('Extensions count: ${extState.extensions.length}');
       
-      // Look for extensions with homeFeed capability (prefer spotify-web)
       Extension? targetExt;
       for (final extension in extState.extensions) {
         if (!extension.enabled || !extension.hasHomeFeed) {
@@ -225,14 +217,11 @@ class ExploreNotifier extends Notifier<ExploreState> {
 
       _log.i('Fetched ${sections.length} sections');
       
-      // Debug: log first section items
       if (sections.isNotEmpty && sections.first.items.isNotEmpty) {
         final firstItem = sections.first.items.first;
         _log.d('First item: name=${firstItem.name}, artists=${firstItem.artists}, type=${firstItem.type}');
       }
 
-      // Always use local device time for greeting to avoid timezone issues
-      // Extension greeting may use wrong timezone (UTC or Spotify account timezone)
       final localGreeting = _getLocalGreeting();
       _log.d('Greeting from extension: $greeting, using local: $localGreeting');
 
@@ -251,15 +240,14 @@ class ExploreNotifier extends Notifier<ExploreState> {
     }
   }
 
-  /// Clear cached data
   void clear() {
     state = const ExploreState();
   }
 
-  /// Refresh home feed
   Future<void> refresh() => fetchHomeFeed(forceRefresh: true);
 }
 
+
 final exploreProvider = NotifierProvider<ExploreNotifier, ExploreState>(() {
   return ExploreNotifier();
 });

lib/providers/extension_provider.dart

@@ -452,7 +452,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     return const ExtensionState();
   }
 
-  /// Initialize the extension system
   Future<void> initialize(String extensionsDir, String dataDir) async {
     if (state.isInitialized) return;
     
@@ -485,7 +484,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
-  /// Refresh the list of installed extensions
   Future<void> refreshExtensions() async {
     try {
       final list = await PlatformBridge.getInstalledExtensions();
@@ -493,7 +491,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
       state = state.copyWith(extensions: extensions);
       _log.d('Loaded ${extensions.length} extensions');
       
-      // Log search behavior for extensions that have it
       for (final ext in extensions) {
         if (ext.searchBehavior != null) {
           _log.d('Extension ${ext.id}: thumbnailRatio=${ext.searchBehavior!.thumbnailRatio}');
@@ -505,6 +502,7 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
+
   void clearError() {
     state = state.copyWith(error: null);
   }
@@ -550,7 +548,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
-  /// Uninstall/remove an extension
   Future<bool> removeExtension(String extensionId) async {
     state = state.copyWith(isLoading: true, error: null);
     
@@ -567,6 +564,7 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
+
   Future<void> setExtensionEnabled(String extensionId, bool enabled) async {
     try {
       await PlatformBridge.setExtensionEnabled(extensionId, enabled);
@@ -603,7 +601,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
-  /// Get settings for an extension
   Future<Map<String, dynamic>> getExtensionSettings(String extensionId) async {
     try {
       return await PlatformBridge.getExtensionSettings(extensionId);
@@ -623,7 +620,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
-  /// Load provider priority order
   Future<void> loadProviderPriority() async {
     try {
       final priority = await PlatformBridge.getProviderPriority();
@@ -633,6 +629,7 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
+
   Future<void> setProviderPriority(List<String> priority) async {
     try {
       await PlatformBridge.setProviderPriority(priority);
@@ -644,7 +641,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
-  /// Load metadata provider priority order
   Future<void> loadMetadataProviderPriority() async {
     try {
       final priority = await PlatformBridge.getMetadataProviderPriority();
@@ -665,7 +661,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
-  /// Cleanup all extensions (call on app close)
   Future<void> cleanup() async {
     try {
       await PlatformBridge.cleanupExtensions();
@@ -683,7 +678,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
   }
 
-  /// Get all enabled extensions
   List<Extension> get enabledExtensions {
     return state.extensions.where((ext) => ext.enabled).toList();
   }
@@ -698,7 +692,6 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     return providers;
   }
 
-  /// Get all metadata providers (built-in + extensions)
   List<String> getAllMetadataProviders() {
     final providers = ['deezer', 'spotify'];
     for (final ext in state.extensions) {
@@ -708,6 +701,7 @@ class ExtensionNotifier extends Notifier<ExtensionState> {
     }
     return providers;
   }
+
   List<Extension> get searchProviders {
     return state.extensions.where((ext) => ext.enabled && ext.hasCustomSearch).toList();
   }

lib/providers/store_provider.dart

@@ -7,8 +7,6 @@ import 'package:spotiflac_android/providers/extension_provider.dart';
 final _log = AppLogger('StoreProvider');
 final RegExp _leadingVersionPrefix = RegExp(r'^v');
 
-/// Compare two semantic version strings
-/// Returns: -1 if v1 < v2, 0 if equal, 1 if v1 > v2
 int compareVersions(String v1, String v2) {
   final parts1 = v1.replaceAll(_leadingVersionPrefix, '').split('.');
   final parts2 = v2.replaceAll(_leadingVersionPrefix, '').split('.');
@@ -25,8 +23,8 @@ int compareVersions(String v1, String v2) {
   return 0;
 }
 
-/// Extension categories
 class StoreCategory {
+
   static const String metadata = 'metadata';
   static const String download = 'download';
   static const String utility = 'utility';
@@ -111,13 +109,13 @@ class StoreExtension {
     );
   }
 
-  /// Check if this extension requires a higher app version than current
   bool get requiresNewerApp {
     if (minAppVersion == null || minAppVersion!.isEmpty) return false;
     return compareVersions(minAppVersion!, AppInfo.version) > 0;
   }
 }
 
+
 class StoreState {
   final List<StoreExtension> extensions;
   final String? selectedCategory;
@@ -164,7 +162,6 @@ class StoreState {
     );
   }
 
-  /// Get filtered extensions based on category and search
   List<StoreExtension> get filteredExtensions {
     var result = extensions;
 
@@ -186,13 +183,11 @@ class StoreState {
     return result;
   }
 
-  /// Count of extensions with updates available
   int get updatesAvailableCount {
     return extensions.where((e) => e.hasUpdate).length;
   }
 }
 
-/// Provider for managing extension store
 class StoreNotifier extends Notifier<StoreState> {
   @override
   StoreState build() {
@@ -215,7 +210,6 @@ class StoreNotifier extends Notifier<StoreState> {
     }
   }
 
-  /// Refresh extensions from store
   Future<void> refresh({bool forceRefresh = false}) async {
     state = state.copyWith(isLoading: true, clearError: true);
 
@@ -240,7 +234,6 @@ class StoreNotifier extends Notifier<StoreState> {
     }
   }
 
-  /// Set search query
   void setSearchQuery(String query) {
     state = state.copyWith(searchQuery: query);
   }
@@ -249,7 +242,6 @@ class StoreNotifier extends Notifier<StoreState> {
     state = state.copyWith(searchQuery: '', clearCategory: true);
   }
 
-  /// Download and install extension
   Future<bool> installExtension(String extensionId, String tempDir, String extensionsDir) async {
     state = state.copyWith(isDownloading: true, downloadingId: extensionId, clearError: true);
 
@@ -275,6 +267,7 @@ class StoreNotifier extends Notifier<StoreState> {
     }
   }
 
+
   Future<bool> updateExtension(String extensionId, String tempDir) async {
     state = state.copyWith(isDownloading: true, downloadingId: extensionId, clearError: true);
 

lib/providers/theme_provider.dart

@@ -3,23 +3,19 @@ import 'package:flutter_riverpod/flutter_riverpod.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 import 'package:spotiflac_android/models/theme_settings.dart';
 
-/// Provider for theme settings state management
 final themeProvider = NotifierProvider<ThemeNotifier, ThemeSettings>(() {
   return ThemeNotifier();
 });
 
-/// Notifier for managing theme settings with persistence
 class ThemeNotifier extends Notifier<ThemeSettings> {
   final Future<SharedPreferences> _prefs = SharedPreferences.getInstance();
 
   @override
   ThemeSettings build() {
-    // Load settings asynchronously on first access
     _loadFromStorage();
     return const ThemeSettings();
   }
 
-  /// Load theme settings from SharedPreferences
   Future<void> _loadFromStorage() async {
     try {
       final prefs = await _prefs;
@@ -39,7 +35,6 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
     }
   }
 
-  /// Save current settings to SharedPreferences
   Future<void> _saveToStorage() async {
     try {
       final prefs = await _prefs;
@@ -52,13 +47,11 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
     }
   }
 
-  /// Set theme mode (light, dark, or system)
   Future<void> setThemeMode(ThemeMode mode) async {
     state = state.copyWith(themeMode: mode);
     await _saveToStorage();
   }
 
-  /// Enable or disable dynamic color from wallpaper
   Future<void> setUseDynamicColor(bool value) async {
     state = state.copyWith(useDynamicColor: value);
     await _saveToStorage();
@@ -70,19 +63,16 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
     await _saveToStorage();
   }
 
-  /// Set seed color from int value
   Future<void> setSeedColorValue(int colorValue) async {
     state = state.copyWith(seedColorValue: colorValue);
     await _saveToStorage();
   }
 
-  /// Enable or disable AMOLED mode (pure black background)
   Future<void> setUseAmoled(bool value) async {
     state = state.copyWith(useAmoled: value);
     await _saveToStorage();
   }
 
-  /// Helper to convert string to ThemeMode
   ThemeMode _themeModeFromString(String? value) {
     if (value == null) return ThemeMode.system;
     return ThemeMode.values.firstWhere(
@@ -91,3 +81,4 @@ class ThemeNotifier extends Notifier<ThemeSettings> {
     );
   }
 }
+

lib/services/palette_service.dart

@@ -9,7 +9,6 @@ class PaletteService {
   static final PaletteService instance = PaletteService._();
   PaletteService._();
 
-  /// Cache for already computed colors
   final Map<String, Color> _colorCache = {};
 
   /// Extract dominant color from a network image URL
@@ -47,7 +46,6 @@ class PaletteService {
     }
   }
 
-  /// Extract dominant color from a local file path
   Future<Color?> extractDominantColorFromFile(String? filePath) async {
     if (filePath == null || filePath.isEmpty) return null;
 
@@ -81,12 +79,10 @@ class PaletteService {
     }
   }
 
-  /// Clear the color cache
   void clearCache() {
     _colorCache.clear();
   }
 
-  /// Get cached color without computing
   Color? getCached(String? imageUrl) {
     if (imageUrl == null) return null;
     return _colorCache[imageUrl];

lib/widgets/settings_group.dart

@@ -43,8 +43,8 @@ class SettingsGroup extends StatelessWidget {
   }
 }
 
-/// A single settings item that can be used inside SettingsGroup
 class SettingsItem extends StatelessWidget {
+
   final IconData? icon;
   final String title;
   final String? subtitle;
@@ -125,8 +125,8 @@ class SettingsItem extends StatelessWidget {
   }
 }
 
-/// A switch settings item for SettingsGroup
 class SettingsSwitchItem extends StatelessWidget {
+
   final IconData? icon;
   final String title;
   final String? subtitle;
@@ -213,8 +213,8 @@ class SettingsSwitchItem extends StatelessWidget {
   }
 }
 
-/// Section header for settings groups
 class SettingsSectionHeader extends StatelessWidget {
+
   final String title;
 
   const SettingsSectionHeader({super.key, required this.title});