Add FLAC lyrics embedding with LRCLIB fallback (#151)
* Update lyrics code * Refactor DownloadFile to use default HTTP client
This commit is contained in:
Sepehr Aroofzade
+219
-3
@@ -6,6 +6,7 @@ import (
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"fmt"
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"io"
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"net/http"
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"net/url"
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"os"
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"path/filepath"
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"regexp"
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@@ -13,6 +14,19 @@ import (
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"time"
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)
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// LRCLibResponse represents the LRCLIB API response
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type LRCLibResponse struct {
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ID int `json:"id"`
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Name string `json:"name"`
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TrackName string `json:"trackName"`
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ArtistName string `json:"artistName"`
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AlbumName string `json:"albumName"`
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Duration float64 `json:"duration"`
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Instrumental bool `json:"instrumental"`
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PlainLyrics string `json:"plainLyrics"`
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SyncedLyrics string `json:"syncedLyrics"`
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}
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// LyricsLine represents a single line of lyrics
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type LyricsLine struct {
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StartTimeMs string `json:"startTimeMs"`
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@@ -60,13 +74,215 @@ func NewLyricsClient() *LyricsClient {
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}
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}
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// FetchLyrics fetches lyrics from the Spotify Lyrics API
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// FetchLyricsWithMetadata fetches lyrics using track name and artist (for LRCLIB fallback)
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func (c *LyricsClient) FetchLyricsWithMetadata(trackName, artistName string) (*LyricsResponse, error) {
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// Try LRCLIB API
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apiURL := fmt.Sprintf("https://lrclib.net/api/get?artist_name=%s&track_name=%s",
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url.QueryEscape(artistName),
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url.QueryEscape(trackName))
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resp, err := c.httpClient.Get(apiURL)
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if err != nil {
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return nil, fmt.Errorf("failed to fetch from LRCLIB: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return nil, fmt.Errorf("LRCLIB returned status %d", resp.StatusCode)
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}
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("failed to read LRCLIB response: %v", err)
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}
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var lrcLibResp LRCLibResponse
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if err := json.Unmarshal(body, &lrcLibResp); err != nil {
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return nil, fmt.Errorf("failed to parse LRCLIB response: %v", err)
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}
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// Convert LRCLIB response to our LyricsResponse format
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return c.convertLRCLibToLyricsResponse(&lrcLibResp), nil
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}
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// convertLRCLibToLyricsResponse converts LRCLIB response to our standard format
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func (c *LyricsClient) convertLRCLibToLyricsResponse(lrcLib *LRCLibResponse) *LyricsResponse {
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resp := &LyricsResponse{
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Error: false,
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SyncType: "LINE_SYNCED",
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Lines: []LyricsLine{},
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}
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// Prefer synced lyrics, fall back to plain
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lyricsText := lrcLib.SyncedLyrics
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if lyricsText == "" {
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lyricsText = lrcLib.PlainLyrics
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resp.SyncType = "UNSYNCED"
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}
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if lyricsText == "" {
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resp.Error = true
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return resp
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}
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// Parse synced lyrics format [mm:ss.xx] text
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lines := strings.Split(lyricsText, "\n")
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for _, line := range lines {
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line = strings.TrimSpace(line)
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if line == "" {
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continue
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}
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// Check if line has timestamp [mm:ss.xx]
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if strings.HasPrefix(line, "[") && len(line) > 10 {
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closeBracket := strings.Index(line, "]")
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if closeBracket > 0 {
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timestamp := line[1:closeBracket]
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words := strings.TrimSpace(line[closeBracket+1:])
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// Convert [mm:ss.xx] to milliseconds
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ms := lrcTimestampToMs(timestamp)
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resp.Lines = append(resp.Lines, LyricsLine{
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StartTimeMs: fmt.Sprintf("%d", ms),
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Words: words,
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})
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continue
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}
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}
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// Plain lyrics line (no timestamp)
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resp.Lines = append(resp.Lines, LyricsLine{
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StartTimeMs: "0",
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Words: line,
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})
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}
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return resp
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}
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// lrcTimestampToMs converts LRC timestamp [mm:ss.xx] to milliseconds
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func lrcTimestampToMs(timestamp string) int64 {
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var minutes, seconds, centiseconds int64
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// Try parsing mm:ss.xx format
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n, _ := fmt.Sscanf(timestamp, "%d:%d.%d", &minutes, &seconds, ¢iseconds)
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if n >= 2 {
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return minutes*60*1000 + seconds*1000 + centiseconds*10
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}
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return 0
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}
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// FetchLyricsFromLRCLibSearch fetches lyrics using LRCLIB search API
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func (c *LyricsClient) FetchLyricsFromLRCLibSearch(trackName, artistName string) (*LyricsResponse, error) {
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query := fmt.Sprintf("%s %s", artistName, trackName)
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apiURL := fmt.Sprintf("https://lrclib.net/api/search?q=%s", url.QueryEscape(query))
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resp, err := c.httpClient.Get(apiURL)
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if err != nil {
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return nil, fmt.Errorf("request failed: %v", err)
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}
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defer resp.Body.Close()
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if resp.StatusCode != 200 {
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return nil, fmt.Errorf("status %d", resp.StatusCode)
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}
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body, err := io.ReadAll(resp.Body)
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if err != nil {
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return nil, fmt.Errorf("read failed: %v", err)
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}
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var results []LRCLibResponse
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if err := json.Unmarshal(body, &results); err != nil {
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return nil, fmt.Errorf("parse failed: %v", err)
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}
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if len(results) == 0 {
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return nil, fmt.Errorf("no results found")
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}
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// Find best match - prefer one with synced lyrics
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var best *LRCLibResponse
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for i := range results {
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if results[i].SyncedLyrics != "" {
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best = &results[i]
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break
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}
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if best == nil && results[i].PlainLyrics != "" {
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best = &results[i]
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}
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}
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if best == nil {
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best = &results[0]
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}
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return c.convertLRCLibToLyricsResponse(best), nil
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}
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// simplifyTrackName removes common suffixes like "(feat. X)", "(Remastered)", etc.
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func simplifyTrackName(name string) string {
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// Remove content in parentheses
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if idx := strings.Index(name, "("); idx > 0 {
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name = strings.TrimSpace(name[:idx])
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}
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// Remove content after " - " (like "From the Motion Picture")
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if idx := strings.Index(name, " - "); idx > 0 {
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name = strings.TrimSpace(name[:idx])
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}
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return name
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}
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// FetchLyricsAllSources tries all sources to get lyrics
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func (c *LyricsClient) FetchLyricsAllSources(spotifyID, trackName, artistName string) (*LyricsResponse, string, error) {
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// 1. Try Spotify API
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if spotifyID != "" {
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resp, err := c.FetchLyrics(spotifyID)
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if err == nil && resp != nil && len(resp.Lines) > 0 {
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return resp, "Spotify", nil
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}
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fmt.Printf(" ↳ Spotify API: %v\n", err)
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}
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// 2. Try LRCLIB exact match
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resp, err := c.FetchLyricsWithMetadata(trackName, artistName)
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if err == nil && resp != nil && !resp.Error && len(resp.Lines) > 0 {
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return resp, "LRCLIB", nil
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}
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fmt.Printf(" ↳ LRCLIB exact: %v\n", err)
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// 3. Try LRCLIB search
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resp, err = c.FetchLyricsFromLRCLibSearch(trackName, artistName)
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if err == nil && resp != nil && !resp.Error && len(resp.Lines) > 0 {
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return resp, "LRCLIB Search", nil
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}
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fmt.Printf(" ↳ LRCLIB search: %v\n", err)
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// 4. Try with simplified track name (remove parentheses, subtitles)
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simplifiedTrack := simplifyTrackName(trackName)
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if simplifiedTrack != trackName {
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fmt.Printf(" ↳ Trying simplified name: %s\n", simplifiedTrack)
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resp, err = c.FetchLyricsWithMetadata(simplifiedTrack, artistName)
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if err == nil && resp != nil && !resp.Error && len(resp.Lines) > 0 {
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return resp, "LRCLIB (simplified)", nil
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}
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resp, err = c.FetchLyricsFromLRCLibSearch(simplifiedTrack, artistName)
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if err == nil && resp != nil && !resp.Error && len(resp.Lines) > 0 {
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return resp, "LRCLIB Search (simplified)", nil
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}
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}
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return nil, "", fmt.Errorf("lyrics not found in any source")
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}
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// FetchLyrics fetches lyrics from the Spotify Lyrics API with LRCLIB fallback
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func (c *LyricsClient) FetchLyrics(spotifyID string) (*LyricsResponse, error) {
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// Decode base64 API URL
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apiBase, _ := base64.StdEncoding.DecodeString("aHR0cHM6Ly9zcG90aWZ5LWx5cmljcy1hcGktcGkudmVyY2VsLmFwcC8/dHJhY2tpZD0=")
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url := fmt.Sprintf("%s%s", string(apiBase), spotifyID)
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apiURL := fmt.Sprintf("%s%s", string(apiBase), spotifyID)
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resp, err := c.httpClient.Get(url)
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resp, err := c.httpClient.Get(apiURL)
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if err != nil {
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return nil, fmt.Errorf("failed to fetch lyrics: %v", err)
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}
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