fix: reject metadata-only lyrics and refresh stale sidecars

backend/src/main/java/com/music/service/IngestService.java

@@ -964,7 +964,10 @@ public class IngestService {
                                        String safeTitle, String originalTitle, String artist) {
         try {
             String lyrics = tag.getFirst(FieldKey.LYRICS);
-            if (lyrics == null || lyrics.trim().isEmpty()) return false;
+            if (!LyricsService.hasMeaningfulLyrics(lyrics)) {
+                log.debug("忽略无正文的嵌入式歌词: {}", safeTitle);
+                return false;
+            }
 
             // 构建简易 LRC 内容（无时间戳，仅作为歌词文本）
             StringBuilder lrcContent = new StringBuilder();

backend/src/main/java/com/music/service/LibraryHealthService.java

@@ -125,7 +125,9 @@ public class LibraryHealthService {
                     String name = f.getFileName().toString();
                     if (name.toLowerCase(Locale.ROOT).endsWith(".lrc")) {
                         String base = baseName(name).toLowerCase(Locale.ROOT);
+                        if (LyricsService.hasMeaningfulLyrics(f)) {
                             lrcBaseNames.add(base);
+                        }
                         if (!audioBaseNames.contains(base)) {
                             report.setOrphanSidecars(report.getOrphanSidecars() + 1);
                             addExample(report.getExamplesOrphanSidecars(), rel(libraryPath, f));
@@ -404,7 +406,7 @@ public class LibraryHealthService {
 
     // ========== 工具 ==========
 
-    /** 大小写不敏感判定音频是否有同名 .lrc 侧车（.lrc/.LRC 等）。 */
+    /** 大小写不敏感判定音频是否有同名且包含正文的 .lrc 侧车。 */
     private boolean hasLrcSidecar(Path audio) {
         Path dir = audio.getParent();
         if (dir == null) return false;
@@ -412,7 +414,8 @@ public class LibraryHealthService {
         try (DirectoryStream<Path> ds = Files.newDirectoryStream(dir)) {
             for (Path f : ds) {
                 if (Files.isRegularFile(f)
-                        && f.getFileName().toString().toLowerCase(Locale.ROOT).equals(target)) {
+                        && f.getFileName().toString().toLowerCase(Locale.ROOT).equals(target)
+                        && LyricsService.hasMeaningfulLyrics(f)) {
                     return true;
                 }
             }

backend/src/main/java/com/music/service/LyricsService.java

@@ -7,6 +7,7 @@ import org.slf4j.LoggerFactory;
 import org.springframework.stereotype.Service;
 
 import java.io.ByteArrayOutputStream;
+import java.io.IOException;
 import java.io.InputStream;
 import java.net.HttpURLConnection;
 import java.net.URL;
@@ -19,6 +20,8 @@ import java.util.ArrayList;
 import java.util.Comparator;
 import java.util.List;
 import java.util.Locale;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
 
 /** Optional lyric lookup. All failures are intentionally non-fatal to ingest. */
 @Service
@@ -26,6 +29,8 @@ public class LyricsService {
     private static final Logger log = LoggerFactory.getLogger(LyricsService.class);
     private static final ObjectMapper MAPPER = new ObjectMapper();
     private static final int MAX_BYTES = 256 * 1024;
+    private static final Pattern TIMED_LINE = Pattern.compile("^\\s*\\[(?:\\d{1,2}:)?\\d{1,2}:\\d{2}(?:\\.\\d+)?\\]\\s*(.*)$");
+    private static final Pattern META_LINE = Pattern.compile("^(?:作词|作曲|词曲|编曲|制作人?|混音(?:师|助理)?|录音(?:师)?|工程师|弦乐|鼓和钢琴|电贝斯|额外编程|数字编辑|原唱|演唱|出品|发行|版权|produced|written|composer|arranged|lyrics?|music|artist|title)\\s*[:：\\-].*$", Pattern.CASE_INSENSITIVE);
 
     /**
      * 远程歌词解析结果（供入库报告统计使用）。
@@ -53,7 +58,7 @@ public class LyricsService {
     public RemoteOutcome resolveRemote(Path targetFile, String title, String artist) {
         if (targetFile == null || title == null || artist == null) return RemoteOutcome.MISSING;
         Path lrc = targetFile.resolveSibling(baseName(targetFile.getFileName().toString()) + ".lrc");
-        if (Files.isRegularFile(lrc)) return RemoteOutcome.EXISTS;
+        if (Files.isRegularFile(lrc) && hasMeaningfulLyrics(lrc)) return RemoteOutcome.EXISTS;
         if (!enabled()) return RemoteOutcome.DISABLED;
         try {
             Candidate c = lookup(title, artist);
@@ -87,7 +92,7 @@ public class LyricsService {
         List<Candidate> candidates = new ArrayList<>();
         if (root != null && root.isArray()) for (JsonNode n : root) {
             String lyrics = text(n, "lyrics");
-            if (lyrics.trim().isEmpty()) continue;
+            if (!hasMeaningfulLyrics(lyrics)) continue;
             String ct = text(n, "title"), ca = text(n, "artist");
             int score = score(title, artist, ct, ca, lyrics, text(n, "type"), n.path("isComplete").asBoolean(false));
             candidates.add(new Candidate(lyrics, text(n, "source"), score));
@@ -104,6 +109,35 @@ public class LyricsService {
     }
     private static String norm(String s) { return s == null ? "" : s.toLowerCase(Locale.ROOT).replaceAll("[（(](网易云音乐|酷狗音乐)[）)]", "").replaceAll("[^\\p{L}\\p{N}]", ""); }
     private static String text(JsonNode n, String k) { return n.path(k).asText(""); }
+    static boolean hasMeaningfulLyrics(Path file) {
+        if (file == null || !Files.isRegularFile(file)) return false;
+        try {
+            return hasMeaningfulLyrics(new String(Files.readAllBytes(file), StandardCharsets.UTF_8));
+        } catch (IOException e) {
+            return false;
+        }
+    }
+
+    /**
+     * Reject metadata-only placeholders such as title/artist lines while accepting
+     * both timestamped LRC and plain embedded lyric text.
+     */
+    static boolean hasMeaningfulLyrics(String lyrics) {
+        if (lyrics == null) return false;
+        String normalized = lyrics.replace("\uFEFF", "").replace("\r", "");
+        int lines = 0;
+        int chars = 0;
+        for (String raw : normalized.split("\\n")) {
+            String line = raw.trim();
+            if (line.isEmpty() || line.matches("^\\[(?:ti|ar|al|by|re|ve|offset):.*$")) continue;
+            Matcher timed = TIMED_LINE.matcher(line);
+            String body = timed.matches() ? timed.group(1).trim() : line;
+            if (body.isEmpty() || META_LINE.matcher(body).matches()) continue;
+            lines++;
+            chars += body.replaceAll("\\s+", "").length();
+        }
+        return lines >= 2 && chars >= 8;
+    }
     private static byte[] readLimited(InputStream in) throws Exception { try (InputStream x = in; ByteArrayOutputStream b = new ByteArrayOutputStream()) { byte[] buf = new byte[8192]; int n, total = 0; while ((n = x.read(buf)) >= 0) { total += n; if (total > MAX_BYTES) throw new IllegalArgumentException("歌词响应过大"); b.write(buf, 0, n); } return b.toByteArray(); } }
     private static String value(String env, String prop, String def) { String v = System.getenv(env); if (v == null || v.isEmpty()) v = System.getProperty(prop); return v == null || v.isEmpty() ? def : v; }
     private static String baseName(String n) { int i = n.lastIndexOf('.'); return i > 0 ? n.substring(0, i) : n; }

backend/src/test/java/com/music/service/LibraryHealthServiceTest.java

@@ -30,7 +30,7 @@ class LibraryHealthServiceTest {
         Path album = root.resolve("Artist").resolve("Album");
         Files.createDirectories(album);
         Files.write(album.resolve("01 - Song.mp3"), new byte[]{1, 2, 3});
-        Files.write(album.resolve("01 - Song.lrc"), "[00:01]hi".getBytes(StandardCharsets.UTF_8));
+        Files.write(album.resolve("01 - Song.lrc"), "[00:01]first line\n[00:02]second line".getBytes(StandardCharsets.UTF_8));
         Files.write(album.resolve("orphan.lrc"), "[00:01]orphan".getBytes(StandardCharsets.UTF_8));
         Files.write(album.resolve("cover.jpg"), new byte[]{(byte) 0xFF, (byte) 0xD8, (byte) 0xFF});
         return album;
@@ -244,7 +244,7 @@ class LibraryHealthServiceTest {
             Files.createDirectories(album);
             // 大写 .LRC 侧车：既不应算缺歌词，也不应算孤立（与 orphan 判定保持一致）
             Files.write(album.resolve("01 - Song.mp3"), new byte[]{1, 2, 3});
-            Files.write(album.resolve("01 - Song.LRC"), "[00:01]hi".getBytes(StandardCharsets.UTF_8));
+            Files.write(album.resolve("01 - Song.LRC"), "[00:01]first line\n[00:02]second line".getBytes(StandardCharsets.UTF_8));
 
             LibraryHealthService svc = newService(root);
             LibraryHealthReport report = svc.scan(false);

backend/src/test/java/com/music/service/LyricsServiceTest.java

@@ -22,8 +22,8 @@ class LyricsServiceTest {
     @Test
     void selectsExactArtistInsteadOfFirstCoverCandidate() throws Exception {
         String json = "["
-                + "{\"title\":\"夜曲 (网易云音乐)\",\"artist\":\"Xai小爱\",\"lyrics\":\"[00:01]翻唱\",\"type\":\"lrc\",\"source\":\"netease\"},"
+                + "{\"title\":\"夜曲 (网易云音乐)\",\"artist\":\"Xai小爱\",\"lyrics\":\"[00:01]翻唱第一句\\n[00:02]翻唱第二句\",\"type\":\"lrc\",\"source\":\"netease\"},"
-                + "{\"title\":\"夜曲 (酷狗音乐)\",\"artist\":\"周杰伦\",\"lyrics\":\"[00:01]一群嗜血的蚂蚁\",\"type\":\"lrc\",\"source\":\"kugou\",\"isComplete\":true}]";
+                + "{\"title\":\"夜曲 (酷狗音乐)\",\"artist\":\"周杰伦\",\"lyrics\":\"[00:01]一群嗜血的蚂蚁\\n[00:02]被腐肉所吸引\",\"type\":\"lrc\",\"source\":\"kugou\",\"isComplete\":true}]";
         start(json, 200);
         LyricsService.Candidate result = new LyricsService().lookup("夜曲", "周杰伦");
         assertNotNull(result);
@@ -37,6 +37,17 @@ class LyricsServiceTest {
         assertNull(new LyricsService().lookup("夜曲", "周杰伦"));
     }
 
+    @Test
+    void rejectsMetadataOnlyLyrics() {
+        assertFalse(LyricsService.hasMeaningfulLyrics("[00:00.00]特别的人\n[00:00.00]方大同\n"));
+        assertFalse(LyricsService.hasMeaningfulLyrics("[ti:特别的人]\n[ar:方大同]\n"));
+    }
+
+    @Test
+    void acceptsTimestampedLyrics() {
+        assertTrue(LyricsService.hasMeaningfulLyrics("[00:01.00]第一句歌词\n[00:03.00]第二句歌词\n"));
+    }
+
     private void start(String body, int status) throws Exception {
         server = HttpServer.create(new InetSocketAddress("127.0.0.1", 0), 0);
         server.createContext("/lrc", exchange -> {

scripts/backfill-lyrics.sh

@@ -7,7 +7,25 @@ AUTH="${MANGTOOL_LYRICS_AUTH:-}"
 export BASE_URL AUTH
 find "$LIBRARY_DIR" -type f \( -iname '*.mp3' -o -iname '*.flac' -o -iname '*.m4a' -o -iname '*.aac' -o -iname '*.ogg' -o -iname '*.opus' -o -iname '*.wma' \) -print0 |
 while IFS= read -r -d '' audio; do
-  lrc="${audio%.*}.lrc"; [[ -s "$lrc" ]] && { echo "SKIP $audio"; continue; }
+  lrc="${audio%.*}.lrc"
+  if [[ -s "$lrc" ]] && python3 - "$lrc" <<'PY'
+import re,sys
+text=open(sys.argv[1],encoding='utf-8-sig',errors='replace').read().replace('\r','')
+meta=re.compile(r'^\[(?:ti|ar|al|by|re|ve|offset):',re.I)
+timed=re.compile(r'^\s*\[(?:\d{1,2}:)?\d{1,2}:\d{2}(?:\.\d+)?\]\s*(.*)$')
+labels=re.compile(r'^(?:作词|作曲|词曲|编曲|制作人?|混音(?:师|助理)?|录音(?:师)?|工程师|弦乐|鼓和钢琴|电贝斯|额外编程|数字编辑|原唱|演唱|出品|发行|版权|produced|written|composer|arranged|lyrics?|music|artist|title)\s*[:：\-].*$',re.I)
+body=[]
+for raw in text.split('\n'):
+ line=raw.strip()
+ if not line or meta.match(line): continue
+ match=timed.match(line); line=(match.group(1).strip() if match else line)
+ if line and not labels.match(line): body.append(line)
+sys.exit(0 if len(body)>=2 and len(''.join(body).replace(' ',''))>=8 else 1)
+PY
+  then
+    echo "SKIP $audio"
+    continue
+  fi
   meta=$(ffprobe -v error -show_entries format_tags=title,artist -of json "$audio" 2>/dev/null || true)
   result=$(AUDIO_META="$meta" python3 - <<'PY'
 import json,os,sys,urllib.parse,urllib.request
@@ -19,10 +37,22 @@ try:
  with urllib.request.urlopen(req,timeout=15) as r: rows=json.load(r)
 except Exception: sys.exit(0)
 def n(x): return ''.join(c.lower() for c in x if c.isalnum())
+def meaningful(text):
+ import re
+ meta=re.compile(r'^\[(?:ti|ar|al|by|re|ve|offset):',re.I)
+ timed=re.compile(r'^\s*\[(?:\d{1,2}:)?\d{1,2}:\d{2}(?:\.\d+)?\]\s*(.*)$')
+ labels=re.compile(r'^(?:作词|作曲|词曲|编曲|制作人?|混音(?:师|助理)?|录音(?:师)?|工程师|弦乐|鼓和钢琴|电贝斯|额外编程|数字编辑|原唱|演唱|出品|发行|版权|produced|written|composer|arranged|lyrics?|music|artist|title)\s*[:：\-].*$',re.I)
+ body=[]
+ for raw in text.replace('\r','').split('\n'):
+  line=raw.strip()
+  if not line or meta.match(line): continue
+  match=timed.match(line); line=(match.group(1).strip() if match else line)
+  if line and not labels.match(line): body.append(line)
+ return len(body)>=2 and len(''.join(body).replace(' ',''))>=8
 best=None
 for x in rows if isinstance(rows,list) else []:
  l=x.get('lyrics','').strip(); ct=x.get('title',''); ca=x.get('artist','')
- if not l: continue
+ if not meaningful(l): continue
  s=(45 if n(t)==n(ct) else 25 if n(t) in n(ct) or n(ct) in n(t) else 0)+(45 if n(a)==n(ca) else 20 if n(a) in n(ca) or n(ca) in n(a) else -40)
  s+=10 if '[' in l and ':' in l else 0
  if s>=60 and (best is None or s>best[0]): best=(s,l)