feat(popupLyrics): add lrclib provider

Author: Patrick-orz

popupLyricsPlus.js

@@ -595,7 +595,54 @@ function PopupLyrics() {
                 lyrics = ogLyrics;
 
             return { lyrics };
-        }
+        },
+
+        async fetchLrclib(info) {
+            const baseURL = "https://lrclib.net/api/get";
+            const durr = info.duration / 1000;
+            const params = {
+                track_name: info.title,
+                artist_name: info.artist,
+                album_name: info.album,
+                duration: durr,
+            };
+            const finalURL = `${baseURL}?${Object.keys(params)
+                    .map((key) => `${key}=${encodeURIComponent(params[key])}`)
+                    .join("&")}`;
+            const body = await fetch(finalURL, {
+                headers: {
+                    "x-user-agent": `spicetify v${Spicetify.Config.version} (https://github.com/spicetify/cli)`,
+                },
+            });
+            if (body.status !== 200) {
+                return { error: "No lyrics" };
+            }
+            const meta = await body.json();
+            if (meta?.instrumental) {
+                return { error: "Instrumental" };
+            }
+            if (!meta?.syncedLyrics) {
+                return { error: "No lyrics" };
+            }
+            // Preprocess lyrics by removing [tags] and empty lines
+            const lines = meta?.syncedLyrics
+                .replaceAll(/\[[a-zA-Z]+:.+\]/g, "")
+                .trim()
+                .split("\n");
+            const syncedTimestamp = /\[([0-9:.]+)\]/;
+            const isSynced = lines[0].match(syncedTimestamp);
+            const lyrics = lines.map((line) => {
+                const time = line.match(syncedTimestamp)?.[1];
+                const lyricContent = line.replace(syncedTimestamp, "").trim();
+                const lyric = lyricContent.replaceAll(/\<([0-9:.]+)\>/g, "").trim();
+                const [min, sec] = time.replace(/\[\]\<\>/, "").split(":");
+                if (line.trim() !== "" && isSynced && time) {
+                    return { text: lyric || "♪", startTime: Number(min) * 60 + Number(sec) };
+                }
+                return;
+            });
+            return { lyrics };
+        },
     };
 
     const userConfigs = {
@@ -629,7 +676,12 @@ function PopupLyrics() {
                 on: boolLocalStorage("popup-lyrics:services:spotify:on"),
                 call: LyricProviders.fetchSpotify,
                 desc: "Lyrics sourced from official Spotify API."
-            }
+            },
+            lrclib: {
+                on: boolLocalStorage("popup-lyrics:services:lrclib:on"),
+                call: LyricProviders.fetchLrclib,
+                desc: "Lyrics sourced from lrclib.net. Supports both synced and unsynced lyrics. LRCLIB is a free and open-source lyrics provider.",
+            },
         },
         servicesOrder: []
     };