Setting to enable or disable ChartLyrics

Will be disabled by default
(cherry picked from commit b662162ca7)

config.sample

@@ -43,6 +43,9 @@ log_rotate = yes
 ; Default: El La Le Las Les Los The
 index_ignored_prefixes = El La Le Las Les Los The
 
+; Enable the ChartLyrics API. Default: off
+online_lyrics = off
+
 [daemon]
 ; Socket file the daemon will listen on for incoming management commands
 ; Default: /tmp/supysonic/supysonic.sock

docs/setup/configuration.rst

@@ -147,6 +147,11 @@ Configuration relative to the HTTP server.
    case insensitive.
    Defaults to ``El La Le Las Les Los The``.
 
+``online_lyrics``
+   If enabled, will fetch the lyrics (when requested) from ChartLyrics if they
+   aren't available locally (either from metadata or from text files).
+   Defaults to ``no``.
+
 Sample configuration::
 
    [webapp]
@@ -180,6 +185,9 @@ Sample configuration::
    ; Default: El La Le Las Les Los The
    index_ignored_prefixes = El La Le Las Les Los The
 
+   ; Enable the ChartLyrics API. Default: off
+   online_lyrics = off
+
 .. _conf-daemon:
 
 ``[daemon]`` section

supysonic/api/media.py

@@ -443,6 +443,9 @@ def lyrics():
 
             return lyrics_response_for_track(track, lyrics)
 
+    if not current_app.config["WEBAPP"]["online_lyrics"]:
+        return request.formatter("lyrics", {})
+
     # Create a stable, unique, filesystem-compatible identifier for the artist+title
     unique = hashlib.md5(
         json.dumps([x.lower() for x in (artist, title)]).encode("utf-8")

supysonic/config.py

@@ -38,6 +38,7 @@ class DefaultConfig:
         "mount_webui": True,
         "mount_api": True,
         "index_ignored_prefixes": "El La Le Las Les Los The",
+        "online_lyrics": False,
     }
     DAEMON = {
         "socket": r"\\.\pipe\supysonic"

tests/net/test_lyrics.py

@@ -19,6 +19,8 @@ class LyricsTestCase(ApiTestBase):
     def setUp(self):
         super().setUp()
 
+        self.config.WEBAPP["online_lyrics"] = True
+
         folder = Folder.create(
             name="Root",
             path=os.path.abspath("tests/assets/lyrics"),