Fix #4080

beetsplug/discogs.py

@@ -197,6 +197,31 @@ def candidates(self, items, artist, album, va_likely, extra_tags=None):
             self._log.debug('Connection error in album search', exc_info=True)
             return []
 
+    @staticmethod
+    def extract_release_id_regex(album_id):
+        """Returns the Discogs_id or None."""
+        # Discogs-IDs are simple integers. In order to avoid confusion with
+        # other metadata plugins, we only look for very specific formats of the
+        # input string:
+        # - plain integer, optionally wrapped in brackets and prefixed by an
+        #   'r', as this is how discogs displays the release ID on its webpage.
+        # - legacy url format: discogs.com/<name of release>/release/<id>
+        # - current url format: discogs.com/release/<id>-<name of release>
+        # See #291, #4080 and #4085 for the discussions leading up to these
+        # patterns.
+        # Regex has been tested here https://regex101.com/r/wyLdB4/2
+
+        for pattern in [
+                r'^\[?r?(?P<id>\d+)\]?$',
+                r'discogs\.com/release/(?P<id>\d+)-',
+                r'discogs\.com/[^/]+/release/(?P<id>\d+)',
+        ]:
+            match = re.search(pattern, album_id)
+            if match:
+                return int(match.group('id'))
+
+        return None
+
     def album_for_id(self, album_id):
         """Fetches an album by its Discogs ID and returns an AlbumInfo object
         or None if the album is not found.
@@ -205,15 +230,13 @@ def album_for_id(self, album_id):
             return
 
         self._log.debug('Searching for release {0}', album_id)
-        # Discogs-IDs are simple integers. We only look for those at the end
-        # of an input string as to avoid confusion with other metadata plugins.
-        # An optional bracket can follow the integer, as this is how discogs
-        # displays the release ID on its webpage.
-        match = re.search(r'(^|\[*r|discogs\.com/.+/release/)(\d+)($|\])',
-                          album_id)
-        if not match:
+
+        discogs_id = self.extract_release_id_regex(album_id)
+
+        if not discogs_id:
             return None
-        result = Release(self.discogs_client, {'id': int(match.group(2))})
+
+        result = Release(self.discogs_client, {'id': discogs_id})
         # Try to obtain title to verify that we indeed have a valid Release
         try:
             getattr(result, 'title')
@@ -226,7 +249,8 @@ def album_for_id(self, album_id):
                     return self.album_for_id(album_id)
             return None
         except CONNECTION_ERRORS:
-            self._log.debug('Connection error in album lookup', exc_info=True)
+            self._log.debug('Connection error in album lookup',
+                            exc_info=True)
             return None
         return self.get_album_info(result)
 

docs/changelog.rst

@@ -39,6 +39,9 @@ Bug fixes:
 * :doc:`/plugins/lyrics`: Fix crash bug when beautifulsoup4 is not installed.
   :bug:`4027`
 
+* :doc:`/plugins/discogs`: Adapt regex to new URL format .
+  :bug: `4080`
+
 1.5.0 (August 19, 2021)
 -----------------------
 

test/test_discogs.py

@@ -172,16 +172,16 @@ def test_parse_position(self):
         """Test the conversion of discogs `position` to medium, medium_index
         and subtrack_index."""
         # List of tuples (discogs_position, (medium, medium_index, subindex)
-        positions = [('1',       (None,   '1',  None)),
-                     ('A12',     ('A',    '12', None)),
-                     ('12-34',   ('12-',  '34', None)),
-                     ('CD1-1',   ('CD1-', '1',  None)),
-                     ('1.12',    (None,   '1',  '12')),
-                     ('12.a',    (None,   '12', 'A')),
-                     ('12.34',   (None,   '12', '34')),
-                     ('1ab',     (None,   '1',  'AB')),
+        positions = [('1', (None, '1', None)),
+                     ('A12', ('A', '12', None)),
+                     ('12-34', ('12-', '34', None)),
+                     ('CD1-1', ('CD1-', '1', None)),
+                     ('1.12', (None, '1', '12')),
+                     ('12.a', (None, '12', 'A')),
+                     ('12.34', (None, '12', '34')),
+                     ('1ab', (None, '1', 'AB')),
                      # Non-standard
-                     ('IV',      ('IV',   None, None)),
+                     ('IV', ('IV', None, None)),
                      ]
 
         d = DiscogsPlugin()
@@ -355,9 +355,28 @@ def test_parse_release_without_required_fields(self):
         self.assertEqual(d, None)
         self.assertIn('Release does not contain the required fields', logs[0])
 
+    def test_album_for_id(self):
+        """Test parsing for a valid Discogs release_id"""
+        test_patterns = [('http://www.discogs.com/G%C3%BCnther-Lause-Meru-Ep/release/4354798', 4354798),  # NOQA E501
+                         ('http://www.discogs.com/release/4354798-G%C3%BCnther-Lause-Meru-Ep', 4354798),  # NOQA E501
+                         ('http://www.discogs.com/G%C3%BCnther-4354798Lause-Meru-Ep/release/4354798', 4354798),  # NOQA E501
+                         ('http://www.discogs.com/release/4354798-G%C3%BCnther-4354798Lause-Meru-Ep/', 4354798),  # NOQA E501
+                         ('[r4354798]', 4354798),
+                         ('r4354798', 4354798),
+                         ('4354798', 4354798),
+                         ('yet-another-metadata-provider.org/foo/12345', ''),
+                         ('005b84a0-ecd6-39f1-b2f6-6eb48756b268', ''),
+                         ]
+        for test_pattern, expected in test_patterns:
+            match = DiscogsPlugin.extract_release_id_regex(test_pattern)
+            if not match:
+                match = ''
+            self.assertEqual(match, expected)
+
 
 def suite():
     return unittest.TestLoader().loadTestsFromName(__name__)
 
+
 if __name__ == '__main__':
     unittest.main(defaultTest='suite')