backends: Add MusicBrainz OAuth2

social_core/backends/musicbrainz.py

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+from social_core.backends.oauth import BaseOAuth2
+
+class MusicBrainzOAuth2(BaseOAuth2):
+    """MusicBrainz OAuth authentication backend"""
+    name = 'musicbrainz'
+    AUTHORIZATION_URL = 'https://musicbrainz.org/oauth2/authorize'
+    ACCESS_TOKEN_URL = 'https://musicbrainz.org/oauth2/token'
+    ACCESS_TOKEN_METHOD = 'POST'
+    ID_KEY = 'metabrainz_user_id'
+    DEFAULT_SCOPE = ['profile', 'email']
+    SCOPE_SEPARATOR = ' '
+    REDIRECT_STATE = False
+    EXTRA_DATA = [
+        ('metabrainz_user_id', 'id'),
+        ('expires_in', 'expires'),
+    ]
+
+    def get_user_details(self, response):
+        """Return user details from MusicBrainz account"""
+        return {'username': response.get('sub'),
+                'email': response.get('email') or '',
+                'first_name': response.get('sub')}
+
+    def user_data(self, access_token, *args, **kwargs):
+        """Loads user data from service"""
+        return self.get_json('https://musicbrainz.org/oauth2/userinfo', params={
+            'access_token': access_token
+        })

social_core/tests/backends/test_musicbrainz.py

@@ -0,0 +1,28 @@
+import json
+
+from httpretty import HTTPretty
+
+from ...exceptions import AuthFailed
+from .oauth import OAuth2Test
+
+
+class MusicBrainzAuth2Test(OAuth2Test):
+    backend_path = 'social_core.backends.musicbrainz.MusicBrainzOAuth2'
+    user_data_url = 'https://musicbrainz.org/oauth2/userinfo'
+    expected_username = 'foobar'
+    access_token_body = json.dumps({
+      'access_token': 'GjtKfJS6G4lupbQcCOiTKo4HcLXUgI1p',
+      'expires_in': 3600,
+      'token_type': 'Bearer',
+      'refresh_token': 'GjSCBBjp4fnbE0AKo3uFu9qq9K2fFm4u'
+    })
+    user_data_body = json.dumps({
+        'sub': 'foobar',
+        'email': 'foo@bar.com',
+    })
+
+    def test_login(self):
+        self.do_login()
+
+    def test_partial_pipeline(self):
+        self.do_partial_pipeline()