add qiita backend

docs/backends/qiita.rst

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+Qiita
+=====
+
+Qiita
+
+- Register a new application at `https://qiita.com/settings/applications`_, set the
+  callback URL to ``http://example.com/complete/qiita/`` replacing
+  ``example.com`` with your domain.
+
+- Fill ``Client ID`` and ``Client Secret`` values in the settings::
+
+      SOCIAL_AUTH_QIITA_KEY = ''
+      SOCIAL_AUTH_QIITA_SECRET = ''
+
+- Also it's possible to define extra permissions with::
+
+      SOCIAL_AUTH_QIITA_SCOPE = [...]
+
+  See auth scopes at https://qiita.com/api/v2/docs#スコープ

social/backends/qiita.py

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+"""
+Qiita OAuth2 backend, docs at:
+    http://psa.matiasaguirre.net/docs/backends/qiita.html
+    http://qiita.com/api/v2/docs#get-apiv2oauthauthorize
+"""
+import json
+
+from social.backends.oauth import BaseOAuth2
+
+
+class QiitaOAuth2(BaseOAuth2):
+    """Qiita OAuth authentication backend"""
+    name = 'qiita'
+
+    AUTHORIZATION_URL = 'https://qiita.com/api/v2/oauth/authorize'
+    ACCESS_TOKEN_URL = 'https://qiita.com/api/v2/access_tokens'
+    ACCESS_TOKEN_METHOD = 'POST'
+    SCOPE_SEPARATOR = ' '
+    REDIRECT_STATE = True
+    EXTRA_DATA = [
+        ('description', 'description'),
+        ('facebook_id', 'facebook_id'),
+        ('followees_count', 'followees_count'),
+        ('followers_count', 'followers_count'),
+        ('github_login_name', 'github_login_name'),
+        ('id', 'id'),
+        ('items_count', 'items_count'),
+        ('linkedin_id', 'linkedin_id'),
+        ('location', 'location'),
+        ('name', 'name'),
+        ('organization', 'organization'),
+        ('profile_image_url', 'profile_image_url'),
+        ('twitter_screen_name', 'twitter_screen_name'),
+        ('website_url', 'website_url'),
+    ]
+
+    def auth_complete_params(self, state=None):
+        data = super(QiitaOAuth2, self).auth_complete_params(state)
+        if "grant_type" in data:
+            del data["grant_type"]
+        if "redirect_uri" in data:
+            del data["redirect_uri"]
+        return json.dumps(data)
+
+    def auth_headers(self):
+        return {'Content-Type': 'application/json'}
+
+    def request_access_token(self, *args, **kwargs):
+        data = super(QiitaOAuth2, self).request_access_token(*args, **kwargs)
+        data.update({'access_token': data['token']})
+        return data
+
+    def get_user_details(self, response):
+        """Return user details from Qiita account"""
+        return {
+            'username': response['id'],
+            'fullname': response['name'],
+        }
+
+    def user_data(self, access_token, *args, **kwargs):
+        """Loads user data from service"""
+        return self.get_json(
+            'https://qiita.com/api/v2/authenticated_user',
+           headers={
+                'Authorization': ' Bearer {0}'.format(access_token)
+            })

social/tests/backends/test_qiita.py

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+import json
+
+from social.tests.backends.oauth import OAuth2Test
+
+
+class QiitaOAuth2Test(OAuth2Test):
+    backend_path = 'social.backends.qiita.QiitaOAuth2'
+    user_data_url = 'https://qiita.com/api/v2/authenticated_user'
+    expected_username = 'foobar'
+
+    access_token_body = json.dumps({
+        'token': 'foobar',
+        'token_type': 'bearer'
+    })
+
+    user_data_body = json.dumps({
+        'id': 'foobar',
+        'name': 'Foo Bar'
+    })
+
+    def test_login(self):
+        self.do_login()
+
+    def test_partial_pipeline(self):
+        self.do_partial_pipeline()