Port PR #1037 by svvitale

CHANGELOG.md

@@ -8,6 +8,8 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 ## [Unreleased](https://github.com/python-social-auth/social-core/commits/master)
 
 ### Added
+- Add support for MailChimp as an OAuth v2 backend (port from [#1037](https://github.com/omab/python-social-auth/pull/1037)
+  by svvitale)
 - Added Shimmering backend (port from [#1054](https://github.com/omab/python-social-auth/pull/1054)
   by iamkhush)
 - Added Quizlet backend (port from [#1012](https://github.com/omab/python-social-auth/pull/1012)

social_core/backends/mailchimp.py

@@ -0,0 +1,32 @@
+from .oauth import BaseOAuth2
+
+
+class MailChimpOAuth2(BaseOAuth2):
+    """MailChimp OAuth2 authentication backend"""
+    name = 'mailchimp'
+    AUTHORIZATION_URL = 'https://login.mailchimp.com/oauth2/authorize'
+    ACCESS_TOKEN_URL = 'https://login.mailchimp.com/oauth2/token'
+    METADATA_URL = 'https://login.mailchimp.com/oauth2/metadata'
+    ACCESS_TOKEN_METHOD = 'POST'
+    STATE_PARAMETER = False
+    REDIRECT_STATE = False
+    ID_KEY = 'user_id'
+    EXTRA_DATA = [
+        ('accountname', 'accountname'),
+        ('api_endpoint', 'api_endpoint'),
+        ('role', 'role'),
+        ('login', 'login')
+    ]
+
+    def get_user_details(self, response):
+        """Return user details from a Mailchimp metadata response"""
+        return {
+            'username': response['login']['login_name'],
+            'email': response['login']['email']
+        }
+
+    def user_data(self, access_token, *args, **kwargs):
+        """Loads user data and datacenter information from service"""
+        return self.get_json(self.METADATA_URL, headers={
+          'Authorization': 'OAuth ' + access_token
+        })