Add OSChina OAuth2 (#4)

Author: wu-clan

README.md

@@ -21,6 +21,6 @@
 - [ ] 百度
 - [x] Gitee
 - [x] Github
-- [ ] 开源中国
+- [X] 开源中国
 - [ ] 阿里云
 - [ ] TestHome

src/fastapi_oauth20/clients/oschina.py

@@ -0,0 +1,35 @@
+#!/usr/bin/env python3
+# -*- coding: utf-8 -*-
+import httpx
+
+from fastapi_oauth20.oauth20 import OAuth20Base
+
+AUTHORIZE_ENDPOINT = 'https://www.oschina.net/action/oauth2/authorize'
+ACCESS_TOKEN_ENDPOINT = 'https://www.oschina.net/action/openapi/token'
+REFRESH_TOKEN_ENDPOINT = ACCESS_TOKEN_ENDPOINT
+PROFILE_ENDPOINT = 'https://www.oschina.net/action/openapi/user'
+
+
+class OSChinaOAuth20(OAuth20Base):
+    def __init__(self, client_id: str, client_secret: str):
+        super().__init__(
+            client_id=client_id,
+            client_secret=client_secret,
+            authorize_endpoint=AUTHORIZE_ENDPOINT,
+            access_token_endpoint=ACCESS_TOKEN_ENDPOINT,
+            refresh_token_endpoint=REFRESH_TOKEN_ENDPOINT,
+            revoke_token_endpoint=None,
+            oauth_callback_route_name='oschina',
+            default_scopes=None,
+        )
+
+    async def get_userinfo(self, access_token: str) -> dict:
+        """Get user info from OSChina"""
+        headers = {'Authorization': f'Bearer {access_token}'}
+        async with httpx.AsyncClient() as client:
+            response = await client.get(PROFILE_ENDPOINT, headers=headers)
+            await self.raise_httpx_oauth20_errors(response)
+
+            res = response.json()
+
+            return res