Support google jwt auth

Ref: stckme/tango#997

apphelpers/socialauth/goog.py

@@ -1,5 +1,7 @@
 import os
 
+from google.auth.transport import requests
+from google.oauth2 import id_token
 from requests_oauthlib import OAuth2Session
 
 try:
@@ -11,7 +13,15 @@
     os.environ["OAUTHLIB_INSECURE_TRANSPORT"] = "True"
 
 
-def fetch_info(access_token):
-    session = OAuth2Session(token={"access_token": access_token})
-    userinfo = session.get("https://www.googleapis.com/oauth2/v1/userinfo").json()
+def fetch_info(access_token, jwt=False):
+    if jwt:
+        request = requests.Request()
+        userinfo = id_token.verify_oauth2_token(
+            id_token=access_token, request=request, audience=settings.G_CLIENT_ID
+        )
+    else:
+        session = OAuth2Session(
+            token={"access_token": access_token}, client_id=settings.G_CLIENT_ID
+        )
+        userinfo = session.get("https://www.googleapis.com/oauth2/v1/userinfo").json()
     return userinfo

setup.py

@@ -13,7 +13,7 @@
 with open("CHANGELOG.rst") as history_file:
     history = history_file.read()
 
-requirements = ["loguru"]
+requirements = ["loguru", "google-auth"]
 
 setup_requirements = []