Update Gmail access with OAuth 2

examples/gmail.py

@@ -0,0 +1,76 @@
+#
+# Copyright 2018 Google LLC
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+#
+# Setup : https://developers.google.com/gmail/api/quickstart/python
+# Need to have credentials.json were you call main script
+#
+# File imported from https://github.com/googleworkspace/python-samples/blob/main/gmail/quickstart/quickstart.py
+#
+
+from __future__ import print_function
+
+import os.path
+
+from google.auth.transport.requests import Request
+from google.oauth2.credentials import Credentials
+from google_auth_oauthlib.flow import InstalledAppFlow
+from googleapiclient.discovery import build
+
+# If modifying these scopes, delete the file token.json.
+SCOPES = ['https://www.googleapis.com/auth/gmail.readonly']
+
+creds = None
+
+def _initCreds():
+    global creds
+    if creds: return
+    
+    # The file token.json stores the user's access and refresh tokens, and is
+    # created automatically when the authorization flow completes for the first
+    # time.
+    if os.path.exists('token.json'):
+        creds = Credentials.from_authorized_user_file('./token.json', SCOPES)
+    # If there are no (valid) credentials available, let the user log in.
+    if not creds or not creds.valid:
+        if creds and creds.expired and creds.refresh_token:
+            creds.refresh(Request())
+        else:
+            flow = InstalledAppFlow.from_client_secrets_file(
+                'credentials.json', SCOPES)
+            creds = flow.run_local_server(port=0)
+        # Save the credentials for the next run
+        with open('token.json', 'w') as token:
+            token.write(creds.to_json())
+    
+def getUnreadMails():
+    """Shows basic usage of the Gmail API.
+    Lists the user's Gmail labels.
+    """
+
+    _initCreds()
+    
+    service = build('gmail', 'v1', credentials=creds)
+    nbUnreadMessages = 0
+    pageToken = ''
+    while True:
+        results = service.users().messages().list(userId='me', labelIds=['UNREAD'],\
+                                                  includeSpamTrash=False, pageToken=pageToken)\
+                                            .execute()
+        nbUnreadMessages += len(results.get('messages', []))
+        pageToken = results.get('nextPageToken', '')
+        if not pageToken: break
+
+    return nbUnreadMessages