Sep16, 2020 日誌

學會用 Gmail API 寄信，和上傳檔案到 Google Drive。

在我們開始用 Gmail 和 Google Drive 的 API 前到 console.develolpers 在側邊面板的資料庫 (Library) 加入 Gmail API 和 Google Drive API， 設定 OAuth 同意畫面 ( OAuth constent screen )並在憑證頁面(Credetials)新增一個 OAuth 2 的用戶端憑證 (OAuth 2 Client ID)，類型為電腦應用程式(Desktop app)，完成建立後，下載 json 檔 (之後認證會需要用到)

Gmail API

translate json to pickle

import pickle
from google_auth_oauthlib.flow import InstalledAppFlow
from httplib2 import Http
from googleapiclient.discovery import build

creds = None
SCOPES = 'https://www.googleapis.com/auth/gmail.send' # Allows sending only, not reading

flow = InstalledAppFlow.from_client_secrets_file(
    './../cilent_gm_blogger.json', SCOPES)
creds = flow.run_local_server(port=0)
# Save the credentials for the naext run
with open('./../client_gmail.pickle', 'wb') as token:
    pickle.dump(creds, token)

service = build('gmail', 'v1', credentials=creds)
print(service)

send mail

from email.mime.text import MIMEText
from base64 import urlsafe_b64encode
from httplib2 import Http
from googleapiclient.discovery import build
import pickle

SENDER = "sender@email"
RECIPIENT = "recipient@gm.nfu.edu.tw"
SUBJECT = "gmail api 寄信測試"
CONTENT = ''' 這是文章內容, http://the.web.site'''

creds = None
with open('./../client_gmail.pickle', 'rb') as token:
    creds = pickle.load(token)
service = build('gmail', 'v1', credentials=creds)

# https://developers.google.com/gmail/api/guides/sending
def create_message(sender, to, subject, message_text):
  """Create a message for an email.

  Args:
    sender: Email address of the sender.
    to: Email address of the receiver.
    subject: The subject of the email message.
    message_text: The text of the email message.

  Returns:
    An object containing a base64url encoded email object.
  """
  message = MIMEText(message_text)
  message['to'] = to
  message['from'] = sender
  message['subject'] = subject
  encoded_message = urlsafe_b64encode(message.as_bytes())
  return {'raw': encoded_message.decode()}


# https://developers.google.com/gmail/api/guides/sending
def send_message(service, user_id, message):
  """Send an email message.

  Args:
    service: Authorized Gmail API service instance.
    user_id: User's email address. The special value "me"
    can be used to indicate the authenticated user.
    message: Message to be sent.

  Returns:
    Sent Message.
  """
  try:
    message = (service.users().messages().send(userId=user_id, body=message)
               .execute())
    print('Message Id: %s' % message['id'])
    return message
  #except errors.HttpError, error:
  except:
    print('An error occurred: %s' % error)


raw_msg = create_message(SENDER, RECIPIENT, SUBJECT, CONTENT)
send_message(service, "me", raw_msg)

Google Drive API

translate json to pickle：轉換憑證格式

import pickle
from google_auth_oauthlib.flow import InstalledAppFlow
from httplib2 import Http
from googleapiclient.discovery import build

creds = None
SCOPES = 'https://www.googleapis.com/auth/drive' # Allows sending only, not reading

flow = InstalledAppFlow.from_client_secrets_file(
    './../client_id.json', SCOPES)
creds = flow.run_local_server(port=0)
# Save the credentials for the naext run
with open('./../client_id_drive.pickle', 'wb') as token:
    pickle.dump(creds, token)

service = build('drive', 'v3', credentials=creds)
print(service)

quickstart：測試憑證的檔案是否正常

#web url : https://developers.google.com/drive/api/v3/quickstart/python
from __future__ import print_function
import pickle
import os.path
from googleapiclient.discovery import build
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request

# If modifying these scopes, delete the file token.pickle.
SCOPES = ['https://www.googleapis.com/auth/drive.metadata.readonly']

def main():
    """Shows basic usage of the Drive v3 API.
    Prints the names and ids of the first 10 files the user has access to.
    """
    creds = None
    # The file token.pickle 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.pickle'):
        with open('token.pickle', 'rb') as token:
            creds = pickle.load(token)
    # 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.pickle', 'wb') as token:
            pickle.dump(creds, token)

    service = build('drive', 'v3', credentials=creds)

    # Call the Drive v3 API
    results = service.files().list(
        pageSize=10, fields="nextPageToken, files(id, name)").execute()
    items = results.get('files', [])

    if not items:
        print('No files found.')
    else:
        print('Files:')
        for item in items:
            print(u'{0} ({1})'.format(item['name'], item['id']))

if __name__ == '__main__':
    main()

upload fileg：上傳檔案

from pydrive.auth import GoogleAuth
from pydrive.drive import GoogleDrive

gauth = GoogleAuth()
gauth.LoadClientConfigFile("client_secret.json")
#gauth.LocalWebserverAuth() # client_secrets.json need to be in the same directory as the script
drive = GoogleDrive(gauth)

'''
# View all folders and file in your Google Drive
fileList = drive.ListFile({'q': "'root' in parents and trashed=false"}).GetList()
for file in fileList:
  print('Title: %s, ID: %s' % (file['title'], file['id']))
  # Get the folder ID that you want
  # 檔案會上傳到根目錄下的 uploaded  目錄中
  if(file['title'] == "uploaded"):
      fileID = file['id']
'''
# GDrive 上 uploaded 目錄的 fileID
with open("./../uploaded_id.txt", 'r') as content_file:
    fileID = content_file.read()

#uploaded_id.txt content is your target folder ID
#fileID = "your_folder_file_ID"

fileName = "cat.jpg"
filePath = "./"
file1 = drive.CreateFile({"mimeType": "image/jpeg", "parents": [{"kind": "drive#fileLink", "id": fileID}], "title":  fileName})
file1.SetContentFile(filePath + fileName)
file1.Upload() # Upload the file.
#print('Created file %s with mimeType %s' % (file1['title'], file1['mimeType']))   
print("upload fileID:" + str(file1['id']))
file2 = drive.CreateFile({'id': file1['id']})
file2.GetContentFile('./test/downloaded_cat.jpg') # Download file as 'downloaded_cat.jpg under directory test'.