"使用 Microsoft Graph API 的 SendMail 请求时出现“BadRequest”错误"

Question

I am writing a python script to send a mail using the Microsoft Graph API. The mail is sent to only those IDs which exists in our AAD.

from adal import AuthenticationContext
import adal
import string
import urllib
import json
import requests
import pprint
import base64
import mimetypes

API_VERSION = 'beta'
RESOURCE = 'https://graph.microsoft.com'
TENANT = <my tenant ID>
CLIENTID = <Client ID>
CLIENTSECRET = <sescret>
DOMAIN = <mydomain>

# AUTHENTICATION - get access token and update session header
def get_session():

    authority_host_url = 'https://login.windows.net'
    tenant = TENANT
    authority_url = authority_host_url + '/' + tenant
    service_endpoint = "https://graph.microsoft.com/"

    client_id = CLIENTID
    client_secret = CLIENTSECRET


    # Retrieves authentication tokens from Azure Active Directory and creates a new AuthenticationContext object.
    context = AuthenticationContext(authority_url, validate_authority=True, cache=None, api_version=None, timeout=300, enable_pii=False)
    # Gets a token for a given resource via client credentials.
    token_response = context.acquire_token_with_client_credentials(service_endpoint, client_id, client_secret)

    # Create a persistent session with the access token
    session = requests.Session()
    session.headers.update({'Authorization': f'Bearer {token_response["accessToken"]}', 'SdkVersion': 'python-adal', 'x-client-SKU': 'DynaAdmin'})
    #session.headers.update({'Authorization': f'Bearer {token_response["accessToken"]}'})

    return session

def build_uri(url):
    if 'https' == urllib.parse.urlparse(url).scheme:
        return url
    result = urllib.parse.urljoin(f'{RESOURCE}/{API_VERSION}/', url.lstrip('/'))

    print("\nURL:\n")
    print(result)

    return result

def sendmail(*, session, subject=None, recipients=None, body='',
             content_type='HTML', attachments=None):
    """Helper to send email from current user.

    session       = user-authenticated session for graph API
    subject      = email subject (required)
    recipients   = list of recipient email addresses (required)
    body         = body of the message
    content_type = content type (default is 'HTML')
    attachments  = list of file attachments (local filenames)

    Returns the response from the POST to the sendmail API.
    """

    # Verify that required arguments have been passed.
    if not all([session, subject, recipients]):
        raise ValueError('sendmail(): required arguments missing')

    # Create recipient list in required format.
    recipient_list = [{'EmailAddress': {'Address': address}}
                      for address in recipients]

    # Create list of attachments in required format.
    attached_files = []
    if attachments:
        for filename in attachments:
            b64_content = base64.b64encode(open(filename, 'rb').read())
            mime_type = mimetypes.guess_type(filename)[0]
            mime_type = mime_type if mime_type else ''
            attached_files.append( \
                {'@odata.type': '#microsoft.graph.fileAttachment',
                 'ContentBytes': b64_content.decode('utf-8'),
                 'ContentType': mime_type,
                 'Name': filename})

    # Create email message in required format.
    email_msg = {'Message': {'Subject': subject,
                             'Body': {'ContentType': content_type, 'Content': body},
                             'ToRecipients': recipient_list,
                             'Attachments': attached_files},
                 'SaveToSentItems': 'true'}

    print("\nBody:\n")              
    print(email_msg)    

    # Do a POST to Graph's sendMail API and return the response.
    resp = session.post(build_uri('/users/8368b7b5-b337ac267220/sendMail'), data=email_msg, stream=True, headers={'Content-Type': 'application/json'})

    return resp

# ------------ RUN CODE ------------

session = get_session()

myRecipients = "sea.chen@mydomain.com;anj.dy@mydomain.com"
response = sendmail(session=session,
                    subject= "hai",
                    recipients=myRecipients.split(';'),
                    body="hai this is a new mail")

print("\nRequest headers: \n")
print(response.request.headers)

print("\nResponse: \n")
print(response) 
print(response.text) 

Answer 1

Most likely the body of your POST is not properly formatted. When I did this with the requests library, I found I needed to set data like so:

data = json.dumps(email_msg)

The default for data is to form-encode, not pass as JSON. Have a look at https://docs.microsoft.com/outlook/rest/python-tutorial#contents-of-tutorialoutlookservicepy

Answer 2

Thanks for sharing this. I had different issue when I was trying to get Graph API to send one-on-one chat message to Microsoft Teams. I could run the following code using http.client and get most of the messages posted in chat.

import http.client
headers = {'Content-type':'application/json',
            "Authorization": f"Bearer {getGraphAccessToken()}"
        }
  
body = {
       "body": {
          "contentType": "text",
         "charset" : "utf-8",
          "content": text
  }}

  connection = http.client.HTTPSConnection("graph.microsoft.com")
  connection.request("POST",f"/v1.0/chats/{chatId}/messages",headers=headers, body = str(body))