Gmail api：如何使用 ID 获取收件人的电子邮件？

Question

I'm trying to get the recipient's email using the ID that I have retrieved. Below is the code.

messages = service.users().threads().list(userId='me', q='to:').execute().get('threads', [])
    for message in messages:
        #print(message)
        # print(dir(message))
        # print(message.get())
        if search in message['snippet']:
            #print(message['id'])
            message_id = message['id']
            # print(message_id)
            full_message = service.users().messages().get(userId='me', id=message_id, format="raw").execute()
            #print(full_message)
            msg_headers = full_message['payload']['headers']
            #print(msg_headers)
            msg_str = base64.urlsafe_b64decode(full_message['raw'].encode('ASCII'))
            mime_msg = email.message_from_bytes(msg_str)

            #print(mime_msg)

            x = re.findall('id=(\w+)\'', str(mime_msg))
            print(x)
            if len(x)> 0:
                return x[0]
                if msg_headers[x]['name'] == "To":
                    return msg_headers[x[0]]['value']
            else:
                return None

I get the error below. How do I resolve this?

Traceback (most recent call last):
  File "C:\test\test2.py", line 102, in <module>
    test = get_email_with("Test string")
  File "C:\test\test2.py", line 55, in get_email_with
    msg_headers = full_message['payload']['headers']
KeyError: 'payload'

Answer 1

The response from Gmail can be a little confusing. You are on the right track with

 msg_headers = full_message['payload']['headers']

One of the headers is called has a name of "Delivered-To" the value will be the email address that the mail was sent to. So basiclly you need to search your msg_headers and find the one called "Delivered-To"

Unfortunately i am not a python dev i cant help you with the code. Python quickstart may give you some ideas on how to get the response out of the object.

response

 "payload": {
    "partId": "",
    "mimeType": "multipart/alternative",
    "filename": "",
    "headers": [
      {
        "name": "Delivered-To",
        "value": "xxxx@gmail.com"
      },

Answer 2

Issue:

When the format is set to RAW , the field payload is not populated in the response.

From the API official docs :

RAW : Returns the full email message data with body content in the raw field as a base64url encoded string; the payload field is not used .

Solution:

Use either FULL or METADATA as format when calling messages().get , instead of RAW (format is an option parameter, and if it is not specified, FULL is used as default).

So you should change this:

full_message = service.users().messages().get(userId='me', id=message_id, format="raw").execute()

To this:

full_message = service.users().messages().get(userId='me', id=message_id).execute()

Or, alternatively, use format="raw" anyway and decode the base-64 encoded string full_message["raw"] . Edit : In this case, though, you'd have to remove this line: msg_headers = full_message['payload']['headers'] .

Edit:

So, if you want to retrieve the recipient, you can do the following:

full_message = service.users().messages().get(userId='me', id=message_id).execute()
msg_headers = full_message['payload']['headers']
for header in msg_headers:
    if header["name"] == "To":
        return header["value"]

Reference:

• API reference > Format