如何获取 Gmail 中邮件的摘要

要获取 Gmail 中邮件的摘要，我们可以使用 Gmail API。下面是使用 Python 和 Gmail API 获取邮件摘要的一般步骤：

1、问题背景

在使用 Gmail API 时，用户尝试获取邮件摘要，但始终返回空字符串。在使用 JavaScript Node SDK 和 Python SDK 时都遇到了此问题。

2、解决方案

使用 service.users().messages().get() 方法获取特定邮件的摘要。

代码语言：javascript复制

const {google} = require('googleapis');

const SCOPES = [
  'https://www.googleapis.com/auth/gmail.readonly',
];

const OAuth2 = google.auth.OAuth2;

// Create credentials object using client_secret.json file
const credentials = JSON.parse(fs.readFileSync('client_secret.json'));
const client_secret = credentials.installed.client_secret;
const client_id = credentials.installed.client_id;
const redirect_url = credentials.installed.redirect_uris[0];
const oauth2Client = new OAuth2(client_id, client_secret, redirect_url);

// Generate the url that will be used for the consent dialog.
const authorizeUrl = oauth2Client.generateAuthUrl({
  access_type: 'offline',
  scope: SCOPES
});

// Retrieve the access token from the consent dialog
const getAccessToken = (callback) => {
  console.log('Authorize this app by visiting this url: ', authorizeUrl);
  const rl = readline.createInterface({
    input: process.stdin,
    output: process.stdout
  });
  rl.question('Enter the authorization code: ', (code) => {
    rl.close();
    oauth2Client.getToken(code, (err, token) => {
      if (err) {
        console.log('Error retrieving access token', err);
        return;
      }
      callback(token);
    });
  });
};

// Use the access token to make an authenticated API call
const retrieveMessages = (token) => {
  oauth2Client.setCredentials(token);
  const service = google.gmail({version: 'v1', auth: oauth2Client});
  service.users.messages.get({
    'userId': 'me',
    'id': msg_id,
    'format': 'raw'
  }, (err, res) => {
    if (err) {
      console.log('Error retrieving messages', err);
      return;
    }
    // Print the message snippet
    console.log('Message snippet: %s', res.data.snippet);
  });
};

getAccessToken(retrieveMessages);

确保请求中包含 format=raw 参数。

代码语言：javascript复制

from __future__ import print_function

import google.auth
from googleapiclient.discovery import build
from googleapiclient.errors import HttpError


def get_message(service, user_id, msg_id, format_='metadata'):
    """Get a Message with given ID.

    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.
      msg_id: ID of Message to retrieve.
      format: Format to return message, can be 'metadata' or 'full'

    Returns:
      Message object, or None when Message not found.
    """
    try:
        message = service.users().messages().get(
            userId=user_id, id=msg_id, format=format_).execute()
        print(F'Message snippet: {message["snippet"]}')
        return message
    except HttpError as error:
        print(F'An error occurred: {error}')
        return None


def main():
    """Shows basic usage of the Gmail API.

    Creates a Gmail API client object and retrieves a recent email message.
    """
    creds, _ = google.auth.default()
    # pylint: disable=maybe-no-member
    service = build('gmail', 'v1', credentials=creds)
    get_message(service, 'me', '146fccb21d960498', 'raw')


if __name__ == '__main__':
    main()

最后需要注意的是，此脚本仅获取了收件箱中的最新邮件的摘要。我们可以根据需要对其进行扩展，以获取更多邮件的信息或者根据特定标签过滤邮件等。

爬虫 gmail爬虫游戏

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