使用Gmail API发送大于10mb的附件

import base64
import mimetypes
import os
from googleapiclient.discovery import build
from googleapiclient.errors import HttpError
from google.oauth2 import service_account
from googleapiclient.http import MediaFileUpload

# 设置凭据文件的路径
credentials_path = '/path/to/credentials.json'

# 创建Gmail API的服务对象
credentials = service_account.Credentials.from_service_account_file(credentials_path, scopes=['https://www.googleapis.com/auth/gmail.compose'])
service = build('gmail', 'v1', credentials=credentials)

def send_email_with_large_attachment(sender, to, subject, message_text, attachment_path):
    try:
        # 创建邮件主体
        message = create_message_with_attachment(sender, to, subject, message_text, attachment_path)
        
        # 发送邮件
        send_message(message)
        
        print("邮件发送成功！")
    except HttpError as error:
        print("邮件发送失败：{}".format(error))

def create_message_with_attachment(sender, to, subject, message_text, attachment_path):
    # 创建邮件主体
    message = create_message(sender, to, subject, message_text)
    
    # 添加附件
    message = add_attachment_to_message(message, attachment_path)
    
    return message

def create_message(sender, to, subject, message_text):
    # 创建邮件主体
    message = {
        'from': sender,
        'to': to,
        'subject': subject,
        'text': message_text
    }
    
    return message

def add_attachment_to_message(message, attachment_path):
    # 获取附件的文件名和MIME类型
    filename = os.path.basename(attachment_path)
    content_type, encoding = mimetypes.guess_type(attachment_path)
    
    # 如果MIME类型无法识别，则默认为二进制流
    if content_type is None or encoding is not None:
        content_type = 'application/octet-stream'
    
    # 读取附件内容并进行Base64编码
    with open(attachment_path, 'rb') as file:
        attachment_data = file.read()
    attachment_data_base64 = base64.urlsafe_b64encode(attachment_data).decode('utf-8')
    
    # 创建附件对象
    attachment = {
        'filename': filename,
        'mimeType': content_type,
        'data': attachment_data_base64
    }
    
    # 将附件添加到邮件主体中
    message['attachments'] = [attachment]
    
    return message

def send_message(message):
    # 发送邮件
    service.users().messages().send(userId='me', body=message).execute()

# 使用示例
sender = 'your_email@gmail.com'
to = 'recipient@example.com'
subject = '邮件主题'
message_text = '邮件正文'
attachment_path = '/path/to/attachment.pdf'

send_email_with_large_attachment(sender, to, subject, message_text, attachment_path)