Gmail 本文取得

pythonでGmail 本文取得

まずラベルを指定して取得するには
ラベルIDが必要になる

vim base.py

で

from __future__ import print_function
import os.path
from googleapiclient.discovery import build
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials

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

import base64, email #デコード用
import dateutil.parser

#token.jsonを設定
tokenPath = "token.json"

#credentials.jsonを設定
credentialsPath = "credentials.json"


#メール本文のデコード
def decode(encoded):
   decoded = base64.urlsafe_b64decode(encoded).decode()
   return decoded


#メール本文の内容を配列で取得する関数
def gmail_get_messages_body(service, labelIdsValue):
   mailBody = []
   
   # メッセージの一覧を取得
   messages = service.users().messages()
   msg_list = messages.list(userId='me', labelIds=labelIdsValue).execute() 
   # msg_list = messages.list(userId='me', labelIds=labelIdsValue ,maxResults=456).execute() #最大値指定
   
   # 取得したメッセージの一覧を配列に格納
   for msg in msg_list['messages']:
       
       #メールの受信日時を取得
       date = gmail_get_messages_body_date(messages,msg)
       
       topid = msg['id']     
       msg = messages.get(userId='me', id=topid).execute()
       
       if(msg["payload"]["body"]["size"]!=0):
           mailBody.append(date+"<br>"+decode(msg["payload"]["body"]["data"])) 
       else:
           #メールによっては"parts"属性の中に本文がある場合もある
           mailBody.append(date+"<br>"+decode(msg["payload"]["parts"][0]["body"]["data"])) 

   return mailBody
   

#gmail_get_messages_body関数内で受信日時を取得する関数
def gmail_get_messages_body_date(messages,msg):
   msg_id = msg['id']
   m = messages.get(userId='me', id=msg_id, format='raw').execute()
   raw = base64.urlsafe_b64decode(m['raw'])
   
   # Emailを解析する
   eml = email.message_from_bytes(raw)
   
   date = dateutil.parser.parse(eml.get('Date')).strftime("%Y-%m-%d_%H-%M-%S")
   return date

#ラベルのIDやnameを表示する関数
def gmail_display_label(service):
   results = service.users().labels().list(userId='me').execute()
   labels = results.get('labels', [])

   if not labels:
       print('No labels found.')
   else:
       print('Labels:')
       for label in labels:
           print(label)


#初期化(from quickstart.py)
def gmail_init():
   creds = None
   # The file token.json 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(tokenPath):
       creds = Credentials.from_authorized_user_file(tokenPath, SCOPES)
   # 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(
               credentialsPath, SCOPES)
           creds = flow.run_local_server(port=0)
       # Save the credentials for the next run
       with open(tokenPath, 'w') as token:
           token.write(creds.to_json())
           
   service = build('gmail', 'v1', credentials=creds)
   return service


#ここからやりたい処理を書く
service = gmail_init()

#quickstart.pyと同じ処理にしてみた
results = service.users().labels().list(userId='me').execute()
labels = results.get('labels', [])

if not labels:
   print('No labels found.')
else:
   print('Labels:')
   for label in labels:
       print(label['name'])
       
gmail_display_label(service)

として

python base.py

を実行すると
ラベルとID一覧が表示される

これでラベルIDがわかったので本文を取得するようにコード変更

from __future__ import print_function
import os.path
from googleapiclient.discovery import build
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials
import base64
import email
import dateutil.parser

# スコープの設定
SCOPES = ['https://www.googleapis.com/auth/gmail.readonly']

# トークンとクレデンシャルのパス
tokenPath = "token.json"
credentialsPath = "credentials.json"

# メール本文のデコード関数
def decode(encoded):
    decoded = base64.urlsafe_b64decode(encoded).decode()
    return decoded

# メール本文を取得する関数
def gmail_get_messages_body(service, labelIdsValue):
    mailBody = []
    messages = service.users().messages()
    msg_list = messages.list(userId='me', labelIds=labelIdsValue).execute()

    for msg in msg_list['messages']:
        date = gmail_get_messages_body_date(messages, msg)
        topid = msg['id']
        msg = messages.get(userId='me', id=topid).execute()

        # メールの本文を取得
        if msg["payload"]["body"]["size"] != 0:
            mailBody.append(date + "<br>" + decode(msg["payload"]["body"]["data"]))
        elif 'parts' in msg["payload"]:
            # メール本文が parts 属性にある場合
            for part in msg["payload"]["parts"]:
                if part["body"]["size"] != 0:
                    mailBody.append(date + "<br>" + decode(part["body"]["data"]))
                    break
        else:
            mailBody.append(date + "<br> No body content")

    return mailBody

# メールの受信日時を取得する関数
def gmail_get_messages_body_date(messages, msg):
    msg_id = msg['id']
    m = messages.get(userId='me', id=msg_id, format='raw').execute()
    raw = base64.urlsafe_b64decode(m['raw'])
    eml = email.message_from_bytes(raw)
    date = dateutil.parser.parse(eml.get('Date')).strftime("%Y-%m-%d_%H-%M-%S")
    return date

# ラベルの表示関数（変更なし）
def gmail_display_label(service):
    results = service.users().labels().list(userId='me').execute()
    labels = results.get('labels', [])

# Gmail API 初期化関数（変更なし）
def gmail_init():
    creds = None
    if os.path.exists(tokenPath):
        creds = Credentials.from_authorized_user_file(tokenPath, SCOPES)
    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(
                credentialsPath, SCOPES)
            creds = flow.run_local_server(port=0)
        with open(tokenPath, 'w') as token:
            token.write(creds.to_json())
    service = build('gmail', 'v1', credentials=creds)
    return service

# メイン処理
service = gmail_init()
gmail_display_label(service)

# ラベル ID を指定してメール本文を取得
mail_bodies = gmail_get_messages_body(service, "Label_4")
for body in mail_bodies:
    print(body)

これで

python base.py

とすると
Lavel_4のIDのメールの本文を表示することができる