【自作Pythonコード解説 YMM4編④】動画投稿も全自動！YouTube Data API v3の「OAuth認証」をコピペで攻略する方法

import os
from googleapiclient.discovery import build
from googleapiclient.http import MediaFileUpload
from google_auth_oauthlib.flow import InstalledAppFlow
from google.auth.transport.requests import Request
from google.oauth2.credentials import Credentials

# 設定：認証ファイルのパス
# 自分の環境に合わせて書き換えてね
BASE_DIR = r"C:\Users\AIGURUI\Desktop\AIラジオ"
CLIENT_SECRET_FILE = os.path.join(BASE_DIR, "client_secret.json")
SCOPES = ["https://www.googleapis.com/auth/youtube.upload"]

def get_authenticated_service():
    """OAuth2.0認証を行い、YouTubeリソースを返す関数"""
    creds = None
    token_path = os.path.join(BASE_DIR, "token.json")

    # すでにトークンがある場合は再利用
    if os.path.exists(token_path):
        creds = Credentials.from_authorized_user_file(token_path, SCOPES)
    
    # トークンがない、または期限切れの場合は再認証
    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(CLIENT_SECRET_FILE, SCOPES)
            creds = flow.run_local_server(port=0)
        
        # 次回用にトークンを保存
        with open(token_path, "w") as token:
            token.write(creds.to_json())

    return build("youtube", "v3", credentials=creds)

def upload_video(video_path, title, description):
    """動画をアップロードするメイン処理"""
    youtube = get_authenticated_service()

    body = {
        "snippet": {
            "title": title,
            "description": description,
            "tags": ["AI", "Python", "Automation"],
            "categoryId": "22" # 22=People & Blogs
        },
        "status": {
            "privacyStatus": "private", # 最初は非公開が安全！
            "selfDeclaredMadeForKids": False
        }
    }

    # アップロード実行（リジューム可能モード）
    media = MediaFileUpload(video_path, chunksize=-1, resumable=True)
    request = youtube.videos().insert(
        part=",".join(body.keys()),
        body=body,
        media_body=media
    )
    
    print("アップロード中...")
    response = request.execute()
    print(f"完了！動画ID: {response['id']}")