Gmail APIを使用してメールを送信するGoogle App Engine

Question

Gmail APIを使用してApp Engineにメールを送信しようとしています。以前は、資格情報ページにサービスアカウントキーを作成し、setServiceAccountPrivateKeyFromP12Fileパラメータにある.P12ファイルを生成しました。これには、アカウントのsomename@appspot.gserviceaccount.comにサービスアカウントページに結合されたIDキーがあります。コード：それは私にこのエラーが返されます

/* Application name. */ 
    private static final String APPLICATION_NAME = "appnamefromappengine"; 

    String emailAddress = "somename@appspot.gserviceaccount.com"; 
    JsonFactory JSON_FACTORY = JacksonFactory.getDefaultInstance(); 
    try { 
     HttpTransport httpTransport = GoogleNetHttpTransport.newTrustedTransport(); 

     Set<String> scopes = new HashSet<String>(); 
     scopes.add(GmailScopes.GMAIL_SEND); 
     scopes.add(GmailScopes.GMAIL_COMPOSE); 
     scopes.add(GmailScopes.MAIL_GOOGLE_COM); 
     scopes.add("https://www.googleapis.com/auth/admin.directory.user"); 

     GoogleCredential credential = new GoogleCredential.Builder() 
      .setTransport(httpTransport) 
      .setJsonFactory(JSON_FACTORY) 
      .setServiceAccountId(emailAddress) 
      .setServiceAccountPrivateKeyFromP12File(new File("/home/myuser/Test/src/main/webapp/resources/**somename**cd30e7118ad5.p12")) 
      .setServiceAccountScopes(scopes) 
      .setServiceAccountUser("somename@appspot.gserviceaccount.com") 
      .build(); 
     Gmail gmail = new Gmail 
      .Builder(httpTransport, JSON_FACTORY, credential) 
      .setApplicationName(APPLICATION_NAME) 
      .build(); 

     Properties props = new Properties(); 
     Session session = Session.getDefaultInstance(props, null); 
     MimeMessage message = new MimeMessage(session); 
     message.setFrom(new InternetAddress("someemail@gmail.com")); 
     message.addRecipient(javax.mail.Message.RecipientType.TO, new InternetAddress("recipient@gmail.com")); 
     message.setSubject("Test Mail"); 
     message.setText("Test Mail"); 

     Message msg = createMessageWithEmail(message); //createMessageWithEmail function from Gmail API 
     msg = gmail.users().messages().send(emailAddress, msg).execute(); 

     System.out.println("Mail was sent. Message id: " + msg.getId()); 

    } catch (GeneralSecurityException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } catch (IOException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } catch (MessagingException e) { 
     // TODO Auto-generated catch block 
     e.printStackTrace(); 
    } 

：

com.google.api.client.googleapis.json.GoogleJsonResponseException: 400 Bad Request { "code" : 400,
"errors" : [ { "domain" : "global", "message" : "Bad Request", "reason" : "failedPrecondition" } ],
"message" : "Bad Request" }

は、私はコード内やGoogleクラウドコンソールにここで間違って設定していたパラメータわかりません。それ以外に何ができますか？

Answer 1

問題は、ドメイン全体の権限をサービスアカウントに管理コンソールに設定しなかったことです。

1. Go to your Google Apps domain’s Admin console.

2. Select Security from the list of controls. If you don't see Security listed, select More controls from the gray bar at the bottom of the page, then select Security from the list of controls. If you can't see the controls, make sure you're signed in as an administrator for the domain.

3. Select Show more and then Advanced settings from the list of options.

4. Select Manage API client access in the Authentication section.

5. In the Client Name field enter the service account's Client ID. You can find your service account's client ID in the Service accounts section of the Developers Console's Permissions page.

6. In the One or More API Scopes field enter the list of scopes that your application should be granted access to. For example, if your application needs domain-wide access to the Google Drive API and the Google Calendar API, enter: https://www.googleapis.com/auth/drive , https://www.googleapis.com/auth/calendar .

7. Click Authorize.

すべてのドキュメント：これはSO疑問
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