从java程序打开浏览器获取Google授权，询问已获得许可 [英] Get Google authorization from java program open browser for asking already given permission

问题描述

为了让一个java程序访问我的谷歌驱动器，我需要使用json凭证文件创建一个oauth2.Credential（请参阅

如果我点击按钮允许，创建Credential并且获得一个令牌。

  System.out.println（token+ credential.getAccessToken（））; 
  

问题是这个java程序将是一个批处理程序所以我们不能要求该批次点击按钮。

另外在

你知道如何在没有Java程序打开浏览器的情况下获得凭证以获取许可？
谢谢

这里是完整的代码：

  public static void getToken（）{
 HttpTransport httpTransport; 
 InputStream inputStream; 
尝试{
 httpTransport = GoogleNetHttpTransport.newTrustedTransport（）; 
列表< String> scope = Arrays.asList（DriveScopes.DRIVE）; 
 inputStream = new FileInputStream（C：/dev/ws/mainAzure/GoogleTest/res/client_secret_jcb_inst.json）; 
 InputStreamReader reader = new InputStreamReader（inputStream）; 
 clientSecrets = GoogleClientSecrets.load（JSON_FACTORY，reader）; 
 GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder（
 httpTransport 
，JSON_FACTORY 
，clientSecrets 
，scope）
 .setAccessType（offline）
 .setApprovalPrompt（force）
 .build（）; 
 
 //在新的AuthorizationCodeInstalledApp（...）
凭证凭证=新的AuthorizationCodeInstalledApp（流
，新的LocalServerReceiver（））
 .authorize（ user）
; 
 System.out.println（token+ credential.getAccessToken（））; 
} catch（Exception e）{
 e.printStackTrace（）; 
 
 
 $ / code> 




解决方案

After一些帮助（谢谢你哈罗德）我可以找到解决方案：
一个需要定义一个datastorefactory，在其他地方refreshToken没有存储在一个文件中，谷歌通过互联网浏览器每次都要求权限。
所以我补充说：



  dataStoreFactory = new FileDataStoreFactory（new File（C：/ dev / ws / mainAzure / GoogleTest / RES））; 
  

和：



  GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder（
 httpTransport 
，JSON_FACTORY 
，clientSecrets 
，scope）
 .setAccessType（offline）
 .setApprovalPrompt（force）
 .build（）; 
  

成为：

  flow = new GoogleAuthorizationCodeFlow.Builder（
 httpTransport 
，JSON_FACTORY 
，clientSecrets 
，作用域）
 .setAccessType（offline）
 .setDataStoreFactory（dataStoreFactory）
 .setApprovalPrompt（force）
 .build（）; 
  

此外，如果访问次数不限制为1小时，则需要刷新令牌：

  credential.refreshToken（）; 
  




In order for a java program to access my google drive I need to create an oauth2.Credential using a json credential file (see https://console.developers.google.com) for getting an access token.

The problem is when I create the Credential java instance the java program open Internet Explorer and ask permission for Drive.

Credential credential = new AuthorizationCodeInstalledApp(flow
                 , new LocalServerReceiver())
                 .authorize("user")
                 ;

If I click button "allow" , Credential is created and I get a token.

 System.out.println("token" + credential.getAccessToken());

The problem is that this java program will be a batch program so we can't ask the batch to click on a button.

Furthermore in https://security.google.com/settings/security/permissions?pli=1 my Drive has already given access to my application (application name is GoogleTest) ...

Do you know how to get the credential without java program open browser for asking permission ? Thank you

Here the full code :

 public static void getToken ()  {
     HttpTransport httpTransport ;
     InputStream inputStream;       
     try {
         httpTransport = GoogleNetHttpTransport.newTrustedTransport();
         List<String> scope = Arrays.asList(DriveScopes.DRIVE);
         inputStream = new FileInputStream("C:/dev/ws/mainAzure/GoogleTest/res/client_secret_jcb_inst.json");
         InputStreamReader reader = new InputStreamReader(inputStream);
         clientSecrets = GoogleClientSecrets.load(JSON_FACTORY,reader);                             
         GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
            httpTransport
             , JSON_FACTORY
             ,clientSecrets
             , scope)
             .setAccessType("offline")
             .setApprovalPrompt("force")
             .build();                  

         //Browser open when there is new AuthorizationCodeInstalledApp(...)
         Credential credential =    new AuthorizationCodeInstalledApp(flow
             , new LocalServerReceiver())
             .authorize("user")
             ;
     System.out.println("token" + credential.getAccessToken());
     } catch (Exception e) {
         e.printStackTrace();
     }
 }

解决方案

After some help (thank you Harold) I could find the solution: One need to define a datastorefactory, elsewhere the refreshToken is not stored in a file and Google via Internet browser ask for permission each time. So I added :

dataStoreFactory = new FileDataStoreFactory(new File("C:/dev/ws/mainAzure/GoogleTest/res"));

and :

 GoogleAuthorizationCodeFlow flow = new GoogleAuthorizationCodeFlow.Builder(
            httpTransport
             , JSON_FACTORY
             ,clientSecrets
             , scope)
             .setAccessType("offline")
             .setApprovalPrompt("force")
             .build(); 

become :

            flow = new GoogleAuthorizationCodeFlow.Builder(
                httpTransport
                 , JSON_FACTORY
                 ,clientSecrets
                 , scope)                     
                 .setAccessType("offline")
                 .setDataStoreFactory(dataStoreFactory)
                 .setApprovalPrompt("force")                 
                 .build();

Furthermore to have an access non limited to 1 hour, one need to refresh the token :

credential.refreshToken() ;

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