Mengaktifkan Akses Sisi Server

Dengan prosedur Add Sign-In sebelumnya , aplikasi Anda mengautentikasi pengguna hanya di sisi klien; dalam hal ini, Anda dapat mengakses Google API hanya saat pengguna secara aktif menggunakan aplikasi Anda. Jika Anda ingin server Anda dapat melakukan panggilan Google API atas nama pengguna — mungkin saat mereka offline — server Anda memerlukan token akses.

Sebelum kamu memulai

Aktifkan akses API sisi server untuk aplikasi Anda

  1. Saat Anda mengonfigurasi Google Sign-In , buat objek GoogleSignInOptions dengan metode requestServerAuthCode dan tentukan cakupan yang perlu diakses backend aplikasi Anda dengan metode requestScopes .

    Teruskan ID klien server Anda ke metode requestServerAuthCode .

    // Configure sign-in to request offline access to the user's ID, basic
    // profile, and Google Drive. The first time you request a code you will
    // be able to exchange it for an access token and refresh token, which
    // you should store. In subsequent calls, the code will only result in
    // an access token. By asking for profile access (through
    // DEFAULT_SIGN_IN) you will also get an ID Token as a result of the
    // code exchange.
    String serverClientId = getString(R.string.server_client_id);
    GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
            .requestScopes(new Scope(Scopes.DRIVE_APPFOLDER))
            .requestServerAuthCode(serverClientId)
            .requestEmail()
            .build();
  2. Setelah pengguna berhasil getServerAuthCode , dapatkan kode getServerAuthCode untuk pengguna dengan getServerAuthCode :

    Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
    try {
        GoogleSignInAccount account = task.getResult(ApiException.class);
        String authCode = account.getServerAuthCode();
    
        // Show signed-un UI
        updateUI(account);
    
        // TODO(developer): send code to server and exchange for access/refresh/ID tokens
    } catch (ApiException e) {
        Log.w(TAG, "Sign-in failed", e);
        updateUI(null);
    }
  3. Kirim kode autentikasi ke backend aplikasi Anda menggunakan HTTPS POST:

    HttpPost httpPost = new HttpPost("https://yourbackend.example.com/authcode");
    
    try {
        List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>(1);
        nameValuePairs.add(new BasicNameValuePair("authCode", authCode));
        httpPost.setEntity(new UrlEncodedFormEntity(nameValuePairs));
    
        HttpResponse response = httpClient.execute(httpPost);
        int statusCode = response.getStatusLine().getStatusCode();
        final String responseBody = EntityUtils.toString(response.getEntity());
    } catch (ClientProtocolException e) {
        Log.e(TAG, "Error sending auth code to backend.", e);
    } catch (IOException e) {
        Log.e(TAG, "Error sending auth code to backend.", e);
    }
    
  4. Di server backend aplikasi Anda, tukarkan kode autentikasi dengan akses dan segarkan token. Gunakan token akses untuk memanggil Google API atas nama pengguna dan, secara opsional, simpan token penyegaran untuk mendapatkan token akses baru ketika token akses kedaluwarsa.

    Jika Anda meminta akses profil, Anda juga mendapatkan token ID yang berisi informasi profil dasar untuk pengguna tersebut.

    Sebagai contoh:

    Jawa
    // (Receive authCode via HTTPS POST)
    
    
    if (request.getHeader("X-Requested-With") == null) {
      // Without the `X-Requested-With` header, this request could be forged. Aborts.
    }
    
    // Set path to the Web application client_secret_*.json file you downloaded from the
    // Google API Console: https://console.developers.google.com/apis/credentials
    // You can also find your Web application client ID and client secret from the
    // console and specify them directly when you create the GoogleAuthorizationCodeTokenRequest
    // object.
    String CLIENT_SECRET_FILE = "/path/to/client_secret.json";
    
    // Exchange auth code for access token
    GoogleClientSecrets clientSecrets =
        GoogleClientSecrets.load(
            JacksonFactory.getDefaultInstance(), new FileReader(CLIENT_SECRET_FILE));
    GoogleTokenResponse tokenResponse =
              new GoogleAuthorizationCodeTokenRequest(
                  new NetHttpTransport(),
                  JacksonFactory.getDefaultInstance(),
                  "https://oauth2.googleapis.com/token",
                  clientSecrets.getDetails().getClientId(),
                  clientSecrets.getDetails().getClientSecret(),
                  authCode,
                  REDIRECT_URI)  // Specify the same redirect URI that you use with your web
                                 // app. If you don't have a web version of your app, you can
                                 // specify an empty string.
                  .execute();
    
    String accessToken = tokenResponse.getAccessToken();
    
    // Use access token to call API
    GoogleCredential credential = new GoogleCredential().setAccessToken(accessToken);
    Drive drive =
        new Drive.Builder(new NetHttpTransport(), JacksonFactory.getDefaultInstance(), credential)
            .setApplicationName("Auth Code Exchange Demo")
            .build();
    File file = drive.files().get("appfolder").execute();
    
    // Get profile info from ID token
    GoogleIdToken idToken = tokenResponse.parseIdToken();
    GoogleIdToken.Payload payload = idToken.getPayload();
    String userId = payload.getSubject();  // Use this value as a key to identify a user.
    String email = payload.getEmail();
    boolean emailVerified = Boolean.valueOf(payload.getEmailVerified());
    String name = (String) payload.get("name");
    String pictureUrl = (String) payload.get("picture");
    String locale = (String) payload.get("locale");
    String familyName = (String) payload.get("family_name");
    String givenName = (String) payload.get("given_name");
    
    Python
    from apiclient import discovery
    import httplib2
    from oauth2client import client
    
    # (Receive auth_code by HTTPS POST)
    
    
    # If this request does not have `X-Requested-With` header, this could be a CSRF
    if not request.headers.get('X-Requested-With'):
        abort(403)
    
    # Set path to the Web application client_secret_*.json file you downloaded from the
    # Google API Console: https://console.developers.google.com/apis/credentials
    CLIENT_SECRET_FILE = '/path/to/client_secret.json'
    
    # Exchange auth code for access token, refresh token, and ID token
    credentials = client.credentials_from_clientsecrets_and_code(
        CLIENT_SECRET_FILE,
        ['https://www.googleapis.com/auth/drive.appdata', 'profile', 'email'],
        auth_code)
    
    # Call Google API
    http_auth = credentials.authorize(httplib2.Http())
    drive_service = discovery.build('drive', 'v3', http=http_auth)
    appfolder = drive_service.files().get(fileId='appfolder').execute()
    
    # Get profile info from ID token
    userid = credentials.id_token['sub']
    email = credentials.id_token['email']
    
    .dll