Android：GoogleIdTokenVerifier.BuilderのトランスポートとjsonFactoryとは何ですか？
ブローコードでは、transportとjsonFactoryは何ですか？ （理解できません）
import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken;
import com.google.api.client.googleapis.auth.oauth2.GoogleIdToken.Payload;
import com.google.api.client.googleapis.auth.oauth2.GoogleIdTokenVerifier;
...
GoogleIdTokenVerifier verifier = new GoogleIdTokenVerifier.Builder(transport /**Here**/, jsonFactory /**Here**/)
.setAudience(Arrays.asList(CLIENT_ID))
// If you retrieved the token on Android using the Play Services 8.3 API or newer, set
// the issuer to "https://accounts.google.com". Otherwise, set the issuer to
// "accounts.google.com". If you need to verify tokens from multiple sources, build
// a GoogleIdTokenVerifier for each issuer and try them both.
.setIssuer("https://accounts.google.com")
.build();
// (Receive idTokenString by HTTPS POST)
GoogleIdToken idToken = verifier.verify(idTokenString);
if (idToken != null) {
Payload payload = idToken.getPayload();
// Print user identifier
String userId = payload.getSubject();
System.out.println("User ID: " + userId);
// Get profile information from payload
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");
// Use or store profile information
// ...
} else {
System.out.println("Invalid ID token.");
}
GoogleIdTokenVerifier.Builder は、 transken を使用して tokeninfoエンドポイント にリクエストを送信するGoogleIdTokenVerifierを返します （ JSONFactory は、応答を解析するパーサーを作成します。
これは、GoogleIdTokenVerifier.Builderを使用するCloud Endpointsプロジェクトの認証子の例です。
public class GoogleAuthenticator implements Authenticator {
private static final Logger log = Logger.getLogger(GoogleAuthenticator.class.getName());
private static final JacksonFactory jacksonFactory = new JacksonFactory();
// From: https://developers.google.com/identity/sign-in/Android/backend-auth#using-a-google-api-client-library
// If you retrieved the token on Android using the Play Services 8.3 API or newer, set
// the issuer to "https://accounts.google.com". Otherwise, set the issuer to
// "accounts.google.com". If you need to verify tokens from multiple sources, build
// a GoogleIdTokenVerifier for each issuer and try them both.
GoogleIdTokenVerifier verifierForNewAndroidClients = new GoogleIdTokenVerifier.Builder(UrlFetchTransport.getDefaultInstance(), jacksonFactory)
.setAudience(Arrays.asList(CRLConstants.IOS_CLIENT_ID, CRLConstants.Android_CLIENT_ID_RELEASE, CRLConstants.Android_CLIENT_ID_DEBUG))
.setIssuer("https://accounts.google.com")
.build();
GoogleIdTokenVerifier verifierForOtherClients = new GoogleIdTokenVerifier.Builder(UrlFetchTransport.getDefaultInstance(), jacksonFactory)
.setAudience(Arrays.asList(CRLConstants.IOS_CLIENT_ID, CRLConstants.Android_CLIENT_ID_RELEASE, CRLConstants.Android_CLIENT_ID_DEBUG))
.setIssuer("accounts.google.com")
.build();
// Custom Authenticator class for authenticating google accounts
@Override
public User authenticate(HttpServletRequest request) {
String token = request.getHeader("google_id_token");
if (token != null) {
GoogleIdToken idToken = null;
try {
idToken = verifierForNewAndroidClients.verify(token);
if(idToken == null) idToken = verifierForOtherClients.verify(token);
if (idToken != null) {
GoogleIdToken.Payload payload = idToken.getPayload();
// Get profile information from payload
String userId = payload.getSubject();
String email = payload.getEmail();
return new GoogleUser(userId, email);
} else {
log.warning("Invalid Google ID token.");
}
} catch (GeneralSecurityException e) {
log.warning(e.getLocalizedMessage());
} catch (IOException e) {
log.warning(e.getLocalizedMessage());
}
}
return null;
}
}
コードを実行しているプラットフォームに応じてトランスポートを選択する必要があります。
ドキュメントからの引用
Implementation is thread-safe, and sub-classes must be thread-safe. For maximum efficiency, applications should use a single globally-shared instance of the HTTP transport.
The recommended concrete implementation HTTP transport library to use depends on what environment you are running in:
Google App Engine: use com.google.api.client.extensions.appengine.http.UrlFetchTransport.
com.google.api.client.Apache.ApacheHttpTransport doesn't work on App Engine because the Apache HTTP Client opens its own sockets (though in theory there are ways to hack it to work on App Engine that might work).
com.google.api.client.javanet.NetHttpTransport is discouraged due to a bug in the App Engine SDK itself in how it parses HTTP headers in the response.
Android:
For maximum backwards compatibility with older SDK's use newCompatibleTransport from com.google.api.client.extensions.Android.http.AndroidHttp (read its JavaDoc for details).
If your application is targeting Gingerbread (SDK 2.3) or higher, simply use com.google.api.client.javanet.NetHttpTransport.
Other Java environments
com.google.api.client.javanet.NetHttpTransport is based on the HttpURLConnection built into the Java SDK, so it is normally the preferred choice.
com.google.api.client.Apache.ApacheHttpTransport is a good choice for users of the Apache HTTP Client, especially if you need some of the configuration options available in that library.
質問の2番目の答えを盲目的に実行すると、例外が発生しますCaused by: Java.lang.ClassNotFoundException: com.google.appengine.api.urlfetch.HTTPMethod