Endpoint Authentication with Firebase from Google App Engine - No HTTP Token in the HTTP Request

Question

I use this:

• Front end with Google App Engine (GAE) javascript section

<script src="https://www.gstatic.com/firebasejs/3.6.8/firebase.js"></script>
  <script>
    // Initialize Firebase
    var config = {
      apiKey: "XXXXX",
      authDomain: "id-aplication.firebaseapp.com",
      databaseURL: "https://id-aplication.firebaseio.com",
      storageBucket: "id-aplication.appspot.com",
      messagingSenderId: "00000"
    };
    firebase.initializeApp(config);
  </script>

          function init(){
        
        	var apiRoot = "//id-aplication.appspot.com/_ah/api";
        	gapi.client.load('Api', "v1", callback, apiRoot);
        	
        }
        
        function createUserFirebase(){	
        	var user = firebase.auth().currentUser;
        	var request = gapi.client.Api.createUserFirebase(user);
        	request.execute(callBackResponse);
        }
        
        
        function callback(){
        	
        
        	btn = document.getElementById("input_create_user_firebase");
        	btn.onclick=function(){createUserFirebase();};
        	btn.value="Click me for Create User Firebase";
        
        	
        }

Run code

• BackEnd with Google Cloud EndPoint

@Api(name = "Api", 
	version = "v1",
	namespace = 
		@ApiNamespace( 
			ownerDomain = "api.example.com",
			ownerName = "api.example.com", packagePath = "" ),
	issuers = {
      @ApiIssuer(
        name = "firebase",
        issuer = "https://securetoken.google.com/id-aplication",
        jwksUri = "https://www.googleapis.com/robot/v1/metadata/x509/[e-mail]")
    },
    issuerAudiences = {
        @ApiIssuerAudience(name = "firebase", audiences = "id-aplication")}
    )
	public class SharedRoadApi {
		  @ApiMethod(
			  name = "firebase_user",
			  httpMethod = ApiMethod.HttpMethod.GET,
			  authenticators = {EspAuthenticator.class},
			  issuerAudiences = {@ApiIssuerAudience(name = "firebase", audiences = {"id-aplication"})}
			  )
		  public Email firebase_user(User user) throws UnauthorizedException {
			if (user == null) {
			  throw new UnauthorizedException("Invalid credentials");
			}

			Email response = new Email();
			response.setEmail(user.getEmail());
			return response;
		  }
	  }

Run code

• Authentication with Firebase

Steps:

• Firebase Authenticated Login
• Call the java method in Google Cloud EndPoint and this will not give messae "Invalid credentials", it means authenticate
• But even if you log in, report an error,

authenticate com.google.api.server.spi.auth.EspAuthenticator: Authentication failed: com.google.api.auth.UnauthenticatedException: There is no authentication token in the HTTP request (EspAuthenticator.java:86)

I would appreciate if someone would tell me what to do specifically or add, thank you very much.

Answer 1

: , . JavaScript, " OAuth 2.0".

Answer 2

gapi.client.Api.createUserFirebase()? - .

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