Using Facebook Login, why does Amplify (using Auth.currentAuthenticatedUser()) not work immediately after login, but if I refresh the app (Command + R in the iOS simulator), the user is recognized?

** Which Category is your question related to? ** Amplify Facebook Login Integration

** What AWS Services are you utilizing? ** Amplify, Auth

** Provide additional details e.g. code snippets **

code is now working - here’s the snippet

 import { 
   CognitoUser, 
   CognitoIdToken, 
   CognitoAccessToken, 
   CognitoRefreshToken, 
   CognitoUserSession, 
   CognitoUserPool } from 'amazon-cognito-identity-js';
 //import { withOAuth } from 'aws-amplify-react-native'
 const userPool = new CognitoUserPool({
   UserPoolId: config.aws_user_pools_id,
   ClientId: config.aws_user_pools_web_client_id,
 });

   import { AuthSession } from 'expo'
  // Open URL in a browser
  openURL = async (url) => {
      try {
        let result = await AuthSession.startAsync({ authUrl: url })
        this.getTokenbyCode(result.params.code)
      } catch(openURLError) {
        console.log(`openURLError: ${openURLError}`)
      }
    }

   getTokenbyCode = async (code) => {

      const details = {
        grant_type: 'authorization_code',
        code,
        client_id: userPool.clientId,
        redirect_uri: AuthSession.getRedirectUrl()
      }
      const formBody = Object.keys(details)
        .map(
          key => `${encodeURIComponent(key)}=${encodeURIComponent(details[key])}`
        )
        .join("&");

     try {
        let res = await fetch(
        'https://DOMAIN.auth.us-west-2.amazoncognito.com/oauth2/token',
          {
            method: "POST",
            headers: {
              'Content-type': 'application/x-www-form-urlencoded;charset=UTF-8'
            },
            body: formBody
          }
        )
        let tokenRequestJson = await res.json();
        const IdToken = new CognitoIdToken({ IdToken: tokenRequestJson.id_token });
        const AccessToken = new CognitoAccessToken({ AccessToken: tokenRequestJson.access_token });
        const RefreshToken = new CognitoRefreshToken({ RefreshToken: tokenRequestJson.refresh_token 
        })
          try {
            let userSession = new CognitoUserSession({ IdToken, AccessToken, RefreshToken });
            
            const userData = {
              Username: IdToken.payload['cognito:username'],
              Pool: userPool
            };
            let authUser = Auth.createCognitoUser(userData.Username); // THIS NOW WORKS
            let authSession = await Auth.userSession(authUser)
            let authCurrentUser = Auth.currentAuthenticatedUser()
          } catch (userError) {
         //HANDLE USERERROR
          }
      } catch (fetchError) {
         //HANDLE FETCHERROR
      }

[alecsutzuu]

@cmaronchick I’ve been really struggling with oauth amplify for expo as well. If it’s not too much to ask can you please help me with your working code? I can’t seem to get it work with Fb login or Google login 😦

[cmaronchick]

Thanks. I figured this out, and you should update your documentation.

this line is incorrect: let authUser = Auth.createCognitoUser(userData); It should read this: let authUser = Auth.createCognitoUser(cognitoUser.getUsername());

Regarding your documentation, it is not at all straightforward. I tried it out and got an error saying that response.token is undefined.

Since my solution is working (I’m using Expo FWIW), I’m going to stick with the hack, unless you’d like to update your documentation to make it easier.