java - 通过在没有 SharedPreferences 的情况下使用 Google 登录自动登录

Question

我尝试将静默登录实现为 mentioned here

我试过通过正则表达式限制其他域登录，不知道有没有其他方法，我在Firebase登录中看到了'hd'参数，但是实现不成功。

编辑 1:固定代码，现在静默登录不起作用。代码是多余的，GoogleApiClient 也已弃用。

我已经看到使用 SharedPreferences 保存登录 token 的答案，但是保存 token 安全吗？

我关注了 documentation here

主 Activity .java

        mAuth = FirebaseAuth.getInstance();

        if(mAuth.getCurrentUser() != null) {
            silentLogin();
        }

        GoogleSignInOptions gso = new GoogleSignInOptions.Builder(GoogleSignInOptions.DEFAULT_SIGN_IN)
                .requestIdToken(getString(R.string.default_web_client_id))
                .requestEmail()
                .build();

        mGoogleSignInClient = GoogleSignIn.getClient(this, gso);

        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .enableAutoManage(this, this)
                .addApi(Auth.GOOGLE_SIGN_IN_API, gso)
                .build();

       //Show sign-in and sign-out buttons

    public void silentLogin() {
        OptionalPendingResult<GoogleSignInResult> pendingResult =
                Auth.GoogleSignInApi.silentSignIn(mGoogleApiClient);
        if (pendingResult != null) {
            handleGooglePendingResult(pendingResult);
        } else {
            signIn();
        }
    }
        private void handleGooglePendingResult(OptionalPendingResult<GoogleSignInResult> pendingResult) {
        if (pendingResult.isDone()) {
            GoogleSignInResult signInResult = pendingResult.get();
            onSilentSignInCompleted(signInResult);
        } else {
            pendingResult.setResultCallback(new ResultCallback<GoogleSignInResult>() {
                @Override
                public void onResult(@NonNull GoogleSignInResult signInResult) {
                    onSilentSignInCompleted(signInResult);
                }
            });
        }
    }

    private void onSilentSignInCompleted(GoogleSignInResult signInResult) {
        GoogleSignInAccount signInAccount = signInResult.getSignInAccount();
        if (signInAccount != null) {
            //Show sign out button
        }
        else {
            signIn();
        }
    }

    private void signIn(){
        Intent signInIntent = mGoogleSignInClient.getSignInIntent();
        startActivityForResult(signInIntent, RC_SIGN_IN);
    }

    @Override
    protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
        super.onActivityResult(requestCode, resultCode, data);
        if(requestCode == RC_SIGN_IN){
            Task<GoogleSignInAccount> task = GoogleSignIn.getSignedInAccountFromIntent(data);
            handleSignInResult(task);
        }
    }

    private void handleSignInResult(Task<GoogleSignInAccount> completedTask){
        try{
            GoogleSignInAccount acc = completedTask.getResult(ApiException.class);
            FirebaseGoogleAuth(acc);
        }
        catch (ApiException e){
            //Show error
            FirebaseGoogleAuth(null);
        }
    }

    private void FirebaseGoogleAuth(GoogleSignInAccount acct) {
        if (acct != null) {
            AuthCredential authCredential = GoogleAuthProvider.getCredential(acct.getIdToken(), null);
            mAuth.signInWithCredential(authCredential).addOnCompleteListener(this, new OnCompleteListener<AuthResult>() {
                @Override
                public void onComplete(@NonNull Task<AuthResult> task) {
                    if (task.isSuccessful()) {
                        FirebaseUser user = mAuth.getCurrentUser();
                        updateUI(user);
                    } else {
                        updateUI(null);
                    }
                }
            });
        }
        else{
            // Auth failed
        }
    }

    private void updateUI(FirebaseUser fUser){
        GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(getApplicationContext());
        if(account !=  null){
            String personName = account.getDisplayName();
            String personEmail = account.getEmail();

            if (personEmail != null) {
                if(personEmail.endsWith("gmail.com"))
                {
                    //Show details
                }
                    else
                    {
                        mGoogleSignInClient.signOut();
                        Toast.makeText(MainActivity.this,"Login with gmail account only",Toast.LENGTH_SHORT).show();
                        //Show sign in button again
                    }
            }
        }
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        //Connection failed
    }
}

Answer 1

您的 mAuth 为空，因为它是在您使用它进行处理后定义的。

mAuth = FirebaseAuth.getInstance(); 行应该在该条件之前。

按如下操作:

    mAuth = FirebaseAuth.getInstance();

    if(mAuth.getCurrentUser() != null) {
        silentLogin();
    }

它肯定会起作用。

编辑:

我在我的项目中做了什么:

 final GoogleSignInAccount account = GoogleSignIn.getLastSignedInAccount(MyActivity.this);

 if (account != null) {
    gotoNextActivity();
 } else {
    signInButton.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            signIn();
        }
    });
 }