How to create a parse _User account from a Android Google token?

Question

I\'ve found some fragments of useful information.

http://blog.parse.com/announcements/bring-your-own-login/ shows me how to login an Android app once I have

Answer 1

Steps:

1. Get the Google token
2. Send the Google token to your Parse back-end to validate
3. Use the validated Google token to create a Parse session token
4. Use the Parse session token to allow users to access the app

---

(1): See the guide: https://developers.google.com/identity/sign-in/android/sign-in

---

(2): Send the ID token to your back-end server (in this case Parse).

//sending the token to the backend
        String backendApiUrlToGenerateSessionToken = your_url_with_cloud_code_to_generate_session_token;
        Log.i("URL: ", backendApiUrlToGenerateSessionToken);

        RequestQueue newRequestQueue = Volley.newRequestQueue(this);

        JSONObject getSessionTokenJsonRequestBody = new JSONObject();
        //back-end requires the token and Google client ID to be verified
        try {
            getSessionTokenJsonRequestBody.put("idToken", idTokenFromGoogle);
            getSessionTokenJsonRequestBody.put("GClientId", your_google_client_id);     //find it in google-services.json file
        } catch (JSONException e) {
            e.printStackTrace();
        }

        final String requestBody = getSessionTokenJsonRequestBody.toString();

        JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.POST, backendApiUrlToGenerateSessionToken, getSessionTokenJsonRequestBody,
                new Response.Listener() {
                    @Override
                    public void onResponse(JSONObject response) {
                        //success callback
                        //set current user and continue
                        try {
                            ParseUser.becomeInBackground(response.getString("result"), new LogInCallback() {
                                @Override
                                public void done(ParseUser user, ParseException e) {
                                    if (user != null){
                                        //successfully logged in, take the user to the last page they were on
                                        finish();
                                    }else{
                                        //error
                                        Log.e("Login error: ", e.getMessage());
                                        //show error dialog, prompt user to login again

                                    }
                                }
                            });
                        } catch (JSONException e) {
                            e.printStackTrace();
                        }

                    }
                },
                new Response.ErrorListener() {
                    @Override
                    public void onErrorResponse(VolleyError error) {
                        //error callback
                        int  statusCode = error.networkResponse.statusCode;
                        NetworkResponse response = error.networkResponse;

                        Log.d("Error Response req: ","" + statusCode + " " + response.data.toString());

                    }
                })
        {
            @Override
            public Map getHeaders(){
                Map headers = new HashMap<>();
                //post parameters
                headers.put("X-Parse-Application-Id", getResources().getString(R.string.parse_app_id));
                headers.put("X-Parse-REST-API-Key", getResources().getString(R.string.parse_rest_api_key));
                headers.put("Content-Type", "application/json");
                return headers;
            }

            @Override
            public byte[] getBody(){
                try {
                    String body;
                    if (requestBody == null) body = null;
                    else body = String.valueOf(requestBody.getBytes("utf-8"));
                    return requestBody == null ? null : requestBody.getBytes("utf-8");
                } catch (UnsupportedEncodingException e) {
                    e.printStackTrace();
                    return null;
                }
            }
        };
        newRequestQueue.add(jsonObjectRequest);

---

(3): We've sent the token to our back-end, now we need to validate the token and generate our Parse session token in our back-end. Credit to @Amit http://pastebin.com/133LVYbm included logic to handle logged out users and subsequent login from the same Google account

//generating a random password
function getRandomString(){
    var chars = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXTZ";
    var string_length = 10;
    var randomstring = '';

    for (var i=0; i

---

(4) Logic is in step (2) when the requestQueue returns the response we call the becomenbackground() method which saves the session and allows us to get the currently logged in user