emails from gmail but response is gmail.readonly - gmail-api

Question

I am trying to get the emails from gmail using https://www.googleapis.com/auth/gmail.readonly/?access_token='fdrt654vfdgfe6545But in response I am getting gmail.readonlyBut the System.HttpResponse[Status=OK, StatusCode=200] is fine. Can any guide me is there anything I am missing out.
This I how I requested got auth but in the response I received access token
<script type="text/javascript">
(function() {
var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
po.src = 'https://apis.google.com/js/client:plusone.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
})();
</script>
<script type="text/javascript">
(function() {
var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
po.src = 'https://apis.google.com/js/client:plusone.js';
var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
})();
var AuthStates = {google: null};
function signinCallback(authResult) {
if (authResult['status']['signed_in']) {
// Update the app to reflect a signed in user
// Hide the sign-in button now that the user is authorized, for example:
document.getElementById('signinButton').setAttribute('style', 'display: none');
//alert(authResult['code']);
console.log('code state: ' + authResult['code']);
//console.log('authResult : ' + authResult[]);
AuthStates.google = authResult;
console.log('authResult 1 : ' + authResult['status']['method']);
console.log('auth Result : ' + authResult['id_token']);
//{!access_token} = authResult['access_token'];
//{!code} = authResult['code'];
connection(authResult['access_token'], authResult['code']);
} else {
// Update the app to reflect a signed out user
// Possible error values:
// "user_signed_out" - User is signed-out
// "access_denied" - User denied access to your app
// "immediate_failed" - Could not automatically log in the user
console.log('Sign-in state: ' + authResult['error']);
}
}
</script>
<apex:outputPanel >
<span id="signinButton">
<span
class="g-signin"
data-callback="signinCallback"
data-clientid="clientid"
data-cookiepolicy="single_host_origin"
data-scope="https://www.googleapis.com/auth/gmail.readonly"
data-response_type="code"
data-redirect_uri="http://test-on.ap1.visual.force.com/apex/Gmail_inbox">
</span>
</span>
<apex:form >
So as i got my access token from my request I can go directly for getting all information related to the logedin user. As I am getting all the information regarding the user I am trying to get all the emails related to him. Is I am doing right or I am wrong any place. I am very new with api and web service trying to learn. please do help me put out.

Answer 1

You're actually making an HTTP GET call to that URL ( https://www.googleapis.com/auth/gmail.readonly/?access_token= ...)? Isn't that just the auth scope identifier?
Once you have a valid Oauth2 token you can set in the Auth header then you can make HTTP requests to the API. For example, to list messages see:
https://developers.google.com/gmail/api/v1/reference/users/messages/list
That has the URL to access (GET https://www.googleapis.com/gmail/v1/users/me/messages ) then once you have the message IDs you can get the messages individually following: https://developers.google.com/gmail/api/v1/reference/users/messages/get (e.g. GET https://www.googleapis.com/gmail/v1/users/me/messages/ ).
Usually there are good client libraries for the Google APIs. Not sure if that works for you, but see, for example:
https://developers.google.com/gmail/api/downloads