POST using CURL in PHP gives invalid request Error

Question

I am using below post method for google account using curl but it gives me invalid_request error.

POST /o/oauth2/token HTTP/1.1
Host: accounts.google.com
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Answer 1

I was also having the same problem, where google returns an "invalid_xxx".

After much researching and troubleshooting, the problem lies with the encoding of the form itself! Do not use function 'http_builder_query', as it messses up the string and google cannot 'recognise' it. Example :

http_builder_query Output : "code=4%252FYYUT71KJ6..."

compared to

just a normal string : "code=4/YYUT71KJ6..."

Here is my working code, where i have placed 'x' in the locations that needs your own data (taken and modified from google oauth authentication)

    $code_from_user_login = "4/YYUT71KJ6....";
    $ch = curl_init();

        curl_setopt($ch, CURLOPT_URL, "https://accounts.google.com/o/oauth2/token");
        curl_setopt($ch, CURLOPT_POST, TRUE);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);


        $post_params = "code=" . $code_from_user_login . "&";
        $post_params .= "redirect_uri=http://www.x.com/&";
        $post_params .= "client_id=x.apps.googleusercontent.com&";
        $post_params .= "client_secret=x&";
        $post_params .= "grant_type=authorization_code&";


        curl_setopt($ch, CURLOPT_POSTFIELDS, $post_params);
        $result = curl_exec($ch);
        print($result);

The result will be like :

  '{
  "access_token" : "ya29.AHES6ZSwJSHpTZ1t....",
  "token_type" : "Bearer",
  "expires_in" : 3599,
  "id_token" : "eyJhbGciOiJSUzI1NiIsImtpZCI6IjU0MDQxOTZlMmQzOGNjYTA2MW...."
}'

Once you have the 'access_token', access the profile data with this url : https://www.googleapis.com/oauth2/v1/userinfo?access_token=YOUR_ACCESS_TOKEN_HERE

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