使用PHP curl的Gmail API访问令牌

Question

Facing issue while retrieving token for API call. Here is my code

$authUrl = "https://accounts.google.com/o/oauth2/token";

$curl = curl_init();

curl_setopt($curl, CURLOPT_URL, $authUrl);
curl_setopt($curl, CURLOPT_POST, TRUE);
curl_setopt($curl, CURLOPT_RETURNTRANSFER, TRUE);
curl_setopt($curl, CURLOPT_SSL_VERIFYPEER, false);
curl_setopt($curl, CURLOPT_POSTFIELDS, array(
    'code' => $code,
    'client_id' => CLIENT_ID,
    'client_secret' => CLIENT_SECRET,
    'redirect_uri' => $redirectURL,
    'grant_type' => 'authorization_code'
));

$http_data = curl_exec($curl);  
curl_close($curl);

var_dump($http_data);

$http_data is saying invalid request.

My task is to get all emails in my gmail account and I think for that I need access token. Please advise.

Thanx in Advance.

Answer 1

First you appear to be adding all of the parameters as part of the HTTP GET string this is a HTTP POST call. Also you appear to have forgotten to include the code you got from the first part of the auth flow.

That is the Authentication Code, it is used to request a refresh token. It is displayed to the user in the body of the html as well as in the title of the page. To get a Refresh Token you POST the Authentication code back to Google. Note: This is a HTTP Post you cant just place it in a browser that would be a HTTP Get. Note: grant_type=authorization_code

https://accounts.google.com/o/oauth2/token
code={Your code from the first part of flow}&client_id={ClientId}.apps.googleusercontent.com&client_secret={ClientSecret}&redirect_uri=urn:ietf:wg:oauth:2.0:oob&grant_type=authorization_code

Note have you considered using the Google APIs PHP Client library which will handle all of this for you?

Code ripped from my Google 3 legged Oauth2 flow article.