invalid_grant Google OAuth - google-maps-api-3

Question

I am trying to authentiate through Google's OAuth, but I'm having problems establishing a connection to their API
My client code:
'click #addChannel': function (event) {
event.preventDefault();
var userId = Meteor.userId();
var options = {
requestPermissions: [
'https://www.googleapis.com/auth/youtube',
'https://www.googleapis.com/auth/userinfo.email',
'https://www.googleapis.com/auth/youtube.force-ssl',
'https://www.googleapis.com/auth/youtube.readonly',
'https://www.googleapis.com/auth/youtube.upload',
'https://www.googleapis.com/auth/youtubepartner',
'https://www.googleapis.com/auth/youtubepartner-channel-audit',
],
requestOfflineToken: true
};
Google.requestCredential(options, function(token) {
Meteor.call('userAddOauthCredentials', userId, token, function(error, result) {
if (error) {
throw error;
}
console.log(result);
});
});
My server code:
userAddOauthCredentials: function(userId, token) {
check(userId, String);
check(token, String);
var config = ServiceConfiguration.configurations.findOne({service: 'google'});
if (!config) {
throw new ServiceConfiguration.ConfigError();
}
console.log(token, config);
var endpoint = 'https://accounts.google.com/o/oauth2/token';
var params = {
code: token,
client_id: config.clientId,
client_secret: OAuth.openSecret(config.secret),
redirect_uri: OAuth._redirectUri('google', config),
grant_type: 'authorization_code',
};
try { <------------------------------------------------------ this fails
response = HTTP.post(endpoint, { params: params });
} catch (err) {
throw _.extend(new Error("(first) Failed to complete OAuth handshake with Google. " + err.message),
{response: err.response});
}
if (response.data.error) { // if the http response was a json object with an error attribute
throw new Error("(second) Failed to complete OAuth handshake with Google. " + response.data);
} else {
return {
accessToken: response.data.access_token,
refreshToken: response.data.refresh_token,
expiresIn: response.data.expires_in,
idToken: response.data.id_token
};
}
The above throws a [400] { "error" : "invalid_grant" } error.
Most of the above code I got from how the meteor accounts-google packages logs in a user (which works fine in my application). Link to that:
https://github.com/meteor/meteor/blob/87e3c6499d5eacce62f10faefe9ce49c77bb03ee/packages/google/google_server.js
Any advice on how to proceed from here?
Much appreciated
UPDATE1:
I get these warnings in my log
W20150318-09:11:42.532(1) (oauth_server.js:71) Unable to base64 decode state from OAuth query: undefined
W20150318-09:11:42.532(1) (oauth_server.js:71) Unable to base64 decode state from OAuth query: undefined
W20150318-09:11:42.533(1) (oauth_server.js:71) Unable to base64 decode state from OAuth query: undefined
W20150318-09:11:42.534(1) (oauth_server.js:398) Error in OAuth Server: Match error: Expected string, got undefined

Answer 1

You have to parse your var params to application/x-www-form-urlencoded. Please find the below code to parse as i done in php
$fields_string="";
foreach($params as $key=>$value)
{
$fields_string .= $key.'='.$value.'&';
}
rtrim($fields_string, '&');
Now the $filed_string will contained the parse of params array.