NodeJS Facebook User Feed Subscriptions: Invalid OAuth access token - node.js

Question

Am close to tearing my hair out (as a passionate developer, should), so hopefully I can get some help on this one. After reading a bunch of forums and sifting through facebook documentation, here is a log file of trying to make a subscription to user feed's. I really only need to know if the bottom set of API's I am running should work in theory. Here is my log:
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makeRequest - Host: graph.facebook.com - Path: /v2.2/{ app_id }/subscriptions?object=user
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Type: DELETE
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Wed Feb 25 2015 12:52:15 GMT+0000 (UTC) Server is listening on port 81
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makeRequest - Host: graph.facebook.com - Path: /oauth/access_token?client_id={ app_id }&client_secret={ app_secret }&grant_type=client_credentials
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Type: GET
*********************************************************
App Access Token: { app_token }
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makeRequest - Host: graph.facebook.com - Path: /v2.2/{ app_id }/subscriptions?&object=user&fields=feed&callback_url={ uri_encoded_ callback_url }&verify_token={ verify_token }&access_token={ app_token }
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Type: POST
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Success: {"error":{"message":"Invalid OAuth access token.","type":"OAuthException","code":190}}
So here I am first trying to delete any subscriptions currently active, then using the API to get issued a new application access token, and finally to make a new subscription. Here is my function to initialize this whole process:
function subscribe_facebook(http,https) {
var oauth_obj = getOauthObj('facebook');
// First Delete
var url = oauth_obj.subscription_url;
var host = splitUrl(url,"host");
var path = splitUrl(url,"path");
path += "?object=user";
makeRequest(http,host,path,80,'DELETE',function(ret){
// Get App Access Token
url = oauth_obj.access_token_url;
host = splitUrl(url,"host");
path = splitUrl(url,"path");
path += "?client_id=" + oauth_obj.app_id;
path += "&client_secret=" + oauth_obj.app_secret;
path += "&grant_type=client_credentials";
makeRequest(https,host,path,443,'GET',function(ret){
facebook_app_token = ret.toString().split('|');
facebook_app_token = facebook_app_token[1];
consoleLogger("App Access Token: " + facebook_app_token);
subscribe(https,'facebook',443,'POST',facebook_app_token,myServer);
});
});
}
And here is the subscribe function it enters:
function subscribe(http,type,port,method,access_token,myServer) {
var oauth_obj = getOauthObj(type);
var sub_post_data = "";
switch (type) {
case "facebook":
sub_post_data =
"&object=" + "user"+
"&fields=" + "feed"+
"&callback_url=" + encodeURIComponent(myServer + "/" + type) +
"&verify_token=" + "*****" +
"&access_token=" + access_token
break;
}
var host = splitUrl(oauth_obj.subscription_url,"host");
var path = splitUrl(oauth_obj.subscription_url,"path");
path += "?" + sub_post_data;
makeRequest(http,host,path,port,method,function(ret) {
consoleLogger("Success: " + ret);
});
}
I made this other function to maintain the social media variables:
function getOauthObj(type) {
var obj = {};
var authorize_url = "";
var access_token_url = "";
var request_token_url = "";
var subscription_url = "";
var app_id = "";
var app_secret = "";
var main_domain = "";
var scope = "";
switch (type) {
case "facebook":
app_id = '*****';
app_secret = '**********';
main_domain = 'https://graph.facebook.com/';
authorize_url = 'https://www.facebook.com/dialog/oauth';
access_token_url = main_domain + 'oauth/access_token';
request_token_url = main_domain + '2.2/me';
subscription_url = main_domain + "v2.2/" + app_id + "/subscriptions";
scope = 'read_stream';
break;
}
obj.main_domain = main_domain;
obj.authorize_url = authorize_url;
obj.access_token_url = access_token_url;
obj.request_token_url = request_token_url;
obj.subscription_url = subscription_url;
obj.app_id = app_id;
obj.app_secret = app_secret;
return obj;
}
Being that the OAuth is invalid, I'm assuming that I'm not passing the right parameters to the oauth API to do this or not - can someone steer me in the right direction?

Answer 1

Ok, well it's fixed now. I have read on some forums about different Facebook API's which details that using the application id, concatenated with a pipe, then the application secret can be used in place of an access token, but I didn't think this could be used here, but turns out it can!
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makeRequest - Host: graph.facebook.com - Path: /v2.2/{ app_id }/subscriptions?&object=user&fields=feed&callback_url={ callback_url }&verify_token={ verify_token }&access_token={ app_id }|{ app_secret }
Hopefully this helps someone.
Cheers.