Retrieve GameJolt user credentials from Unity for WebPlayer and WebGL builds (and simulate in the Editor)

GetUserFromWeb.cs

using UnityEngine;
using System.Collections;

public class GetUserFromWeb : MonoBehaviour
{

	// Set those up in the inspector if you want to simulate the GetFromWeb behaviour in within the Editor.
	public string debugUser;
	public string debugToken;
	
	void Awake()
	{
		GetFromWeb();
	}

	// Ask the webpage for the credentials.
	void GetFromWeb()
	{
#if UNITY_EDITOR
		if (!string.IsNullOrEmpty(debugUser) && !string.IsNullOrEmpty(debugToken))
		{
			OnGetFromWeb(string.Format("{0}:{1}", debugUser, debugToken));
		}
#elif UNITY_WEBPLAYER
		Application.ExternalCall ("GJAPI_AuthUser", gameObject.name, "OnGetFromWeb");
#elif UNITY_WEBGL
		Application.ExternalEval(string.Format(@"
var qs = location.search;
var params = {{}};
var tokens;
var re = /[?&]?([^=]+)=([^&]*)/g;

while (tokens = re.exec(qs)) {{
	params[decodeURIComponent(tokens[1])] = decodeURIComponent(tokens[2]);
}}

var message;
if ('gjapi_username' in params && params.gjapi_username !== '' && 'gjapi_token' in params && params.gjapi_token !== '') {{
	message = params.gjapi_username + ':' + params.gjapi_token;	
}}
else {{
	message = '';
}}

SendMessage('{0}', 'OnGetUserFromWeb', message);
		", gameObject.name));
#else
		Debug.Log("GJAPIHelper: The method \"GetFromWeb\" can only be called from WebPlayer or WebGL builds.");
#endif
	}

	// Read the webpage response.
	public void OnGetFromWeb(string response)
	{
		if (response != string.Empty)
		{
			var credentials = response.Split(new char[] { ':' }, 2);
			Debug.Log(string.Format("User: {0} - Token: {1}", credentials[0], credentials[1]));
		}
		else
		{
			Debug.Log("User: Guest");
		}
	}
}