Tweeter for Unity

Tweeter.cs

/*******************************************************************
 * Tweeter for Unity
 * by Deozaan
 * Description and instructions: https://tweeter.deozaan.com/
 * URL: https://gist.github.com/Deozaan/87e90c6679240f81743f
 * Questions or Feedback? http://twitter.com/Deozaan
 *******************************************************************/

using System.Collections;
using System.Security.Cryptography;
using UnityEngine;
using UnityEngine.Networking;

public class Tweeter : MonoBehaviour {
	[SerializeField]
	private string accessTokenSecret = ""; // LEAVE THIS BLANK IN PRODUCTION!	
	private static string tweeterURL = "URL_PATH_HERE" + "tweeter.php?status=";
	public bool tweetInEditor = false;

	void Start() {
		DontDestroyOnLoad(gameObject);
		if (string.IsNullOrEmpty(accessTokenSecret)) {
			Debug.LogError("No access token assigned. Things won't work.");
		}

		if (tweeterURL == "URL_PATH_HEREtweeter.php?status=") {
			Debug.LogError("You forgot to change the tweeter URL. Things won't work.");
		}
	}

	/// <summary>Sends a tweet.</summary>
	/// <param name="tweet">The tweet/status message.</param>
	public static void Send(string tweet) {
		if (Application.isEditor && !Instance.tweetInEditor) { return; }
		if (!string.IsNullOrEmpty(Instance.accessTokenSecret)) {
			Instance.StartCoroutine(Instance.SendTweetCoroutine(tweet));
		}
	}

	private IEnumerator SendTweetCoroutine(string tweet) {
		string signature = CreateSignature(tweet);
		string fullURL = tweeterURL + UnityWebRequest.EscapeURL(tweet) + "&hash=" + UnityWebRequest.EscapeURL(signature);
		//Debug.Log(fullURL);
		var w = UnityWebRequest.Get(fullURL);
		w.SendWebRequest();
		yield return w;
		if (!string.IsNullOrEmpty(w.error)) {
			Debug.LogWarning("Tweet failed: " + w.error);
		} else {
			if (w.downloadHandler.text.StartsWith("{\"errors\"")) {
				Debug.LogWarning("Tweet failed: " + w.downloadHandler.text);
			} else {
#if UNITY_EDITOR
				Debug.Log("Tweet Succeeded? " + w.downloadHandler.text);
#endif
			}
		}
	}

	private byte[] String2Bytes(string myString) {
		return System.Text.Encoding.UTF8.GetBytes(myString);
	}

	private string CreateSignature(string signMe) {
		return CreateSignature(signMe, accessTokenSecret);
	}

	private string CreateSignature(string signMe, string token) {
		//Debug.Log("Hashing the following text: \n" + signMe);
		HMACSHA1 signature = new HMACSHA1(String2Bytes(token));
		byte[] hash = signature.ComputeHash(String2Bytes(signMe));
		return System.Convert.ToBase64String(hash);
	}

	#region Singleton Behavior
	private static Tweeter _mInstance;
	public static Tweeter Instance {
		get {
			if (!_mInstance) {
				Tweeter[] managers = GameObject.FindObjectsOfType(typeof(Tweeter)) as Tweeter[];
				if (managers.Length != 0) {
					if (managers.Length == 1) {
						_mInstance = managers[0];
						_mInstance.gameObject.name = typeof(Tweeter).Name;
						return _mInstance;
					} else {
						Debug.LogError("You have more than one Tweeter in the scene. You only need 1, it's a singleton!");
						// delete all instances, saving only one (if any) if it has the secret
						bool secretFound = false;
						for (int i = 0; i < managers.Length; i++) {
							if (secretFound || string.IsNullOrEmpty(managers[i].accessTokenSecret)) {
								// and instance with the secret already exists or the secret is null/empty
								Destroy(managers[i].gameObject);
							} else {
								// this is the first one we've found that has a non-null/empty secret. Keep it!
								secretFound = true;
							}
						}
					}
				} else {
					Debug.LogWarning("There were no Tweeters in the scene. Creating one with default accessToken.\n" +
						"If default token is blank (as it should be) then tweeting won't work.");
					GameObject gO = new GameObject(typeof(Tweeter).Name, typeof(Tweeter));
					_mInstance = gO.GetComponent<Tweeter>();
					DontDestroyOnLoad(gO);
				}
			}

			return _mInstance;
		}
		set {
			_mInstance = value as Tweeter;
		}
	}
	#endregion
}

public static class TweeterExtensions {
	/// <summary>Truncates a string if it is longer than length.
	/// This also removes the @ symbol at the beginning of the string since truncation will break twitter username link.</summary>
	/// <param name="length">The max length of the string before truncation occurs.</param>
	public static string Truncate(this string mString, int length) {
		return (mString.Length > length) ?
				mString.RemoveAtSymbol().Substring(0, length) : // remove the @ sign since truncating the name will break link to Twitter username
				mString; // name is <= length so no changes necessary
	}

	/// <summary>Removes @ from the beginning of a string, if one is present</summary>
	public static string RemoveAtSymbol(this string mString) {
		return (mString.StartsWith("@")) ? mString.Substring(1) : mString;
	}

	/// <summary>Prefixes a string with a period if it would otherwise start with an @ symbol.
	/// This is useful to make messages show up in all feeds instead of being a pseudo-direct message.</summary>
	public static string PrefixPeriod(this string mString) {
		return (mString.StartsWith("@")) ? "." + mString : mString;
	}

	/// <summary>Gives the first name from a string where words are separated by a space.</summary>
	public static string GetFirstName(this string mString) {
		return mString.Split(' ')[0];
	}
}

tweeter.php

<?php

/** Set access tokens here - see: https://dev.twitter.com/apps/ **/
$settings = array(
	'oauth_access_token' => "ACCESS_TOKEN",
	'oauth_access_token_secret' => "ACCESS_TOKEN_SECRET",
	'consumer_key' => "CONSUMER_API_KEY", // API Key
	'consumer_secret' => "CONSUMER_API_SECRET" // API Secret
);

/** Set redirect (on failure) URL here **/
$redirecturl = 'URL_HERE';

// https://github.com/Deozaan/twitter-api-php
require_once('TwitterAPIExchange.php'); // make sure this url is correct

$url = 'https://api.twitter.com/1.1/statuses/update.json';
$requestMethod = 'POST';

$myStatus = html_entity_decode(htmlentities($_GET["status"], ENT_COMPAT, "UTF-8", false));
$myHash = htmlentities($_GET["hash"], ENT_COMPAT, "UTF-8", false);
$scaryStatus = $_GET["status"];

$postfields = array(
	'status' => $myStatus,
);

// make sure we have both a status and a hash
if (!empty($myStatus) && isset($myStatus) && !empty($myHash) && isset($myHash)) {
	// verify the hashes match	
	$newHash = base64_encode(hash_hmac('sha1', $myStatus, $settings['oauth_access_token_secret'], true));
	if ($newHash === $myHash) {
		// hashes match, so send the tweet!
		$twitter = new TwitterAPIExchange($settings);
		echo $twitter ->buildOAuth($url, $requestMethod)->setPostfields($postfields)->performRequest();
	} else {
		?>
<link rel="icon" type="image/png" href="icon.png">
Failed.
<script type="text/javascript">

<!--

window.location = "<?php echo $redirecturl ?>"

//-->

</script>
	<?php
	}
}
?>
<link rel="icon" type="image/png" href="icon.png">
<script type="text/javascript">

<!--

window.location = "<?php echo $redirecturl ?>"

//-->

</script>

TwitterAPIExchange.php

<?php

/**
 * Twitter-API-PHP : Simple PHP wrapper for the v1.1 API
 * 
 * PHP version 5.3.10
 * 
 * @category	Awesomeness
 * @package 	Twitter-API-PHP
 * @author		James Mallison <me@j7mbo.co.uk>
 * @license		MIT License
 * @link		http://github.com/j7mbo/twitter-api-php
 */
class TwitterAPIExchange
{
	private $oauth_access_token;
	private $oauth_access_token_secret;
	private $consumer_key;
	private $consumer_secret;
	private $postfields;
	private $getfield;
	protected $oauth;
	public $url;

	/**
	 * Create the API access object. Requires an array of settings::
	 * oauth access token, oauth access token secret, consumer key, consumer secret
	 * These are all available by creating your own application on dev.twitter.com
	 * Requires the cURL library
	 * 
	 * @param array $settings
	 */
	public function __construct(array $settings)
	{
		if (!in_array('curl', get_loaded_extensions())) 
		{
			throw new Exception('You need to install cURL, see: http://curl.haxx.se/docs/install.html');
		}
		
		if (!isset($settings['oauth_access_token'])
			|| !isset($settings['oauth_access_token_secret'])
			|| !isset($settings['consumer_key'])
			|| !isset($settings['consumer_secret']))
		{
			throw new Exception('Make sure you are passing in the correct parameters');
		}

		$this->oauth_access_token = $settings['oauth_access_token'];
		$this->oauth_access_token_secret = $settings['oauth_access_token_secret'];
		$this->consumer_key = $settings['consumer_key'];
		$this->consumer_secret = $settings['consumer_secret'];
	}
	
	/**
	 * Set postfields array, example: array('screen_name' => 'J7mbo')
	 * 
	 * @param array $array Array of parameters to send to API
	 * 
	 * @return TwitterAPIExchange Instance of self for method chaining
	 */
	public function setPostfields(array $array)
	{
		if (!is_null($this->getGetfield())) 
		{ 
			throw new Exception('You can only choose get OR post fields.'); 
		}
		
		if (isset($array['status']) && substr($array['status'], 0, 1) === '@')
		{
			$array['status'] = sprintf("\0%s", $array['status']);
		}
		
		$this->postfields = $array;
		
		return $this;
	}
	
	/**
	 * Set getfield string, example: '?screen_name=J7mbo'
	 * 
	 * @param string $string Get key and value pairs as string
	 * 
	 * @return \TwitterAPIExchange Instance of self for method chaining
	 */
	public function setGetfield($string)
	{
		if (!is_null($this->getPostfields())) 
		{ 
			throw new Exception('You can only choose get OR post fields.'); 
		}
		
		$search = array('#', ',', '+', ':');
		$replace = array('%23', '%2C', '%2B', '%3A');
		$string = str_replace($search, $replace, $string);  
		
		$this->getfield = $string;
		
		return $this;
	}
	
	/**
	 * Get getfield string (simple getter)
	 * 
	 * @return string $this->getfields
	 */
	public function getGetfield()
	{
		return $this->getfield;
	}
	
	/**
	 * Get postfields array (simple getter)
	 * 
	 * @return array $this->postfields
	 */
	public function getPostfields()
	{
		return $this->postfields;
	}
	
	/**
	 * Build the Oauth object using params set in construct and additionals
	 * passed to this method. For v1.1, see: https://dev.twitter.com/docs/api/1.1
	 * 
	 * @param string $url The API url to use. Example: https://api.twitter.com/1.1/search/tweets.json
	 * @param string $requestMethod Either POST or GET
	 * @return \TwitterAPIExchange Instance of self for method chaining
	 */
	public function buildOauth($url, $requestMethod)
	{
		if (!in_array(strtolower($requestMethod), array('post', 'get')))
		{
			throw new Exception('Request method must be either POST or GET');
		}
		
		$consumer_key = $this->consumer_key;
		$consumer_secret = $this->consumer_secret;
		$oauth_access_token = $this->oauth_access_token;
		$oauth_access_token_secret = $this->oauth_access_token_secret;
		
		$oauth = array( 
			'oauth_consumer_key' => $consumer_key,
			'oauth_nonce' => time(),
			'oauth_signature_method' => 'HMAC-SHA1',
			'oauth_token' => $oauth_access_token,
			'oauth_timestamp' => time(),
			'oauth_version' => '1.0'
		);
		
		$getfield = $this->getGetfield();
		
		if (!is_null($getfield))
		{
			$getfields = str_replace('?', '', explode('&', $getfield));
			foreach ($getfields as $g)
			{
				$split = explode('=', $g);
				$oauth[$split[0]] = $split[1];
			}
		}
		
		$base_info = $this->buildBaseString($url, $requestMethod, $oauth);
		$composite_key = rawurlencode($consumer_secret) . '&' . rawurlencode($oauth_access_token_secret);
		$oauth_signature = base64_encode(hash_hmac('sha1', $base_info, $composite_key, true));
		$oauth['oauth_signature'] = $oauth_signature;
		
		$this->url = $url;
		$this->oauth = $oauth;
		
		return $this;
	}
	
	/**
	 * Perform the actual data retrieval from the API
	 * 
	 * @param boolean $return If true, returns data.
	 * 
	 * @return string json If $return param is true, returns json data.
	 */
	public function performRequest($return = true)
	{
		if (!is_bool($return)) 
		{ 
			throw new Exception('performRequest parameter must be true or false'); 
		}
		
		$header = array($this->buildAuthorizationHeader($this->oauth), 'Expect:');
		
		$getfield = $this->getGetfield();
		$postfields = $this->getPostfields();

		$options = array( 
			CURLOPT_HTTPHEADER => $header,
			CURLOPT_HEADER => false,
			CURLOPT_URL => $this->url,
			CURLOPT_RETURNTRANSFER => true,
			CURLOPT_TIMEOUT => 10,
		);

		if (!is_null($postfields))
		{
			$options[CURLOPT_POSTFIELDS] = $postfields;
		}
		else
		{
			if ($getfield !== '')
			{
				$options[CURLOPT_URL] .= $getfield;
			}
		}

		$feed = curl_init();
		curl_setopt_array($feed, $options);
		$json = curl_exec($feed);
		curl_close($feed);

		if ($return) { return $json; }
	}
	
	/**
	 * Private method to generate the base string used by cURL
	 * 
	 * @param string $baseURI
	 * @param string $method
	 * @param array $params
	 * 
	 * @return string Built base string
	 */
	private function buildBaseString($baseURI, $method, $params) 
	{
		$return = array();
		ksort($params);
		
		foreach($params as $key=>$value)
		{
			$return[] = "$key=" . $value;
		}
		
		return $method . "&" . rawurlencode($baseURI) . '&' . rawurlencode(implode('&', $return)); 
	}
	
	/**
	 * Private method to generate authorization header used by cURL
	 * 
	 * @param array $oauth Array of oauth data generated by buildOauth()
	 * 
	 * @return string $return Header used by cURL for request
	 */	
	private function buildAuthorizationHeader($oauth) 
	{
		$return = 'Authorization: OAuth ';
		$values = array();
		
		foreach($oauth as $key => $value)
		{
			$values[] = "$key=\"" . rawurlencode($value) . "\"";
		}
		
		$return .= implode(', ', $values);
		return $return;
	}
}