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Hi,

I have about 50 lines of a file which i need converted, i am willing to pay for this too, Half of it has already been converted but my programmer is a php specialist and isn't too sure about it, so i need someone to convert the rest and verify the half that my programmer converted is correct, its a quick job and i will pay too. There are 5 functions that need to be converted.

The original .net file is below and my programmers attempt at converted it is below that, please take a look at provide a price for this.

.NET FILE:

To create the encryption variable, use the following algorithm: 
//compute a signature as the url compatible base64 encoded hmac-sha1.
//input the complete absolute url sans &s=, something like

// -- CoNVERT THE FUNCTIONS BELOW TO PHP --

public class UrlSigner
{
private readonly HMAC hmac;
private readonly string signatureParam;

public UrlSigner(string secret) : this(secret, "x") {}

private UrlSigner(string secret, string name)
{
this.hmac = new HMACSHA1(GetBytes(secret));
this.signatureParam = string.Format("{0}=", name);
}

public string Sign(string url)
{
var urlToSign = UrlToSign(url);
var bytes = GetBytes(urlToSign);
var signature = hmac.ComputeHash(bytes, 0, bytes.Length);
return string.Format("{0}{1}{2}", urlToSign, signatureParam, Base64ForUrl(signature));
}

public bool Verify(string url)
{
var npos = url.LastIndexOf(signatureParam);
if(npos == -1)
return false;
return Sign(url.Substring(0, npos)) == url;

}

string UrlToSign(string url)
{
if(!url.Contains('?'))
return url + '?';
if(url.EndsWith("?") || url.EndsWith("&"))
return url;
return url + "&";
}

byte[] GetBytes(string s){ return Encoding.UTF8.GetBytes(s); } 

string Base64ForUrl(byte[] bytes)
{
return Convert.ToBase64String(bytes)
.Replace('+', '-')
.Replace('/', '_')
.Replace("=", string.Empty);
}
}

Code (markup):

.PHP Partially converted File:

<?php
    class Federated {

        public static $signatureParam = null;

        /* This is the constructor function i figured it must run before anything else
        public UrlSigner(string secret) : this(secret, "x") {}

        private UrlSigner(string secret, string name)
        {
            this.hmac = new HMACSHA1(GetBytes(secret));
            this.signatureParam = string.Format("{0}=", name);
        }
        */
        public static function init($secret,$name)
        {
            //this.hmac = new HMACSHA1(GetBytes(secret)); i donno about this line, does we have anything equalient in php?
            self::$signatureParam = $name.'='; // not sure about this one either
        }

        // Sign
        //public string Sign(string url)
        //{
        //     var urlToSign = UrlToSign(url);
        //     var bytes = GetBytes(urlToSign);
        //     var signature = hmac.ComputeHash(bytes, 0, bytes.Length);
        //     return string.Format("{0}{1}{2}", urlToSign, signatureParam, Base64ForUrl(signature));
        //}
        public static function sign($url)
        {
            $urlToSign = self::url_to_sign($url);
            $bytes = self::get_bytes($urlToSign);
            $signature = sha1($bytes); // i dont think this is right, the "secret" must be in it somehow, maybe "$bytes . $secret" ? i really dont know
            return $urlToSign.self::$signatureParam.self::base64_for_url($signature); // not sure if this is right either.
        }


        // Verify
        // public bool Verify(string url)
        // {
        //     var npos = url.LastIndexOf(signatureParam);
        //
        //    if(npos == -1)
        //        return false;
        //
        //    return Sign(url.Substring(0, npos)) == url;
        // }
        public static function verify($url)
        {
            $npos = lastIndexOf(self::$signatureParam);

            if($npos == -1)
            {
                return false;
            }

            return
            // i dont really get this one tbh
        }



        // Prepare url for parameters, URL must end with ? or &
        // string UrlToSign(string url)
        // {
        //     if(!url.Contains('?'))
        //     return url + '?';
        //
        //     if(url.EndsWith("?") || url.EndsWith("&"))
        //     return url;
        //
        //    return url + "&";
        // }
        public static function url_to_sign($url)
        {
            if(strpos($url,'?')===false)
            {
                return $url . '?';
            }

            if(substr($url, -1) == '?' OR substr($url, -1) == '&')
            {
                return $url;
            }

            return $url . '&';
        }

        // donno about this one, it looks like this is what its doing but what the hell do i know?
        // byte[] GetBytes(string s){ return Encoding.UTF8.GetBytes(s); }
        public static function get_bytes($str)
        {
            return utf8_encode($str)
        }

        // Prepare string for use in URL (a little unsure about the replacement of = sign though, but seems like this is it)
        // string Base64ForUrl(byte[] bytes)
        // {
        //    return Convert.ToBase64String(bytes).Replace('+', '-').Replace('/', '_').Replace("=", string.Empty);
        // }
        public static function base64_for_url($string)
        {
            $string = base64_encode($string);
            // replace + with -
            $string = str_replace('+'.'-',$string);
            // replace / with _
            $string = str_replace('/'.'_',$string);
            // replace = with nothing
            $string = str_replace('='.'',$string);

            // Return an URL compatible string:
            return $string;
        }

    }

    // php don't have lastIndexOf function so made one:
    function lastIndexOf($string,$item)
    {
        $index=strpos(strrev($string),strrev($item));
        if ($index){
            $index=strlen($string)-strlen($item)-$index;
            return $index;
        }
            else
            return -1;
    }
?>

Code (markup):

Any Help with this is appreciated.

Thank you

 

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