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Christian Sciberras

Joined: 11 Jan 2008
Posts: 8
Location: Malta

Posted: Thu Apr 10, 2008 9:13 pm Post subject: Converting urls/fields

Hello all!

I'm having some trouble with some php code.

My objective is having alot of html code in a string and making php change relative paths to absolute paths (the "extra" part of the absolute path is in a string).

Here's some pseudo code:

Code:

$code="<a href='http://example.com'><img src='img/img1.png'></a>";
$abs="http://test.com/";
process($src,$abs); // this is a custom function which does all the hard work (and is what I need to create!)
echo $src; // should read as:
// <a href='http://example.com'><img src='http://test.com/img/img1.png'></a>

The replacement/concatenating needs to be done for both src and href attributes and only when the url they point to is relative.

Thanks for reading this!

Kind regards,
Christian

Edit:
I tried this with str_ireplace() but there are several serious flaws:
'href="' could be written as 'href ="' or with more spaces

yancho
Site Admin

Joined: 13 Nov 2007
Posts: 56
Location: Iklin

Posted: Mon Apr 14, 2008 8:50 am Post subject:




 So you want that your function replaces the href and src right? why not make process() output an array and :



php:


$code='<a href="http://exa.com"><img src="img/img1.png"></a>'; 

$abs="http://tes.com/"; 

$result = process($code,$abs); 

$str =  '<a href="'.$result[0].'"><img src="'.$result[1].'"></a>';

echo $str;



function process($code, $abs) {

 $res = array ();

 $res[0] = $code;

 $pos = stripos($abs, 'http://'); 

 if ($pos == false) { //meaning it is an absolute path

   $newstring = '<img src="'.$abs;

   $res[1] = str_ireplace('<img src="/img/"',$newstring, $code);

 }

 else { $res[1] = $abs; }

 return $res;

}  





Hope it helps

_________________

Christian Sciberras

Joined: 11 Jan 2008
Posts: 8
Location: Malta

Posted: Thu Apr 17, 2008 8:14 pm Post subject:




 Thanks yancho, but I tackled it differently. I'm using PEAR/POSIX regex.

Here's my code:

php:
// removes first slash

function rem_slash($txt){

    if($txt{0}=='/'){

        $txt{0}='';

    }

    return $txt;

}

// make all action/href/src links pass through the proxy

function format($html,$ul){

    $new='index.php?url=';

    $ptcl=array('http:','https:','ftps:','ftp:','file:','mailto:','www.');

    preg_match_all('/((action|href|src)+=[\'|"])([^\'"]+[^\'"]*)[\'|"]/i', $html, $out, PREG_SET_ORDER);

    foreach ($out as $val) {

        // val[0]="href='covac-software.com'" val[1]="href='" val[3]="covac-software.com"

        $res=false;

        foreach ($ptcl as $sr){ if(!(stripos($val[3],$sr)===false)){ $res=true; } }

        if($res){$html=str_replace($val[1].$val[3],$val[1].$new.rem_slash($val[3]),$html);}

            else{$html=str_replace($val[1].$val[3],$val[1].$new.$ul.rem_slash($val[3]),$html);}

    }

    return $html;

}

// make sure it's a directory or domain

function dirfy($u){

    if(strpos($u,':')===false){$u='http://'.$u.'/';}

    $u=parse_url($u);

    $p=pathinfo($u['path'],PATHINFO_DIRNAME);

    if($p!='\\'){

        return $u['scheme'].'://'.$u['host'].$p.'/';

    }else{

        return $u['scheme'].'://'.$u['host'].'/';

    }

}

?>

And it is used as follows:php:
<?

$oldcode="<a href='somewhere.com'>re</a><img src='/imgs/img.png'><img src='http://test.com/imgs/img.png'>";

$newcode=format($oldcode,dirfy($url));
This code will be the base code in a php proxy server project I'm working on called UPPS. (http://www.covac-software.com/proxy/).

The proxy is a solution to annoying school filters. I'm thinking in giving out the php source maybe. 

The special thing about it is that it includes a whole admin control panel and doesn't use local files,

so it can only lose bandwidth and not disk space.

Regards,

Christian

yancho
Site Admin

Joined: 13 Nov 2007
Posts: 56
Location: Iklin

Posted: Mon Apr 21, 2008 6:22 pm Post subject:

Glad u got it fixed Smile

Tried to keep things easy for u there heh Smile

Remember that Regexp are far slower than normal (hard to play with) PHP functions - but I dont guess its an issue here.

Gluck!
_________________

Christian Sciberras

Joined: 11 Jan 2008
Posts: 8
Location: Malta

Posted: Wed Apr 23, 2008 3:43 pm Post subject:

I guessed Regex would be slowwer. Well PHP is very fast, so it should got unnoticed. But, when perfecting the proxy, I think it would be better to create a custom function.
Thanks,
Christian

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