Data URL Praser

dataurl.php

<?php
	# Demo: http://mt.aa.am/dataurl.php
	
	# data:[<MIME-type>][;charset=<encoding>][;base64],<data>
	if(isset($_GET['uri']) || isset($_POST['uri']) || isset($_GET['file'])) {
		if(isset($_GET['uri'])) $uri = $_GET['uri'];
		else if(isset($_POST['uri'])) $uri = $_POST['uri'];
		else if(isset($_GET['file'])) {
			$file = $_GET['file'];
			if(!(strtolower(substr($file, 0, 7)) == "http://" || strtolower(substr($file, 0, 8)) == "https://"))
				if(realpath("dataurl/$file") != realpath("dataurl") . "/" . $file) die(header("HTTP/ 403"));
			$uri = file_get_contents($_GET['file']);
		}
		
		$mime = "text/plain";
		$charset = "";
		$base64 = false;
		
		$exp = explode(",", $uri, 2);
		$head = explode(";", $exp[0]);
		$data = $exp[1];
		
		foreach($head as $v) {
			if(strtolower(substr($v, 0, 5)) == "data:") $v = substr($v, 5);
			if(strtolower(substr($v, 0, 8)) == "charset=") $charset = ";$v";
			else if(strtolower($v) == "base64") $base64 = true;
			else $mime = $v;
		}
		
		header("Content-type: $mime$charset");
		if($base64) echo(base64_decode($data));
		else echo(urldecode($data));
	} else {
?>
<form method="post">
	<input name="uri" />
	<input type="submit" />
</form>
<?php
	}
?>