Save images from data: url in an html submission

gistfile1.aw

function save_images($object_id, $string) {
	// This part could probably be better
	$types = array(
			'image/jpeg' => 'jpg',
			'image/png'  => 'png',
			'image/gif'  => 'gif',
		);
	$DOM = new DOMDocument;
	$DOM->loadHTML($string);
	// Find all the img tags
	$items = $DOM->getElementsByTagName('img');
	for ($i = 0; $i < $items->length; $i++) {
		$src = $items->item($i)->getAttribute('src');
		// Only the ones with data: urls
		if (preg_match('/^data:/',$src)) {
			// Deconstruct it, get all the parts
			$semicolon_place = strpos($src, ';');
			$comma_place = strpos($src, ',');
			$type = substr($src,5,$semicolon_place-5);
			$base64_data = substr($src, $comma_place+1);
			$data = base64_decode($base64_data);
			$md5 = md5($data);
			$path = "/full/path/to/object/$object_id"
			if (!file_exists($path)) {
				mkdir($path, 0775);
			}
			$path .= "/{$md5}.{$types[$type]}";
			if (!file_exists($path)) {
				$handle = fopen($path,'w');
				fwrite($handle, $data);
				fclose($handle);
			}
			$items->item($i)->setAttribute('src', "/web/path/to/{$object_id}/{$md5}.{$types[$type]}");
		}
	}
	$string = $DOM->saveHTML();
	return $string;
}

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