svg-to-png.php

<?php
$settings = [];

// svg file
if (isset($_GET['svg'])) {
	// general/custom svg file
	$svgFile = DIR_ASSETS.'/cdn/dist/svg/'.$_GET['svg'];
	if (!preg_match('~^\w[\w/-]+\.svg$~', $_GET['svg']) || !file_exists($svgFile)) die('Invalid svg');
} elseif (isset($_GET['fa'])) {
	// fontawesome icon
	$types = [
		'b' => 'brands',
		'd' => 'duotone',
		'l' => 'light',
		'r' => 'regular',
		's' => 'solid'
	];
	$type = $types['s'];
	if (isset($_GET['type']) && isset($types[$_GET['type'][0]])) $type = $types[$_GET['type'][0]];
	$svgFile = DIR_ASSETS.'/cdn/dist/svg/fontawesome/'.$type.'/'.$_GET['fa'].'.svg';
	if (!preg_match('~^[\w-]+$~', $_GET['fa']) || !file_exists($svgFile)) die('Invalid fontawesome icon');
} else {
	// invalid
	die('Unknown SVG');
}
$settings['svg'] = $svgFile;

// set path color
if (isset($_GET['color']) && preg_match('~^\#?[a-f0-9]{6}$~i', $_GET['color'])) {
	$tmp = 'image-converter/svg/'.md5($svgFile);
	$svg = file_get_contents($svgFile);
	$color = ($_GET['color'][0] !== '#' ? '#' : '').$_GET['color'];
	$settings['color'] = $color;
	$svg = preg_replace_callback('~<path[^>]*>~', function($m) use ($color) {
		if (preg_match('~\s+fill="(.*?)"~', $m[0], $pm)) {
			return str_replace($pm[0], ' fill="'.$color.'"', $m[0]);
		} else {
			return '<path fill="'.$color.'"'.substr($m[0], 5);
		}
	}, $svg);
	Tmp::set($tmp, $svg);
	$svgFile = DIR_LIB.'/data/tmp/'.$tmp.'.data';
}

// dimensions
$width = false; $height = false;
// force same width and height (not proportional)
if (isset($_GET['size'])) {
	$_GET['width'] = $_GET['size'];
	$_GET['height'] = $_GET['size'];
}

// set specific dimensions (setting only one is proportional)
if (isset($_GET['width']) && $_GET['width'] > 0 && $_GET['width'] <= 1024) $width = +$_GET['width'];
if (isset($_GET['height']) && $_GET['height'] > 0 && $_GET['height'] <= 1024) $height = +$_GET['height'];
$settings['width'] = $width;
$settings['height'] = $height;

// cache path
$tmpPath = DIR_LIB.'/data/tmp/image-converter/svg-converted/'.md5(json_encode($settings)).'.png';
if (!is_dir(dirname($tmpPath))) @mkdir(dirname($tmpPath), 0777, true);

if (!file_exists($tmpPath) || filemtime($tmpPath) <= filemtime(__FILE__)) {
	// recache
	$command = 'inkscape'.($width ? ' -w '.$width : '').($height ? ' -h '.$height : '').' "'.$svgFile.'" -e "'.$tmpPath.'"';
	exec($command);
}

// show image
header('Content-Type: image/png');
readfile($tmpPath);