imageproxy/index.php

<?php
// include composer autoload
require 'vendor/autoload.php';
ini_set('memory_limit', '4G');
ini_set( 'user_agent', 'CoolBot/0.0 (https://example.org/coolbot/; coolbot@example.org)' );
error_reporting(E_ALL);
ini_set('display_errors', 1);
// import the Intervention Image Manager Class
use Intervention\Image\Exceptions\DecoderException;
use Intervention\Image\ImageManager;
use Symfony\Component\HttpFoundation\Response;

// create an image manager instance with favored driver
$manager = new ImageManager(\Intervention\Image\Drivers\Gd\Driver::class);
if(php_sapi_name() == 'cli') {
    $args = NULL;
    parse_str($argv[1], $args);
} else {
    $args = $_GET;
}
$options = [
    'url' => $args['url'],
    'height' => $args['h'] ?? NULL,
    'width' => $args['w'] ?? NULL,
    'canvasheight' => $args['ch'] ?? NULL,
    'canvaswidth' => $args['cw'] ?? NULL,
    'format' => $args['format'] ?? NULL,
    'fill' => $args['fill'] ?? NULL,
];
$cachefolder = [];
foreach($options as $key => $option) {
    if($key != 'url' && $option != NULL) $cachefolder[] = $key . '-' . $option;
}
$cachefolder = implode('_', $cachefolder);
$cachefile = preg_replace("/[^A-Za-z0-9]/", '-', $options['url']);

if(is_dir('cache/' . $cachefolder)) {
	if(is_file('cache/'. $cachefolder . '/' . $cachefile) && (filemtime('cache/'. $cachefolder . '/' . $cachefile) > (time() - (60*60*24*30)))) {
        sendFile('cache/' . $cachefolder . '/' . $cachefile);
		exit;
	}
};
$imagecontent = file_get_contents($options['url']);
if(isSvg($imagecontent)) {
    $image = new Imagick();
    $image->setBackgroundColor('none');
    $image->readImageBlob($imagecontent);
    $image->setImageFormat("png64");
    $image->resizeImage(2000,2000, imagick::FILTER_QUADRATIC, 0.7, true);
    $imagecontent = $image->getImageBlob();
}

$transparent = (new \Intervention\Image\Colors\Rgb\Color(0,0,0,0));
// to finally create image instances
$image = $manager
    ->read($imagecontent);

if(isset($options['width']) || isset($options['height'])) {
    $image = $image->pad($options['width'], $options['height'], $transparent);
}
if(isset($options['canvaswidth']) || isset($options['canvasheight'])) {
    $image = $image->resizeCanvas($options['canvaswidth'], $options['canvasheight'], $transparent);
}

if (isset($options['fill'])) {
    $image = $image->blendTransparency($options['fill']);
}

// send HTTP header and output image data
if(!is_dir('cache/' . $cachefolder)) mkdir('cache/' . $cachefolder);
if(isset($args['format'])) {
    $image = $image->encodeByExtension($args['format']);
}
$image->save('cache/' . $cachefolder . '/' . $cachefile);
sendFile('cache/' . $cachefolder . '/' . $cachefile);

function sendFile($filepath) {
    $filecontents = file_get_contents($filepath);
    $mime = finfo_buffer(finfo_open(FILEINFO_MIME_TYPE), $filecontents);
    $length = strlen($filecontents);

    $response = new Response($filecontents, Response::HTTP_OK, ['Content-Type' => $mime, 'Content-Length' => $length]);
    $response->send();
}

function isSvg($content)
{
    // Controleer of de inhoud begint met de kenmerkende SVG-declaratie
    return strpos($content, '<svg') !== false;
}