369 lines
7.1 KiB
PHP
369 lines
7.1 KiB
PHP
<?php
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if(!isset($_GET["s"])){
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header("X-Error: Missing parameter (s)ite");
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die();
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}
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include "data/config.php";
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new favicon($_GET["s"]);
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class favicon{
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public function __construct($url){
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header("Content-Type: image/png");
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if(
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preg_match(
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'/^https?:\/\/[A-Za-z0-9.-]+$/',
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$url
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) === 0
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){
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header("X-Error: Only provide the protocol and domain");
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$this->defaulticon();
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}
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$filename = str_replace(["https://", "http://"], "", $url);
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header("Content-Disposition: inline; filename=\"{$filename}.png\"");
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include "lib/curlproxy.php";
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$this->proxy = new proxy(false);
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$this->filename = parse_url($url, PHP_URL_HOST);
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/*
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Check if we have the favicon stored locally
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*/
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if(file_exists("icons/" . $filename . ".png")){
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$handle = fopen("icons/" . $filename . ".png", "r");
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echo fread($handle, filesize("icons/" . $filename . ".png"));
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fclose($handle);
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return;
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}
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/*
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Scrape html
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*/
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try{
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$payload = $this->proxy->get($url, $this->proxy::req_web, true);
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}catch(Exception $error){
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header("X-Error: Could not fetch HTML (" . $error->getMessage() . ")");
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$this->favicon404();
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}
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//$payload["body"] = '<link rel="manifest" id="MANIFEST_LINK" href="/data/manifest/" crossorigin="use-credentials" />';
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// get link tags
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preg_match_all(
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'/< *link +(.*)[\/]?>/Uixs',
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$payload["body"],
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$linktags
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);
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/*
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Get relevant tags
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*/
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$linktags = $linktags[1];
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$attributes = [];
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/*
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header("Content-Type: text/plain");
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print_r($linktags);
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print_r($payload);
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die();*/
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for($i=0; $i<count($linktags); $i++){
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// get attributes
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preg_match_all(
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'/([A-Za-z0-9]+) *= *("[^"]*"|[^" ]+)/s',
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$linktags[$i],
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$tags
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);
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for($k=0; $k<count($tags[1]); $k++){
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$attributes[$i][] = [
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"name" => $tags[1][$k],
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"value" => trim($tags[2][$k], "\" \n\r\t\v\x00")
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];
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}
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}
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unset($payload);
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unset($linktags);
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$href = [];
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// filter out the tags we want
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foreach($attributes as &$group){
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$tmp_href = null;
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$tmp_rel = null;
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$badtype = false;
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foreach($group as &$attribute){
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switch($attribute["name"]){
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case "rel":
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$attribute["value"] = strtolower($attribute["value"]);
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if(
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(
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$attribute["value"] == "icon" ||
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$attribute["value"] == "manifest" ||
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$attribute["value"] == "shortcut icon" ||
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$attribute["value"] == "apple-touch-icon" ||
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$attribute["value"] == "mask-icon"
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) === false
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){
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break;
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}
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$tmp_rel = $attribute["value"];
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break;
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case "type":
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$attribute["value"] = explode("/", $attribute["value"], 2);
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if(strtolower($attribute["value"][0]) != "image"){
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$badtype = true;
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break;
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}
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break;
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case "href":
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// must not contain invalid characters
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// must be bigger than 1
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if(
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filter_var($attribute["value"], FILTER_SANITIZE_URL) == $attribute["value"] &&
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strlen($attribute["value"]) > 0
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){
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$tmp_href = $attribute["value"];
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break;
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}
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break;
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}
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}
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if(
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$badtype === false &&
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$tmp_rel !== null &&
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$tmp_href !== null
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){
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$href[$tmp_rel] = $tmp_href;
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}
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}
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/*
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Priority list
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*/
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/*
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header("Content-Type: text/plain");
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print_r($href);
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die();*/
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if(isset($href["icon"])){ $href = $href["icon"]; }
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elseif(isset($href["apple-touch-icon"])){ $href = $href["apple-touch-icon"]; }
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elseif(isset($href["manifest"])){
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// attempt to parse manifest, but fallback to []
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$href = $this->parsemanifest($href["manifest"], $url);
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}
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if(is_array($href)){
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if(isset($href["mask-icon"])){ $href = $href["mask-icon"]; }
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elseif(isset($href["shortcut icon"])){ $href = $href["shortcut icon"]; }
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else{
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$href = "/favicon.ico";
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}
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}
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$href = $this->proxy->getabsoluteurl($href, $url);
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/*
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header("Content-type: text/plain");
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echo $href;
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die();*/
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/*
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Download the favicon
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*/
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//$href = "https://git.lolcat.ca/assets/img/logo.svg";
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try{
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$payload =
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$this->proxy->get(
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$href,
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$this->proxy::req_image,
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true,
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$url
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);
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}catch(Exception $error){
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header("X-Error: Could not fetch the favicon (" . $error->getMessage() . ")");
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$this->favicon404();
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}
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/*
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Parse the file format
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*/
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$image = null;
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$format = $this->proxy->getimageformat($payload, $image);
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/*
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Convert the image
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*/
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try{
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/*
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@todo: fix issues with avif+transparency
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maybe using GD as fallback?
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*/
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if($format !== false){
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$image->setFormat($format);
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}
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$image->setBackgroundColor(new ImagickPixel("transparent"));
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$image->readImageBlob($payload["body"]);
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$image->resizeImage(16, 16, imagick::FILTER_LANCZOS, 1);
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$image->setFormat("png");
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$image = $image->getImageBlob();
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// save favicon
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$handle = fopen("icons/" . $this->filename . ".png", "w");
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fwrite($handle, $image, strlen($image));
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fclose($handle);
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echo $image;
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}catch(ImagickException $error){
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header("X-Error: Could not convert the favicon: (" . $error->getMessage() . ")");
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$this->favicon404();
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}
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return;
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}
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private function parsemanifest($href, $url){
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if(
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// check if base64-encoded JSON manifest
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preg_match(
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'/^data:application\/json;base64,([A-Za-z0-9=]*)$/',
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$href,
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$json
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)
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){
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$json = base64_decode($json[1]);
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if($json === false){
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// could not decode the manifest regex
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return [];
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}
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}else{
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try{
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$json =
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$this->proxy->get(
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$this->proxy->getabsoluteurl($href, $url),
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$this->proxy::req_web,
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false,
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$url
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);
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$json = $json["body"];
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}catch(Exception $error){
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// could not fetch the manifest
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return [];
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}
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}
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$json = json_decode($json, true);
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if($json === null){
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// manifest did not return valid json
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return [];
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}
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if(
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isset($json["start_url"]) &&
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$this->proxy->validateurl($json["start_url"])
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){
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$url = $json["start_url"];
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}
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if(!isset($json["icons"][0]["src"])){
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// manifest does not contain a path to the favicon
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return [];
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}
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// horay, return the favicon path
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return $json["icons"][0]["src"];
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}
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private function favicon404(){
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// fallback to google favicons
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// ... probably blocked by cuckflare
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try{
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$image =
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$this->proxy->get(
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"https://t0.gstatic.com/faviconV2?client=SOCIAL&type=FAVICON&fallback_opts=TYPE,SIZE,URL&url=http://{$this->filename}&size=16",
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$this->proxy::req_image
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);
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}catch(Exception $error){
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$this->defaulticon();
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}
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// write favicon from google
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$handle = fopen("icons/" . $this->filename . ".png", "w");
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fwrite($handle, $image["body"], strlen($image["body"]));
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fclose($handle);
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echo $image["body"];
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die();
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}
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private function defaulticon(){
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// give 404 and fuck off
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http_response_code(404);
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$handle = fopen("lib/favicon404.png", "r");
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echo fread($handle, filesize("lib/favicon404.png"));
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fclose($handle);
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die();
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}
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}
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