diff options
Diffstat (limited to 'favicon.php')
| -rw-r--r-- | favicon.php | 362 |
1 files changed, 362 insertions, 0 deletions
diff --git a/favicon.php b/favicon.php new file mode 100644 index 0000000..dadb923 --- /dev/null +++ b/favicon.php @@ -0,0 +1,362 @@ +<?php + +if(!isset($_GET["s"])){ + + header("X-Error: Missing parameter (s)ite"); + die(); +} + +new favicon($_GET["s"]); + +class favicon{ + + public function __construct($url){ + + header("Content-Type: image/png"); + + if(substr_count($url, "/") !== 2){ + + header("X-Error: Only provide the protocol and domain"); + $this->defaulticon(); + } + + $filename = str_replace(["https://", "http://"], "", $url); + header("Content-Disposition: inline; filename=\"{$filename}.png\""); + + include "lib/curlproxy.php"; + $this->proxy = new proxy(false); + + $this->filename = parse_url($url, PHP_URL_HOST); + + /* + Check if we have the favicon stored locally + */ + if(file_exists("icons/" . $filename . ".png")){ + + $handle = fopen("icons/" . $filename . ".png", "r"); + echo fread($handle, filesize("icons/" . $filename . ".png")); + fclose($handle); + return; + } + + /* + Scrape html + */ + try{ + + $payload = $this->proxy->get($url, $this->proxy::req_web, true); + + }catch(Exception $error){ + + header("X-Error: Could not fetch HTML (" . $error->getMessage() . ")"); + $this->favicon404(); + } + //$payload["body"] = '<link rel="manifest" id="MANIFEST_LINK" href="/data/manifest/" crossorigin="use-credentials" />'; + + // get link tags + preg_match_all( + '/< *link +(.*)[\/]?>/Uixs', + $payload["body"], + $linktags + ); + + /* + Get relevant tags + */ + + $linktags = $linktags[1]; + $attributes = []; + + /* + header("Content-Type: text/plain"); + print_r($linktags); + print_r($payload); + die();*/ + + for($i=0; $i<count($linktags); $i++){ + + // get attributes + preg_match_all( + '/([A-Za-z0-9]+) *= *("[^"]*"|[^" ]+)/s', + $linktags[$i], + $tags + ); + + for($k=0; $k<count($tags[1]); $k++){ + + $attributes[$i][] = [ + "name" => $tags[1][$k], + "value" => trim($tags[2][$k], "\" \n\r\t\v\x00") + ]; + } + } + + unset($payload); + unset($linktags); + + $href = []; + + // filter out the tags we want + foreach($attributes as &$group){ + + $tmp_href = null; + $tmp_rel = null; + $badtype = false; + + foreach($group as &$attribute){ + + switch($attribute["name"]){ + + case "rel": + + $attribute["value"] = strtolower($attribute["value"]); + + if( + ( + $attribute["value"] == "icon" || + $attribute["value"] == "manifest" || + $attribute["value"] == "shortcut icon" || + $attribute["value"] == "apple-touch-icon" || + $attribute["value"] == "mask-icon" + ) === false + ){ + + break; + } + + $tmp_rel = $attribute["value"]; + break; + + case "type": + $attribute["value"] = explode("/", $attribute["value"], 2); + + if(strtolower($attribute["value"][0]) != "image"){ + + $badtype = true; + break; + } + break; + + case "href": + + // must not contain invalid characters + // must be bigger than 1 + if( + filter_var($attribute["value"], FILTER_SANITIZE_URL) == $attribute["value"] && + strlen($attribute["value"]) > 0 + ){ + + $tmp_href = $attribute["value"]; + break; + } + break; + } + } + + if( + $badtype === false && + $tmp_rel !== null && + $tmp_href !== null + ){ + + $href[$tmp_rel] = $tmp_href; + } + } + + /* + Priority list + */ + /* + header("Content-Type: text/plain"); + print_r($href); + die();*/ + + if(isset($href["icon"])){ $href = $href["icon"]; } + elseif(isset($href["apple-touch-icon"])){ $href = $href["apple-touch-icon"]; } + elseif(isset($href["manifest"])){ + + // attempt to parse manifest, but fallback to [] + $href = $this->parsemanifest($href["manifest"], $url); + } + + if(is_array($href)){ + + if(isset($href["mask-icon"])){ $href = $href["mask-icon"]; } + elseif(isset($href["shortcut icon"])){ $href = $href["shortcut icon"]; } + else{ + + $href = "/favicon.ico"; + } + } + + $href = $this->proxy->getabsoluteurl($href, $url); + /* + header("Content-type: text/plain"); + echo $href; + die();*/ + + + /* + Download the favicon + */ + //$href = "https://git.lolcat.ca/assets/img/logo.svg"; + + try{ + $payload = + $this->proxy->get( + $href, + $this->proxy::req_image, + true, + $url + ); + + }catch(Exception $error){ + + header("X-Error: Could not fetch the favicon (" . $error->getMessage() . ")"); + $this->favicon404(); + } + + /* + Parse the file format + */ + $image = null; + $format = $this->proxy->getimageformat($payload, $image); + + /* + Convert the image + */ + try{ + + /* + @todo: fix issues with avif+transparency + maybe using GD as fallback? + */ + if($format !== false){ + $image->setFormat($format); + } + + $image->setBackgroundColor(new ImagickPixel("transparent")); + $image->readImageBlob($payload["body"]); + $image->resizeImage(16, 16, imagick::FILTER_LANCZOS, 1); + $image->setFormat("png"); + + $image = $image->getImageBlob(); + + // save favicon + $handle = fopen("icons/" . $this->filename . ".png", "w"); + fwrite($handle, $image, strlen($image)); + fclose($handle); + + echo $image; + + }catch(ImagickException $error){ + + header("X-Error: Could not convert the favicon: (" . $error->getMessage() . ")"); + $this->favicon404(); + } + + return; + } + + private function parsemanifest($href, $url){ + + if( + // check if base64-encoded JSON manifest + preg_match( + '/^data:application\/json;base64,([A-Za-z0-9=]*)$/', + $href, + $json + ) + ){ + + $json = base64_decode($json[1]); + + if($json === false){ + + // could not decode the manifest regex + return []; + } + + }else{ + + try{ + $json = + $this->proxy->get( + $this->proxy->getabsoluteurl($href, $url), + $this->proxy::req_web, + false, + $url + ); + + $json = $json["body"]; + + }catch(Exception $error){ + + // could not fetch the manifest + return []; + } + } + + $json = json_decode($json, true); + + if($json === null){ + + // manifest did not return valid json + return []; + } + + if( + isset($json["start_url"]) && + $this->proxy->validateurl($json["start_url"]) + ){ + + $url = $json["start_url"]; + } + + if(!isset($json["icons"][0]["src"])){ + + // manifest does not contain a path to the favicon + return []; + } + + // horay, return the favicon path + return $json["icons"][0]["src"]; + } + + private function favicon404(){ + + // fallback to google favicons + // ... probably blocked by cuckflare + try{ + + $image = + $this->proxy->get( + "https://t0.gstatic.com/faviconV2?client=SOCIAL&type=FAVICON&fallback_opts=TYPE,SIZE,URL&url=http://{$this->filename}&size=16", + $this->proxy::req_image + ); + }catch(Exception $error){ + + $this->defaulticon(); + } + + // write favicon from google + $handle = fopen("icons/" . $this->filename . ".png", "w"); + fwrite($handle, $image["body"], strlen($image["body"])); + fclose($handle); + + echo $image["body"]; + die(); + } + + private function defaulticon(){ + + // give 404 and fuck off + http_response_code(404); + + $handle = fopen("lib/favicon404.png", "r"); + echo fread($handle, filesize("lib/favicon404.png")); + fclose($handle); + + die(); + } +} |