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<?php
declare(strict_types=1);
const FAVICONS_DIR = DATA_PATH . '/favicons/';
const DEFAULT_FAVICON = PUBLIC_PATH . '/themes/icons/default_favicon.ico';
function isImgMime(string $content): bool {
//Based on https://github.com/ArthurHoaro/favicon/blob/3a4f93da9bb24915b21771eb7873a21bde26f5d1/src/Favicon/Favicon.php#L311-L319
if ($content == '') {
return false;
}
if (!extension_loaded('fileinfo')) {
return true;
}
$isImage = true;
/** @var finfo $fInfo */
$fInfo = finfo_open(FILEINFO_MIME_TYPE);
/** @var string $content */
$content = finfo_buffer($fInfo, $content);
$isImage = strpos($content, 'image') !== false;
finfo_close($fInfo);
return $isImage;
}
/** @param array<int,int|bool|string> $curlOptions */
function downloadHttp(string &$url, array $curlOptions = []): string {
syslog(LOG_INFO, 'FreshRSS Favicon GET ' . $url);
$url2 = checkUrl($url);
if ($url2 == false) {
return '';
}
$url = $url2;
/** @var CurlHandle $ch */
$ch = curl_init($url);
curl_setopt_array($ch, [
CURLOPT_RETURNTRANSFER => true,
CURLOPT_TIMEOUT => 15,
CURLOPT_USERAGENT => FRESHRSS_USERAGENT,
CURLOPT_MAXREDIRS => 10,
CURLOPT_FOLLOWLOCATION => true,
CURLOPT_ENCODING => '', //Enable all encodings
//CURLOPT_VERBOSE => 1, // To debug sent HTTP headers
]);
FreshRSS_Context::initSystem();
if (FreshRSS_Context::hasSystemConf()) {
curl_setopt_array($ch, FreshRSS_Context::systemConf()->curl_options);
}
curl_setopt_array($ch, $curlOptions);
$response = curl_exec($ch);
if (!is_string($response)) {
$response = '';
}
$info = curl_getinfo($ch);
curl_close($ch);
if (!empty($info['url'])) {
$url2 = checkUrl($info['url']);
if ($url2 != false) {
$url = $url2; //Possible redirect
}
}
return is_array($info) && $info['http_code'] == 200 ? $response : '';
}
function searchFavicon(string &$url): string {
$dom = new DOMDocument();
$html = downloadHttp($url);
if ($html == '' || !@$dom->loadHTML($html, LIBXML_NONET | LIBXML_NOERROR | LIBXML_NOWARNING)) {
return '';
}
$xpath = new DOMXPath($dom);
$links = $xpath->query('//link[@href][translate(@rel, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz")="shortcut icon"'
. ' or translate(@rel, "ABCDEFGHIJKLMNOPQRSTUVWXYZ", "abcdefghijklmnopqrstuvwxyz")="icon"]');
if (!($links instanceof DOMNodeList)) {
return '';
}
// Use the base element for relative paths, if there is one
$baseElements = $xpath->query('//base[@href]');
$baseElement = ($baseElements !== false && $baseElements->length > 0) ? $baseElements->item(0) : null;
$baseUrl = ($baseElement instanceof DOMElement) ? $baseElement->getAttribute('href') : $url;
foreach ($links as $link) {
if (!$link instanceof DOMElement) {
continue;
}
$href = trim($link->getAttribute('href'));
$urlParts = parse_url($url);
// Handle protocol-relative URLs by adding the current URL's scheme
if (substr($href, 0, 2) === '//') {
$href = ($urlParts['scheme'] ?? 'https') . ':' . $href;
}
$href = \SimplePie\IRI::absolutize($baseUrl, $href);
if ($href == false) {
return '';
}
$iri = $href->get_iri();
if ($iri == false) {
return '';
}
$favicon = downloadHttp($iri, [CURLOPT_REFERER => $url]);
if (isImgMime($favicon)) {
return $favicon;
}
}
return '';
}
function download_favicon(string $url, string $dest): bool {
$url = trim($url);
$favicon = searchFavicon($url);
if ($favicon == '') {
$rootUrl = preg_replace('%^(https?://[^/]+).*$%i', '$1/', $url) ?? $url;
if ($rootUrl != $url) {
$url = $rootUrl;
$favicon = searchFavicon($url);
}
if ($favicon == '') {
$link = $rootUrl . 'favicon.ico';
$favicon = downloadHttp($link, [CURLOPT_REFERER => $url]);
if (!isImgMime($favicon)) {
$favicon = '';
}
}
}
return ($favicon != '' && file_put_contents($dest, $favicon) > 0) ||
@copy(DEFAULT_FAVICON, $dest);
}
function contentType(string $ico): string {
$ico_content_type = 'image/x-icon';
if (function_exists('mime_content_type')) {
$ico_content_type = mime_content_type($ico) ?: $ico_content_type;
}
switch ($ico_content_type) {
case 'image/svg':
$ico_content_type = 'image/svg+xml';
break;
}
return $ico_content_type;
}
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