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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;
}
$fInfo = finfo_open(FILEINFO_MIME_TYPE);
if ($fInfo === false) {
return true;
}
$content = finfo_buffer($fInfo, $content);
$isImage = str_contains($content ?: '', 'image');
return $isImage;
}
function faviconCachePath(string $url): string {
return CACHE_PATH . '/' . sha1($url) . '.ico';
}
function searchFavicon(string $url): string {
$url = trim($url);
if ($url === '') {
return '';
}
$dom = new DOMDocument();
['body' => $html, 'effective_url' => $effective_url, 'fail' => $fail] =
FreshRSS_http_Util::httpGet($url, cachePath: CACHE_PATH . '/' . sha1($url) . '.html', type: 'html');
if ($fail || $html === '' || !@$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') : $effective_url;
foreach ($links as $link) {
if (!$link instanceof DOMElement) {
continue;
}
$href = trim($link->getAttribute('href'));
$urlParts = parse_url($effective_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 '';
}
$favicon = FreshRSS_http_Util::httpGet($iri, faviconCachePath($iri), 'ico', curl_options: [
CURLOPT_REFERER => $effective_url,
])['body'];
if (isImgMime($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';
$favicon = FreshRSS_http_Util::httpGet($link, faviconCachePath($link), 'ico', curl_options: [
CURLOPT_REFERER => $url,
])['body'];
if (!isImgMime($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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