108 lines
2.9 KiB
PHP
108 lines
2.9 KiB
PHP
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<?php
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namespace App\Support;
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use Illuminate\Http\Client\Response;
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use Illuminate\Support\Facades\Http;
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use Illuminate\Support\Str;
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/**
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* Finds a real, working favicon/icon URL for a site. `{domain}/favicon.ico`
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* is a guess, not a guarantee -- plenty of sites serve their icon from a
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* hashed asset path, an SVG, or declare it only via a <link rel="icon">
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* tag. This tries progressively more reliable sources before giving up.
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*/
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class FaviconResolver
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{
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public function resolve(string $siteUrl): ?string
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{
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return $this->fromWellKnownPath($siteUrl)
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?? $this->fromHtmlLinkTag($siteUrl)
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?? $this->fromGoogleFallback($siteUrl);
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}
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private function fromWellKnownPath(string $siteUrl): ?string
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{
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$candidate = rtrim($siteUrl, '/').'/favicon.ico';
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return $this->isImage($candidate) ? $candidate : null;
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}
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private function fromHtmlLinkTag(string $siteUrl): ?string
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{
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$response = $this->safeGet($siteUrl);
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if (! $response || ! $response->successful()) {
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return null;
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}
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if (! preg_match_all(
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'/<link\b[^>]*rel=["\'](?:shortcut icon|icon|apple-touch-icon)["\'][^>]*>/i',
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$response->body(),
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$tags
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)) {
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return null;
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}
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foreach ($tags[0] as $tag) {
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if (! preg_match('/href=["\']([^"\']+)["\']/i', $tag, $hrefMatch)) {
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continue;
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}
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$absolute = $this->toAbsoluteUrl($hrefMatch[1], $siteUrl);
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if ($absolute && $this->isImage($absolute)) {
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return $absolute;
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}
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}
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return null;
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}
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/**
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* Google's favicon service resolves almost anything (it does its own
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* multi-source lookup), making it a reliable last resort rather than
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* leaving the tool with no logo at all.
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*/
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private function fromGoogleFallback(string $siteUrl): string
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{
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return 'https://www.google.com/s2/favicons?sz=128&domain_url='.urlencode($siteUrl);
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}
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private function toAbsoluteUrl(string $href, string $base): ?string
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{
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if (Str::startsWith($href, ['http://', 'https://'])) {
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return $href;
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}
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$parsed = parse_url($base);
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if (! $parsed || ! isset($parsed['scheme'], $parsed['host'])) {
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return null;
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}
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if (Str::startsWith($href, '//')) {
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return "{$parsed['scheme']}:{$href}";
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}
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return "{$parsed['scheme']}://{$parsed['host']}/".ltrim($href, '/');
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}
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private function isImage(string $url): bool
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{
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$response = $this->safeGet($url);
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return (bool) $response?->successful()
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&& str_starts_with((string) $response->header('Content-Type'), 'image/');
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}
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private function safeGet(string $url): ?Response
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{
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try {
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return Http::timeout(6)->get($url);
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} catch (\Throwable) {
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return null;
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}
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}
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}
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