laravel-favicon-extractor.php

<?php

namespace App\Services;

use Arr;
use Str;
use Illuminate\Support\Facades\Cache;

class FaviconExtractor
{
    protected string $baseUrl;

    public function __construct(string $baseUrl)
    {
        $this->baseUrl = $baseUrl;
    }

    public static function from(string $baseUrl)
    {
        $baseUrl = rtrim($baseUrl, '/');
        $extractor = new static($baseUrl);

        return Cache::remember(
            'favicon-extractor.' . md5($baseUrl),
            now()->addWeek(),
            function () use ($baseUrl, $extractor) {
                try {
                    return $extractor->extract($baseUrl);
                } catch (\Exception $e) {
                    return null;
                }
            }
        );
    }

    protected function extract()
    {
        $webManifestUrl = $this->parseWebManifestUrl();

        if (!$webManifestUrl) {
            return null;
        }

        $iconUrl = $this->parseIconUrl($webManifestUrl);

        if (!$iconUrl) {
            return null;
        }

        return file_get_contents($iconUrl);
    }

    protected function parseWebManifestUrl(): ?string
    {
        $html = file_get_contents($this->baseUrl);

        preg_match('/<link[^>]+rel="manifest"[^>]+href="(?<manifestUrl>[^"]+)"/', $html, $matches);

        if (isset($matches['manifestUrl']) && $matches['manifestUrl']) {
            $manifestUrl = $matches['manifestUrl'];

            if (!Str::startsWith($manifestUrl, 'http')) {
                $manifestUrl = $this->baseUrl . $manifestUrl;
            }

            return $manifestUrl;
        }

        return null;
    }

    protected function parseIconUrl(string $webManifestUrl): ?string
    {
        $webManifest = json_decode(file_get_contents($webManifestUrl), true);
        $iconUrl = Arr::get($webManifest, 'icons.0.src');

        if (!$iconUrl) {
            return null;
        }

        if (!Str::startsWith($iconUrl, ['http', '/'])) {
            $iconUrl = Str::beforeLast($webManifestUrl, '/') . Str::start($iconUrl, '/');
        } else {
            $iconUrl = $this->baseUrl . $iconUrl;
        }

        return $iconUrl;
    }
}