54 lines
1.7 KiB
PHP
54 lines
1.7 KiB
PHP
<?php
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namespace App\MetadataResolver;
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class OGPResolver implements Resolver
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{
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public function resolve(string $url): Metadata
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{
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$client = new \GuzzleHttp\Client();
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$res = $client->get($url);
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if ($res->getStatusCode() === 200) {
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return $this->parse($res->getBody());
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} else {
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throw new \RuntimeException("{$res->getStatusCode()}: $url");
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}
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}
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public function parse(string $html): Metadata
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{
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$dom = new \DOMDocument();
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@$dom->loadHTML(mb_convert_encoding($html, 'HTML-ENTITIES', 'ASCII,JIS,UTF-8,eucJP-win,SJIS-win'));
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$xpath = new \DOMXPath($dom);
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$metadata = new Metadata();
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$metadata->title = $this->findContent($xpath, '//meta[@*="og:title"]', '//meta[@*="twitter:title"]');
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if (empty($metadata->title)) {
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$nodes = $xpath->query('//title');
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if ($nodes->length !== 0) {
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$metadata->title = $nodes->item(0)->textContent;
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}
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}
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$metadata->description = $this->findContent($xpath, '//meta[@*="og:description"]', '//meta[@*="twitter:description"]');
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$metadata->image = $this->findContent($xpath, '//meta[@*="og:image"]', '//meta[@*="twitter:image"]');
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return $metadata;
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}
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private function findContent(\DOMXPath $xpath, string ...$expressions)
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{
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foreach ($expressions as $expression) {
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$nodes = $xpath->query($expression);
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foreach ($nodes as $node) {
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$content = $node->getAttribute('content');
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if (!empty($content)) {
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return $content;
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}
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}
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}
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return '';
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}
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}
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