Current File : //www/varak.net/nextcloud.varak.net/nextcloud/3rdparty/fusonic/opengraph/src/Consumer.php
<?php
namespace Fusonic\OpenGraph;
use Fusonic\OpenGraph\Objects\ObjectBase;
use Fusonic\OpenGraph\Objects\Website;
use LogicException;
use Psr\Http\Client\ClientExceptionInterface;
use Psr\Http\Client\ClientInterface;
use Psr\Http\Message\RequestFactoryInterface;
use Symfony\Component\DomCrawler\Crawler;
/**
* Consumer that extracts Open Graph data from either a URL or a HTML string.
*/
class Consumer
{
private ?ClientInterface $client;
private ?RequestFactoryInterface $requestFactory;
/**
* When enabled, crawler will read content of title and meta description if no
* Open Graph data is provided by target page.
*/
public bool $useFallbackMode = false;
/**
* When enabled, crawler will throw exceptions for some crawling errors like unexpected
* Open Graph elements.
*/
public bool $debug = false;
/**
* @param ClientInterface|null $client A PSR-18 ClientInterface implementation.
* @param RequestFactoryInterface|null $requestFactory A PSR-17 RequestFactoryInterface implementation.
*/
public function __construct(?ClientInterface $client = null, ?RequestFactoryInterface $requestFactory = null)
{
$this->client = $client;
$this->requestFactory = $requestFactory;
}
/**
* Fetches HTML content from the given URL and then crawls it for Open Graph data.
*
* @param string $url URL to be crawled.
*
* @return ObjectBase
*
* @throws ClientExceptionInterface
*/
public function loadUrl(string $url): ObjectBase
{
if ($this->client === null) {
throw new LogicException(
"To use loadUrl() you must provide \$client and \$requestFactory when instantiating the consumer."
);
}
$request = $this->requestFactory->createRequest("GET", $url);
$response = $this->client->sendRequest($request);
return $this->loadHtml($response->getBody()->getContents(), $url);
}
/**
* Crawls the given HTML string for OpenGraph data.
*
* @param string $html HTML string, usually whole content of crawled web resource.
* @param string $fallbackUrl URL to use when fallback mode is enabled.
*
* @return ObjectBase
*/
public function loadHtml(string $html, string $fallbackUrl = null): ObjectBase
{
// Extract all data that can be found
$page = $this->extractOpenGraphData($html);
// Use the user's URL as fallback
if ($this->useFallbackMode && $page->url === null) {
$page->url = $fallbackUrl;
}
// Return result
return $page;
}
private function extractOpenGraphData(string $content): ObjectBase
{
$crawler = new Crawler;
$crawler->addHTMLContent($content, 'UTF-8');
$properties = [];
foreach(['name', 'property'] as $t)
{
// Get all meta-tags starting with "og:"
$ogMetaTags = $crawler->filter("meta[{$t}^='og:']");
// Create clean property array
$props = [];
foreach ($ogMetaTags as $tag) {
$name = strtolower(trim($tag->getAttribute($t)));
$value = trim($tag->getAttribute("content"));
$props[] = new Property($name, $value);
}
$properties = array_merge($properties, $props);
}
// Create new object
$object = new Website();
// Assign all properties to the object
$object->assignProperties($properties, $this->debug);
// Fallback for url
if ($this->useFallbackMode && !$object->url) {
$urlElement = $crawler->filter("link[rel='canonical']")->first();
if ($urlElement->count() > 0) {
$object->url = trim($urlElement->attr("href"));
}
}
// Fallback for title
if ($this->useFallbackMode && !$object->title) {
$titleElement = $crawler->filter("title")->first();
if ($titleElement->count() > 0) {
$object->title = trim($titleElement->text());
}
}
// Fallback for description
if ($this->useFallbackMode && !$object->description) {
$descriptionElement = $crawler->filter("meta[property='description']")->first();
if ($descriptionElement->count() > 0) {
$object->description = trim($descriptionElement->attr("content"));
}
}
return $object;
}
}
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