class Endpoint

class Endpoint {
    
    /**
     * The endpoint's URL.
     *
     * @var string
     */
    protected $url;
    
    /**
     * The provider this endpoint belongs to.
     *
     * @var \Drupal\media\OEmbed\Provider
     */
    protected $provider;
    
    /**
     * List of URL schemes supported by the provider.
     *
     * @var string[]
     */
    protected $schemes;
    
    /**
     * List of supported formats. Only 'json' and 'xml' are allowed.
     *
     * @var string[]
     *
     * @see https://oembed.com/#section2
     */
    protected $formats;
    
    /**
     * Whether the provider supports oEmbed discovery.
     *
     * @var bool
     */
    protected $supportsDiscovery;
    
    /**
     * Endpoint constructor.
     *
     * @param string $url
     *   The endpoint URL. May contain a @code '{format}' @endcode placeholder.
     * @param \Drupal\media\OEmbed\Provider $provider
     *   The provider this endpoint belongs to.
     * @param string[] $schemes
     *   List of URL schemes supported by the provider.
     * @param string[] $formats
     *   List of supported formats. Can be "json", "xml" or both.
     * @param bool $supports_discovery
     *   Whether the provider supports oEmbed discovery.
     *
     * @throws \InvalidArgumentException
     *   If the endpoint URL is empty.
     */
    public function __construct($url, Provider $provider, array $schemes = [], array $formats = [], $supports_discovery = FALSE) {
        $this->provider = $provider;
        $this->schemes = $schemes;
        $this->formats = $formats = array_map('mb_strtolower', $formats);
        // Assert that only the supported formats are present.
        assert(array_diff($formats, [
            'json',
            'xml',
        ]) == []);
        // Use the first provided format to build the endpoint URL. If no formats
        // are provided, default to JSON.
        $this->url = str_replace('{format}', reset($this->formats) ?: 'json', $url);
        if (!UrlHelper::isValid($this->url, TRUE) || !UrlHelper::isExternal($this->url)) {
            throw new \InvalidArgumentException('oEmbed endpoint must have a valid external URL');
        }
        $this->supportsDiscovery = (bool) $supports_discovery;
    }
    
    /**
     * Returns the endpoint URL.
     *
     * The URL will be built with the first available format. If the endpoint
     * does not provide any formats, JSON will be used.
     *
     * @return string
     *   The endpoint URL.
     */
    public function getUrl() {
        return $this->url;
    }
    
    /**
     * Returns the provider this endpoint belongs to.
     *
     * @return \Drupal\media\OEmbed\Provider
     *   The provider object.
     */
    public function getProvider() {
        return $this->provider;
    }
    
    /**
     * Returns list of URL schemes supported by the provider.
     *
     * @return string[]
     *   List of schemes.
     */
    public function getSchemes() {
        return $this->schemes;
    }
    
    /**
     * Returns list of supported formats.
     *
     * @return string[]
     *   List of formats.
     */
    public function getFormats() {
        return $this->formats;
    }
    
    /**
     * Returns whether the provider supports oEmbed discovery.
     *
     * @return bool
     *   Returns TRUE if the provides discovery, otherwise FALSE.
     */
    public function supportsDiscovery() {
        return $this->supportsDiscovery;
    }
    
    /**
     * Tries to match a URL against the endpoint schemes.
     *
     * @param string $url
     *   Media item URL.
     *
     * @return bool
     *   TRUE if the URL matches against the endpoint schemes, otherwise FALSE.
     */
    public function matchUrl($url) {
        foreach ($this->getSchemes() as $scheme) {
            // Convert scheme into a valid regular expression.
            $regexp = str_replace([
                '.',
                '*',
                '?',
            ], [
                '\\.',
                '.*',
                '\\?',
            ], $scheme);
            if (preg_match("|^{$regexp}\$|", $url)) {
                return TRUE;
            }
        }
        return FALSE;
    }
    
    /**
     * Builds and returns the endpoint URL.
     *
     * In most situations this function should not be used. Your are probably
     * looking for \Drupal\media\OEmbed\UrlResolver::getResourceUrl(), because it
     * is alterable and also cached.
     *
     * @param string $url
     *   The canonical media URL.
     *
     * @return string
     *   URL of the oEmbed endpoint.
     *
     * @see \Drupal\media\OEmbed\UrlResolver::getResourceUrl()
     */
    public function buildResourceUrl($url) {
        $query = [
            'url' => $url,
        ];
        return $this->getUrl() . '?' . UrlHelper::buildQuery($query);
    }

}