function OEmbedFormatter::viewElements

Overrides FormatterInterface::viewElements

File

core/modules/media/src/Plugin/Field/FieldFormatter/OEmbedFormatter.php, line 159

Class

OEmbedFormatter

Plugin implementation of the 'oembed' formatter.

Namespace

Code

public function viewElements(FieldItemListInterface $items, $langcode) {
    $element = [];
    $max_width = $this->getSetting('max_width');
    $max_height = $this->getSetting('max_height');
    foreach ($items as $delta => $item) {
        $main_property = $item->getFieldDefinition()
            ->getFieldStorageDefinition()
            ->getMainPropertyName();
        $value = $item->{$main_property};
        if (empty($value)) {
            continue;
        }
        try {
            $resource_url = $this->urlResolver
                ->getResourceUrl($value, $max_width, $max_height);
            $resource = $this->resourceFetcher
                ->fetchResource($resource_url);
        } catch (ResourceException $exception) {
            $this->logger
                ->error("Could not retrieve the remote URL (@url).", [
                '@url' => $value,
            ]);
            continue;
        }
        if ($resource->getType() === Resource::TYPE_LINK) {
            $element[$delta] = [
                '#title' => $resource->getTitle(),
                '#type' => 'link',
                '#url' => Url::fromUri($value),
            ];
        }
        elseif ($resource->getType() === Resource::TYPE_PHOTO) {
            $element[$delta] = [
                '#theme' => 'image',
                '#uri' => $resource->getUrl()
                    ->toString(),
                '#width' => $max_width ?: $resource->getWidth(),
                '#height' => $max_height ?: $resource->getHeight(),
            ];
        }
        else {
            $url = Url::fromRoute('media.oembed_iframe', [], [
                'query' => [
                    'url' => $value,
                    'max_width' => $max_width,
                    'max_height' => $max_height,
                    'hash' => $this->iFrameUrlHelper
                        ->getHash($value, $max_width, $max_height),
                ],
            ]);
            $domain = $this->config
                ->get('iframe_domain');
            if ($domain) {
                $url->setOption('base_url', $domain);
            }
            // Render videos and rich content in an iframe for security reasons.
            // @see: https://oembed.com/#section3
            $element[$delta] = [
                '#type' => 'html_tag',
                '#tag' => 'iframe',
                '#attributes' => [
                    'src' => $url->toString(),
                    'frameborder' => 0,
                    'scrolling' => FALSE,
                    'allowtransparency' => TRUE,
                    'width' => $max_width ?: $resource->getWidth(),
                    'height' => $max_height ?: $resource->getHeight(),
                    'class' => [
                        'media-oembed-content',
                    ],
                ],
                '#attached' => [
                    'library' => [
                        'media/oembed.formatter',
                    ],
                ],
            ];
            // An empty title attribute will disable title inheritance, so only
            // add it if the resource has a title.
            $title = $resource->getTitle();
            if ($title) {
                $element[$delta]['#attributes']['title'] = $title;
            }
            CacheableMetadata::createFromObject($resource)->addCacheTags($this->config
                ->getCacheTags())
                ->applyTo($element[$delta]);
        }
    }
    return $element;
}