getFieldNameFromPlaceholder($value); if ($fieldName === false) { return $this->encode($value); } $pageImage = $this->getPageImage($fieldName); if ($pageImage === null) { return ''; } return $pageImage->httpUrl(); } if ($this->containsPlaceholder($value)) { $value = wirePopulateStringTags($value, $this->pageFieldValue->getPage()); } return $this->encode($value); } /** * @inheritdoc */ protected function sanitizeValue($name, $value) { return (string)$value; } /** * @inheritdoc */ protected function renderMetatags(array $data) { $tags = []; foreach ($data as $name) { $value = $this->get($name); if (!$value) { continue; } $metaName = $this->getMetaName($name); $tags[$name] = $this->renderTag($metaName, $value); // Add additional image meta tags for the type, width and height. if ($name === 'image') { $fieldName = $this->getFieldNameFromPlaceholder($this->getUnformatted($name)); if ($fieldName === false) { // External image source. list($width, $height, $typeId) = @getimagesize($value); if ($width !== null) { $tags['imageType'] = $this->renderTag('image:type', sprintf('image/%s', $this->getImageType($typeId))); $tags['imageWidth'] = $this->renderTag('image:width', $width); $tags['imageHeight'] = $this->renderTag('image:height', $height); } } else { // Image from a PageImage object. $pageImage = $this->getPageImage($fieldName); if ($pageImage === null) { continue; } $ext = $pageImage->ext === 'jpg' ? 'jpeg' : $pageImage->ext; $tags['imageType'] = $this->renderTag('image:type', sprintf('image/%s', $ext)); $tags['imageWidth'] = $this->renderTag('image:width', $pageImage->width); $tags['imageHeight'] = $this->renderTag('image:height', $pageImage->height); } } } $tags['url'] = $this->renderTag('url', $this->pageFieldValue->getPage()->httpUrl); return $tags; } private function renderTag($name, $value) { return sprintf('', $name, $value); } private function getMetaName($name) { $mapping = [ 'imageAlt' => 'image:alt', 'siteName' => 'site_name', ]; return $mapping[$name] ?? $name; } private function getImageType($id) { $types = [ 1 => 'gif', 2 => 'jpeg', 3 => 'png', ]; return $types[$id] ?? ''; } /** * @param string $fieldName * * @return \ProcessWire\Pageimage|null */ private function getPageImage($fieldName) { $pageImages = $this->pageFieldValue->getPage()->getUnformatted($fieldName); if (!$pageImages instanceof Pageimages) { return null; } if ($pageImages->count()) { return $this->resizeImage($pageImages->first()); } // Check if the image falls back to an image from another page. $field = $this->wire('fields')->get($fieldName); if (!$field->get('defaultValuePage')) { return null; } $defaultPage = $this->wire('pages')->get((int)$field->get('defaultValuePage')); if ($defaultPage->id && $defaultPage->id !== $this->pageFieldValue->getPage()->id) { $pageImages = $defaultPage->getUnformatted($fieldName); if (!$pageImages->count()) { return null; } return $this->resizeImage($pageImages->first()); } return null; } private function resizeImage(Pageimage $pageImage) { $field = $this->getFieldInCurrentContext(); $width = $field->get('opengraph_image_width'); $height = $field->get('opengraph_image_height'); if ($width || $height) { if ($width && $height) { $pageImage = $pageImage->size((int)$width, (int)$height); } elseif ($width) { $pageImage = $pageImage->width((int)$width); } elseif ($height) { $pageImage = $pageImage->height((int)$height); } } return $pageImage; } /** * @param string $value * * @return string|bool */ private function getFieldNameFromPlaceholder($value) { if ($value && preg_match('/^\{(.*)\}$/', $value, $matches)) { return $matches[1]; } return false; } }