/**
* Hook executed before saving url_preview user type value. Checks and removes signature of the $value.
* If signature is correct, checks current user's access to $value.
*
* @param array $userField Array containing parameters of the user field.
* @param string $value Signed value of the user field.
* @return int Unsigned value of the user field, or null in case of errors.
*/
public static function onBeforeSave($userField, $value)
{
$imageUrl = null;
if (strpos($value, ';') !== false) {
list($value, $imageUrl) = explode(';', $value);
}
$signer = new Signer();
try {
$value = $signer->unsign($value, UrlPreview::SIGN_SALT);
} catch (SystemException $e) {
return null;
}
$metadata = UrlMetadataTable::getById($value)->fetch();
if (!is_array($metadata)) {
return null;
}
if ($metadata['TYPE'] === UrlMetadataTable::TYPE_STATIC) {
if ($imageUrl && is_array($metadata['EXTRA']['IMAGES']) && in_array($imageUrl, $metadata['EXTRA']['IMAGES'])) {
UrlPreview::setMetadataImage((int) $value, $imageUrl);
}
return $value;
} else {
if ($metadata['TYPE'] === UrlMetadataTable::TYPE_DYNAMIC && UrlPreview::checkDynamicPreviewAccess($metadata['URL'])) {
return $value;
}
}
return null;
}
/**
* Fetches and stores metadata for temporary record, created by UrlPreview::reserveIdForUrl. If metadata could
* not be fetched, deletes record.
* @param int $id Metadata record's id.
* @param bool $checkAccess Should method check current user's access to the entity, or not.
* @return array|false Metadata if fetched, false otherwise.
*/
public static function resolveTemporaryMetadata($id, $checkAccess = true)
{
$metadata = UrlMetadataTable::getById($id)->fetch();
if (!is_array($metadata)) {
return false;
}
if ($metadata['TYPE'] == UrlMetadataTable::TYPE_TEMPORARY) {
$metadata['URL'] = static::normalizeUrl($metadata['URL']);
$metadata = static::fetchUrlMetadata($metadata['URL']);
if ($metadata === false) {
UrlMetadataTable::delete($id);
return false;
}
UrlMetadataTable::update($id, $metadata);
return $metadata;
} else {
if ($metadata['TYPE'] == UrlMetadataTable::TYPE_STATIC || $metadata['TYPE'] == UrlMetadataTable::TYPE_FILE) {
return $metadata;
} else {
if ($metadata['TYPE'] == UrlMetadataTable::TYPE_DYNAMIC) {
if ($preview = static::getDynamicPreview($metadata['URL'], $checkAccess)) {
$metadata['HTML'] = $preview;
return $metadata;
}
}
}
}
return false;
}
