/**
* Verify the provided Flickr API key by calling Flickr's API
*
* @author Niall Kennedy
* @since 0.1
* @param string $api_key Flickr API key input into the settings field
* @return string $api_key Flickr API key, or blank if validation failed
*/
function flickr_settings_api_key_field_sanitize($api_key)
{
$api_key = trim($api_key);
if (empty($api_key) || !ctype_alnum($api_key)) {
return '';
}
if (!class_exists('FlickrRequest')) {
require_once dirname(__FILE__) . '/class.flickr.php';
}
if (FlickrRequest::validate_api_key($api_key) === true) {
return $api_key;
} else {
add_settings_error('flickr_api_key', 'flickr-api-key-invalid', __('Invalid Flickr API key: Flickr rejected the key.'));
return '';
}
}
/**
* Store multiple sizes available for the given photo identifier on Flickr
*
* @param FlickrRequest $request existing Flickr request if you would like to reuse
* @return FlickrRequest Flickr request object for reuse
*/
private function load_sizes($request = null)
{
if (is_null($request)) {
$request = new FlickrRequest();
}
$sizes = $request->get_photo_sizes($this->id);
if (is_wp_error($sizes) || empty($sizes)) {
return $sizes;
}
if (isset($sizes->size)) {
$sizes = $sizes->size;
} else {
return '';
}
$this->sizes = array();
foreach ($sizes as $size) {
if (isset($size->media) && $size->media === 'photo') {
$this->sizes[absint($size->width)] = array('height' => absint($size->height), 'url' => esc_url_raw($size->source, array('http', 'https')));
}
}
unset($sizes);
return $request;
}
