/**
* The {@link do_shortcode()} callback function.
*
* Attempts to convert a URL into embed HTML. Starts by checking the URL against the regex of the registered embed handlers.
* If none of the regex matches and it's enabled, then the URL will be given to the {@link nxt_oEmbed} class.
*
* @uses nxt_oembed_get()
* @uses nxt_parse_args()
* @uses nxt_embed_defaults()
* @uses nxt_Embed::maybe_make_link()
* @uses get_option()
* @uses current_user_can()
* @uses nxt_cache_get()
* @uses nxt_cache_set()
* @uses get_post_meta()
* @uses update_post_meta()
*
* @param array $attr Shortcode attributes.
* @param string $url The URL attempting to be embedded.
* @return string The embed HTML on success, otherwise the original URL.
*/
function shortcode($attr, $url = '')
{
global $post;
if (empty($url)) {
return '';
}
$rawattr = $attr;
$attr = nxt_parse_args($attr, nxt_embed_defaults());
// kses converts & into & and we need to undo this
// See http://core.trac.nxtclass.org/ticket/11311
$url = str_replace('&', '&', $url);
// Look for known internal handlers
ksort($this->handlers);
foreach ($this->handlers as $priority => $handlers) {
foreach ($handlers as $id => $handler) {
if (preg_match($handler['regex'], $url, $matches) && is_callable($handler['callback'])) {
if (false !== ($return = call_user_func($handler['callback'], $matches, $attr, $url, $rawattr))) {
return apply_filters('embed_handler_html', $return, $url, $attr);
}
}
}
}
$post_ID = !empty($post->ID) ? $post->ID : null;
if (!empty($this->post_ID)) {
// Potentially set by nxt_Embed::cache_oembed()
$post_ID = $this->post_ID;
}
// Unknown URL format. Let oEmbed have a go.
if ($post_ID) {
// Check for a cached result (stored in the post meta)
$cachekey = '_oembed_' . md5($url . serialize($attr));
if ($this->usecache) {
$cache = get_post_meta($post_ID, $cachekey, true);
// Failures are cached
if ('{{unknown}}' === $cache) {
return $this->maybe_make_link($url);
}
if (!empty($cache)) {
return apply_filters('embed_oembed_html', $cache, $url, $attr, $post_ID);
}
}
// Use oEmbed to get the HTML
$attr['discover'] = apply_filters('embed_oembed_discover', false) && author_can($post_ID, 'unfiltered_html');
$html = nxt_oembed_get($url, $attr);
// Cache the result
$cache = $html ? $html : '{{unknown}}';
update_post_meta($post_ID, $cachekey, $cache);
// If there was a result, return it
if ($html) {
return apply_filters('embed_oembed_html', $html, $url, $attr, $post_ID);
}
}
// Still unknown
return $this->maybe_make_link($url);
}
/**
* Base function so BP components / plugins can parse links to be embedded.
* View an example to add support in {@link bp_activity_embed()}.
*
* @uses apply_filters() Filters cache.
* @uses do_action() To save cache.
* @uses nxt_oembed_get() Connects to oEmbed provider and returns HTML on success.
* @uses nxt_Embed::maybe_make_link() Process URL for hyperlinking on oEmbed failure.
* @param int $id ID to do the caching for.
* @param string $url The URL attempting to be embedded.
* @param array $attr Shortcode attributes from {@link nxt_Embed::shortcode()}.
* @param array $rawattr Untouched shortcode attributes from {@link nxt_Embed::shortcode()}.
* @return string The embed HTML on success, otherwise the original URL.
*/
function parse_oembed($id, $url, $attr, $rawattr)
{
$id = intval($id);
if ($id) {
// Setup the cachekey
$cachekey = '_oembed_' . md5($url . serialize($attr));
// Let components / plugins grab their cache
$cache = '';
$cache = apply_filters('bp_embed_get_cache', $cache, $id, $cachekey, $url, $attr, $rawattr);
// Grab cache and return it if available
if (!empty($cache)) {
return apply_filters('bp_embed_oembed_html', $cache, $url, $attr, $rawattr);
// If no cache, ping the oEmbed provider and cache the result
} else {
$html = nxt_oembed_get($url, $attr);
$cache = $html ? $html : $url;
// Let components / plugins save their cache
do_action('bp_embed_update_cache', $cache, $cachekey, $id);
// If there was a result, return it
if ($html) {
return apply_filters('bp_embed_oembed_html', $html, $url, $attr, $rawattr);
}
}
}
// Still unknown
return $this->maybe_make_link($url);
}
