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<?php
/**
* Elgg page handler functions
*
* @package Elgg.Core
* @subpackage Routing
*/
/**
* Routes the request to a registered page handler
*
* This function sets the context based on the handler name (first segment of the
* URL). It also triggers a plugin hook 'route', $handler so that plugins can
* modify the routing or handle a request.
*
* @param string $handler The name of the handler type (eg 'blog')
* @param array $page The parameters to the page, as an array (exploded by '/' slashes)
*
* @return bool
* @access private
*/
function page_handler($handler, $page) {
global $CONFIG;
elgg_set_context($handler);
$page = explode('/', $page);
// remove empty array element when page url ends in a / (see #1480)
if ($page[count($page) - 1] === '') {
array_pop($page);
}
// return false to stop processing the request (because you handled it)
// return a new $params array if you want to route the request differently
$params = array(
'handler' => $handler,
'segments' => $page,
);
$params = elgg_trigger_plugin_hook('route', $handler, NULL, $params);
if ($params === false) {
return true;
}
$handler = $params['handler'];
$page = $params['segments'];
$result = false;
if (isset($CONFIG->pagehandler) && !empty($handler) && isset($CONFIG->pagehandler[$handler])) {
$function = $CONFIG->pagehandler[$handler];
$result = call_user_func($function, $page, $handler);
}
return $result || headers_sent();
}
/**
* Registers a page handler for a particular identifier
*
* For example, you can register a function called 'blog_page_handler' for handler type 'blog'
* For all URLs http://yoururl/blog/*, the blog_page_handler() function will be called.
* The part of the URL marked with * above will be exploded on '/' characters and passed as an
* array to that function.
* For example, the URL http://yoururl/blog/username/friends/ would result in the call:
* blog_page_handler(array('username','friends'), blog);
*
* A request to register a page handler with the same identifier as previously registered
* handler will replace the previous one.
*
* The context is set to the page handler identifier before the registered
* page handler function is called. For the above example, the context is set to 'blog'.
*
* Page handlers should return true to indicate that they handled the request.
* Requests not handled are forwarded to the front page with a reason of 404.
* Plugins can register for the 'forward', '404' plugin hook. @see forward()
*
* @param string $handler The page type to handle
* @param string $function Your function name
*
* @return true|false Depending on success
*/
function elgg_register_page_handler($handler, $function) {
global $CONFIG;
if (!isset($CONFIG->pagehandler)) {
$CONFIG->pagehandler = array();
}
if (is_callable($function)) {
$CONFIG->pagehandler[$handler] = $function;
return true;
}
return false;
}
/**
* Unregister a page handler for an identifier
*
* Note: to replace a page handler, call elgg_register_page_handler()
*
* @param string $handler The page type identifier
*
* @since 1.7.2
* @return void
*/
function elgg_unregister_page_handler($handler) {
global $CONFIG;
if (!isset($CONFIG->pagehandler)) {
return;
}
unset($CONFIG->pagehandler[$handler]);
}
/**
* Serve an error page
*
* @todo not sending status codes yet
*
* @param string $hook The name of the hook
* @param string $type The type of the hook
* @param bool $result The current value of the hook
* @param array $params Parameters related to the hook
* @return void
*/
function elgg_error_page_handler($hook, $type, $result, $params) {
if (elgg_view_exists("errors/$type")) {
$content = elgg_view("errors/$type", $params);
} else {
$content = elgg_view("errors/default", $params);
}
$body = elgg_view_layout('error', array('content' => $content));
echo elgg_view_page($title, $body, 'error');
exit;
}
/**
* Initializes the page handler/routing system
*
* @return void
* @access private
*/
function page_handler_init() {
elgg_register_plugin_hook_handler('forward', '404', 'elgg_error_page_handler');
}
elgg_register_event_handler('init', 'system', 'page_handler_init');
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