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-rw-r--r--engine/lib/actions.php87
1 files changed, 86 insertions, 1 deletions
diff --git a/engine/lib/actions.php b/engine/lib/actions.php
index 63ddfcbfb..fef6004cc 100644
--- a/engine/lib/actions.php
+++ b/engine/lib/actions.php
@@ -351,4 +351,89 @@ function elgg_action_exist($action) {
global $CONFIG;
return (isset($CONFIG->actions[$action]) && file_exists($CONFIG->actions[$action]['file']));
-} \ No newline at end of file
+}
+
+/**
+ * Initialize some ajaxy actions features
+ */
+function actions_init()
+{
+ register_action('security/refreshtoken', TRUE);
+
+ elgg_view_register_simplecache('js/languages/en');
+
+ register_plugin_hook('action', 'all', 'ajax_action_hook');
+ register_plugin_hook('forward', 'all', 'ajax_forward_hook');
+}
+
+/**
+ * Checks whether the request was requested via ajax
+ *
+ * @return bool whether page was requested via ajax
+ */
+function elgg_is_xhr() {
+ return isset($_SERVER['HTTP_X_REQUESTED_WITH'])
+ && strtolower($_SERVER['HTTP_X_REQUESTED_WITH']) == 'xmlhttprequest';
+}
+
+/**
+ * Catch calls to forward() in ajax request and force an exit.
+ *
+ * Forces response is json of the following form:
+ * <pre>
+ * {
+ * "current_url": "the.url.we/were/coming/from",
+ * "forward_url": "the.url.we/were/going/to",
+ * "system_messages": {
+ * "messages": ["msg1", "msg2", ...],
+ * "errors": ["err1", "err2", ...]
+ * },
+ * "status": -1 //or 0 for success if there are no error messages present
+ * }
+ * </pre>
+ * where "system_messages" is all message registers at the point of forwarding
+ *
+ * @param string $hook
+ * @param string $type
+ * @param string $reason
+ * @param array $params
+ *
+ */
+function ajax_forward_hook($hook, $type, $reason, $params) {
+ if (elgg_is_xhr()) {
+ //grab any data echo'd in the action
+ $output = ob_get_clean();
+
+ //Avoid double-encoding in case data is json
+ $json = json_decode($output);
+ if (isset($json)) {
+ $params['output'] = $json;
+ } else {
+ $params['output'] = $output;
+ }
+
+ //Grab any system messages so we can inject them via ajax too
+ $params['system_messages'] = system_messages(NULL, "");
+
+ if (isset($params['system_messages']['errors'])) {
+ $params['status'] = -1;
+ } else {
+ $params['status'] = 0;
+ }
+
+ header("Content-type: application/json");
+ echo json_encode($params);
+ exit;
+ }
+}
+
+/**
+ * Buffer all output echo'd directly in the action for inclusion in the returned JSON.
+ */
+function ajax_action_hook() {
+ if (elgg_is_xhr()) {
+ ob_start();
+ }
+}
+
+register_elgg_event_handler('init', 'system', 'actions_init'); \ No newline at end of file