1 files changed, 72 insertions, 0 deletions
diff --git a/mod/groups/actions/groups/membership/join.php b/mod/groups/actions/groups/membership/join.php
new file mode 100644
index 000000000..b4f4e280c
--- /dev/null
+++ b/mod/groups/actions/groups/membership/join.php
@@ -0,0 +1,72 @@
+<?php
+/**
+ * Join a group
+ *
+ * Three states:
+ * open group so user joins
+ * closed group so request sent to group owner
+ * closed group with invite so user joins
+ * 
+ * @package ElggGroups
+ */
+
+global $CONFIG;
+
+$user_guid = get_input('user_guid', elgg_get_logged_in_user_guid());
+$group_guid = get_input('group_guid');
+
+$user = get_entity($user_guid);
+
+// access bypass for getting invisible group
+$ia = elgg_set_ignore_access(true);
+$group = get_entity($group_guid);
+elgg_set_ignore_access($ia);
+
+if (($user instanceof ElggUser) && ($group instanceof ElggGroup)) {
+
+	// join or request
+	$join = false;
+	if ($group->isPublicMembership() || $group->canEdit($user->guid)) {
+		// anyone can join public groups and admins can join any group
+		$join = true;
+	} else {
+		if (check_entity_relationship($group->guid, 'invited', $user->guid)) {
+			// user has invite to closed group
+			$join = true;
+		}
+	}
+
+	if ($join) {
+		if (groups_join_group($group, $user)) {
+			system_message(elgg_echo("groups:joined"));
+			forward($group->getURL());
+		} else {
+			register_error(elgg_echo("groups:cantjoin"));
+		}
+	} else {
+		add_entity_relationship($user->guid, 'membership_request', $group->guid);
+
+		// Notify group owner
+		$url = "{$CONFIG->url}groups/requests/$group->guid";
+		$subject = elgg_echo('groups:request:subject', array(
+			$user->name,
+			$group->name,
+		));
+		$body = elgg_echo('groups:request:body', array(
+			$group->getOwnerEntity()->name,
+			$user->name,
+			$group->name,
+			$user->getURL(),
+			$url,
+		));
+		if (notify_user($group->owner_guid, $user->getGUID(), $subject, $body)) {
+			system_message(elgg_echo("groups:joinrequestmade"));
+		} else {
+			register_error(elgg_echo("groups:joinrequestnotmade"));
+		}
+	}
+} else {
+	register_error(elgg_echo("groups:cantjoin"));
+}
+
+forward(REFERER);