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+<?php
+/**
+ * Elgg subgroups plugin
+ *
+ * @package ElggSubgroups
+ *
+ * TODO:
+ * * ElggSubgroup class with getMetaContainerGUID() ?
+ * * Subgroup graphs
+ *
+ */
+
+elgg_register_event_handler('init', 'system', 'subgroups_init');
+
+/**
+ * Subgroups plugin initialization functions.
+ */
+function subgroups_init() {
+ // register a library of helper functions
+ elgg_register_library('elgg:subgroups', elgg_get_plugins_path() . 'subgroups/lib/subgroups.php');
+ // override groups library
+ elgg_register_library('elgg:groups', elgg_get_plugins_path() . 'subgroups/lib/groups.php');
+
+ // Register actions
+ $actions_path = elgg_get_plugins_path() . 'subgroups/actions/subgroups';
+ elgg_register_action("subgroups/add", $actions_path."/add.php");
+ elgg_register_action("subgroups/remove", $actions_path."/remove.php");
+
+ // Register page handler
+ elgg_register_page_handler('subgroups', 'subgroups_page_handler');
+
+ // Register pagesetup event handler
+ elgg_register_event_handler('pagesetup', 'system', 'subgroups_setup_sidebar_menus');
+
+ // Register unsetter container_guid handler
+ elgg_register_event_handler('update', 'group', 'subgroups_unset_group_container');
+
+ // Register an unrelate link to entity menu (max priority to run the last)
+ elgg_register_plugin_hook_handler('register', 'menu:entity', 'subgroups_menu_setup', 9999);
+
+ // Extend group fields
+ elgg_register_plugin_hook_handler('profile:fields', 'group', 'subgroups_add_container_field');
+
+ // Access permissions
+ elgg_register_plugin_hook_handler('access:collections:write', 'all', 'subgroups_read_acl_plugin_hook');
+
+ // Extending views
+ elgg_extend_view('groups/sidebar/members', 'groups/sidebar/subgroups', 300);
+ //TODO elgg_extend_view('groups/forum_latest', 'subgroups/frontpage');
+
+ // Extending CSS
+ elgg_extend_view('css/elements/components', 'groups/css/elements/components');
+
+ elgg_register_ajax_view('subgroups/groups_i_can_edit');
+
+ // Add group tool
+ add_group_tool_option('subgroups', elgg_echo('subgroups:in_frontpage'), false);
+ elgg_extend_view('groups/tool_latest', 'subgroups/group_module');
+}
+
+/**
+ * Configure the groups sidebar menu. Triggered on page setup
+ *
+ */
+function subgroups_setup_sidebar_menus() {
+
+ elgg_unregister_menu_item('page', 'groups:member');
+
+ // Get the page owner entity
+ $page_owner = elgg_get_page_owner_entity();
+
+ if (elgg_get_context() == 'group_profile' || elgg_get_context() == 'groups') {
+ if ($page_owner instanceof ElggGroup) {
+ if (elgg_is_logged_in() && $page_owner->canEdit() || elgg_is_admin_logged_in()) {
+ $url = elgg_get_site_url() . "subgroups/edit/{$page_owner->getGUID()}";
+ elgg_register_menu_item('page', array(
+ 'name' => 'subgroups',
+ 'text' => elgg_echo('subgroups:add'),
+ 'href' => $url,
+ ));
+ }
+ }
+ }
+}
+
+/**
+ * Dispatches subgroups pages.
+ * URLs take the form of
+ *
+ * Group view subgroups: subgroups/owner/<group_guid>
+ * Group manage subgroups: subgroups/manage/<group_guid>
+ *
+ * @param array $page
+ * @return NULL
+ */
+function subgroups_page_handler($page){
+ $pages_path = elgg_get_plugins_path() . "subgroups/pages";
+
+ switch($page[0]) {
+ case 'add':
+ case 'edit':
+ elgg_set_page_owner_guid($page[1]);
+ include($pages_path."/subgroups/edit.php");
+ break;
+ case 'owner':
+ elgg_set_page_owner_guid($page[1]);
+ include($pages_path."/subgroups/owner.php");
+ break;
+ case 'new':
+ $group = new ElggGroup((int)$page[1]);
+
+ if (!$group->guid) {
+ register_error(elgg_echo('error:default'));
+ return false;
+ }
+
+ elgg_load_library('elgg:groups');
+ $title = elgg_echo('subgroups:new:of', array($group->name));
+
+ elgg_push_breadcrumb(elgg_echo('groups'), "groups/all");
+ elgg_push_breadcrumb($group->name, $group->getURL());
+ elgg_push_breadcrumb(elgg_echo('subgroups:new'));
+
+ set_input('container_guid', $group->guid);
+
+ $body = elgg_view_layout('content', array(
+ 'content' => elgg_view('groups/edit'),
+ 'title' => $title,
+ 'filter' => '',
+ ));
+ echo elgg_view_page($title, $body);
+
+ break;
+ default:
+ return false;
+ }
+ return true;
+}
+
+function subgroups_menu_setup($hook, $type, $return, $params){
+
+ $group = elgg_get_page_owner_entity();
+ $othergroup = $params['entity'];
+
+ if($group instanceof ElggGroup && $group->canEdit() &&
+ $othergroup instanceof ElggGroup &&
+ elgg_in_context('subgroups')){
+
+ // Delete all previous links
+ $return = array();
+
+ $url = elgg_http_add_url_query_elements('action/subgroups/remove', array(
+ 'group' => $group->guid,
+ 'othergroup' => $othergroup->guid,
+ ));
+
+ $options = array(
+ 'name' => 'delete',
+ 'href' => $url,
+ 'text' => "<span class=\"elgg-icon elgg-icon-delete\"></span>",
+ 'confirm' => elgg_echo('deleteconfirm'),
+ 'text_encode' => false,
+ );
+ $return[] = ElggMenuItem::factory($options);
+ }
+ return $return;
+}
+
+/**
+ * Unset container guid when a group is created. Triggered on group save.
+ * Using SQL since event is triggered on save() function and we can't do
+ * call the function again.
+ *
+ */
+function subgroups_unset_group_container($event, $object_type, $entity) {
+ global $CONFIG;
+ if (!elgg_instanceof($entity->getContainerEntity(), 'group')) {
+ $query = "UPDATE {$CONFIG->dbprefix}entities set"
+ . " container_guid=0 where guid={$entity->guid}";
+ return !!(update_data($query));
+ }
+ return true;
+}
+
+function subgroups_add_container_field($hook, $type, $return, $params) {
+ $return['container_guid'] = 'hidden';
+ return $return;
+}
+
+/**
+ * Hook to listen to read access control requests and return parent groups.
+ */
+function subgroups_read_acl_plugin_hook($hook, $entity_type, $returnvalue, $params) {
+ $page_owner = elgg_get_page_owner_entity();
+ $user_guid = $params['user_id'];
+ $user = get_entity($user_guid);
+ if (!$user) {
+ return $returnvalue;
+ }
+
+ // only insert group access for current group
+ if ($page_owner instanceof ElggGroup) {
+ $parent_group = $page_owner->getContainerEntity();
+ while ($parent_group) {
+ $returnvalue[$parent_group->group_acl] = elgg_echo('groups:group') . ': ' . $parent_group->name;
+ $parent_group = $parent_group->getContainerEntity();
+ }
+ }
+
+ return $returnvalue;
+}