diff options
Diffstat (limited to 'engine/lib/access.php')
| -rw-r--r-- | engine/lib/access.php | 992 |
1 files changed, 596 insertions, 396 deletions
diff --git a/engine/lib/access.php b/engine/lib/access.php index a626bae7e..de0693ea8 100644 --- a/engine/lib/access.php +++ b/engine/lib/access.php @@ -1,68 +1,62 @@ <?php /** - * Elgg access permissions - * For users, objects, collections and all metadata + * Functions for Elgg's access system for entities, metadata, and annotations. * - * @package Elgg - * @subpackage Core - - * @author Curverider Ltd - - * @link http://elgg.org/ + * Access is generally saved in the database as access_id. This corresponds to + * one of the ACCESS_* constants defined in {@link elgglib.php} or the ID of an + * access collection. + * + * @package Elgg.Core + * @subpackage Access + * @link http://docs.elgg.org/Access */ /** - * Temporary class used to determing if access is being ignored + * Return an ElggCache static variable cache for the access caches + * + * @staticvar ElggStaticVariableCache $access_cache + * @return \ElggStaticVariableCache + * @access private */ -class ElggAccess { +function _elgg_get_access_cache() { /** - * Bypass Elgg's access control if true. - * @var bool + * A default filestore cache using the dataroot. */ - private $ignore_access; + static $access_cache; - /** - * Get current ignore access setting. - * @return bool - */ - public function get_ignore_access() { - return $this->ignore_access; + if (!$access_cache) { + $access_cache = new ElggStaticVariableCache('access'); } - /** - * Set ignore access. - * - * @param $ignore bool true || false to ignore - * @return bool Previous setting - */ - public function set_ignore_access($ignore = true) { - $prev = $this->ignore_access; - $this->ignore_access = $ignore; - - return $prev; - } + return $access_cache; } - /** * Return a string of access_ids for $user_id appropriate for inserting into an SQL IN clause. * * @uses get_access_array - * @param int $user_id User ID; defaults to currently logged in user - * @param int $site_id Site ID; defaults to current site - * @param boolean $flush If set to true, will refresh the access list from the database - * @return string A list of access collections suitable for injection in an SQL call + * + * @link http://docs.elgg.org/Access + * @see get_access_array() + * + * @param int $user_id User ID; defaults to currently logged in user + * @param int $site_id Site ID; defaults to current site + * @param bool $flush If set to true, will refresh the access list from the + * database rather than using this function's cache. + * + * @return string A list of access collections suitable for using in an SQL call + * @access private */ function get_access_list($user_id = 0, $site_id = 0, $flush = false) { - global $CONFIG, $init_finished, $SESSION; - static $access_list; - - if (!isset($access_list) || !$init_finished) { - $access_list = array(); + global $CONFIG, $init_finished; + $cache = _elgg_get_access_cache(); + + if ($flush) { + $cache->clear(); } if ($user_id == 0) { - $user_id = $SESSION['id']; + $user_id = elgg_get_logged_in_user_guid(); } if (($site_id == 0) && (isset($CONFIG->site_id))) { @@ -71,36 +65,55 @@ function get_access_list($user_id = 0, $site_id = 0, $flush = false) { $user_id = (int) $user_id; $site_id = (int) $site_id; - if (isset($access_list[$user_id])) { - return $access_list[$user_id]; - } + $hash = $user_id . $site_id . 'get_access_list'; - $access_list[$user_id] = "(" . implode(",", get_access_array($user_id, $site_id, $flush)) . ")"; + if ($cache[$hash]) { + return $cache[$hash]; + } + + $access_array = get_access_array($user_id, $site_id, $flush); + $access = "(" . implode(",", $access_array) . ")"; - return $access_list[$user_id]; + if ($init_finished) { + $cache[$hash] = $access; + } + + return $access; } /** - * Gets an array of access restrictions the given user is allowed to see on this site + * Returns an array of access IDs a user is permitted to see. + * + * Can be overridden with the 'access:collections:read', 'user' plugin hook. + * + * This returns a list of all the collection ids a user owns or belongs + * to plus public and logged in access levels. If the user is an admin, it includes + * the private access level. + * + * @internal this is only used in core for creating the SQL where clause when + * retrieving content from the database. The friends access level is handled by + * get_access_sql_suffix(). * - * @param int $user_id User ID; defaults to currently logged in user - * @param int $site_id Site ID; defaults to current site - * @param boolean $flush If set to true, will refresh the access list from the database - * @return array An array of access collections suitable for injection in an SQL call + * @see get_write_access_array() for the access levels that a user can write to. + * + * @param int $user_id User ID; defaults to currently logged in user + * @param int $site_id Site ID; defaults to current site + * @param bool $flush If set to true, will refresh the access ids from the + * database rather than using this function's cache. + * + * @return array An array of access collections ids */ function get_access_array($user_id = 0, $site_id = 0, $flush = false) { global $CONFIG, $init_finished; - // @todo everything from the db is cached. - // this cache might be redundant. - static $access_array; + $cache = _elgg_get_access_cache(); - if (!isset($access_array) || (!isset($init_finished)) || (!$init_finished)) { - $access_array = array(); + if ($flush) { + $cache->clear(); } if ($user_id == 0) { - $user_id = get_loggedin_userid(); + $user_id = elgg_get_logged_in_user_guid(); } if (($site_id == 0) && (isset($CONFIG->site_guid))) { @@ -110,34 +123,41 @@ function get_access_array($user_id = 0, $site_id = 0, $flush = false) { $user_id = (int) $user_id; $site_id = (int) $site_id; - if (empty($access_array[$user_id]) || $flush == true) { - $tmp_access_array = array(ACCESS_PUBLIC); - if (isloggedin()) { - $tmp_access_array[] = ACCESS_LOGGED_IN; + $hash = $user_id . $site_id . 'get_access_array'; - // The following can only return sensible data if the user is logged in. + if ($cache[$hash]) { + $access_array = $cache[$hash]; + } else { + $access_array = array(ACCESS_PUBLIC); - // Get ACL memberships - $query = "SELECT am.access_collection_id FROM {$CONFIG->dbprefix}access_collection_membership am "; - $query .= " LEFT JOIN {$CONFIG->dbprefix}access_collections ag ON ag.id = am.access_collection_id "; - $query .= " WHERE am.user_guid = {$user_id} AND (ag.site_guid = {$site_id} OR ag.site_guid = 0)"; + // The following can only return sensible data if the user is logged in. + if (elgg_is_logged_in()) { + $access_array[] = ACCESS_LOGGED_IN; - if ($collections = get_data($query)) { - foreach($collections as $collection) { + // Get ACL memberships + $query = "SELECT am.access_collection_id" + . " FROM {$CONFIG->dbprefix}access_collection_membership am" + . " LEFT JOIN {$CONFIG->dbprefix}access_collections ag ON ag.id = am.access_collection_id" + . " WHERE am.user_guid = $user_id AND (ag.site_guid = $site_id OR ag.site_guid = 0)"; + + $collections = get_data($query); + if ($collections) { + foreach ($collections as $collection) { if (!empty($collection->access_collection_id)) { - $tmp_access_array[] = $collection->access_collection_id; + $access_array[] = (int)$collection->access_collection_id; } } } // Get ACLs owned. - $query = "SELECT ag.id FROM {$CONFIG->dbprefix}access_collections ag "; - $query .= " WHERE ag.owner_guid = {$user_id} AND (ag.site_guid = {$site_id} OR ag.site_guid = 0)"; + $query = "SELECT ag.id FROM {$CONFIG->dbprefix}access_collections ag "; + $query .= "WHERE ag.owner_guid = $user_id AND (ag.site_guid = $site_id OR ag.site_guid = 0)"; - if ($collections = get_data($query)) { - foreach($collections as $collection) { + $collections = get_data($query); + if ($collections) { + foreach ($collections as $collection) { if (!empty($collection->id)) { - $tmp_access_array[] = $collection->id; + $access_array[] = (int)$collection->id; } } } @@ -145,26 +165,32 @@ function get_access_array($user_id = 0, $site_id = 0, $flush = false) { $ignore_access = elgg_check_access_overrides($user_id); if ($ignore_access == true) { - $tmp_access_array[] = ACCESS_PRIVATE; + $access_array[] = ACCESS_PRIVATE; } - - $access_array[$user_id] = $tmp_access_array; - } else { - // No user id logged in so we can only access public info - $tmp_return = $tmp_access_array; } - } else { - $tmp_access_array = $access_array[$user_id]; + if ($init_finished) { + $cache[$hash] = $access_array; + } } - return trigger_plugin_hook('access:collections:read','user',array('user_id' => $user_id, 'site_id' => $site_id),$tmp_access_array); + $options = array( + 'user_id' => $user_id, + 'site_id' => $site_id + ); + + return elgg_trigger_plugin_hook('access:collections:read', 'user', $options, $access_array); } /** - * Gets the default access permission for new content + * Gets the default access permission. + * + * This returns the default access level for the site or optionally for the user. + * + * @param ElggUser $user Get the user's default access. Defaults to logged in user. * * @return int default access id (see ACCESS defines in elgglib.php) + * @link http://docs.elgg.org/Access */ function get_default_access(ElggUser $user = null) { global $CONFIG; @@ -173,7 +199,7 @@ function get_default_access(ElggUser $user = null) { return $CONFIG->default_access; } - if (!($user) || (!$user = get_loggedin_user())) { + if (!($user) && (!$user = elgg_get_logged_in_user_entity())) { return $CONFIG->default_access; } @@ -185,17 +211,20 @@ function get_default_access(ElggUser $user = null) { } /** - * Override the default behaviour and allow results to show hidden entities as well. - * THIS IS A HACK. + * Allow disabled entities and metadata to be returned by getter functions * - * TODO: Replace this with query object! + * @todo Replace this with query object! + * @global bool $ENTITY_SHOW_HIDDEN_OVERRIDE + * @access private */ $ENTITY_SHOW_HIDDEN_OVERRIDE = false; /** - * This will be replaced. Do not use in plugins! + * Show or hide disabled entities. * - * @param bool $show + * @param bool $show_hidden Show disabled entities. + * @return void + * @access private */ function access_show_hidden_entities($show_hidden) { global $ENTITY_SHOW_HIDDEN_OVERRIDE; @@ -203,7 +232,10 @@ function access_show_hidden_entities($show_hidden) { } /** - * This will be replaced. Do not use in plugins! + * Return current status of showing disabled entities. + * + * @return bool + * @access private */ function access_get_show_hidden_status() { global $ENTITY_SHOW_HIDDEN_OVERRIDE; @@ -211,45 +243,17 @@ function access_get_show_hidden_status() { } /** - * Add annotation restriction - * - * Returns an SQL fragment that is true (or optionally false) if the given user has - * added an annotation with the given name to the given entity. + * Returns the SQL where clause for a table with a access_id and enabled columns. * - * TODO: This is fairly generic so perhaps it could be moved to annotations.php - * - * @param string $annotation_name name of the annotation - * @param string $entity_guid SQL string that evaluates to the GUID of the entity the annotation should be attached to - * @param string $owner_guid SQL string that evaluates to the GUID of the owner of the annotation * - * @param boolean $exists If set to true, will return true if the annotation exists, otherwise returns false - * @return string An SQL fragment suitable for inserting into a WHERE clause - */ -function get_annotation_sql($annotation_name, $entity_guid, $owner_guid, $exists) { - global $CONFIG; - - if ($exists) { - $not = ''; - } else { - $not = 'NOT'; - } - - $sql = <<<END -$not EXISTS (SELECT * FROM {$CONFIG->dbprefix}annotations a -INNER JOIN {$CONFIG->dbprefix}metastrings ms ON (a.name_id = ms.id) -WHERE ms.string = '$annotation_name' -AND a.entity_guid = $entity_guid -AND a.owner_guid = $owner_guid) -END; - return $sql; -} - -/** - * Add access restriction sql code to a given query. - * Note that if this code is executed in privileged mode it will return blank. - * @TODO: DELETE once Query classes are fully integrated + * This handles returning where clauses for ACCESS_FRIENDS and the currently + * unused block and filter lists in addition to using get_access_list() for + * access collections and the standard access levels. * * @param string $table_prefix Optional table. prefix for the access code. - * @param int $owner + * @param int $owner The guid to check access for. Defaults to logged in user. + * + * @return string The SQL for a where clause + * @access private */ function get_access_sql_suffix($table_prefix = '', $owner = null) { global $ENTITY_SHOW_HIDDEN_OVERRIDE, $CONFIG; @@ -259,11 +263,11 @@ function get_access_sql_suffix($table_prefix = '', $owner = null) { $enemies_bit = ""; if ($table_prefix) { - $table_prefix = sanitise_string($table_prefix) . "."; + $table_prefix = sanitise_string($table_prefix) . "."; } if (!isset($owner)) { - $owner = get_loggedin_userid(); + $owner = elgg_get_logged_in_user_guid(); } if (!$owner) { @@ -276,22 +280,24 @@ function get_access_sql_suffix($table_prefix = '', $owner = null) { if ($ignore_access) { $sql = " (1 = 1) "; } else if ($owner != -1) { + // we have an entity's guid and auto check for friend relationships $friends_bit = "{$table_prefix}access_id = " . ACCESS_FRIENDS . " AND {$table_prefix}owner_guid IN ( SELECT guid_one FROM {$CONFIG->dbprefix}entity_relationships WHERE relationship='friend' AND guid_two=$owner )"; - $friends_bit = '('.$friends_bit.') OR '; + $friends_bit = '(' . $friends_bit . ') OR '; + // @todo untested and unsupported at present if ((isset($CONFIG->user_block_and_filter_enabled)) && ($CONFIG->user_block_and_filter_enabled)) { // check to see if the user is in the entity owner's block list // or if the entity owner is in the user's filter list // if so, disallow access - $enemies_bit = get_annotation_sql('elgg_block_list', "{$table_prefix}owner_guid", $owner, false); + $enemies_bit = get_access_restriction_sql('elgg_block_list', "{$table_prefix}owner_guid", $owner, false); $enemies_bit = '(' . $enemies_bit - . ' AND ' . get_annotation_sql('elgg_filter_list', $owner, "{$table_prefix}owner_guid", false) + . ' AND ' . get_access_restriction_sql('elgg_filter_list', $owner, "{$table_prefix}owner_guid", false) . ')'; } } @@ -310,18 +316,68 @@ function get_access_sql_suffix($table_prefix = '', $owner = null) { $sql = "$enemies_bit AND ($sql)"; } - if (!$ENTITY_SHOW_HIDDEN_OVERRIDE) + if (!$ENTITY_SHOW_HIDDEN_OVERRIDE) { $sql .= " and {$table_prefix}enabled='yes'"; - return '('.$sql.')'; + } + + return '(' . $sql . ')'; } /** - * Determines whether the given user has access to the given entity + * Get the where clause for an access restriction based on annotations + * + * Returns an SQL fragment that is true (or optionally false) if the given user has + * added an annotation with the given name to the given entity. + * + * @warning this is a private function for an untested capability and will likely + * be removed from a future version of Elgg. + * + * @param string $annotation_name Name of the annotation + * @param string $entity_guid SQL GUID of entity the annotation is attached to. + * @param string $owner_guid SQL string that evaluates to the GUID of the annotation owner + * @param boolean $exists If true, returns BOOL if the annotation exists + * + * @return string An SQL fragment suitable for inserting into a WHERE clause + * @access private + */ +function get_access_restriction_sql($annotation_name, $entity_guid, $owner_guid, $exists) { + global $CONFIG; + + if ($exists) { + $not = ''; + } else { + $not = 'NOT'; + } + + $sql = <<<END +$not EXISTS (SELECT * FROM {$CONFIG->dbprefix}annotations a +INNER JOIN {$CONFIG->dbprefix}metastrings ms ON (a.name_id = ms.id) +WHERE ms.string = '$annotation_name' +AND a.entity_guid = $entity_guid +AND a.owner_guid = $owner_guid) +END; + return $sql; +} + +/** + * Can a user access an entity. + * + * @warning If a logged in user doesn't have access to an entity, the + * core engine will not load that entity. + * + * @tip This is mostly useful for checking if a user other than the logged in + * user has access to an entity that is currently loaded. + * + * @todo This function would be much more useful if we could pass the guid of the + * entity to test access for. We need to be able to tell whether the entity exists + * and whether the user has access to the entity. * * @param ElggEntity $entity The entity to check access for. - * @param ElggUser $user Optionally the user to check access for. + * @param ElggUser $user Optionally user to check access for. Defaults to + * logged in user (which is a useless default). * - * @return boolean True if the user can access the entity + * @return bool + * @link http://docs.elgg.org/Access */ function has_access_to_entity($entity, $user = null) { global $CONFIG; @@ -333,7 +389,8 @@ function has_access_to_entity($entity, $user = null) { } $query = "SELECT guid from {$CONFIG->dbprefix}entities e WHERE e.guid = " . $entity->getGUID(); - $query .= " AND " . $access_bit; // Add access controls + // Add access controls + $query .= " AND " . $access_bit; if (get_data($query)) { return true; } else { @@ -342,22 +399,41 @@ function has_access_to_entity($entity, $user = null) { } /** - * Returns an array of access permissions that the specified user is allowed to save objects with. - * Permissions are of the form ('id' => 'Description') + * Returns an array of access permissions that the user is allowed to save content with. + * Permissions returned are of the form (id => 'name'). + * + * Example return value in English: + * array( + * 0 => 'Private', + * -2 => 'Friends', + * 1 => 'Logged in users', + * 2 => 'Public', + * 34 => 'My favorite friends', + * ); + * + * Plugin hook of 'access:collections:write', 'user' + * + * @warning this only returns access collections that the user owns plus the + * standard access levels. It does not return access collections that the user + * belongs to such as the access collection for a group. * - * @param int $user_id The user's GUID. - * @param int $site_id The current site. - * @param true|false $flush If this is set to true, this will shun any cached version + * @param int $user_id The user's GUID. + * @param int $site_id The current site. + * @param bool $flush If this is set to true, this will ignore a cached access array * * @return array List of access permissions + * @link http://docs.elgg.org/Access */ function get_write_access_array($user_id = 0, $site_id = 0, $flush = false) { - global $CONFIG; - //@todo this is probably not needed since caching happens at the DB level. - static $access_array; + global $CONFIG, $init_finished; + $cache = _elgg_get_access_cache(); + + if ($flush) { + $cache->clear(); + } if ($user_id == 0) { - $user_id = get_loggedin_userid(); + $user_id = elgg_get_logged_in_user_guid(); } if (($site_id == 0) && (isset($CONFIG->site_id))) { @@ -367,40 +443,99 @@ function get_write_access_array($user_id = 0, $site_id = 0, $flush = false) { $user_id = (int) $user_id; $site_id = (int) $site_id; - if (empty($access_array[$user_id]) || $flush == true) { + $hash = $user_id . $site_id . 'get_write_access_array'; + + if ($cache[$hash]) { + $access_array = $cache[$hash]; + } else { + // @todo is there such a thing as public write access? + $access_array = array( + ACCESS_PRIVATE => elgg_echo("PRIVATE"), + ACCESS_FRIENDS => elgg_echo("access:friends:label"), + ACCESS_LOGGED_IN => elgg_echo("LOGGED_IN"), + ACCESS_PUBLIC => elgg_echo("PUBLIC") + ); + $query = "SELECT ag.* FROM {$CONFIG->dbprefix}access_collections ag "; - $query .= " WHERE (ag.site_guid = {$site_id} OR ag.site_guid = 0)"; - $query .= " AND (ag.owner_guid = {$user_id})"; - $query .= " AND ag.id >= 3"; - - $tmp_access_array = array( ACCESS_PRIVATE => elgg_echo("PRIVATE"), - ACCESS_FRIENDS => elgg_echo("access:friends:label"), - ACCESS_LOGGED_IN => elgg_echo("LOGGED_IN"), - ACCESS_PUBLIC => elgg_echo("PUBLIC")); - if ($collections = get_data($query)) { - foreach($collections as $collection) { - $tmp_access_array[$collection->id] = $collection->name; + $query .= " WHERE (ag.site_guid = $site_id OR ag.site_guid = 0)"; + $query .= " AND (ag.owner_guid = $user_id)"; + + $collections = get_data($query); + if ($collections) { + foreach ($collections as $collection) { + $access_array[$collection->id] = $collection->name; } } - $access_array[$user_id] = $tmp_access_array; + if ($init_finished) { + $cache[$hash] = $access_array; + } + } + + $options = array( + 'user_id' => $user_id, + 'site_id' => $site_id + ); + return elgg_trigger_plugin_hook('access:collections:write', 'user', + $options, $access_array); +} + +/** + * Can the user change this access collection? + * + * Use the plugin hook of 'access:collections:write', 'user' to change this. + * @see get_write_access_array() for details on the hook. + * + * Respects access control disabling for admin users and {@see elgg_set_ignore_access()} + * + * @see get_write_access_array() + * + * @param int $collection_id The collection id + * @param mixed $user_guid The user GUID to check for. Defaults to logged in user. + * @return bool + */ +function can_edit_access_collection($collection_id, $user_guid = null) { + if ($user_guid) { + $user = get_entity((int) $user_guid); } else { - $tmp_access_array = $access_array[$user_id]; + $user = elgg_get_logged_in_user_entity(); } - $tmp_access_array = trigger_plugin_hook('access:collections:write','user',array('user_id' => $user_id, 'site_id' => $site_id),$tmp_access_array); + $collection = get_access_collection($collection_id); - return $tmp_access_array; + if (!($user instanceof ElggUser) || !$collection) { + return false; + } + + $write_access = get_write_access_array($user->getGUID(), 0, true); + + // don't ignore access when checking users. + if ($user_guid) { + return array_key_exists($collection_id, $write_access); + } else { + return elgg_get_ignore_access() || array_key_exists($collection_id, $write_access); + } } /** - * Creates a new access control collection owned by the specified user. + * Creates a new access collection. + * + * Access colletions allow plugins and users to create granular access + * for entities. + * + * Triggers plugin hook 'access:collections:addcollection', 'collection' * - * @param string $name The name of the collection. - * @param int $owner_guid The GUID of the owner (default: currently logged in user). - * @param int $site_guid The GUID of the site (default: current site). + * @internal Access collections are stored in the access_collections table. + * Memberships to collections are in access_collections_membership. * - * @return int|false Depending on success (the collection ID if successful). + * @param string $name The name of the collection. + * @param int $owner_guid The GUID of the owner (default: currently logged in user). + * @param int $site_guid The GUID of the site (default: current site). + * + * @return int|false The collection ID if successful and false on failure. + * @link http://docs.elgg.org/Access/Collections + * @see update_access_collection() + * @see delete_access_collection() */ function create_access_collection($name, $owner_guid = 0, $site_guid = 0) { global $CONFIG; @@ -411,7 +546,7 @@ function create_access_collection($name, $owner_guid = 0, $site_guid = 0) { } if ($owner_guid == 0) { - $owner_guid = get_loggedin_userid(); + $owner_guid = elgg_get_logged_in_user_guid(); } if (($site_guid == 0) && (isset($CONFIG->site_guid))) { $site_guid = $CONFIG->site_guid; @@ -422,7 +557,8 @@ function create_access_collection($name, $owner_guid = 0, $site_guid = 0) { SET name = '{$name}', owner_guid = {$owner_guid}, site_guid = {$site_guid}"; - if (!$id = insert_data($q)) { + $id = insert_data($q); + if (!$id) { return false; } @@ -430,7 +566,7 @@ function create_access_collection($name, $owner_guid = 0, $site_guid = 0) { 'collection_id' => $id ); - if (!trigger_plugin_hook('access:collections:addcollection', 'collection', $params, true)) { + if (!elgg_trigger_plugin_hook('access:collections:addcollection', 'collection', $params, true)) { return false; } @@ -440,195 +576,245 @@ function create_access_collection($name, $owner_guid = 0, $site_guid = 0) { /** * Updates the membership in an access collection. * - * @param int $collection_id The ID of the collection. - * @param array $members Array of member GUIDs - * @return true|false Depending on success + * @warning Expects a full list of all members that should + * be part of the access collection + * + * @note This will run all hooks associated with adding or removing + * members to access collections. + * + * @param int $collection_id The ID of the collection. + * @param array $members Array of member GUIDs + * + * @return bool + * @link http://docs.elgg.org/Access/Collections + * @see add_user_to_access_collection() + * @see remove_user_from_access_collection() */ function update_access_collection($collection_id, $members) { - global $CONFIG; + $acl = get_access_collection($collection_id); - $collection_id = (int) $collection_id; + if (!$acl) { + return false; + } $members = (is_array($members)) ? $members : array(); - $collections = get_write_access_array(); - - if (array_key_exists($collection_id, $collections)) { - $cur_members = get_members_of_access_collection($collection_id, true); - $cur_members = (is_array($cur_members)) ? $cur_members : array(); + $cur_members = get_members_of_access_collection($collection_id, true); + $cur_members = (is_array($cur_members)) ? $cur_members : array(); - $remove_members = array_diff($cur_members, $members); - $add_members = array_diff($members, $cur_members); + $remove_members = array_diff($cur_members, $members); + $add_members = array_diff($members, $cur_members); - $params = array( - 'collection_id' => $collection_id, - 'members' => $members, - 'add_members' => $add_members, - 'remove_members' => $remove_members - ); - - foreach ($add_members as $guid) { - add_user_to_access_collection($guid, $collection_id); - } + $result = true; - foreach ($remove_members as $guid) { - remove_user_from_access_collection($guid, $collection_id); - } + foreach ($add_members as $guid) { + $result = $result && add_user_to_access_collection($guid, $collection_id); + } - return true; + foreach ($remove_members as $guid) { + $result = $result && remove_user_from_access_collection($guid, $collection_id); } - return false; + return $result; } /** - * Deletes a specified access collection + * Deletes a specified access collection and its membership. * * @param int $collection_id The collection ID - * @return true|false Depending on success + * + * @return bool + * @link http://docs.elgg.org/Access/Collections + * @see create_access_collection() + * @see update_access_collection() */ function delete_access_collection($collection_id) { + global $CONFIG; $collection_id = (int) $collection_id; - $collections = get_write_access_array(null, null, TRUE); $params = array('collection_id' => $collection_id); - if (!trigger_plugin_hook('access:collections:deletecollection', 'collection', $params, true)) { + if (!elgg_trigger_plugin_hook('access:collections:deletecollection', 'collection', $params, true)) { return false; } - if (array_key_exists($collection_id, $collections)) { - global $CONFIG; - delete_data("delete from {$CONFIG->dbprefix}access_collection_membership where access_collection_id = {$collection_id}"); - delete_data("delete from {$CONFIG->dbprefix}access_collections where id = {$collection_id}"); - return true; - } else { - return false; - } + // Deleting membership doesn't affect result of deleting ACL. + $q = "DELETE FROM {$CONFIG->dbprefix}access_collection_membership + WHERE access_collection_id = {$collection_id}"; + delete_data($q); + $q = "DELETE FROM {$CONFIG->dbprefix}access_collections + WHERE id = {$collection_id}"; + $result = delete_data($q); + + return (bool)$result; } /** * Get a specified access collection * + * @note This doesn't return the members of an access collection, + * just the database row of the actual collection. + * + * @see get_members_of_access_collection() + * * @param int $collection_id The collection ID - * @return array|false Depending on success + * + * @return object|false */ function get_access_collection($collection_id) { global $CONFIG; $collection_id = (int) $collection_id; - $get_collection = get_data_row("SELECT * FROM {$CONFIG->dbprefix}access_collections WHERE id = {$collection_id}"); + $query = "SELECT * FROM {$CONFIG->dbprefix}access_collections WHERE id = {$collection_id}"; + $get_collection = get_data_row($query); return $get_collection; } /** - * Adds a user to the specified user collection + * Adds a user to an access collection. * - * @param int $user_guid The GUID of the user to add + * Triggers the 'access:collections:add_user', 'collection' plugin hook. + * + * @param int $user_guid The GUID of the user to add * @param int $collection_id The ID of the collection to add them to - * @return true|false Depending on success + * + * @return bool + * @see update_access_collection() + * @see remove_user_from_access_collection() + * @link http://docs.elgg.org/Access/Collections */ function add_user_to_access_collection($user_guid, $collection_id) { + global $CONFIG; + $collection_id = (int) $collection_id; $user_guid = (int) $user_guid; - $collections = get_write_access_array(); - - if (!($collection = get_access_collection($collection_id))) - return false; - - if ((array_key_exists($collection_id, $collections) || $collection->owner_guid == 0) - && $user = get_user($user_guid)) { - global $CONFIG; + $user = get_user($user_guid); - $params = array( - 'collection_id' => $collection_id, - 'user_guid' => $user_guid - ); + $collection = get_access_collection($collection_id); - if (!trigger_plugin_hook('access:collections:add_user', 'collection', $params, true)) { - return false; - } + if (!($user instanceof Elgguser) || !$collection) { + return false; + } - try { - insert_data("insert into {$CONFIG->dbprefix}access_collection_membership set access_collection_id = {$collection_id}, user_guid = {$user_guid}"); - } catch (DatabaseException $e) { - // nothing. - } - return true; + $params = array( + 'collection_id' => $collection_id, + 'user_guid' => $user_guid + ); + $result = elgg_trigger_plugin_hook('access:collections:add_user', 'collection', $params, true); + if ($result == false) { + return false; } - return false; + // if someone tries to insert the same data twice, we do a no-op on duplicate key + $q = "INSERT INTO {$CONFIG->dbprefix}access_collection_membership + SET access_collection_id = $collection_id, user_guid = $user_guid + ON DUPLICATE KEY UPDATE user_guid = user_guid"; + $result = insert_data($q); + + return $result !== false; } /** - * Removes a user from an access collection + * Removes a user from an access collection. + * + * Triggers the 'access:collections:remove_user', 'collection' plugin hook. * - * @param int $user_guid The user GUID + * @param int $user_guid The user GUID * @param int $collection_id The access collection ID - * @return true|false Depending on success + * + * @return bool + * @see update_access_collection() + * @see remove_user_from_access_collection() + * @link http://docs.elgg.org/Access/Collections */ function remove_user_from_access_collection($user_guid, $collection_id) { + global $CONFIG; + $collection_id = (int) $collection_id; $user_guid = (int) $user_guid; - $collections = get_write_access_array(); + $user = get_user($user_guid); - if (!($collection = get_access_collection($collection_id))) - return false; - - if ((array_key_exists($collection_id, $collections) || $collection->owner_guid == 0) && $user = get_user($user_guid)) { - global $CONFIG; - $params = array( - 'collection_id' => $collection_id, - 'user_guid' => $user_guid - ); + $collection = get_access_collection($collection_id); - if (!trigger_plugin_hook('access:collections:remove_user', 'collection', $params, true)) { - return false; - } + if (!($user instanceof Elgguser) || !$collection) { + return false; + } - delete_data("delete from {$CONFIG->dbprefix}access_collection_membership where access_collection_id = {$collection_id} and user_guid = {$user_guid}"); - return true; + $params = array( + 'collection_id' => $collection_id, + 'user_guid' => $user_guid + ); + if (!elgg_trigger_plugin_hook('access:collections:remove_user', 'collection', $params, true)) { + return false; } - return false; + $q = "DELETE FROM {$CONFIG->dbprefix}access_collection_membership + WHERE access_collection_id = {$collection_id} + AND user_guid = {$user_guid}"; + + return (bool)delete_data($q); } /** - * Get all of a users collections + * Returns an array of database row objects of the access collections owned by $owner_guid. + * + * @param int $owner_guid The entity guid + * @param int $site_guid The GUID of the site (default: current site). * - * @param int $owner_guid The user ID - * @return true|false Depending on success + * @return array|false + * @see add_access_collection() + * @see get_members_of_access_collection() + * @link http://docs.elgg.org/Access/Collections */ -function get_user_access_collections($owner_guid) { +function get_user_access_collections($owner_guid, $site_guid = 0) { global $CONFIG; $owner_guid = (int) $owner_guid; + $site_guid = (int) $site_guid; + + if (($site_guid == 0) && (isset($CONFIG->site_guid))) { + $site_guid = $CONFIG->site_guid; + } - $collections = get_data("SELECT * FROM {$CONFIG->dbprefix}access_collections WHERE owner_guid = {$owner_guid}"); + $query = "SELECT * FROM {$CONFIG->dbprefix}access_collections + WHERE owner_guid = {$owner_guid} + AND site_guid = {$site_guid}"; + + $collections = get_data($query); return $collections; } /** - * Get all of members of a friend collection + * Get all of members of an access collection + * + * @param int $collection The collection's ID + * @param bool $idonly If set to true, will only return the members' GUIDs (default: false) * - * @param int $collection The collection's ID - * @param true|false $idonly If set to true, will only return the members' IDs (default: false) - * @return ElggUser entities if successful, false if not + * @return array ElggUser guids or entities if successful, false if not + * @see add_user_to_access_collection() + * @see http://docs.elgg.org/Access/Collections */ -function get_members_of_access_collection($collection, $idonly = false) { +function get_members_of_access_collection($collection, $idonly = FALSE) { global $CONFIG; $collection = (int)$collection; if (!$idonly) { - $query = "SELECT e.* FROM {$CONFIG->dbprefix}access_collection_membership m JOIN {$CONFIG->dbprefix}entities e ON e.guid = m.user_guid WHERE m.access_collection_id = {$collection}"; + $query = "SELECT e.* FROM {$CONFIG->dbprefix}access_collection_membership m" + . " JOIN {$CONFIG->dbprefix}entities e ON e.guid = m.user_guid" + . " WHERE m.access_collection_id = {$collection}"; $collection_members = get_data($query, "entity_row_to_elggstar"); } else { - $query = "SELECT e.guid FROM {$CONFIG->dbprefix}access_collection_membership m JOIN {$CONFIG->dbprefix}entities e ON e.guid = m.user_guid WHERE m.access_collection_id = {$collection}"; + $query = "SELECT e.guid FROM {$CONFIG->dbprefix}access_collection_membership m" + . " JOIN {$CONFIG->dbprefix}entities e ON e.guid = m.user_guid" + . " WHERE m.access_collection_id = {$collection}"; $collection_members = get_data($query); - foreach($collection_members as $key => $val) { + if (!$collection_members) { + return FALSE; + } + foreach ($collection_members as $key => $val) { $collection_members[$key] = $val->guid; } } @@ -637,93 +823,16 @@ function get_members_of_access_collection($collection, $idonly = false) { } /** - * Displays a user's access collections, using the friends/collections view - * - * @param int $owner_guid The GUID of the owning user - * @return string A formatted rendition of the collections - */ -function elgg_view_access_collections($owner_guid) { - if ($collections = get_user_access_collections($owner_guid)) { - foreach($collections as $key => $collection) { - $collections[$key]->members = get_members_of_access_collection($collection->id, true); - $collections[$key]->entities = get_user_friends($owner_guid,"",9999); - } - } - - return elgg_view('friends/collections',array('collections' => $collections)); -} - -/** - * Get entities with the specified access collection id. + * Return entities based upon access id. * - * @deprecated 1.7. Use elgg_get_entities_from_access_id() + * @param array $options Any options accepted by {@link elgg_get_entities()} and + * access_id => int The access ID of the entity. * - * @param $collection_id - * @param $entity_type - * @param $entity_subtype - * @param $owner_guid - * @param $limit - * @param $offset - * @param $order_by - * @param $site_guid - * @param $count - * @return unknown_type + * @see elgg_get_entities() + * @return mixed If count, int. If not count, array. false on errors. + * @since 1.7.0 */ -function get_entities_from_access_id($collection_id, $entity_type = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $offset = 0, $order_by = "", $site_guid = 0, $count = false) { - // log deprecated warning - elgg_deprecated_notice('get_entities_from_access_id() was deprecated by elgg_get_entities()!', 1.7); - - if (!$collection_id) { - return FALSE; - } - - // build the options using given parameters - $options = array(); - $options['limit'] = $limit; - $options['offset'] = $offset; - $options['count'] = $count; - - if ($entity_type) { - $options['type'] = sanitise_string($entity_type); - } - - if ($entity_subtype) { - $options['subtype'] = $entity_subtype; - } - - if ($site_guid) { - $options['site_guid'] = $site_guid; - } - - if ($order_by) { - $options['order_by'] = sanitise_string("e.time_created, $order_by"); - } - - if ((is_array($owner_guid) && (count($owner_guid)))) { - $options['owner_guids'] = array(); - foreach($owner_guid as $guid) { - $options['owner_guids'][] = $guid; - } - } - - if ($site_guid) { - $options['site_guid'] = $site_guid; - } - - $options['access_id'] = $collection_id; - - return elgg_get_entities_from_access_id($options); -} - -/** - * Retrieve entities for a given access collection - * - * @param int $collection_id - * @param array $options @see elgg_get_entities() - * @return array - * @since 1.7 - */ -function elgg_get_entities_from_access_id(array $options=array()) { +function elgg_get_entities_from_access_id(array $options = array()) { // restrict the resultset to access collection provided if (!isset($options['access_id'])) { return FALSE; @@ -748,70 +857,101 @@ function elgg_get_entities_from_access_id(array $options=array()) { /** * Lists entities from an access collection * - * @param $collection_id - * @param $entity_type - * @param $entity_subtype - * @param $owner_guid - * @param $limit - * @param $fullview - * @param $viewtypetoggle - * @param $pagination - * @return str - */ -function list_entities_from_access_id($collection_id, $entity_type = "", $entity_subtype = "", $owner_guid = 0, $limit = 10, $fullview = true, $viewtypetoggle = true, $pagination = true) { - $offset = (int) get_input('offset'); - $limit = (int) $limit; - $count = get_entities_from_access_id($collection_id, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, "", 0, true); - $entities = get_entities_from_access_id($collection_id, $entity_type, $entity_subtype, $owner_guid, $limit, $offset, "", 0, false); - - return elgg_view_entity_list($entities, $count, $offset, $limit, $fullview, $viewtypetoggle, $pagination); + * @param array $options See elgg_list_entities() and elgg_get_entities_from_access_id() + * + * @see elgg_list_entities() + * @see elgg_get_entities_from_access_id() + * + * @return string + */ +function elgg_list_entities_from_access_id(array $options = array()) { + return elgg_list_entities($options, 'elgg_get_entities_from_access_id'); } /** - * Return a humanreadable version of an entity's access level + * Return the name of an ACCESS_* constant or a access collection, + * but only if the user has write access on that ACL. * - * @param $entity_accessid (int) The entity's access id - * @return string e.g. Public, Private etc - **/ -function get_readable_access_level($entity_accessid){ - $access = (int) $entity_accessid; + * @warning This function probably doesn't work how it's meant to. + * + * @param int $entity_access_id The entity's access id + * + * @return string 'Public', 'Private', etc. + * @since 1.7.0 + * @todo I think this probably wants get_access_array() instead of get_write_access_array(), + * but those two functions return different types of arrays. + */ +function get_readable_access_level($entity_access_id) { + $access = (int) $entity_access_id; + //get the access level for object in readable string $options = get_write_access_array(); - foreach($options as $key => $option) { - if($key == $access){ - $entity_acl = htmlentities($option, ENT_QUOTES, 'UTF-8'); - return $entity_acl; - break; - } + + if (array_key_exists($access, $options)) { + return $options[$access]; } - return false; + + // return 'Limited' if the user does not have access to the access collection + return elgg_echo('access:limited:label'); } /** * Set if entity access system should be ignored. * + * The access system will not return entities in any getter + * functions if the user doesn't have access. + * + * @internal For performance reasons this is done at the database access clause level. + * + * @tip Use this to access entities in automated scripts + * when no user is logged in. + * + * @note This clears the access cache. + * + * @warning This will not show disabled entities. + * Use {@link access_show_hidden_entities()} to access disabled entities. + * + * @param bool $ignore If true, disables all access checks. + * * @return bool Previous ignore_access setting. + * @since 1.7.0 + * @see http://docs.elgg.org/Access/IgnoreAccess + * @see elgg_get_ignore_access() */ function elgg_set_ignore_access($ignore = true) { + $cache = _elgg_get_access_cache(); + $cache->clear(); $elgg_access = elgg_get_access_object(); - return $elgg_access->set_ignore_access($ignore); + return $elgg_access->setIgnoreAccess($ignore); } /** * Get current ignore access setting. * * @return bool + * @since 1.7.0 + * @see http://docs.elgg.org/Access/IgnoreAccess + * @see elgg_set_ignore_access() */ function elgg_get_ignore_access() { - return elgg_get_access_object()->get_ignore_access(); + return elgg_get_access_object()->getIgnoreAccess(); } /** - * Decides if the access system is being ignored. + * Decides if the access system should be ignored for a user. + * + * Returns true (meaning ignore access) if either of these 2 conditions are true: + * 1) an admin user guid is passed to this function. + * 2) {@link elgg_get_ignore_access()} returns true. + * + * @see elgg_set_ignore_access() + * + * @param int $user_guid The user to check against. * * @return bool + * @since 1.7.0 */ -function elgg_check_access_overrides($user_guid = null) { +function elgg_check_access_overrides($user_guid = 0) { if (!$user_guid || $user_guid <= 0) { $is_admin = false; } else { @@ -824,7 +964,12 @@ function elgg_check_access_overrides($user_guid = null) { /** * Returns the ElggAccess object. * + * // @todo comment is incomplete + * This is used to + * * @return ElggAccess + * @since 1.7.0 + * @access private */ function elgg_get_access_object() { static $elgg_access; @@ -836,12 +981,23 @@ function elgg_get_access_object() { return $elgg_access; } -global $init_finished; +/** + * A flag to set if Elgg's access initialization is finished. + * + * @global bool $init_finished + * @access private + * @todo This is required to tell the access system to start caching because + * calls are made while in ignore access mode and before the user is logged in. + */ $init_finished = false; /** * A quick and dirty way to make sure the access permissions have been correctly set up * + * @elgg_event_handler init system + * @todo Invesigate + * + * @return void */ function access_init() { global $init_finished; @@ -849,12 +1005,35 @@ function access_init() { } /** - * Override permissions system + * Overrides the access system if appropriate. * + * Allows admin users and calls after {@link elgg_set_ignore_access} to + * bypass the access system. + * + * Registered for the 'permissions_check', 'all' and the + * 'container_permissions_check', 'all' plugin hooks. + * + * Returns true to override the access system or null if no change is needed. + * + * @param string $hook + * @param string $type + * @param bool $value + * @param array $params * @return true|null + * @access private */ -function elgg_override_permissions_hook($hook, $type, $returnval, $params) { - $user_guid = get_loggedin_userid(); +function elgg_override_permissions($hook, $type, $value, $params) { + $user = elgg_extract('user', $params); + if ($user) { + $user_guid = $user->getGUID(); + } else { + $user_guid = elgg_get_logged_in_user_guid(); + } + + // don't do this so ignore access still works with no one logged in + //if (!$user instanceof ElggUser) { + // return false; + //} // check for admin if ($user_guid && elgg_is_admin_user($user_guid)) { @@ -870,9 +1049,30 @@ function elgg_override_permissions_hook($hook, $type, $returnval, $params) { return NULL; } -// This function will let us know when 'init' has finished -register_elgg_event_handler('init', 'system', 'access_init', 9999); +/** + * Runs unit tests for the entities object. + * + * @param string $hook + * @param string $type + * @param array $value + * @param array $params + * @return array + * + * @access private + */ +function access_test($hook, $type, $value, $params) { + global $CONFIG; + + $value[] = $CONFIG->path . 'engine/tests/api/access_collections.php'; + return $value; +} + +// Tell the access functions the system has booted, plugins are loaded, +// and the user is logged in so it can start caching +elgg_register_event_handler('ready', 'system', 'access_init'); // For overrided permissions -register_plugin_hook('permissions_check', 'all', 'elgg_override_permissions_hook'); -register_plugin_hook('container_permissions_check', 'all', 'elgg_override_permissions_hook'); +elgg_register_plugin_hook_handler('permissions_check', 'all', 'elgg_override_permissions'); +elgg_register_plugin_hook_handler('container_permissions_check', 'all', 'elgg_override_permissions'); + +elgg_register_plugin_hook_handler('unit_test', 'system', 'access_test');
\ No newline at end of file |