diff options
Diffstat (limited to 'engine/lib/access.php')
| -rw-r--r-- | engine/lib/access.php | 296 |
1 files changed, 160 insertions, 136 deletions
diff --git a/engine/lib/access.php b/engine/lib/access.php index 1fe21861d..8035909f8 100644 --- a/engine/lib/access.php +++ b/engine/lib/access.php @@ -1,9 +1,9 @@ <?php /** - * Primary function for Elgg's entity and metadata access systems. + * Functions for Elgg's access system for entities, metadata, and annotations. * * 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 + * one of the ACCESS_* constants defined in {@link elgglib.php} or the ID of an * access collection. * * @package Elgg.Core @@ -16,15 +16,16 @@ * * @uses get_access_array * - * @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 + * @param bool $flush If set to true, will refresh the access list from the + * database rather than using this function's cache. * - * @return string + * @return string A list of access collections suitable for using in an SQL call + * @access private */ function get_access_list($user_id = 0, $site_id = 0, $flush = false) { global $CONFIG, $init_finished; @@ -56,20 +57,30 @@ function get_access_list($user_id = 0, $site_id = 0, $flush = false) { /** * Returns an array of access IDs a user is permitted to see. * - * Can be overridden with the access:collections:read, user plugin hook. + * 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 + * @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 $flush If set to true, will refresh the access ids from the + * database rather than using this function's cache. * * @return array An array of access collections ids - * @see get_access_list() */ function get_access_array($user_id = 0, $site_id = 0, $flush = false) { global $CONFIG, $init_finished; // @todo everything from the db is cached. - // this cache might be redundant. But cache is flushed on every db write. + // this cache might be redundant. But db cache is flushed on every db write. static $access_array; if (!isset($access_array) || (!isset($init_finished)) || (!$init_finished)) { @@ -103,7 +114,7 @@ function get_access_array($user_id = 0, $site_id = 0, $flush = false) { if ($collections = get_data($query)) { foreach ($collections as $collection) { if (!empty($collection->access_collection_id)) { - $tmp_access_array[] = $collection->access_collection_id; + $tmp_access_array[] = (int)$collection->access_collection_id; } } } @@ -115,7 +126,7 @@ function get_access_array($user_id = 0, $site_id = 0, $flush = false) { if ($collections = get_data($query)) { foreach ($collections as $collection) { if (!empty($collection->id)) { - $tmp_access_array[] = $collection->id; + $tmp_access_array[] = (int)$collection->id; } } } @@ -180,11 +191,9 @@ $ENTITY_SHOW_HIDDEN_OVERRIDE = false; /** * Show or hide disabled entities. * - * @access private - * * @param bool $show_hidden Show disabled entities. - * * @return void + * @access private */ function access_show_hidden_entities($show_hidden) { global $ENTITY_SHOW_HIDDEN_OVERRIDE; @@ -194,8 +203,8 @@ function access_show_hidden_entities($show_hidden) { /** * Return current status of showing disabled entities. * - * @access private * @return bool + * @access private */ function access_get_show_hidden_status() { global $ENTITY_SHOW_HIDDEN_OVERRIDE; @@ -203,48 +212,11 @@ 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. - * - * @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 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 $exists If true, returns BOOL if the annotation exists - * - * @return string An SQL fragment suitable for inserting into a WHERE clause - * @todo Document and maybe even remove. At least rename to something that makes sense. - */ -function get_annotation_sql($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; -} - -/** * Returns the SQL where clause for a table with a access_id and enabled columns. * - * This handles returning where clauses for ACCESS_FRIENDS, and the currently - * unused block and filter lists. - * - * @warning If an admin is logged in or {@link elgg_set_ignore_access()} is true, - * this will return blank. + * 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 $owner The guid to check access for. Defaults to logged in user. @@ -260,7 +232,7 @@ function get_access_sql_suffix($table_prefix = '', $owner = null) { $enemies_bit = ""; if ($table_prefix) { - $table_prefix = sanitise_string($table_prefix) . "."; + $table_prefix = sanitise_string($table_prefix) . "."; } if (!isset($owner)) { @@ -277,6 +249,7 @@ function get_access_sql_suffix($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 @@ -285,14 +258,15 @@ function get_access_sql_suffix($table_prefix = '', $owner = null) { $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) . ')'; } } @@ -319,19 +293,59 @@ function get_access_sql_suffix($table_prefix = '', $owner = null) { } /** - * Can $user access $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 3rd user has access - * to an entity that is currently loaded. + * @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 $user Optionally user to check access for. Defaults to - * logged in user (which doesn't make sense). + * logged in user (which is a useless default). * - * @return boolean True if the user can access the entity + * @return bool * @link http://docs.elgg.org/Access */ function has_access_to_entity($entity, $user = null) { @@ -354,12 +368,27 @@ function has_access_to_entity($entity, $user = null) { } /** - * Returns an array of access permissions that the 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 bool $flush If this is set to true, this will ignore any cached version + * @param bool $flush If this is set to true, this will ignore a cached access array * * @return array List of access permissions * @link http://docs.elgg.org/Access @@ -384,15 +413,18 @@ function get_write_access_array($user_id = 0, $site_id = 0, $flush = false) { $query = "SELECT ag.* FROM {$CONFIG->dbprefix}access_collections ag "; $query .= " WHERE (ag.site_guid = {$site_id} OR ag.site_guid = 0)"; $query .= " AND (ag.owner_guid = {$user_id})"; + // ACCESS_PRIVATE through ACCESS_PUBLIC take 0 through 2 + // @todo this AND clause is unnecessary because of id starts at 3 for table $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)) { + ACCESS_PRIVATE => elgg_echo("PRIVATE"), + ACCESS_FRIENDS => elgg_echo("access:friends:label"), + ACCESS_LOGGED_IN => elgg_echo("LOGGED_IN"), + ACCESS_PUBLIC => elgg_echo("PUBLIC") + ); + $collections = get_data($query); + if ($collections) { foreach ($collections as $collection) { $tmp_access_array[$collection->id] = $collection->name; } @@ -410,11 +442,11 @@ function get_write_access_array($user_id = 0, $site_id = 0, $flush = false) { return $tmp_access_array; } - /** - * Can the user write to the access collection? + * Can the user change this access collection? * - * Hook into the access:collections:write, user to change this. + * Use the plugin hook of 'access:collections:write', 'user' to change this. + * @see get_write_access_array() for details on the hook. * * Respects access control disabling for admin users and {@see elgg_set_ignore_access()} * @@ -453,6 +485,8 @@ function can_edit_access_collection($collection_id, $user_guid = null) { * Access colletions allow plugins and users to create granular access * for entities. * + * Triggers plugin hook 'access:collections:addcollection', 'collection' + * * @internal Access collections are stored in the access_collections table. * Memberships to collections are in access_collections_membership. * @@ -460,7 +494,7 @@ function can_edit_access_collection($collection_id, $user_guid = null) { * @param int $owner_guid The GUID of the owner (default: currently logged in user). * @param int $site_guid The GUID of the site (default: current site). * - * @return int|false Depending on success (the collection ID if successful). + * @return int|false The collection ID if successful and false on failure. * @link http://docs.elgg.org/Access/Collections * @see update_access_collection() * @see delete_access_collection() @@ -485,7 +519,8 @@ function create_access_collection($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 (!$id) { return false; } @@ -504,7 +539,7 @@ function create_access_collection($name, $owner_guid = 0, $site_guid = 0) { * Updates the membership in an access collection. * * @warning Expects a full list of all members that should - * be part o the access collection + * be part of the access collection * * @note This will run all hooks associated with adding or removing * members to access collections. @@ -512,7 +547,7 @@ function create_access_collection($name, $owner_guid = 0, $site_guid = 0) { * @param int $collection_id The ID of the collection. * @param array $members Array of member GUIDs * - * @return true|false Depending on success + * @return bool * @link http://docs.elgg.org/Access/Collections * @see add_user_to_access_collection() * @see remove_user_from_access_collection() @@ -585,6 +620,8 @@ function delete_access_collection($collection_id) { * @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 $collection_id The collection ID * * @return object|false @@ -602,15 +639,15 @@ function get_access_collection($collection_id) { /** * Adds a user to an access collection. * - * Emits the access:collections:add_user, collection plugin hook. + * Triggers the 'access:collections:add_user', 'collection' plugin hook. * * @param int $user_guid The GUID of the user to add * @param int $collection_id The ID of the collection to add them to * - * @return true|false Depending on success - * @link http://docs.elgg.org/Access/Collections + * @return bool * @see update_access_collection() * @see remove_user_from_access_collection() + * @link http://docs.elgg.org/Access/Collections */ function add_user_to_access_collection($user_guid, $collection_id) { global $CONFIG; @@ -635,27 +672,25 @@ function add_user_to_access_collection($user_guid, $collection_id) { return false; } - try { - $q = "INSERT INTO {$CONFIG->dbprefix}access_collection_membership - SET access_collection_id = {$collection_id}, - user_guid = {$user_guid}"; - insert_data($q); - } catch (DatabaseException $e) { - return false; - } + $q = "INSERT INTO {$CONFIG->dbprefix}access_collection_membership + SET access_collection_id = {$collection_id}, user_guid = {$user_guid}"; + $result = insert_data($q); - return true; + return $result !== false; } /** * Removes a user from an access collection. * - * Emits the access:collections:remove_user, collection plugin hook. + * Triggers the 'access:collections:remove_user', 'collection' plugin hook. * * @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 $CONFIG; @@ -751,32 +786,13 @@ function get_members_of_access_collection($collection, $idonly = FALSE) { } /** - * Displays a user's access collections, using the core/friends/collections view - * - * @param int $owner_guid The GUID of the owning user - * - * @return string A formatted rendition of the collections - * @todo Move to the friends/collection.php page. - */ -function elgg_view_access_collections($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('core/friends/collections', array('collections' => $collections)); -} - -/** * Return entities based upon access id. * - * @param array $options Any options accepted by {@link elgg_get_entities()} and: + * @param array $options Any options accepted by {@link elgg_get_entities()} and * access_id => int The access ID of the entity. * * @see elgg_get_entities() - * @return mixed if count, int. if not count, array or false if no entities. false also on errors. + * @return mixed if count, int. if not count, array. false on errors. * @since 1.7.0 */ function elgg_get_entities_from_access_id(array $options = array()) { @@ -809,7 +825,7 @@ function elgg_get_entities_from_access_id(array $options = array()) { * @see elgg_list_entities() * @see elgg_get_entities_from_access_id() * - * @return str + * @return string */ function elgg_list_entities_from_access_id(array $options = array()) { return elgg_list_entities($options, 'elgg_get_entities_from_access_id'); @@ -821,15 +837,15 @@ function elgg_list_entities_from_access_id(array $options = array()) { * * @warning This function probably doesn't work how it's meant to. * - * @param int $entity_accessid The entity's access id + * @param int $entity_access_id The entity's access id * - * @return string e.g. Public, Private etc + * @return string 'Public', 'Private', etc. or false if error. * @since 1.7.0 * @todo I think this probably wants get_access_array() instead of get_write_access_array(), * but those two functions return different types of arrays. */ -function get_readable_access_level($entity_accessid) { - $access = (int) $entity_accessid; +function get_readable_access_level($entity_access_id) { + $access = (int) $entity_access_id; //get the access level for object in readable string $options = get_write_access_array(); @@ -851,13 +867,13 @@ function get_readable_access_level($entity_accessid) { * 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 level. + * @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. * - * @warning This will not show disabled entities. Use {@link $ENTITY_SHOW_HIDDEN_OVERRIDE} - * for that. + * @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. * @@ -884,17 +900,20 @@ function elgg_get_ignore_access() { } /** - * 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. * - * The access system can be ignored if 1) an admin user is logged in - * or 2) {@link elgg_set_ignore_access()} was called with true. + * @see elgg_set_ignore_access() * - * @param mixed $user_guid The user to check against. Defaults to logged in. + * @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) { $is_admin = false; } else { @@ -907,6 +926,7 @@ function elgg_check_access_overrides($user_guid = null) { /** * Returns the ElggAccess object. * + * // @todo comment is incomplete * This is used to * * @return ElggAccess @@ -946,16 +966,20 @@ function access_init() { } /** - * Check if the access system should be overridden. + * Overrides the access system if appropriate. * * Allows admin users and calls after {@link elgg_set_ignore_access} to - * by pass the access system. + * 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. * * @return true|null - * @since 1.7.0 - * @elgg_event_handler permissions_check all + * @access private */ -function elgg_override_permissions_hook($hook, $type, $value, $params) { +function elgg_override_permissions($hook, $type, $value, $params) { $user = elgg_extract('user', $params); if (!$user) { $user = elgg_get_logged_in_user_entity(); @@ -995,7 +1019,7 @@ function access_test($hook, $type, $value, $params) { elgg_register_event_handler('init', 'system', 'access_init', 9999); // For overrided permissions -elgg_register_plugin_hook_handler('permissions_check', 'all', 'elgg_override_permissions_hook'); -elgg_register_plugin_hook_handler('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');
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