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Diffstat (limited to 'engine/lib/elgglib.php')
| -rw-r--r-- | engine/lib/elgglib.php | 2288 |
1 files changed, 2288 insertions, 0 deletions
diff --git a/engine/lib/elgglib.php b/engine/lib/elgglib.php new file mode 100644 index 000000000..540605876 --- /dev/null +++ b/engine/lib/elgglib.php @@ -0,0 +1,2288 @@ +<?php +/** + * Bootstrapping and helper procedural code available for use in Elgg core and plugins. + * + * @package Elgg.Core + * @todo These functions can't be subpackaged because they cover a wide mix of + * purposes and subsystems. Many of them should be moved to more relevant files. + */ + +// prep core classes to be autoloadable +spl_autoload_register('_elgg_autoload'); +elgg_register_classes(dirname(dirname(__FILE__)) . '/classes'); + +/** + * Autoload classes + * + * @param string $class The name of the class + * + * @return void + * @throws Exception + * @access private + */ +function _elgg_autoload($class) { + global $CONFIG; + + if (!isset($CONFIG->classes[$class]) || !include($CONFIG->classes[$class])) { + return false; + } +} + +/** + * Register all files found in $dir as classes + * Need to be named MyClass.php + * + * @param string $dir The dir to look in + * + * @return void + * @since 1.8.0 + */ +function elgg_register_classes($dir) { + $classes = elgg_get_file_list($dir, array(), array(), array('.php')); + + foreach ($classes as $class) { + elgg_register_class(basename($class, '.php'), $class); + } +} + +/** + * Register a classname to a file. + * + * @param string $class The name of the class + * @param string $location The location of the file + * + * @return true + * @since 1.8.0 + */ +function elgg_register_class($class, $location) { + global $CONFIG; + + if (!isset($CONFIG->classes)) { + $CONFIG->classes = array(); + } + + $CONFIG->classes[$class] = $location; + + return true; +} + +/** + * Register a php library. + * + * @param string $name The name of the library + * @param string $location The location of the file + * + * @return void + * @since 1.8.0 + */ +function elgg_register_library($name, $location) { + global $CONFIG; + + if (!isset($CONFIG->libraries)) { + $CONFIG->libraries = array(); + } + + $CONFIG->libraries[$name] = $location; +} + +/** + * Load a php library. + * + * @param string $name The name of the library + * + * @return void + * @throws InvalidParameterException + * @since 1.8.0 + */ +function elgg_load_library($name) { + global $CONFIG; + + if (!isset($CONFIG->libraries)) { + $CONFIG->libraries = array(); + } + + if (!isset($CONFIG->libraries[$name])) { + $error = elgg_echo('InvalidParameterException:LibraryNotRegistered', array($name)); + throw new InvalidParameterException($error); + } + + if (!include_once($CONFIG->libraries[$name])) { + $error = elgg_echo('InvalidParameterException:LibraryNotFound', array( + $name, + $CONFIG->libraries[$name]) + ); + throw new InvalidParameterException($error); + } +} + +/** + * Forward to $location. + * + * Sends a 'Location: $location' header and exists. If headers have + * already been sent, returns FALSE. + * + * @param string $location URL to forward to browser to. Can be path relative to the network's URL. + * @param string $reason Short explanation for why we're forwarding + * + * @return False False if headers have been sent. Terminates execution if forwarding. + */ +function forward($location = "", $reason = 'system') { + global $CONFIG; + + if (!headers_sent()) { + if ($location === REFERER) { + $location = $_SERVER['HTTP_REFERER']; + } + + $location = elgg_normalize_url($location); + + // return new forward location or false to stop the forward or empty string to exit + $current_page = current_page_url(); + $params = array('current_url' => $current_page, 'forward_url' => $location); + $location = elgg_trigger_plugin_hook('forward', $reason, $params, $location); + + if ($location) { + header("Location: {$location}"); + exit; + } else if ($location === '') { + exit; + } + } else { + throw new SecurityException(elgg_echo('SecurityException:ForwardFailedToRedirect')); + } +} + +/** + * Register a JavaScript file for inclusion + * + * This function handles adding JavaScript to a web page. If multiple + * calls are made to register the same JavaScript file based on the $id + * variable, only the last file is included. This allows a plugin to add + * JavaScript from a view that may be called more than once. It also handles + * more than one plugin adding the same JavaScript. + * + * jQuery plugins often have filenames such as jquery.rating.js. A best practice + * is to base $name on the filename: "jquery.rating". It is recommended to not + * use version numbers in the name. + * + * The JavaScript files can be local to the server or remote (such as + * Google's CDN). + * + * @param string $name An identifier for the JavaScript library + * @param string $url URL of the JavaScript file + * @param string $location Page location: head or footer. (default: head) + * @param int $priority Priority of the JS file (lower numbers load earlier) + * + * @return bool + * @since 1.8.0 + */ +function elgg_register_js($name, $url, $location = 'head', $priority = null) { + return elgg_register_external_file('js', $name, $url, $location, $priority); +} + +/** + * Unregister a JavaScript file + * + * @param string $name The identifier for the JavaScript library + * + * @return bool + * @since 1.8.0 + */ +function elgg_unregister_js($name) { + return elgg_unregister_external_file('js', $name); +} + +/** + * Load a JavaScript resource on this page + * + * This must be called before elgg_view_page(). It can be called before the + * script is registered. If you do not want a script loaded, unregister it. + * + * @param string $name Identifier of the JavaScript resource + * + * @return void + * @since 1.8.0 + */ +function elgg_load_js($name) { + elgg_load_external_file('js', $name); +} + +/** + * Get the JavaScript URLs that are loaded + * + * @param string $location 'head' or 'footer' + * + * @return array + * @since 1.8.0 + */ +function elgg_get_loaded_js($location = 'head') { + return elgg_get_loaded_external_files('js', $location); +} + +/** + * Register a CSS file for inclusion in the HTML head + * + * @param string $name An identifier for the CSS file + * @param string $url URL of the CSS file + * @param int $priority Priority of the CSS file (lower numbers load earlier) + * + * @return bool + * @since 1.8.0 + */ +function elgg_register_css($name, $url, $priority = null) { + return elgg_register_external_file('css', $name, $url, 'head', $priority); +} + +/** + * Unregister a CSS file + * + * @param string $name The identifier for the CSS file + * + * @return bool + * @since 1.8.0 + */ +function elgg_unregister_css($name) { + return elgg_unregister_external_file('css', $name); +} + +/** + * Load a CSS file for this page + * + * This must be called before elgg_view_page(). It can be called before the + * CSS file is registered. If you do not want a CSS file loaded, unregister it. + * + * @param string $name Identifier of the CSS file + * + * @return void + * @since 1.8.0 + */ +function elgg_load_css($name) { + elgg_load_external_file('css', $name); +} + +/** + * Get the loaded CSS URLs + * + * @return array + * @since 1.8.0 + */ +function elgg_get_loaded_css() { + return elgg_get_loaded_external_files('css', 'head'); +} + +/** + * Core registration function for external files + * + * @param string $type Type of external resource (js or css) + * @param string $name Identifier used as key + * @param string $url URL + * @param string $location Location in the page to include the file + * @param int $priority Loading priority of the file + * + * @return bool + * @since 1.8.0 + */ +function elgg_register_external_file($type, $name, $url, $location, $priority = 500) { + global $CONFIG; + + if (empty($name) || empty($url)) { + return false; + } + + $url = elgg_format_url($url); + $url = elgg_normalize_url($url); + + elgg_bootstrap_externals_data_structure($type); + + $name = trim(strtolower($name)); + + // normalize bogus priorities, but allow empty, null, and false to be defaults. + if (!is_numeric($priority)) { + $priority = 500; + } + + // no negative priorities right now. + $priority = max((int)$priority, 0); + + $item = elgg_extract($name, $CONFIG->externals_map[$type]); + + if ($item) { + // updating a registered item + // don't update loaded because it could already be set + $item->url = $url; + $item->location = $location; + + // if loaded before registered, that means it hasn't been added to the list yet + if ($CONFIG->externals[$type]->contains($item)) { + $priority = $CONFIG->externals[$type]->move($item, $priority); + } else { + $priority = $CONFIG->externals[$type]->add($item, $priority); + } + } else { + $item = new stdClass(); + $item->loaded = false; + $item->url = $url; + $item->location = $location; + + $priority = $CONFIG->externals[$type]->add($item, $priority); + } + + $CONFIG->externals_map[$type][$name] = $item; + + return $priority !== false; +} + +/** + * Unregister an external file + * + * @param string $type Type of file: js or css + * @param string $name The identifier of the file + * + * @return bool + * @since 1.8.0 + */ +function elgg_unregister_external_file($type, $name) { + global $CONFIG; + + elgg_bootstrap_externals_data_structure($type); + + $name = trim(strtolower($name)); + $item = elgg_extract($name, $CONFIG->externals_map[$type]); + + if ($item) { + unset($CONFIG->externals_map[$type][$name]); + return $CONFIG->externals[$type]->remove($item); + } + + return false; +} + +/** + * Load an external resource for use on this page + * + * @param string $type Type of file: js or css + * @param string $name The identifier for the file + * + * @return void + * @since 1.8.0 + */ +function elgg_load_external_file($type, $name) { + global $CONFIG; + + elgg_bootstrap_externals_data_structure($type); + + $name = trim(strtolower($name)); + + $item = elgg_extract($name, $CONFIG->externals_map[$type]); + + if ($item) { + // update a registered item + $item->loaded = true; + } else { + $item = new stdClass(); + $item->loaded = true; + $item->url = ''; + $item->location = ''; + + $priority = $CONFIG->externals[$type]->add($item); + $CONFIG->externals_map[$type][$name] = $item; + } +} + +/** + * Get external resource descriptors + * + * @param string $type Type of file: js or css + * @param string $location Page location + * + * @return array + * @since 1.8.0 + */ +function elgg_get_loaded_external_files($type, $location) { + global $CONFIG; + + if (isset($CONFIG->externals) && $CONFIG->externals[$type] instanceof ElggPriorityList) { + $items = $CONFIG->externals[$type]->getElements(); + + $callback = "return \$v->loaded == true && \$v->location == '$location';"; + $items = array_filter($items, create_function('$v', $callback)); + if ($items) { + array_walk($items, create_function('&$v,$k', '$v = $v->url;')); + } + return $items; + } + return array(); +} + +/** + * Bootstraps the externals data structure in $CONFIG. + * + * @param string $type The type of external, js or css. + * @access private + */ +function elgg_bootstrap_externals_data_structure($type) { + global $CONFIG; + + if (!isset($CONFIG->externals)) { + $CONFIG->externals = array(); + } + + if (!isset($CONFIG->externals[$type]) || !$CONFIG->externals[$type] instanceof ElggPriorityList) { + $CONFIG->externals[$type] = new ElggPriorityList(); + } + + if (!isset($CONFIG->externals_map)) { + $CONFIG->externals_map = array(); + } + + if (!isset($CONFIG->externals_map[$type])) { + $CONFIG->externals_map[$type] = array(); + } +} + +/** + * Returns a list of files in $directory. + * + * Only returns files. Does not recurse into subdirs. + * + * @param string $directory Directory to look in + * @param array $exceptions Array of filenames to ignore + * @param array $list Array of files to append to + * @param mixed $extensions Array of extensions to allow, NULL for all. Use a dot: array('.php'). + * + * @return array Filenames in $directory, in the form $directory/filename. + */ +function elgg_get_file_list($directory, $exceptions = array(), $list = array(), +$extensions = NULL) { + + $directory = sanitise_filepath($directory); + if ($handle = opendir($directory)) { + while (($file = readdir($handle)) !== FALSE) { + if (!is_file($directory . $file) || in_array($file, $exceptions)) { + continue; + } + + if (is_array($extensions)) { + if (in_array(strrchr($file, '.'), $extensions)) { + $list[] = $directory . $file; + } + } else { + $list[] = $directory . $file; + } + } + closedir($handle); + } + + return $list; +} + +/** + * Sanitise file paths ensuring that they begin and end with slashes etc. + * + * @param string $path The path + * @param bool $append_slash Add tailing slash + * + * @return string + */ +function sanitise_filepath($path, $append_slash = TRUE) { + // Convert to correct UNIX paths + $path = str_replace('\\', '/', $path); + $path = str_replace('../', '/', $path); + // replace // with / except when preceeded by : + $path = preg_replace("/([^:])\/\//", "$1/", $path); + + // Sort trailing slash + $path = trim($path); + // rtrim defaults plus / + $path = rtrim($path, " \n\t\0\x0B/"); + + if ($append_slash) { + $path = $path . '/'; + } + + return $path; +} + +/** + * Queues a message to be displayed. + * + * Messages will not be displayed immediately, but are stored in + * for later display, usually upon next page load. + * + * The method of displaying these messages differs depending upon plugins and + * viewtypes. The core default viewtype retrieves messages in + * {@link views/default/page/shells/default.php} and displays messages as + * javascript popups. + * + * @internal Messages are stored as strings in the $_SESSION['msg'][$register] array. + * + * @warning This function is used to both add to and clear the message + * stack. If $messages is null, $register will be returned and cleared. + * If $messages is null and $register is empty, all messages will be + * returned and removed. + * + * @important This function handles the standard {@link system_message()} ($register = + * 'messages') as well as {@link register_error()} messages ($register = 'errors'). + * + * @param mixed $message Optionally, a single message or array of messages to add, (default: null) + * @param string $register Types of message: "error", "success" (default: success) + * @param bool $count Count the number of messages (default: false) + * + * @return true|false|array Either the array of messages, or a response regarding + * whether the message addition was successful. + * @todo Clean up. Separate registering messages and retrieving them. + */ +function system_messages($message = null, $register = "success", $count = false) { + if (!isset($_SESSION['msg'])) { + $_SESSION['msg'] = array(); + } + if (!isset($_SESSION['msg'][$register]) && !empty($register)) { + $_SESSION['msg'][$register] = array(); + } + if (!$count) { + if (!empty($message) && is_array($message)) { + $_SESSION['msg'][$register] = array_merge($_SESSION['msg'][$register], $message); + return true; + } else if (!empty($message) && is_string($message)) { + $_SESSION['msg'][$register][] = $message; + return true; + } else if (is_null($message)) { + if ($register != "") { + $returnarray = array(); + $returnarray[$register] = $_SESSION['msg'][$register]; + $_SESSION['msg'][$register] = array(); + } else { + $returnarray = $_SESSION['msg']; + $_SESSION['msg'] = array(); + } + return $returnarray; + } + } else { + if (!empty($register)) { + return sizeof($_SESSION['msg'][$register]); + } else { + $count = 0; + foreach ($_SESSION['msg'] as $register => $submessages) { + $count += sizeof($submessages); + } + return $count; + } + } + return false; +} + +/** + * Counts the number of messages, either globally or in a particular register + * + * @param string $register Optionally, the register + * + * @return integer The number of messages + */ +function count_messages($register = "") { + return system_messages(null, $register, true); +} + +/** + * Display a system message on next page load. + * + * @see system_messages() + * + * @param string|array $message Message or messages to add + * + * @return bool + */ +function system_message($message) { + return system_messages($message, "success"); +} + +/** + * Display an error on next page load. + * + * @see system_messages() + * + * @param string|array $error Error or errors to add + * + * @return bool + */ +function register_error($error) { + return system_messages($error, "error"); +} + +/** + * Register a callback as an Elgg event handler. + * + * Events are emitted by Elgg when certain actions occur. Plugins + * can respond to these events or halt them completely by registering a handler + * as a callback to an event. Multiple handlers can be registered for + * the same event and will be executed in order of $priority. Any handler + * returning false will halt the execution chain. + * + * This function is called with the event name, event type, and handler callback name. + * Setting the optional $priority allows plugin authors to specify when the + * callback should be run. Priorities for plugins should be 1-1000. + * + * The callback is passed 3 arguments when called: $event, $type, and optional $params. + * + * $event is the name of event being emitted. + * $type is the type of event or object concerned. + * $params is an optional parameter passed that can include a related object. See + * specific event documentation for details on which events pass what parameteres. + * + * @tip If a priority isn't specified it is determined by the order the handler was + * registered relative to the event and type. For plugins, this generally means + * the earlier the plugin is in the load order, the earlier the priorities are for + * any event handlers. + * + * @tip $event and $object_type can use the special keyword 'all'. Handler callbacks registered + * with $event = all will be called for all events of type $object_type. Similarly, + * callbacks registered with $object_type = all will be called for all events of type + * $event, regardless of $object_type. If $event and $object_type both are 'all', the + * handler callback will be called for all events. + * + * @tip Event handler callbacks are considered in the follow order: + * - Specific registration where 'all' isn't used. + * - Registration where 'all' is used for $event only. + * - Registration where 'all' is used for $type only. + * - Registration where 'all' is used for both. + * + * @warning If you use the 'all' keyword, you must have logic in the handler callback to + * test the passed parameters before taking an action. + * + * @tip When referring to events, the preferred syntax is "event, type". + * + * @internal Events are stored in $CONFIG->events as: + * <code> + * $CONFIG->events[$event][$type][$priority] = $callback; + * </code> + * + * @param string $event The event type + * @param string $object_type The object type + * @param string $callback The handler callback + * @param int $priority The priority - 0 is default, negative before, positive after + * + * @return bool + * @link http://docs.elgg.org/Tutorials/Plugins/Events + * @example events/basic.php Basic example of registering an event handler callback. + * @example events/advanced.php Advanced example of registering an event handler + * callback and halting execution. + * @example events/all.php Example of how to use the 'all' keyword. + */ +function elgg_register_event_handler($event, $object_type, $callback, $priority = 500) { + global $CONFIG; + + if (empty($event) || empty($object_type)) { + return false; + } + + if (!isset($CONFIG->events)) { + $CONFIG->events = array(); + } + if (!isset($CONFIG->events[$event])) { + $CONFIG->events[$event] = array(); + } + if (!isset($CONFIG->events[$event][$object_type])) { + $CONFIG->events[$event][$object_type] = array(); + } + + if (!is_callable($callback, true)) { + return false; + } + + $priority = max((int) $priority, 0); + + while (isset($CONFIG->events[$event][$object_type][$priority])) { + $priority++; + } + $CONFIG->events[$event][$object_type][$priority] = $callback; + ksort($CONFIG->events[$event][$object_type]); + return true; +} + +/** + * Unregisters a callback for an event. + * + * @param string $event The event type + * @param string $object_type The object type + * @param string $callback The callback + * + * @return void + * @since 1.7 + */ +function elgg_unregister_event_handler($event, $object_type, $callback) { + global $CONFIG; + + if (isset($CONFIG->events[$event]) && isset($CONFIG->events[$event][$object_type])) { + foreach ($CONFIG->events[$event][$object_type] as $key => $event_callback) { + if ($event_callback == $callback) { + unset($CONFIG->events[$event][$object_type][$key]); + } + } + } +} + +/** + * Trigger an Elgg Event and run all handler callbacks registered to that event, type. + * + * This function runs all handlers registered to $event, $object_type or + * the special keyword 'all' for either or both. + * + * $event is usually a verb: create, update, delete, annotation. + * + * $object_type is usually a noun: object, group, user, annotation, relationship, metadata. + * + * $object is usually an Elgg* object assciated with the event. + * + * @warning Elgg events should only be triggered by core. Plugin authors should use + * {@link trigger_elgg_plugin_hook()} instead. + * + * @tip When referring to events, the preferred syntax is "event, type". + * + * @internal Only rarely should events be changed, added, or removed in core. + * When making changes to events, be sure to first create a ticket in trac. + * + * @internal @tip Think of $object_type as the primary namespace element, and + * $event as the secondary namespace. + * + * @param string $event The event type + * @param string $object_type The object type + * @param string $object The object involved in the event + * + * @return bool The result of running all handler callbacks. + * @link http://docs.elgg.org/Tutorials/Core/Events + * @internal @example events/emit.php Basic emitting of an Elgg event. + */ +function elgg_trigger_event($event, $object_type, $object = null) { + global $CONFIG; + + $events = array(); + if (isset($CONFIG->events[$event][$object_type])) { + $events[] = $CONFIG->events[$event][$object_type]; + } + if (isset($CONFIG->events['all'][$object_type])) { + $events[] = $CONFIG->events['all'][$object_type]; + } + if (isset($CONFIG->events[$event]['all'])) { + $events[] = $CONFIG->events[$event]['all']; + } + if (isset($CONFIG->events['all']['all'])) { + $events[] = $CONFIG->events['all']['all']; + } + + $args = array($event, $object_type, $object); + + foreach ($events as $callback_list) { + if (is_array($callback_list)) { + foreach ($callback_list as $callback) { + if (is_callable($callback) && (call_user_func_array($callback, $args) === false)) { + return false; + } + } + } + } + + return true; +} + +/** + * Register a callback as a plugin hook handler. + * + * Plugin hooks allow developers to losely couple plugins and features by + * repsonding to and emitting {@link elgg_trigger_plugin_hook()} customizable hooks. + * Handler callbacks can respond to the hook, change the details of the hook, or + * ignore it. + * + * Multiple handlers can be registered for a plugin hook, and each callback + * is called in order of priority. If the return value of a handler is not + * null, that value is passed to the next callback in the call stack. When all + * callbacks have been run, the final value is passed back to the caller + * via {@link elgg_trigger_plugin_hook()}. + * + * Similar to Elgg Events, plugin hook handler callbacks are registered by passing + * a hook, a type, and a priority. + * + * The callback is passed 4 arguments when called: $hook, $type, $value, and $params. + * + * - str $hook The name of the hook. + * - str $type The type of hook. + * - mixed $value The return value of the last handler or the default + * value if no other handlers have been called. + * - mixed $params An optional array of parameters. Used to provide additional + * information to plugins. + * + * @internal Plugin hooks are stored in $CONFIG->hooks as: + * <code> + * $CONFIG->hooks[$hook][$type][$priority] = $callback; + * </code> + * + * @tip Plugin hooks are similar to Elgg Events in that Elgg emits + * a plugin hook when certain actions occur, but a plugin hook allows you to alter the + * parameters, as well as halt execution. + * + * @tip If a priority isn't specified it is determined by the order the handler was + * registered relative to the event and type. For plugins, this generally means + * the earlier the plugin is in the load order, the earlier the priorities are for + * any event handlers. + * + * @tip Like Elgg Events, $hook and $type can use the special keyword 'all'. + * Handler callbacks registered with $hook = all will be called for all hooks + * of type $type. Similarly, handlers registered with $type = all will be + * called for all hooks of type $event, regardless of $object_type. If $hook + * and $type both are 'all', the handler will be called for all hooks. + * + * @tip Plugin hooks are sometimes used to gather lists from plugins. This is + * usually done by pushing elements into an array passed in $params. Be sure + * to append to and then return $value so you don't overwrite other plugin's + * values. + * + * @warning Unlike Elgg Events, a handler that returns false will NOT halt the + * execution chain. + * + * @param string $hook The name of the hook + * @param string $type The type of the hook + * @param callback $callback The name of a valid function or an array with object and method + * @param int $priority The priority - 500 is default, lower numbers called first + * + * @return bool + * + * @example hooks/register/basic.php Registering for a plugin hook and examining the variables. + * @example hooks/register/advanced.php Registering for a plugin hook and changing the params. + * @link http://docs.elgg.org/Tutorials/Plugins/Hooks + * @since 1.8.0 + */ +function elgg_register_plugin_hook_handler($hook, $type, $callback, $priority = 500) { + global $CONFIG; + + if (empty($hook) || empty($type)) { + return false; + } + + if (!isset($CONFIG->hooks)) { + $CONFIG->hooks = array(); + } + if (!isset($CONFIG->hooks[$hook])) { + $CONFIG->hooks[$hook] = array(); + } + if (!isset($CONFIG->hooks[$hook][$type])) { + $CONFIG->hooks[$hook][$type] = array(); + } + + if (!is_callable($callback, true)) { + return false; + } + + $priority = max((int) $priority, 0); + + while (isset($CONFIG->hooks[$hook][$type][$priority])) { + $priority++; + } + $CONFIG->hooks[$hook][$type][$priority] = $callback; + ksort($CONFIG->hooks[$hook][$type]); + return true; +} + +/** + * Unregister a callback as a plugin hook. + * + * @param string $hook The name of the hook + * @param string $entity_type The name of the type of entity (eg "user", "object" etc) + * @param callback $callback The PHP callback to be removed + * + * @return void + * @since 1.8.0 + */ +function elgg_unregister_plugin_hook_handler($hook, $entity_type, $callback) { + global $CONFIG; + + if (isset($CONFIG->hooks[$hook]) && isset($CONFIG->hooks[$hook][$entity_type])) { + foreach ($CONFIG->hooks[$hook][$entity_type] as $key => $hook_callback) { + if ($hook_callback == $callback) { + unset($CONFIG->hooks[$hook][$entity_type][$key]); + } + } + } +} + +/** + * Trigger a Plugin Hook and run all handler callbacks registered to that hook:type. + * + * This function runs all handlers regsitered to $hook, $type or + * the special keyword 'all' for either or both. + * + * Use $params to send additional information to the handler callbacks. + * + * $returnvalue Is the initial value to pass to the handlers, which can + * then change it. It is useful to use $returnvalue to set defaults. + * If no handlers are registered, $returnvalue is immediately returned. + * + * $hook is usually a verb: import, get_views, output. + * + * $type is usually a noun: user, ecml, page. + * + * @tip Like Elgg Events, $hook and $type can use the special keyword 'all'. + * Handler callbacks registered with $hook = all will be called for all hooks + * of type $type. Similarly, handlers registered with $type = all will be + * called for all hooks of type $event, regardless of $object_type. If $hook + * and $type both are 'all', the handler will be called for all hooks. + * + * @internal The checks for $hook and/or $type not being equal to 'all' is to + * prevent a plugin hook being registered with an 'all' being called more than + * once if the trigger occurs with an 'all'. An example in core of this is in + * actions.php: + * elgg_trigger_plugin_hook('action_gatekeeper:permissions:check', 'all', ...) + * + * @see elgg_register_plugin_hook_handler() + * + * @param string $hook The name of the hook to trigger ("all" will + * trigger for all $types regardless of $hook value) + * @param string $type The type of the hook to trigger ("all" will + * trigger for all $hooks regardless of $type value) + * @param mixed $params Additional parameters to pass to the handlers + * @param mixed $returnvalue An initial return value + * + * @return mixed|null The return value of the last handler callback called + * + * @example hooks/trigger/basic.php Trigger a hook that determins if execution + * should continue. + * @example hooks/trigger/advanced.php Trigger a hook with a default value and use + * the results to populate a menu. + * @example hooks/basic.php Trigger and respond to a basic plugin hook. + * @link http://docs.elgg.org/Tutorials/Plugins/Hooks + * + * @since 1.8.0 + */ +function elgg_trigger_plugin_hook($hook, $type, $params = null, $returnvalue = null) { + global $CONFIG; + + $hooks = array(); + if (isset($CONFIG->hooks[$hook][$type])) { + if ($hook != 'all' && $type != 'all') { + $hooks[] = $CONFIG->hooks[$hook][$type]; + } + } + if (isset($CONFIG->hooks['all'][$type])) { + if ($type != 'all') { + $hooks[] = $CONFIG->hooks['all'][$type]; + } + } + if (isset($CONFIG->hooks[$hook]['all'])) { + if ($hook != 'all') { + $hooks[] = $CONFIG->hooks[$hook]['all']; + } + } + if (isset($CONFIG->hooks['all']['all'])) { + $hooks[] = $CONFIG->hooks['all']['all']; + } + + foreach ($hooks as $callback_list) { + if (is_array($callback_list)) { + foreach ($callback_list as $hookcallback) { + if (is_callable($hookcallback)) { + $args = array($hook, $type, $returnvalue, $params); + $temp_return_value = call_user_func_array($hookcallback, $args); + if (!is_null($temp_return_value)) { + $returnvalue = $temp_return_value; + } + } + } + } + } + + return $returnvalue; +} + +/** + * Intercepts, logs, and displays uncaught exceptions. + * + * @warning This function should never be called directly. + * + * @see http://www.php.net/set-exception-handler + * + * @param Exception $exception The exception being handled + * + * @return void + * @access private + */ +function _elgg_php_exception_handler($exception) { + $timestamp = time(); + error_log("Exception #$timestamp: $exception"); + + // Wipe any existing output buffer + ob_end_clean(); + + // make sure the error isn't cached + header("Cache-Control: no-cache, must-revalidate", true); + header('Expires: Fri, 05 Feb 1982 00:00:00 -0500', true); + // @note Do not send a 500 header because it is not a server error + + try { + // we don't want the 'pagesetup', 'system' event to fire + global $CONFIG; + $CONFIG->pagesetupdone = true; + + elgg_set_viewtype('failsafe'); + if (elgg_is_admin_logged_in()) { + $body = elgg_view("messages/exceptions/admin_exception", array( + 'object' => $exception, + 'ts' => $timestamp + )); + } else { + $body = elgg_view("messages/exceptions/exception", array( + 'object' => $exception, + 'ts' => $timestamp + )); + } + echo elgg_view_page(elgg_echo('exception:title'), $body); + } catch (Exception $e) { + $timestamp = time(); + $message = $e->getMessage(); + echo "Fatal error in exception handler. Check log for Exception #$timestamp"; + error_log("Exception #$timestamp : fatal error in exception handler : $message"); + } +} + +/** + * Intercepts catchable PHP errors. + * + * @warning This function should never be called directly. + * + * @internal + * For catchable fatal errors, throws an Exception with the error. + * + * For non-fatal errors, depending upon the debug settings, either + * log the error or ignore it. + * + * @see http://www.php.net/set-error-handler + * + * @param int $errno The level of the error raised + * @param string $errmsg The error message + * @param string $filename The filename the error was raised in + * @param int $linenum The line number the error was raised at + * @param array $vars An array that points to the active symbol table where error occurred + * + * @return true + * @access private + * @todo Replace error_log calls with elgg_log calls. + */ +function _elgg_php_error_handler($errno, $errmsg, $filename, $linenum, $vars) { + $error = date("Y-m-d H:i:s (T)") . ": \"$errmsg\" in file $filename (line $linenum)"; + + switch ($errno) { + case E_USER_ERROR: + error_log("PHP ERROR: $error"); + register_error("ERROR: $error"); + + // Since this is a fatal error, we want to stop any further execution but do so gracefully. + throw new Exception($error); + break; + + case E_WARNING : + case E_USER_WARNING : + case E_RECOVERABLE_ERROR: // (e.g. type hint violation) + + // check if the error wasn't suppressed by the error control operator (@) + if (error_reporting()) { + error_log("PHP WARNING: $error"); + } + break; + + default: + global $CONFIG; + if (isset($CONFIG->debug) && $CONFIG->debug === 'NOTICE') { + error_log("PHP NOTICE: $error"); + } + } + + return true; +} + +/** + * Display or log a message. + * + * If $level is >= to the debug setting in {@link $CONFIG->debug}, the + * message will be sent to {@link elgg_dump()}. Messages with lower + * priority than {@link $CONFIG->debug} are ignored. + * + * {@link elgg_dump()} outputs all levels but NOTICE to screen by default. + * + * @note No messages will be displayed unless debugging has been enabled. + * + * @param string $message User message + * @param string $level NOTICE | WARNING | ERROR | DEBUG + * + * @return bool + * @since 1.7.0 + * @todo This is complicated and confusing. Using int constants for debug levels will + * make things easier. + */ +function elgg_log($message, $level = 'NOTICE') { + global $CONFIG; + + // only log when debugging is enabled + if (isset($CONFIG->debug)) { + // debug to screen or log? + $to_screen = !($CONFIG->debug == 'NOTICE'); + + switch ($level) { + case 'ERROR': + // always report + elgg_dump("$level: $message", $to_screen, $level); + break; + case 'WARNING': + case 'DEBUG': + // report except if user wants only errors + if ($CONFIG->debug != 'ERROR') { + elgg_dump("$level: $message", $to_screen, $level); + } + break; + case 'NOTICE': + default: + // only report when lowest level is desired + if ($CONFIG->debug == 'NOTICE') { + elgg_dump("$level: $message", FALSE, $level); + } + break; + } + + return TRUE; + } + + return FALSE; +} + +/** + * Logs or displays $value. + * + * If $to_screen is true, $value is displayed to screen. Else, + * it is handled by PHP's {@link error_log()} function. + * + * A {@elgg_plugin_hook debug log} is called. If a handler returns + * false, it will stop the default logging method. + * + * @param mixed $value The value + * @param bool $to_screen Display to screen? + * @param string $level The debug level + * + * @return void + * @since 1.7.0 + */ +function elgg_dump($value, $to_screen = TRUE, $level = 'NOTICE') { + global $CONFIG; + + // plugin can return false to stop the default logging method + $params = array( + 'level' => $level, + 'msg' => $value, + 'to_screen' => $to_screen, + ); + if (!elgg_trigger_plugin_hook('debug', 'log', $params, true)) { + return; + } + + // Do not want to write to screen before page creation has started. + // This is not fool-proof but probably fixes 95% of the cases when logging + // results in data sent to the browser before the page is begun. + if (!isset($CONFIG->pagesetupdone)) { + $to_screen = FALSE; + } + + if ($to_screen == TRUE) { + echo '<pre>'; + print_r($value); + echo '</pre>'; + } else { + error_log(print_r($value, TRUE)); + } +} + +/** + * Sends a notice about deprecated use of a function, view, etc. + * + * This function either displays or logs the deprecation message, + * depending upon the deprecation policies in {@link CODING.txt}. + * Logged messages are sent with the level of 'WARNING'. Only admins + * get visual deprecation notices. When non-admins are logged in, the + * notices are sent to PHP's log through elgg_dump(). + * + * A user-visual message will be displayed if $dep_version is greater + * than 1 minor releases lower than the current Elgg version, or at all + * lower than the current Elgg major version. + * + * @note This will always at least log a warning. Don't use to pre-deprecate things. + * This assumes we are releasing in order and deprecating according to policy. + * + * @see CODING.txt + * + * @param string $msg Message to log / display. + * @param string $dep_version Human-readable *release* version: 1.7, 1.8, ... + * @param int $backtrace_level How many levels back to display the backtrace. + * Useful if calling from functions that are called + * from other places (like elgg_view()). Set to -1 + * for a full backtrace. + * + * @return bool + * @since 1.7.0 + */ +function elgg_deprecated_notice($msg, $dep_version, $backtrace_level = 1) { + // if it's a major release behind, visual and logged + // if it's a 1 minor release behind, visual and logged + // if it's for current minor release, logged. + // bugfixes don't matter because we are not deprecating between them + + if (!$dep_version) { + return false; + } + + $elgg_version = get_version(true); + $elgg_version_arr = explode('.', $elgg_version); + $elgg_major_version = (int)$elgg_version_arr[0]; + $elgg_minor_version = (int)$elgg_version_arr[1]; + + $dep_major_version = (int)$dep_version; + $dep_minor_version = 10 * ($dep_version - $dep_major_version); + + $visual = false; + + if (($dep_major_version < $elgg_major_version) || + ($dep_minor_version < $elgg_minor_version)) { + $visual = true; + } + + $msg = "Deprecated in $dep_major_version.$dep_minor_version: $msg"; + + if ($visual && elgg_is_admin_logged_in()) { + register_error($msg); + } + + // Get a file and line number for the log. Never show this in the UI. + // Skip over the function that sent this notice and see who called the deprecated + // function itself. + $msg .= " Called from "; + $stack = array(); + $backtrace = debug_backtrace(); + // never show this call. + array_shift($backtrace); + $i = count($backtrace); + + foreach ($backtrace as $trace) { + $stack[] = "[#$i] {$trace['file']}:{$trace['line']}"; + $i--; + + if ($backtrace_level > 0) { + if ($backtrace_level <= 1) { + break; + } + $backtrace_level--; + } + } + + $msg .= implode("<br /> -> ", $stack); + + elgg_log($msg, 'WARNING'); + + return true; +} + +/** + * Returns the current page's complete URL. + * + * The current URL is assembled using the network's wwwroot and the request URI + * in $_SERVER as populated by the web server. This function will include + * any schemes, usernames and passwords, and ports. + * + * @return string The current page URL. + */ +function current_page_url() { + global $CONFIG; + + $url = parse_url(elgg_get_site_url()); + + $page = $url['scheme'] . "://"; + + // user/pass + if ((isset($url['user'])) && ($url['user'])) { + $page .= $url['user']; + } + if ((isset($url['pass'])) && ($url['pass'])) { + $page .= ":" . $url['pass']; + } + if ((isset($url['user']) && $url['user']) || + (isset($url['pass']) && $url['pass'])) { + $page .= "@"; + } + + $page .= $url['host']; + + if ((isset($url['port'])) && ($url['port'])) { + $page .= ":" . $url['port']; + } + + $page = trim($page, "/"); + + $page .= $_SERVER['REQUEST_URI']; + + return $page; +} + +/** + * Return the full URL of the current page. + * + * @return string The URL + * @todo Combine / replace with current_page_url() + */ +function full_url() { + $s = empty($_SERVER["HTTPS"]) ? '' : ($_SERVER["HTTPS"] == "on") ? "s" : ""; + $protocol = substr(strtolower($_SERVER["SERVER_PROTOCOL"]), 0, + strpos(strtolower($_SERVER["SERVER_PROTOCOL"]), "/")) . $s; + + $port = ($_SERVER["SERVER_PORT"] == "80" || $_SERVER["SERVER_PORT"] == "443") ? + "" : (":" . $_SERVER["SERVER_PORT"]); + + // This is here to prevent XSS in poorly written browsers used by 80% of the population. + // {@trac [5813]} + $quotes = array('\'', '"'); + $encoded = array('%27', '%22'); + + return $protocol . "://" . $_SERVER['SERVER_NAME'] . $port . + str_replace($quotes, $encoded, $_SERVER['REQUEST_URI']); +} + +/** + * Builds a URL from the a parts array like one returned by {@link parse_url()}. + * + * @note If only partial information is passed, a partial URL will be returned. + * + * @param array $parts Associative array of URL components like parse_url() returns + * @param bool $html_encode HTML Encode the url? + * + * @return str Full URL + * @since 1.7.0 + */ +function elgg_http_build_url(array $parts, $html_encode = TRUE) { + // build only what's given to us. + $scheme = isset($parts['scheme']) ? "{$parts['scheme']}://" : ''; + $host = isset($parts['host']) ? "{$parts['host']}" : ''; + $port = isset($parts['port']) ? ":{$parts['port']}" : ''; + $path = isset($parts['path']) ? "{$parts['path']}" : ''; + $query = isset($parts['query']) ? "?{$parts['query']}" : ''; + + $string = $scheme . $host . $port . $path . $query; + + if ($html_encode) { + return elgg_format_url($string); + } else { + return $string; + } +} + +/** + * Adds action tokens to URL + * + * As of 1.7.0 action tokens are required on all actions. + * Use this function to append action tokens to a URL's GET parameters. + * This will preserve any existing GET parameters. + * + * @note If you are using {@elgg_view input/form} you don't need to + * add tokens to the action. The form view automatically handles + * tokens. + * + * @param str $url Full action URL + * @param bool $html_encode HTML encode the url? (default: false) + * + * @return str URL with action tokens + * @since 1.7.0 + * @link http://docs.elgg.org/Tutorials/Actions + */ +function elgg_add_action_tokens_to_url($url, $html_encode = FALSE) { + $components = parse_url(elgg_normalize_url($url)); + + if (isset($components['query'])) { + $query = elgg_parse_str($components['query']); + } else { + $query = array(); + } + + if (isset($query['__elgg_ts']) && isset($query['__elgg_token'])) { + return $url; + } + + // append action tokens to the existing query + $query['__elgg_ts'] = time(); + $query['__elgg_token'] = generate_action_token($query['__elgg_ts']); + $components['query'] = http_build_query($query); + + // rebuild the full url + return elgg_http_build_url($components, $html_encode); +} + +/** + * Removes an element from a URL's query string. + * + * @note You can send a partial URL string. + * + * @param string $url Full URL + * @param string $element The element to remove + * + * @return string The new URL with the query element removed. + * @since 1.7.0 + */ +function elgg_http_remove_url_query_element($url, $element) { + $url_array = parse_url($url); + + if (isset($url_array['query'])) { + $query = elgg_parse_str($url_array['query']); + } else { + // nothing to remove. Return original URL. + return $url; + } + + if (array_key_exists($element, $query)) { + unset($query[$element]); + } + + $url_array['query'] = http_build_query($query); + $string = elgg_http_build_url($url_array); + return $string; +} + +/** + * Adds an element or elements to a URL's query string. + * + * @param str $url The URL + * @param array $elements Key/value pairs to add to the URL + * + * @return str The new URL with the query strings added + * @since 1.7.0 + */ +function elgg_http_add_url_query_elements($url, array $elements) { + $url_array = parse_url($url); + + if (isset($url_array['query'])) { + $query = elgg_parse_str($url_array['query']); + } else { + $query = array(); + } + + foreach ($elements as $k => $v) { + $query[$k] = $v; + } + + $url_array['query'] = http_build_query($query); + $string = elgg_http_build_url($url_array, false); + + return $string; +} + +/** + * Test if two URLs are functionally identical. + * + * @tip If $ignore_params is used, neither the name nor its value will be considered when comparing. + * + * @tip The order of GET params doesn't matter. + * + * @param string $url1 First URL + * @param string $url2 Second URL + * @param array $ignore_params GET params to ignore in the comparison + * + * @return bool + * @since 1.8.0 + */ +function elgg_http_url_is_identical($url1, $url2, $ignore_params = array('offset', 'limit')) { + global $CONFIG; + + // if the server portion is missing but it starts with / then add the url in. + // @todo use elgg_normalize_url() + if (elgg_substr($url1, 0, 1) == '/') { + $url1 = elgg_get_site_url() . ltrim($url1, '/'); + } + + if (elgg_substr($url1, 0, 1) == '/') { + $url2 = elgg_get_site_url() . ltrim($url2, '/'); + } + + // @todo - should probably do something with relative URLs + + if ($url1 == $url2) { + return TRUE; + } + + $url1_info = parse_url($url1); + $url2_info = parse_url($url2); + + if (isset($url1_info['path'])) { + $url1_info['path'] = trim($url1_info['path'], '/'); + } + if (isset($url2_info['path'])) { + $url2_info['path'] = trim($url2_info['path'], '/'); + } + + // compare basic bits + $parts = array('scheme', 'host', 'path'); + + foreach ($parts as $part) { + if ((isset($url1_info[$part]) && isset($url2_info[$part])) + && $url1_info[$part] != $url2_info[$part]) { + return FALSE; + } elseif (isset($url1_info[$part]) && !isset($url2_info[$part])) { + return FALSE; + } elseif (!isset($url1_info[$part]) && isset($url2_info[$part])) { + return FALSE; + } + } + + // quick compare of get params + if (isset($url1_info['query']) && isset($url2_info['query']) + && $url1_info['query'] == $url2_info['query']) { + return TRUE; + } + + // compare get params that might be out of order + $url1_params = array(); + $url2_params = array(); + + if (isset($url1_info['query'])) { + if ($url1_info['query'] = html_entity_decode($url1_info['query'])) { + $url1_params = elgg_parse_str($url1_info['query']); + } + } + + if (isset($url2_info['query'])) { + if ($url2_info['query'] = html_entity_decode($url2_info['query'])) { + $url2_params = elgg_parse_str($url2_info['query']); + } + } + + // drop ignored params + foreach ($ignore_params as $param) { + if (isset($url1_params[$param])) { + unset($url1_params[$param]); + } + if (isset($url2_params[$param])) { + unset($url2_params[$param]); + } + } + + // array_diff_assoc only returns the items in arr1 that aren't in arrN + // but not the items that ARE in arrN but NOT in arr1 + // if arr1 is an empty array, this function will return 0 no matter what. + // since we only care if they're different and not how different, + // add the results together to get a non-zero (ie, different) result + $diff_count = count(array_diff_assoc($url1_params, $url2_params)); + $diff_count += count(array_diff_assoc($url2_params, $url1_params)); + if ($diff_count > 0) { + return FALSE; + } + + return TRUE; +} + +/** + * Checks for $array[$key] and returns its value if it exists, else + * returns $default. + * + * Shorthand for $value = (isset($array['key'])) ? $array['key'] : 'default'; + * + * @param string $key The key to check. + * @param array $array The array to check against. + * @param mixed $default Default value to return if nothing is found. + * @param bool $strict Return array key if it's set, even if empty. If false, + * return $default if the array key is unset or empty. + * + * @return mixed + * @since 1.8.0 + */ +function elgg_extract($key, array $array, $default = null, $strict = true) { + if (!is_array($array)) { + return $default; + } + + if ($strict) { + return (isset($array[$key])) ? $array[$key] : $default; + } else { + return (isset($array[$key]) && !empty($array[$key])) ? $array[$key] : $default; + } +} + +/** + * Sorts a 3d array by specific element. + * + * @warning Will re-index numeric indexes. + * + * @note This operates the same as the built-in sort functions. + * It sorts the array and returns a bool for success. + * + * Do this: elgg_sort_3d_array_by_value($my_array); + * Not this: $my_array = elgg_sort_3d_array_by_value($my_array); + * + * @param array &$array Array to sort + * @param string $element Element to sort by + * @param int $sort_order PHP sort order + * {@see http://us2.php.net/array_multisort} + * @param int $sort_type PHP sort type + * {@see http://us2.php.net/sort} + * + * @return bool + */ +function elgg_sort_3d_array_by_value(&$array, $element, $sort_order = SORT_ASC, +$sort_type = SORT_LOCALE_STRING) { + + $sort = array(); + + foreach ($array as $k => $v) { + if (isset($v[$element])) { + $sort[] = strtolower($v[$element]); + } else { + $sort[] = NULL; + } + }; + + return array_multisort($sort, $sort_order, $sort_type, $array); +} + +/** + * Return the state of a php.ini setting as a bool + * + * @warning Using this on ini settings that are not boolean + * will be inaccurate! + * + * @param string $ini_get_arg The INI setting + * + * @return true|false Depending on whether it's on or off + */ +function ini_get_bool($ini_get_arg) { + $temp = strtolower(ini_get($ini_get_arg)); + + if ($temp == '1' || $temp == 'on' || $temp == 'true') { + return true; + } + return false; +} + +/** + * Returns a PHP INI setting in bytes. + * + * @tip Use this for arithmetic when determining if a file can be uploaded. + * + * @param str $setting The php.ini setting + * + * @return int + * @since 1.7.0 + * @link http://www.php.net/manual/en/function.ini-get.php + */ +function elgg_get_ini_setting_in_bytes($setting) { + // retrieve INI setting + $val = ini_get($setting); + + // convert INI setting when shorthand notation is used + $last = strtolower($val[strlen($val) - 1]); + switch($last) { + case 'g': + $val *= 1024; + case 'm': + $val *= 1024; + case 'k': + $val *= 1024; + } + + // return byte value + return $val; +} + +/** + * Returns true is string is not empty, false, or null. + * + * Function to be used in array_filter which returns true if $string is not null. + * + * @param string $string The string to test + * + * @return bool + * @todo This is used once in metadata.php. Use a lambda function instead. + */ +function is_not_null($string) { + if (($string === '') || ($string === false) || ($string === null)) { + return false; + } + + return true; +} + +/** + * Normalise the singular keys in an options array to plural keys. + * + * Used in elgg_get_entities*() functions to support shortcutting plural + * names by singular names. + * + * @param array $options The options array. $options['keys'] = 'values'; + * @param array $singulars A list of singular words to pluralize by adding 's'. + * + * @return array + * @since 1.7.0 + * @access private + */ +function elgg_normalise_plural_options_array($options, $singulars) { + foreach ($singulars as $singular) { + $plural = $singular . 's'; + + if (array_key_exists($singular, $options)) { + if ($options[$singular] === ELGG_ENTITIES_ANY_VALUE) { + $options[$plural] = $options[$singular]; + } else { + // Test for array refs #2641 + if (!is_array($options[$singular])) { + $options[$plural] = array($options[$singular]); + } else { + $options[$plural] = $options[$singular]; + } + } + } + + unset($options[$singular]); + } + + return $options; +} + +/** + * Emits a shutdown:system event upon PHP shutdown, but before database connections are dropped. + * + * @tip Register for the shutdown:system event to perform functions at the end of page loads. + * + * @warning Using this event to perform long-running functions is not very + * useful. Servers will hold pages until processing is done before sending + * them out to the browser. + * + * @see http://www.php.net/register-shutdown-function + * + * @return void + * @see register_shutdown_hook() + * @access private + */ +function _elgg_shutdown_hook() { + global $START_MICROTIME; + + try { + elgg_trigger_event('shutdown', 'system'); + + $time = (float)(microtime(TRUE) - $START_MICROTIME); + // demoted to NOTICE from DEBUG so javascript is not corrupted + elgg_log("Page {$_SERVER['REQUEST_URI']} generated in $time seconds", 'NOTICE'); + } catch (Exception $e) { + $message = 'Error: ' . get_class($e) . ' thrown within the shutdown handler. '; + $message .= "Message: '{$e->getMessage()}' in file {$e->getFile()} (line {$e->getLine()})"; + error_log($message); + error_log("Exception trace stack: {$e->getTraceAsString()}"); + } +} + +/** + * Serve javascript pages. + * + * Searches for views under js/ and outputs them with special + * headers for caching control. + * + * @param array $page The page array + * + * @return bool + * @elgg_pagehandler js + * @access private + */ +function elgg_js_page_handler($page) { + return elgg_cacheable_view_page_handler($page, 'js'); +} + +/** + * Serve individual views for Ajax. + * + * /ajax/view/<name of view>?<key/value params> + * + * @param array $page The page array + * + * @return bool + * @elgg_pagehandler ajax + * @access private + */ +function elgg_ajax_page_handler($page) { + if (is_array($page) && sizeof($page)) { + // throw away 'view' and form the view name + unset($page[0]); + $view = implode('/', $page); + + $allowed_views = elgg_get_config('allowed_ajax_views'); + if (!array_key_exists($view, $allowed_views)) { + header('HTTP/1.1 403 Forbidden'); + exit; + } + + // pull out GET parameters through filter + $vars = array(); + foreach ($_GET as $name => $value) { + $vars[$name] = get_input($name); + } + + if (isset($vars['guid'])) { + $vars['entity'] = get_entity($vars['guid']); + } + + echo elgg_view($view, $vars); + return true; + } + return false; +} + +/** + * Serve CSS + * + * Serves CSS from the css views directory with headers for caching control + * + * @param array $page The page array + * + * @return void + * @elgg_pagehandler css + * @access private + */ +function elgg_css_page_handler($page) { + if (!isset($page[0])) { + // default css + $page[0] = 'elgg'; + } + + return elgg_cacheable_view_page_handler($page, 'css'); +} + +/** + * Serves a JS or CSS view with headers for caching. + * + * /<css||js>/name/of/view.<last_cache>.<css||js> + * + * @param array $page The page array + * @param string $type The type: js or css + * + * @return bool + * @access private + */ +function elgg_cacheable_view_page_handler($page, $type) { + + switch ($type) { + case 'js': + $content_type = 'text/javascript'; + break; + + case 'css': + $content_type = 'text/css'; + break; + + default: + return false; + break; + } + + if ($page) { + // the view file names can have multiple dots + // eg: views/default/js/calendars/jquery.fullcalendar.min.php + // translates to the url /js/calendars/jquery.fullcalendar.min.<ts>.js + // and the view js/calendars/jquery.fullcalendar.min + // we ignore the last two dots for the ts and the ext. + // Additionally, the timestamp is optional. + $page = implode('/', $page); + $regex = '|(.+?)\.([\d]+\.)?\w+$|'; + preg_match($regex, $page, $matches); + $view = $matches[1]; + $return = elgg_view("$type/$view"); + + header("Content-type: $content_type"); + + // @todo should js be cached when simple cache turned off + //header('Expires: ' . gmdate('D, d M Y H:i:s \G\M\T', strtotime("+10 days")), true); + //header("Pragma: public"); + //header("Cache-Control: public"); + //header("Content-Length: " . strlen($return)); + + echo $return; + return true; + } +} + +/** + * Reverses the ordering in an ORDER BY clause. This is achived by replacing + * asc with desc, or appending desc to the end of the clause. + * + * This is used mostly for elgg_get_entities() and other similar functions. + * + * @param string $order_by An order by clause + * @access private + * @return string + * @access private + */ +function elgg_sql_reverse_order_by_clause($order_by) { + $order_by = strtolower($order_by); + + if (strpos($order_by, ' asc') !== false) { + $return = str_replace(' asc', ' desc', $order_by); + } elseif (strpos($order_by, ' desc') !== false) { + $return = str_replace(' desc', ' asc', $order_by); + } else { + // no order specified, so default to desc since mysql defaults to asc + $return = $order_by . ' desc'; + } + + return $return; +} + +/** + * Enable objects with an enable() method. + * + * Used as a callback for ElggBatch. + * + * @todo why aren't these static methods on ElggBatch? + * + * @param object $object The object to enable + * @return bool + * @access private + */ +function elgg_batch_enable_callback($object) { + // our db functions return the number of rows affected... + return $object->enable() ? true : false; +} + +/** + * Disable objects with a disable() method. + * + * Used as a callback for ElggBatch. + * + * @param object $object The object to disable + * @return bool + * @access private + */ +function elgg_batch_disable_callback($object) { + // our db functions return the number of rows affected... + return $object->disable() ? true : false; +} + +/** + * Delete objects with a delete() method. + * + * Used as a callback for ElggBatch. + * + * @param object $object The object to disable + * @return bool + * @access private + */ +function elgg_batch_delete_callback($object) { + // our db functions return the number of rows affected... + return $object->delete() ? true : false; +} + +/** + * Checks if there are some constraints on the options array for + * potentially dangerous operations. + * + * @param array $options Options array + * @param string $type Options type: metadata or annotations + * @return bool + * @access private + */ +function elgg_is_valid_options_for_batch_operation($options, $type) { + if (!$options || !is_array($options)) { + return false; + } + + // at least one of these is required. + $required = array( + // generic restraints + 'guid', 'guids' + ); + + switch ($type) { + case 'metadata': + $metadata_required = array( + 'metadata_owner_guid', 'metadata_owner_guids', + 'metadata_name', 'metadata_names', + 'metadata_value', 'metadata_values' + ); + + $required = array_merge($required, $metadata_required); + break; + + case 'annotations': + case 'annotation': + $annotations_required = array( + 'annotation_owner_guid', 'annotation_owner_guids', + 'annotation_name', 'annotation_names', + 'annotation_value', 'annotation_values' + ); + + $required = array_merge($required, $annotations_required); + break; + + default: + return false; + } + + foreach ($required as $key) { + // check that it exists and is something. + if (isset($options[$key]) && $options[$key]) { + return true; + } + } + + return false; +} + +/** + * Intercepts the index page when Walled Garden mode is enabled. + * + * @link http://docs.elgg.org/Tutorials/WalledGarden + * @elgg_plugin_hook index system + * + * @param string $hook The name of the hook + * @param string $type The type of hook + * @param bool $value Has a plugin already rendered an index page? + * @param array $params Array of parameters (should be empty) + * @return bool + * @access private + */ +function elgg_walled_garden_index($hook, $type, $value, $params) { + if ($value) { + // do not create a second index page so return + return; + } + + elgg_load_css('elgg.walled_garden'); + elgg_load_js('elgg.walled_garden'); + + $content = elgg_view('core/walled_garden/login'); + + $params = array( + 'content' => $content, + 'class' => 'elgg-walledgarden-double', + 'id' => 'elgg-walledgarden-login', + ); + $body = elgg_view_layout('walled_garden', $params); + echo elgg_view_page('', $body, 'walled_garden'); + + // return true to prevent other plugins from adding a front page + return true; +} + +/** + * Serve walled garden sections + * + * @param array $page Array of URL segments + * @return string + * @access private + */ +function _elgg_walled_garden_ajax_handler($page) { + $view = $page[0]; + $params = array( + 'content' => elgg_view("core/walled_garden/$view"), + 'class' => 'elgg-walledgarden-single hidden', + 'id' => str_replace('_', '-', "elgg-walledgarden-$view"), + ); + echo elgg_view_layout('walled_garden', $params); + return true; +} + +/** + * Checks the status of the Walled Garden and forwards to a login page + * if required. + * + * If the site is in Walled Garden mode, all page except those registered as + * plugin pages by {@elgg_hook public_pages walled_garden} will redirect to + * a login page. + * + * @since 1.8.0 + * @elgg_event_handler init system + * @link http://docs.elgg.org/Tutorials/WalledGarden + * @return void + * @access private + */ +function elgg_walled_garden() { + global $CONFIG; + + elgg_register_css('elgg.walled_garden', '/css/walled_garden.css'); + elgg_register_js('elgg.walled_garden', '/js/walled_garden.js'); + + elgg_register_page_handler('walled_garden', '_elgg_walled_garden_ajax_handler'); + + // check for external page view + if (isset($CONFIG->site) && $CONFIG->site instanceof ElggSite) { + $CONFIG->site->checkWalledGarden(); + } +} + +/** + * Remove public access for walled gardens + * + * @param string $hook + * @param string $type + * @param array $accesses + * @return array + * @access private + */ +function _elgg_walled_garden_remove_public_access($hook, $type, $accesses) { + if (isset($accesses[ACCESS_PUBLIC])) { + unset($accesses[ACCESS_PUBLIC]); + } + return $accesses; +} + +/** + * Boots the engine + * + * 1. sets error handlers + * 2. connects to database + * 3. verifies the installation suceeded + * 4. loads application configuration + * 5. loads i18n data + * 6. loads site configuration + * + * @access private + */ +function _elgg_engine_boot() { + // Register the error handlers + set_error_handler('_elgg_php_error_handler'); + set_exception_handler('_elgg_php_exception_handler'); + + setup_db_connections(); + + verify_installation(); + + _elgg_load_application_config(); + + _elgg_load_site_config(); + + _elgg_session_boot(); + + _elgg_load_cache(); + + _elgg_load_translations(); +} + +/** + * Elgg's main init. + * + * Handles core actions for comments, the JS pagehandler, and the shutdown function. + * + * @elgg_event_handler init system + * @return void + * @access private + */ +function elgg_init() { + global $CONFIG; + + elgg_register_action('comments/add'); + elgg_register_action('comments/delete'); + + elgg_register_page_handler('js', 'elgg_js_page_handler'); + elgg_register_page_handler('css', 'elgg_css_page_handler'); + elgg_register_page_handler('ajax', 'elgg_ajax_page_handler'); + + elgg_register_js('elgg.autocomplete', 'js/lib/ui.autocomplete.js'); + elgg_register_js('jquery.ui.autocomplete.html', 'vendors/jquery/jquery.ui.autocomplete.html.js'); + elgg_register_js('elgg.userpicker', 'js/lib/ui.userpicker.js'); + elgg_register_js('elgg.friendspicker', 'js/lib/ui.friends_picker.js'); + elgg_register_js('jquery.easing', 'vendors/jquery/jquery.easing.1.3.packed.js'); + elgg_register_js('elgg.avatar_cropper', 'js/lib/ui.avatar_cropper.js'); + elgg_register_js('jquery.imgareaselect', 'vendors/jquery/jquery.imgareaselect-0.9.8/scripts/jquery.imgareaselect.min.js'); + elgg_register_js('elgg.ui.river', 'js/lib/ui.river.js'); + + elgg_register_css('jquery.imgareaselect', 'vendors/jquery/jquery.imgareaselect-0.9.8/css/imgareaselect-deprecated.css'); + + // Trigger the shutdown:system event upon PHP shutdown. + register_shutdown_function('_elgg_shutdown_hook'); + + $logo_url = elgg_get_site_url() . "_graphics/elgg_toolbar_logo.gif"; + elgg_register_menu_item('topbar', array( + 'name' => 'elgg_logo', + 'href' => 'http://www.elgg.org/', + 'text' => "<img src=\"$logo_url\" alt=\"Elgg logo\" width=\"38\" height=\"20\" />", + 'priority' => 1, + 'link_class' => 'elgg-topbar-logo', + )); + + // Sets a blacklist of words in the current language. + // This is a comma separated list in word:blacklist. + // @todo possibly deprecate + $CONFIG->wordblacklist = array(); + $list = explode(',', elgg_echo('word:blacklist')); + if ($list) { + foreach ($list as $l) { + $CONFIG->wordblacklist[] = trim($l); + } + } +} + +/** + * Adds unit tests for the general API. + * + * @param string $hook unit_test + * @param string $type system + * @param array $value array of test files + * @param array $params empty + * + * @elgg_plugin_hook unit_tests system + * @return void + * @access private + */ +function elgg_api_test($hook, $type, $value, $params) { + global $CONFIG; + $value[] = $CONFIG->path . 'engine/tests/api/entity_getter_functions.php'; + $value[] = $CONFIG->path . 'engine/tests/api/helpers.php'; + $value[] = $CONFIG->path . 'engine/tests/regression/trac_bugs.php'; + return $value; +} + +/**#@+ + * Controlls access levels on ElggEntity entities, metadata, and annotations. + * + * @var int + */ +define('ACCESS_DEFAULT', -1); +define('ACCESS_PRIVATE', 0); +define('ACCESS_LOGGED_IN', 1); +define('ACCESS_PUBLIC', 2); +define('ACCESS_FRIENDS', -2); +/**#@-*/ + +/** + * Constant to request the value of a parameter be ignored in elgg_get_*() functions + * + * @see elgg_get_entities() + * @var NULL + * @since 1.7 + */ +define('ELGG_ENTITIES_ANY_VALUE', NULL); + +/** + * Constant to request the value of a parameter be nothing in elgg_get_*() functions. + * + * @see elgg_get_entities() + * @var int 0 + * @since 1.7 + */ +define('ELGG_ENTITIES_NO_VALUE', 0); + +/** + * Used in calls to forward() to specify the browser should be redirected to the + * referring page. + * + * @see forward + * @var unknown_type + */ +define('REFERRER', -1); + +/** + * Alternate spelling for REFERRER. Included because of some bad documentation + * in the original HTTP spec. + * + * @see forward() + * @link http://en.wikipedia.org/wiki/HTTP_referrer#Origin_of_the_term_referer + * @var int -1 + */ +define('REFERER', -1); + +elgg_register_event_handler('init', 'system', 'elgg_init'); +elgg_register_event_handler('boot', 'system', '_elgg_engine_boot', 1); +elgg_register_plugin_hook_handler('unit_test', 'system', 'elgg_api_test'); + +elgg_register_event_handler('init', 'system', 'add_custom_menu_items', 1000); +elgg_register_event_handler('init', 'system', 'elgg_walled_garden', 1000); |