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410
content/inc/Remote/Api.php
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410
content/inc/Remote/Api.php
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<?php
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namespace dokuwiki\Remote;
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use dokuwiki\Extension\Event;
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use dokuwiki\Extension\RemotePlugin;
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/**
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* This class provides information about remote access to the wiki.
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*
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* == Types of methods ==
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* There are two types of remote methods. The first is the core methods.
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* These are always available and provided by dokuwiki.
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* The other is plugin methods. These are provided by remote plugins.
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*
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* == Information structure ==
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* The information about methods will be given in an array with the following structure:
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* array(
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* 'method.remoteName' => array(
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* 'args' => array(
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* 'type eg. string|int|...|date|file',
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* )
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* 'name' => 'method name in class',
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* 'return' => 'type',
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* 'public' => 1/0 - method bypass default group check (used by login)
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* ['doc' = 'method documentation'],
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* )
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* )
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*
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* plugin names are formed the following:
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* core methods begin by a 'dokuwiki' or 'wiki' followed by a . and the method name itself.
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* i.e.: dokuwiki.version or wiki.getPage
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*
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* plugin methods are formed like 'plugin.<plugin name>.<method name>'.
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* i.e.: plugin.clock.getTime or plugin.clock_gmt.getTime
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*/
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class Api
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{
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/**
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* @var ApiCore
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*/
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private $coreMethods = null;
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/**
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* @var array remote methods provided by dokuwiki plugins - will be filled lazy via
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* {@see dokuwiki\Remote\RemoteAPI#getPluginMethods}
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*/
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private $pluginMethods = null;
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/**
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* @var array contains custom calls to the api. Plugins can use the XML_CALL_REGISTER event.
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* The data inside is 'custom.call.something' => array('plugin name', 'remote method name')
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*
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* The remote method name is the same as in the remote name returned by _getMethods().
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*/
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private $pluginCustomCalls = null;
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private $dateTransformation;
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private $fileTransformation;
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/**
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* constructor
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*/
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public function __construct()
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{
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$this->dateTransformation = array($this, 'dummyTransformation');
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$this->fileTransformation = array($this, 'dummyTransformation');
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}
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/**
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* Get all available methods with remote access.
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*
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* @return array with information to all available methods
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* @throws RemoteException
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*/
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public function getMethods()
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{
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return array_merge($this->getCoreMethods(), $this->getPluginMethods());
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}
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/**
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* Call a method via remote api.
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*
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* @param string $method name of the method to call.
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* @param array $args arguments to pass to the given method
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* @return mixed result of method call, must be a primitive type.
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* @throws RemoteException
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*/
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public function call($method, $args = array())
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{
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if ($args === null) {
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$args = array();
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}
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list($type, $pluginName, /* $call */) = explode('.', $method, 3);
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if ($type === 'plugin') {
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return $this->callPlugin($pluginName, $method, $args);
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}
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if ($this->coreMethodExist($method)) {
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return $this->callCoreMethod($method, $args);
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}
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return $this->callCustomCallPlugin($method, $args);
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}
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/**
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* Check existance of core methods
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*
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* @param string $name name of the method
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* @return bool if method exists
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*/
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private function coreMethodExist($name)
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{
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$coreMethods = $this->getCoreMethods();
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return array_key_exists($name, $coreMethods);
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}
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/**
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* Try to call custom methods provided by plugins
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*
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* @param string $method name of method
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* @param array $args
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* @return mixed
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* @throws RemoteException if method not exists
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*/
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private function callCustomCallPlugin($method, $args)
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{
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$customCalls = $this->getCustomCallPlugins();
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if (!array_key_exists($method, $customCalls)) {
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throw new RemoteException('Method does not exist', -32603);
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}
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$customCall = $customCalls[$method];
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return $this->callPlugin($customCall[0], $customCall[1], $args);
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}
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/**
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* Returns plugin calls that are registered via RPC_CALL_ADD action
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*
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* @return array with pairs of custom plugin calls
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* @triggers RPC_CALL_ADD
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*/
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private function getCustomCallPlugins()
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{
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if ($this->pluginCustomCalls === null) {
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$data = array();
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Event::createAndTrigger('RPC_CALL_ADD', $data);
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$this->pluginCustomCalls = $data;
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}
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return $this->pluginCustomCalls;
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}
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/**
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* Call a plugin method
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*
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* @param string $pluginName
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* @param string $method method name
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* @param array $args
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* @return mixed return of custom method
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* @throws RemoteException
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*/
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private function callPlugin($pluginName, $method, $args)
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{
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$plugin = plugin_load('remote', $pluginName);
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$methods = $this->getPluginMethods();
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if (!$plugin) {
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throw new RemoteException('Method does not exist', -32603);
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}
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$this->checkAccess($methods[$method]);
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$name = $this->getMethodName($methods, $method);
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try {
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set_error_handler(array($this, "argumentWarningHandler"), E_WARNING); // for PHP <7.1
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return call_user_func_array(array($plugin, $name), $args);
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} catch (\ArgumentCountError $th) {
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throw new RemoteException('Method does not exist - wrong parameter count.', -32603);
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} finally {
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restore_error_handler();
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}
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}
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/**
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* Call a core method
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*
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* @param string $method name of method
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* @param array $args
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* @return mixed
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* @throws RemoteException if method not exist
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*/
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private function callCoreMethod($method, $args)
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{
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$coreMethods = $this->getCoreMethods();
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$this->checkAccess($coreMethods[$method]);
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if (!isset($coreMethods[$method])) {
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throw new RemoteException('Method does not exist', -32603);
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}
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$this->checkArgumentLength($coreMethods[$method], $args);
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try {
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set_error_handler(array($this, "argumentWarningHandler"), E_WARNING); // for PHP <7.1
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return call_user_func_array(array($this->coreMethods, $this->getMethodName($coreMethods, $method)), $args);
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} catch (\ArgumentCountError $th) {
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throw new RemoteException('Method does not exist - wrong parameter count.', -32603);
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} finally {
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restore_error_handler();
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}
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}
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/**
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* Check if access should be checked
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*
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* @param array $methodMeta data about the method
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* @throws AccessDeniedException
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*/
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private function checkAccess($methodMeta)
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{
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if (!isset($methodMeta['public'])) {
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$this->forceAccess();
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} else {
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if ($methodMeta['public'] == '0') {
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$this->forceAccess();
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}
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}
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}
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/**
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* Check the number of parameters
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*
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* @param array $methodMeta data about the method
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* @param array $args
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* @throws RemoteException if wrong parameter count
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*/
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private function checkArgumentLength($methodMeta, $args)
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{
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if (count($methodMeta['args']) < count($args)) {
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throw new RemoteException('Method does not exist - wrong parameter count.', -32603);
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}
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}
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/**
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* Determine the name of the real method
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*
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* @param array $methodMeta list of data of the methods
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* @param string $method name of method
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* @return string
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*/
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private function getMethodName($methodMeta, $method)
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{
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if (isset($methodMeta[$method]['name'])) {
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return $methodMeta[$method]['name'];
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}
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$method = explode('.', $method);
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return $method[count($method) - 1];
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}
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/**
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* Perform access check for current user
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*
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* @return bool true if the current user has access to remote api.
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* @throws AccessDeniedException If remote access disabled
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*/
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public function hasAccess()
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{
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global $conf;
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global $USERINFO;
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/** @var \dokuwiki\Input\Input $INPUT */
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global $INPUT;
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if (!$conf['remote']) {
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throw new AccessDeniedException('server error. RPC server not enabled.', -32604);
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}
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if (trim($conf['remoteuser']) == '!!not set!!') {
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return false;
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}
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if (!$conf['useacl']) {
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return true;
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}
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if (trim($conf['remoteuser']) == '') {
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return true;
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}
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return auth_isMember($conf['remoteuser'], $INPUT->server->str('REMOTE_USER'), (array) $USERINFO['grps']);
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}
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/**
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* Requests access
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*
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* @return void
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* @throws AccessDeniedException On denied access.
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*/
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public function forceAccess()
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{
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if (!$this->hasAccess()) {
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throw new AccessDeniedException('server error. not authorized to call method', -32604);
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}
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}
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/**
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* Collects all the methods of the enabled Remote Plugins
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*
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* @return array all plugin methods.
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* @throws RemoteException if not implemented
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*/
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public function getPluginMethods()
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{
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if ($this->pluginMethods === null) {
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$this->pluginMethods = array();
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$plugins = plugin_list('remote');
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foreach ($plugins as $pluginName) {
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/** @var RemotePlugin $plugin */
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$plugin = plugin_load('remote', $pluginName);
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if (!is_subclass_of($plugin, 'dokuwiki\Extension\RemotePlugin')) {
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throw new RemoteException(
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"Plugin $pluginName does not implement dokuwiki\Plugin\DokuWiki_Remote_Plugin"
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);
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}
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try {
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$methods = $plugin->_getMethods();
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} catch (\ReflectionException $e) {
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throw new RemoteException('Automatic aggregation of available remote methods failed', 0, $e);
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}
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foreach ($methods as $method => $meta) {
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$this->pluginMethods["plugin.$pluginName.$method"] = $meta;
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}
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}
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}
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return $this->pluginMethods;
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}
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/**
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* Collects all the core methods
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*
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* @param ApiCore $apiCore this parameter is used for testing. Here you can pass a non-default RemoteAPICore
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* instance. (for mocking)
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* @return array all core methods.
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*/
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public function getCoreMethods($apiCore = null)
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{
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if ($this->coreMethods === null) {
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if ($apiCore === null) {
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$this->coreMethods = new ApiCore($this);
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} else {
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$this->coreMethods = $apiCore;
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}
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}
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return $this->coreMethods->__getRemoteInfo();
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}
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/**
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* Transform file to xml
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*
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* @param mixed $data
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* @return mixed
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*/
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public function toFile($data)
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{
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return call_user_func($this->fileTransformation, $data);
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}
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/**
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* Transform date to xml
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*
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* @param mixed $data
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* @return mixed
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*/
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public function toDate($data)
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{
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return call_user_func($this->dateTransformation, $data);
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}
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/**
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* A simple transformation
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*
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* @param mixed $data
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* @return mixed
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*/
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public function dummyTransformation($data)
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{
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return $data;
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}
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/**
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* Set the transformer function
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*
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* @param callback $dateTransformation
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*/
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public function setDateTransformation($dateTransformation)
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{
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$this->dateTransformation = $dateTransformation;
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}
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/**
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* Set the transformer function
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*
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* @param callback $fileTransformation
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*/
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public function setFileTransformation($fileTransformation)
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{
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$this->fileTransformation = $fileTransformation;
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}
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/**
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* The error handler that catches argument-related warnings
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*/
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public function argumentWarningHandler($errno, $errstr)
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{
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if (substr($errstr, 0, 17) == 'Missing argument ') {
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throw new RemoteException('Method does not exist - wrong parameter count.', -32603);
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}
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}
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}
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