mirror of
https://git.code.sf.net/p/seeddms/code
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308 lines
10 KiB
PHP
308 lines
10 KiB
PHP
<?php
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// SeedDMS. Document Management System
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// Copyright (C) 2013 Uwe Steinmann
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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class SeedDMS_Controller_Common {
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/**
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* @var array $params list of parameters
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* @access protected
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*/
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protected $params;
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/**
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* @var integer $error error number of last run
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* @access protected
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*/
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protected $error;
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/**
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* @var string $errormsg error message of last run
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* @access protected
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*/
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protected $errormsg;
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/**
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* @var mixed $lasthookresult result of last hook
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* @access protected
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*/
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protected $lasthookresult;
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function __construct($params) {
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$this->params = $params;
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$this->error = 0;
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$this->errormsg = '';
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}
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/**
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* Call methods with name in $get['action']
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*
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* @params array $get $_GET or $_POST variables
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* @return mixed return value of called method
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*/
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function __invoke($get=array()) {
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$this->callHook('preRun', isset($get['action']) ? $get['action'] : 'run');
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if(isset($get['action']) && $get['action']) {
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if(method_exists($this, $get['action'])) {
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return $this->{$get['action']}();
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} else {
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echo "Missing action '".$get['action']."'";
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return false;
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}
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} else
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return $this->run();
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$this->callHook('postRun', isset($get['action']) ? $get['action'] : 'run');
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}
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function setParams($params) {
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$this->params = $params;
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}
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function setParam($name, $value) {
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$this->params[$name] = $value;
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}
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/**
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* Return value of a parameter with the given name
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*
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* This function may return null if the parameter does not exist or
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* has a value of null. If in doubt call hasParam() to check if the
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* parameter exists.
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*
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* @param string $name name of parameter
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* @return mixed value of parameter or null if parameter does not exist
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*/
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function getParam($name) {
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return isset($this->params[$name]) ? $this->params[$name] : null;
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}
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/**
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* Check if the controller has a parameter with the given name
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*
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* @param string $name name of parameter
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* @return boolean true if parameter exists otherwise false
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*/
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function hasParam($name) {
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return isset($this->params[$name]) ? true : false;
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}
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/**
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* Remove a parameter with the given name
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*
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* @param string $name name of parameter
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*/
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function unsetParam($name) {
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if(isset($this->params[$name]))
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unset($this->params[$name]);
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}
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function run() {
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}
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/**
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* Get error number of last run
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*
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* @return integer error number
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*/
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public function getErrorNo() { /* {{{ */
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return $this->error;
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} /* }}} */
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/**
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* Get error message of last run
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*
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* @return string error message
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*/
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public function getErrorMsg() { /* {{{ */
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return $this->errormsg;
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} /* }}} */
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/**
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* Set error message
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*
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* @param string $msg error message
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*/
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public function setErrorMsg($msg) { /* {{{ */
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$this->errormsg = $msg;
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} /* }}} */
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/**
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* Return a list of hook classes for the current class
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*
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* Hooks are associated to a controller class. Calling a hook with
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* SeedDMS_View_Common::callHook() will run through a list of
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* controller classes searching for the hook. This method returns this
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* list.
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*
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* If a controller is implemented in SeedDMS_View_Example which inherits
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* from SeedDMS_Theme_Style which again inherits from SeedDMS_View_Common,
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* then this method will return an array with the elments:
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* 'Example', 'Style', 'Common'. If SeedDMS_View_Example also sets
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* the class property 'controllerAliasName', then this value will be added
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* to the beginning of the list.
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*
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* When a hook is called, it will run through this list and checks
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* if $GLOBALS['SEEDDMS_HOOKS']['controller'][<element>] exists and contains
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* an instanciated class. This class must implement the hook.
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*
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* @return array list of controller class names.
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*/
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protected function getHookClassNames() { /* {{{ */
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$tmps = array();
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/* the controllerAliasName can be set in the controller to specify a different name
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* than extracted from the class name.
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*/
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if(property_exists($this, 'controllerAliasName') && !empty($this->controllerAliasName)) {
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$tmps[] = $this->controllerAliasName;
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}
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$tmp = explode('_', get_class($this));
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$tmps[] = $tmp[2];
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foreach(class_parents($this) as $pc) {
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$tmp = explode('_', $pc);
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$tmps[] = $tmp[2];
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}
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/* Run array_unique() in case the parent class has the same suffix */
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$tmps = array_unique($tmps);
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return $tmps;
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} /* }}} */
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/**
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* Call all hooks registered for a controller
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*
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* Executes all hooks registered for the current controller.
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* A hook is just a php function which is passed the current controller and
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* additional paramaters passed to this method.
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*
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* If a hook returns false, then no other hook will be called, because this
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* method returns right away. If hook returns null, then this is treated like
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* it was never called and the next hook is called. Any other value
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* returned by a hook will be temporarily saved (possibly overwriting a value
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* from a previously called hook) and the next hook is called.
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* The temporarily saved return value is eventually returned by this method
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* when all hooks are called and no following hook failed.
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* The temporarily saved return value is also saved in a protected class
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* variable $lasthookresult which is initialized to null. This could be used
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* by following hooks to check if preceding hook did already succeed.
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*
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* Consider that a failing hook (returns false) will imediately quit this
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* function an return false, even if a formerly called hook has succeeded.
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* Also consider, that a second succeeding hook will overwrite the return value
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* of a previously called hook.
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* Third, keep in mind that there is no predefined order of hooks.
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*
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* Example 1: Assuming the hook 'loginRestrictions' in the 'Login' controller
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* is implemented by two extensions.
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* One extension restricts login to a certain time of the day and a second one
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* checks the strength of the password. If the password strength is to low, it
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* will prevent login. If the hook in the first extension allows login (returns true)
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* and the second doesn't (returns false), then this method will return false.
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* If the hook in the second extension doesn't care and therefore returns null, then
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* this method will return true.
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*
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* Example 2: Assuming the hook 'authenticate' in the 'Login' controller
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* is implemented by two extensions. This hook must return false if authentication
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* fails, null if the hook does not care, or a
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* valid user in case of a successful authentication.
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* If the first extension is able to authenticate the user, the hook in the second
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* extension will still be called and could fail. So the return value of this
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* method is false. The second hook could actually succeed as well and return a
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* different user than the first hook which will eventually be returned by this
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* method. The last hook will always win. If you need to know if a previously
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* called hook succeeded, you can check the class variable $lasthookresult in the
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* hook.
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*
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* @param $hook string name of hook
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* @return mixed false if one of the hooks fails,
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* true/value if all hooks succedded,
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* null if no hook was called
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*/
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function callHook($hook) { /* {{{ */
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$tmps = $this->getHookClassNames();
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foreach($tmps as $tmp)
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if(isset($GLOBALS['SEEDDMS_HOOKS']['controller'][lcfirst($tmp)])) {
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$this->lasthookresult = null;
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foreach($GLOBALS['SEEDDMS_HOOKS']['controller'][lcfirst($tmp)] as $hookObj) {
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if (method_exists($hookObj, $hook)) {
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switch(func_num_args()) {
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case 4:
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$result = $hookObj->$hook($this, func_get_arg(1), func_get_arg(2), func_get_arg(3));
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break;
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case 3:
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$result = $hookObj->$hook($this, func_get_arg(1), func_get_arg(2));
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break;
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case 2:
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$result = $hookObj->$hook($this, func_get_arg(1));
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break;
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case 1:
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default:
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$result = $hookObj->$hook($this);
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}
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if($result === false) {
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return $result;
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}
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if($result !== null) {
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$this->lasthookresult = $result;
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}
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}
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}
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return $this->lasthookresult;
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}
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return null;
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} /* }}} */
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/**
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* Check if a hook is registered
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*
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* @param $hook string name of hook
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* @return mixed false if one of the hooks fails,
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* true if all hooks succedded,
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* null if no hook was called
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*/
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function hasHook($hook) { /* {{{ */
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$tmps = $this->getHookClassNames();
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if(isset($GLOBALS['SEEDDMS_HOOKS']['controller'][lcfirst($tmp[2])])) {
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foreach($GLOBALS['SEEDDMS_HOOKS']['controller'][lcfirst($tmp[2])] as $hookObj) {
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if (method_exists($hookObj, $hook)) {
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return true;
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}
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}
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}
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return false;
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} /* }}} */
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/**
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* Check if the access on the contoller with given name or the current
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* controller itself may be accessed.
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*
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* The function requires the parameter 'accessobject' to be available in the
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* controller, because it calls SeedDMS_AccessOperation::check_controller_access()
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* to check access rights. If the the optional $name is not set the
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* current controller is used.
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*
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* @param string|array $name name of controller or list of controller names
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* @return boolean true if access is allowed otherwise false
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*/
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protected function check_access($name='') { /* {{{ */
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if(!$name)
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$name = $this;
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if(!isset($this->params['accessobject']))
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return false;
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$access = $this->params['accessobject']->check_controller_access($name);
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return $access;
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} /* }}} */
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}
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