source: inc/core/class.dc.modules.php @ 3395:445e9ff79a1f

<?php
# -- BEGIN LICENSE BLOCK ---------------------------------------
#
# This file is part of Dotclear 2.
#
# Copyright (c) 2003-2013 Olivier Meunier & Association Dotclear
# Licensed under the GPL version 2.0 license.
# See LICENSE file or
# http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
#
# -- END LICENSE BLOCK -----------------------------------------
if (!defined('DC_RC_PATH')) { return; }

/**
@ingroup DC_CORE
@brief Modules handler

Provides an object to handle modules (themes or plugins).
*/
class dcModules
{
     protected $path;
     protected $ns;
     protected $modules = array();
     protected $disabled = array();
     protected $errors = array();
     protected $modules_names = array();
     protected $all_modules = array();
     protected $disabled_mode = false;
     protected $disabled_meta = array();
     protected $to_disable = array();

     protected $id;
     protected $mroot;

     # Inclusion variables
     protected static $superglobals = array('GLOBALS','_SERVER','_GET','_POST','_COOKIE','_FILES','_ENV','_REQUEST','_SESSION');
     protected static $_k;
     protected static $_n;

     protected static $type = null;

     public $core;  ///< <b>dcCore</b>  dcCore instance

     /**
     Object constructor.

     @param    core      <b>dcCore</b>  dcCore instance
     */
     public function __construct($core)
     {
          $this->core =& $core;
     }

     /**
      * Checks all modules dependencies
      *   Fills in the following information in module :
      *     * cannot_enable : list reasons why module cannot be enabled. Not set if module can be enabled
      *     * cannot_disable : list reasons why module cannot be disabled. Not set if module can be disabled
      *     * implies : reverse dependencies
      * @return array list of enabled modules with unmet dependencies, and that must be disabled.
      */
     public function checkDependencies()
     {
          $dc_version = preg_replace('/\-dev$/','',DC_VERSION);
          $this->to_disable = array();
          foreach ($this->all_modules as $k => &$m) {
               if (isset($m['requires'])) {
                    $missing = array();
                    foreach ($m['requires'] as &$dep) {
                         if (!is_array($dep)) {
                              $dep = array($dep);
                         }
                         // grab missing dependencies
                         if (!isset($this->all_modules[$dep[0]]) && ($dep[0] != 'core')) {
                              // module not present
                              $missing[$dep[0]] = sprintf(__("Requires %s module which is not installed"), $dep[0]);
                         } elseif ((count($dep) > 1) &&
                              version_compare(($dep[0] == 'core' ? $dc_version : $this->all_modules[$dep[0]]['version']),$dep[1]) == -1)
                         {
                              // module present, but version missing
                              if ($dep[0] == 'core') {
                                   $missing[$dep[0]] = sprintf(__("Requires Dotclear version %s, but version %s is installed"),
                                   $dep[1],$dc_version);
                              } else {
                                   $missing[$dep[0]] = sprintf(__("Requires %s module version %s, but version %s is installed"),
                                   $dep[0],$dep[1],$this->all_modules[$dep[0]]['version']);
                              }
                         } elseif (($dep[0] != 'core') && !$this->all_modules[$dep[0]]['enabled']) {
                              // module disabled
                              $missing[$dep[0]] = sprintf(__("Requires %s module which is disabled"), $dep[0]);
                         }
                         $this->all_modules[$dep[0]]['implies'][]=$k;
                    }
                    if (count($missing)) {
                         $m['cannot_enable']=$missing;
                         if ($m['enabled']) {
                              $this->to_disable[]=array('name' => $k,'reason'=> $missing);
                         }
                    }
               }
          }
          // Check modules that cannot be disabled
          foreach ($this->modules as $k => &$m) {
               if (isset($m['implies']) && $m['enabled']) {
                    foreach ($m['implies'] as $im) {
                         if (isset($this->all_modules[$im]) && $this->all_modules[$im]['enabled']) {
                              $m['cannot_disable'][]=$im;
                         }
                    }
               }
          }
     }

     /**
      * Checks all modules dependencies, and disable unmet dependencies
      * @param  string $redir_url URL to redirect if modules are to disable
      * @return boolean, true if a redirection has been performed
      */
     public function disableDepModules($redir_url)
     {
          if (isset($_GET['dep'])) {
               // Avoid infinite redirects
               return false;
          }
          $reason = array();
          foreach ($this->to_disable as $module) {
               try{
                    $this->deactivateModule($module['name']);
                    $reason[] = sprintf("<li>%s : %s</li>",$module['name'],join(',',$module['reason']));
               } catch (Exception $e) {
               }
          }
          if (count($reason)) {
               $message = sprintf ("<p>%s</p><ul>%s</ul>",
                    __('The following extensions have been disabled :'),
                    join('',$reason)
               );
               dcPage::addWarningNotice($message,array('divtag' => true,'with_ts' => false));
               $url = $redir_url.(strpos($redir_url,"?") ? '&' : '?').'dep=1';
               http::redirect($url);
               return true;
          }
          return false;
     }

     /**
     Loads modules. <var>$path</var> could be a separated list of paths
     (path separator depends on your OS).

     <var>$ns</var> indicates if an additionnal file needs to be loaded on plugin
     load, value could be:
     - admin (loads module's _admin.php)
     - public (loads module's _public.php)
     - xmlrpc (loads module's _xmlrpc.php)

     <var>$lang</var> indicates if we need to load a lang file on plugin
     loading.
     */
     public function loadModules($path,$ns=null,$lang=null)
     {
          $this->path = explode(PATH_SEPARATOR,$path);
          $this->ns = $ns;

          $disabled = isset($_SESSION['sess_safe_mode']) && $_SESSION['sess_safe_mode'];
          $disabled = $disabled && !get_parent_class($this) ? true : false;

          $ignored = array();

          foreach ($this->path as $root)
          {
               if (!is_dir($root) || !is_readable($root)) {
                    continue;
               }

               if (substr($root,-1) != '/') {
                    $root .= '/';
               }

               if (($d = @dir($root)) === false) {
                    continue;
               }

               while (($entry = $d->read()) !== false)
               {
                    $full_entry = $root.$entry;

                    if ($entry != '.' && $entry != '..' && is_dir($full_entry)
                    && file_exists($full_entry.'/_define.php'))
                    {
                         if (!file_exists($full_entry.'/_disabled') && !$disabled)
                         {
                              $this->id = $entry;
                              $this->mroot = $full_entry;
                              ob_start();
                              require $full_entry.'/_define.php';
                              ob_end_clean();
                              $this->all_modules[$entry] =& $this->modules[$entry];
                              $this->id = null;
                              $this->mroot = null;
                         }
                         else
                         {
                              if (file_exists($full_entry.'/_define.php')) {
                                   $this->id = $entry;
                                   $this->mroot = $full_entry;
                                   $this->disabled_mode = true;
                                   ob_start();
                                   require $full_entry.'/_define.php';
                                   ob_end_clean();
                                   $this->disabled_mode = false;
                                   $this->disabled[$entry] =  $this->disabled_meta;
                                   $this->all_modules[$entry] =& $this->disabled[$entry];
                                   $this->id = null;
                                   $this->mroot = null;
                              }
                         }
                    }
               }
               $d->close();
          }
          $this->checkDependencies();
          # Sort plugins
          uasort($this->modules,array($this,'sortModules'));

          foreach ($this->modules as $id => $m)
          {
               # Load translation and _prepend
               if (file_exists($m['root'].'/_prepend.php'))
               {
                    $r = $this->loadModuleFile($m['root'].'/_prepend.php');

                    # If _prepend.php file returns null (ie. it has a void return statement)
                    if (is_null($r)) {
                         $ignored[] = $id;
                         continue;
                    }
                    unset($r);
               }

               $this->loadModuleL10N($id,$lang,'main');
               if ($ns == 'admin') {
                    $this->loadModuleL10Nresources($id,$lang);
                    $this->core->adminurl->register('admin.plugin.'.$id,'plugin.php',array('p'=>$id));
               }
          }

          // Give opportunity to do something before loading context (admin,public,xmlrpc) files
          $this->core->callBehavior('coreBeforeLoadingNsFiles',$this->core,$this,$lang);

          foreach ($this->modules as $id => $m)
          {
               # If _prepend.php file returns null (ie. it has a void return statement)
               if (in_array($id,$ignored)) {
                    continue;
               }
               # Load ns_file
               $this->loadNsFile($id,$ns);
          }
     }

     public function requireDefine($dir,$id)
     {
          if (file_exists($dir.'/_define.php')) {
               $this->id = $id;
               ob_start();
               require $dir.'/_define.php';
               ob_end_clean();
               $this->id = null;
          }
     }

     /**
     This method registers a module in modules list. You should use this to
     register a new module.

     <var>$permissions</var> is a comma separated list of permissions for your
     module. If <var>$permissions</var> is null, only super admin has access to
     this module.

     <var>$priority</var> is an integer. Modules are sorted by priority and name.
     Lowest priority comes first.

     @param    name           <b>string</b>       Module name
     @param    desc           <b>string</b>       Module description
     @param    author         <b>string</b>       Module author name
     @param    version        <b>string</b>       Module version
     @param    properties     <b>array</b>        extra properties
     (currently available keys : permissions, priority, type)
     */
     public function registerModule($name,$desc,$author,$version,$properties = array())
     {
          if ($this->disabled_mode) {
               $this->disabled_meta = array_merge(
                         $properties,
                         array(
                              'root' => $this->mroot,
                              'name' => $name,
                              'desc' => $desc,
                              'author' => $author,
                              'version' => $version,
                              'enabled' => false,
                              'root_writable' => is_writable($this->mroot)
                         )
                    );
               return;
          }
          # Fallback to legacy registerModule parameters
          if (!is_array($properties)) {
               $args = func_get_args();
               $properties = array();
               if (isset($args[4])) {
                    $properties['permissions']=$args[4];
               }
               if (isset($args[5])) {
                    $properties['priority']= (integer)$args[5];
               }
          }

          # Default module properties
          $properties = array_merge(
               array(
                    'permissions' => null,
                    'priority' => 1000,
                    'standalone_config' => false,
                    'type' => null,
                    'enabled' => true,
                    'requires' => array(),
                    'settings' => array()
               ), $properties
          );

          # Check module type
          if (self::$type !== null && $properties['type'] !== null && $properties['type'] != self::$type) {
               $this->errors[] = sprintf(
                    __('Module "%s" has type "%s" that mismatch required module type "%s".'),
                    '<strong>'.html::escapeHTML($name).'</strong>',
                    '<em>'.html::escapeHTML($properties['type']).'</em>',
                    '<em>'.html::escapeHTML(self::$type).'</em>'
               );
               return;
          }

          # Check module perms on admin side
          $permissions = $properties['permissions'];
          if ($this->ns == 'admin') {
               if ($permissions == '' && !$this->core->auth->isSuperAdmin()) {
                    return;
               } elseif (!$this->core->auth->check($permissions,$this->core->blog->id)) {
                    return;
               }
          }

          # Check module install on multiple path
          if ($this->id) {
               $module_exists = array_key_exists($name,$this->modules_names);
               $module_overwrite = $module_exists ? version_compare($this->modules_names[$name],$version,'<') : false;
               if (!$module_exists || ($module_exists && $module_overwrite)) {
                    $this->modules_names[$name] = $version;
                    $this->modules[$this->id] = array_merge(
                         $properties,
                         array(
                              'root' => $this->mroot,
                              'name' => $name,
                              'desc' => $desc,
                              'author' => $author,
                              'version' => $version,
                              'root_writable' => is_writable($this->mroot)
                         )
                    );
               }
               else {
                    $path1 = path::real($this->moduleInfo($name,'root'));
                    $path2 = path::real($this->mroot);
                    $this->errors[] = sprintf(
                         __('Module "%s" is installed twice in "%s" and "%s".'),
                         '<strong>'.$name.'</strong>',
                         '<em>'.$path1.'</em>',
                         '<em>'.$path2.'</em>'
                    );
               }
          }
     }

     public function resetModulesList()
     {
          $this->modules = array();
          $this->modules_names = array();
          $this->errors = array();
     }

     public static function installPackage($zip_file,dcModules &$modules)
     {
          $zip = new fileUnzip($zip_file);
          $zip->getList(false,'#(^|/)(__MACOSX|\.svn|\.hg|\.git|\.DS_Store|\.directory|Thumbs\.db)(/|$)#');

          $zip_root_dir = $zip->getRootDir();
          $define = '';
          if ($zip_root_dir != false) {
               $target = dirname($zip_file);
               $destination = $target.'/'.$zip_root_dir;
               $define = $zip_root_dir.'/_define.php';
               $has_define = $zip->hasFile($define);
          } else {
               $target = dirname($zip_file).'/'.preg_replace('/\.([^.]+)$/','',basename($zip_file));
               $destination = $target;
               $define = '_define.php';
               $has_define = $zip->hasFile($define);
          }

          if ($zip->isEmpty()) {
               $zip->close();
               unlink($zip_file);
               throw new Exception(__('Empty module zip file.'));
          }

          if (!$has_define) {
               $zip->close();
               unlink($zip_file);
               throw new Exception(__('The zip file does not appear to be a valid Dotclear module.'));
          }

          $ret_code = 1;

          if (!is_dir($destination))
          {
               try {
                    files::makeDir($destination,true);

                    $sandbox = clone $modules;
                    $zip->unzip($define, $target.'/_define.php');

                    $sandbox->resetModulesList();
                    $sandbox->requireDefine($target,basename($destination));
                    unlink($target.'/_define.php');

                    $new_errors = $sandbox->getErrors();
                    if (!empty($new_errors)) {
                         $new_errors = is_array($new_errors) ? implode(" \n",$new_errors) : $new_errors;
                         throw new Exception($new_errors);
                    }

                    files::deltree($destination);
               }
               catch(Exception $e)
               {
                    $zip->close();
                    unlink($zip_file);
                    files::deltree($destination);
                    throw new Exception($e->getMessage());
               }
          }
          else
          {
               # test for update
               $sandbox = clone $modules;
               $zip->unzip($define, $target.'/_define.php');

               $sandbox->resetModulesList();
               $sandbox->requireDefine($target,basename($destination));
               unlink($target.'/_define.php');
               $new_modules = $sandbox->getModules();

               if (!empty($new_modules))
               {
                    $tmp = array_keys($new_modules);
                    $id = $tmp[0];
                    $cur_module = $modules->getModules($id);
                    if (!empty($cur_module) && (defined('DC_DEV') && DC_DEV === true || dcUtils::versionsCompare($new_modules[$id]['version'], $cur_module['version'], '>', true)))
                    {
                         # delete old module
                         if (!files::deltree($destination)) {
                              throw new Exception(__('An error occurred during module deletion.'));
                         }
                         $ret_code = 2;
                    }
                    else
                    {
                         $zip->close();
                         unlink($zip_file);
                         throw new Exception(sprintf(__('Unable to upgrade "%s". (older or same version)'),basename($destination)));
                    }
               }
               else
               {
                    $zip->close();
                    unlink($zip_file);
                    throw new Exception(sprintf(__('Unable to read new _define.php file')));
               }
          }
          $zip->unzipAll($target);
          $zip->close();
          unlink($zip_file);
          return $ret_code;
     }

     /**
     This method installs all modules having a _install file.

     @see dcModules::installModule
     */
     public function installModules()
     {
          $res = array('success'=>array(),'failure'=>array());
          foreach ($this->modules as $id => &$m)
          {
               $i = $this->installModule($id,$msg);
               if ($i === true) {
                    $res['success'][$id] = true;
               } elseif ($i === false) {
                    $res['failure'][$id] = $msg;
               }
          }

          return $res;
     }

     /**
     This method installs module with ID <var>$id</var> and having a _install
     file. This file should throw exception on failure or true if it installs
     successfully.

     <var>$msg</var> is an out parameter that handle installer message.

     @param    id        <b>string</b>       Module ID
     @param    msg       <b>string</b>       Module installer message
     @return   <b>boolean</b>
     */
     public function installModule($id,&$msg)
     {
          try {
               $i = $this->loadModuleFile($this->modules[$id]['root'].'/_install.php');
               if ($i === true) {
                    return true;
               }
          } catch (Exception $e) {
               $msg = $e->getMessage();
               return false;
          }

          return null;
     }

     public function deleteModule($id,$disabled=false)
     {
          if ($disabled) {
               $p =& $this->disabled;
          } else {
               $p =& $this->modules;
          }

          if (!isset($p[$id])) {
               throw new Exception(__('No such module.'));
          }

          if (!files::deltree($p[$id]['root'])) {
               throw new Exception(__('Cannot remove module files'));
          }
     }

     public function deactivateModule($id)
     {
          if (!isset($this->modules[$id])) {
               throw new Exception(__('No such module.'));
          }

          if (!$this->modules[$id]['root_writable']) {
               throw new Exception(__('Cannot deactivate plugin.'));
          }

          if (@file_put_contents($this->modules[$id]['root'].'/_disabled','')) {
               throw new Exception(__('Cannot deactivate plugin.'));
          }
     }

     public function activateModule($id)
     {
          if (!isset($this->disabled[$id])) {
               throw new Exception(__('No such module.'));
          }

          if (!$this->disabled[$id]['root_writable']) {
               throw new Exception(__('Cannot activate plugin.'));
          }

          if (@unlink($this->disabled[$id]['root'].'/_disabled') === false) {
               throw new Exception(__('Cannot activate plugin.'));
          }
     }

     /**
     This method will search for file <var>$file</var> in language
     <var>$lang</var> for module <var>$id</var>.

     <var>$file</var> should not have any extension.

     @param    id        <b>string</b>       Module ID
     @param    lang      <b>string</b>       Language code
     @param    file      <b>string</b>       File name (without extension)
     */
     public function loadModuleL10N($id,$lang,$file)
     {
          if (!$lang || !isset($this->modules[$id])) {
               return;
          }

          $lfile = $this->modules[$id]['root'].'/locales/%s/%s';
          if (l10n::set(sprintf($lfile,$lang,$file)) === false && $lang != 'en') {
               l10n::set(sprintf($lfile,'en',$file));
          }
     }

     public function loadModuleL10Nresources($id,$lang)
     {
          if (!$lang || !isset($this->modules[$id])) {
               return;
          }

          $f = l10n::getFilePath($this->modules[$id]['root'].'/locales','resources.php',$lang);
          if ($f) {
               $this->loadModuleFile($f);
          }
     }

     /**
     Returns all modules associative array or only one module if <var>$id</var>
     is present.

     @param    id        <b>string</b>       Optionnal module ID
     @return   <b>array</b>
     */
     public function getModules($id=null)
     {
          if ($id && isset($this->modules[$id])) {
               return $this->modules[$id];
          }
          return $this->modules;
     }

     /**
     Returns true if the module with ID <var>$id</var> exists.

     @param    id        <b>string</b>       Module ID
     @return   <b>boolean</b>
     */
     public function moduleExists($id)
     {
          return isset($this->modules[$id]);
     }

     /**
     Returns all disabled modules in an array

     @return   <b>array</b>
     */
     public function getDisabledModules()
     {
          return $this->disabled;
     }

     /**
     Returns root path for module with ID <var>$id</var>.

     @param    id        <b>string</b>       Module ID
     @return   <b>string</b>
     */
     public function moduleRoot($id)
     {
          return $this->moduleInfo($id,'root');
     }

     /**
     Returns a module information that could be:
     - root
     - name
     - desc
     - author
     - version
     - permissions
     - priority

     @param    id        <b>string</b>       Module ID
     @param    info      <b>string</b>       Information to retrieve
     @return   <b>string</b>
     */
     public function moduleInfo($id,$info)
     {
          return isset($this->modules[$id][$info]) ? $this->modules[$id][$info] : null;
     }

     /**
     Loads namespace <var>$ns</var> specific files for all modules.

     @param    ns        <b>string</b>       Namespace name
     */
     public function loadNsFiles($ns=null)
     {
          foreach ($this->modules as $k => $v) {
               $this->loadNsFile($k,$ns);
          }
     }

     /**
     Loads namespace <var>$ns</var> specific file for module with ID
     <var>$id</var>

     @param    id        <b>string</b>       Module ID
     @param    ns        <b>string</b>       Namespace name
     */
     public function loadNsFile($id,$ns=null)
     {
          switch ($ns) {
               case 'admin':
                    $this->loadModuleFile($this->modules[$id]['root'].'/_admin.php');
                    break;
               case 'public':
                    $this->loadModuleFile($this->modules[$id]['root'].'/_public.php');
                    break;
               case 'xmlrpc':
                    $this->loadModuleFile($this->modules[$id]['root'].'/_xmlrpc.php');
                    break;
          }
     }

     public function getErrors()
     {
          return $this->errors;
     }

     protected function loadModuleFile($________,$catch = true)
     {
          if (!file_exists($________)) {
               return;
          }

          self::$_k = array_keys($GLOBALS);

          foreach (self::$_k as self::$_n) {
               if (!in_array(self::$_n,self::$superglobals)) {
                    global ${self::$_n};
               }
          }

          if ($catch) {
               // Catch ouput to prevents hacked or corrupted modules
               ob_start();
               $ret = require $________;
               ob_end_clean();
               return $ret;
          }

          return require $________;
     }

     private function sortModules($a,$b)
     {
          if ($a['priority'] == $b['priority']) {
               return strcasecmp($a['name'],$b['name']);
          }

          return ($a['priority'] < $b['priority']) ? -1 : 1;
     }
}