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   1  <?php
   2  
   3  namespace dokuwiki\plugin\config\core;
   4  use dokuwiki\plugin\config\core\Setting\Setting;
   5  
   6  /**
   7   * Writes the settings to the correct local file
   8   */
   9  class Writer {
  10      /** @var string header info */
  11      protected $header = 'Dokuwiki\'s Main Configuration File - Local Settings';
  12  
  13      /** @var string the file where the config will be saved to */
  14      protected $savefile;
  15  
  16      /**
  17       * Writer constructor.
  18       */
  19      public function __construct() {
  20          global $config_cascade;
  21          $this->savefile = end($config_cascade['main']['local']);
  22      }
  23  
  24      /**
  25       * Save the given settings
  26       *
  27       * @param Setting[] $settings
  28       * @throws \Exception
  29       */
  30      public function save($settings) {
  31          global $conf;
  32          if($this->isLocked()) throw new \Exception('no save');
  33  
  34          // backup current file (remove any existing backup)
  35          if(file_exists($this->savefile)) {
  36              if(file_exists($this->savefile . '.bak.php')) @unlink($this->savefile . '.bak.php');
  37              if(!io_rename($this->savefile, $this->savefile . '.bak.php')) throw new \Exception('no backup');
  38          }
  39  
  40          if(!$fh = @fopen($this->savefile, 'wb')) {
  41              io_rename($this->savefile . '.bak.php', $this->savefile); // problem opening, restore the backup
  42              throw new \Exception('no save');
  43          }
  44  
  45          $out = $this->getHeader();
  46          foreach($settings as $setting) {
  47              if($setting->shouldBeSaved()) {
  48                  $out .= $setting->out('conf', 'php');
  49              }
  50          }
  51  
  52          fwrite($fh, $out);
  53          fclose($fh);
  54          if($conf['fperm']) chmod($this->savefile, $conf['fperm']);
  55          $this->opcacheUpdate($this->savefile);
  56      }
  57  
  58      /**
  59       * Update last modified time stamp of the config file
  60       *
  61       * Will invalidate all DokuWiki caches
  62       *
  63       * @throws \Exception when the config isn't writable
  64       */
  65      public function touch() {
  66          if($this->isLocked()) throw new \Exception('no save');
  67          @touch($this->savefile);
  68          $this->opcacheUpdate($this->savefile);
  69      }
  70  
  71      /**
  72       * Invalidate the opcache of the given file
  73       *
  74       * @todo this should probably be moved to core
  75       * @param string $file
  76       */
  77      protected function opcacheUpdate($file) {
  78          if(!function_exists('opcache_invalidate')) return;
  79          opcache_invalidate($file);
  80      }
  81  
  82      /**
  83       * Configuration is considered locked if there is no local settings filename
  84       * or the directory its in is not writable or the file exists and is not writable
  85       *
  86       * @return bool true: locked, false: writable
  87       */
  88      public function isLocked() {
  89          if(!$this->savefile) return true;
  90          if(!is_writable(dirname($this->savefile))) return true;
  91          if(file_exists($this->savefile) && !is_writable($this->savefile)) return true;
  92          return false;
  93      }
  94  
  95      /**
  96       * Returns the PHP intro header for the config file
  97       *
  98       * @return string
  99       */
 100      protected function getHeader() {
 101          return join(
 102              "\n",
 103              array(
 104                  '<?php',
 105                  '/*',
 106                  ' * ' . $this->header,
 107                  ' * Auto-generated by config plugin',
 108                  ' * Run for user: ' . $_SERVER['REMOTE_USER'],
 109                  ' * Date: ' . date('r'),
 110                  ' */',
 111                  '',
 112                  ''
 113              )
 114          );
 115      }
 116  }