libraries/display_import_ajax.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4 * Handles plugins that show the upload progress
   5 *
   6 * @package PhpMyAdmin
   7 */
   8 if (! defined('PHPMYADMIN')) {
   9     exit;
  10 }
  11
  12 /**
  13   * constant for differenciating array in $_SESSION variable
  14   */
  15 $SESSION_KEY = '__upload_status';
  16
  17 /**
  18   * sets default plugin for handling the import process
  19   */
  20 $_SESSION[$SESSION_KEY]["handler"] = "";
  21
  22 /**
  23   * unique ID for each upload
  24   */
  25 $upload_id = uniqid("");
  26
  27 /**
  28   * list of available plugins
  29   *
  30   * Each plugin has own checkfunction in display_import_ajax.lib.php
  31   * and own file with functions in upload_#KEY#.php
  32   */
  33 $plugins = array(
  34    // PHP 5.4 session-based upload progress is problematic, see bug 3964
  35    //"session",
  36    "progress",
  37    "apc",
  38    "noplugin"
  39 );
  40
  41 // select available plugin
  42 foreach ($plugins as $plugin) {
  43     $check = "PMA_Import_" . $plugin . "Check";
  44
  45     if ($check()) {
  46         $upload_class = "Upload" . ucwords($plugin);
  47         $_SESSION[$SESSION_KEY]["handler"] = $upload_class;
  48         include_once "plugins/import/upload/" . $upload_class . ".class.php";
  49         break;
  50     }
  51 }
  52
  53 /**
  54   * Checks if APC bar extension is available and configured correctly.
  55   *
  56   * @return boolean true if APC extension is available and if rfc1867 is enabled,
  57   *                      false if it is not
  58   */
  59 function PMA_Import_apcCheck()
  60 {
  61     if (! extension_loaded('apc')
  62         || ! function_exists('apc_fetch')
  63         || ! function_exists('getallheaders')
  64     ) {
  65         return false;
  66     }
  67     return (ini_get('apc.enabled') && ini_get('apc.rfc1867'));
  68 }
  69
  70 /**
  71   * Checks if UploadProgress bar extension is available.
  72   *
  73   * @return boolean true if UploadProgress extension is available,
  74   *                 false if it is not
  75   */
  76 function PMA_Import_progressCheck()
  77 {
  78     if (! function_exists("uploadprogress_get_info")
  79         || ! function_exists('getallheaders')
  80     ) {
  81         return false;
  82     }
  83     return true;
  84 }
  85
  86 /**
  87   * Checks if PHP 5.4 session upload-progress feature is available.
  88   *
  89   * @return boolean true if PHP 5.4 session upload-progress is available,
  90   *                 false if it is not
  91   */
  92 function PMA_Import_sessionCheck()
  93 {
  94     if (PMA_PHP_INT_VERSION < 50400
  95         || ! ini_get('session.upload_progress.enabled')
  96     ) {
  97         return false;
  98     }
  99     return true;
 100 }
 101
 102 /**
 103   * Default plugin for handling import.
 104   * If no other plugin is available, noplugin is used.
 105   *
 106   * @return boolean true
 107   */
 108 function PMA_Import_nopluginCheck()
 109 {
 110     return true;
 111 }
 112
 113 /**
 114   * The function outputs json encoded status of uploaded.
 115   * It uses PMA_getUploadStatus, which is defined in plugin's file.
 116   *
 117   * @param string $id ID of transfer, usually $upload_id
 118   *                   from display_import_ajax.lib.php
 119   *
 120   * @return void
 121   */
 122 function PMA_importAjaxStatus($id)
 123 {
 124     header('Content-type: application/json');
 125     echo json_encode(
 126         $_SESSION[$GLOBALS['SESSION_KEY']]['handler']::getUploadStatus($id)
 127     );
 128 }
 129 ?>