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   1  <?php
   2  // $Id: upload_element.pages.inc,v 1.1.2.4 2009/06/24 10:31:06 aland Exp $
   3  
   4  /**
   5   * @file
   6   * Handles image previews from both temperary and perminant file directories.
   7   */
   8  
   9  /**
  10   * Generates a temp image for image preview.
  11   *
  12   * This uses core Drupal image processing.
  13   */
  14  function image_upload_element_thumb() {
  15    $GLOBALS['devel_shutdown'] = FALSE;
  16    list($form_build_id, $name, $fid) = func_get_args();
  17    // Load the element and pull out the defaults.
  18    $form_state = array('submitted' => FALSE);
  19    if($form = form_get_cache($form_build_id, $form_state)) {
  20      $form += array('#post' => array(), '#programmed' => TRUE);
  21      // calling form_builder would trigger the session to be cleared
  22      $element = locate_upload_element($form, $name);
  23      if ($element && $image = image_upload_element_preview_path($form_build_id, $name, $element['#image_preview_default_image'])) {
  24        $info = image_get_info($image->filepath);
  25        if ($info) {
  26          // create temp file, minimise conflicts by instant touch
  27          $tmp_file = file_destination(file_directory_temp() .'/upload_element_'. $fid .'.'. $info['extension'], FILE_EXISTS_RENAME);
  28  
  29          $width = 100;
  30          $height = 100;
  31          if ($element['#image_preview_size'] && preg_match('/^\d+x\d+$/', $element['#image_preview_size'])) {
  32            list($width, $height) = explode('x', $element['#image_preview_size'], 2);
  33          }
  34  
  35          if (!image_scale($image->filepath, $tmp_file, $width, $height)) {
  36            $tmp_file = $image->filepath;
  37          }
  38          $tmp_info = image_get_info($tmp_file);
  39          if ($tmp_info) {
  40            $headers = array(
  41              'Content-type: '. $tmp_info['mime_type'],
  42              'Content-Length: '. $tmp_info['file_size'],
  43              'Cache-Control: max-age=0, no-cache',
  44              'Expires: '. gmdate('D, d M Y H:i:s', time()) .' GMT',
  45              'Last-Modified: '. time(),
  46            );
  47            ob_end_clean();
  48            foreach ($headers as $header) {
  49              $header = preg_replace('/\r?\n(?!\t| )/', '', $header);
  50              drupal_set_header($header);
  51            }
  52  
  53            // Transfer file in 1024 byte chunks to save memory usage.
  54            if ($fd = fopen($tmp_file, 'rb')) {
  55              while (!feof($fd)) {
  56                print fread($fd, 1024);
  57              }
  58              fclose($fd);
  59            }
  60            else {
  61              watchdog('Upload element', 'Error generating the image thumbnail.', array(), WATCHDOG_ERROR);
  62            }
  63          }
  64          else {
  65            watchdog('Upload element', 'Error generating the image thumbnail.', array(), WATCHDOG_ERROR);
  66          }
  67  
  68          // We're using the original if it is too small - do not delete!
  69          if ($image->filepath != $tmp_file) {
  70            @unlink($tmp_file);
  71          }
  72        }
  73        else {
  74          watchdog('Upload element', 'No image information could be parsed from the upload.', array(), WATCHDOG_ERROR);
  75        }
  76      }
  77      else {
  78        watchdog('Upload element', 'No preview path was created.', array(), WATCHDOG_ERROR);
  79      }
  80    }
  81    else {
  82      watchdog('Upload element', 'Form element was not found. This form may not be compatible with this module.', array(), WATCHDOG_ERROR);
  83    }
  84    if (!headers_sent()) {
  85      drupal_set_header('HTTP/1.1 404 Not Found');
  86    }
  87    exit;
  88  }
  89  
  90  /**
  91   * This parses the session to pull out the filepath of the image.
  92   *
  93   * @param string $form_build_id The build id of the current form.
  94   * @param string $name The key of the element.
  95   * @param string $default A default image path to override the modules default image.
  96   * @return object A file object, though the only property may be the filepath.
  97   */
  98  function image_upload_element_preview_path($form_build_id, $name, $default = FALSE) {
  99    if (is_array($_SESSION['files']['upload_element'][$form_build_id])) {
 100      $files = $_SESSION['files']['upload_element'][$form_build_id];
 101      $file = (isset($files[$name]) && is_object($files[$name])) ? $files[$name] : $files[$name . '_default'];
 102      if (is_object($file)) {
 103        if (!(isset($file->submit_action) && $file->submit_action == UPLOAD_ELEMENT_DELETE)) {
 104          return $file;
 105        }
 106      }
 107    }
 108    // This allows you to overwrite the default image
 109    $image= new stdClass();
 110    if ($default && image_get_info($default)) {
 111      $image->filepath = $default;
 112    }
 113    else {
 114      $image->filepath = drupal_get_path('module', 'upload_element') .'/no_image.gif';
 115    }
 116    return $image;
 117  }
 118  
 119  /**
 120   * Handles the AHAH upload request.
 121   *
 122   * @param string $name The elements name.
 123   */
 124  function upload_element_js($form_build_id, $form_id, $name) {
 125    $GLOBALS['devel_shutdown'] = FALSE;
 126    $form_state = array('submitted' => FALSE);
 127    // The only way to detect if the max post size was exceeded is to check the $_POST
 128    // The $for_build_id is potentially stale (from changing form_build_id)
 129    // but is the only reference we have if the $_POST has been dropped by
 130    // PHP by exceeding the MAX_FORM_SIZE limit.
 131    // TODO: Find out what is happening to the AHAH during rebuild.
 132    if (empty($_POST)) {
 133      form_set_error($name, t("The file %file could not be saved, because it exceeds this form's size limit %size for file uploads.", array('%file' => $_FILES['files']['name'][$name], '%size' => format_size(file_upload_max_size()))), 'error');
 134    }
 135    else {
 136      $form_build_id = $_POST['form_build_id'];
 137    }
 138    if ($form_build_id && $form = form_get_cache($form_build_id, $form_state)) {
 139      $form += array('#post' => $_POST);
 140      if ($element = locate_upload_element($form, $name, array('#is_ahah' => TRUE))) {
 141        $form = form_builder($form_id, $form, $form_state);
 142        $element = locate_upload_element($form, $name);
 143        $element['#messages'] = theme('status_messages');
 144        $output = drupal_render($element);
 145        print drupal_to_js(array('data' => $output));
 146        exit();
 147      }
 148    }
 149    else {
 150      form_set_error('form_token', t('Validation error, please try again. If this error persists, please contact the site administrator.'));
 151    }
 152    $output = theme('status_messages');
 153    print drupal_to_js(array('status' => TRUE, 'data' => $output));
 154    exit();
 155  }
 156  
 157  
 158  /**
 159   * This does a recursive check on the cached form
 160   * to locate a given element.
 161   *
 162   * @param array $form The form.
 163   * @param string $name The element name.
 164   * @return mixed Either the found element or FALSE.
 165   */
 166  function locate_upload_element(&$form, $name, $extras = array()) {
 167    foreach (element_children($form) as $key) {
 168      // Various modules were causing false positives & errors
 169      if (isset($form[$key]) && is_array($form[$key])) {
 170        if ($key == $name && isset($form[$key]['#type'])
 171            && ($form[$key]['#type'] == 'upload_element' || $form[$key]['#type'] == 'image_upload_element')) {
 172          $form[$key] += $extras;
 173          return $form[$key];
 174        }
 175        else {
 176          if ($element = locate_upload_element($form[$key], $name, $extras)) {
 177            return $element;
 178          }
 179        }
 180      }
 181    }
 182    return FALSE;
 183  }