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   1  <?php
   2  
   3  /**
   4   * @file
   5   * Utility functions for generating FileField content. Note that image
   6   * generation support requires the GD toolkit.
   7   */
   8  
   9  /**
  10   * Private function used by filefield_content_generate().
  11   */
  12  function _filefield_content_generate($node, $field) {
  13    if ($source = _filefield_generate_file($field)) {
  14      $file = field_file_save_file($source, array(), filefield_widget_file_path($field));
  15  
  16      $item = (array) $file;
  17      $item['list'] = 1;
  18      $item['data']['alt'] = devel_create_greeking(4);
  19      $item['data']['title'] = devel_create_greeking(10);
  20    }
  21    else {
  22      $item = array();
  23    }
  24  
  25    return $item;
  26  }
  27  
  28  /**
  29   * Generate an image based on the properties of a field.
  30   *
  31   * This is made to work with ImageField, and inspects the minimum and maximum
  32   * image sizes and makes sure the generated image matches the requirements.
  33   *
  34   * @return
  35   *   The path to the new file, in the temporary directory.
  36   */
  37  function _filefield_generate_file($field) {
  38    if (empty($field['widget']['file_extensions'])) {
  39      $field['widget']['file_extensions'] = 'png jpg txt';
  40    }
  41  
  42    $extensions = array_intersect(explode(' ', $field['widget']['file_extensions']), array('png', 'jpg', 'txt'));
  43    $extension = array_rand(drupal_map_assoc($extensions));
  44  
  45    if ($extension == 'txt') {
  46      $filesize = empty($field['widget']['max_filesize_per_file']) ? 1024 : parse_size($field['widget']['max_filesize_per_file']);
  47      return _filefield_generate_textfile($filesize);
  48    }
  49    elseif (in_array($extension, array('png', 'jpg')) && function_exists('imagecreate')) {
  50      $min_resolution = empty($field['widget']['min_resolution']) ? '100x100' : $field['widget']['min_resolution'];
  51      $max_resolution = empty($field['widget']['max_resolution']) ? '600x600' : $field['widget']['max_resolution'];
  52      return _filefield_generate_image($extension, $min_resolution, $max_resolution);
  53    }
  54  
  55    return FALSE;
  56  }
  57  
  58  /**
  59   * Private function for generating a random text file.
  60   */
  61  function _filefield_generate_textfile($filesize = 1024) {
  62    static $filesizes = array();
  63  
  64    $temp_file = FALSE;
  65    if (isset($filesizes[$filesize])) {
  66      $temp_file = $filesizes[$filesize];
  67    }
  68    elseif ($temp_file = tempnam(file_directory_temp(), 'filefield_')) {
  69      file_move($temp_file, $temp_file .'.txt');
  70  
  71      $fp = fopen($temp_file, 'w');
  72      fwrite($fp, str_repeat('01', $filesize/2));
  73      fclose($fp);
  74      $filesizes[$filesize] = $temp_file;
  75    }
  76  
  77    return $temp_file;
  78  }
  79  
  80  /**
  81   * Private function for creating a random image.
  82   *
  83   * This function only works with the GD toolkit. ImageMagick is not supported.
  84   */
  85  function _filefield_generate_image($extension = 'png', $min_resolution, $max_resolution) {
  86    static $images = array();
  87  
  88    // Generate a max of 5 different images.
  89    if (!isset($images[$extension][$min_resolution][$max_resolution]) || count($images[$extension][$min_resolution][$max_resolution]) < 5) {
  90      if ($temp_file = tempnam(file_directory_temp(), 'filefield_')) {
  91        file_move($temp_file, $temp_file .'.'. $extension);
  92  
  93        $min = explode('x', $min_resolution);
  94        $max = explode('x', $max_resolution);
  95  
  96        $width = rand((int)$min[0], (int)$max[0]);
  97        $height = rand((int)$min[0], (int)$max[0]);
  98  
  99        // Make a image split into 4 sections with random colors.
 100        $im = imagecreate($width, $height);
 101        for ($n = 0; $n < 4; $n++) {
 102          $color = imagecolorallocate($im, rand(0, 255), rand(0, 255), rand(0, 255));
 103          $x = $width/2 * ($n % 2);
 104          $y = $height/2 * (int) ($n >= 2);
 105          imagefilledrectangle($im, $x, $y, $x + $width/2, $y + $height/2, $color);
 106        }
 107  
 108        // Make a perfect circle in the image middle.
 109        $color = imagecolorallocate($im, rand(0, 255), rand(0, 255), rand(0, 255));
 110        $smaller_dimension = min($width, $height);
 111        $smaller_dimension = ($smaller_dimension % 2) ? $smaller_dimension : $smaller_dimension;
 112        imageellipse($im, $width/2, $height/2, $smaller_dimension, $smaller_dimension, $color);
 113  
 114        $save_function = 'image'. ($extension == 'jpg' ? 'jpeg' : $extension);
 115        $save_function($im, $temp_file);
 116  
 117        $images[$extension][$min_resolution][$max_resolution][$temp_file] = $temp_file;
 118      }
 119    }
 120    // Select one of the images we've already generated for this field.
 121    else {
 122      $temp_file = array_rand($images[$extension][$min_resolution][$max_resolution]);
 123    }
 124  
 125    return $temp_file;
 126  }