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Drupal example source code file (filefield.devel.inc)

This example Drupal source code file (filefield.devel.inc) is included in the DevDaily.com "Drupal Source Code Warehouse" project. The intent of this project is to help you "Learn Drupal by Example".

PHP - Drupal tags/keywords

array, directory, extension, file, function, jpg, math, max_resolution, min_resolution, php, png, rand, smaller_dimension, temp_file

The filefield.devel.inc Drupal example source code

<?php
// $Id: filefield.devel.inc,v 1.3 2009/07/25 02:39:25 quicksketch Exp $

/**
 * @file
 * Utility functions for generating FileField content. Note that image
 * generation support requires the GD toolkit.
 */

/**
 * Private function used by filefield_content_generate().
 */
function _filefield_content_generate($node, $field) {
  if ($source = _filefield_generate_file($field)) {
    $file = field_file_save_file($source, array(), filefield_widget_file_path($field));

    $item = (array) $file;
    $item['list'] = 1;
    $item['data']['alt'] = devel_create_greeking(4);
    $item['data']['title'] = devel_create_greeking(10);
  }
  else {
    $item = array();
  }

  return $item;
}

/**
 * Generate an image based on the properties of a field.
 *
 * This is made to work with ImageField, and inspects the minimum and maximum
 * image sizes and makes sure the generated image matches the requirements.
 *
 * @return
 *   The path to the new file, in the temporary directory.
 */
function _filefield_generate_file($field) {
  if (empty($field['widget']['file_extensions'])) {
    $field['widget']['file_extensions'] = 'png jpg txt';
  }

  $extensions = array_intersect(explode(' ', $field['widget']['file_extensions']), array('png', 'jpg', 'txt'));
  $extension = array_rand(drupal_map_assoc($extensions));

  if ($extension == 'txt') {
    $filesize = empty($field['widget']['max_filesize_per_file']) ? 1024 : parse_size($field['widget']['max_filesize_per_file']);
    return _filefield_generate_textfile($filesize);
  }
  elseif (in_array($extension, array('png', 'jpg')) && function_exists('imagecreate')) {
    $min_resolution = empty($field['widget']['min_resolution']) ? '100x100' : $field['widget']['min_resolution'];
    $max_resolution = empty($field['widget']['max_resolution']) ? '600x600' : $field['widget']['max_resolution'];
    return _filefield_generate_image($extension, $min_resolution, $max_resolution);
  }

  return FALSE;
}

/**
 * Private function for generating a random text file.
 */
function _filefield_generate_textfile($filesize = 1024) {
  static $filesizes = array();

  $temp_file = FALSE;
  if (isset($filesizes[$filesize])) {
    $temp_file = $filesizes[$filesize];
  }
  elseif ($temp_file = tempnam(file_directory_temp(), 'filefield_')) {
    file_move($temp_file, $temp_file .'.txt');

    $fp = fopen($temp_file, 'w');
    fwrite($fp, str_repeat('01', $filesize/2));
    fclose($fp);
    $filesizes[$filesize] = $temp_file;
  }

  return $temp_file;
}

/**
 * Private function for creating a random image.
 *
 * This function only works with the GD toolkit. ImageMagick is not supported.
 */
function _filefield_generate_image($extension = 'png', $min_resolution, $max_resolution) {
  static $images = array();

  // Generate a max of 5 different images.
  if (!isset($images[$extension][$min_resolution][$max_resolution]) || count($images[$extension][$min_resolution][$max_resolution]) < 5) {
    if ($temp_file = tempnam(file_directory_temp(), 'filefield_')) {
      file_move($temp_file, $temp_file .'.'. $extension);

      $min = explode('x', $min_resolution);
      $max = explode('x', $max_resolution);

      $width = rand((int)$min[0], (int)$max[0]);
      $height = rand((int)$min[0], (int)$max[0]);

      // Make a image split into 4 sections with random colors.
      $im = imagecreate($width, $height);
      for ($n = 0; $n < 4; $n++) {
        $color = imagecolorallocate($im, rand(0, 255), rand(0, 255), rand(0, 255));
        $x = $width/2 * ($n % 2);
        $y = $height/2 * (int) ($n >= 2);
        imagefilledrectangle($im, $x, $y, $x + $width/2, $y + $height/2, $color);
      }

      // Make a perfect circle in the image middle.
      $color = imagecolorallocate($im, rand(0, 255), rand(0, 255), rand(0, 255));
      $smaller_dimension = min($width, $height);
      $smaller_dimension = ($smaller_dimension % 2) ? $smaller_dimension : $smaller_dimension;
      imageellipse($im, $width/2, $height/2, $smaller_dimension, $smaller_dimension, $color);

      $save_function = 'image'. ($extension == 'jpg' ? 'jpeg' : $extension);
      $save_function($im, $temp_file);

      $images[$extension][$min_resolution][$max_resolution][$temp_file] = $temp_file;
    }
  }
  // Select one of the images we've already generated for this field.
  else {
    $temp_file = array_rand($images[$extension][$min_resolution][$max_resolution]);
  }

  return $temp_file;
}

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