file.module 37 KB
Newer Older
1 2 3 4 5 6 7
<?php

/**
 * @file
 * Defines a "managed_file" Form API field and a "file" field for Field module.
 */

8
// Load all Field module hooks for File.
9
require_once DRUPAL_ROOT . '/core/modules/file/file.field.inc';
10

11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
/**
 * Implements hook_help().
 */
function file_help($path, $arg) {
  switch ($path) {
    case 'admin/help#file':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('The File module defines a <em>File</em> field type for the Field module, which lets you manage and validate uploaded files attached to content on your site (see the <a href="@field-help">Field module help page</a> for more information about fields). For more information, see the online handbook entry for <a href="@file">File module</a>.', array('@field-help' => url('admin/help/field'), '@file' => 'http://drupal.org/handbook/modules/file')) . '</p>';
      $output .= '<h3>' . t('Uses') . '</h3>';
      $output .= '<dl>';
      $output .= '<dt>' . t('Attaching files to content') . '</dt>';
      $output .= '<dd>' . t('The File module allows users to attach files to content (e.g., PDF files, spreadsheets, etc.), when a <em>File</em> field is added to a given content type using the <a href="@fieldui-help">Field UI module</a>. You can add validation options to your File field, such as specifying a maximum file size and allowed file extensions.', array('@fieldui-help' => url('admin/help/field_ui'))) . '</dd>';
      $output .= '<dt>' . t('Managing attachment display') . '</dt>';
      $output .= '<dd>' . t('When you attach a file to content, you can specify whether it is <em>listed</em> or not. Listed files are displayed automatically in a section at the bottom of your content; non-listed files are available for embedding in your content, but are not included in the list at the bottom.') . '</dd>';
      $output .= '<dt>' . t('Managing file locations') . '</dt>';
      $output .= '<dd>' . t("When you create a File field, you can specify a directory where the files will be stored, which can be within either the <em>public</em> or <em>private</em> files directory. Files in the public directory can be accessed directly through the web server; when public files are listed, direct links to the files are used, and anyone who knows a file's URL can download the file. Files in the private directory are not accessible directly through the web server; when private files are listed, the links are Drupal path requests. This adds to server load and download time, since Drupal must start up and resolve the path for each file download request, but allows for access restrictions.") . '</dd>';
      $output .= '</dl>';
      return $output;
  }
}

33
/**
34
 * Implements hook_menu().
35 36 37 38 39 40
 */
function file_menu() {
  $items = array();

  $items['file/ajax'] = array(
    'page callback' => 'file_ajax_upload',
41
    'delivery callback' => 'ajax_deliver',
42
    'access arguments' => array('access content'),
43
    'theme callback' => 'ajax_base_page_theme',
44 45 46 47 48
    'type' => MENU_CALLBACK,
  );
  $items['file/progress'] = array(
    'page callback' => 'file_ajax_progress',
    'access arguments' => array('access content'),
49
    'theme callback' => 'ajax_base_page_theme',
50 51 52 53 54 55 56
    'type' => MENU_CALLBACK,
  );

  return $items;
}

/**
57
 * Implements hook_element_info().
58
 *
59
 * The managed file element may be used anywhere in Drupal.
60
 */
61
function file_element_info() {
62
  $file_path = drupal_get_path('module', 'file');
63
  $types['managed_file'] = array(
64 65 66 67
    '#input' => TRUE,
    '#process' => array('file_managed_file_process'),
    '#value_callback' => 'file_managed_file_value',
    '#element_validate' => array('file_managed_file_validate'),
68
    '#pre_render' => array('file_managed_file_pre_render'),
69 70 71 72 73 74 75
    '#theme' => 'file_managed_file',
    '#theme_wrappers' => array('form_element'),
    '#progress_indicator' => 'throbber',
    '#progress_message' => NULL,
    '#upload_validators' => array(),
    '#upload_location' => NULL,
    '#extended' => FALSE,
76
    '#attached' => array(
77
      'css' => array($file_path . '/file.admin.css'),
78 79
      'js' => array($file_path . '/file.js'),
    ),
80
  );
81
  return $types;
82 83 84
}

/**
85
 * Implements hook_theme().
86 87 88 89 90
 */
function file_theme() {
  return array(
    // file.module.
    'file_link' => array(
91
      'variables' => array('file' => NULL, 'icon_directory' => NULL),
92 93
    ),
    'file_icon' => array(
94
      'variables' => array('file' => NULL, 'icon_directory' => NULL),
95 96
    ),
    'file_managed_file' => array(
97
      'render element' => 'element',
98 99 100 101
    ),

    // file.field.inc.
    'file_widget' => array(
102
      'render element' => 'element',
103 104
    ),
    'file_widget_multiple' => array(
105
      'render element' => 'element',
106
    ),
107 108 109
    'file_formatter_table' => array(
      'variables' => array('items' => NULL),
    ),
110
    'file_upload_help' => array(
111
      'variables' => array('description' => NULL, 'upload_validators' => NULL),
112 113 114 115 116
    ),
  );
}

/**
117
 * Implements hook_file_download().
118 119 120
 *
 * This function takes an extra parameter $field_type so that it may
 * be re-used by other File-like modules, such as Image.
121
 */
122
function file_file_download($uri, $field_type = 'file') {
123 124 125 126 127
  global $user;

  // Get the file record based on the URI. If not in the database just return.
  $files = file_load_multiple(array(), array('uri' => $uri));
  if (count($files)) {
128 129 130 131 132 133 134 135
    foreach ($files as $item) {
      // Since some database servers sometimes use a case-insensitive comparison
      // by default, double check that the filename is an exact match.
      if ($item->uri === $uri) {
        $file = $item;
        break;
      }
    }
136
  }
137
  if (!isset($file)) {
138 139 140
    return;
  }

141
  // Find out which (if any) fields of this type contain the file.
142
  $references = file_get_file_references($file, NULL, FIELD_LOAD_CURRENT, $field_type);
143

144 145 146 147 148
  // Stop processing if there are no references in order to avoid returning
  // headers for files controlled by other modules. Make an exception for
  // temporary files where the host entity has not yet been saved (for example,
  // an image preview on a node/add form) in which case, allow download by the
  // file's owner.
149
  if (empty($references) && ($file->status == FILE_STATUS_PERMANENT || $file->uid != $user->uid)) {
150
      return;
151 152
  }

153 154 155 156 157 158 159 160
  // Default to allow access.
  $denied = FALSE;
  // Loop through all references of this file. If a reference explicitly allows
  // access to the field to which this file belongs, no further checks are done
  // and download access is granted. If a reference denies access, eventually
  // existing additional references are checked. If all references were checked
  // and no reference denied access, access is granted as well. If at least one
  // reference denied access, access is denied.
161
  foreach ($references as $field_name => $field_references) {
162
    foreach ($field_references as $entity_type => $type_references) {
163 164
      foreach ($type_references as $id => $reference) {
        // Try to load $entity and $field.
165 166
        $entity = entity_load($entity_type, array($id));
        $entity = reset($entity);
167
        $field = NULL;
168
        if ($entity) {
169
          // Load all fields for that entity.
170 171 172
          $field_items = field_get_items($entity_type, $entity, $field_name);

          // Find the field item with the matching URI.
173 174 175
          foreach ($field_items as $field_item) {
            if ($field_item['uri'] == $uri) {
              $field = field_info_field($field_name);
176 177
              break;
            }
178 179
          }
        }
180

181 182 183 184
        // Check that $entity and $field were loaded successfully and check if
        // access to that field is not disallowed. If any of these checks fail,
        // stop checking access for this reference.
        if (empty($entity) || empty($field) || !field_access('view', $field, $entity_type, $entity)) {
185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209
          $denied = TRUE;
          break;
        }

        // Invoke hook and collect grants/denies for download access.
        // Default to FALSE and let entities overrule this ruling.
        $grants = array('system' => FALSE);
        foreach (module_implements('file_download_access') as $module) {
          $grants = array_merge($grants, array($module => module_invoke($module, 'file_download_access', $field, $entity_type, $entity)));
        }
        // Allow other modules to alter the returned grants/denies.
        drupal_alter('file_download_access', $grants, $field, $entity_type, $entity);

        if (in_array(TRUE, $grants)) {
          // If TRUE is returned, access is granted and no further checks are
          // necessary.
          $denied = FALSE;
          break 3;
        }

        if (in_array(FALSE, $grants)) {
          // If an implementation returns FALSE, access to this entity is denied
          // but the file could belong to another entity to which the user might
          // have access. Continue with these.
          $denied = TRUE;
210 211 212 213 214
        }
      }
    }
  }

215 216
  // Access specifically denied.
  if ($denied) {
217 218 219 220
    return -1;
  }

  // Access is granted.
221 222
  $headers = file_get_content_headers($file);
  return $headers;
223 224 225
}

/**
226 227
 * Ajax callback: Processes file uploads and deletions.
 *
228 229 230 231
 * This rebuilds the form element for a particular field item. As long as the
 * form processing is properly encapsulated in the widget element the form
 * should rebuild correctly using FAPI without the need for additional callbacks
 * or processing.
232 233
 *
 * @see file_menu()
234 235 236 237 238 239 240 241 242 243
 */
function file_ajax_upload() {
  $form_parents = func_get_args();
  $form_build_id = (string) array_pop($form_parents);

  if (empty($_POST['form_build_id']) || $form_build_id != $_POST['form_build_id']) {
    // Invalid request.
    drupal_set_message(t('An unrecoverable error occurred. The uploaded file likely exceeded the maximum file size (@size) that this server supports.', array('@size' => format_size(file_upload_max_size()))), 'error');
    $commands = array();
    $commands[] = ajax_command_replace(NULL, theme('status_messages'));
244
    return array('#type' => 'ajax', '#commands' => $commands);
245 246
  }

247
  list($form, $form_state) = ajax_get_form();
248 249 250 251 252 253

  if (!$form) {
    // Invalid form_build_id.
    drupal_set_message(t('An unrecoverable error occurred. Use of this form has expired. Try reloading the page and submitting again.'), 'error');
    $commands = array();
    $commands[] = ajax_command_replace(NULL, theme('status_messages'));
254
    return array('#type' => 'ajax', '#commands' => $commands);
255 256 257 258 259 260 261 262 263
  }

  // Get the current element and count the number of files.
  $current_element = $form;
  foreach ($form_parents as $parent) {
    $current_element = $current_element[$parent];
  }
  $current_file_count = isset($current_element['#file_upload_delta']) ? $current_element['#file_upload_delta'] : 0;

264 265
  // Process user input. $form and $form_state are modified in the process.
  drupal_process_form($form['#form_id'], $form, $form_state);
266 267 268 269 270 271

  // Retrieve the element to be rendered.
  foreach ($form_parents as $parent) {
    $form = $form[$parent];
  }

272
  // Add the special Ajax class if a new file was added.
273 274 275 276 277 278 279 280 281 282 283 284 285 286
  if (isset($form['#file_upload_delta']) && $current_file_count < $form['#file_upload_delta']) {
    $form[$current_file_count]['#attributes']['class'][] = 'ajax-new-content';
  }
  // Otherwise just add the new content class on a placeholder.
  else {
    $form['#suffix'] .= '<span class="ajax-new-content"></span>';
  }

  $output = theme('status_messages') . drupal_render($form);
  $js = drupal_add_js();
  $settings = call_user_func_array('array_merge_recursive', $js['settings']['data']);

  $commands = array();
  $commands[] = ajax_command_replace(NULL, $output, $settings);
287
  return array('#type' => 'ajax', '#commands' => $commands);
288 289 290
}

/**
291 292
 * Ajax callback: Retrieves upload progress.
 *
293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317
 * @param $key
 *   The unique key for this upload process.
 */
function file_ajax_progress($key) {
  $progress = array(
    'message' => t('Starting upload...'),
    'percentage' => -1,
  );

  $implementation = file_progress_implementation();
  if ($implementation == 'uploadprogress') {
    $status = uploadprogress_get_info($key);
    if (isset($status['bytes_uploaded']) && !empty($status['bytes_total'])) {
      $progress['message'] = t('Uploading... (@current of @total)', array('@current' => format_size($status['bytes_uploaded']), '@total' => format_size($status['bytes_total'])));
      $progress['percentage'] = round(100 * $status['bytes_uploaded'] / $status['bytes_total']);
    }
  }
  elseif ($implementation == 'apc') {
    $status = apc_fetch('upload_' . $key);
    if (isset($status['current']) && !empty($status['total'])) {
      $progress['message'] = t('Uploading... (@current of @total)', array('@current' => format_size($status['current']), '@total' => format_size($status['total'])));
      $progress['percentage'] = round(100 * $status['current'] / $status['total']);
    }
  }

318
  drupal_json_output($progress);
319 320 321
}

/**
322
 * Determines the preferred upload progress implementation.
323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345
 *
 * @return
 *   A string indicating which upload progress system is available. Either "apc"
 *   or "uploadprogress". If neither are available, returns FALSE.
 */
function file_progress_implementation() {
  static $implementation;
  if (!isset($implementation)) {
    $implementation = FALSE;

    // We prefer the PECL extension uploadprogress because it supports multiple
    // simultaneous uploads. APC only supports one at a time.
    if (extension_loaded('uploadprogress')) {
      $implementation = 'uploadprogress';
    }
    elseif (extension_loaded('apc') && ini_get('apc.rfc1867')) {
      $implementation = 'apc';
    }
  }
  return $implementation;
}

/**
346
 * Implements hook_file_predelete().
347
 */
348
function file_file_predelete($file) {
349 350 351 352
  // TODO: Remove references to a file that is in-use.
}

/**
353
 * Render API callback: Expands the managed_file element type.
354 355 356
 *
 * Expands the file type to include Upload and Remove buttons, as well as
 * support for a default value.
357 358
 *
 * This function is assigned as a #process callback in file_element_info().
359 360 361 362 363 364 365 366 367 368
 */
function file_managed_file_process($element, &$form_state, $form) {
  $fid = isset($element['#value']['fid']) ? $element['#value']['fid'] : 0;

  // Set some default element properties.
  $element['#progress_indicator'] = empty($element['#progress_indicator']) ? 'none' : $element['#progress_indicator'];
  $element['#file'] = $fid ? file_load($fid) : FALSE;
  $element['#tree'] = TRUE;

  $ajax_settings = array(
369
    'path' => 'file/ajax/' . implode('/', $element['#array_parents']) . '/' . $form['form_build_id']['#value'],
370 371 372 373 374 375 376 377 378 379 380 381 382 383 384
    'wrapper' => $element['#id'] . '-ajax-wrapper',
    'effect' => 'fade',
    'progress' => array(
      'type' => $element['#progress_indicator'],
      'message' => $element['#progress_message'],
    ),
  );

  // Set up the buttons first since we need to check if they were clicked.
  $element['upload_button'] = array(
    '#name' => implode('_', $element['#parents']) . '_upload_button',
    '#type' => 'submit',
    '#value' => t('Upload'),
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
385
    '#limit_validation_errors' => array($element['#parents']),
386 387 388 389
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

390 391 392
  // Force the progress indicator for the remove button to be either 'none' or
  // 'throbber', even if the upload button is using something else.
  $ajax_settings['progress']['type'] = ($element['#progress_indicator'] == 'none') ? 'none' : 'throbber';
393 394 395 396 397 398 399 400
  $ajax_settings['progress']['message'] = NULL;
  $ajax_settings['effect'] = 'none';
  $element['remove_button'] = array(
    '#name' => implode('_', $element['#parents']) . '_remove_button',
    '#type' => 'submit',
    '#value' => t('Remove'),
    '#validate' => array(),
    '#submit' => array('file_managed_file_submit'),
401
    '#limit_validation_errors' => array($element['#parents']),
402 403 404 405 406 407 408 409 410 411 412
    '#ajax' => $ajax_settings,
    '#weight' => -5,
  );

  $element['fid'] = array(
    '#type' => 'hidden',
    '#value' => $fid,
  );

  // Add progress bar support to the upload if possible.
  if ($element['#progress_indicator'] == 'bar' && $implementation = file_progress_implementation()) {
413
    $upload_progress_key = mt_rand();
414 415 416 417 418 419

    if ($implementation == 'uploadprogress') {
      $element['UPLOAD_IDENTIFIER'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
420 421 422
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
423 424 425 426 427 428 429
      );
    }
    elseif ($implementation == 'apc') {
      $element['APC_UPLOAD_PROGRESS'] = array(
        '#type' => 'hidden',
        '#value' => $upload_progress_key,
        '#attributes' => array('class' => array('file-progress')),
430 431 432
        // Uploadprogress extension requires this field to be at the top of the
        // form.
        '#weight' => -20,
433 434 435 436 437 438 439 440 441 442 443
      );
    }

    // Add the upload progress callback.
    $element['upload_button']['#ajax']['progress']['path'] = 'file/progress/' . $upload_progress_key;
  }

  // The file upload field itself.
  $element['upload'] = array(
    '#name' => 'files[' . implode('_', $element['#parents']) . ']',
    '#type' => 'file',
444 445
    '#title' => t('Choose a file'),
    '#title_display' => 'invisible',
446 447 448 449 450 451 452 453
    '#size' => 22,
    '#theme_wrappers' => array(),
    '#weight' => -10,
  );

  if ($fid && $element['#file']) {
    $element['filename'] = array(
      '#type' => 'markup',
454
      '#markup' => theme('file_link', array('file' => $element['#file'])) . ' ',
455 456 457 458
      '#weight' => -10,
    );
  }

459
  // Add the extension list to the page as JavaScript settings.
460
  if (isset($element['#upload_validators']['file_validate_extensions'][0])) {
461 462 463 464 465 466 467
    $extension_list = implode(',', array_filter(explode(' ', $element['#upload_validators']['file_validate_extensions'][0])));
    $element['upload']['#attached']['js'] = array(
      array(
        'type' => 'setting',
        'data' => array('file' => array('elements' => array('#' . $element['#id'] . '-upload' => $extension_list)))
      )
    );
468 469
  }

470
  // Prefix and suffix used for Ajax replacement.
471 472 473 474 475 476 477
  $element['#prefix'] = '<div id="' . $element['#id'] . '-ajax-wrapper">';
  $element['#suffix'] = '</div>';

  return $element;
}

/**
478 479 480
 * Render API callback: Determines the value for a managed_file type element.
 *
 * This function is assigned as a #value_callback in file_element_info().
481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512
 */
function file_managed_file_value(&$element, $input = FALSE, $form_state = NULL) {
  $fid = 0;

  // Find the current value of this field from the form state.
  $form_state_fid = $form_state['values'];
  foreach ($element['#parents'] as $parent) {
    $form_state_fid = isset($form_state_fid[$parent]) ? $form_state_fid[$parent] : 0;
  }

  if ($element['#extended'] && isset($form_state_fid['fid'])) {
    $fid = $form_state_fid['fid'];
  }
  elseif (is_numeric($form_state_fid)) {
    $fid = $form_state_fid;
  }

  // Process any input and save new uploads.
  if ($input !== FALSE) {
    $return = $input;

    // Uploads take priority over all other values.
    if ($file = file_managed_file_save_upload($element)) {
      $fid = $file->fid;
    }
    else {
      // Check for #filefield_value_callback values.
      // Because FAPI does not allow multiple #value_callback values like it
      // does for #element_validate and #process, this fills the missing
      // functionality to allow File fields to be extended through FAPI.
      if (isset($element['#file_value_callbacks'])) {
        foreach ($element['#file_value_callbacks'] as $callback) {
513
          $callback($element, $input, $form_state);
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545
        }
      }
      // Load file if the FID has changed to confirm it exists.
      if (isset($input['fid']) && $file = file_load($input['fid'])) {
        $fid = $file->fid;
      }
    }
  }

  // If there is no input, set the default value.
  else {
    if ($element['#extended']) {
      $default_fid = isset($element['#default_value']['fid']) ? $element['#default_value']['fid'] : 0;
      $return = isset($element['#default_value']) ? $element['#default_value'] : array('fid' => 0);
    }
    else {
      $default_fid = isset($element['#default_value']) ? $element['#default_value'] : 0;
      $return = array('fid' => 0);
    }

    // Confirm that the file exists when used as a default value.
    if ($default_fid && $file = file_load($default_fid)) {
      $fid = $file->fid;
    }
  }

  $return['fid'] = $fid;

  return $return;
}

/**
546 547 548 549
 * Render API callback: Validates the managed_file element.
 *
 * This function is assigned as a #element_validate callback in
 * file_element_info().
550 551 552 553 554
 */
function file_managed_file_validate(&$element, &$form_state) {
  // If referencing an existing file, only allow if there are existing
  // references. This prevents unmanaged files from being deleted if this
  // item were to be deleted.
555
  $clicked_button = end($form_state['triggering_element']['#parents']);
556 557 558
  if ($clicked_button != 'remove_button' && !empty($element['fid']['#value'])) {
    if ($file = file_load($element['fid']['#value'])) {
      if ($file->status == FILE_STATUS_PERMANENT) {
559 560 561
        $references = file_usage_list($file);
        if (empty($references)) {
          form_error($element, t('The file used in the !name field may not be referenced.', array('!name' => $element['#title'])));
562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581
        }
      }
    }
    else {
      form_error($element, t('The file referenced by the !name field does not exist.', array('!name' => $element['#title'])));
    }
  }

  // Check required property based on the FID.
  if ($element['#required'] && empty($element['fid']['#value']) && !in_array($clicked_button, array('upload_button', 'remove_button'))) {
    form_error($element['upload'], t('!name field is required.', array('!name' => $element['#title'])));
  }

  // Consolidate the array value of this field to a single FID.
  if (!$element['#extended']) {
    form_set_value($element, $element['fid']['#value'], $form_state);
  }
}

/**
582 583 584
 * Form submission handler for upload / remove buttons of managed_file elements.
 *
 * @see file_managed_file_process()
585 586
 */
function file_managed_file_submit($form, &$form_state) {
587 588 589 590
  // Determine whether it was the upload or the remove button that was clicked,
  // and set $element to the managed_file element that contains that button.
  $parents = $form_state['triggering_element']['#array_parents'];
  $button_key = array_pop($parents);
591
  $element = drupal_array_get_nested_value($form, $parents);
592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608

  // No action is needed here for the upload button, because all file uploads on
  // the form are processed by file_managed_file_value() regardless of which
  // button was clicked. Action is needed here for the remove button, because we
  // only remove a file in response to its remove button being clicked.
  if ($button_key == 'remove_button') {
    // If it's a temporary file we can safely remove it immediately, otherwise
    // it's up to the implementing module to clean up files that are in use.
    if ($element['#file'] && $element['#file']->status == 0) {
      file_delete($element['#file']);
    }
    // Update both $form_state['values'] and $form_state['input'] to reflect
    // that the file has been removed, so that the form is rebuilt correctly.
    // $form_state['values'] must be updated in case additional submit handlers
    // run, and for form building functions that run during the rebuild, such as
    // when the managed_file element is part of a field widget.
    // $form_state['input'] must be updated so that file_managed_file_value()
609
    // has correct information during the rebuild.
610 611
    $values_element = $element['#extended'] ? $element['fid'] : $element;
    form_set_value($values_element, NULL, $form_state);
612
    drupal_array_set_nested_value($form_state['input'], $values_element['#parents'], NULL);
613 614 615 616 617 618 619 620 621
  }

  // Set the form to rebuild so that $form is correctly updated in response to
  // processing the file removal. Since this function did not change $form_state
  // if the upload button was clicked, a rebuild isn't necessary in that
  // situation and setting $form_state['redirect'] to FALSE would suffice.
  // However, we choose to always rebuild, to keep the form processing workflow
  // consistent between the two buttons.
  $form_state['rebuild'] = TRUE;
622 623 624
}

/**
625
 * Saves any files that have been uploaded into a managed_file element.
626 627 628
 *
 * @param $element
 *   The FAPI element whose values are being saved.
629
 *
630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656
 * @return
 *   The file object representing the file that was saved, or FALSE if no file
 *   was saved.
 */
function file_managed_file_save_upload($element) {
  $upload_name = implode('_', $element['#parents']);
  if (empty($_FILES['files']['name'][$upload_name])) {
    return FALSE;
  }

  $destination = isset($element['#upload_location']) ? $element['#upload_location'] : NULL;
  if (isset($destination) && !file_prepare_directory($destination, FILE_CREATE_DIRECTORY)) {
    watchdog('file', 'The upload directory %directory for the file field !name could not be created or is not accessible. A newly uploaded file could not be saved in this directory as a consequence, and the upload was canceled.', array('%directory' => $destination, '!name' => $element['#field_name']));
    form_set_error($upload_name, t('The file could not be uploaded.'));
    return FALSE;
  }

  if (!$file = file_save_upload($upload_name, $element['#upload_validators'], $destination)) {
    watchdog('file', 'The file upload failed. %upload', array('%upload' => $upload_name));
    form_set_error($upload_name, t('The file in the !name field was unable to be uploaded.', array('!name' => $element['#title'])));
    return FALSE;
  }

  return $file;
}

/**
657 658 659 660 661 662 663
 * Returns HTML for a managed file element.
 *
 * @param $variables
 *   An associative array containing:
 *   - element: A render element representing the file.
 *
 * @ingroup themeable
664
 */
665 666 667
function theme_file_managed_file($variables) {
  $element = $variables['element'];

668 669 670 671 672 673 674 675 676
  $attributes = array();
  if (isset($element['#id'])) {
    $attributes['id'] = $element['#id'];
  }
  if (!empty($element['#attributes']['class'])) {
    $attributes['class'] = (array) $element['#attributes']['class'];
  }
  $attributes['class'][] = 'form-managed-file';

677 678
  // This wrapper is required to apply JS behaviors and CSS styling.
  $output = '';
679
  $output .= '<div' . drupal_attributes($attributes) . '>';
680 681 682 683 684
  $output .= drupal_render_children($element);
  $output .= '</div>';
  return $output;
}

685
/**
686
 * Render API callback: Hides display of the upload or remove controls.
687 688 689 690 691 692 693 694 695 696 697 698 699 700
 *
 * Upload controls are hidden when a file is already uploaded. Remove controls
 * are hidden when there is no file attached. Controls are hidden here instead
 * of in file_managed_file_process(), because #access for these buttons depends
 * on the managed_file element's #value. See the documentation of form_builder()
 * for more detailed information about the relationship between #process,
 * #value, and #access.
 *
 * Because #access is set here, it affects display only and does not prevent
 * JavaScript or other untrusted code from submitting the form as though access
 * were enabled. The form processing functions for these elements should not
 * assume that the buttons can't be "clicked" just because they are not
 * displayed.
 *
701 702
 * This function is assigned as a #pre_render callback in file_element_info().
 *
703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
 * @see file_managed_file_process()
 * @see form_builder()
 */
function file_managed_file_pre_render($element) {
  // If we already have a file, we don't want to show the upload controls.
  if (!empty($element['#value']['fid'])) {
    $element['upload']['#access'] = FALSE;
    $element['upload_button']['#access'] = FALSE;
  }
  // If we don't already have a file, there is nothing to remove.
  else {
    $element['remove_button']['#access'] = FALSE;
  }
  return $element;
}

719
/**
720
 * Returns HTML for a link to a file.
721
 *
722 723 724
 * @param $variables
 *   An associative array containing:
 *   - file: A file object to which the link will be created.
725 726
 *   - icon_directory: (optional) A path to a directory of icons to be used for
 *     files. Defaults to the value of the "file_icon_directory" variable.
727 728
 *
 * @ingroup themeable
729
 */
730 731
function theme_file_link($variables) {
  $file = $variables['file'];
732
  $icon_directory = $variables['icon_directory'];
733

734
  $url = file_create_url($file->uri);
735
  $icon = theme('file_icon', array('file' => $file, 'icon_directory' => $icon_directory));
736 737 738 739 740 741 742 743 744 745

  // Set options as per anchor format described at
  // http://microformats.org/wiki/file-format-examples
  $options = array(
    'attributes' => array(
      'type' => $file->filemime . '; length=' . $file->filesize,
    ),
  );

  // Use the description as the link text if available.
746
  if (empty($file->description)) {
747
    $link_text = $file->filename;
748 749
  }
  else {
750
    $link_text = $file->description;
751 752 753 754 755 756 757
    $options['attributes']['title'] = check_plain($file->filename);
  }

  return '<span class="file">' . $icon . ' ' . l($link_text, $url, $options) . '</span>';
}

/**
758
 * Returns HTML for an image with an appropriate icon for the given file.
759
 *
760 761 762
 * @param $variables
 *   An associative array containing:
 *   - file: A file object for which to make an icon.
763 764
 *   - icon_directory: (optional) A path to a directory of icons to be used for
 *     files. Defaults to the value of the "file_icon_directory" variable.
765 766
 *
 * @ingroup themeable
767
 */
768 769
function theme_file_icon($variables) {
  $file = $variables['file'];
770
  $icon_directory = $variables['icon_directory'];
771

772
  $mime = check_plain($file->filemime);
773
  $icon_url = file_icon_url($file, $icon_directory);
774 775 776 777
  return '<img class="file-icon" alt="" title="' . $mime . '" src="' . $icon_url . '" />';
}

/**
778
 * Creates a URL to the icon for a file object.
779 780 781 782 783 784
 *
 * @param $file
 *   A file object.
 * @param $icon_directory
 *   (optional) A path to a directory of icons to be used for files. Defaults to
 *   the value of the "file_icon_directory" variable.
785
 *
786 787 788 789 790 791 792 793 794 795 796
 * @return
 *   A URL string to the icon, or FALSE if an appropriate icon cannot be found.
 */
function file_icon_url($file, $icon_directory = NULL) {
  if ($icon_path = file_icon_path($file, $icon_directory)) {
    return base_path() . $icon_path;
  }
  return FALSE;
}

/**
797
 * Creates a path to the icon for a file object.
798 799 800 801 802 803
 *
 * @param $file
 *   A file object.
 * @param $icon_directory
 *   (optional) A path to a directory of icons to be used for files. Defaults to
 *   the value of the "file_icon_directory" variable.
804
 *
805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849
 * @return
 *   A string to the icon as a local path, or FALSE if an appropriate icon could
 *   not be found.
 */
function file_icon_path($file, $icon_directory = NULL) {
  // Use the default set of icons if none specified.
  if (!isset($icon_directory)) {
    $icon_directory = variable_get('file_icon_directory', drupal_get_path('module', 'file') . '/icons');
  }

  // If there's an icon matching the exact mimetype, go for it.
  $dashed_mime = strtr($file->filemime, array('/' => '-'));
  $icon_path = $icon_directory . '/' . $dashed_mime . '.png';
  if (file_exists($icon_path)) {
    return $icon_path;
  }

  // For a few mimetypes, we can "manually" map to a generic icon.
  $generic_mime = (string) file_icon_map($file);
  $icon_path = $icon_directory . '/' . $generic_mime . '.png';
  if ($generic_mime && file_exists($icon_path)) {
    return $icon_path;
  }

  // Use generic icons for each category that provides such icons.
  foreach (array('audio', 'image', 'text', 'video') as $category) {
    if (strpos($file->filemime, $category . '/') === 0) {
      $icon_path = $icon_directory . '/' . $category . '-x-generic.png';
      if (file_exists($icon_path)) {
        return $icon_path;
      }
    }
  }

  // Try application-octet-stream as last fallback.
  $icon_path = $icon_directory . '/application-octet-stream.png';
  if (file_exists($icon_path)) {
    return $icon_path;
  }

  // No icon can be found.
  return FALSE;
}

/**
850
 * Determines the generic icon MIME package based on a file's MIME type.
851 852 853
 *
 * @param $file
 *   A file object.
854
 *
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981
 * @return
 *   The generic icon MIME package expected for this file.
 */
function file_icon_map($file) {
  switch ($file->filemime) {
    // Word document types.
    case 'application/msword':
    case 'application/vnd.ms-word.document.macroEnabled.12':
    case 'application/vnd.oasis.opendocument.text':
    case 'application/vnd.oasis.opendocument.text-template':
    case 'application/vnd.oasis.opendocument.text-master':
    case 'application/vnd.oasis.opendocument.text-web':
    case 'application/vnd.openxmlformats-officedocument.wordprocessingml.document':
    case 'application/vnd.stardivision.writer':
    case 'application/vnd.sun.xml.writer':
    case 'application/vnd.sun.xml.writer.template':
    case 'application/vnd.sun.xml.writer.global':
    case 'application/vnd.wordperfect':
    case 'application/x-abiword':
    case 'application/x-applix-word':
    case 'application/x-kword':
    case 'application/x-kword-crypt':
      return 'x-office-document';

    // Spreadsheet document types.
    case 'application/vnd.ms-excel':
    case 'application/vnd.ms-excel.sheet.macroEnabled.12':
    case 'application/vnd.oasis.opendocument.spreadsheet':
    case 'application/vnd.oasis.opendocument.spreadsheet-template':
    case 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet':
    case 'application/vnd.stardivision.calc':
    case 'application/vnd.sun.xml.calc':
    case 'application/vnd.sun.xml.calc.template':
    case 'application/vnd.lotus-1-2-3':
    case 'application/x-applix-spreadsheet':
    case 'application/x-gnumeric':
    case 'application/x-kspread':
    case 'application/x-kspread-crypt':
      return 'x-office-spreadsheet';

    // Presentation document types.
    case 'application/vnd.ms-powerpoint':
    case 'application/vnd.ms-powerpoint.presentation.macroEnabled.12':
    case 'application/vnd.oasis.opendocument.presentation':
    case 'application/vnd.oasis.opendocument.presentation-template':
    case 'application/vnd.openxmlformats-officedocument.presentationml.presentation':
    case 'application/vnd.stardivision.impress':
    case 'application/vnd.sun.xml.impress':
    case 'application/vnd.sun.xml.impress.template':
    case 'application/x-kpresenter':
      return 'x-office-presentation';

    // Compressed archive types.
    case 'application/zip':
    case 'application/x-zip':
    case 'application/stuffit':
    case 'application/x-stuffit':
    case 'application/x-7z-compressed':
    case 'application/x-ace':
    case 'application/x-arj':
    case 'application/x-bzip':
    case 'application/x-bzip-compressed-tar':
    case 'application/x-compress':
    case 'application/x-compressed-tar':
    case 'application/x-cpio-compressed':
    case 'application/x-deb':
    case 'application/x-gzip':
    case 'application/x-java-archive':
    case 'application/x-lha':
    case 'application/x-lhz':
    case 'application/x-lzop':
    case 'application/x-rar':
    case 'application/x-rpm':
    case 'application/x-tzo':
    case 'application/x-tar':
    case 'application/x-tarz':
    case 'application/x-tgz':
      return 'package-x-generic';

    // Script file types.
    case 'application/ecmascript':
    case 'application/javascript':
    case 'application/mathematica':
    case 'application/vnd.mozilla.xul+xml':
    case 'application/x-asp':
    case 'application/x-awk':
    case 'application/x-cgi':
    case 'application/x-csh':
    case 'application/x-m4':
    case 'application/x-perl':
    case 'application/x-php':
    case 'application/x-ruby':
    case 'application/x-shellscript':
    case 'text/vnd.wap.wmlscript':
    case 'text/x-emacs-lisp':
    case 'text/x-haskell':
    case 'text/x-literate-haskell':
    case 'text/x-lua':
    case 'text/x-makefile':
    case 'text/x-matlab':
    case 'text/x-python':
    case 'text/x-sql':
    case 'text/x-tcl':
      return 'text-x-script';

    // HTML aliases.
    case 'application/xhtml+xml':
      return 'text-html';

    // Executable types.
    case 'application/x-macbinary':
    case 'application/x-ms-dos-executable':
    case 'application/x-pef-executable':
      return 'application-x-executable';

    default:
      return FALSE;
  }
}

/**
 * @defgroup file-module-api File module public API functions
 * @{
 * These functions may be used to determine if and where a file is in use.
 */

/**
982
 * Retrieves a list of references to a file.
983 984 985 986
 *
 * @param $file
 *   A file object.
 * @param $field
987 988
 *   (optional) A field array to be used for this check. If given, limits the
 *   reference check to the given field.
989 990 991 992
 * @param $age
 *   (optional) A constant that specifies which references to count. Use
 *   FIELD_LOAD_REVISION to retrieve all references within all revisions or
 *   FIELD_LOAD_CURRENT to retrieve references only in the current revisions.
993
 * @param $field_type
994 995 996
 *   (optional) The name of a field type. If given, limits the reference check
 *   to fields of the given type.
 *
997 998 999
 * @return
 *   An integer value.
 */
1000
function file_get_file_references($file, $field = NULL, $age = FIELD_LOAD_REVISION, $field_type = 'file') {
1001
  $references = drupal_static(__FUNCTION__, array());
1002
  $fields = isset($field) ? array($field['field_name'] => $field) : field_info_fields();
1003 1004

  foreach ($fields as $field_name => $file_field) {
1005
    if ((empty($field_type) || $file_field['type'] == $field_type) && !isset($references[$field_name])) {
1006
      // Get each time this file is used within a field.
1007
      $query = new EntityFieldQuery();
1008 1009 1010 1011
      $query
        ->fieldCondition($file_field, 'fid', $file->fid)
        ->age($age);
      $references[$field_name] = $query->execute();
1012 1013 1014
    }
  }

1015
  return isset($field) ? $references[$field['field_name']] : array_filter($references);
1016 1017 1018 1019 1020
}

/**
 * @} End of "defgroup file-module-api".
 */