filter.module 32.2 KB
Newer Older
1 2 3
<?php
// $Id$

4 5
define('FILTER_FORMAT_DEFAULT', 0);

6 7 8 9 10 11
define('FILTER_HTML_STRIP', 1);
define('FILTER_HTML_ESCAPE', 2);

define('FILTER_STYLE_ALLOW', 0);
define('FILTER_STYLE_STRIP', 1);

Dries's avatar
Dries committed
12 13 14 15
/**
 * Implementation of hook_help().
 */
function filter_help($section) {
16 17 18
  // Get rid of variable numbers in the URL
  $section = preg_replace('/[0-9]+/', '#', $section);

19
  switch ($section) {
Dries's avatar
 
Dries committed
20
    case 'admin/modules#description':
Dries's avatar
Dries committed
21
      return t('Framework for handling filtering of content.');
22

Dries's avatar
 
Dries committed
23
    case 'admin/filters':
24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39
      return t('
<p><i>Input formats</i> define a way of processing user-supplied text in Drupal. Every input format has its own settings of which <i>filters</i> to apply. Possible filters include stripping out malicious HTML and making URLs clickable.</p>
<p>Users can choose between the available input formats when submitting content.</p>
<p>Below you can configure which input formats are available to which roles, as well as choose a default input format (used for imported content, for example).</p>');

    case 'admin/filters/#':
      return t('
<p>Every <i>filter</i> performs one particular change on the user input, for example stripping out malicious HTML or making URLs clickable. Choose which filters you want to apply to text in this input format.</p>
<p>If you notice some filters are causing conflicts in the output, you can <a href="%order">rearrange them</a>.', array('%configure' => url('admin/filters/'. arg(2) .'/configure'), '%order' => url('admin/filters/'. arg(2) .'/order')));

    case 'admin/filters/#/configure':
      return t('
<p>If you cannot find the settings for a certain filter, make sure you\'ve enabled it on the <a href="%url">list filters</a> tab first.</p>', array('%url' => url('admin/filters/'. arg(2) .'/list')));

    case 'admin/filters/#/order':
      return t('
Dries's avatar
 
Dries committed
40
<p>Because of the flexible filtering system, you might encounter a situation where one filter prevents another from doing its job. For example: a word in an URL gets converted into a glossary term, before the URL can be converted in a clickable link. When this happens, you will need to rearrange the order in which filters get executed.</p>
41 42 43 44 45
<p>Filters are executed from top-to-bottom. You can use the weight column to rearrange them: heavier filters \'sink\' to the bottom.</p>');
  }
}

/**
46
 * Implementation of hook_filter_tips().
47
 */
48
function filter_filter_tips($delta, $format, $long = false) {
49 50 51 52 53 54
  switch ($delta) {
    case 0:
      switch (variable_get("filter_html_$format", FILTER_HTML_STRIP)) {

        case FILTER_HTML_STRIP:
          if ($allowed_html = variable_get("allowed_html_$format", '<a> <b> <dd> <dl> <dt> <i> <li> <ol> <u> <ul>')) {
Dries's avatar
Dries committed
55
            return t('Allowed HTML tags') .': '. htmlspecialchars($allowed_html);
56 57
          }
          else {
Dries's avatar
Dries committed
58
            return t('No HTML tags allowed');
Dries's avatar
 
Dries committed
59
          }
60 61

        case FILTER_STYLE_STRIP:
Dries's avatar
Dries committed
62
          return t('No HTML tags allowed');
Dries's avatar
 
Dries committed
63 64
      }
      break;
65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96

    case 1:
      switch ($type) {
        case 0:
          return t('You may post PHP code. You should include &lt;?php ?&gt; tags.');
        case 1:
          return t('
<h4>Using custom PHP code</h4>
<p>If you know how to script in PHP, Drupal gives you the power to embed any script you like. It will be executed when the page is viewed and dynamically embedded into the page. This gives you amazing flexibility and power, but of course with that comes danger and insecurity if you don\'t write good code. If you are not familiar with PHP, SQL or with the site engine, avoid experimenting with PHP because you can corrupt your database or render your site insecure or even unusable! If you don\'t plan to do fancy stuff with your content then you\'re probably better off with straight HTML.</p>
<p>Remember that the code within each PHP item must be valid PHP code - including things like correctly terminating statements with a semicolon. It is highly recommended that you develop your code separately using a simple test script on top of a test database before migrating to your production environment.</p>
<p>Notes:</p><ul><li>You can use global variables, such as configuration parameters, within the scope of your PHP code but remember that global variables which have been given values in your code will retain these values in the engine afterwards.</li><li>register_globals is now set to <strong>off</strong> by default. If you need form information you need to get it from the "superglobals" $_POST, $_GET, etc.</li><li>You can either use the <code>print</code> or <code>return</code> statement to output the actual content for your item.</li></ul>
<p>A basic example:</p>
<blockquote><p>You want to have a box with the title "Welcome" that you use to greet your visitors. The content for this box could be created by going:</p>
<pre>
  print t("Welcome visitor, ... welcome message goes here ...");
</pre>
<p>If we are however dealing with a registered user, we can customize the message by using:</p>
<pre>
  global $user;
  if ($user->uid) {
    print t("Welcome $user->name, ... welcome message goes here ...");
  }
  else {
    print t("Welcome visitor, ... welcome message goes here ...");
  }
</pre></blockquote>
<p>For more in-depth examples, we recommend that you check the existing Drupal code and use it as a starting point, especially for sidebar boxes.</p>');
      }

    case 3:
      return t('Lines and paragraphs break automatically.');
      break;
97 98 99
  }
}

100

Dries's avatar
 
Dries committed
101
/**
Dries's avatar
 
Dries committed
102
 * Implementation of hook_menu().
Dries's avatar
 
Dries committed
103
 */
Dries's avatar
 
Dries committed
104 105
function filter_menu() {
  $items = array();
106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144

  $items[] = array('path' => 'admin/filters', 'title' => t('input formats'),
    'callback' => 'filter_admin_overview',
    'access' => user_access('administer filters'));

  $items[] = array('path' => 'admin/filters/delete', 'title' => t('delete input format'),
    'callback' => 'filter_admin_delete',
    'type' => MENU_CALLBACK,
    'access' => user_access('administer filters'));

  if (arg(0) == 'admin' && arg(1) == 'filters' && is_numeric(arg(2))) {
    $formats = filter_formats();

    if (isset($formats[arg(2)])) {
      $items[] = array('path' => 'admin/filters/'. arg(2), 'title' => t("'%format' input format", array('%format' => $formats[arg(2)]->name)),
      'callback' => 'filter_admin_filters',
      'type' => MENU_CALLBACK,
      'access' => user_access('administer filters'));

      $items[] = array('path' => 'admin/filters/'. arg(2) .'/list', 'title' => t('list filters'),
      'callback' => 'filter_admin_filters',
      'type' => MENU_DEFAULT_LOCAL_TASK,
      'weight' => 0,
      'access' => user_access('administer filters'));

      $items[] = array('path' => 'admin/filters/'. arg(2) .'/configure', 'title' => t('configure filters'),
      'callback' => 'filter_admin_configure',
      'type' => MENU_LOCAL_TASK,
      'weight' => 1,
      'access' => user_access('administer filters'));

      $items[] = array('path' => 'admin/filters/'. arg(2) .'/order', 'title' => t('rearrange filters'),
      'callback' => 'filter_admin_order',
      'type' => MENU_LOCAL_TASK,
      'weight' => 2,
      'access' => user_access('administer filters'));
    }
  }

Dries's avatar
 
Dries committed
145 146 147 148
  $items[] = array('path' => 'filter/tips', 'title' => t('compose tips'),
    'callback' => 'filter_tips_long', 'access' => TRUE,
    'type' => MENU_SUGGESTED_ITEM);
  return $items;
149 150
}

Dries's avatar
Dries committed
151
/**
152
 * Implementation of hook_perm().
Dries's avatar
Dries committed
153
 */
154 155 156 157 158
function filter_perm() {
  return array('administer filters');
}

/**
159
 * Menu callback; allows administrators to set up input formats.
160 161 162 163 164 165 166 167 168 169 170 171
 */
function filter_admin_overview() {
  // Process form submission
  switch ($_POST['op']) {
    case t('Save input formats'):
      filter_admin_save();
      break;
    case t('Add input format'):
      filter_admin_add();
      break;
  }

172
  // Overview of all formats.
173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211
  $formats = filter_formats();
  $roles = user_roles();
  $error = false;

  $header = array(t('name'), t('default'));
  foreach ($roles as $name) {
    $header[] = $name;
  }
  $header[] = array('data' => t('operations'), 'colspan' => 2);

  $rows = array();
  foreach ($formats as $id => $format) {
    $row = array();
    $default = ($id == variable_get('filter_default_format', 1));

    $row[] = form_textfield('', "name][$id", $format->name, 16, 255);
    $row[] = form_radio('', 'default', $id, $default);

    foreach ($roles as $rid => $name) {
      $checked = strstr($format->roles, ",$rid,");

      if ($default && !$checked && !$error) {
        form_set_error("roles][$id][$rid", t('The default input format must be accessible to every role.'));
        $error = true;
      }

      $row[] = form_checkbox('', "roles][$id][$rid", 1, $checked);
    }

    $row[] = l('configure', 'admin/filters/'. $id);
    $row[] = $default ? '' : l('delete', 'admin/filters/delete/'. $id);

    $rows[] = $row;
  }

  $group = theme('table', $header, $rows);
  $group .= form_submit(t('Save input formats'));
  $output = '<h2>'. t('Permissions and settings') . '</h2>' . form($group);

212
  // Form to add a new format.
213 214 215 216 217 218 219 220 221 222
  $group = t("<p>To add a new input format, type its name here. After it has been added, you can configure its options.</p>");
  $form = form_textfield(t('Name'), 'name', '', 40, 255);
  $form .= form_submit(t('Add input format'));
  $group .= form($form);
  $output .= '<h2>'. t('Add new input format') .'</h2>'. $group;

  print theme('page', $output);
}

/**
223
 * Save input formats on the overview page.
224 225
 */
function filter_admin_save() {
Dries's avatar
Dries committed
226
  $edit = $_POST['edit'];
227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249

  variable_set('filter_default_format', $edit['default']);

  foreach ($edit['name'] as $id => $name) {
    $name = trim($name);

    if (strlen($name) == 0) {
      drupal_set_message(t('You must enter a name for this input format.'));
      drupal_goto('admin/filters');
    }
    else {
      db_query("UPDATE {filter_formats} SET name='%s' WHERE format = %d", $name, $id);
    }
  }

  // We store the roles as a string for ease of use.
  // We use leading and trailing comma's to allow easy substring matching.
  foreach ($edit['roles'] as $id => $format) {
    $roles = ',';
    foreach ($format as $rid => $value) {
      if ($value) {
        $roles .= $rid .',';
      }
Dries's avatar
 
Dries committed
250
    }
251 252 253 254 255 256 257 258
    db_query("UPDATE {filter_formats} SET roles = '%s' WHERE format = %d", $roles, $id);
  }

  drupal_set_message(t('The input format settings have been updated.'));
  drupal_goto('admin/filters');
}

/**
259
 * Add a new input format.
260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
 */
function filter_admin_add() {
  $edit = $_POST['edit'];

  $name = trim($edit['name']);

  if (strlen($name) == 0) {
    drupal_set_message(t('You must enter a name for this input format.'));
    drupal_goto('admin/filters');
  }
  else {
    db_query("INSERT INTO {filter_formats} (name) VALUES ('%s')", $name);
  }

  drupal_set_message(t("Added input format '%format'", array('%format' => $edit['name'])));
  drupal_goto('admin/filters');
}

/**
279
 * Menu callback; confirm deletion of a format.
280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310
 */
function filter_admin_delete() {
  $edit = $_POST['edit'];
  if ($_POST['op'] == t('Confirm deletion')) {
    if ($edit['format'] != variable_get('filter_default_format', 1)) {
      db_query("DELETE FROM {filter_formats} WHERE format = %d", $edit['format']);
      db_query("DELETE FROM {filters} WHERE format = %d", $edit['format']);

      $default = variable_get('filter_default_format', 1);
      db_query("UPDATE {node} SET format = %d WHERE format = %d", $default, $edit['format']);
      db_query("UPDATE {comments} SET format = %d WHERE format = %d", $default, $edit['format']);
      db_query("UPDATE {boxes} SET format = %d WHERE format = %d", $default, $edit['format']);

      cache_clear_all('filter:'. $edit['format'], true);

      drupal_set_message(t("Deleted input format '%format'", array('%format' => $edit['name'])));
    }
    drupal_goto('admin/filters');
  }

  $format = arg(3);
  $format = db_fetch_object(db_query('SELECT * FROM {filter_formats} WHERE format = %d', $format));

  $form .= form_hidden('format', $format->format);
  $form .= form_hidden('name', $format->name);
  $form .= '<p>'. t("Are you sure you want to delete the input format '%format'? If you have any content left in this input format, it will be switched to the default input format.", array('%format' => $format->name)) .'</p>';
  $form .= form_submit(t('Confirm deletion'));
  print theme('page', form($form));
}

/**
311
 * Ask for confirmation before deleting a format.
312 313 314 315 316 317 318 319 320
 */
function filter_admin_confirm() {
  $edit = $_POST['edit']['format'];


  return form($form);
}

/**
321
 * Menu callback; configure the filters for a format.
322 323 324 325
 */
function filter_admin_filters() {
  $format = arg(2);

326
  // Handle saving of weights.
327 328 329 330 331 332 333
  if ($_POST['op']) {
    filter_admin_filters_save($format, $_POST['edit']);
  }

  $all = filter_list_all();
  $enabled = filter_list_format($format);

334
  // Table with filters
335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351
  $header = array('enabled', 'name', 'description');
  $rows = array();
  foreach ($all as $id => $filter) {
    $row = array();
    $row[] = form_checkbox('', $id, 1, isset($enabled[$id]));
    $row[] = $filter->name;
    $row[] = module_invoke($filter->module, 'filter', 'description', $filter->delta);

    $rows[] = $row;
  }
  $form = theme('table', $header, $rows);
  if (!$empty) {
    $form .= form_submit(t('Save configuration'));
  }

  $output .= '<h2>'. t('Filters') .'</h2>'. form($form);

352
  // Composition tips (guidelines)
353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396
  $tips = _filter_tips($format, false);
  $extra = l(t('More information about formatting options'), 'filter/tips');
  $tiplist = theme('filter_tips', $tips, $extra);
  if (!$tiplist) {
    $tiplist = t('<p>No guidelines available.</p>');
  }
  $group = t('<p>These are the guidelines that users will see for posting in this input format. They are automatically generated from the filter settings.</p>');
  $group .= $tiplist;
  $output .= '<h2>'. t('Formatting guidelines') .'</h2>'. $group;

  print theme('page', $output);
}

/**
 * Save enabled/disabled status for filters in a format.
 */
function filter_admin_filters_save($format, $toggles) {
  $current = filter_list_format($format);

  $cache = true;

  db_query("DELETE FROM {filters} WHERE format = %d", $format);
  foreach ($toggles as $id => $checked) {
    if ($checked) {
      list($module, $delta) = explode('/', $id);
      // Add new filters to the bottom
      $weight = isset($current[$id]->weight) ? $current[$id]->weight : 10;
      db_query("INSERT INTO {filters} (format, module, delta, weight) VALUES (%d, '%s', %d, %d)", $format, $module, $delta, $weight);

      // Check if there are any 'no cache' filters
      $cache &= !module_invoke($module, 'filter', 'no cache', $delta);
    }
  }

  // Update the format's 'no cache' flag.
  db_query('UPDATE {filter_formats} SET cache = %d WHERE format = %d', (int)$cache, $format);

  cache_clear_all('filter:'. $format, true);

  drupal_set_message(t('The input format has been updated.'));
  drupal_goto('admin/filters/'. arg(2) .'/list');
}

/**
397
 * Menu callback; display form for ordering filters for a format.
398 399 400 401 402
 */
function filter_admin_order() {
  $format = arg(2);
  if ($_POST['op']) {
    filter_admin_order_save($format, $_POST['edit']);
Dries's avatar
 
Dries committed
403 404 405
  }

  // Get list (with forced refresh)
406
  $filters = filter_list_format($format);
Dries's avatar
 
Dries committed
407

408
  $header = array(t('name'), t('weight'));
Dries's avatar
 
Dries committed
409 410
  $rows = array();

411 412
  foreach ($filters as $id => $filter) {
    $rows[] = array($filter->name, form_weight('', $id, $filter->weight));
Dries's avatar
 
Dries committed
413 414
  }

Dries's avatar
Dries committed
415 416
  $form  = theme('table', $header, $rows);
  $form .= form_submit(t('Save configuration'));
Dries's avatar
 
Dries committed
417 418
  $output = form($form);

Dries's avatar
Dries committed
419
  print theme('page', $output);
Dries's avatar
 
Dries committed
420 421
}

Dries's avatar
Dries committed
422
/**
423 424 425 426 427 428 429 430 431 432 433 434 435 436 437
 * Save the weights of filters in a format.
 */
function filter_admin_order_save($format, $weights) {
  foreach ($weights as $id => $weight) {
    list($module, $delta) = explode('/', $id);
    db_query("UPDATE filters SET weight = %d WHERE format = %d AND module = '%s' AND delta = %d", $weight, $format, $module, $delta);
  }
  drupal_set_message(t('The filter weights have been saved.'));

  cache_clear_all('filter:'. $format, true);

  drupal_goto('admin/filters/'. arg(2) .'/order');
}

/**
438
 * Menu callback; display settings defined by filters.
Dries's avatar
Dries committed
439
 */
440 441 442
function filter_admin_configure() {
  $format = arg(2);

Dries's avatar
 
Dries committed
443 444
  system_settings_save();

445 446 447 448 449
  $list = filter_list_format($format);
  $form = "";
  foreach ($list as $filter) {
    $form .= module_invoke($filter->module, 'filter', 'settings', $filter->delta, $format);
  }
Dries's avatar
 
Dries committed
450

451 452 453 454 455 456
  if (trim($form) != '') {
    $output = system_settings_form($form);
  }
  else {
    $output = t('No settings are available.');
  }
Dries's avatar
 
Dries committed
457

Dries's avatar
Dries committed
458
  print theme('page', $output);
459 460
}

Dries's avatar
Dries committed
461
/**
462
 * Retrieve a list of input formats.
Dries's avatar
Dries committed
463
 */
464 465 466 467 468 469 470 471 472 473 474
function filter_formats() {
  global $user;
  static $formats;

  // Administrators can always use all input formats.
  $all = user_access('administer filters');

  if (!isset($formats)) {
    $formats = array();

    $query = array('SELECT * FROM {filter_formats}');
475

476
    // Build query for selecting the format(s) based on the user's roles.
477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492
    if (!$all) {
      $where = array();
      foreach ($user->roles as $rid => $role) {
        $where[] = "roles LIKE '%%,%d,%%'";
        $query[] = $rid;
      }
      $query[0] .= ' WHERE '. implode(' OR ', $where);
    }

    $result = call_user_func_array('db_query', $query);
    while ($format = db_fetch_object($result)) {
      $formats[$format->format] = $format;
    }
  }
  return $formats;
}
493

494 495 496 497 498 499 500 501 502 503 504 505
/**
 * Build a list of all filters.
 */
function filter_list_all() {
  $filters = array();

  foreach (module_list() as $module) {
    $list = module_invoke($module, 'filter', 'list');
    if (is_array($list)) {
      foreach ($list as $delta => $name) {
        $filters[$module .'/'. $delta] = (object)array('module' => $module, 'delta' => $delta, 'name' => $name);
      }
Dries's avatar
 
Dries committed
506 507 508
    }
  }

509 510 511 512 513 514 515 516 517 518
  uasort($filters, '_filter_list_cmp');

  return $filters;
}

/**
 * Helper function for sorting the filter list by filter name.
 */
function _filter_list_cmp($a, $b) {
  return strcmp($a->name, $b->name);
Dries's avatar
 
Dries committed
519 520
}

Dries's avatar
Dries committed
521
/**
522
 * Check if text in a certain input format is allowed to be cached.
Dries's avatar
Dries committed
523
 */
524 525
function filter_format_allowcache($format) {
  static $cache = array();
Dries's avatar
 
Dries committed
526

527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
  if (!isset($cache[$format])) {
    $cache[$format] = db_result(db_query('SELECT cache FROM {filter_formats} WHERE format = %d', $format));
  }
  return $cache[$format];
}

/**
 * Retrieve a list of filters for a certain format.
 */
function filter_list_format($format) {
  static $filters = array();

  if (!is_array($filters[$format])) {
    $filters[$format] = array();
    $result = db_query("SELECT * FROM {filters} WHERE format = %d ORDER BY weight ASC", $format);
    while ($filter = db_fetch_object($result)) {
      $list = module_invoke($filter->module, 'filter', 'list');
      if (is_array($list) && isset($list[$filter->delta])) {
        $filter->name = $list[$filter->delta];
        $filters[$format][$filter->module .'/'. $filter->delta] = $filter;
Dries's avatar
 
Dries committed
547 548 549 550
      }
    }
  }

551
  return $filters[$format];
552 553
}

554 555 556 557 558 559 560 561 562
/**
 * @name Filtering functions
 *
 * Modules which need to have content filtered can use these functions to
 * interact with the filter system.
 *
 * @{
 */

Dries's avatar
Dries committed
563 564 565
/**
 * Run all the enabled filters on a piece of text.
 */
566
function check_output($text, $format = FILTER_FORMAT_DEFAULT) {
567
  if (isset($text)) {
568 569 570 571
    if ($format == FILTER_FORMAT_DEFAULT) {
      $format = variable_get('filter_default_format', 1);
    }

572
    // Check for a cached version of this piece of text.
573 574 575 576 577
    $id = 'filter:'. $format .':'. md5($text);
    if ($cached = cache_get($id)) {
      return $cached->data;
    }

578
    // See if caching is allowed for this format.
579
    $cache = filter_format_allowcache($format);
580 581

    // Convert all Windows and Mac newlines to a single newline,
582
    // so filters only need to deal with one possibility.
583 584
    $text = str_replace(array("\r\n", "\r"), "\n", $text);

585
    // Get a complete list of filters, ordered properly.
586
    $filters = filter_list_format($format);
Dries's avatar
 
Dries committed
587

Dries's avatar
Dries committed
588
    // Give filters the chance to escape HTML-like data such as code or formulas.
589 590
    foreach ($filters as $filter) {
      $text = module_invoke($filter->module, 'filter', 'prepare', $filter->delta, $format, $text);
Dries's avatar
 
Dries committed
591
    }
592

593
    // Perform filtering.
594 595
    foreach ($filters as $filter) {
      $text = module_invoke($filter->module, 'filter', 'process', $filter->delta, $format, $text);
596 597
    }

598
    // Store in cache.
599 600
    if ($cache) {
      cache_set($id, $text, 1);
601 602 603 604 605 606 607 608 609
    }
  }
  else {
    $text = message_na();
  }

  return $text;
}

Dries's avatar
Dries committed
610
/**
611
 * Generate a selector for choosing a format in a form.
612 613
 *
 * @param $name
614
 *   The internal name used to refer to the form element.
615
 * @param $value
616
 *   The ID of the format that is currently selected.
617
 * @return
618
 *   HTML for the form element.
Dries's avatar
Dries committed
619
 */
620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638
function filter_form($name, $value = FILTER_FORMAT_DEFAULT) {
  if ($value == FILTER_FORMAT_DEFAULT) {
    $value = variable_get('filter_default_format', 1);
  }
  $formats = filter_formats();

  $extra = l(t('More information about formatting options'), 'filter/tips');

  if (count($formats) > 1) {
    // Multiple formats available: display radio buttons with tips.
    $output = '';
    foreach ($formats as $format) {
      $tips = _filter_tips($format->format, false);

      // TODO: get support for block-level radios so the <br /> is not output?
      $output .= '<div>';
      $output .= '<label class="option"><input type="radio" class="form-radio" name="edit['. $name .']" value="'. $format->format .'"'. ($format->format == $value ? ' checked="checked"' : '') .' /> '. $format->name .'</label>';
      $output .= theme('filter_tips', $tips);
      $output .= '</div>';
639
    }
640
    return theme('form_element', t('Input format'), $output, $extra, $name, _form_get_error($name));
Dries's avatar
 
Dries committed
641
  }
642 643 644 645 646 647 648 649 650
  else {
    // Only one format available: use a hidden form item and only show tips.
    $format = array_shift($formats);
    $output = form_hidden($name, $format->format);
    $tips = _filter_tips(variable_get('filter_default_format', 0), false);
    $output .= form_item(t('Formatting guidelines'), theme('filter_tips', $tips, $extra), $extra);
    return $output;
  }
}
651

652 653 654 655 656 657
/**
 * Returns true if the user is allowed to access this format.
 */
function filter_access($format) {
  if (user_access('administer filters')) {
    return true;
658
  }
659 660 661 662 663 664
  else {
    $formats = filter_formats();
    return isset($formats[$format]);
  }
}
/* @} */
665

666
/**
667
 * Menu callback; show a page with long filter tips.
668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704
 */
function filter_tips_long() {
  $format = arg(2);
  if ($format) {
    $output = theme('filter_tips', _filter_tips($format, true));
  }
  else {
    $output = theme('filter_tips', _filter_tips(-1, true));
  }
  print theme('page', $output, t('Compose Tips'));
}

/**
 * Helper function for fetching filter tips.
 */
function _filter_tips($format, $long = false) {
  if ($format == -1) {
    $formats = filter_formats();
  }
  else {
    $formats = array(db_fetch_object(db_query("SELECT * FROM {filter_formats} WHERE format = %d", $format)));
  }

  $tips = array();

  foreach ($formats as $format) {
    $filters = filter_list_format($format->format);

    $tips[$format->name] = array();
    foreach ($filters as $id => $filter) {
      if ($tip = module_invoke($filter->module, 'filter_tips', $filter->delta, $format->format, $long)) {
        $tips[$format->name][] = array('tip' => $tip, 'id' => $id);
      }
    }
  }

  return $tips;
705 706
}

Dries's avatar
Dries committed
707
/**
708 709
 * @addtogroup themeable
 * @{
Dries's avatar
Dries committed
710
 */
711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751

/**
 * Format filter tips
 *
 * @param $tips
 * @param $long
 * @param $extra
 */
function theme_filter_tips($tips, $long = false, $extra = '') {
  $output = '';

  $multiple = count($tips) > 1;
  if ($multiple) {
    $output = t('Input formats') .':';
  }

  if (count($tips)) {
    if ($multiple) {
      $output .= '<ul>';
    }
    foreach ($tips as $name => $tiplist) {
      if ($multiple) {
        $output .= '<li>';
        $output .= '<strong>'. $name .'</strong>:<br />';
      }

      $output .= '<ul class="tips">';

      foreach ($tiplist as $tip) {
        $output .= '<li'. ($long ? ' id="'. $tip['id'] .'">' : '>') . $tip['tip'] . '</li>';
      }

      $output .= '</ul>';
      if ($multiple) {
        $output .= '</li>';
      }
    }
    if ($multiple) {
      $output .= '</ul>';
    }
  }
Dries's avatar
 
Dries committed
752 753 754 755

  return $output;
}

756 757
/** @} End of addtogroup themeable */

Dries's avatar
Dries committed
758
/**
759 760 761 762
 * @name Standard filters
 *
 * Filters implemented by the filter.module.
 * @{
Dries's avatar
Dries committed
763
 */
764 765

/**
766 767 768 769 770 771 772 773 774
 * Implementation of hook_filter(). Contains a basic set of essential filters.
 * - HTML filter:
 *     Validates user-supplied HTML, transforming it as necessary.
 * - PHP evaluator:
 *     Executes PHP code.
 * - Legacy filter:
 *     Handles URL upgrades from Drupal 4.1.
 * - Line break converter:
 *     Converts newlines into paragraph and break tags.
775 776
 */
function filter_filter($op, $delta = 0, $format = -1, $text = '') {
Dries's avatar
 
Dries committed
777
  switch ($op) {
778
    case 'list':
779
      return array(0 => t('HTML filter'), 1 => t('PHP evaluator'), 2 => t('Legacy filter'), 3 => t('Line break converter'));
780 781

    case 'no cache':
782
      return $delta == 1; // No caching for the PHP evaluator.
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797

    case 'description':
      switch ($delta) {
        case 0:
          return t('Allows you to restrict if users can post HTML and which tags to filter out.');
        case 1:
          return t('Runs a piece of PHP code. The usage of this filter should be restricted to administrators only!');
        case 2:
          return t('Replaces URLs from Drupal 4.1 (and lower) with updated equivalents.');
        case 3:
          return t('Converts line breaks into HTML (i.e. &lt;br&gt; and &lt;p&gt; tags).');
        default:
          return;
      }

Dries's avatar
Dries committed
798
    case 'process':
799 800 801 802 803 804 805 806 807 808 809
      switch ($delta) {
        case 0:
          return _filter_html($text, $format);
        case 1:
          return drupal_eval($text);
        case 2:
          return _filter_old_urls($text, $format);
        case 3:
          return _filter_autop($text, $format);
        default:
          return $text;
Dries's avatar
 
Dries committed
810
      }
811

Dries's avatar
Dries committed
812
    case 'settings':
813 814 815 816 817 818 819
      switch ($delta) {
        case 0:
          return _filter_html_settings($format);
        default:
          return;
      }

Dries's avatar
 
Dries committed
820 821 822 823 824
    default:
      return $text;
  }
}

825
/**
826
 * Settings for the HTML filter.
827 828 829 830 831 832 833 834 835 836 837
 */
function _filter_html_settings($format) {
  $group = form_radios(t('Filter HTML tags'), "filter_html_$format", variable_get("filter_html_$format", FILTER_HTML_STRIP), array(FILTER_HTML_STRIP => t('Strip tags'), FILTER_HTML_ESCAPE => t('Escape tags')), t('How to deal with HTML tags in user-contributed content. If set to "Strip tags", dangerous tags are removed (see below).  If set to "Escape tags", all HTML is escaped and presented as it was typed.'));
  $group .= form_textfield(t('Allowed HTML tags'), "allowed_html_$format", variable_get("allowed_html_$format", '<a> <b> <dd> <dl> <dt> <i> <li> <ol> <u> <ul>'), 64, 255, t('If "Strip tags" is selected, optionally specify tags which should not be stripped. Javascript event attributes are always stripped.'));
  $group .= form_radios(t('HTML style attributes'), "filter_style_$format", variable_get("filter_style_$format", FILTER_STYLE_STRIP), array(FILTER_STYLE_ALLOW => t('Allowed'), FILTER_STYLE_STRIP => t('Removed')), t('If "Strip tags" is selected, you can choose whether "STYLE" attributes are allowed or removed from input.'));
  $output .= form_group(t('HTML filter'), $group);

  return $output;
}

/**
838
 * HTML filter. Provides filtering of input into accepted HTML.
839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857
 */
function _filter_html($text, $format) {
  if (variable_get("filter_html_$format", FILTER_HTML_STRIP) == FILTER_HTML_STRIP) {
    // Allow users to enter HTML, but filter it
    $text = strip_tags($text, variable_get("allowed_html_$format", ''));
    if (variable_get("filter_style_$format", FILTER_STYLE_STRIP)) {
      $text = preg_replace('/\Wstyle\s*=[^>]+?>/i', '>', $text);
    }
    $text = preg_replace('/\Won[a-z]+\s*=[^>]+?>/i', '>', $text);
  }

  if (variable_get("filter_html_$format", FILTER_HTML_STRIP) == FILTER_HTML_ESCAPE) {
    // Escape HTML
    $text = htmlspecialchars($text);
  }

  return trim($text);
}

Dries's avatar
Dries committed
858 859 860 861 862 863 864 865 866
/**
 * Rewrite legacy URLs.
 *
 * This is a *temporary* filter to rewrite old-style URLs to new-style
 * URLs (clean URLs).  Currently, URLs are being rewritten dynamically
 * (ie. "on output"), however when these rewrite rules have been tested
 * enough, we will use them to permanently rewrite the links in node
 * and comment bodies.
 */
867 868 869 870 871
function _filter_old_urls($text) {
  if (!variable_get('rewrite_old_urls', 0)) {
    return $text;
  }

872 873 874 875
  global $base_url;

  $end = substr($base_url, 12);

Dries's avatar
Dries committed
876 877
  if (variable_get('clean_url', '0') == '0') {
    // Relative URLs:
878 879 880 881 882 883 884 885 886

    // rewrite 'node.php?id=<number>[&cid=<number>]' style URLs:
    $text = eregi_replace("\"(node)\.php\?id=([[:digit:]]+)(&cid=)?([[:digit:]]*)", "\"?q=\\1/view/\\2/\\4", $text);

    // rewrite 'module.php?mod=<name>{&<op>=<value>}' style URLs:
    $text = ereg_replace("\"module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "\"?q=\\2/\\4/\\6" , $text);
    $text = ereg_replace("\"module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "\"?q=\\2/\\4", $text);
    $text = ereg_replace("\"module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))", "\"?q=\\2", $text);

Dries's avatar
Dries committed
887
    // Absolute URLs:
888 889 890 891 892 893 894 895 896 897

    // rewrite 'node.php?id=<number>[&cid=<number>]' style URLs:
    $text = eregi_replace("$end/(node)\.php\?id=([[:digit:]]+)(&cid=)?([[:digit:]]*)", "$end/?q=\\1/view/\\2/\\4", $text);

    // rewrite 'module.php?mod=<name>{&<op>=<value>}' style URLs:
    $text = ereg_replace("$end/module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "$end/?q=\\2/\\4/\\6" , $text);
    $text = ereg_replace("$end/module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "$end/?q=\\2/\\4", $text);
    $text = ereg_replace("$end/module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))", "\"$end/?q=\\2", $text);
  }
  else {
Dries's avatar
Dries committed
898
    // Relative URLs:
899 900 901 902 903 904 905 906 907

    // rewrite 'node.php?id=<number>[&cid=<number>]' style URLs:
    $text = eregi_replace("\"(node)\.php\?id=([[:digit:]]+)(&cid=)?([[:digit:]]*)", "\"\\1/view/\\2/\\4", $text);

    // rewrite 'module.php?mod=<name>{&<op>=<value>}' style URLs:
    $text = ereg_replace("\"module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "\"\\2/\\4/\\6", $text);
    $text = ereg_replace("\"module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "\"\\2/\\4", $text);
    $text = ereg_replace("\"module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))", "\"\\2", $text);

Dries's avatar
Dries committed
908
    // Absolute URLs:
909 910 911 912 913 914 915 916 917 918 919 920 921

    // rewrite 'node.php?id=<number>[&cid=<number>]' style URLs:
    $text = eregi_replace("$end/(node)\.php\?id=([[:digit:]]+)(&cid=)?([[:digit:]]*)", "$end/\\1/view/\\2/\\4", $text);

    // rewrite 'module.php?mod=<name>{&<op>=<value>}' style URLs:
    $text = ereg_replace("$end/module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "$end/\\2/\\4/\\6", $text);
    $text = ereg_replace("$end/module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))(&?[[:alpha:]]+=([[:alnum:]]+))", "$end/\\2/\\4", $text);
    $text = ereg_replace("$end/module\.php\?(&?[[:alpha:]]+=([[:alnum:]]+))", "$end/\\2", $text);
  }

  return $text;
}

Dries's avatar
Dries committed
922
/**
923 924
 * Convert line breaks into <p> and <br> in an intelligent fashion.
 * From: http://photomatt.net/scripts/autop
Dries's avatar
Dries committed
925
 */
926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
function _filter_autop($text, $br = 1) {
  $text = preg_replace('|\n*$|', '', $text) ."\n\n"; // just to make things a little easier, pad the end
  $text = preg_replace('|<br />\s*<br />|', "\n\n", $text);
  $text = preg_replace('!(<(?:table|ul|ol|li|pre|form|blockquote|h[1-6])[^>]*>)!', "\n$1", $text); // Space things out a little
  $text = preg_replace('!(</(?:table|ul|ol|li|pre|form|blockquote|h[1-6])>)!', "$1\n", $text); // Space things out a little
  $text = preg_replace("/\n\n+/", "\n\n", $text); // take care of duplicates
  $text = preg_replace('/\n?(.+?)(?:\n\s*\n|\z)/s', "\t<p>$1</p>\n", $text); // make paragraphs, including one at the end
  $text = preg_replace('|<p>\s*?</p>|', '', $text); // under certain strange conditions it could create a P of entirely whitespace
  $text = preg_replace("|<p>(<li.+?)</p>|", "$1", $text); // problem with nested lists
  $text = preg_replace('|<p><blockquote([^>]*)>|i', "<blockquote$1><p>", $text);
  $text = str_replace('</blockquote></p>', '</p></blockquote>', $text);
  $text = preg_replace('!<p>\s*(</?(?:table|tr|td|th|div|ul|ol|li|pre|select|form|blockquote|p|h[1-6])[^>]*>)!', "$1", $text);
  $text = preg_replace('!(</?(?:table|tr|td|th|div|ul|ol|li|pre|select|form|blockquote|p|h[1-6])[^>]*>)\s*</p>!', "$1", $text);
  if ($br) $text = preg_replace('|(?<!<br />)\s*\n|', "<br />\n", $text); // optionally make line breaks
  $text = preg_replace('!(</?(?:table|tr|td|th|div|dl|dd|dt|ul|ol|li|pre|select|form|blockquote|p|h[1-6])[^>]*>)\s*<br />!', "$1", $text);
  $text = preg_replace('!<br />(\s*</?(?:p|li|div|th|pre|td|ul|ol)>)!', '$1', $text);
  $text = preg_replace('/&([^#])(?![a-z]{1,8};)/', '&#038;$1', $text);
Dries's avatar
 
Dries committed
943

944
  return $text;
Dries's avatar
 
Dries committed
945 946
}

947 948
/* @} */

Dries's avatar
 
Dries committed
949
?>