common.inc 51.2 KB
Newer Older
Dries's avatar
 
Dries committed
1
<?php
2
// $Id$
Dries's avatar
 
Dries committed
3

Dries's avatar
 
Dries committed
4 5 6 7 8 9 10 11
/**
 * @file
 * Common functions that many Drupal modules will need to reference.
 *
 * The functions that are critical and need to be available even when serving
 * a cached page are instead located in bootstrap.inc.
 */

12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
/**
 * Return status for saving which involved creating a new item.
 */
define('SAVED_NEW', 1);

/**
 * Return status for saving which involved an update to an existing item.
 */
define('SAVED_UPDATED', 2);

/**
 * Return status for saving which deleted an existing item.
 */
define('SAVED_DELETED', 3);

27 28 29 30 31 32 33 34 35
/**
 * Set content for a specified region.
 *
 * @param $region
 *   Page region the content is assigned to.
 *
 * @param $data
 *   Content to be set.
 */
36
function drupal_set_content($region = NULL, $data = NULL) {
37 38 39 40 41 42 43 44 45 46 47 48
  static $content = array();

  if (!is_null($region) && !is_null($data)) {
    $content[$region][] = $data;
  }
  return $content;
}

/**
 * Get assigned content.
 *
 * @param $region
49
 *   A specified region to fetch content for. If NULL, all regions will be returned.
50 51 52 53
 *
 * @param $delimiter
 *   Content to be inserted between exploded array elements.
 */
54
function drupal_get_content($region = NULL, $delimiter = ' ') {
55
  $content = drupal_set_content();
56 57
  if (isset($region)) {
    if (isset($content[$region]) && is_array($content[$region])) {
Steven Wittens's avatar
Steven Wittens committed
58
      return implode($delimiter, $content[$region]);
59
    }
60 61 62 63
  }
  else {
    foreach (array_keys($content) as $region) {
      if (is_array($content[$region])) {
Steven Wittens's avatar
Steven Wittens committed
64
        $content[$region] = implode($delimiter, $content[$region]);
65 66 67 68 69 70
      }
    }
    return $content;
  }
}

Dries's avatar
 
Dries committed
71
/**
Dries's avatar
 
Dries committed
72
 * Set the breadcrumb trail for the current page.
Dries's avatar
 
Dries committed
73
 *
Dries's avatar
 
Dries committed
74 75 76
 * @param $breadcrumb
 *   Array of links, starting with "home" and proceeding up to but not including
 *   the current page.
Kjartan's avatar
Kjartan committed
77
 */
Dries's avatar
 
Dries committed
78 79 80
function drupal_set_breadcrumb($breadcrumb = NULL) {
  static $stored_breadcrumb;

81
  if (!is_null($breadcrumb)) {
Dries's avatar
 
Dries committed
82 83 84 85 86
    $stored_breadcrumb = $breadcrumb;
  }
  return $stored_breadcrumb;
}

Dries's avatar
 
Dries committed
87 88 89
/**
 * Get the breadcrumb trail for the current page.
 */
Dries's avatar
 
Dries committed
90 91 92
function drupal_get_breadcrumb() {
  $breadcrumb = drupal_set_breadcrumb();

93
  if (is_null($breadcrumb)) {
Dries's avatar
 
Dries committed
94 95 96 97 98 99
    $breadcrumb = menu_get_active_breadcrumb();
  }

  return $breadcrumb;
}

Dries's avatar
Dries committed
100
/**
Dries's avatar
 
Dries committed
101
 * Add output to the head tag of the HTML page.
Dries's avatar
 
Dries committed
102
 * This function can be called as long the headers aren't sent.
Dries's avatar
Dries committed
103 104
 */
function drupal_set_html_head($data = NULL) {
Dries's avatar
 
Dries committed
105
  static $stored_head = '';
Dries's avatar
Dries committed
106 107

  if (!is_null($data)) {
Dries's avatar
 
Dries committed
108
    $stored_head .= $data ."\n";
Dries's avatar
Dries committed
109 110 111 112
  }
  return $stored_head;
}

Dries's avatar
 
Dries committed
113 114 115
/**
 * Retrieve output to be displayed in the head tag of the HTML page.
 */
Dries's avatar
Dries committed
116
function drupal_get_html_head() {
Dries's avatar
 
Dries committed
117
  $output = "<meta http-equiv=\"Content-Type\" content=\"text/html; charset=utf-8\" />\n";
Dries's avatar
Dries committed
118 119 120
  return $output . drupal_set_html_head();
}

Dries's avatar
 
Dries committed
121
/**
122
 * Reset the static variable which holds the aliases mapped for this request.
Dries's avatar
 
Dries committed
123
 */
124 125
function drupal_clear_path_cache() {
  drupal_lookup_path('wipe');
Dries's avatar
 
Dries committed
126
}
Kjartan's avatar
Kjartan committed
127

Dries's avatar
Dries committed
128
/**
Dries's avatar
 
Dries committed
129
 * Set an HTTP response header for the current page.
Dries's avatar
Dries committed
130 131
 */
function drupal_set_header($header = NULL) {
132
  // We use an array to guarantee there are no leading or trailing delimiters.
Dries's avatar
 
Dries committed
133
  // Otherwise, header('') could get called when serving the page later, which
134 135
  // ends HTTP headers prematurely on some PHP versions.
  static $stored_headers = array();
Dries's avatar
Dries committed
136

137
  if (strlen($header)) {
Dries's avatar
Dries committed
138
    header($header);
139
    $stored_headers[] = $header;
Dries's avatar
Dries committed
140
  }
141
  return implode("\n", $stored_headers);
Dries's avatar
Dries committed
142 143
}

Dries's avatar
 
Dries committed
144 145 146
/**
 * Get the HTTP response headers for the current page.
 */
Dries's avatar
Dries committed
147 148 149 150
function drupal_get_headers() {
  return drupal_set_header();
}

Dries's avatar
 
Dries committed
151 152 153
/**
 * @name HTTP handling
 * @{
Dries's avatar
 
Dries committed
154
 * Functions to properly handle HTTP responses.
Dries's avatar
 
Dries committed
155 156
 */

157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174
/**
 * Parse an array into a valid urlencoded query string.
 *
 * @param $query
 *   The array to be processed e.g. $_GET
 * @param $exclude
 *   The array filled with keys to be excluded. Use parent[child] to exclude nested items.
 * @param $urlencode
 *   If TRUE, the keys and values are both urlencoded.
 * @param $parent
 *   Should not be passed, only used in recursive calls
 * @return
 *   urlencoded string which can be appended to/as the URL query string
 */
function drupal_query_string_encode($query, $exclude = array(), $parent = '') {
  $params = array();

  foreach ($query as $key => $value) {
175
    $key = drupal_urlencode($key);
176
    if ($parent) {
177
      $key = $parent .'['. $key .']';
178 179
    }

180
    if (in_array($key, $exclude)) {
181 182 183 184 185 186 187
      continue;
    }

    if (is_array($value)) {
      $params[] = drupal_query_string_encode($value, $exclude, $key);
    }
    else {
188
      $params[] = $key .'='. drupal_urlencode($value);
189 190 191 192 193 194
    }
  }

  return implode('&', $params);
}

195 196
/**
 * Prepare a destination query string for use in combination with
197 198 199
 * drupal_goto(). Used to direct the user back to the referring page
 * after completing a form. By default the current URL is returned.
 * If a destination exists in the previous request, that destination
200
 * is returned. As such, a destination can persist across multiple
201
 * pages.
202 203 204 205
 *
 * @see drupal_goto()
 */
function drupal_get_destination() {
206
  if (isset($_REQUEST['destination'])) {
207 208 209
    return 'destination='. urlencode($_REQUEST['destination']);
  }
  else {
210 211
    // Use $_REQUEST here to retrieve the original path.
    $path = isset($_REQUEST['q']) ? $_REQUEST['q'] : '';
212 213 214
    $query = drupal_query_string_encode($_GET, array('q'));
    if ($query != '') {
      $path .= '?'. $query;
215
    }
216
    return 'destination='. urlencode($path);
217 218 219
  }
}

Kjartan's avatar
Kjartan committed
220
/**
Dries's avatar
 
Dries committed
221
 * Send the user to a different Drupal page.
Kjartan's avatar
Kjartan committed
222
 *
Dries's avatar
 
Dries committed
223 224
 * This issues an on-site HTTP redirect. The function makes sure the redirected
 * URL is formatted correctly.
Kjartan's avatar
Kjartan committed
225
 *
226
 * Usually the redirected URL is constructed from this function's input
227
 * parameters. However you may override that behavior by setting a
228 229
 * <em>destination</em> in either the $_REQUEST-array (i.e. by using
 * the query string of an URI) or the $_REQUEST['edit']-array (i.e. by
230 231
 * using a hidden form field). This is used to direct the user back to
 * the proper page after completing a form. For example, after editing
232
 * a post on the 'admin/content/node'-page or after having logged on using the
233
 * 'user login'-block in a sidebar. The function drupal_get_destination()
234 235
 * can be used to help set the destination URL.
 *
Dries's avatar
 
Dries committed
236 237 238 239 240 241 242 243 244 245 246 247 248
 * It is advised to use drupal_goto() instead of PHP's header(), because
 * drupal_goto() will append the user's session ID to the URI when PHP is
 * compiled with "--enable-trans-sid".
 *
 * This function ends the request; use it rather than a print theme('page')
 * statement in your menu callback.
 *
 * @param $path
 *   A Drupal path.
 * @param $query
 *   The query string component, if any.
 * @param $fragment
 *   The destination fragment identifier (named anchor).
249 250
 *
 * @see drupal_get_destination()
Kjartan's avatar
Kjartan committed
251
 */
Dries's avatar
 
Dries committed
252
function drupal_goto($path = '', $query = NULL, $fragment = NULL) {
253
  if (isset($_REQUEST['destination'])) {
254 255
    extract(parse_url($_REQUEST['destination']));
  }
256
  else if (isset($_REQUEST['edit']['destination'])) {
257 258 259
    extract(parse_url($_REQUEST['edit']['destination']));
  }

260
  $url = url($path, $query, $fragment, TRUE);
Kjartan's avatar
Kjartan committed
261

Dries's avatar
 
Dries committed
262 263 264 265
  // Before the redirect, allow modules to react to the end of the page request.
  module_invoke_all('exit', $url);

  header('Location: '. $url);
Kjartan's avatar
Kjartan committed
266

Dries's avatar
 
Dries committed
267 268 269
  // The "Location" header sends a REDIRECT status code to the http
  // daemon. In some cases this can go wrong, so we make sure none
  // of the code below the drupal_goto() call gets executed when we redirect.
Kjartan's avatar
Kjartan committed
270 271 272
  exit();
}

273
/**
274
 * Generates a site off-line message
275 276
 */
function drupal_site_offline() {
277
  drupal_set_header('HTTP/1.0 503 Service unavailable');
278
  drupal_set_title(t('Site off-line'));
279 280
  print theme('maintenance_page', filter_xss_admin(variable_get('site_offline_message',
    t('%site is currently under maintenance. We should be back shortly. Thank you for your patience.', array('%site' => variable_get('site_name', t('This Drupal site')))))));
281 282
}

Kjartan's avatar
Kjartan committed
283 284 285
/**
 * Generates a 404 error if the request can not be handled.
 */
Dries's avatar
 
Dries committed
286
function drupal_not_found() {
287
  drupal_set_header('HTTP/1.0 404 Not Found');
288
  watchdog('page not found', t('%page not found.', array('%page' => theme('placeholder', $_GET['q']))), WATCHDOG_WARNING);
Dries's avatar
 
Dries committed
289

290 291 292 293 294
  // Keep old path for reference
  if (!isset($_REQUEST['destination'])) {
    $_REQUEST['destination'] = $_GET['q'];
  }

Dries's avatar
 
Dries committed
295
  $path = drupal_get_normal_path(variable_get('site_404', ''));
296
  if ($path && $path != $_GET['q']) {
Dries's avatar
 
Dries committed
297
    menu_set_active_item($path);
298
    $return = menu_execute_active_handler();
Dries's avatar
 
Dries committed
299
  }
300
  else {
301
    // Redirect to a non-existent menu item to make possible tabs disappear.
302
    menu_set_active_item('');
303
  }
Dries's avatar
 
Dries committed
304

305
  if (empty($return)) {
306
    drupal_set_title(t('Page not found'));
Dries's avatar
 
Dries committed
307
  }
308
  print theme('page', $return);
Dries's avatar
 
Dries committed
309
}
Dries's avatar
 
Dries committed
310

Dries's avatar
 
Dries committed
311 312 313 314
/**
 * Generates a 403 error if the request is not allowed.
 */
function drupal_access_denied() {
315
  drupal_set_header('HTTP/1.0 403 Forbidden');
316
  watchdog('access denied', t('%page denied access.', array('%page' => theme('placeholder', $_GET['q']))), WATCHDOG_WARNING, l(t('view'), $_GET['q']));
Dries's avatar
 
Dries committed
317

318 319 320 321 322
  // Keep old path for reference
  if (!isset($_REQUEST['destination'])) {
    $_REQUEST['destination'] = $_GET['q'];
  }

Dries's avatar
 
Dries committed
323
  $path = drupal_get_normal_path(variable_get('site_403', ''));
324
  if ($path && $path != $_GET['q']) {
Dries's avatar
 
Dries committed
325
    menu_set_active_item($path);
326
    $return = menu_execute_active_handler();
Dries's avatar
 
Dries committed
327
  }
328
  else {
329
    // Redirect to a non-existent menu item to make possible tabs disappear.
330
    menu_set_active_item('');
331
  }
Dries's avatar
 
Dries committed
332

333
  if (empty($return)) {
334
    drupal_set_title(t('Access denied'));
335
    $return = t('You are not authorized to access this page.');
Dries's avatar
 
Dries committed
336
  }
337
  print theme('page', $return);
Dries's avatar
 
Dries committed
338 339
}

Dries's avatar
 
Dries committed
340
/**
Dries's avatar
 
Dries committed
341
 * Perform an HTTP request.
Dries's avatar
 
Dries committed
342
 *
Dries's avatar
 
Dries committed
343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359
 * This is a flexible and powerful HTTP client implementation. Correctly handles
 * GET, POST, PUT or any other HTTP requests. Handles redirects.
 *
 * @param $url
 *   A string containing a fully qualified URI.
 * @param $headers
 *   An array containing an HTTP header => value pair.
 * @param $method
 *   A string defining the HTTP request to use.
 * @param $data
 *   A string containing data to include in the request.
 * @param $retry
 *   An integer representing how many times to retry the request in case of a
 *   redirect.
 * @return
 *   An object containing the HTTP request headers, response code, headers,
 *   data, and redirect status.
Dries's avatar
 
Dries committed
360 361
 */
function drupal_http_request($url, $headers = array(), $method = 'GET', $data = NULL, $retry = 3) {
Dries's avatar
 
Dries committed
362 363
  $result = new StdClass();

Dries's avatar
 
Dries committed
364
  // Parse the URL, and make sure we can handle the schema.
Dries's avatar
 
Dries committed
365 366 367
  $uri = parse_url($url);
  switch ($uri['scheme']) {
    case 'http':
Dries's avatar
Dries committed
368
      $port = isset($uri['port']) ? $uri['port'] : 80;
369
      $host = $uri['host'] . ($port != 80 ? ':'. $port : '');
370
      $fp = @fsockopen($uri['host'], $port, $errno, $errstr, 15);
Dries's avatar
 
Dries committed
371 372
      break;
    case 'https':
Dries's avatar
 
Dries committed
373
      // Note: Only works for PHP 4.3 compiled with OpenSSL.
Dries's avatar
Dries committed
374
      $port = isset($uri['port']) ? $uri['port'] : 443;
375
      $host = $uri['host'] . ($port != 443 ? ':'. $port : '');
376
      $fp = @fsockopen('ssl://'. $uri['host'], $port, $errno, $errstr, 20);
Dries's avatar
 
Dries committed
377 378
      break;
    default:
Dries's avatar
 
Dries committed
379
      $result->error = 'invalid schema '. $uri['scheme'];
Dries's avatar
 
Dries committed
380 381 382
      return $result;
  }

Dries's avatar
 
Dries committed
383
  // Make sure the socket opened properly.
Dries's avatar
 
Dries committed
384
  if (!$fp) {
Dries's avatar
 
Dries committed
385
    $result->error = trim($errno .' '. $errstr);
Dries's avatar
 
Dries committed
386 387 388
    return $result;
  }

Dries's avatar
 
Dries committed
389
  // Construct the path to act on.
Dries's avatar
Dries committed
390 391
  $path = isset($uri['path']) ? $uri['path'] : '/';
  if (isset($uri['query'])) {
Dries's avatar
 
Dries committed
392
    $path .= '?'. $uri['query'];
Dries's avatar
 
Dries committed
393 394
  }

Dries's avatar
 
Dries committed
395
  // Create HTTP request.
Dries's avatar
 
Dries committed
396
  $defaults = array(
397 398 399 400
    // RFC 2616: "non-standard ports MUST, default ports MAY be included".
    // We don't add the port to prevent from breaking rewrite rules checking
    // the host that do not take into account the port number.
    'Host' => "Host: $host",
401
    'User-Agent' => 'User-Agent: Drupal (+http://drupal.org/)',
402
    'Content-Length' => 'Content-Length: '. strlen($data)
Dries's avatar
 
Dries committed
403 404 405
  );

  foreach ($headers as $header => $value) {
Dries's avatar
 
Dries committed
406
    $defaults[$header] = $header .': '. $value;
Dries's avatar
 
Dries committed
407 408
  }

Dries's avatar
 
Dries committed
409
  $request = $method .' '. $path ." HTTP/1.0\r\n";
Dries's avatar
 
Dries committed
410 411 412
  $request .= implode("\r\n", $defaults);
  $request .= "\r\n\r\n";
  if ($data) {
Dries's avatar
 
Dries committed
413
    $request .= $data ."\r\n";
Dries's avatar
 
Dries committed
414 415 416 417 418 419
  }
  $result->request = $request;

  fwrite($fp, $request);

  // Fetch response.
420
  $response = '';
421 422
  while (!feof($fp) && $chunk = fread($fp, 1024)) {
    $response .= $chunk;
Dries's avatar
 
Dries committed
423 424 425 426
  }
  fclose($fp);

  // Parse response.
427 428
  list($split, $result->data) = explode("\r\n\r\n", $response, 2);
  $split = preg_split("/\r\n|\n|\r/", $split);
429

430
  list($protocol, $code, $text) = explode(' ', trim(array_shift($split)), 3);
Dries's avatar
 
Dries committed
431 432 433
  $result->headers = array();

  // Parse headers.
434
  while ($line = trim(array_shift($split))) {
Dries's avatar
 
Dries committed
435
    list($header, $value) = explode(':', $line, 2);
436 437 438 439 440 441 442 443
    if (isset($result->headers[$header]) && $header == 'Set-Cookie') {
      // RFC 2109: the Set-Cookie response header comprises the token Set-
      // Cookie:, followed by a comma-separated list of one or more cookies.
      $result->headers[$header] .= ','. trim($value);
    }
    else {
      $result->headers[$header] = trim($value);
    }
Dries's avatar
 
Dries committed
444 445 446 447 448 449 450 451 452 453
  }

  $responses = array(
    100 => 'Continue', 101 => 'Switching Protocols',
    200 => 'OK', 201 => 'Created', 202 => 'Accepted', 203 => 'Non-Authoritative Information', 204 => 'No Content', 205 => 'Reset Content', 206 => 'Partial Content',
    300 => 'Multiple Choices', 301 => 'Moved Permanently', 302 => 'Found', 303 => 'See Other', 304 => 'Not Modified', 305 => 'Use Proxy', 307 => 'Temporary Redirect',
    400 => 'Bad Request', 401 => 'Unauthorized', 402 => 'Payment Required', 403 => 'Forbidden', 404 => 'Not Found', 405 => 'Method Not Allowed', 406 => 'Not Acceptable', 407 => 'Proxy Authentication Required', 408 => 'Request Time-out', 409 => 'Conflict', 410 => 'Gone', 411 => 'Length Required', 412 => 'Precondition Failed', 413 => 'Request Entity Too Large', 414 => 'Request-URI Too Large', 415 => 'Unsupported Media Type', 416 => 'Requested range not satisfiable', 417 => 'Expectation Failed',
    500 => 'Internal Server Error', 501 => 'Not Implemented', 502 => 'Bad Gateway', 503 => 'Service Unavailable', 504 => 'Gateway Time-out', 505 => 'HTTP Version not supported'
  );
  // RFC 2616 states that all unknown HTTP codes must be treated the same as
Dries's avatar
 
Dries committed
454
  // the base code in their class.
Dries's avatar
 
Dries committed
455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481
  if (!isset($responses[$code])) {
    $code = floor($code / 100) * 100;
  }

  switch ($code) {
    case 200: // OK
    case 304: // Not modified
      break;
    case 301: // Moved permanently
    case 302: // Moved temporarily
    case 307: // Moved temporarily
      $location = $result->headers['Location'];

      if ($retry) {
        $result = drupal_http_request($result->headers['Location'], $headers, $method, $data, --$retry);
        $result->redirect_code = $result->code;
      }
      $result->redirect_url = $location;

      break;
    default:
      $result->error = $text;
  }

  $result->code = $code;
  return $result;
}
Dries's avatar
 
Dries committed
482 483 484
/**
 * @} End of "HTTP handling".
 */
Dries's avatar
 
Dries committed
485

Dries's avatar
 
Dries committed
486
/**
Dries's avatar
 
Dries committed
487 488
 * Log errors as defined by administrator
 * Error levels:
489 490
 *  0 = Log errors to database.
 *  1 = Log errors to database and to screen.
Dries's avatar
 
Dries committed
491
 */
Dries's avatar
 
Dries committed
492
function error_handler($errno, $message, $filename, $line) {
493 494 495 496 497
  // If the @ error suppression operator was used, error_reporting is temporarily set to 0
  if (error_reporting() == 0) {
    return;
  }

498
  if ($errno & (E_ALL ^ E_NOTICE)) {
Dries's avatar
 
Dries committed
499 500
    $types = array(1 => 'error', 2 => 'warning', 4 => 'parse error', 8 => 'notice', 16 => 'core error', 32 => 'core warning', 64 => 'compile error', 128 => 'compile warning', 256 => 'user error', 512 => 'user warning', 1024 => 'user notice', 2048 => 'strict warning');
    $entry = $types[$errno] .': '. $message .' in '. $filename .' on line '. $line .'.';
Dries's avatar
 
Dries committed
501

502
    // Force display of error messages in update.php
503
    if (variable_get('error_level', 1) == 1 || strstr($_SERVER['PHP_SELF'], 'update.php')) {
504
      drupal_set_message($entry, 'error');
Dries's avatar
Dries committed
505
    }
506 507

    watchdog('php', t('%message in %file on line %line.', array('%error' => $types[$errno], '%message' => $message, '%file' => $filename, '%line' => $line)), WATCHDOG_ERROR);
Dries's avatar
 
Dries committed
508 509 510
  }
}

Dries's avatar
 
Dries committed
511
function _fix_gpc_magic(&$item) {
Dries's avatar
Dries committed
512
  if (is_array($item)) {
Kjartan's avatar
Kjartan committed
513 514 515
    array_walk($item, '_fix_gpc_magic');
  }
  else {
Kjartan's avatar
Kjartan committed
516
    $item = stripslashes($item);
Dries's avatar
 
Dries committed
517 518 519
  }
}

Dries's avatar
 
Dries committed
520 521 522 523
/**
 * Correct double-escaping problems caused by "magic quotes" in some PHP
 * installations.
 */
Dries's avatar
 
Dries committed
524
function fix_gpc_magic() {
525
  static $fixed = FALSE;
Dries's avatar
 
Dries committed
526
  if (!$fixed && ini_get('magic_quotes_gpc')) {
Dries's avatar
Dries committed
527 528 529 530
    array_walk($_GET, '_fix_gpc_magic');
    array_walk($_POST, '_fix_gpc_magic');
    array_walk($_COOKIE, '_fix_gpc_magic');
    array_walk($_REQUEST, '_fix_gpc_magic');
531
    $fixed = TRUE;
Dries's avatar
Dries committed
532
  }
Dries's avatar
 
Dries committed
533 534
}

Dries's avatar
 
Dries committed
535 536 537
/**
 * Initialize the localization system.
 */
Dries's avatar
 
Dries committed
538 539
function locale_initialize() {
  global $user;
Dries's avatar
 
Dries committed
540 541 542 543 544

  if (function_exists('i18n_get_lang')) {
    return i18n_get_lang();
  }

Dries's avatar
 
Dries committed
545 546 547 548 549
  if (function_exists('locale')) {
    $languages = locale_supported_languages();
    $languages = $languages['name'];
  }
  else {
550 551 552
    // Ensure the locale/language is correctly returned, even without locale.module.
    // Useful for e.g. XML/HTML 'lang' attributes.
    $languages = array('en' => 'English');
Dries's avatar
 
Dries committed
553
  }
554
  if ($user->uid && isset($languages[$user->language])) {
Dries's avatar
 
Dries committed
555 556 557 558 559
    return $user->language;
  }
  else {
    return key($languages);
  }
Dries's avatar
 
Dries committed
560 561
}

Kjartan's avatar
Kjartan committed
562
/**
Dries's avatar
 
Dries committed
563
 * Translate strings to the current locale.
Kjartan's avatar
Kjartan committed
564
 *
565
 * When using t(), try to put entire sentences and strings in one t() call.
Dries's avatar
 
Dries committed
566 567 568 569
 * This makes it easier for translators. HTML markup within translation strings
 * is acceptable, if necessary. The suggested syntax for a link embedded
 * within a translation string is:
 * @code
Dries's avatar
 
Dries committed
570 571 572
 *   $msg = t('You must log in below or <a href="%url">create a new
 *             account</a> before viewing the next page.', array('%url'
 *             => url('user/register')));
Dries's avatar
 
Dries committed
573
 * @endcode
574 575 576
 * We suggest the same syntax for links to other sites. This makes it easy to
 * change link URLs if needed (which happens often) without requiring updates
 * to translations.
Kjartan's avatar
Kjartan committed
577
 *
Dries's avatar
 
Dries committed
578
 * @param $string
Dries's avatar
 
Dries committed
579
 *   A string containing the English string to translate.
Dries's avatar
 
Dries committed
580 581
 * @param $args
 *   An associative array of replacements to make after translation. Incidences
Dries's avatar
 
Dries committed
582
 *   of any key in this array are replaced with the corresponding value.
Dries's avatar
 
Dries committed
583 584
 * @return
 *   The translated string.
Kjartan's avatar
Kjartan committed
585
 */
Dries's avatar
 
Dries committed
586
function t($string, $args = 0) {
Dries's avatar
 
Dries committed
587 588 589 590
  global $locale;
  if (function_exists('locale') && $locale != 'en') {
    $string = locale($string);
  }
591

Dries's avatar
 
Dries committed
592 593
  if (!$args) {
    return $string;
Kjartan's avatar
Kjartan committed
594 595
  }
  else {
Dries's avatar
 
Dries committed
596 597
    return strtr($string, $args);
  }
Dries's avatar
 
Dries committed
598 599
}

Kjartan's avatar
Kjartan committed
600
/**
Dries's avatar
 
Dries committed
601
 * @defgroup validation Input validation
Dries's avatar
 
Dries committed
602
 * @{
Dries's avatar
 
Dries committed
603
 * Functions to validate user input.
Kjartan's avatar
Kjartan committed
604 605
 */

606
/**
Dries's avatar
 
Dries committed
607 608 609
 * Verify the syntax of the given e-mail address.
 *
 * Empty e-mail addresses are allowed. See RFC 2822 for details.
610
 *
Dries's avatar
 
Dries committed
611
 * @param $mail
612
 *   A string containing an e-mail address.
Dries's avatar
 
Dries committed
613
 * @return
Dries's avatar
 
Dries committed
614
 *   TRUE if the address is in a valid format.
615
 */
Dries's avatar
 
Dries committed
616
function valid_email_address($mail) {
617
  $user = '[a-zA-Z0-9_\-\.\+\^!#\$%&*+\/\=\?\`\|\{\}~\']+';
618
  $domain = '(?:(?:[a-zA-Z0-9]|[a-zA-Z0-9][a-zA-Z0-9\-]*[a-zA-Z0-9])\.?)+';
619 620 621
  $ipv4 = '[0-9]{1,3}(\.[0-9]{1,3}){3}';
  $ipv6 = '[0-9a-fA-F]{1,4}(\:[0-9a-fA-F]{1,4}){7}';

Dries's avatar
Dries committed
622
  return preg_match("/^$user@($domain|(\[($ipv4|$ipv6)\]))$/", $mail);
623 624
}

Dries's avatar
 
Dries committed
625 626 627
/**
 * Verify the syntax of the given URL.
 *
Dries's avatar
 
Dries committed
628
 * @param $url
Dries's avatar
 
Dries committed
629
 *   The URL to verify.
Dries's avatar
 
Dries committed
630
 * @param $absolute
Dries's avatar
 
Dries committed
631
 *   Whether the URL is absolute (beginning with a scheme such as "http:").
Dries's avatar
 
Dries committed
632
 * @return
Dries's avatar
 
Dries committed
633
 *   TRUE if the URL is in a valid format.
Dries's avatar
 
Dries committed
634
 */
Dries's avatar
 
Dries committed
635
function valid_url($url, $absolute = FALSE) {
636
  $allowed_characters = '[a-z0-9\/:_\-_\.\?\$,~=#&%\+]';
637
  if ($absolute) {
638
    return preg_match("/^(http|https|ftp):\/\/". $allowed_characters ."+$/i", $url);
639 640
  }
  else {
641
    return preg_match("/^". $allowed_characters ."+$/i", $url);
642
  }
Dries's avatar
 
Dries committed
643 644
}

Dries's avatar
 
Dries committed
645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664
/**
 * Register an event for the current visitor (hostname/IP) to the flood control mechanism.
 *
 * @param $name
 *   The name of the event.
 */
function flood_register_event($name) {
  db_query("INSERT INTO {flood} (event, hostname, timestamp) VALUES ('%s', '%s', %d)", $name, $_SERVER['REMOTE_ADDR'], time());
}

/**
 * Check if the current visitor (hostname/IP) is allowed to proceed with the specified event.
 * The user is allowed to proceed if he did not trigger the specified event more than
 * $threshold times per hour.
 *
 * @param $name
 *   The name of the event.
 * @param $number
 *   The maximum number of the specified event per hour (per visitor).
 * @return
665
 *   True if the user did not exceed the hourly threshold. False otherwise.
Dries's avatar
 
Dries committed
666 667 668 669 670 671
 */
function flood_is_allowed($name, $threshold) {
  $number = db_num_rows(db_query("SELECT event FROM {flood} WHERE event = '%s' AND hostname = '%s' AND timestamp > %d", $name, $_SERVER['REMOTE_ADDR'], time() - 3600));
  return ($number < $threshold ? TRUE : FALSE);
}

672 673
function check_file($filename) {
  return is_uploaded_file($filename);
Dries's avatar
 
Dries committed
674 675
}

Dries's avatar
Dries committed
676 677 678 679 680
/**
 * Prepare a URL for use in an HTML attribute. Strips harmful protocols.
 *
 */
function check_url($uri) {
681
  return filter_xss_bad_protocol($uri, FALSE);
Dries's avatar
Dries committed
682 683
}

Dries's avatar
 
Dries committed
684
/**
Dries's avatar
 
Dries committed
685
 * @defgroup format Formatting
Dries's avatar
 
Dries committed
686
 * @{
Dries's avatar
 
Dries committed
687
 * Functions to format numbers, strings, dates, etc.
Dries's avatar
 
Dries committed
688 689
 */

Dries's avatar
 
Dries committed
690 691 692 693 694 695
/**
 * Formats an RSS channel.
 *
 * Arbitrary elements may be added using the $args associative array.
 */
function format_rss_channel($title, $link, $description, $items, $language = 'en', $args = array()) {
Dries's avatar
 
Dries committed
696 697
  // arbitrary elements may be added using the $args associative array

Dries's avatar
Dries committed
698
  $output = "<channel>\n";
699 700
  $output .= ' <title>'. check_plain($title) ."</title>\n";
  $output .= ' <link>'. check_url($link) ."</link>\n";
701 702 703 704 705

  // The RSS 2.0 "spec" doesn't indicate HTML can be used in the description.
  // We strip all HTML tags, but need to prevent double encoding from properly
  // escaped source data (such as &amp becoming &amp;amp;).
  $output .= ' <description>'. check_plain(decode_entities(strip_tags($description))) ."</description>\n";
706
  $output .= ' <language>'. check_plain($language) ."</language>\n";
707
  $output .= format_xml_elements($args);
Dries's avatar
 
Dries committed
708 709 710 711 712 713
  $output .= $items;
  $output .= "</channel>\n";

  return $output;
}

Dries's avatar
 
Dries committed
714 715 716 717 718
/**
 * Format a single RSS item.
 *
 * Arbitrary elements may be added using the $args associative array.
 */
Dries's avatar
 
Dries committed
719
function format_rss_item($title, $link, $description, $args = array()) {
Dries's avatar
Dries committed
720
  $output = "<item>\n";
721 722 723
  $output .= ' <title>'. check_plain($title) ."</title>\n";
  $output .= ' <link>'. check_url($link) ."</link>\n";
  $output .= ' <description>'. check_plain($description) ."</description>\n";
724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746
  $output .= format_xml_elements($args);
  $output .= "</item>\n";

  return $output;
}

/**
 * Format XML elements.
 *
 * @param $array
 *   An array where each item represent an element and is either a:
 *   - (key => value) pair (<key>value</key>)
 *   - Associative array with fields:
 *     - 'key': element name
 *     - 'value': element contents
 *     - 'attributes': associative array of element attributes
 *
 * In both cases, 'value' can be a simple string, or it can be another array
 * with the same format as $array itself for nesting.
 */
function format_xml_elements($array) {
  foreach ($array as $key => $value) {
    if (is_numeric($key)) {
Dries's avatar
 
Dries committed
747 748
      if ($value['key']) {
        $output .= ' <'. $value['key'];
749
        if (isset($value['attributes']) && is_array($value['attributes'])) {
Dries's avatar
 
Dries committed
750 751 752
          $output .= drupal_attributes($value['attributes']);
        }

753 754
        if ($value['value'] != '') {
          $output .= '>'. (is_array($value['value']) ? format_xml_tags($value['value']) : check_plain($value['value'])) .'</'. $value['key'] .">\n";
Dries's avatar
 
Dries committed
755 756 757 758 759 760 761
        }
        else {
          $output .= " />\n";
        }
      }
    }
    else {
762
      $output .= ' <'. $key .'>'. (is_array($value) ? format_xml_tags($value) : check_plain($value)) ."</$key>\n";
Dries's avatar
 
Dries committed
763
    }
Dries's avatar
 
Dries committed
764
  }
Dries's avatar
 
Dries committed
765 766 767
  return $output;
}

Dries's avatar
 
Dries committed
768
/**
Dries's avatar
 
Dries committed
769
 * Format a string containing a count of items.
Dries's avatar
 
Dries committed
770
 *
Dries's avatar
 
Dries committed
771 772 773 774 775 776 777 778 779 780 781 782 783 784
 * This function ensures that the string is pluralized correctly. Since t() is
 * called by this function, make sure not to pass already-localized strings to it.
 *
 * @param $count
 *   The item count to display.
 * @param $singular
 *   The string for the singular case. Please make sure it is clear this is
 *   singular, to ease translation (e.g. use "1 new comment" instead of "1 new").
 * @param $plural
 *   The string for the plural case. Please make sure it is clear this is plural,
 *   to ease translation. Use %count in place of the item count, as in "%count
 *   new comments".
 * @return
 *   A translated string.
Dries's avatar
 
Dries committed
785
 */
Dries's avatar
 
Dries committed
786
function format_plural($count, $singular, $plural) {
787
  if ($count == 1) return t($singular, array("%count" => $count));
Dries's avatar
 
Dries committed
788 789

  // get the plural index through the gettext formula
790
  $index = (function_exists('locale_get_plural')) ? locale_get_plural($count) : -1;
Dries's avatar
 
Dries committed
791 792 793 794 795 796
  if ($index < 0) { // backward compatibility
    return t($plural, array("%count" => $count));
  }
  else {
    switch ($index) {
      case "0":
797
        return t($singular, array("%count" => $count));
Dries's avatar
 
Dries committed
798 799 800 801 802 803
      case "1":
        return t($plural, array("%count" => $count));
      default:
        return t(strtr($plural, array("%count" => '%count['. $index .']')), array('%count['. $index .']' => $count));
    }
  }
Dries's avatar
 
Dries committed
804 805
}

Dries's avatar
 
Dries committed
806
/**
Dries's avatar
 
Dries committed
807
 * Generate a string representation for the given byte count.
Dries's avatar
 
Dries committed
808
 *
Dries's avatar
 
Dries committed
809 810 811 812
 * @param $size
 *   The size in bytes.
 * @return
 *   A translated string representation of the size.
Dries's avatar
 
Dries committed
813
 */
Dries's avatar
 
Dries committed
814
function format_size($size) {
Dries's avatar
 
Dries committed
815
  $suffix = t('bytes');
816
  if ($size >= 1024) {
Dries's avatar
 
Dries committed
817
    $size = round($size / 1024, 2);
Dries's avatar
 
Dries committed
818
    $suffix = t('KB');
Dries's avatar
 
Dries committed
819
  }
820
  if ($size >= 1024) {
Dries's avatar
 
Dries committed
821
    $size = round($size / 1024, 2);
Dries's avatar
 
Dries committed
822
    $suffix = t('MB');
Dries's avatar
 
Dries committed
823
  }
Dries's avatar
 
Dries committed
824
  return t('%size %suffix', array('%size' => $size, '%suffix' => $suffix));
Dries's avatar
 
Dries committed
825 826
}

Dries's avatar
 
Dries committed
827
/**
Dries's avatar
 
Dries committed
828
 * Format a time interval with the requested granularity.
Dries's avatar
 
Dries committed
829
 *
Dries's avatar
 
Dries committed
830 831 832 833 834 835
 * @param $timestamp
 *   The length of the interval in seconds.
 * @param $granularity
 *   How many different units to display in the string.
 * @return
 *   A translated string representation of the interval.
Dries's avatar
 
Dries committed
836
 */
Dries's avatar
 
Dries committed
837
function format_interval($timestamp, $granularity = 2) {
Dries's avatar
 
Dries committed
838
  $units = array('1 year|%count years' => 31536000, '1 week|%count weeks' => 604800, '1 day|%count days' => 86400, '1 hour|%count hours' => 3600, '1 min|%count min' => 60, '1 sec|%count sec' => 1);
Dries's avatar
 
Dries committed
839
  $output = '';
Dries's avatar
 
Dries committed
840
  foreach ($units as $key => $value) {
Dries's avatar
 
Dries committed
841
    $key = explode('|', $key);
Dries's avatar
 
Dries committed
842
    if ($timestamp >= $value) {
Dries's avatar
 
Dries committed
843
      $output .= ($output ? ' ' : '') . format_plural(floor($timestamp / $value), $key[0], $key[1]);
Dries's avatar
 
Dries committed
844
      $timestamp %= $value;
Dries's avatar
 
Dries committed
845 846 847 848 849
      $granularity--;
    }

    if ($granularity == 0) {
      break;
Dries's avatar
 
Dries committed
850 851
    }
  }
Dries's avatar
 
Dries committed
852
  return $output ? $output : t('0 sec');
Dries's avatar
 
Dries committed
853 854
}

Dries's avatar
 
Dries committed
855
/**
Dries's avatar
 
Dries committed
856 857
 * Format a date with the given configured format or a custom format string.
 *
Dries's avatar
 
Dries committed
858 859 860 861
 * Drupal allows administrators to select formatting strings for 'small',
 * 'medium' and 'large' date formats. This function can handle these formats,
 * as well as any custom format.
 *
Dries's avatar
 
Dries committed
862 863 864 865 866 867
 * @param $timestamp
 *   The exact date to format, as a UNIX timestamp.
 * @param $type
 *   The format to use. Can be "small", "medium" or "large" for the preconfigured
 *   date formats. If "custom" is specified, then $format is required as well.
 * @param $format
868 869 870
 *   A PHP date format string as required by date(). A backslash should be used
 *   before a character to avoid interpreting the character as part of a date
 *   format.
Dries's avatar
 
Dries committed
871 872 873 874
 * @param $timezone
 *   Time zone offset in seconds; if omitted, the user's time zone is used.
 * @return
 *   A translated date string in the requested format.
Dries's avatar
 
Dries committed
875
 */
876
function format_date($timestamp, $type = 'medium', $format = '', $timezone = NULL) {
877
  if (!isset($timezone)) {
878
    global $user;
Steven Wittens's avatar
Steven Wittens committed
879 880 881 882 883 884
    if (variable_get('configurable_timezones', 1) && $user->uid && strlen($user->timezone)) {
      $timezone = $user->timezone;
    }
    else {
      $timezone = variable_get('date_default_timezone', 0);
    }
885
  }
Dries's avatar
 
Dries committed
886

887
  $timestamp += $timezone;
Dries's avatar
 
Dries committed
888 889

  switch ($type) {
890 891
    case 'small':
      $format = variable_get('date_format_short', 'm/d/Y - H:i');
Dries's avatar
 
Dries committed
892
      break;
893 894
    case 'large':
      $format = variable_get('date_format_long', 'l, F j, Y - H:i');
Dries's avatar
 
Dries committed
895
      break;
896
    case 'custom':
Dries's avatar
 
Dries committed
897
      // No change to format
Dries's avatar
 
Dries committed
898
      break;
899
    case 'medium':
Dries's avatar
 
Dries committed
900
    default:
901
      $format = variable_get('date_format_medium', 'D, m/d/Y - H:i');
Dries's avatar
 
Dries committed
902 903
  }

904
  $max = strlen($format);
Dries's avatar
 
Dries committed
905
  $date = '';
Dries's avatar
 
Dries committed
906
  for ($i = 0; $i < $max; $i++) {
907
    $c = $format[$i];
908
    if (strpos('AaDFlM', $c) !== FALSE) {
909
      $date .= t(gmdate($c, $timestamp));
910
    }
911
    else if (strpos('BdgGhHiIjLmnsStTUwWYyz', $c) !== FALSE) {
912 913 914 915
      $date .= gmdate($c, $timestamp);
    }
    else if ($c == 'r') {
      $date .= format_date($timestamp - $timezone, 'custom', 'D, d M Y H:i:s O', $timezone);
Dries's avatar
 
Dries committed
916
    }
917 918 919 920 921
    else if ($c == 'O') {
      $date .= sprintf('%s%02d%02d', ($timezone < 0 ? '-' : '+'), abs($timezone / 3600), abs($timezone % 3600) / 60);
    }
    else if ($c == 'Z') {
      $date .= $timezone;
Dries's avatar
 
Dries committed
922
    }
923 924 925
    else if ($c == '\\') {
      $date .= $format[++$i];
    }
Dries's avatar
 
Dries committed
926
    else {
927
      $date .= $c;
Dries's avatar
 
Dries committed
928
    }
Dries's avatar
 
Dries committed
929
  }
930

Dries's avatar
 
Dries committed
931 932 933
  return $date;
}

Dries's avatar
 
Dries committed
934 935 936
/**
 * @} End of "defgroup format".
 */
Dries's avatar
 
Dries committed
937

Dries's avatar
 
Dries committed
938
/**
939
 * Generate a URL from a Drupal menu path. Will also pass-through existing URLs.
Dries's avatar
 
Dries committed
940 941
 *
 * @param $path
942
 *   The Drupal path being linked to, such as "admin/content/node", or an existing URL