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<?php
/**
* @file
* Functions that need to be loaded on every Drupal request.
*/
/**
* Indicates that the item should never be removed unless explicitly told to
* using cache_clear_all() with a cache ID.
*/
define('CACHE_PERMANENT', 0);
/**
* Indicates that the item should be removed at the next general cache wipe.
*/
define('CACHE_TEMPORARY', -1);
/**
* Indicates that page caching is disabled.
*/
define('CACHE_DISABLED', 0);
/**
* Indicates that page caching is enabled, using "normal" mode.
*/
define('CACHE_NORMAL', 1);
/**
* Indicates that page caching is using "aggressive" mode. This bypasses
* loading any modules for additional speed, which may break functionality in
* modules that expect to be run on each page load.
*/
define('CACHE_AGGRESSIVE', 2);
/**
* Log message severity -- Emergency: system is unusable.
*
* The WATCHDOG_* constant definitions correspond to the logging severity levels
* defined in RFC 3164, section 4.1.1: http://www.faqs.org/rfcs/rfc3164.html
*
* @see watchdog()
* @see watchdog_severity_levels()
*/
define('WATCHDOG_EMERG', 0);
/**
* Log message severity -- Alert: action must be taken immediately.
*
* The WATCHDOG_* constant definitions correspond to the logging severity levels
* defined in RFC 3164, section 4.1.1: http://www.faqs.org/rfcs/rfc3164.html
*
* @see watchdog()
* @see watchdog_severity_levels()
*/
define('WATCHDOG_ALERT', 1);
/**
* Log message severity -- Critical: critical conditions.
*
* The WATCHDOG_* constant definitions correspond to the logging severity levels
* defined in RFC 3164, section 4.1.1: http://www.faqs.org/rfcs/rfc3164.html
*
* @see watchdog()
* @see watchdog_severity_levels()
*/
define('WATCHDOG_CRITICAL', 2);
/**
* Log message severity -- Error: error conditions.
*
* The WATCHDOG_* constant definitions correspond to the logging severity levels
* defined in RFC 3164, section 4.1.1: http://www.faqs.org/rfcs/rfc3164.html
*
* @see watchdog()
* @see watchdog_severity_levels()
*/
define('WATCHDOG_ERROR', 3);
/**
* Log message severity -- Warning: warning conditions.
*
* The WATCHDOG_* constant definitions correspond to the logging severity levels
* defined in RFC 3164, section 4.1.1: http://www.faqs.org/rfcs/rfc3164.html
*
* @see watchdog()
* @see watchdog_severity_levels()
*/
define('WATCHDOG_WARNING', 4);
/**
* Log message severity -- Notice: normal but significant condition.
*
* The WATCHDOG_* constant definitions correspond to the logging severity levels
* defined in RFC 3164, section 4.1.1: http://www.faqs.org/rfcs/rfc3164.html
*
* @see watchdog()
* @see watchdog_severity_levels()
*/
define('WATCHDOG_NOTICE', 5);
/**
* Log message severity -- Informational: informational messages.
*
* The WATCHDOG_* constant definitions correspond to the logging severity levels
* defined in RFC 3164, section 4.1.1: http://www.faqs.org/rfcs/rfc3164.html
*
* @see watchdog()
* @see watchdog_severity_levels()
*/
define('WATCHDOG_INFO', 6);
/**
* Log message severity -- Debug: debug-level messages.
*
* The WATCHDOG_* constant definitions correspond to the logging severity levels
* defined in RFC 3164, section 4.1.1: http://www.faqs.org/rfcs/rfc3164.html
*
* @see watchdog()
* @see watchdog_severity_levels()
*/
define('WATCHDOG_DEBUG', 7);
/**
* First bootstrap phase: initialize configuration.
*/
define('DRUPAL_BOOTSTRAP_CONFIGURATION', 0);
/**
* Second bootstrap phase: try to call a non-database cache
* fetch routine.
*/
define('DRUPAL_BOOTSTRAP_EARLY_PAGE_CACHE', 1);
/**
* Third bootstrap phase: initialize database layer.
*/
define('DRUPAL_BOOTSTRAP_DATABASE', 2);
/**
* Fourth bootstrap phase: identify and reject banned hosts.
*/
define('DRUPAL_BOOTSTRAP_ACCESS', 3);
/**
* Fifth bootstrap phase: initialize session handling.
*/
define('DRUPAL_BOOTSTRAP_SESSION', 4);
/**
* Sixth bootstrap phase: load bootstrap.inc and module.inc, start
* the variable system and try to serve a page from the cache.
*/
define('DRUPAL_BOOTSTRAP_LATE_PAGE_CACHE', 5);
/**
* Seventh bootstrap phase: find out language of the page.
*/
define('DRUPAL_BOOTSTRAP_LANGUAGE', 6);
/**
* Eighth bootstrap phase: set $_GET['q'] to Drupal path of request.
*/
define('DRUPAL_BOOTSTRAP_PATH', 7);
/**
* Final bootstrap phase: Drupal is fully loaded; validate and fix
* input data.
*/
define('DRUPAL_BOOTSTRAP_FULL', 8);
/**
* Role ID for anonymous users; should match what's in the "role" table.
*/
define('DRUPAL_ANONYMOUS_RID', 1);
/**
* Role ID for authenticated users; should match what's in the "role" table.
*/
define('DRUPAL_AUTHENTICATED_RID', 2);
/**
* No language negotiation. The default language is used.
*/
define('LANGUAGE_NEGOTIATION_NONE', 0);
/**
* Path based negotiation with fallback to default language
* if no defined path prefix identified.
*/
define('LANGUAGE_NEGOTIATION_PATH_DEFAULT', 1);
/**
* Path based negotiation with fallback to user preferences
* and browser language detection if no defined path prefix
* identified.
*/
define('LANGUAGE_NEGOTIATION_PATH', 2);
/**
* Domain based negotiation with fallback to default language
* if no language identified by domain.
*/
define('LANGUAGE_NEGOTIATION_DOMAIN', 3);
/**
* Language written left to right. Possible value of $language->direction.
*/
define('LANGUAGE_LTR', 0);
/**
* Language written right to left. Possible value of $language->direction.
*/
define('LANGUAGE_RTL', 1);
// Hide E_DEPRECATED messages.
if (defined('E_DEPRECATED')) {
error_reporting(error_reporting() & ~E_DEPRECATED);
}
/**
* Start the timer with the specified name. If you start and stop
* the same timer multiple times, the measured intervals will be
* accumulated.
*
* @param name
* The name of the timer.
*/
function timer_start($name) {
global $timers;
list($usec, $sec) = explode(' ', microtime());
$timers[$name]['start'] = (float)$usec + (float)$sec;
$timers[$name]['count'] = isset($timers[$name]['count']) ? ++$timers[$name]['count'] : 1;
}
/**
* Read the current timer value without stopping the timer.
*
* @param name
* The name of the timer.
* @return
* The current timer value in ms.
*/
function timer_read($name) {
global $timers;
if (isset($timers[$name]['start'])) {
list($usec, $sec) = explode(' ', microtime());
$stop = (float)$usec + (float)$sec;
$diff = round(($stop - $timers[$name]['start']) * 1000, 2);
if (isset($timers[$name]['time'])) {
$diff += $timers[$name]['time'];
}
return $diff;
}
}
/**
* Stop the timer with the specified name.
*
* @param name
* The name of the timer.
* @return
* A timer array. The array contains the number of times the
* timer has been started and stopped (count) and the accumulated
* timer value in ms (time).
*/
function timer_stop($name) {
global $timers;
$timers[$name]['time'] = timer_read($name);
unset($timers[$name]['start']);
return $timers[$name];
}
/**
* Find the appropriate configuration directory.
*
* Try finding a matching configuration directory by stripping the website's
* hostname from left to right and pathname from right to left. The first
* configuration file found will be used; the remaining will ignored. If no
* configuration file is found, return a default value '$confdir/default'.
*
* Example for a fictitious site installed at
* http://www.drupal.org:8080/mysite/test/ the 'settings.php' is searched in
* the following directories:
*
* 1. $confdir/8080.www.drupal.org.mysite.test
* 2. $confdir/www.drupal.org.mysite.test
* 3. $confdir/drupal.org.mysite.test
* 4. $confdir/org.mysite.test
*
* 5. $confdir/8080.www.drupal.org.mysite
* 6. $confdir/www.drupal.org.mysite
* 7. $confdir/drupal.org.mysite
* 8. $confdir/org.mysite
*
* 9. $confdir/8080.www.drupal.org
* 10. $confdir/www.drupal.org
* 11. $confdir/drupal.org
* 12. $confdir/org
*
* 13. $confdir/default
*
* @param $require_settings
* Only configuration directories with an existing settings.php file
* will be recognized. Defaults to TRUE. During initial installation,
* this is set to FALSE so that Drupal can detect a matching directory,
* then create a new settings.php file in it.
* @param reset
* Force a full search for matching directories even if one had been
* found previously.
* @return
* The path of the matching directory.
*/
function conf_path($require_settings = TRUE, $reset = FALSE) {
static $conf = '';
if ($conf && !$reset) {
return $conf;
}
$confdir = 'sites';
$uri = explode('/', $_SERVER['SCRIPT_NAME'] ? $_SERVER['SCRIPT_NAME'] : $_SERVER['SCRIPT_FILENAME']);
$server = explode('.', implode('.', array_reverse(explode(':', rtrim($_SERVER['HTTP_HOST'], '.')))));
for ($i = count($uri) - 1; $i > 0; $i--) {
for ($j = count($server); $j > 0; $j--) {
$dir = implode('.', array_slice($server, -$j)) . implode('.', array_slice($uri, 0, $i));
if (file_exists("$confdir/$dir/settings.php") || (!$require_settings && file_exists("$confdir/$dir"))) {
$conf = "$confdir/$dir";
return $conf;
}
}
}
$conf = "$confdir/default";
return $conf;
}
/**
* Unsets all disallowed global variables. See $allowed for what's allowed.
*/
function drupal_unset_globals() {
if (ini_get('register_globals')) {
$allowed = array('_ENV' => 1, '_GET' => 1, '_POST' => 1, '_COOKIE' => 1, '_FILES' => 1, '_SERVER' => 1, '_REQUEST' => 1, 'GLOBALS' => 1);
foreach ($GLOBALS as $key => $value) {
if (!isset($allowed[$key])) {
unset($GLOBALS[$key]);
}
}
}
}
/**
* Validate that a hostname (for example $_SERVER['HTTP_HOST']) is safe.
*
* As $_SERVER['HTTP_HOST'] is user input, ensure it only contains characters
* allowed in hostnames. See RFC 952 (and RFC 2181). $_SERVER['HTTP_HOST'] is
* lowercased.
*
* @return
* TRUE if only containing valid characters, or FALSE otherwise.
*/
function drupal_valid_http_host($host) {
return preg_match('/^\[?(?:[a-z0-9-:\]_]+\.?)+$/', $host);
}
/**
* Loads the configuration and sets the base URL, cookie domain, and
* session name correctly.
*/
function conf_init() {
global $base_url, $base_path, $base_root;
// Export the following settings.php variables to the global namespace
global $db_url, $db_prefix, $db_collation, $cookie_domain, $conf, $installed_profile, $update_free_access;
$conf = array();
if (isset($_SERVER['HTTP_HOST'])) {
// As HTTP_HOST is user input, ensure it only contains characters allowed
// in hostnames. See RFC 952 (and RFC 2181).
// $_SERVER['HTTP_HOST'] is lowercased here per specifications.
$_SERVER['HTTP_HOST'] = strtolower($_SERVER['HTTP_HOST']);
if (!drupal_valid_http_host($_SERVER['HTTP_HOST'])) {
// HTTP_HOST is invalid, e.g. if containing slashes it may be an attack.
header('HTTP/1.1 400 Bad Request');
exit;
}
}
else {
// Some pre-HTTP/1.1 clients will not send a Host header. Ensure the key is
// defined for E_ALL compliance.
$_SERVER['HTTP_HOST'] = '';
}
if (file_exists('./'. conf_path() .'/settings.php')) {
include_once './'. conf_path() .'/settings.php';
}
// Ignore the placeholder url from default.settings.php.
if (isset($db_url) && $db_url == 'mysql://username:password@localhost/databasename') {
$db_url = '';
}
if (isset($base_url)) {
// Parse fixed base URL from settings.php.
$parts = parse_url($base_url);
if (!isset($parts['path'])) {
$parts['path'] = '';
}
$base_path = $parts['path'] .'/';
// Build $base_root (everything until first slash after "scheme://").
$base_root = substr($base_url, 0, strlen($base_url) - strlen($parts['path']));
}
else {
// Create base URL
$base_root = (isset($_SERVER['HTTPS']) && $_SERVER['HTTPS'] == 'on') ? 'https' : 'http';
$base_url = $base_root .= '://'. $_SERVER['HTTP_HOST'];
// $_SERVER['SCRIPT_NAME'] can, in contrast to $_SERVER['PHP_SELF'], not
// be modified by a visitor.
if ($dir = trim(dirname($_SERVER['SCRIPT_NAME']), '\,/')) {
$base_path = "/$dir";
$base_url .= $base_path;
$base_path .= '/';
}
else {
$base_path = '/';
}
}
if ($cookie_domain) {
// If the user specifies the cookie domain, also use it for session name.
$session_name = $cookie_domain;
}
else {
// Otherwise use $base_url as session name, without the protocol
// to use the same session identifiers across http and https.
list( , $session_name) = explode('://', $base_url, 2);
// We escape the hostname because it can be modified by a visitor.
if (!empty($_SERVER['HTTP_HOST'])) {
$cookie_domain = check_plain($_SERVER['HTTP_HOST']);
// Strip leading periods, www., and port numbers from cookie domain.
$cookie_domain = ltrim($cookie_domain, '.');
if (strpos($cookie_domain, 'www.') === 0) {
$cookie_domain = substr($cookie_domain, 4);
}
$cookie_domain = explode(':', $cookie_domain);
$cookie_domain = '.'. $cookie_domain[0];
}
}
// To prevent session cookies from being hijacked, a user can configure the
// SSL version of their website to only transfer session cookies via SSL by
// using PHP's session.cookie_secure setting. The browser will then use two
// separate session cookies for the HTTPS and HTTP versions of the site. So we
// must use different session identifiers for HTTPS and HTTP to prevent a
// cookie collision.
if (ini_get('session.cookie_secure')) {
$session_name .= 'SSL';
}
// Per RFC 2109, cookie domains must contain at least one dot other than the
// first. For hosts such as 'localhost' or IP Addresses we don't set a cookie domain.
if (count(explode('.', $cookie_domain)) > 2 && !is_numeric(str_replace('.', '', $cookie_domain))) {
ini_set('session.cookie_domain', $cookie_domain);
}
session_name('SESS'. md5($session_name));
}
/**
* Returns and optionally sets the filename for a system item (module,
* theme, etc.). The filename, whether provided, cached, or retrieved
* from the database, is only returned if the file exists.
*
* This function plays a key role in allowing Drupal's resources (modules
* and themes) to be located in different places depending on a site's
* configuration. For example, a module 'foo' may legally be be located
* in any of these three places:
*
* modules/foo/foo.module
* sites/all/modules/foo/foo.module
* sites/example.com/modules/foo/foo.module
*
* Calling drupal_get_filename('module', 'foo') will give you one of
* the above, depending on where the module is located.
*
* @param $type
* The type of the item (i.e. theme, theme_engine, module, profile).
* @param $name
* The name of the item for which the filename is requested.
* @param $filename
* The filename of the item if it is to be set explicitly rather
* than by consulting the database.
*
* @return
* The filename of the requested item.
*/
function drupal_get_filename($type, $name, $filename = NULL) {
static $files = array();
if (!isset($files[$type])) {
$files[$type] = array();
}
if (!empty($filename) && file_exists($filename)) {
$files[$type][$name] = $filename;
}
elseif (isset($files[$type][$name])) {
// nothing
}
// Verify that we have an active database connection, before querying
// the database. This is required because this function is called both
// before we have a database connection (i.e. during installation) and
// when a database connection fails.
elseif (db_is_active() && (($file = db_result(db_query("SELECT filename FROM {system} WHERE name = '%s' AND type = '%s'", $name, $type))) && file_exists($file))) {
$files[$type][$name] = $file;
}
else {
// Fallback to searching the filesystem if the database connection is
// not established or the requested file is not found.
$config = conf_path();
$dir = (($type == 'theme_engine') ? 'themes/engines' : "${type}s");
$file = (($type == 'theme_engine') ? "$name.engine" : "$name.$type");
foreach (array("$config/$dir/$file", "$config/$dir/$name/$file", "$dir/$file", "$dir/$name/$file") as $file) {
if (file_exists($file)) {
$files[$type][$name] = $file;
break;
}
}
}
if (isset($files[$type][$name])) {
return $files[$type][$name];
}
}
/**
* Load the persistent variable table.
*
* The variable table is composed of values that have been saved in the table
* with variable_set() as well as those explicitly specified in the configuration
* file.
*/
function variable_init($conf = array()) {
// NOTE: caching the variables improves performance by 20% when serving cached pages.
if ($cached = cache_get('variables', 'cache')) {
$variables = $cached->data;
}
else {
$result = db_query('SELECT * FROM {variable}');
while ($variable = db_fetch_object($result)) {
$variables[$variable->name] = unserialize($variable->value);
}
cache_set('variables', $variables);
}
foreach ($conf as $name => $value) {
$variables[$name] = $value;
}
return $variables;
}
/**
* Returns a persistent variable.
*
* Case-sensitivity of the variable_* functions depends on the database
* collation used. To avoid problems, always use lower case for persistent
* variable names.
*
* @param $name
* The name of the variable to return.
* @param $default
* The default value to use if this variable has never been set.
* @return
* The value of the variable.
*
* @see variable_del(), variable_set()
*/
function variable_get($name, $default) {
global $conf;
return isset($conf[$name]) ? $conf[$name] : $default;
}
/**
* Sets a persistent variable.
*
* Case-sensitivity of the variable_* functions depends on the database
* collation used. To avoid problems, always use lower case for persistent
* variable names.
*
* @param $name
* The name of the variable to set.
* @param $value
* The value to set. This can be any PHP data type; these functions take care
* of serialization as necessary.
*
* @see variable_del(), variable_get()
*/
function variable_set($name, $value) {
global $conf;
$serialized_value = serialize($value);
db_query("UPDATE {variable} SET value = '%s' WHERE name = '%s'", $serialized_value, $name);
if (!db_affected_rows()) {
@db_query("INSERT INTO {variable} (name, value) VALUES ('%s', '%s')", $name, $serialized_value);
}
cache_clear_all('variables', 'cache');
$conf[$name] = $value;
}
/**
* Unsets a persistent variable.
*
* Case-sensitivity of the variable_* functions depends on the database
* collation used. To avoid problems, always use lower case for persistent
* variable names.
*
* @param $name
* The name of the variable to undefine.
*
* @see variable_get(), variable_set()
*/
function variable_del($name) {
global $conf;
db_query("DELETE FROM {variable} WHERE name = '%s'", $name);
cache_clear_all('variables', 'cache');
unset($conf[$name]);
}
/**
* Retrieve the current page from the cache.
*
* Note: we do not serve cached pages when status messages are waiting (from
* a redirected form submission which was completed).
*
* @param $status_only
* When set to TRUE, retrieve the status of the page cache only
* (whether it was started in this request or not).
*/
function page_get_cache($status_only = FALSE) {
static $status = FALSE;
global $user, $base_root;
if ($status_only) {
return $status;
}
$cache = NULL;
if (!$user->uid && $_SERVER['REQUEST_METHOD'] == 'GET' && count(drupal_set_message()) == 0 && $_SERVER['SERVER_SOFTWARE'] !== 'PHP CLI') {
$cache = cache_get($base_root . request_uri(), 'cache_page');
if (empty($cache)) {
ob_start();
$status = TRUE;
}
}
return $cache;
}
/**
* Call all init or exit hooks without including all modules.
*
* @param $hook
* The name of the bootstrap hook we wish to invoke.
*/
function bootstrap_invoke_all($hook) {
foreach (module_list(TRUE, TRUE) as $module) {
drupal_load('module', $module);
module_invoke($module, $hook);
}
}
/**
* Includes a file with the provided type and name. This prevents
* including a theme, engine, module, etc., more than once.
*
* @param $type
* The type of item to load (i.e. theme, theme_engine, module, profile).
* @param $name
* The name of the item to load.
*
* @return
* TRUE if the item is loaded or has already been loaded.
*/
function drupal_load($type, $name) {
static $files = array();
if (isset($files[$type][$name])) {
return TRUE;
}
$filename = drupal_get_filename($type, $name);
if ($filename) {
include_once "./$filename";
$files[$type][$name] = TRUE;
return TRUE;
}
return FALSE;
}
/**
* Set HTTP headers in preparation for a page response.
*
* Authenticated users are always given a 'no-cache' header, and will
* fetch a fresh page on every request. This prevents authenticated
* users seeing locally cached pages that show them as logged out.
*
* @see page_set_cache()
*/
function drupal_page_header() {
header("Expires: Sun, 19 Nov 1978 05:00:00 GMT");
header("Last-Modified: ". gmdate("D, d M Y H:i:s") ." GMT");
header("Cache-Control: store, no-cache, must-revalidate");
header("Cache-Control: post-check=0, pre-check=0", FALSE);
}
/**
* Set HTTP headers in preparation for a cached page response.
*
* The general approach here is that anonymous users can keep a local
* cache of the page, but must revalidate it on every request. Then,
* they are given a '304 Not Modified' response as long as they stay
* logged out and the page has not been modified.
*
*/
function drupal_page_cache_header($cache) {
// Set default values:
$last_modified = gmdate('D, d M Y H:i:s', $cache->created) .' GMT';
$etag = '"'. md5($last_modified) .'"';
// See if the client has provided the required HTTP headers:
$if_modified_since = isset($_SERVER['HTTP_IF_MODIFIED_SINCE']) ? stripslashes($_SERVER['HTTP_IF_MODIFIED_SINCE']) : FALSE;
$if_none_match = isset($_SERVER['HTTP_IF_NONE_MATCH']) ? stripslashes($_SERVER['HTTP_IF_NONE_MATCH']) : FALSE;
if ($if_modified_since && $if_none_match
&& $if_none_match == $etag // etag must match
&& $if_modified_since == $last_modified) { // if-modified-since must match
header('HTTP/1.1 304 Not Modified');
// All 304 responses must send an etag if the 200 response for the same object contained an etag
header("Etag: $etag");
return;
}
// Send appropriate response:
header("Last-Modified: $last_modified");
header("ETag: $etag");
// The following headers force validation of cache:
header("Expires: Sun, 19 Nov 1978 05:00:00 GMT");
header("Cache-Control: must-revalidate");
if (variable_get('page_compression', TRUE) && extension_loaded('zlib')) {
// Determine if the browser accepts gzipped data.
if (isset($_SERVER['HTTP_ACCEPT_ENCODING']) && strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'gzip') !== FALSE) {
// $cache->data is already gzip'ed, so make sure zlib.output_compression
// does not compress it once more.
ini_set('zlib.output_compression', '0');
header('Content-Encoding: gzip');
}
else {
// The client does not support compression, so unzip the data in the
// cache. Strip the gzip header and run uncompress.
$cache->data = gzinflate(substr(substr($cache->data, 10), 0, -8));
}
}
// Send the original request's headers. We send them one after
// another so PHP's header() function can deal with duplicate
// headers.
$headers = explode("\n", $cache->headers);
foreach ($headers as $header) {
header($header);
}
print $cache->data;
}
/**
* Define the critical hooks that force modules to always be loaded.
*/
function bootstrap_hooks() {
return array('boot', 'exit');
}
/**
* Unserializes and appends elements from a serialized string.
*
* @param $obj
* The object to which the elements are appended.
* @param $field
* The attribute of $obj whose value should be unserialized.
*/
function drupal_unpack($obj, $field = 'data') {
if ($obj->$field && $data = unserialize($obj->$field)) {
foreach ($data as $key => $value) {
if (!empty($key) && !isset($obj->$key)) {
$obj->$key = $value;
}
}
}
return $obj;
}
/**
* Return the URI of the referring page.
*/
function referer_uri() {
if (isset($_SERVER['HTTP_REFERER'])) {
return $_SERVER['HTTP_REFERER'];
}
}
/**
* Encode special characters in a plain-text string for display as HTML.
*
* Also validates strings as UTF-8 to prevent cross site scripting attacks on
* Internet Explorer 6.
*
* @param $text
* The text to be checked or processed.
* @return
* An HTML safe version of $text, or an empty string if $text is not
* valid UTF-8.
*
* @see drupal_validate_utf8().
*/
function check_plain($text) {
static $php525;
if (!isset($php525)) {
$php525 = version_compare(PHP_VERSION, '5.2.5', '>=');
}
// We duplicate the preg_match() to validate strings as UTF-8 from
// drupal_validate_utf8() here. This avoids the overhead of an additional
// function call, since check_plain() may be called hundreds of times during
// a request. For PHP 5.2.5+, this check for valid UTF-8 should be handled
// internally by PHP in htmlspecialchars().
// @see http://www.php.net/releases/5_2_5.php
// @todo remove this when support for either IE6 or PHP < 5.2.5 is dropped.
if ($php525) {
return htmlspecialchars($text, ENT_QUOTES, 'UTF-8');
}
return (preg_match('/^./us', $text) == 1) ? htmlspecialchars($text, ENT_QUOTES, 'UTF-8') : '';
}
/**
* Checks whether a string is valid UTF-8.
*
* All functions designed to filter input should use drupal_validate_utf8
* to ensure they operate on valid UTF-8 strings to prevent bypass of the
* filter.
*
* When text containing an invalid UTF-8 lead byte (0xC0 - 0xFF) is presented
* as UTF-8 to Internet Explorer 6, the program may misinterpret subsequent
* bytes. When these subsequent bytes are HTML control characters such as
* quotes or angle brackets, parts of the text that were deemed safe by filters
* end up in locations that are potentially unsafe; An onerror attribute that
* is outside of a tag, and thus deemed safe by a filter, can be interpreted
* by the browser as if it were inside the tag.
*
* This function exploits preg_match behaviour (since PHP 4.3.5) when used
* with the u modifier, as a fast way to find invalid UTF-8. When the matched
* string contains an invalid byte sequence, it will fail silently.
*
* preg_match may not fail on 4 and 5 octet sequences, even though they
* are not supported by the specification.
*
* The specific preg_match behaviour is present since PHP 4.3.5.
*
* @param $text
* The text to check.
* @return
* TRUE if the text is valid UTF-8, FALSE if not.
*/
function drupal_validate_utf8($text) {
if (strlen($text) == 0) {
return TRUE;
}
// For performance reasons this logic is duplicated in check_plain().
return (preg_match('/^./us', $text) == 1);
}
/**
* Since $_SERVER['REQUEST_URI'] is only available on Apache, we
* generate an equivalent using other environment variables.
*/
function request_uri() {
if (isset($_SERVER['REQUEST_URI'])) {
$uri = $_SERVER['REQUEST_URI'];
}
else {
if (isset($_SERVER['argv'])) {
$uri = $_SERVER['SCRIPT_NAME'] .'?'. $_SERVER['argv'][0];
}
elseif (isset($_SERVER['QUERY_STRING'])) {
$uri = $_SERVER['SCRIPT_NAME'] .'?'. $_SERVER['QUERY_STRING'];
}
else {
$uri = $_SERVER['SCRIPT_NAME'];
}
}
// Prevent multiple slashes to avoid cross site requests via the FAPI.
$uri = '/'. ltrim($uri, '/');
return $uri;
}
/**
* Log a system message.
*
* @param $type
* The category to which this message belongs. Can be any string, but the
* general practice is to use the name of the module calling watchdog().
* @param $message
* The message to store in the log. See t() for documentation
* on how $message and $variables interact. Keep $message
* translatable by not concatenating dynamic values into it!
* @param $variables
* Array of variables to replace in the message on display or
* NULL if message is already translated or not possible to
* translate.
* @param $severity
* The severity of the message, as per RFC 3164. Possible values are
* WATCHDOG_ERROR, WATCHDOG_WARNING, etc.
* @param $link
* A link to associate with the message.
*
* @see watchdog_severity_levels()
*/
function watchdog($type, $message, $variables = array(), $severity = WATCHDOG_NOTICE, $link = NULL) {
global $user, $base_root;
// Prepare the fields to be logged
$log_message = array(
'type' => $type,
'message' => $message,
'variables' => $variables,
'severity' => $severity,
'link' => $link,
'user' => $user,
'request_uri' => $base_root . request_uri(),
'referer' => referer_uri(),
'ip' => ip_address(),
'timestamp' => time(),
);
// Call the logging hooks to log/process the message
foreach (module_implements('watchdog') as $module) {
module_invoke($module, 'watchdog', $log_message);
}
}
/**
* Set a message which reflects the status of the performed operation.
*
* If the function is called with no arguments, this function returns all set
* messages without clearing them.
*
* @param $message
* The message should begin with a capital letter and always ends with a
* period '.'.
* @param $type
* The type of the message. One of the following values are possible:
* - 'status'
* - 'warning'
* - 'error'
* @param $repeat
* If this is FALSE and the message is already set, then the message won't
* be repeated.
*/
function drupal_set_message($message = NULL, $type = 'status', $repeat = TRUE) {
if ($message) {
if (!isset($_SESSION['messages'])) {
$_SESSION['messages'] = array();
}
if (!isset($_SESSION['messages'][$type])) {
$_SESSION['messages'][$type] = array();
}
if ($repeat || !in_array($message, $_SESSION['messages'][$type])) {
$_SESSION['messages'][$type][] = $message;
}
}
// messages not set when DB connection fails
return isset($_SESSION['messages']) ? $_SESSION['messages'] : NULL;
}
/**
* Return all messages that have been set.
*
* @param $type
* (optional) Only return messages of this type.
* @param $clear_queue
* (optional) Set to FALSE if you do not want to clear the messages queue
* @return
* An associative array, the key is the message type, the value an array
* of messages. If the $type parameter is passed, you get only that type,
* or an empty array if there are no such messages. If $type is not passed,
* all message types are returned, or an empty array if none exist.
*/
function drupal_get_messages($type = NULL, $clear_queue = TRUE) {
if ($messages = drupal_set_message()) {
if ($type) {
if ($clear_queue) {
unset($_SESSION['messages'][$type]);
}
if (isset($messages[$type])) {
return array($type => $messages[$type]);
}
}
else {
if ($clear_queue) {
unset($_SESSION['messages']);
}
return $messages;
}
}
return array();
}
/**
* Perform an access check for a given mask and rule type. Rules are usually
* created via admin/user/rules page.
*
* If any allow rule matches, access is allowed. Otherwise, if any deny rule
* matches, access is denied. If no rule matches, access is allowed.
*
* @param $type string
* Type of access to check: Allowed values are:
* - 'host': host name or IP address
* - 'mail': e-mail address
* - 'user': username
* @param $mask string
* String or mask to test: '_' matches any character, '%' matches any
* number of characters.
* @return bool
* TRUE if access is denied, FALSE if access is allowed.
*/
function drupal_is_denied($type, $mask) {
// Because this function is called for every page request, both cached
// and non-cached pages, we tried to optimize it as much as possible.
// We deny access if the only matching records in the {access} table have
// status 0 (deny). If any have status 1 (allow), or if there are no
// matching records, we allow access.
$sql = "SELECT 1 FROM {access} WHERE type = '%s' AND LOWER('%s') LIKE LOWER(mask) AND status = %d";
return db_result(db_query_range($sql, $type, $mask, 0, 0, 1)) && !db_result(db_query_range($sql, $type, $mask, 1, 0, 1));
}
/**
* Generates a default anonymous $user object.
*
* @return Object - the user object.
*/
function drupal_anonymous_user($session = '') {
$user = new stdClass();
$user->uid = 0;
$user->hostname = ip_address();
$user->roles = array();
$user->roles[DRUPAL_ANONYMOUS_RID] = 'anonymous user';
$user->session = $session;
$user->cache = 0;
return $user;
}
/**
* A string describing a phase of Drupal to load. Each phase adds to the
* previous one, so invoking a later phase automatically runs the earlier
* phases too. The most important usage is that if you want to access the
* Drupal database from a script without loading anything else, you can
* include bootstrap.inc, and call drupal_bootstrap(DRUPAL_BOOTSTRAP_DATABASE).
*
* @param $phase
* A constant. Allowed values are:
* DRUPAL_BOOTSTRAP_CONFIGURATION: initialize configuration.
* DRUPAL_BOOTSTRAP_EARLY_PAGE_CACHE: try to call a non-database cache fetch routine.
* DRUPAL_BOOTSTRAP_DATABASE: initialize database layer.
* DRUPAL_BOOTSTRAP_ACCESS: identify and reject banned hosts.
* DRUPAL_BOOTSTRAP_SESSION: initialize session handling.
* DRUPAL_BOOTSTRAP_LATE_PAGE_CACHE: load bootstrap.inc and module.inc, start
* the variable system and try to serve a page from the cache.
* DRUPAL_BOOTSTRAP_LANGUAGE: identify the language used on the page.
* DRUPAL_BOOTSTRAP_PATH: set $_GET['q'] to Drupal path of request.
* DRUPAL_BOOTSTRAP_FULL: Drupal is fully loaded, validate and fix input data.
*/
function drupal_bootstrap($phase) {
static $phases = array(DRUPAL_BOOTSTRAP_CONFIGURATION, DRUPAL_BOOTSTRAP_EARLY_PAGE_CACHE, DRUPAL_BOOTSTRAP_DATABASE, DRUPAL_BOOTSTRAP_ACCESS, DRUPAL_BOOTSTRAP_SESSION, DRUPAL_BOOTSTRAP_LATE_PAGE_CACHE, DRUPAL_BOOTSTRAP_LANGUAGE, DRUPAL_BOOTSTRAP_PATH, DRUPAL_BOOTSTRAP_FULL), $phase_index = 0;
while ($phase >= $phase_index && isset($phases[$phase_index])) {
$current_phase = $phases[$phase_index];
unset($phases[$phase_index++]);
_drupal_bootstrap($current_phase);
}
}
function _drupal_bootstrap($phase) {
global $conf;
switch ($phase) {
case DRUPAL_BOOTSTRAP_CONFIGURATION:
drupal_unset_globals();
// Start a page timer:
timer_start('page');
// Initialize the configuration
conf_init();
break;
case DRUPAL_BOOTSTRAP_EARLY_PAGE_CACHE:
// Allow specifying special cache handlers in settings.php, like
// using memcached or files for storing cache information.
require_once variable_get('cache_inc', './includes/cache.inc');
// If the page_cache_fastpath is set to TRUE in settings.php and
// page_cache_fastpath (implemented in the special implementation of
// cache.inc) printed the page and indicated this with a returned TRUE
// then we are done.
if (variable_get('page_cache_fastpath', FALSE) && page_cache_fastpath()) {
exit;
}
break;
case DRUPAL_BOOTSTRAP_DATABASE:
// Initialize the default database.
require_once './includes/database.inc';
db_set_active();
// Allow specifying alternate lock implementations in settings.php, like
// those using APC or memcached.
require_once variable_get('lock_inc', './includes/lock.inc');
lock_init();
break;
case DRUPAL_BOOTSTRAP_ACCESS:
// Deny access to hosts which were banned - t() is not yet available.
if (drupal_is_denied('host', ip_address())) {
header('HTTP/1.1 403 Forbidden');
print 'Sorry, '. check_plain(ip_address()) .' has been banned.';
exit();
}
break;
case DRUPAL_BOOTSTRAP_SESSION:
require_once variable_get('session_inc', './includes/session.inc');
session_set_save_handler('sess_open', 'sess_close', 'sess_read', 'sess_write', 'sess_destroy_sid', 'sess_gc');
session_start();
break;
case DRUPAL_BOOTSTRAP_LATE_PAGE_CACHE:
// Initialize configuration variables, using values from settings.php if available.
$conf = variable_init(isset($conf) ? $conf : array());
$cache_mode = variable_get('cache', CACHE_DISABLED);
// Get the page from the cache.
$cache = $cache_mode == CACHE_DISABLED ? '' : page_get_cache();
// If the skipping of the bootstrap hooks is not enforced, call hook_boot.
if (!$cache || $cache_mode != CACHE_AGGRESSIVE) {
// Load module handling.
require_once './includes/module.inc';
bootstrap_invoke_all('boot');
}
// If there is a cached page, display it.
if ($cache) {
drupal_page_cache_header($cache);
// If the skipping of the bootstrap hooks is not enforced, call hook_exit.
if ($cache_mode != CACHE_AGGRESSIVE) {
bootstrap_invoke_all('exit');
}
// We are done.
exit;
}
// Prepare for non-cached page workflow.
drupal_page_header();
break;
case DRUPAL_BOOTSTRAP_LANGUAGE:
drupal_init_language();
break;
case DRUPAL_BOOTSTRAP_PATH:
require_once './includes/path.inc';
// Initialize $_GET['q'] prior to loading modules and invoking hook_init().
drupal_init_path();
break;
case DRUPAL_BOOTSTRAP_FULL:
require_once './includes/common.inc';
_drupal_bootstrap_full();
break;
}
}
/**
* Enables use of the theme system without requiring database access.
*
* Loads and initializes the theme system for site installs, updates and when
* the site is in off-line mode. This also applies when the database fails.
*
* @see _drupal_maintenance_theme()
*/
function drupal_maintenance_theme() {
require_once './includes/theme.maintenance.inc';
_drupal_maintenance_theme();
}
/**
* Return the name of the localisation function. Use in code that needs to
* run both during installation and normal operation.
*/
function get_t() {
static $t;
if (is_null($t)) {
$t = function_exists('install_main') ? 'st' : 't';
}
return $t;
}
/**
* Choose a language for the current page, based on site and user preferences.
*/
function drupal_init_language() {
global $language, $user;
// Ensure the language is correctly returned, even without multilanguage support.
// Useful for eg. XML/HTML 'lang' attributes.
if (variable_get('language_count', 1) == 1) {
$language = language_default();
}
else {
include_once './includes/language.inc';
$language = language_initialize();
}
}
/**
* Get a list of languages set up indexed by the specified key
*
* @param $field The field to index the list with.
* @param $reset Boolean to request a reset of the list.
*/
function language_list($field = 'language', $reset = FALSE) {
static $languages = NULL;
// Reset language list
if ($reset) {
$languages = NULL;
}
// Init language list
if (!isset($languages)) {
if (variable_get('language_count', 1) > 1 || module_exists('locale')) {
$result = db_query('SELECT * FROM {languages} ORDER BY weight ASC, name ASC');
while ($row = db_fetch_object($result)) {
$languages['language'][$row->language] = $row;
}
}
else {
// No locale module, so use the default language only.
$default = language_default();
$languages['language'][$default->language] = $default;
}
}
// Return the array indexed by the right field
if (!isset($languages[$field])) {
$languages[$field] = array();
foreach ($languages['language'] as $lang) {
// Some values should be collected into an array
if (in_array($field, array('enabled', 'weight'))) {
$languages[$field][$lang->$field][$lang->language] = $lang;
}
else {
$languages[$field][$lang->$field] = $lang;
}
}
}
return $languages[$field];
}
/**
* Default language used on the site
*
* @param $property
* Optional property of the language object to return
*/
function language_default($property = NULL) {
$language = variable_get('language_default', (object) array('language' => 'en', 'name' => 'English', 'native' => 'English', 'direction' => 0, 'enabled' => 1, 'plurals' => 0, 'formula' => '', 'domain' => '', 'prefix' => '', 'weight' => 0, 'javascript' => ''));
return $property ? $language->$property : $language;
}
/**
* If Drupal is behind a reverse proxy, we use the X-Forwarded-For header
* instead of $_SERVER['REMOTE_ADDR'], which would be the IP address
* of the proxy server, and not the client's.
*
* @return
* IP address of client machine, adjusted for reverse proxy.
*/
function ip_address() {
static $ip_address = NULL;
if (!isset($ip_address)) {
$ip_address = $_SERVER['REMOTE_ADDR'];
if (variable_get('reverse_proxy', 0) && array_key_exists('HTTP_X_FORWARDED_FOR', $_SERVER)) {
// If an array of known reverse proxy IPs is provided, then trust
// the XFF header if request really comes from one of them.
$reverse_proxy_addresses = variable_get('reverse_proxy_addresses', array());
if (!empty($reverse_proxy_addresses) && in_array($ip_address, $reverse_proxy_addresses, TRUE)) {
// If there are several arguments, we need to check the most
// recently added one, i.e. the last one.
$ip_address_parts = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
$ip_address = array_pop($ip_address_parts);
}
}
}
return $ip_address;
}
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