<?php
/**
* A minimalistic XHTML PHP based template system implemented for simpleSAMLphp.
*
* @author Andreas Åkre Solberg, UNINETT AS. <andreas.solberg@uninett.no>
* @package simpleSAMLphp
* @version $Id$
*/
class SimpleSAML_XHTML_Template {
/**
* This is the default language map. It is used to map languages codes from the user agent to
* other language codes.
*/
private static $defaultLanguageMap = array('nb' => 'no');
private $configuration = null;
private $template = 'default.php';
private $language = null;
private $langtext = null;
public $data = null;
/**
* Associative array of dictionaries.
*/
private $dictionaries = array();
/**
* Constructor
*
* @param $configuration Configuration object
* @param $template Which template file to load
* @param $languagefile Optionally load a language file
*/
function __construct(SimpleSAML_Configuration $configuration, $template, $languagefile = null) {
$this->configuration = $configuration;
$this->template = $template;
$this->data['baseurlpath'] = $this->configuration->getBaseURL();
if (isset($_GET['language'])) {
$this->setLanguage($_GET['language']);
}
if (!empty($languagefile)) $this->includeLanguageFile($languagefile);
}
/**
* setLanguage() will set a cookie for the user's browser to remember what language
* was selected
*
* @param $language Language code for the language to set.
*/
public function setLanguage($language) {
$this->language = $language;
// setcookie ( string $name [, string $value [, int $expire [, string $path [, string $domain [, bool $secure [, bool $httponly ]]]]]] )
// time()+60*60*24*900 expires 900 days from now.
setcookie('language', $language, time()+60*60*24*900, '/');
}
/**
* getLanguage() will return the language selected by the user, or the default language
* This function first looks for a cached language code,
* then checks for a language cookie,
* then it tries to calculate the preferred language from HTTP headers.
* Last it returns the default language.
*/
public function getLanguage() {
// Language is set in object
if (isset($this->language)) {
return $this->language;
}
// Language is provided in a stored COOKIE
if (isset($_COOKIE['language'])) {
$this->language = $_COOKIE['language'];
return $this->language;
}
/* Check if we can find a good language from the Accept-Language http header. */
$httpLanguage = $this->getHTTPLanguage();
if ($httpLanguage !== NULL) {
return $httpLanguage;
}
// Language is not set, and we get the default language from the configuration.
return $this->getDefaultLanguage();
}
/**
* This function gets the prefered language for the user based on the Accept-Language http header.
*
* @return The prefered language based on the Accept-Language http header, or NULL if none of the
* languages in the header were available.
*/
private function getHTTPLanguage() {
$availableLanguages = $this->configuration->getValue('language.available');
$languageScore = SimpleSAML_Utilities::getAcceptLanguage();
/* For now we only use the default language map. We may use a configurable language map
* in the future.
*/
$languageMap = self::$defaultLanguageMap;
/* Find the available language with the best score. */
$bestLanguage = NULL;
$bestScore = -1.0;
foreach($languageScore as $language => $score) {
/* Apply the language map to the language code. */
if(array_key_exists($language, $languageMap)) {
$language = $languageMap[$language];
}
if(!in_array($language, $availableLanguages, TRUE)) {
/* Skip this language - we don't have it. */
continue;
}
/* Some user agents use very limited precicion of the quality value, but order the
* elements in descending order. Therefore we rely on the order of the output from
* getAcceptLanguage() matching the order of the languages in the header when two
* languages have the same quality.
*/
if($score > $bestScore) {
$bestLanguage = $language;
$bestScore = $score;
}
}
return $bestLanguage;
}
/**
* Returns the language base (from configuration)
*/
private function getBaseLanguage() {
return $this->configuration->getValue('language.base', 'en');
}
/**
* Returns the language default (from configuration)
*/
private function getDefaultLanguage() {
return $this->configuration->getValue('language.default', 'en');
}
/**
* Returns a list of all available languages.
*/
private function getLanguageList() {
$availableLanguages = $this->configuration->getValue('language.available');
$thisLang = $this->getLanguage();
$lang = array();
foreach ($availableLanguages AS $nl) {
$lang[$nl] = ($nl == $thisLang);
}
return $lang;
}
/**
* Includs a file relative to the template base directory.
* This function can be used to include headers and footers etc.
*
*/
private function includeAtTemplateBase($file) {
$data = $this->data;
$filename = $this->configuration->getPathValue('templatedir') . $this->configuration->getValue('theme.use') . '/' . $file;
if (!file_exists($filename)) {
SimpleSAML_Logger::error($_SERVER['PHP_SELF'].' - Template: Could not find template file [' . $file .
'] at [' . $filename . '] - Now trying at base');
$filename = $this->configuration->getPathValue('templatedir') . $this->configuration->getValue('theme.base') . '/' . $file;
if (!file_exists($filename)) {
SimpleSAML_Logger::error($_SERVER['PHP_SELF'].' - Template: Could not find template file [' . $file .
'] at [' . $filename . ']');
throw new Exception('Could not load template file [' . $file . ']');
}
}
include($filename);
}
/**
* Retrieve a dictionary.
*
* This function retrieves a dictionary with the given name.
*
* @param $name The name of the dictionary, as the filename in the dictionary directory,
* without the '.php'-ending.
* @return An associative array with the dictionary.
*/
private function getDictionary($name) {
assert('is_string($name)');
if(!array_key_exists($name, $this->dictionaries)) {
$dictDir = $this->configuration->getPathValue('dictionarydir');
$this->dictionaries[$name] = $this->readDictionaryFile($dictDir . $name . '.php');
}
return $this->dictionaries[$name];
}
/**
* Retrieve a tag.
*
* This function retrieves a tag as an array with language => string mappings.
*
* @param $tag The tag name. The tag name can also be on the form '{<dictionary>:<tag>}', to retrieve
* a tag from the specific dictionary.
* @return As associative array with language => string mappings, or NULL if the tag wasn't found.
*/
public function getTag($tag) {
assert('is_string($tag)');
if(substr($tag, 0, 1) === '{' && preg_match('/^{(\w+?):(.*)}$/', $tag, $matches)) {
$dictionary = $matches[1];
$tag = $matches[2];
$dictionary = $this->getDictionary($dictionary);
} else {
$dictionary = $this->langtext;
}
if(!array_key_exists($tag, $dictionary)) {
return NULL;
}
return $dictionary[$tag];
}
/**
* Retrieve the preferred translation of a given text.
*
* @param $translations The translations, as an associative array with language => text mappings.
* @return The preferred translation.
*/
public function getTranslation($translations) {
assert('is_array($translations)');
/* Look up translation of tag in the selected language. */
$selected_language = $this->getLanguage();
if (array_key_exists($selected_language, $translations)) {
return $translations[$selected_language];
}
/* Look up translation of tag in the default language. */
$default_language = $this->getDefaultLanguage();
if(array_key_exists($default_language, $translations)) {
return $translations[$default_language];
}
/* Look up translation of tag in the base language. */
$base_language = $this->getBaseLanguage();
if(array_key_exists($base_language, $translations)) {
return $translations[$base_language];
}
/* Pick the first translation available. */
if(count($translations) > 0) {
$languages = array_keys($translations);
return $translations[$languages[0]];
}
/* We don't have anything to return. */
throw new Exception('Nothing to return from translation.');
}
/**
* Include text in the current language.
*
* @param $tag A name tag of the string that should be returned.
* @param $replacements An associative array of keys that should be replaced with values in the translated string.
*/
public function t($tag, $replacements = array(), $fallbackdefault = true, $oldreplacements = array(), $striptags = false) {
if(!is_array($replacements)) {
/* Old style call to t(...). Print warning to log. */
$backtrace = debug_backtrace();
$where = $backtrace[0]['file'] . ':' . $backtrace[0]['line'];
SimpleSAML_Logger::warning('Deprecated use of SimpleSAML_Template::t(...) at ' . $where .
'. Please update the code to use the new style of parameters.');
/* For backwards compatibility. */
if(!$replacements && $this->getTag($tag) === NULL) {
SimpleSAML_Logger::warning('Code which uses $fallbackdefault === FALSE shouls be' .
' updated to use the getTag-method instead.');
return NULL;
}
$replacements = $oldreplacements;
}
if (empty($this->langtext) || !is_array($this->langtext)) {
SimpleSAML_Logger::error('Template: No language text loaded. Looking up [' . $tag . ']');
return $this->t_not_translated($tag, TRUE);
}
$tagData = $this->getTag($tag);
if($tagData === NULL) {
/* Tag not found. */
SimpleSAML_Logger::info('Template: Looking up [' . $tag . ']: not translated at all.');
return $this->t_not_translated($tag, TRUE);
}
$translated = $this->getTranslation($tagData);
foreach ($replacements as $k => $v) {
/* try to translate if no replacement is given */
if (!$v) $v = $this->t($k);
$translated = str_replace($k, $v, $translated);
}
return $translated;
}
/**
* Return the string that should be used when no translation was found.
*
* @param $tag A name tag of the string that should be returned.
* @param $fallbacktag If set to TRUE and string was not found in any languages, return
* the tag it self. If FALSE return NULL.
*/
private function t_not_translated($tag, $fallbacktag) {
if ($fallbacktag) {
return 'not translated (' . $tag . ')';
} else {
return NULL;
}
}
/**
* You can include translation inline instead of putting translation
* in dictionaries. This function is reccomended to only be used from dynamic
* data, or when the translation is already provided from an external source, as
* a database or in metadata.
*
* @param $tag The tag that has a translation
* @param $translation The translation array
*/
public function includeInlineTranslation($tag, $translation) {
if (is_string($translation)) {
$translation = array($this->getBaseLanguage() => $translation);
} elseif (!is_array($translation)) {
throw new Exception("Inline translation should be string or array. Is " . gettype($translation) . " now!");
}
if (!is_array($this->langtext))
$this->langtext = array();
SimpleSAML_Logger::info('Template: Adding inline language translation for tag [' . $tag . ']');
$this->langtext[$tag] = $translation;
}
/**
* Include language file from the dictionaries directory.
*
* @param $file File name of dictionary to include
* @param $otherConfig Optionally provide a different configuration object than
* the one provided in the constructor to be used to find the dictionary directory.
* This enables the possiblity of combining dictionaries inside simpleSAMLphp
* distribution with external dictionaries.
*/
public function includeLanguageFile($file, $otherConfig = null) {
$filebase = null;
if (!empty($otherConfig)) {
$filebase = $otherConfig->getPathValue('dictionarydir');
} else {
$filebase = $this->configuration->getPathValue('dictionarydir');
}
$lang = $this->readDictionaryFile($filebase . $file);
if (is_array($this->langtext)) {
SimpleSAML_Logger::info('Template: Merging language array. Loading [' . $file . ']');
$this->langtext = array_merge($this->langtext, $lang);
} else {
SimpleSAML_Logger::info('Template: Setting new language array. Loading [' . $file . ']');
$this->langtext = $lang;
}
}
/**
* Read a dictionary file.
*
* @param $filename The absolute path to the dictionary file.
* @return The translation array which was found in the dictionary file.
*/
private function readDictionaryFile($filename) {
assert('is_string($filename)');
SimpleSAML_Logger::info('Template: Reading [' . $filename . ']');
if (!file_exists($filename)) {
SimpleSAML_Logger::error($_SERVER['PHP_SELF'].' - Template: Could not find template file [' . $this->template . '] at [' . $filename . ']');
return array();
}
$lang = NULL;
include($filename);
if (isset($lang)) {
return $lang;
}
return array();
}
/**
* Show the template to the user.
*/
public function show() {
$filename = $this->configuration->getPathValue('templatedir') .
$this->configuration->getValue('theme.use') . '/' . $this->template;
if (!file_exists($filename)) {
SimpleSAML_Logger::warning($_SERVER['PHP_SELF'].' - Template: Could not find template file [' . $this->template . '] at [' . $filename . '] - now trying the base template');
$filename = $this->configuration->getPathValue('templatedir') .
$this->configuration->getValue('theme.base') . '/' . $this->template;
if (!file_exists($filename)) {
SimpleSAML_Logger::critical($_SERVER['PHP_SELF'].' - Template: Could not find template file [' . $this->template . '] at [' . $filename . ']');
echo 'Fatal error: Could not find template file [' . $this->template . '] at [' . $filename . ']';
exit(0);
}
}
require_once($filename);
}
}
?>