CRM/Core/Smarty.php

   1 <?php
   2 /*
   3  +--------------------------------------------------------------------+
   4  | Copyright CiviCRM LLC. All rights reserved.                        |
   5  |                                                                    |
   6  | This work is published under the GNU AGPLv3 license with some      |
   7  | permitted exceptions and without any warranty. For full license    |
   8  | and copyright information, see https://civicrm.org/licensing       |
   9  +--------------------------------------------------------------------+
  10  */
  11
  12 /**
  13  *
  14  * @package CRM
  15  * @copyright CiviCRM LLC https://civicrm.org/licensing
  16  */
  17
  18 /**
  19  * Fix for bug CRM-392. Not sure if this is the best fix or it will impact
  20  * other similar PEAR packages. doubt it
  21  */
  22 if (!class_exists('Smarty')) {
  23   require_once 'Smarty/Smarty.class.php';
  24 }
  25
  26 /**
  27  *
  28  */
  29 class CRM_Core_Smarty extends Smarty {
  30   const
  31     // use print.tpl and bypass the CMS. Civi prints a valid html file
  32     PRINT_PAGE = 1,
  33     // this and all the below bypasses the CMS html surrounding it and assumes we will embed this within other pages
  34     PRINT_SNIPPET = 2,
  35     // sends the generated html to the chosen pdf engine
  36     PRINT_PDF = 3,
  37     // this options also skips the enclosing form html and does not
  38     // generate any of the hidden fields, most notably qfKey
  39     // this is typically used in ajax scripts to embed form snippets based on user choices
  40     PRINT_NOFORM = 4,
  41     // this prints a complete form and also generates a qfKey, can we replace this with
  42     // snippet = 2?? Does the constant _NOFFORM do anything?
  43     PRINT_QFKEY = 5,
  44     // Note: added in v 4.3 with the value '6'
  45     // Value changed in 4.5 to 'json' for better readability
  46     // @see CRM_Core_Page_AJAX::returnJsonResponse
  47     PRINT_JSON = 'json';
  48
  49   /**
  50    * We only need one instance of this object. So we use the singleton
  51    * pattern and cache the instance in this variable
  52    *
  53    * @var object
  54    */
  55   static private $_singleton = NULL;
  56
  57   /**
  58    * Backup frames.
  59    *
  60    * A list of variables ot save temporarily in format (string $name => mixed $value).
  61    *
  62    * @var array
  63    */
  64   private $backupFrames = [];
  65
  66   /**
  67    * Class constructor.
  68    *
  69    * @return CRM_Core_Smarty
  70    */
  71   public function __construct() {
  72     parent::__construct();
  73   }
  74
  75   private function initialize() {
  76     $config = CRM_Core_Config::singleton();
  77
  78     if (isset($config->customTemplateDir) && $config->customTemplateDir) {
  79       $this->template_dir = array_merge([$config->customTemplateDir],
  80         $config->templateDir
  81       );
  82     }
  83     else {
  84       $this->template_dir = $config->templateDir;
  85     }
  86     $this->compile_dir = CRM_Utils_File::addTrailingSlash(CRM_Utils_File::addTrailingSlash($config->templateCompileDir) . $this->getLocale());
  87     CRM_Utils_File::createDir($this->compile_dir);
  88     CRM_Utils_File::restrictAccess($this->compile_dir);
  89
  90     // check and ensure it is writable
  91     // else we sometime suppress errors quietly and this results
  92     // in blank emails etc
  93     if (!is_writable($this->compile_dir)) {
  94       echo "CiviCRM does not have permission to write temp files in {$this->compile_dir}, Exiting";
  95       exit();
  96     }
  97
  98     $this->use_sub_dirs = TRUE;
  99
 100     $customPluginsDir = NULL;
 101     if (isset($config->customPHPPathDir)) {
 102       $customPluginsDir
 103         = $config->customPHPPathDir . DIRECTORY_SEPARATOR .
 104         'CRM' . DIRECTORY_SEPARATOR .
 105         'Core' . DIRECTORY_SEPARATOR .
 106         'Smarty' . DIRECTORY_SEPARATOR .
 107         'plugins' . DIRECTORY_SEPARATOR;
 108       if (!file_exists($customPluginsDir)) {
 109         $customPluginsDir = NULL;
 110       }
 111     }
 112
 113     $pkgsDir = Civi::paths()->getVariable('civicrm.packages', 'path');
 114     $smartyDir = $pkgsDir . DIRECTORY_SEPARATOR . 'Smarty' . DIRECTORY_SEPARATOR;
 115     $pluginsDir = __DIR__ . DIRECTORY_SEPARATOR . 'Smarty' . DIRECTORY_SEPARATOR . 'plugins' . DIRECTORY_SEPARATOR;
 116
 117     if ($customPluginsDir) {
 118       $this->plugins_dir = [$customPluginsDir, $smartyDir . 'plugins', $pluginsDir];
 119     }
 120     else {
 121       $this->plugins_dir = [$smartyDir . 'plugins', $pluginsDir];
 122     }
 123
 124     $this->compile_check = $this->isCheckSmartyIsCompiled();
 125
 126     // add the session and the config here
 127     $session = CRM_Core_Session::singleton();
 128
 129     $this->assign_by_ref('config', $config);
 130     $this->assign_by_ref('session', $session);
 131
 132     $tsLocale = CRM_Core_I18n::getLocale();
 133     $this->assign('tsLocale', $tsLocale);
 134
 135     // CRM-7163 hack: we don’t display langSwitch on upgrades anyway
 136     if (!CRM_Core_Config::isUpgradeMode()) {
 137       $this->assign('langSwitch', CRM_Core_I18n::uiLanguages());
 138     }
 139
 140     $this->register_function('crmURL', ['CRM_Utils_System', 'crmURL']);
 141     if (CRM_Utils_Constant::value('CIVICRM_SMARTY_DEFAULT_ESCAPE')) {
 142       if (!isset($this->_plugins['modifier']['escape'])) {
 143         $this->register_modifier('escape', ['CRM_Core_Smarty', 'escape']);
 144       }
 145       $this->default_modifiers[] = 'escape:"htmlall"';
 146     }
 147     $this->load_filter('pre', 'resetExtScope');
 148
 149     $this->assign('crmPermissions', new CRM_Core_Smarty_Permissions());
 150
 151     if ($config->debug) {
 152       $this->error_reporting = E_ALL;
 153     }
 154   }
 155
 156   /**
 157    * Static instance provider.
 158    *
 159    * Method providing static instance of SmartTemplate, as
 160    * in Singleton pattern.
 161    *
 162    * @return \CRM_Core_Smarty
 163    */
 164   public static function &singleton() {
 165     if (!isset(self::$_singleton)) {
 166       self::$_singleton = new CRM_Core_Smarty();
 167       self::$_singleton->initialize();
 168
 169       self::registerStringResource();
 170     }
 171     return self::$_singleton;
 172   }
 173
 174   /**
 175    * Executes & returns or displays the template results
 176    *
 177    * @param string $resource_name
 178    * @param string $cache_id
 179    * @param string $compile_id
 180    * @param bool $display
 181    *
 182    * @return bool|mixed|string
 183    */
 184   public function fetch($resource_name, $cache_id = NULL, $compile_id = NULL, $display = FALSE) {
 185     if (preg_match('/^(\s+)?string:/', $resource_name)) {
 186       $old_security = $this->security;
 187       $this->security = TRUE;
 188     }
 189     $output = parent::fetch($resource_name, $cache_id, $compile_id, $display);
 190     if (isset($old_security)) {
 191       $this->security = $old_security;
 192     }
 193     return $output;
 194   }
 195
 196   /**
 197    * Ensure these variables are set to make it easier to access them without e-notice.
 198    *
 199    * @param array $variables
 200    */
 201   public function ensureVariablesAreAssigned(array $variables): void {
 202     foreach ($variables as $variable) {
 203       if (!isset($this->get_template_vars()[$variable])) {
 204         $this->assign($variable);
 205       }
 206     }
 207   }
 208
 209   /**
 210    * Fetch a template (while using certain variables)
 211    *
 212    * @param string $resource_name
 213    * @param array $vars
 214    *   (string $name => mixed $value) variables to export to Smarty.
 215    * @throws Exception
 216    * @return bool|mixed|string
 217    */
 218   public function fetchWith($resource_name, $vars) {
 219     $this->pushScope($vars);
 220     try {
 221       $result = $this->fetch($resource_name);
 222     }
 223     catch (Exception $e) {
 224       // simulate try { ... } finally { ... }
 225       $this->popScope();
 226       throw $e;
 227     }
 228     $this->popScope();
 229     return $result;
 230   }
 231
 232   /**
 233    * @param string $name
 234    * @param $value
 235    */
 236   public function appendValue($name, $value) {
 237     $currentValue = $this->get_template_vars($name);
 238     if (!$currentValue) {
 239       $this->assign($name, $value);
 240     }
 241     else {
 242       if (strpos($currentValue, $value) === FALSE) {
 243         $this->assign($name, $currentValue . $value);
 244       }
 245     }
 246   }
 247
 248   public function clearTemplateVars() {
 249     foreach (array_keys($this->_tpl_vars) as $key) {
 250       if ($key == 'config' || $key == 'session') {
 251         continue;
 252       }
 253       unset($this->_tpl_vars[$key]);
 254     }
 255   }
 256
 257   public static function registerStringResource() {
 258     require_once 'CRM/Core/Smarty/resources/String.php';
 259     civicrm_smarty_register_string_resource();
 260   }
 261
 262   /**
 263    * @param $path
 264    */
 265   public function addTemplateDir($path) {
 266     if (is_array($this->template_dir)) {
 267       array_unshift($this->template_dir, $path);
 268     }
 269     else {
 270       $this->template_dir = [$path, $this->template_dir];
 271     }
 272
 273   }
 274
 275   /**
 276    * Temporarily assign a list of variables.
 277    *
 278    * ```
 279    * $smarty->pushScope(array(
 280    *   'first_name' => 'Alice',
 281    *   'last_name' => 'roberts',
 282    * ));
 283    * $html = $smarty->fetch('view-contact.tpl');
 284    * $smarty->popScope();
 285    * ```
 286    *
 287    * @param array $vars
 288    *   (string $name => mixed $value).
 289    * @return CRM_Core_Smarty
 290    * @see popScope
 291    */
 292   public function pushScope($vars) {
 293     $oldVars = $this->get_template_vars();
 294     $backupFrame = [];
 295     foreach ($vars as $key => $value) {
 296       $backupFrame[$key] = $oldVars[$key] ?? NULL;
 297     }
 298     $this->backupFrames[] = $backupFrame;
 299
 300     $this->assignAll($vars);
 301
 302     return $this;
 303   }
 304
 305   /**
 306    * Remove any values that were previously pushed.
 307    *
 308    * @return CRM_Core_Smarty
 309    * @see pushScope
 310    */
 311   public function popScope() {
 312     $this->assignAll(array_pop($this->backupFrames));
 313     return $this;
 314   }
 315
 316   /**
 317    * @param array $vars
 318    *   (string $name => mixed $value).
 319    * @return CRM_Core_Smarty
 320    */
 321   public function assignAll($vars) {
 322     foreach ($vars as $key => $value) {
 323       $this->assign($key, $value);
 324     }
 325     return $this;
 326   }
 327
 328   /**
 329    * Get the locale for translation.
 330    *
 331    * @return string
 332    */
 333   private function getLocale() {
 334     $tsLocale = CRM_Core_I18n::getLocale();
 335     if (!empty($tsLocale)) {
 336       return $tsLocale;
 337     }
 338
 339     $config = CRM_Core_Config::singleton();
 340     if (!empty($config->lcMessages)) {
 341       return $config->lcMessages;
 342     }
 343
 344     return 'en_US';
 345   }
 346
 347   /**
 348    * Get the compile_check value.
 349    *
 350    * @return bool
 351    */
 352   private function isCheckSmartyIsCompiled() {
 353     // check for define in civicrm.settings.php as FALSE, otherwise returns TRUE
 354     return CRM_Utils_Constant::value('CIVICRM_TEMPLATE_COMPILE_CHECK', TRUE);
 355   }
 356
 357   /**
 358    * Smarty escape modifier plugin.
 359    *
 360    * This replaces the core smarty modifier and basically does a lot of
 361    * early-returning before calling the core function.
 362    *
 363    * It early returns on patterns that are common 'no-escape' patterns
 364    * in CiviCRM - this list can be honed over time.
 365    *
 366    * It also logs anything that is actually escaped. Since this only kicks
 367    * in when CIVICRM_SMARTY_DEFAULT_ESCAPE is defined it is ok to be aggressive
 368    * about logging as we mostly care about developers using it at this stage.
 369    *
 370    * Note we don't actually use 'htmlall' anywhere in our tpl layer yet so
 371    * anything coming in with this be happening because of the default modifier.
 372    *
 373    * Also note the right way to opt a field OUT of escaping is
 374    * ``{$fieldName|smarty:nodefaults}``
 375    * This should be used for fields with known html AND for fields where
 376    * we are doing empty or isset checks - as otherwise the value is passed for
 377    * escaping first so you still get an enotice for 'empty' or a fatal for 'isset'
 378    *
 379    * Type:     modifier<br>
 380    * Name:     escape<br>
 381    * Purpose:  Escape the string according to escapement type
 382    *
 383    * @link http://smarty.php.net/manual/en/language.modifier.escape.php
 384    *          escape (Smarty online manual)
 385    * @author   Monte Ohrt <monte at ohrt dot com>
 386    *
 387    * @param string $string
 388    * @param string $esc_type
 389    * @param string $char_set
 390    *
 391    * @return string
 392    */
 393   public static function escape($string, $esc_type = 'html', $char_set = 'ISO-8859-1') {
 394     // CiviCRM variables are often arrays - just handle them.
 395     // The early return on booleans & numbers is mostly to prevent them being
 396     // logged as 'changed' when they are cast to a string.
 397     if (!is_scalar($string) || empty($string) || is_bool($string) || is_numeric($string) || $esc_type === 'none') {
 398       return $string;
 399     }
 400     if ($esc_type === 'htmlall') {
 401       // 'htmlall' is the nothing-specified default.
 402       // Don't escape things we think quickform added.
 403       if (strpos($string, '<input') === 0
 404         || strpos($string, '<select') === 0
 405         // Not handling as yet but these ones really should get some love.
 406         || strpos($string, '<label') === 0
 407         || strpos($string, '<button') === 0
 408         || strpos($string, '<span class="crm-frozen-field">') === 0
 409         || strpos($string, '<textarea') === 0
 410
 411         // The ones below this point are hopefully here short term.
 412         || strpos($string, '<a') === 0
 413         // Not sure how big a pattern this is - used in Pledge view tab
 414         // not sure if it needs escaping
 415         || strpos($string, ' action="/civicrm/') === 0
 416         // This seems to be urls...
 417         || strpos($string, '/civicrm/') === 0
 418         // Validation error message - eg. <span class="crm-error">Tournament Fees is a required field.</span>
 419         || strpos($string, '
 420     <span class="crm-error">') === 0
 421         // e.g from participant tab class="action-item" href=/civicrm/contact/view/participant?reset=1&amp;action=add&amp;cid=142&amp;context=participant
 422         || strpos($string, 'class="action-item" href=/civicrm/"') === 0
 423       ) {
 424         // Do not escape the above common patterns.
 425         return $string;
 426       }
 427     }
 428     require_once 'Smarty/plugins/modifier.escape.php';
 429     $value = smarty_modifier_escape($string, $esc_type, $char_set);
 430     if ($value !== $string) {
 431       Civi::log()->debug('smarty escaping original {original}, escaped {escaped} type {type} charset {charset}', [
 432         'original' => $string,
 433         'escaped' => $value,
 434         'type' => $esc_type,
 435         'charset' => $char_set,
 436       ]);
 437     }
 438     return $value;
 439   }
 440
 441 }