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   private function initialize() {
  67     $config = CRM_Core_Config::singleton();
  68
  69     if (isset($config->customTemplateDir) && $config->customTemplateDir) {
  70       $this->template_dir = array_merge([$config->customTemplateDir],
  71         $config->templateDir
  72       );
  73     }
  74     else {
  75       $this->template_dir = $config->templateDir;
  76     }
  77     $this->compile_dir = CRM_Utils_File::addTrailingSlash(CRM_Utils_File::addTrailingSlash($config->templateCompileDir) . $this->getLocale());
  78     CRM_Utils_File::createDir($this->compile_dir);
  79     CRM_Utils_File::restrictAccess($this->compile_dir);
  80
  81     // check and ensure it is writable
  82     // else we sometime suppress errors quietly and this results
  83     // in blank emails etc
  84     if (!is_writable($this->compile_dir)) {
  85       echo "CiviCRM does not have permission to write temp files in {$this->compile_dir}, Exiting";
  86       exit();
  87     }
  88
  89     $this->use_sub_dirs = TRUE;
  90
  91     $customPluginsDir = NULL;
  92     if (!empty($config->customPHPPathDir) || $config->customPHPPathDir === '0') {
  93       $customPluginsDir
  94         = $config->customPHPPathDir . DIRECTORY_SEPARATOR .
  95         'CRM' . DIRECTORY_SEPARATOR .
  96         'Core' . DIRECTORY_SEPARATOR .
  97         'Smarty' . DIRECTORY_SEPARATOR .
  98         'plugins' . DIRECTORY_SEPARATOR;
  99       if (!file_exists($customPluginsDir)) {
 100         $customPluginsDir = NULL;
 101       }
 102     }
 103
 104     $pkgsDir = Civi::paths()->getVariable('civicrm.packages', 'path');
 105     $smartyDir = $pkgsDir . DIRECTORY_SEPARATOR . 'Smarty' . DIRECTORY_SEPARATOR;
 106     $pluginsDir = __DIR__ . DIRECTORY_SEPARATOR . 'Smarty' . DIRECTORY_SEPARATOR . 'plugins' . DIRECTORY_SEPARATOR;
 107
 108     if ($customPluginsDir) {
 109       $this->plugins_dir = [$customPluginsDir, $smartyDir . 'plugins', $pluginsDir];
 110     }
 111     else {
 112       $this->plugins_dir = [$smartyDir . 'plugins', $pluginsDir];
 113     }
 114
 115     $this->compile_check = $this->isCheckSmartyIsCompiled();
 116
 117     // add the session and the config here
 118     $session = CRM_Core_Session::singleton();
 119
 120     $this->assign_by_ref('config', $config);
 121     $this->assign_by_ref('session', $session);
 122
 123     $tsLocale = CRM_Core_I18n::getLocale();
 124     $this->assign('tsLocale', $tsLocale);
 125
 126     // CRM-7163 hack: we don’t display langSwitch on upgrades anyway
 127     if (!CRM_Core_Config::isUpgradeMode()) {
 128       $this->assign('langSwitch', CRM_Core_I18n::uiLanguages());
 129     }
 130
 131     $this->register_function('crmURL', ['CRM_Utils_System', 'crmURL']);
 132     if (CRM_Utils_Constant::value('CIVICRM_SMARTY_DEFAULT_ESCAPE')) {
 133       // When default escape is enabled if the core escape is called before
 134       // any custom escaping is done the modifier_escape function is not
 135       // found, so require_once straight away. Note this was hit on the basic
 136       // contribution dashboard from RecentlyViewed.tpl
 137       require_once 'Smarty/plugins/modifier.escape.php';
 138       if (!isset($this->_plugins['modifier']['escape'])) {
 139         $this->register_modifier('escape', ['CRM_Core_Smarty', 'escape']);
 140       }
 141       $this->default_modifiers[] = 'escape:"htmlall"';
 142     }
 143     $this->load_filter('pre', 'resetExtScope');
 144
 145     $this->assign('crmPermissions', new CRM_Core_Smarty_Permissions());
 146
 147     if ($config->debug) {
 148       $this->error_reporting = E_ALL;
 149     }
 150   }
 151
 152   /**
 153    * Static instance provider.
 154    *
 155    * Method providing static instance of SmartTemplate, as
 156    * in Singleton pattern.
 157    *
 158    * @return \CRM_Core_Smarty
 159    */
 160   public static function &singleton() {
 161     if (!isset(self::$_singleton)) {
 162       self::$_singleton = new CRM_Core_Smarty();
 163       self::$_singleton->initialize();
 164
 165       self::registerStringResource();
 166     }
 167     return self::$_singleton;
 168   }
 169
 170   /**
 171    * Executes & returns or displays the template results
 172    *
 173    * @param string $resource_name
 174    * @param string $cache_id
 175    * @param string $compile_id
 176    * @param bool $display
 177    *
 178    * @return bool|mixed|string
 179    */
 180   public function fetch($resource_name, $cache_id = NULL, $compile_id = NULL, $display = FALSE) {
 181     if (preg_match('/^(\s+)?string:/', $resource_name)) {
 182       $old_security = $this->security;
 183       $this->security = TRUE;
 184     }
 185     $output = parent::fetch($resource_name, $cache_id, $compile_id, $display);
 186     if (isset($old_security)) {
 187       $this->security = $old_security;
 188     }
 189     return $output;
 190   }
 191
 192   /**
 193    * Ensure these variables are set to make it easier to access them without e-notice.
 194    *
 195    * @param array $variables
 196    */
 197   public function ensureVariablesAreAssigned(array $variables): void {
 198     foreach ($variables as $variable) {
 199       if (!isset($this->get_template_vars()[$variable])) {
 200         $this->assign($variable);
 201       }
 202     }
 203   }
 204
 205   /**
 206    * Avoid e-notices on pages with tabs,
 207    * by ensuring tabHeader items contain the necessary keys
 208    */
 209   public function addExpectedTabHeaderKeys(): void {
 210     $defaults = [
 211       'class' => '',
 212       'extra' => '',
 213       'icon' => FALSE,
 214       'count' => FALSE,
 215       'template' => FALSE,
 216     ];
 217
 218     $tabs = $this->get_template_vars('tabHeader');
 219     foreach ((array) $tabs as $i => $tab) {
 220       $tabs[$i] = array_merge($defaults, $tab);
 221     }
 222     $this->assign('tabHeader', $tabs);
 223   }
 224
 225   /**
 226    * Fetch a template (while using certain variables)
 227    *
 228    * @param string $resource_name
 229    * @param array $vars
 230    *   (string $name => mixed $value) variables to export to Smarty.
 231    * @throws Exception
 232    * @return bool|mixed|string
 233    */
 234   public function fetchWith($resource_name, $vars) {
 235     $this->pushScope($vars);
 236     try {
 237       $result = $this->fetch($resource_name);
 238     }
 239     catch (Exception $e) {
 240       // simulate try { ... } finally { ... }
 241       $this->popScope();
 242       throw $e;
 243     }
 244     $this->popScope();
 245     return $result;
 246   }
 247
 248   /**
 249    * @param string $name
 250    * @param $value
 251    */
 252   public function appendValue($name, $value) {
 253     $currentValue = $this->get_template_vars($name);
 254     if (!$currentValue) {
 255       $this->assign($name, $value);
 256     }
 257     else {
 258       if (strpos($currentValue, $value) === FALSE) {
 259         $this->assign($name, $currentValue . $value);
 260       }
 261     }
 262   }
 263
 264   public function clearTemplateVars() {
 265     foreach (array_keys($this->_tpl_vars) as $key) {
 266       if ($key == 'config' || $key == 'session') {
 267         continue;
 268       }
 269       unset($this->_tpl_vars[$key]);
 270     }
 271   }
 272
 273   public static function registerStringResource() {
 274     require_once 'CRM/Core/Smarty/resources/String.php';
 275     civicrm_smarty_register_string_resource();
 276   }
 277
 278   /**
 279    * @param $path
 280    */
 281   public function addTemplateDir($path) {
 282     if (is_array($this->template_dir)) {
 283       array_unshift($this->template_dir, $path);
 284     }
 285     else {
 286       $this->template_dir = [$path, $this->template_dir];
 287     }
 288
 289   }
 290
 291   /**
 292    * Temporarily assign a list of variables.
 293    *
 294    * ```
 295    * $smarty->pushScope(array(
 296    *   'first_name' => 'Alice',
 297    *   'last_name' => 'roberts',
 298    * ));
 299    * $html = $smarty->fetch('view-contact.tpl');
 300    * $smarty->popScope();
 301    * ```
 302    *
 303    * @param array $vars
 304    *   (string $name => mixed $value).
 305    * @return CRM_Core_Smarty
 306    * @see popScope
 307    */
 308   public function pushScope($vars) {
 309     $oldVars = $this->get_template_vars();
 310     $backupFrame = [];
 311     foreach ($vars as $key => $value) {
 312       $backupFrame[$key] = $oldVars[$key] ?? NULL;
 313     }
 314     $this->backupFrames[] = $backupFrame;
 315
 316     $this->assignAll($vars);
 317
 318     return $this;
 319   }
 320
 321   /**
 322    * Remove any values that were previously pushed.
 323    *
 324    * @return CRM_Core_Smarty
 325    * @see pushScope
 326    */
 327   public function popScope() {
 328     $this->assignAll(array_pop($this->backupFrames));
 329     return $this;
 330   }
 331
 332   /**
 333    * @param array $vars
 334    *   (string $name => mixed $value).
 335    * @return CRM_Core_Smarty
 336    */
 337   public function assignAll($vars) {
 338     foreach ($vars as $key => $value) {
 339       $this->assign($key, $value);
 340     }
 341     return $this;
 342   }
 343
 344   /**
 345    * Get the locale for translation.
 346    *
 347    * @return string
 348    */
 349   private function getLocale() {
 350     $tsLocale = CRM_Core_I18n::getLocale();
 351     if (!empty($tsLocale)) {
 352       return $tsLocale;
 353     }
 354
 355     $config = CRM_Core_Config::singleton();
 356     if (!empty($config->lcMessages)) {
 357       return $config->lcMessages;
 358     }
 359
 360     return 'en_US';
 361   }
 362
 363   /**
 364    * Get the compile_check value.
 365    *
 366    * @return bool
 367    */
 368   private function isCheckSmartyIsCompiled() {
 369     // check for define in civicrm.settings.php as FALSE, otherwise returns TRUE
 370     return CRM_Utils_Constant::value('CIVICRM_TEMPLATE_COMPILE_CHECK', TRUE);
 371   }
 372
 373   /**
 374    * Smarty escape modifier plugin.
 375    *
 376    * This replaces the core smarty modifier and basically does a lot of
 377    * early-returning before calling the core function.
 378    *
 379    * It early returns on patterns that are common 'no-escape' patterns
 380    * in CiviCRM - this list can be honed over time.
 381    *
 382    * It also logs anything that is actually escaped. Since this only kicks
 383    * in when CIVICRM_SMARTY_DEFAULT_ESCAPE is defined it is ok to be aggressive
 384    * about logging as we mostly care about developers using it at this stage.
 385    *
 386    * Note we don't actually use 'htmlall' anywhere in our tpl layer yet so
 387    * anything coming in with this be happening because of the default modifier.
 388    *
 389    * Also note the right way to opt a field OUT of escaping is
 390    * ``{$fieldName|smarty:nodefaults}``
 391    * This should be used for fields with known html AND for fields where
 392    * we are doing empty or isset checks - as otherwise the value is passed for
 393    * escaping first so you still get an enotice for 'empty' or a fatal for 'isset'
 394    *
 395    * Type:     modifier<br>
 396    * Name:     escape<br>
 397    * Purpose:  Escape the string according to escapement type
 398    *
 399    * @link http://smarty.php.net/manual/en/language.modifier.escape.php
 400    *          escape (Smarty online manual)
 401    * @author   Monte Ohrt <monte at ohrt dot com>
 402    *
 403    * @param string $string
 404    * @param string $esc_type
 405    * @param string $char_set
 406    *
 407    * @return string
 408    */
 409   public static function escape($string, $esc_type = 'html', $char_set = 'UTF-8') {
 410     // CiviCRM variables are often arrays - just handle them.
 411     // The early return on booleans & numbers is mostly to prevent them being
 412     // logged as 'changed' when they are cast to a string.
 413     if (!is_scalar($string) || empty($string) || is_bool($string) || is_numeric($string) || $esc_type === 'none') {
 414       return $string;
 415     }
 416     if ($esc_type === 'htmlall') {
 417       // 'htmlall' is the nothing-specified default.
 418       // Don't escape things we think quickform added.
 419       if (strpos($string, '<input') === 0
 420         || strpos($string, '<select') === 0
 421         // Not handling as yet but these ones really should get some love.
 422         || strpos($string, '<label') === 0
 423         || strpos($string, '<button') === 0
 424         || strpos($string, '<span class="crm-frozen-field">') === 0
 425         || strpos($string, '<textarea') === 0
 426
 427         // The ones below this point are hopefully here short term.
 428         || strpos($string, '<a') === 0
 429         // Message templates screen
 430         || strpos($string, '<span><a href') === 0
 431         // Not sure how big a pattern this is - used in Pledge view tab
 432         // not sure if it needs escaping
 433         || strpos($string, ' action="/civicrm/') === 0
 434         // eg. Tag edit page, civicrm/admin/financial/financialType/accounts?action=add&reset=1&aid=1
 435         || strpos($string, ' action="" method="post"') === 0
 436         // This seems to be urls...
 437         || strpos($string, '/civicrm/') === 0
 438         // Validation error message - eg. <span class="crm-error">Tournament Fees is a required field.</span>
 439         || strpos($string, '
 440     <span class="crm-error">') === 0
 441         // e.g from participant tab class="action-item" href=/civicrm/contact/view/participant?reset=1&amp;action=add&amp;cid=142&amp;context=participant
 442         || strpos($string, 'class="action-item" href=/civicrm/"') === 0
 443       ) {
 444         // Do not escape the above common patterns.
 445         return $string;
 446       }
 447     }
 448
 449     $value = smarty_modifier_escape($string, $esc_type, $char_set);
 450     if ($value !== $string) {
 451       Civi::log()->debug('smarty escaping original {original}, escaped {escaped} type {type} charset {charset}', [
 452         'original' => $string,
 453         'escaped' => $value,
 454         'type' => $esc_type,
 455         'charset' => $char_set,
 456       ]);
 457     }
 458     return $value;
 459   }
 460
 461 }