src/Render/FriendicaSmartyEngine.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Render;
  23
  24 use Friendica\Core\Hook;
  25 use Friendica\DI;
  26 use Friendica\Network\HTTPException\ServiceUnavailableException;
  27 use Friendica\Util\Strings;
  28
  29 /**
  30  * Smarty implementation of the Friendica template abstraction
  31  */
  32 final class FriendicaSmartyEngine extends TemplateEngine
  33 {
  34         static $name = "smarty3";
  35
  36         const FILE_PREFIX = 'file:';
  37         const STRING_PREFIX = 'string:';
  38
  39         /** @var FriendicaSmarty */
  40         private $smarty;
  41
  42         /**
  43          * @inheritDoc
  44          */
  45         public function __construct(string $theme, array $theme_info)
  46         {
  47                 $this->theme = $theme;
  48                 $this->theme_info = $theme_info;
  49                 $this->smarty = new FriendicaSmarty($this->theme, $this->theme_info);
  50
  51                 if (!is_writable(DI::basePath() . '/view/smarty3')) {
  52                         $admin_message = DI::l10n()->t('The folder view/smarty3/ must be writable by webserver.');
  53                         DI::logger()->critical($admin_message);
  54                         $message = is_site_admin() ?
  55                                 $admin_message :
  56                                 DI::l10n()->t('Friendica can\'t display this page at the moment, please contact the administrator.');
  57                         throw new ServiceUnavailableException($message);
  58                 }
  59         }
  60
  61         /**
  62          * @inheritDoc
  63          */
  64         public function testInstall(array &$errors = null)
  65         {
  66                 $this->smarty->testInstall($errors);
  67         }
  68
  69         /**
  70          * @inheritDoc
  71          */
  72         public function replaceMacros(string $template, array $vars)
  73         {
  74                 if (!Strings::startsWith($template, self::FILE_PREFIX)) {
  75                         $template = self::STRING_PREFIX . $template;
  76                 }
  77
  78                 // "middleware": inject variables into templates
  79                 $arr = [
  80                         'template' => basename($this->smarty->filename),
  81                         'vars' => $vars
  82                 ];
  83                 Hook::callAll('template_vars', $arr);
  84                 $vars = $arr['vars'];
  85
  86                 $this->smarty->clearAllAssign();
  87
  88                 foreach ($vars as $key => $value) {
  89                         if ($key[0] === '$') {
  90                                 $key = substr($key, 1);
  91                         }
  92
  93                         $this->smarty->assign($key, $value);
  94                 }
  95
  96                 return $this->smarty->fetch($template);
  97         }
  98
  99         /**
 100          * @inheritDoc
 101          */
 102         public function getTemplateFile(string $file, string $subDir = '')
 103         {
 104                 // Make sure $root ends with a slash /
 105                 if ($subDir !== '' && substr($subDir, -1, 1) !== '/') {
 106                         $subDir = $subDir . '/';
 107                 }
 108
 109                 $root = DI::basePath() . '/' . $subDir;
 110
 111                 $filename = $this->smarty::SMARTY3_TEMPLATE_FOLDER . '/' . $file;
 112
 113                 if (file_exists("{$root}view/theme/$this->theme/$filename")) {
 114                         $template_file = "{$root}view/theme/$this->theme/$filename";
 115                 } elseif (!empty($this->theme_info['extends']) && file_exists(sprintf('%sview/theme/%s}/%s', $root, $this->theme_info['extends'], $filename))) {
 116                         $template_file = sprintf('%sview/theme/%s}/%s', $root, $this->theme_info['extends'], $filename);
 117                 } elseif (file_exists("{$root}/$filename")) {
 118                         $template_file = "{$root}/$filename";
 119                 } else {
 120                         $template_file = "{$root}view/$filename";
 121                 }
 122
 123                 $this->smarty->filename = $template_file;
 124
 125                 return self::FILE_PREFIX . $template_file;
 126         }
 127 }