src/Core/L10n.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   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\Core;
  23
  24 use Friendica\Core\Config\IConfig;
  25 use Friendica\Core\Session\ISession;
  26 use Friendica\Database\Database;
  27 use Friendica\Util\Strings;
  28 use Psr\Log\LoggerInterface;
  29
  30 /**
  31  * Provide Language, Translation, and Localization functions to the application
  32  * Localization can be referred to by the numeronym L10N (as in: "L", followed by ten more letters, and then "N").
  33  */
  34 class L10n
  35 {
  36         /** @var string The default language */
  37         const DEFAULT = 'en';
  38
  39         /**
  40          * A string indicating the current language used for translation:
  41          * - Two-letter ISO 639-1 code.
  42          * - Two-letter ISO 639-1 code + dash + Two-letter ISO 3166-1 alpha-2 country code.
  43          *
  44          * @var string
  45          */
  46         private $lang = '';
  47
  48         /**
  49          * An array of translation strings whose key is the neutral english message.
  50          *
  51          * @var array
  52          */
  53         private $strings = [];
  54
  55         /**
  56          * @var Database
  57          */
  58         private $dba;
  59
  60         /**
  61          * @var LoggerInterface
  62          */
  63         private $logger;
  64
  65         public function __construct(IConfig $config, Database $dba, LoggerInterface $logger, ISession $session, array $server, array $get)
  66         {
  67                 $this->dba    = $dba;
  68                 $this->logger = $logger;
  69
  70                 $this->loadTranslationTable(L10n::detectLanguage($server, $get, $config->get('system', 'language', self::DEFAULT)));
  71                 $this->setSessionVariable($session);
  72                 $this->setLangFromSession($session);
  73         }
  74
  75         /**
  76          * Returns the current language code
  77          *
  78          * @return string Language code
  79          */
  80         public function getCurrentLang()
  81         {
  82                 return $this->lang;
  83         }
  84
  85         /**
  86          * Sets the language session variable
  87          */
  88         private function setSessionVariable(ISession $session)
  89         {
  90                 if ($session->get('authenticated') && !$session->get('language')) {
  91                         $session->set('language', $this->lang);
  92                         // we haven't loaded user data yet, but we need user language
  93                         if ($session->get('uid')) {
  94                                 $user = $this->dba->selectFirst('user', ['language'], ['uid' => $_SESSION['uid']]);
  95                                 if ($this->dba->isResult($user)) {
  96                                         $session->set('language', $user['language']);
  97                                 }
  98                         }
  99                 }
 100
 101                 if (isset($_GET['lang'])) {
 102                         $session->set('language', $_GET['lang']);
 103                 }
 104         }
 105
 106         private function setLangFromSession(ISession $session)
 107         {
 108                 if ($session->get('language') !== $this->lang) {
 109                         $this->loadTranslationTable($session->get('language'));
 110                 }
 111         }
 112
 113         /**
 114          * Loads string translation table
 115          *
 116          * First addon strings are loaded, then globals
 117          *
 118          * Uses an App object shim since all the strings files refer to $a->strings
 119          *
 120          * @param string $lang language code to load
 121          *
 122          * @throws \Exception
 123          */
 124         private function loadTranslationTable($lang)
 125         {
 126                 $lang = Strings::sanitizeFilePathItem($lang);
 127
 128                 // Don't override the language setting with empty languages
 129                 if (empty($lang)) {
 130                         return;
 131                 }
 132
 133                 $a          = new \stdClass();
 134                 $a->strings = [];
 135
 136                 // load enabled addons strings
 137                 $addons = $this->dba->select('addon', ['name'], ['installed' => true]);
 138                 while ($p = $this->dba->fetch($addons)) {
 139                         $name = Strings::sanitizeFilePathItem($p['name']);
 140                         if (file_exists(__DIR__ . "/../../addon/$name/lang/$lang/strings.php")) {
 141                                 include __DIR__ . "/../../addon/$name/lang/$lang/strings.php";
 142                         }
 143                 }
 144
 145                 if (file_exists(__DIR__ . "/../../view/lang/$lang/strings.php")) {
 146                         include __DIR__ . "/../../view/lang/$lang/strings.php";
 147                 }
 148
 149                 $this->lang    = $lang;
 150                 $this->strings = $a->strings;
 151
 152                 unset($a);
 153         }
 154
 155         /**
 156          * Returns the preferred language from the HTTP_ACCEPT_LANGUAGE header
 157          *
 158          * @param string $sysLang The default fallback language
 159          * @param array  $server  The $_SERVER array
 160          * @param array  $get     The $_GET array
 161          *
 162          * @return string The two-letter language code
 163          */
 164         public static function detectLanguage(array $server, array $get, string $sysLang = self::DEFAULT)
 165         {
 166                 $lang_variable = $server['HTTP_ACCEPT_LANGUAGE'] ?? null;
 167
 168                 $acceptedLanguages = preg_split('/,\s*/', $lang_variable);
 169
 170                 if (empty($acceptedLanguages)) {
 171                         $acceptedLanguages = [];
 172                 }
 173
 174                 // Add get as absolute quality accepted language (except this language isn't valid)
 175                 if (!empty($get['lang'])) {
 176                         $acceptedLanguages[] = $get['lang'];
 177                 }
 178
 179                 // return the sys language in case there's nothing to do
 180                 if (empty($acceptedLanguages)) {
 181                         return $sysLang;
 182                 }
 183
 184                 // Set the syslang as default fallback
 185                 $current_lang = $sysLang;
 186                 // start with quality zero (every guessed language is more acceptable ..)
 187                 $current_q = 0;
 188
 189                 foreach ($acceptedLanguages as $acceptedLanguage) {
 190                         $res = preg_match(
 191                                 '/^([a-z]{1,8}(?:-[a-z]{1,8})*)(?:;\s*q=(0(?:\.[0-9]{1,3})?|1(?:\.0{1,3})?))?$/i',
 192                                 $acceptedLanguage,
 193                                 $matches
 194                         );
 195
 196                         // Invalid language? -> skip
 197                         if (!$res) {
 198                                 continue;
 199                         }
 200
 201                         // split language codes based on it's "-"
 202                         $lang_code = explode('-', $matches[1]);
 203
 204                         // determine the quality of the guess
 205                         if (isset($matches[2])) {
 206                                 $lang_quality = (float)$matches[2];
 207                         } else {
 208                                 // fallback so without a quality parameter, it's probably the best
 209                                 $lang_quality = 1;
 210                         }
 211
 212                         // loop through each part of the code-parts
 213                         while (count($lang_code)) {
 214                                 // try to mix them so we can get double-code parts too
 215                                 $match_lang = strtolower(join('-', $lang_code));
 216                                 if (file_exists(__DIR__ . "/../../view/lang/$match_lang") &&
 217                                     is_dir(__DIR__ . "/../../view/lang/$match_lang")) {
 218                                         if ($lang_quality > $current_q) {
 219                                                 $current_lang = $match_lang;
 220                                                 $current_q    = $lang_quality;
 221                                                 break;
 222                                         }
 223                                 }
 224
 225                                 // remove the most right code-part
 226                                 array_pop($lang_code);
 227                         }
 228                 }
 229
 230                 return $current_lang;
 231         }
 232
 233         /**
 234          * Return the localized version of the provided string with optional string interpolation
 235          *
 236          * This function takes a english string as parameter, and if a localized version
 237          * exists for the current language, substitutes it before performing an eventual
 238          * string interpolation (sprintf) with additional optional arguments.
 239          *
 240          * Usages:
 241          * - DI::l10n()->t('This is an example')
 242          * - DI::l10n()->t('URL %s returned no result', $url)
 243          * - DI::l10n()->t('Current version: %s, new version: %s', $current_version, $new_version)
 244          *
 245          * @param string $s
 246          * @param array  $vars Variables to interpolate in the translation string
 247          *
 248          * @return string
 249          */
 250         public function t($s, ...$vars)
 251         {
 252                 if (empty($s)) {
 253                         return '';
 254                 }
 255
 256                 if (!empty($this->strings[$s])) {
 257                         $t = $this->strings[$s];
 258                         $s = is_array($t) ? $t[0] : $t;
 259                 }
 260
 261                 if (count($vars) > 0) {
 262                         $s = sprintf($s, ...$vars);
 263                 }
 264
 265                 return $s;
 266         }
 267
 268         /**
 269          * Return the localized version of a singular/plural string with optional string interpolation
 270          *
 271          * This function takes two english strings as parameters, singular and plural, as
 272          * well as a count. If a localized version exists for the current language, they
 273          * are used instead. Discrimination between singular and plural is done using the
 274          * localized function if any or the default one. Finally, a string interpolation
 275          * is performed using the count as parameter.
 276          *
 277          * Usages:
 278          * - DI::l10n()->tt('Like', 'Likes', $count)
 279          * - DI::l10n()->tt("%s user deleted", "%s users deleted", count($users))
 280          *
 281          * @param string $singular
 282          * @param string $plural
 283          * @param int    $count
 284          *
 285          * @return string
 286          * @throws \Exception
 287          */
 288         public function tt(string $singular, string $plural, int $count)
 289         {
 290                 if (!empty($this->strings[$singular])) {
 291                         $t = $this->strings[$singular];
 292                         if (is_array($t)) {
 293                                 $plural_function = 'string_plural_select_' . str_replace('-', '_', $this->lang);
 294                                 if (function_exists($plural_function)) {
 295                                         $i = $plural_function($count);
 296                                 } else {
 297                                         $i = $this->stringPluralSelectDefault($count);
 298                                 }
 299
 300                                 // for some languages there is only a single array item
 301                                 if (!isset($t[$i])) {
 302                                         $s = $t[0];
 303                                 } else {
 304                                         $s = $t[$i];
 305                                 }
 306                         } else {
 307                                 $s = $t;
 308                         }
 309                 } elseif ($this->stringPluralSelectDefault($count)) {
 310                         $s = $plural;
 311                 } else {
 312                         $s = $singular;
 313                 }
 314
 315                 $s = @sprintf($s, $count);
 316
 317                 return $s;
 318         }
 319
 320         /**
 321          * Provide a fallback which will not collide with a function defined in any language file
 322          *
 323          * @param int $n
 324          *
 325          * @return bool
 326          */
 327         private function stringPluralSelectDefault($n)
 328         {
 329                 return $n != 1;
 330         }
 331
 332         /**
 333          * Return installed languages codes as associative array
 334          *
 335          * Scans the view/lang directory for the existence of "strings.php" files, and
 336          * returns an alphabetical list of their folder names (@-char language codes).
 337          * Adds the english language if it's missing from the list.
 338          *
 339          * Ex: array('de' => 'de', 'en' => 'en', 'fr' => 'fr', ...)
 340          *
 341          * @return array
 342          */
 343         public static function getAvailableLanguages()
 344         {
 345                 $langs              = [];
 346                 $strings_file_paths = glob('view/lang/*/strings.php');
 347
 348                 if (is_array($strings_file_paths) && count($strings_file_paths)) {
 349                         if (!in_array('view/lang/en/strings.php', $strings_file_paths)) {
 350                                 $strings_file_paths[] = 'view/lang/en/strings.php';
 351                         }
 352                         asort($strings_file_paths);
 353                         foreach ($strings_file_paths as $strings_file_path) {
 354                                 $path_array            = explode('/', $strings_file_path);
 355                                 $langs[$path_array[2]] = $path_array[2];
 356                         }
 357                 }
 358                 return $langs;
 359         }
 360
 361         /**
 362          * Translate days and months names.
 363          *
 364          * @param string $s String with day or month name.
 365          *
 366          * @return string Translated string.
 367          */
 368         public function getDay($s)
 369         {
 370                 $ret = str_replace(['Monday', 'Tuesday', 'Wednesday', 'Thursday', 'Friday', 'Saturday', 'Sunday'],
 371                         [$this->t('Monday'), $this->t('Tuesday'), $this->t('Wednesday'), $this->t('Thursday'), $this->t('Friday'), $this->t('Saturday'), $this->t('Sunday')],
 372                         $s);
 373
 374                 $ret = str_replace(['January', 'February', 'March', 'April', 'May', 'June', 'July', 'August', 'September', 'October', 'November', 'December'],
 375                         [$this->t('January'), $this->t('February'), $this->t('March'), $this->t('April'), $this->t('May'), $this->t('June'), $this->t('July'), $this->t('August'), $this->t('September'), $this->t('October'), $this->t('November'), $this->t('December')],
 376                         $ret);
 377
 378                 return $ret;
 379         }
 380
 381         /**
 382          * Translate short days and months names.
 383          *
 384          * @param string $s String with short day or month name.
 385          *
 386          * @return string Translated string.
 387          */
 388         public function getDayShort($s)
 389         {
 390                 $ret = str_replace(['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'],
 391                         [$this->t('Mon'), $this->t('Tue'), $this->t('Wed'), $this->t('Thu'), $this->t('Fri'), $this->t('Sat'), $this->t('Sun')],
 392                         $s);
 393
 394                 $ret = str_replace(['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
 395                         [$this->t('Jan'), $this->t('Feb'), $this->t('Mar'), $this->t('Apr'), $this->t('May'), $this->t('Jun'), $this->t('Jul'), $this->t('Aug'), $this->t('Sep'), $this->t('Oct'), $this->t('Nov'), $this->t('Dec')],
 396                         $ret);
 397
 398                 return $ret;
 399         }
 400
 401         /**
 402          * Load poke verbs
 403          *
 404          * @return array index is present tense verb
 405          *                 value is array containing past tense verb, translation of present, translation of past
 406          * @throws \Friendica\Network\HTTPException\InternalServerErrorException
 407          * @hook poke_verbs pokes array
 408          */
 409         public function getPokeVerbs()
 410         {
 411                 // index is present tense verb
 412                 // value is array containing past tense verb, translation of present, translation of past
 413                 $arr = [
 414                         'poke'   => ['poked', $this->t('poke'), $this->t('poked')],
 415                         'ping'   => ['pinged', $this->t('ping'), $this->t('pinged')],
 416                         'prod'   => ['prodded', $this->t('prod'), $this->t('prodded')],
 417                         'slap'   => ['slapped', $this->t('slap'), $this->t('slapped')],
 418                         'finger' => ['fingered', $this->t('finger'), $this->t('fingered')],
 419                         'rebuff' => ['rebuffed', $this->t('rebuff'), $this->t('rebuffed')],
 420                 ];
 421
 422                 Hook::callAll('poke_verbs', $arr);
 423
 424                 return $arr;
 425         }
 426
 427         /**
 428          * Creates a new L10n instance based on the given langauge
 429          *
 430          * @param string $lang The new language
 431          *
 432          * @return static A new L10n instance
 433          * @throws \Exception
 434          */
 435         public function withLang(string $lang)
 436         {
 437                 // Don't create a new instance for same language
 438                 if ($lang === $this->lang) {
 439                         return $this;
 440                 }
 441
 442                 $newL10n = clone $this;
 443                 $newL10n->loadTranslationTable($lang);
 444                 return $newL10n;
 445         }
 446 }