include/functions.php

   1 <?php
   2         define('EXPECTED_CONFIG_VERSION', 26);
   3         define('SCHEMA_VERSION', 133);
   4
   5         define('LABEL_BASE_INDEX', -1024);
   6         define('PLUGIN_FEED_BASE_INDEX', -128);
   7
   8         define('COOKIE_LIFETIME_LONG', 86400*365);
   9
  10         $fetch_last_error = false;
  11         $fetch_last_error_code = false;
  12         $fetch_last_content_type = false;
  13         $fetch_last_error_content = false; // curl only for the time being
  14         $fetch_curl_used = false;
  15         $suppress_debugging = false;
  16
  17         libxml_disable_entity_loader(true);
  18
  19         // separate test because this is included before sanity checks
  20         if (function_exists("mb_internal_encoding")) mb_internal_encoding("UTF-8");
  21
  22         date_default_timezone_set('UTC');
  23         if (defined('E_DEPRECATED')) {
  24                 error_reporting(E_ALL & ~E_NOTICE & ~E_DEPRECATED);
  25         } else {
  26                 error_reporting(E_ALL & ~E_NOTICE);
  27         }
  28
  29         require_once 'config.php';
  30
  31         /**
  32          * Define a constant if not already defined
  33          */
  34         function define_default($name, $value) {
  35                 defined($name) or define($name, $value);
  36         }
  37
  38         /* Some tunables you can override in config.php using define(): */
  39
  40         define_default('FEED_FETCH_TIMEOUT', 45);
  41         // How may seconds to wait for response when requesting feed from a site
  42         define_default('FEED_FETCH_NO_CACHE_TIMEOUT', 15);
  43         // How may seconds to wait for response when requesting feed from a
  44         // site when that feed wasn't cached before
  45         define_default('FILE_FETCH_TIMEOUT', 45);
  46         // Default timeout when fetching files from remote sites
  47         define_default('FILE_FETCH_CONNECT_TIMEOUT', 15);
  48         // How many seconds to wait for initial response from website when
  49         // fetching files from remote sites
  50         define_default('DAEMON_UPDATE_LOGIN_LIMIT', 30);
  51         // stop updating feeds if users haven't logged in for X days
  52         define_default('DAEMON_FEED_LIMIT', 500);
  53         // feed limit for one update batch
  54         define_default('DAEMON_SLEEP_INTERVAL', 120);
  55         // default sleep interval between feed updates (sec)
  56         define_default('MIN_CACHE_FILE_SIZE', 1024);
  57         // do not cache files smaller than that (bytes)
  58         define_default('CACHE_MAX_DAYS', 7);
  59         // max age in days for various automatically cached (temporary) files
  60     define_default('MAX_CONDITIONAL_INTERVAL', 3600*12);
  61     // max interval between forced unconditional updates for servers
  62     // not complying with http if-modified-since (seconds)
  63
  64         /* tunables end here */
  65
  66         if (DB_TYPE == "pgsql") {
  67                 define('SUBSTRING_FOR_DATE', 'SUBSTRING_FOR_DATE');
  68         } else {
  69                 define('SUBSTRING_FOR_DATE', 'SUBSTRING');
  70         }
  71
  72         /**
  73          * Return available translations names.
  74          *
  75          * @access public
  76          * @return array A array of available translations.
  77          */
  78         function get_translations() {
  79                 $tr = array(
  80                                         "auto"  => "Detect automatically",
  81                                         "ar_SA" => "العربيّة (Arabic)",
  82                                         "bg_BG" => "Bulgarian",
  83                                         "da_DA" => "Dansk",
  84                                         "ca_CA" => "Català",
  85                                         "cs_CZ" => "Česky",
  86                                         "en_US" => "English",
  87                                         "el_GR" => "Ελληνικά",
  88                                         "es_ES" => "Español (España)",
  89                                         "es_LA" => "Español",
  90                                         "de_DE" => "Deutsch",
  91                                         "fr_FR" => "Français",
  92                                         "hu_HU" => "Magyar (Hungarian)",
  93                                         "it_IT" => "Italiano",
  94                                         "ja_JP" => "日本語 (Japanese)",
  95                                         "lv_LV" => "Latviešu",
  96                                         "nb_NO" => "Norwegian bokmål",
  97                                         "nl_NL" => "Dutch",
  98                                         "pl_PL" => "Polski",
  99                                         "ru_RU" => "Русский",
 100                                         "pt_BR" => "Portuguese/Brazil",
 101                                         "pt_PT" => "Portuguese/Portugal",
 102                                         "zh_CN" => "Simplified Chinese",
 103                                         "zh_TW" => "Traditional Chinese",
 104                                         "sv_SE" => "Svenska",
 105                                         "fi_FI" => "Suomi",
 106                                         "tr_TR" => "Türkçe");
 107
 108                 return $tr;
 109         }
 110
 111         require_once "lib/accept-to-gettext.php";
 112         require_once "lib/gettext/gettext.inc";
 113
 114         function startup_gettext() {
 115
 116                 # Get locale from Accept-Language header
 117                 $lang = al2gt(array_keys(get_translations()), "text/html");
 118
 119                 if (defined('_TRANSLATION_OVERRIDE_DEFAULT')) {
 120                         $lang = _TRANSLATION_OVERRIDE_DEFAULT;
 121                 }
 122
 123                 if ($_SESSION["uid"] && get_schema_version() >= 120) {
 124                         $pref_lang = get_pref("USER_LANGUAGE", $_SESSION["uid"]);
 125
 126                         if ($pref_lang && $pref_lang != 'auto') {
 127                                 $lang = $pref_lang;
 128                         }
 129                 }
 130
 131                 if ($lang) {
 132                         if (defined('LC_MESSAGES')) {
 133                                 _setlocale(LC_MESSAGES, $lang);
 134                         } else if (defined('LC_ALL')) {
 135                                 _setlocale(LC_ALL, $lang);
 136                         }
 137
 138                         _bindtextdomain("messages", "locale");
 139
 140                         _textdomain("messages");
 141                         _bind_textdomain_codeset("messages", "UTF-8");
 142                 }
 143         }
 144
 145         require_once 'db-prefs.php';
 146         require_once 'version.php';
 147         require_once 'controls.php';
 148
 149         define('SELF_USER_AGENT', 'Tiny Tiny RSS/' . VERSION . ' (http://tt-rss.org/)');
 150         ini_set('user_agent', SELF_USER_AGENT);
 151
 152         $schema_version = false;
 153
 154         function _debug_suppress($suppress) {
 155                 global $suppress_debugging;
 156
 157                 $suppress_debugging = $suppress;
 158         }
 159
 160         /**
 161          * Print a timestamped debug message.
 162          *
 163          * @param string $msg The debug message.
 164          * @return void
 165          */
 166         function _debug($msg, $show = true) {
 167                 global $suppress_debugging;
 168
 169                 //echo "[$suppress_debugging] $msg $show\n";
 170
 171                 if ($suppress_debugging) return false;
 172
 173                 $ts = strftime("%H:%M:%S", time());
 174                 if (function_exists('posix_getpid')) {
 175                         $ts = "$ts/" . posix_getpid();
 176                 }
 177
 178                 if ($show && !(defined('QUIET') && QUIET)) {
 179                         print "[$ts] $msg\n";
 180                 }
 181
 182                 if (defined('LOGFILE'))  {
 183                         $fp = fopen(LOGFILE, 'a+');
 184
 185                         if ($fp) {
 186                                 $locked = false;
 187
 188                                 if (function_exists("flock")) {
 189                                         $tries = 0;
 190
 191                                         // try to lock logfile for writing
 192                                         while ($tries < 5 && !$locked = flock($fp, LOCK_EX | LOCK_NB)) {
 193                                                 sleep(1);
 194                                                 ++$tries;
 195                                         }
 196
 197                                         if (!$locked) {
 198                                                 fclose($fp);
 199                                                 return;
 200                                         }
 201                                 }
 202
 203                                 fputs($fp, "[$ts] $msg\n");
 204
 205                                 if (function_exists("flock")) {
 206                                         flock($fp, LOCK_UN);
 207                                 }
 208
 209                                 fclose($fp);
 210                         }
 211                 }
 212
 213         } // function _debug
 214
 215         /**
 216          * Purge a feed old posts.
 217          *
 218          * @param mixed $link A database connection.
 219          * @param mixed $feed_id The id of the purged feed.
 220          * @param mixed $purge_interval Olderness of purged posts.
 221          * @param boolean $debug Set to True to enable the debug. False by default.
 222          * @access public
 223          * @return void
 224          */
 225         function purge_feed($feed_id, $purge_interval, $debug = false) {
 226
 227                 if (!$purge_interval) $purge_interval = feed_purge_interval($feed_id);
 228
 229                 $pdo = Db::pdo();
 230
 231                 $sth = $pdo->prepare("SELECT owner_uid FROM ttrss_feeds WHERE id = ?");
 232                 $sth->execute([$feed_id]);
 233
 234                 $owner_uid = false;
 235
 236                 if ($row = $sth->fetch()) {
 237                         $owner_uid = $row["owner_uid"];
 238                 }
 239
 240                 if ($purge_interval == -1 || !$purge_interval) {
 241                         if ($owner_uid) {
 242                                 CCache::update($feed_id, $owner_uid);
 243                         }
 244                         return;
 245                 }
 246
 247                 if (!$owner_uid) return;
 248
 249                 if (FORCE_ARTICLE_PURGE == 0) {
 250                         $purge_unread = get_pref("PURGE_UNREAD_ARTICLES",
 251                                 $owner_uid, false);
 252                 } else {
 253                         $purge_unread = true;
 254                         $purge_interval = FORCE_ARTICLE_PURGE;
 255                 }
 256
 257                 if (!$purge_unread)
 258                     $query_limit = " unread = false AND ";
 259                 else
 260                     $query_limit = "";
 261
 262                 $purge_interval = (int) $purge_interval;
 263
 264                 if (DB_TYPE == "pgsql") {
 265                         $sth = $pdo->prepare("DELETE FROM ttrss_user_entries
 266                                 USING ttrss_entries
 267                                 WHERE ttrss_entries.id = ref_id AND
 268                                 marked = false AND
 269                                 feed_id = ? AND
 270                                 $query_limit
 271                                 ttrss_entries.date_updated < NOW() - INTERVAL '$purge_interval days'");
 272                         $sth->execute([$feed_id]);
 273
 274                 } else {
 275             $sth  = $pdo->prepare("DELETE FROM ttrss_user_entries
 276                                 USING ttrss_user_entries, ttrss_entries
 277                                 WHERE ttrss_entries.id = ref_id AND
 278                                 marked = false AND
 279                                 feed_id = ? AND
 280                                 $query_limit
 281                                 ttrss_entries.date_updated < DATE_SUB(NOW(), INTERVAL $purge_interval DAY)");
 282             $sth->execute([$feed_id]);
 283
 284                 }
 285
 286                 $rows = $sth->rowCount();
 287
 288                 CCache::update($feed_id, $owner_uid);
 289
 290                 if ($debug) {
 291                         _debug("Purged feed $feed_id ($purge_interval): deleted $rows articles");
 292                 }
 293
 294                 return $rows;
 295         } // function purge_feed
 296
 297         function feed_purge_interval($feed_id) {
 298
 299             $pdo = DB::pdo();
 300
 301                 $sth = $pdo->prepare("SELECT purge_interval, owner_uid FROM ttrss_feeds
 302                         WHERE id = ?");
 303                 $sth->execute([$feed_id]);
 304
 305                 if ($row = $sth->fetch()) {
 306                         $purge_interval = $row["purge_interval"];
 307                         $owner_uid = $row["owner_uid"];
 308
 309                         if ($purge_interval == 0) $purge_interval = get_pref(
 310                                 'PURGE_OLD_DAYS', $owner_uid);
 311
 312                         return $purge_interval;
 313
 314                 } else {
 315                         return -1;
 316                 }
 317         }
 318
 319         // TODO: multiple-argument way is deprecated, first parameter is a hash now
 320         function fetch_file_contents($options /* previously: 0: $url , 1: $type = false, 2: $login = false, 3: $pass = false,
 321                                 4: $post_query = false, 5: $timeout = false, 6: $timestamp = 0, 7: $useragent = false*/) {
 322
 323                 global $fetch_last_error;
 324                 global $fetch_last_error_code;
 325                 global $fetch_last_error_content;
 326                 global $fetch_last_content_type;
 327                 global $fetch_last_modified;
 328                 global $fetch_curl_used;
 329
 330                 $fetch_last_error = false;
 331                 $fetch_last_error_code = -1;
 332                 $fetch_last_error_content = "";
 333                 $fetch_last_content_type = "";
 334                 $fetch_curl_used = false;
 335                 $fetch_last_modified = "";
 336
 337                 if (!is_array($options)) {
 338
 339                         // falling back on compatibility shim
 340                         $option_names = [ "url", "type", "login", "pass", "post_query", "timeout", "last_modified", "useragent" ];
 341                         $tmp = [];
 342
 343                         for ($i = 0; $i < func_num_args(); $i++) {
 344                                 $tmp[$option_names[$i]] = func_get_arg($i);
 345                         }
 346
 347                         $options = $tmp;
 348
 349                         /*$options = array(
 350                                         "url" => func_get_arg(0),
 351                                         "type" => @func_get_arg(1),
 352                                         "login" => @func_get_arg(2),
 353                                         "pass" => @func_get_arg(3),
 354                                         "post_query" => @func_get_arg(4),
 355                                         "timeout" => @func_get_arg(5),
 356                                         "timestamp" => @func_get_arg(6),
 357                                         "useragent" => @func_get_arg(7)
 358                         ); */
 359                 }
 360
 361                 $url = $options["url"];
 362                 $type = isset($options["type"]) ? $options["type"] : false;
 363                 $login = isset($options["login"]) ? $options["login"] : false;
 364                 $pass = isset($options["pass"]) ? $options["pass"] : false;
 365                 $post_query = isset($options["post_query"]) ? $options["post_query"] : false;
 366                 $timeout = isset($options["timeout"]) ? $options["timeout"] : false;
 367                 $last_modified = isset($options["last_modified"]) ? $options["last_modified"] : "";
 368                 $useragent = isset($options["useragent"]) ? $options["useragent"] : false;
 369                 $followlocation = isset($options["followlocation"]) ? $options["followlocation"] : true;
 370
 371                 $url = ltrim($url, ' ');
 372                 $url = str_replace(' ', '%20', $url);
 373
 374                 if (strpos($url, "//") === 0)
 375                         $url = 'http:' . $url;
 376
 377                 if (!defined('NO_CURL') && function_exists('curl_init') && !ini_get("open_basedir")) {
 378
 379                         $fetch_curl_used = true;
 380
 381                         $ch = curl_init($url);
 382
 383                         if ($last_modified && !$post_query) {
 384                                 curl_setopt($ch, CURLOPT_HTTPHEADER,
 385                                         array("If-Modified-Since: $last_modified"));
 386                         }
 387
 388                         curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout ? $timeout : FILE_FETCH_CONNECT_TIMEOUT);
 389                         curl_setopt($ch, CURLOPT_TIMEOUT, $timeout ? $timeout : FILE_FETCH_TIMEOUT);
 390                         curl_setopt($ch, CURLOPT_FOLLOWLOCATION, !ini_get("open_basedir") && $followlocation);
 391                         curl_setopt($ch, CURLOPT_MAXREDIRS, 20);
 392                         curl_setopt($ch, CURLOPT_BINARYTRANSFER, true);
 393                         curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
 394                         curl_setopt($ch, CURLOPT_HEADER, true);
 395                         curl_setopt($ch, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
 396                         curl_setopt($ch, CURLOPT_USERAGENT, $useragent ? $useragent :
 397                                 SELF_USER_AGENT);
 398                         curl_setopt($ch, CURLOPT_ENCODING, "");
 399                         //curl_setopt($ch, CURLOPT_REFERER, $url);
 400
 401                         if (!ini_get("open_basedir")) {
 402                                 curl_setopt($ch, CURLOPT_COOKIEJAR, "/dev/null");
 403                         }
 404
 405                         if (defined('_CURL_HTTP_PROXY')) {
 406                                 curl_setopt($ch, CURLOPT_PROXY, _CURL_HTTP_PROXY);
 407                         }
 408
 409                         if ($post_query) {
 410                                 curl_setopt($ch, CURLOPT_POST, true);
 411                                 curl_setopt($ch, CURLOPT_POSTFIELDS, $post_query);
 412                         }
 413
 414                         if ($login && $pass)
 415                                 curl_setopt($ch, CURLOPT_USERPWD, "$login:$pass");
 416
 417                         $ret = @curl_exec($ch);
 418
 419                         $headers_length = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
 420                         $headers = explode("\r\n", substr($ret, 0, $headers_length));
 421                         $contents = substr($ret, $headers_length);
 422
 423                         foreach ($headers as $header) {
 424                 if (strstr($header, ": ") !== FALSE) {
 425                     list ($key, $value) = explode(": ", $header);
 426
 427                     if (strtolower($key) == "last-modified") {
 428                         $fetch_last_modified = $value;
 429                     }
 430                 }
 431
 432                 if (substr(strtolower($header), 0, 7) == 'http/1.') {
 433                     $fetch_last_error_code = (int) substr($header, 9, 3);
 434                     $fetch_last_error = $header;
 435                 }
 436                         }
 437
 438                         if (curl_errno($ch) === 23 || curl_errno($ch) === 61) {
 439                                 curl_setopt($ch, CURLOPT_ENCODING, 'none');
 440                                 $contents = @curl_exec($ch);
 441                         }
 442
 443                         $http_code = curl_getinfo($ch, CURLINFO_HTTP_CODE);
 444                         $fetch_last_content_type = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
 445
 446                         $fetch_last_error_code = $http_code;
 447
 448                         if ($http_code != 200 || $type && strpos($fetch_last_content_type, "$type") === false) {
 449
 450                                 if (curl_errno($ch) != 0) {
 451                                         $fetch_last_error .=  "; " . curl_errno($ch) . " " . curl_error($ch);
 452                                 }
 453
 454                                 $fetch_last_error_content = $contents;
 455                                 curl_close($ch);
 456                                 return false;
 457                         }
 458
 459                         if (!$contents) {
 460                                 $fetch_last_error = curl_errno($ch) . " " . curl_error($ch);
 461                                 curl_close($ch);
 462                                 return false;
 463                         }
 464
 465                         curl_close($ch);
 466
 467                         return $contents;
 468                 } else {
 469
 470                         $fetch_curl_used = false;
 471
 472                         if ($login && $pass){
 473                                 $url_parts = array();
 474
 475                                 preg_match("/(^[^:]*):\/\/(.*)/", $url, $url_parts);
 476
 477                                 $pass = urlencode($pass);
 478
 479                                 if ($url_parts[1] && $url_parts[2]) {
 480                                         $url = $url_parts[1] . "://$login:$pass@" . $url_parts[2];
 481                                 }
 482                         }
 483
 484                         // TODO: should this support POST requests or not? idk
 485
 486                         if (!$post_query && $last_modified) {
 487                                  $context = stream_context_create(array(
 488                                           'http' => array(
 489                                                         'method' => 'GET',
 490                                                     'ignore_errors' => true,
 491                                                     'timeout' => $timeout ? $timeout : FILE_FETCH_TIMEOUT,
 492                                                         'protocol_version'=> 1.1,
 493                                                         'header' => "If-Modified-Since: $last_modified\r\n")
 494                                           ));
 495                         } else {
 496                                  $context = stream_context_create(array(
 497                                           'http' => array(
 498                                                         'method' => 'GET',
 499                                                     'ignore_errors' => true,
 500                                                     'timeout' => $timeout ? $timeout : FILE_FETCH_TIMEOUT,
 501                                                         'protocol_version'=> 1.1
 502                                           )));
 503                         }
 504
 505                         $old_error = error_get_last();
 506
 507                         $data = @file_get_contents($url, false, $context);
 508
 509                         if (isset($http_response_header) && is_array($http_response_header)) {
 510                                 foreach ($http_response_header as $header) {
 511                                     if (strstr($header, ": ") !== FALSE) {
 512                         list ($key, $value) = explode(": ", $header);
 513
 514                         $key = strtolower($key);
 515
 516                         if ($key == 'content-type') {
 517                             $fetch_last_content_type = $value;
 518                             // don't abort here b/c there might be more than one
 519                             // e.g. if we were being redirected -- last one is the right one
 520                         } else if ($key == 'last-modified') {
 521                             $fetch_last_modified = $value;
 522                         }
 523                     }
 524
 525                                         if (substr(strtolower($header), 0, 7) == 'http/1.') {
 526                                                 $fetch_last_error_code = (int) substr($header, 9, 3);
 527                                                 $fetch_last_error = $header;
 528                                         }
 529                                 }
 530                         }
 531
 532                         if ($fetch_last_error_code != 200) {
 533                                 $error = error_get_last();
 534
 535                                 if ($error['message'] != $old_error['message']) {
 536                                         $fetch_last_error .= "; " . $error["message"];
 537                                 }
 538
 539                                 $fetch_last_error_content = $data;
 540
 541                                 return false;
 542                         }
 543                         return $data;
 544                 }
 545
 546         }
 547
 548         /**
 549          * Try to determine the favicon URL for a feed.
 550          * adapted from wordpress favicon plugin by Jeff Minard (http://thecodepro.com/)
 551          * http://dev.wp-plugins.org/file/favatars/trunk/favatars.php
 552          *
 553          * @param string $url A feed or page URL
 554          * @access public
 555          * @return mixed The favicon URL, or false if none was found.
 556          */
 557         function get_favicon_url($url) {
 558
 559                 $favicon_url = false;
 560
 561                 if ($html = @fetch_file_contents($url)) {
 562
 563                         libxml_use_internal_errors(true);
 564
 565                         $doc = new DOMDocument();
 566                         $doc->loadHTML($html);
 567                         $xpath = new DOMXPath($doc);
 568
 569                         $base = $xpath->query('/html/head/base[@href]');
 570                         foreach ($base as $b) {
 571                                 $url = rewrite_relative_url($url, $b->getAttribute("href"));
 572                                 break;
 573                         }
 574
 575                         $entries = $xpath->query('/html/head/link[@rel="shortcut icon" or @rel="icon"]');
 576                         if (count($entries) > 0) {
 577                                 foreach ($entries as $entry) {
 578                                         $favicon_url = rewrite_relative_url($url, $entry->getAttribute("href"));
 579                                         break;
 580                                 }
 581                         }
 582                 }
 583
 584                 if (!$favicon_url)
 585                         $favicon_url = rewrite_relative_url($url, "/favicon.ico");
 586
 587                 return $favicon_url;
 588         } // function get_favicon_url
 589
 590         function initialize_user_prefs($uid, $profile = false) {
 591
 592                 if (get_schema_version() < 63) $profile_qpart = "";
 593
 594         $pdo = DB::pdo();
 595         $in_nested_tr = false;
 596
 597         try {
 598                         $pdo->beginTransaction();
 599                 } catch (Exception $e) {
 600                 $in_nested_tr = true;
 601                 }
 602
 603                 $sth = $pdo->query("SELECT pref_name,def_value FROM ttrss_prefs");
 604
 605         $profile = $profile ? $profile : null;
 606
 607                 $u_sth = $pdo->prepare("SELECT pref_name
 608                         FROM ttrss_user_prefs WHERE owner_uid = :uid AND
 609                                 (profile = :profile OR (:profile IS NULL AND profile IS NULL))");
 610                 $u_sth->execute([':uid' => $uid, ':profile' => $profile]);
 611
 612                 $active_prefs = array();
 613
 614                 while ($line = $u_sth->fetch()) {
 615                         array_push($active_prefs, $line["pref_name"]);
 616                 }
 617
 618                 while ($line = $sth->fetch()) {
 619                         if (array_search($line["pref_name"], $active_prefs) === FALSE) {
 620 //                              print "adding " . $line["pref_name"] . "<br>";
 621
 622                                 if (get_schema_version() < 63) {
 623                                         $i_sth = $pdo->prepare("INSERT INTO ttrss_user_prefs
 624                                                 (owner_uid,pref_name,value) VALUES
 625                                                 (?, ?, ?)");
 626                                         $i_sth->execute([$uid, $line["pref_name"], $line["def_value"]]);
 627
 628                                 } else {
 629                                         $i_sth = $pdo->prepare("INSERT INTO ttrss_user_prefs
 630                                                 (owner_uid,pref_name,value, profile) VALUES
 631                                                 (?, ?, ?, ?)");
 632                     $i_sth->execute([$uid, $line["pref_name"], $line["def_value"], $profile]);
 633                                 }
 634
 635                         }
 636                 }
 637
 638                 if (!$in_nested_tr) $pdo->commit();
 639
 640         }
 641
 642         function get_ssl_certificate_id() {
 643                 if ($_SERVER["REDIRECT_SSL_CLIENT_M_SERIAL"]) {
 644                         return sha1($_SERVER["REDIRECT_SSL_CLIENT_M_SERIAL"] .
 645                                 $_SERVER["REDIRECT_SSL_CLIENT_V_START"] .
 646                                 $_SERVER["REDIRECT_SSL_CLIENT_V_END"] .
 647                                 $_SERVER["REDIRECT_SSL_CLIENT_S_DN"]);
 648                 }
 649                 if ($_SERVER["SSL_CLIENT_M_SERIAL"]) {
 650                         return sha1($_SERVER["SSL_CLIENT_M_SERIAL"] .
 651                                 $_SERVER["SSL_CLIENT_V_START"] .
 652                                 $_SERVER["SSL_CLIENT_V_END"] .
 653                                 $_SERVER["SSL_CLIENT_S_DN"]);
 654                 }
 655                 return "";
 656         }
 657
 658         function authenticate_user($login, $password, $check_only = false) {
 659
 660                 if (!SINGLE_USER_MODE) {
 661                         $user_id = false;
 662
 663                         foreach (PluginHost::getInstance()->get_hooks(PluginHost::HOOK_AUTH_USER) as $plugin) {
 664
 665                                 $user_id = (int) $plugin->authenticate($login, $password);
 666
 667                                 if ($user_id) {
 668                                         $_SESSION["auth_module"] = strtolower(get_class($plugin));
 669                                         break;
 670                                 }
 671                         }
 672
 673                         if ($user_id && !$check_only) {
 674                                 @session_start();
 675
 676                                 $_SESSION["uid"] = $user_id;
 677                                 $_SESSION["version"] = VERSION_STATIC;
 678
 679                                 $pdo = DB::pdo();
 680                                 $sth = $pdo->prepare("SELECT login,access_level,pwd_hash FROM ttrss_users
 681                                         WHERE id = ?");
 682                                 $sth->execute([$user_id]);
 683                                 $row = $sth->fetch();
 684
 685                                 $_SESSION["name"] = $row["login"];
 686                                 $_SESSION["access_level"] = $row["access_level"];
 687                                 $_SESSION["csrf_token"] = uniqid_short();
 688
 689                                 $usth = $pdo->prepare("UPDATE ttrss_users SET last_login = NOW() WHERE id = ?");
 690                                 $usth->execute([$user_id]);
 691
 692                                 $_SESSION["ip_address"] = $_SERVER["REMOTE_ADDR"];
 693                                 $_SESSION["user_agent"] = sha1($_SERVER['HTTP_USER_AGENT']);
 694                                 $_SESSION["pwd_hash"] = $row["pwd_hash"];
 695
 696                                 $_SESSION["last_version_check"] = time();
 697
 698                                 initialize_user_prefs($_SESSION["uid"]);
 699
 700                                 return true;
 701                         }
 702
 703                         return false;
 704
 705                 } else {
 706
 707                         $_SESSION["uid"] = 1;
 708                         $_SESSION["name"] = "admin";
 709                         $_SESSION["access_level"] = 10;
 710
 711                         $_SESSION["hide_hello"] = true;
 712                         $_SESSION["hide_logout"] = true;
 713
 714                         $_SESSION["auth_module"] = false;
 715
 716                         if (!$_SESSION["csrf_token"]) {
 717                                 $_SESSION["csrf_token"] = uniqid_short();
 718                         }
 719
 720                         $_SESSION["ip_address"] = $_SERVER["REMOTE_ADDR"];
 721
 722                         initialize_user_prefs($_SESSION["uid"]);
 723
 724                         return true;
 725                 }
 726         }
 727
 728         // this is used for user http parameters unless HTML code is actually needed
 729         function clean($param) {
 730                 if (is_array($param)) {
 731                         return array_map("strip_tags", $param);
 732                 } else if (is_string($param)) {
 733                         return strip_tags($param);
 734                 } else {
 735                         return $param;
 736                 }
 737         }
 738
 739         function make_password($length = 8) {
 740
 741                 $password = "";
 742                 $possible = "0123456789abcdfghjkmnpqrstvwxyzABCDFGHJKMNPQRSTVWXYZ";
 743
 744         $i = 0;
 745
 746                 while ($i < $length) {
 747                         $char = substr($possible, mt_rand(0, strlen($possible)-1), 1);
 748
 749                         if (!strstr($password, $char)) {
 750                                 $password .= $char;
 751                                 $i++;
 752                         }
 753                 }
 754                 return $password;
 755         }
 756
 757         // this is called after user is created to initialize default feeds, labels
 758         // or whatever else
 759
 760         // user preferences are checked on every login, not here
 761
 762         function initialize_user($uid) {
 763
 764             $pdo = DB::pdo();
 765
 766                 $sth = $pdo->prepare("insert into ttrss_feeds (owner_uid,title,feed_url)
 767                         values (?, 'Tiny Tiny RSS: Forum',
 768                                 'http://tt-rss.org/forum/rss.php')");
 769                 $sth->execute([$uid]);
 770         }
 771
 772         function logout_user() {
 773                 session_destroy();
 774                 if (isset($_COOKIE[session_name()])) {
 775                    setcookie(session_name(), '', time()-42000, '/');
 776                 }
 777         }
 778
 779         function validate_csrf($csrf_token) {
 780                 return $csrf_token == $_SESSION['csrf_token'];
 781         }
 782
 783         function load_user_plugins($owner_uid, $pluginhost = false) {
 784
 785                 if (!$pluginhost) $pluginhost = PluginHost::getInstance();
 786
 787                 if ($owner_uid && SCHEMA_VERSION >= 100) {
 788                         $plugins = get_pref("_ENABLED_PLUGINS", $owner_uid);
 789
 790                         $pluginhost->load($plugins, PluginHost::KIND_USER, $owner_uid);
 791
 792                         if (get_schema_version() > 100) {
 793                                 $pluginhost->load_data();
 794                         }
 795                 }
 796         }
 797
 798         function login_sequence() {
 799         $pdo = Db::pdo();
 800
 801                 if (SINGLE_USER_MODE) {
 802                         @session_start();
 803                         authenticate_user("admin", null);
 804                         startup_gettext();
 805                         load_user_plugins($_SESSION["uid"]);
 806                 } else {
 807                         if (!validate_session()) $_SESSION["uid"] = false;
 808
 809                         if (!$_SESSION["uid"]) {
 810
 811                                 if (AUTH_AUTO_LOGIN && authenticate_user(null, null)) {
 812                                     $_SESSION["ref_schema_version"] = get_schema_version(true);
 813                                 } else {
 814                                          authenticate_user(null, null, true);
 815                                 }
 816
 817                                 if (!$_SESSION["uid"]) {
 818                                         @session_destroy();
 819                                         setcookie(session_name(), '', time()-42000, '/');
 820
 821                                         render_login_form();
 822                                         exit;
 823                                 }
 824
 825                         } else {
 826                                 /* bump login timestamp */
 827                                 $sth = $pdo->prepare("UPDATE ttrss_users SET last_login = NOW() WHERE id = ?");
 828                                 $sth->execute([$_SESSION['uid']]);
 829
 830                                 $_SESSION["last_login_update"] = time();
 831                         }
 832
 833                         if ($_SESSION["uid"]) {
 834                                 startup_gettext();
 835                                 load_user_plugins($_SESSION["uid"]);
 836
 837                                 /* cleanup ccache */
 838
 839                                 $sth = $pdo->prepare("DELETE FROM ttrss_counters_cache WHERE owner_uid = ?
 840                     AND
 841                                                 (SELECT COUNT(id) FROM ttrss_feeds WHERE
 842                                                         ttrss_feeds.id = feed_id) = 0");
 843
 844                                 $sth->execute([$_SESSION['uid']]);
 845
 846                                 $sth = $pdo->prepare("DELETE FROM ttrss_cat_counters_cache WHERE owner_uid = ?
 847                     AND
 848                                                 (SELECT COUNT(id) FROM ttrss_feed_categories WHERE
 849                                                         ttrss_feed_categories.id = feed_id) = 0");
 850
 851                 $sth->execute([$_SESSION['uid']]);
 852                         }
 853
 854                 }
 855         }
 856
 857         function truncate_string($str, $max_len, $suffix = '&hellip;') {
 858                 if (mb_strlen($str, "utf-8") > $max_len) {
 859                         return mb_substr($str, 0, $max_len, "utf-8") . $suffix;
 860                 } else {
 861                         return $str;
 862                 }
 863         }
 864
 865         // is not utf8 clean
 866         function truncate_middle($str, $max_len, $suffix = '&hellip;') {
 867                 if (strlen($str) > $max_len) {
 868                         return substr_replace($str, $suffix, $max_len / 2, mb_strlen($str) - $max_len);
 869                 } else {
 870                         return $str;
 871                 }
 872         }
 873
 874         function convert_timestamp($timestamp, $source_tz, $dest_tz) {
 875
 876                 try {
 877                         $source_tz = new DateTimeZone($source_tz);
 878                 } catch (Exception $e) {
 879                         $source_tz = new DateTimeZone('UTC');
 880                 }
 881
 882                 try {
 883                         $dest_tz = new DateTimeZone($dest_tz);
 884                 } catch (Exception $e) {
 885                         $dest_tz = new DateTimeZone('UTC');
 886                 }
 887
 888                 $dt = new DateTime(date('Y-m-d H:i:s', $timestamp), $source_tz);
 889                 return $dt->format('U') + $dest_tz->getOffset($dt);
 890         }
 891
 892         function make_local_datetime($timestamp, $long, $owner_uid = false,
 893                                         $no_smart_dt = false, $eta_min = false) {
 894
 895                 if (!$owner_uid) $owner_uid = $_SESSION['uid'];
 896                 if (!$timestamp) $timestamp = '1970-01-01 0:00';
 897
 898                 global $utc_tz;
 899                 global $user_tz;
 900
 901                 if (!$utc_tz) $utc_tz = new DateTimeZone('UTC');
 902
 903                 $timestamp = substr($timestamp, 0, 19);
 904
 905                 # We store date in UTC internally
 906                 $dt = new DateTime($timestamp, $utc_tz);
 907
 908                 $user_tz_string = get_pref('USER_TIMEZONE', $owner_uid);
 909
 910                 if ($user_tz_string != 'Automatic') {
 911
 912                         try {
 913                                 if (!$user_tz) $user_tz = new DateTimeZone($user_tz_string);
 914                         } catch (Exception $e) {
 915                                 $user_tz = $utc_tz;
 916                         }
 917
 918                         $tz_offset = $user_tz->getOffset($dt);
 919                 } else {
 920                         $tz_offset = (int) -$_SESSION["clientTzOffset"];
 921                 }
 922
 923                 $user_timestamp = $dt->format('U') + $tz_offset;
 924
 925                 if (!$no_smart_dt) {
 926                         return smart_date_time($user_timestamp,
 927                                 $tz_offset, $owner_uid, $eta_min);
 928                 } else {
 929                         if ($long)
 930                                 $format = get_pref('LONG_DATE_FORMAT', $owner_uid);
 931                         else
 932                                 $format = get_pref('SHORT_DATE_FORMAT', $owner_uid);
 933
 934                         return date($format, $user_timestamp);
 935                 }
 936         }
 937
 938         function smart_date_time($timestamp, $tz_offset = 0, $owner_uid = false, $eta_min = false) {
 939                 if (!$owner_uid) $owner_uid = $_SESSION['uid'];
 940
 941                 if ($eta_min && time() + $tz_offset - $timestamp < 3600) {
 942                         return T_sprintf("%d min", date("i", time() + $tz_offset - $timestamp));
 943                 } else if (date("Y.m.d", $timestamp) == date("Y.m.d", time() + $tz_offset)) {
 944                         return date("G:i", $timestamp);
 945                 } else if (date("Y", $timestamp) == date("Y", time() + $tz_offset)) {
 946                         $format = get_pref('SHORT_DATE_FORMAT', $owner_uid);
 947                         return date($format, $timestamp);
 948                 } else {
 949                         $format = get_pref('LONG_DATE_FORMAT', $owner_uid);
 950                         return date($format, $timestamp);
 951                 }
 952         }
 953
 954         function sql_bool_to_bool($s) {
 955                 return $s && ($s !== "f" && $s !== "false"); //no-op for PDO, backwards compat for legacy layer
 956         }
 957
 958         function bool_to_sql_bool($s) {
 959                 return $s ? 1 : 0;
 960         }
 961
 962         // Session caching removed due to causing wrong redirects to upgrade
 963         // script when get_schema_version() is called on an obsolete session
 964         // created on a previous schema version.
 965         function get_schema_version($nocache = false) {
 966                 global $schema_version;
 967
 968                 $pdo = DB::pdo();
 969
 970                 if (!$schema_version && !$nocache) {
 971                         $row = $pdo->query("SELECT schema_version FROM ttrss_version")->fetch();
 972                         $version = $row["schema_version"];
 973                         $schema_version = $version;
 974                         return $version;
 975                 } else {
 976                         return $schema_version;
 977                 }
 978         }
 979
 980         function sanity_check() {
 981                 require_once 'errors.php';
 982                 global $ERRORS;
 983
 984                 $error_code = 0;
 985                 $schema_version = get_schema_version(true);
 986
 987                 if ($schema_version != SCHEMA_VERSION) {
 988                         $error_code = 5;
 989                 }
 990
 991                 return array("code" => $error_code, "message" => $ERRORS[$error_code]);
 992         }
 993
 994         function file_is_locked($filename) {
 995                 if (file_exists(LOCK_DIRECTORY . "/$filename")) {
 996                         if (function_exists('flock')) {
 997                                 $fp = @fopen(LOCK_DIRECTORY . "/$filename", "r");
 998                                 if ($fp) {
 999                                         if (flock($fp, LOCK_EX | LOCK_NB)) {
1000                                                 flock($fp, LOCK_UN);
1001                                                 fclose($fp);
1002                                                 return false;
1003                                         }
1004                                         fclose($fp);
1005                                         return true;
1006                                 } else {
1007                                         return false;
1008                                 }
1009                         }
1010                         return true; // consider the file always locked and skip the test
1011                 } else {
1012                         return false;
1013                 }
1014         }
1015
1016
1017         function make_lockfile($filename) {
1018                 $fp = fopen(LOCK_DIRECTORY . "/$filename", "w");
1019
1020                 if ($fp && flock($fp, LOCK_EX | LOCK_NB)) {
1021                         $stat_h = fstat($fp);
1022                         $stat_f = stat(LOCK_DIRECTORY . "/$filename");
1023
1024                         if (strtoupper(substr(PHP_OS, 0, 3)) !== 'WIN') {
1025                                 if ($stat_h["ino"] != $stat_f["ino"] ||
1026                                                 $stat_h["dev"] != $stat_f["dev"]) {
1027
1028                                         return false;
1029                                 }
1030                         }
1031
1032                         if (function_exists('posix_getpid')) {
1033                                 fwrite($fp, posix_getpid() . "\n");
1034                         }
1035                         return $fp;
1036                 } else {
1037                         return false;
1038                 }
1039         }
1040
1041         function make_stampfile($filename) {
1042                 $fp = fopen(LOCK_DIRECTORY . "/$filename", "w");
1043
1044                 if (flock($fp, LOCK_EX | LOCK_NB)) {
1045                         fwrite($fp, time() . "\n");
1046                         flock($fp, LOCK_UN);
1047                         fclose($fp);
1048                         return true;
1049                 } else {
1050                         return false;
1051                 }
1052         }
1053
1054         function sql_random_function() {
1055                 if (DB_TYPE == "mysql") {
1056                         return "RAND()";
1057                 } else {
1058                         return "RANDOM()";
1059                 }
1060         }
1061
1062         function getFeedUnread($feed, $is_cat = false) {
1063                 return Feeds::getFeedArticles($feed, $is_cat, true, $_SESSION["uid"]);
1064         }
1065
1066         function checkbox_to_sql_bool($val) {
1067                 return ($val == "on") ? 1 : 0;
1068         }
1069
1070         function uniqid_short() {
1071                 return uniqid(base_convert(rand(), 10, 36));
1072         }
1073
1074         function make_init_params() {
1075                 $params = array();
1076
1077                 foreach (array("ON_CATCHUP_SHOW_NEXT_FEED", "HIDE_READ_FEEDS",
1078                                          "ENABLE_FEED_CATS", "FEEDS_SORT_BY_UNREAD", "CONFIRM_FEED_CATCHUP",
1079                                          "CDM_AUTO_CATCHUP", "FRESH_ARTICLE_MAX_AGE",
1080                                          "HIDE_READ_SHOWS_SPECIAL", "COMBINED_DISPLAY_MODE") as $param) {
1081
1082                         $params[strtolower($param)] = (int) get_pref($param);
1083                 }
1084
1085                 $params["icons_url"] = ICONS_URL;
1086                 $params["cookie_lifetime"] = SESSION_COOKIE_LIFETIME;
1087                 $params["default_view_mode"] = get_pref("_DEFAULT_VIEW_MODE");
1088                 $params["default_view_limit"] = (int) get_pref("_DEFAULT_VIEW_LIMIT");
1089                 $params["default_view_order_by"] = get_pref("_DEFAULT_VIEW_ORDER_BY");
1090                 $params["bw_limit"] = (int) $_SESSION["bw_limit"];
1091                 $params["is_default_pw"] = Pref_Prefs::isdefaultpassword();
1092                 $params["label_base_index"] = (int) LABEL_BASE_INDEX;
1093
1094                 $theme = get_pref( "USER_CSS_THEME", false, false);
1095                 $params["theme"] = theme_valid("$theme") ? $theme : "";
1096
1097                 $params["plugins"] = implode(", ", PluginHost::getInstance()->get_plugin_names());
1098
1099                 $params["php_platform"] = PHP_OS;
1100                 $params["php_version"] = PHP_VERSION;
1101
1102                 $params["sanity_checksum"] = sha1(file_get_contents("include/sanity_check.php"));
1103
1104                 $pdo = Db::pdo();
1105
1106                 $sth = $pdo->prepare("SELECT MAX(id) AS mid, COUNT(*) AS nf FROM
1107                                 ttrss_feeds WHERE owner_uid = ?");
1108                 $sth->execute([$_SESSION['uid']]);
1109                 $row = $sth->fetch();
1110
1111                 $max_feed_id = $row["mid"];
1112                 $num_feeds = $row["nf"];
1113
1114                 $params["max_feed_id"] = (int) $max_feed_id;
1115                 $params["num_feeds"] = (int) $num_feeds;
1116
1117                 $params["hotkeys"] = get_hotkeys_map();
1118
1119                 $params["csrf_token"] = $_SESSION["csrf_token"];
1120                 $params["widescreen"] = (int) $_COOKIE["ttrss_widescreen"];
1121
1122                 $params['simple_update'] = defined('SIMPLE_UPDATE_MODE') && SIMPLE_UPDATE_MODE;
1123
1124                 $params["icon_alert"] = base64_img("images/alert.png");
1125                 $params["icon_information"] = base64_img("images/information.png");
1126                 $params["icon_cross"] = base64_img("images/cross.png");
1127                 $params["icon_indicator_white"] = base64_img("images/indicator_white.gif");
1128
1129                 $params["labels"] = Labels::get_all_labels($_SESSION["uid"]);
1130
1131                 return $params;
1132         }
1133
1134         function get_hotkeys_info() {
1135                 $hotkeys = array(
1136                         __("Navigation") => array(
1137                                 "next_feed" => __("Open next feed"),
1138                                 "prev_feed" => __("Open previous feed"),
1139                                 "next_article" => __("Open next article"),
1140                                 "prev_article" => __("Open previous article"),
1141                                 "next_article_noscroll" => __("Open next article (don't scroll long articles)"),
1142                                 "prev_article_noscroll" => __("Open previous article (don't scroll long articles)"),
1143                                 "next_article_noexpand" => __("Move to next article (don't expand or mark read)"),
1144                                 "prev_article_noexpand" => __("Move to previous article (don't expand or mark read)"),
1145                                 "search_dialog" => __("Show search dialog")),
1146                         __("Article") => array(
1147                                 "toggle_mark" => __("Toggle starred"),
1148                                 "toggle_publ" => __("Toggle published"),
1149                                 "toggle_unread" => __("Toggle unread"),
1150                                 "edit_tags" => __("Edit tags"),
1151                                 "open_in_new_window" => __("Open in new window"),
1152                                 "catchup_below" => __("Mark below as read"),
1153                                 "catchup_above" => __("Mark above as read"),
1154                                 "article_scroll_down" => __("Scroll down"),
1155                                 "article_scroll_up" => __("Scroll up"),
1156                                 "select_article_cursor" => __("Select article under cursor"),
1157                                 "email_article" => __("Email article"),
1158                                 "close_article" => __("Close/collapse article"),
1159                                 "toggle_expand" => __("Toggle article expansion (combined mode)"),
1160                                 "toggle_widescreen" => __("Toggle widescreen mode"),
1161                                 "toggle_embed_original" => __("Toggle embed original")),
1162                         __("Article selection") => array(
1163                                 "select_all" => __("Select all articles"),
1164                                 "select_unread" => __("Select unread"),
1165                                 "select_marked" => __("Select starred"),
1166                                 "select_published" => __("Select published"),
1167                                 "select_invert" => __("Invert selection"),
1168                                 "select_none" => __("Deselect everything")),
1169                         __("Feed") => array(
1170                                 "feed_refresh" => __("Refresh current feed"),
1171                                 "feed_unhide_read" => __("Un/hide read feeds"),
1172                                 "feed_subscribe" => __("Subscribe to feed"),
1173                                 "feed_edit" => __("Edit feed"),
1174                                 "feed_catchup" => __("Mark as read"),
1175                                 "feed_reverse" => __("Reverse headlines"),
1176                                 "feed_toggle_vgroup" => __("Toggle headline grouping"),
1177                                 "feed_debug_update" => __("Debug feed update"),
1178                                 "feed_debug_viewfeed" => __("Debug viewfeed()"),
1179                                 "catchup_all" => __("Mark all feeds as read"),
1180                                 "cat_toggle_collapse" => __("Un/collapse current category"),
1181                                 "toggle_combined_mode" => __("Toggle combined mode"),
1182                                 "toggle_cdm_expanded" => __("Toggle auto expand in combined mode")),
1183                         __("Go to") => array(
1184                                 "goto_all" => __("All articles"),
1185                                 "goto_fresh" => __("Fresh"),
1186                                 "goto_marked" => __("Starred"),
1187                                 "goto_published" => __("Published"),
1188                                 "goto_tagcloud" => __("Tag cloud"),
1189                                 "goto_prefs" => __("Preferences")),
1190                         __("Other") => array(
1191                                 "create_label" => __("Create label"),
1192                                 "create_filter" => __("Create filter"),
1193                                 "collapse_sidebar" => __("Un/collapse sidebar"),
1194                                 "help_dialog" => __("Show help dialog"))
1195                 );
1196
1197                 foreach (PluginHost::getInstance()->get_hooks(PluginHost::HOOK_HOTKEY_INFO) as $plugin) {
1198                         $hotkeys = $plugin->hook_hotkey_info($hotkeys);
1199                 }
1200
1201                 return $hotkeys;
1202         }
1203
1204         function get_hotkeys_map() {
1205                 $hotkeys = array(
1206         //                      "navigation" => array(
1207                         "k" => "next_feed",
1208                         "j" => "prev_feed",
1209                         "n" => "next_article",
1210                         "p" => "prev_article",
1211                         "(38)|up" => "prev_article",
1212                         "(40)|down" => "next_article",
1213         //                              "^(38)|Ctrl-up" => "prev_article_noscroll",
1214         //                              "^(40)|Ctrl-down" => "next_article_noscroll",
1215                         "(191)|/" => "search_dialog",
1216         //                      "article" => array(
1217                         "s" => "toggle_mark",
1218                         "*s" => "toggle_publ",
1219                         "u" => "toggle_unread",
1220                         "*t" => "edit_tags",
1221                         "o" => "open_in_new_window",
1222                         "c p" => "catchup_below",
1223                         "c n" => "catchup_above",
1224                         "*n" => "article_scroll_down",
1225                         "*p" => "article_scroll_up",
1226                         "*(38)|Shift+up" => "article_scroll_up",
1227                         "*(40)|Shift+down" => "article_scroll_down",
1228                         "a *w" => "toggle_widescreen",
1229                         "a e" => "toggle_embed_original",
1230                         "e" => "email_article",
1231                         "a q" => "close_article",
1232         //                      "article_selection" => array(
1233                         "a a" => "select_all",
1234                         "a u" => "select_unread",
1235                         "a *u" => "select_marked",
1236                         "a p" => "select_published",
1237                         "a i" => "select_invert",
1238                         "a n" => "select_none",
1239         //                      "feed" => array(
1240                         "f r" => "feed_refresh",
1241                         "f a" => "feed_unhide_read",
1242                         "f s" => "feed_subscribe",
1243                         "f e" => "feed_edit",
1244                         "f q" => "feed_catchup",
1245                         "f x" => "feed_reverse",
1246                         "f g" => "feed_toggle_vgroup",
1247                         "f *d" => "feed_debug_update",
1248                         "f *g" => "feed_debug_viewfeed",
1249                         "f *c" => "toggle_combined_mode",
1250                         "f c" => "toggle_cdm_expanded",
1251                         "*q" => "catchup_all",
1252                         "x" => "cat_toggle_collapse",
1253         //                      "goto" => array(
1254                         "g a" => "goto_all",
1255                         "g f" => "goto_fresh",
1256                         "g s" => "goto_marked",
1257                         "g p" => "goto_published",
1258                         "g t" => "goto_tagcloud",
1259                         "g *p" => "goto_prefs",
1260         //                      "other" => array(
1261                         "(9)|Tab" => "select_article_cursor", // tab
1262                         "c l" => "create_label",
1263                         "c f" => "create_filter",
1264                         "c s" => "collapse_sidebar",
1265                         "^(191)|Ctrl+/" => "help_dialog",
1266                 );
1267
1268                 if (get_pref('COMBINED_DISPLAY_MODE')) {
1269                         $hotkeys["^(38)|Ctrl-up"] = "prev_article_noscroll";
1270                         $hotkeys["^(40)|Ctrl-down"] = "next_article_noscroll";
1271                 }
1272
1273                 foreach (PluginHost::getInstance()->get_hooks(PluginHost::HOOK_HOTKEY_MAP) as $plugin) {
1274                         $hotkeys = $plugin->hook_hotkey_map($hotkeys);
1275                 }
1276
1277                 $prefixes = array();
1278
1279                 foreach (array_keys($hotkeys) as $hotkey) {
1280                         $pair = explode(" ", $hotkey, 2);
1281
1282                         if (count($pair) > 1 && !in_array($pair[0], $prefixes)) {
1283                                 array_push($prefixes, $pair[0]);
1284                         }
1285                 }
1286
1287                 return array($prefixes, $hotkeys);
1288         }
1289
1290         function check_for_update() {
1291                 if (defined("GIT_VERSION_TIMESTAMP")) {
1292                         $content = @fetch_file_contents(array("url" => "http://tt-rss.org/version.json", "timeout" => 5));
1293
1294                         if ($content) {
1295                                 $content = json_decode($content, true);
1296
1297                                 if ($content && isset($content["changeset"])) {
1298                                         if ((int)GIT_VERSION_TIMESTAMP < (int)$content["changeset"]["timestamp"] &&
1299                                                 GIT_VERSION_HEAD != $content["changeset"]["id"]) {
1300
1301                                                 return $content["changeset"]["id"];
1302                                         }
1303                                 }
1304                         }
1305                 }
1306
1307                 return "";
1308         }
1309
1310         function make_runtime_info($disable_update_check = false) {
1311                 $data = array();
1312
1313                 $pdo = Db::pdo();
1314
1315                 $sth = $pdo->prepare("SELECT MAX(id) AS mid, COUNT(*) AS nf FROM
1316                                 ttrss_feeds WHERE owner_uid = ?");
1317                 $sth->execute([$_SESSION['uid']]);
1318                 $row = $sth->fetch();
1319
1320                 $max_feed_id = $row['mid'];
1321                 $num_feeds = $row['nf'];
1322
1323                 $data["max_feed_id"] = (int) $max_feed_id;
1324                 $data["num_feeds"] = (int) $num_feeds;
1325
1326                 $data['last_article_id'] = Article::getLastArticleId();
1327                 $data['cdm_expanded'] = get_pref('CDM_EXPANDED');
1328
1329                 $data['dep_ts'] = calculate_dep_timestamp();
1330                 $data['reload_on_ts_change'] = !defined('_NO_RELOAD_ON_TS_CHANGE');
1331
1332                 $data["labels"] = Labels::get_all_labels($_SESSION["uid"]);
1333
1334                 if (CHECK_FOR_UPDATES && !$disable_update_check && $_SESSION["last_version_check"] + 86400 + rand(-1000, 1000) < time()) {
1335                         $update_result = @check_for_update();
1336
1337                         $data["update_result"] = $update_result;
1338
1339                         $_SESSION["last_version_check"] = time();
1340                 }
1341
1342                 if (file_exists(LOCK_DIRECTORY . "/update_daemon.lock")) {
1343
1344                         $data['daemon_is_running'] = (int) file_is_locked("update_daemon.lock");
1345
1346                         if (time() - $_SESSION["daemon_stamp_check"] > 30) {
1347
1348                                 $stamp = (int) @file_get_contents(LOCK_DIRECTORY . "/update_daemon.stamp");
1349
1350                                 if ($stamp) {
1351                                         $stamp_delta = time() - $stamp;
1352
1353                                         if ($stamp_delta > 1800) {
1354                                                 $stamp_check = 0;
1355                                         } else {
1356                                                 $stamp_check = 1;
1357                                                 $_SESSION["daemon_stamp_check"] = time();
1358                                         }
1359
1360                                         $data['daemon_stamp_ok'] = $stamp_check;
1361
1362                                         $stamp_fmt = date("Y.m.d, G:i", $stamp);
1363
1364                                         $data['daemon_stamp'] = $stamp_fmt;
1365                                 }
1366                         }
1367                 }
1368
1369                 return $data;
1370         }
1371
1372         function search_to_sql($search, $search_language) {
1373
1374                 $keywords = str_getcsv(trim($search), " ");
1375                 $query_keywords = array();
1376                 $search_words = array();
1377                 $search_query_leftover = array();
1378
1379                 $pdo = Db::pdo();
1380
1381                 if ($search_language)
1382                         $search_language = $pdo->quote(mb_strtolower($search_language));
1383                 else
1384                         $search_language = $pdo->quote("english");
1385
1386                 foreach ($keywords as $k) {
1387                         if (strpos($k, "-") === 0) {
1388                                 $k = substr($k, 1);
1389                                 $not = "NOT";
1390                         } else {
1391                                 $not = "";
1392                         }
1393
1394                         $commandpair = explode(":", mb_strtolower($k), 2);
1395
1396                         switch ($commandpair[0]) {
1397                                 case "title":
1398                                         if ($commandpair[1]) {
1399                                                 array_push($query_keywords, "($not (LOWER(ttrss_entries.title) LIKE ".
1400                                                         $pdo->quote('%' . mb_strtolower($commandpair[1]) . '%') ."))");
1401                                         } else {
1402                                                 array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER('%$k%')
1403                                                                 OR UPPER(ttrss_entries.content) $not LIKE UPPER(".$pdo->quote("%$k%")."))");
1404                                                 array_push($search_words, $k);
1405                                         }
1406                                         break;
1407                                 case "author":
1408                                         if ($commandpair[1]) {
1409                                                 array_push($query_keywords, "($not (LOWER(author) LIKE ".
1410                                                         $pdo->quote('%' . mb_strtolower($commandpair[1]) . '%')."))");
1411                                         } else {
1412                                                 array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER('%$k%')
1413                                                                 OR UPPER(ttrss_entries.content) $not LIKE UPPER(".$pdo->quote("%$k%")."))");
1414                                                 array_push($search_words, $k);
1415                                         }
1416                                         break;
1417                                 case "note":
1418                                         if ($commandpair[1]) {
1419                                                 if ($commandpair[1] == "true")
1420                                                         array_push($query_keywords, "($not (note IS NOT NULL AND note != ''))");
1421                                                 else if ($commandpair[1] == "false")
1422                                                         array_push($query_keywords, "($not (note IS NULL OR note = ''))");
1423                                                 else
1424                                                         array_push($query_keywords, "($not (LOWER(note) LIKE ".
1425                                                                 $pdo->quote('%' . mb_strtolower($commandpair[1]) . '%')."))");
1426                                         } else {
1427                                                 array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER(".$pdo->quote("%$k%").")
1428                                                                 OR UPPER(ttrss_entries.content) $not LIKE UPPER(".$pdo->quote("%$k%")."))");
1429                                                 if (!$not) array_push($search_words, $k);
1430                                         }
1431                                         break;
1432                                 case "star":
1433
1434                                         if ($commandpair[1]) {
1435                                                 if ($commandpair[1] == "true")
1436                                                         array_push($query_keywords, "($not (marked = true))");
1437                                                 else
1438                                                         array_push($query_keywords, "($not (marked = false))");
1439                                         } else {
1440                                                 array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER(".$pdo->quote("%$k%").")
1441                                                                 OR UPPER(ttrss_entries.content) $not LIKE UPPER(".$pdo->quote("%$k%")."))");
1442                                                 if (!$not) array_push($search_words, $k);
1443                                         }
1444                                         break;
1445                                 case "pub":
1446                                         if ($commandpair[1]) {
1447                                                 if ($commandpair[1] == "true")
1448                                                         array_push($query_keywords, "($not (published = true))");
1449                                                 else
1450                                                         array_push($query_keywords, "($not (published = false))");
1451
1452                                         } else {
1453                                                 array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER('%$k%')
1454                                                                 OR UPPER(ttrss_entries.content) $not LIKE UPPER(".$pdo->quote("%$k%")."))");
1455                                                 if (!$not) array_push($search_words, $k);
1456                                         }
1457                                         break;
1458                                 case "unread":
1459                                         if ($commandpair[1]) {
1460                                                 if ($commandpair[1] == "true")
1461                                                         array_push($query_keywords, "($not (unread = true))");
1462                                                 else
1463                                                         array_push($query_keywords, "($not (unread = false))");
1464
1465                                         } else {
1466                                                 array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER(".$pdo->quote("%$k%").")
1467                                                                 OR UPPER(ttrss_entries.content) $not LIKE UPPER(".$pdo->quote("%$k%")."))");
1468                                                 if (!$not) array_push($search_words, $k);
1469                                         }
1470                                         break;
1471                                 default:
1472                                         if (strpos($k, "@") === 0) {
1473
1474                                                 $user_tz_string = get_pref('USER_TIMEZONE', $_SESSION['uid']);
1475                                                 $orig_ts = strtotime(substr($k, 1));
1476                                                 $k = date("Y-m-d", convert_timestamp($orig_ts, $user_tz_string, 'UTC'));
1477
1478                                                 //$k = date("Y-m-d", strtotime(substr($k, 1)));
1479
1480                                                 array_push($query_keywords, "(".SUBSTRING_FOR_DATE."(updated,1,LENGTH('$k')) $not = '$k')");
1481                                         } else {
1482
1483                                                 if (DB_TYPE == "pgsql") {
1484                                                         $k = mb_strtolower($k);
1485                                                         array_push($search_query_leftover, $not ? "!$k" : $k);
1486                                                 } else {
1487                                                         array_push($query_keywords, "(UPPER(ttrss_entries.title) $not LIKE UPPER(".$pdo->quote("%$k%").")
1488                                                                 OR UPPER(ttrss_entries.content) $not LIKE UPPER(".$pdo->quote("%$k%")."))");
1489                                                 }
1490
1491                                                 if (!$not) array_push($search_words, $k);
1492                                         }
1493                         }
1494                 }
1495
1496                 if (count($search_query_leftover) > 0) {
1497                         $search_query_leftover = $pdo->quote(implode(" & ", $search_query_leftover));
1498
1499                         if (DB_TYPE == "pgsql") {
1500                                 array_push($query_keywords,
1501                                         "(tsvector_combined @@ to_tsquery($search_language, $search_query_leftover))");
1502                         }
1503
1504                 }
1505
1506                 $search_query_part = implode("AND", $query_keywords);
1507
1508                 return array($search_query_part, $search_words);
1509         }
1510
1511         function iframe_whitelisted($entry) {
1512                 $whitelist = array("youtube.com", "youtu.be", "vimeo.com", "player.vimeo.com");
1513
1514                 @$src = parse_url($entry->getAttribute("src"), PHP_URL_HOST);
1515
1516                 if ($src) {
1517                         foreach ($whitelist as $w) {
1518                                 if ($src == $w || $src == "www.$w")
1519                                         return true;
1520                         }
1521                 }
1522
1523                 return false;
1524         }
1525
1526         function sanitize($str, $force_remove_images = false, $owner = false, $site_url = false, $highlight_words = false, $article_id = false) {
1527                 if (!$owner) $owner = $_SESSION["uid"];
1528
1529                 $res = trim($str); if (!$res) return '';
1530
1531                 $charset_hack = '<head>
1532                                 <meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
1533                         </head>';
1534
1535                 $res = trim($res); if (!$res) return '';
1536
1537                 libxml_use_internal_errors(true);
1538
1539                 $doc = new DOMDocument();
1540                 $doc->loadHTML($charset_hack . $res);
1541                 $xpath = new DOMXPath($doc);
1542
1543                 $rewrite_base_url = $site_url ? $site_url : get_self_url_prefix();
1544
1545                 $entries = $xpath->query('(//a[@href]|//img[@src]|//video/source[@src]|//audio/source[@src])');
1546
1547                 foreach ($entries as $entry) {
1548
1549                         if ($entry->hasAttribute('href')) {
1550                                 $entry->setAttribute('href',
1551                                         rewrite_relative_url($rewrite_base_url, $entry->getAttribute('href')));
1552
1553                                 $entry->setAttribute('rel', 'noopener noreferrer');
1554                         }
1555
1556                         if ($entry->hasAttribute('src')) {
1557                                 $src = rewrite_relative_url($rewrite_base_url, $entry->getAttribute('src'));
1558                                 $cached_filename = CACHE_DIR . '/images/' . sha1($src);
1559
1560                                 if (file_exists($cached_filename)) {
1561
1562                                         // this is strictly cosmetic
1563                                         if ($entry->tagName == 'img') {
1564                                                 $suffix = ".png";
1565                                         } else if ($entry->parentNode && $entry->parentNode->tagName == "video") {
1566                                                 $suffix = ".mp4";
1567                                         } else if ($entry->parentNode && $entry->parentNode->tagName == "audio") {
1568                                                 $suffix = ".ogg";
1569                                         } else {
1570                                                 $suffix = "";
1571                                         }
1572
1573                                         $src = get_self_url_prefix() . '/public.php?op=cached_url&hash=' . sha1($src) . $suffix;
1574
1575                                         if ($entry->hasAttribute('srcset')) {
1576                                                 $entry->removeAttribute('srcset');
1577                                         }
1578
1579                                         if ($entry->hasAttribute('sizes')) {
1580                                                 $entry->removeAttribute('sizes');
1581                                         }
1582                                 }
1583
1584                                 $entry->setAttribute('src', $src);
1585                         }
1586
1587                         if ($entry->nodeName == 'img') {
1588                                 $entry->setAttribute('referrerpolicy', 'no-referrer');
1589
1590                                 if ($entry->hasAttribute('src')) {
1591                                         $is_https_url = parse_url($entry->getAttribute('src'), PHP_URL_SCHEME) === 'https';
1592
1593                                         if (is_prefix_https() && !$is_https_url) {
1594
1595                                                 if ($entry->hasAttribute('srcset')) {
1596                                                         $entry->removeAttribute('srcset');
1597                                                 }
1598
1599                                                 if ($entry->hasAttribute('sizes')) {
1600                                                         $entry->removeAttribute('sizes');
1601                                                 }
1602                                         }
1603                                 }
1604
1605                                 if (($owner && get_pref("STRIP_IMAGES", $owner)) ||
1606                                         $force_remove_images || $_SESSION["bw_limit"]) {
1607
1608                                         $p = $doc->createElement('p');
1609
1610                                         $a = $doc->createElement('a');
1611                                         $a->setAttribute('href', $entry->getAttribute('src'));
1612
1613                                         $a->appendChild(new DOMText($entry->getAttribute('src')));
1614                                         $a->setAttribute('target', '_blank');
1615                                         $a->setAttribute('rel', 'noopener noreferrer');
1616
1617                                         $p->appendChild($a);
1618
1619                                         $entry->parentNode->replaceChild($p, $entry);
1620                                 }
1621                         }
1622
1623                         if (strtolower($entry->nodeName) == "a") {
1624                                 $entry->setAttribute("target", "_blank");
1625                                 $entry->setAttribute("rel", "noopener noreferrer");
1626                         }
1627                 }
1628
1629                 $entries = $xpath->query('//iframe');
1630                 foreach ($entries as $entry) {
1631                         if (!iframe_whitelisted($entry)) {
1632                                 $entry->setAttribute('sandbox', 'allow-scripts');
1633                         } else {
1634                                 if (is_prefix_https()) {
1635                                         $entry->setAttribute("src",
1636                                                 str_replace("http://", "https://",
1637                                                         $entry->getAttribute("src")));
1638                                 }
1639                         }
1640                 }
1641
1642                 $allowed_elements = array('a', 'address', 'acronym', 'audio', 'article', 'aside',
1643                         'b', 'bdi', 'bdo', 'big', 'blockquote', 'body', 'br',
1644                         'caption', 'cite', 'center', 'code', 'col', 'colgroup',
1645                         'data', 'dd', 'del', 'details', 'description', 'dfn', 'div', 'dl', 'font',
1646                         'dt', 'em', 'footer', 'figure', 'figcaption',
1647                         'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'header', 'hr', 'html', 'i',
1648                         'img', 'ins', 'kbd', 'li', 'main', 'mark', 'nav', 'noscript',
1649                         'ol', 'p', 'pre', 'q', 'ruby', 'rp', 'rt', 's', 'samp', 'section',
1650                         'small', 'source', 'span', 'strike', 'strong', 'sub', 'summary',
1651                         'sup', 'table', 'tbody', 'td', 'tfoot', 'th', 'thead', 'time',
1652                         'tr', 'track', 'tt', 'u', 'ul', 'var', 'wbr', 'video', 'xml:namespace' );
1653
1654                 if ($_SESSION['hasSandbox']) $allowed_elements[] = 'iframe';
1655
1656                 $disallowed_attributes = array('id', 'style', 'class');
1657
1658                 foreach (PluginHost::getInstance()->get_hooks(PluginHost::HOOK_SANITIZE) as $plugin) {
1659                         $retval = $plugin->hook_sanitize($doc, $site_url, $allowed_elements, $disallowed_attributes, $article_id);
1660                         if (is_array($retval)) {
1661                                 $doc = $retval[0];
1662                                 $allowed_elements = $retval[1];
1663                                 $disallowed_attributes = $retval[2];
1664                         } else {
1665                                 $doc = $retval;
1666                         }
1667                 }
1668
1669                 $doc->removeChild($doc->firstChild); //remove doctype
1670                 $doc = strip_harmful_tags($doc, $allowed_elements, $disallowed_attributes);
1671
1672                 if ($highlight_words) {
1673                         foreach ($highlight_words as $word) {
1674
1675                                 // http://stackoverflow.com/questions/4081372/highlight-keywords-in-a-paragraph
1676
1677                                 $elements = $xpath->query("//*/text()");
1678
1679                                 foreach ($elements as $child) {
1680
1681                                         $fragment = $doc->createDocumentFragment();
1682                                         $text = $child->textContent;
1683
1684                                         while (($pos = mb_stripos($text, $word)) !== false) {
1685                                                 $fragment->appendChild(new DomText(mb_substr($text, 0, $pos)));
1686                                                 $word = mb_substr($text, $pos, mb_strlen($word));
1687                                                 $highlight = $doc->createElement('span');
1688                                                 $highlight->appendChild(new DomText($word));
1689                                                 $highlight->setAttribute('class', 'highlight');
1690                                                 $fragment->appendChild($highlight);
1691                                                 $text = mb_substr($text, $pos + mb_strlen($word));
1692                                         }
1693
1694                                         if (!empty($text)) $fragment->appendChild(new DomText($text));
1695
1696                                         $child->parentNode->replaceChild($fragment, $child);
1697                                 }
1698                         }
1699                 }
1700
1701                 $res = $doc->saveHTML();
1702
1703                 /* strip everything outside of <body>...</body> */
1704
1705                 $res_frag = array();
1706                 if (preg_match('/<body>(.*)<\/body>/is', $res, $res_frag)) {
1707                         return $res_frag[1];
1708                 } else {
1709                         return $res;
1710                 }
1711         }
1712
1713         function strip_harmful_tags($doc, $allowed_elements, $disallowed_attributes) {
1714                 $xpath = new DOMXPath($doc);
1715                 $entries = $xpath->query('//*');
1716
1717                 foreach ($entries as $entry) {
1718                         if (!in_array($entry->nodeName, $allowed_elements)) {
1719                                 $entry->parentNode->removeChild($entry);
1720                         }
1721
1722                         if ($entry->hasAttributes()) {
1723                                 $attrs_to_remove = array();
1724
1725                                 foreach ($entry->attributes as $attr) {
1726
1727                                         if (strpos($attr->nodeName, 'on') === 0) {
1728                                                 array_push($attrs_to_remove, $attr);
1729                                         }
1730
1731                                         if ($attr->nodeName == 'href' && stripos($attr->value, 'javascript:') === 0) {
1732                                                 array_push($attrs_to_remove, $attr);
1733                                         }
1734
1735                                         if (in_array($attr->nodeName, $disallowed_attributes)) {
1736                                                 array_push($attrs_to_remove, $attr);
1737                                         }
1738                                 }
1739
1740                                 foreach ($attrs_to_remove as $attr) {
1741                                         $entry->removeAttributeNode($attr);
1742                                 }
1743                         }
1744                 }
1745
1746                 return $doc;
1747         }
1748
1749         function trim_array($array) {
1750                 $tmp = $array;
1751                 array_walk($tmp, 'trim');
1752                 return $tmp;
1753         }
1754
1755         function tag_is_valid($tag) {
1756                 if ($tag == '') return false;
1757                 if (is_numeric($tag)) return false;
1758                 if (mb_strlen($tag) > 250) return false;
1759
1760                 if (!$tag) return false;
1761
1762                 return true;
1763         }
1764
1765         function render_login_form() {
1766                 header('Cache-Control: public');
1767
1768                 require_once "login_form.php";
1769                 exit;
1770         }
1771
1772         function T_sprintf() {
1773                 $args = func_get_args();
1774                 return vsprintf(__(array_shift($args)), $args);
1775         }
1776
1777         function print_checkpoint($n, $s) {
1778                 $ts = microtime(true);
1779                 echo sprintf("<!-- CP[$n] %.4f seconds -->\n", $ts - $s);
1780                 return $ts;
1781         }
1782
1783         function sanitize_tag($tag) {
1784                 $tag = trim($tag);
1785
1786                 $tag = mb_strtolower($tag, 'utf-8');
1787
1788                 $tag = preg_replace('/[,\'\"\+\>\<]/', "", $tag);
1789
1790                 if (DB_TYPE == "mysql") {
1791                         $tag = preg_replace('/[\x{10000}-\x{10FFFF}]/u', "\xEF\xBF\xBD", $tag);
1792                 }
1793
1794                 return $tag;
1795         }
1796
1797         function is_server_https() {
1798                 return (!empty($_SERVER['HTTPS']) && ($_SERVER['HTTPS'] != 'off')) || $_SERVER['HTTP_X_FORWARDED_PROTO'] == 'https';
1799         }
1800
1801         function is_prefix_https() {
1802                 return parse_url(SELF_URL_PATH, PHP_URL_SCHEME) == 'https';
1803         }
1804
1805         // this returns SELF_URL_PATH sans ending slash
1806         function get_self_url_prefix() {
1807                 if (strrpos(SELF_URL_PATH, "/") === strlen(SELF_URL_PATH)-1) {
1808                         return substr(SELF_URL_PATH, 0, strlen(SELF_URL_PATH)-1);
1809                 } else {
1810                         return SELF_URL_PATH;
1811                 }
1812         }
1813
1814         function encrypt_password($pass, $salt = '', $mode2 = false) {
1815                 if ($salt && $mode2) {
1816                         return "MODE2:" . hash('sha256', $salt . $pass);
1817                 } else if ($salt) {
1818                         return "SHA1X:" . sha1("$salt:$pass");
1819                 } else {
1820                         return "SHA1:" . sha1($pass);
1821                 }
1822         } // function encrypt_password
1823
1824         function load_filters($feed_id, $owner_uid) {
1825                 $filters = array();
1826
1827                 $feed_id = (int) $feed_id;
1828                 $cat_id = (int)Feeds::getFeedCategory($feed_id);
1829
1830                 if ($cat_id == 0)
1831                         $null_cat_qpart = "cat_id IS NULL OR";
1832                 else
1833                         $null_cat_qpart = "";
1834
1835                 $pdo = Db::pdo();
1836
1837                 $sth = $pdo->prepare("SELECT * FROM ttrss_filters2 WHERE
1838                                 owner_uid = ? AND enabled = true ORDER BY order_id, title");
1839                 $sth->execute([$owner_uid]);
1840
1841                 $check_cats = array_merge(
1842                         Feeds::getParentCategories($cat_id, $owner_uid),
1843                         [$cat_id]);
1844
1845                 $check_cats_str = join(",", $check_cats);
1846                 $check_cats_fullids = array_map(function($a) { return "CAT:$a"; }, $check_cats);
1847
1848                 while ($line = $sth->fetch()) {
1849                         $filter_id = $line["id"];
1850
1851             $match_any_rule = sql_bool_to_bool($line["match_any_rule"]);
1852
1853                         $sth2 = $pdo->prepare("SELECT
1854                                         r.reg_exp, r.inverse, r.feed_id, r.cat_id, r.cat_filter, r.match_on, t.name AS type_name
1855                                         FROM ttrss_filters2_rules AS r,
1856                                         ttrss_filter_types AS t
1857                                         WHERE
1858                                             (match_on IS NOT NULL OR
1859                                                   (($null_cat_qpart (cat_id IS NULL AND cat_filter = false) OR cat_id IN ($check_cats_str)) AND
1860                                                   (feed_id IS NULL OR feed_id = ?))) AND
1861                                                 filter_type = t.id AND filter_id = ?");
1862                         $sth2->execute([$feed_id, $filter_id]);
1863
1864                         $rules = array();
1865                         $actions = array();
1866
1867                         while ($rule_line = $sth2->fetch()) {
1868         #                               print_r($rule_line);
1869
1870                 if ($rule_line["match_on"]) {
1871                     $match_on = json_decode($rule_line["match_on"], true);
1872
1873                     if (in_array("0", $match_on) || in_array($feed_id, $match_on) || count(array_intersect($check_cats_fullids, $match_on)) > 0) {
1874
1875                         $rule = array();
1876                         $rule["reg_exp"] = $rule_line["reg_exp"];
1877                         $rule["type"] = $rule_line["type_name"];
1878                         $rule["inverse"] = sql_bool_to_bool($rule_line["inverse"]);
1879
1880                         array_push($rules, $rule);
1881                     } else if (!$match_any_rule) {
1882                         // this filter contains a rule that doesn't match to this feed/category combination
1883                         // thus filter has to be rejected
1884
1885                         $rules = [];
1886                         break;
1887                     }
1888
1889                 } else {
1890
1891                     $rule = array();
1892                     $rule["reg_exp"] = $rule_line["reg_exp"];
1893                     $rule["type"] = $rule_line["type_name"];
1894                     $rule["inverse"] = sql_bool_to_bool($rule_line["inverse"]);
1895
1896                     array_push($rules, $rule);
1897                 }
1898                         }
1899
1900                         if (count($rules) > 0) {
1901                 $sth2 = $pdo->prepare("SELECT a.action_param,t.name AS type_name
1902                         FROM ttrss_filters2_actions AS a,
1903                         ttrss_filter_actions AS t
1904                         WHERE
1905                             action_id = t.id AND filter_id = ?");
1906                 $sth2->execute([$filter_id]);
1907
1908                 while ($action_line = $sth2->fetch()) {
1909                     #                           print_r($action_line);
1910
1911                     $action = array();
1912                     $action["type"] = $action_line["type_name"];
1913                     $action["param"] = $action_line["action_param"];
1914
1915                     array_push($actions, $action);
1916                 }
1917             }
1918
1919                         $filter = array();
1920                         $filter["match_any_rule"] = sql_bool_to_bool($line["match_any_rule"]);
1921                         $filter["inverse"] = sql_bool_to_bool($line["inverse"]);
1922                         $filter["rules"] = $rules;
1923                         $filter["actions"] = $actions;
1924
1925                         if (count($rules) > 0 && count($actions) > 0) {
1926                                 array_push($filters, $filter);
1927                         }
1928                 }
1929
1930                 return $filters;
1931         }
1932
1933         function get_score_pic($score) {
1934                 if ($score > 100) {
1935                         return "score_high.png";
1936                 } else if ($score > 0) {
1937                         return "score_half_high.png";
1938                 } else if ($score < -100) {
1939                         return "score_low.png";
1940                 } else if ($score < 0) {
1941                         return "score_half_low.png";
1942                 } else {
1943                         return "score_neutral.png";
1944                 }
1945         }
1946
1947         function init_plugins() {
1948                 PluginHost::getInstance()->load(PLUGINS, PluginHost::KIND_ALL);
1949
1950                 return true;
1951         }
1952
1953         function add_feed_category($feed_cat, $parent_cat_id = false) {
1954
1955                 if (!$feed_cat) return false;
1956
1957                 $feed_cat = mb_substr($feed_cat, 0, 250);
1958                 if (!$parent_cat_id) $parent_cat_id = null;
1959
1960                 $pdo = Db::pdo();
1961                 $tr_in_progress = false;
1962
1963                 try {
1964                         $pdo->beginTransaction();
1965                 } catch (Exception $e) {
1966                         $tr_in_progress = true;
1967                 }
1968
1969                 $sth = $pdo->prepare("SELECT id FROM ttrss_feed_categories
1970                                 WHERE (parent_cat = :parent OR (:parent IS NULL AND parent_cat IS NULL))
1971                                 AND title = :title AND owner_uid = :uid");
1972                 $sth->execute([':parent' => $parent_cat_id, ':title' => $feed_cat, ':uid' => $_SESSION['uid']]);
1973
1974                 if (!$sth->fetch()) {
1975
1976                         $sth = $pdo->prepare("INSERT INTO ttrss_feed_categories (owner_uid,title,parent_cat)
1977                                         VALUES (?, ?, ?)");
1978                         $sth->execute([$_SESSION['uid'], $feed_cat, $parent_cat_id]);
1979
1980                         if (!$tr_in_progress) $pdo->commit();
1981
1982                         return true;
1983                 }
1984
1985         $pdo->commit();
1986
1987                 return false;
1988         }
1989
1990         /**
1991          * Fixes incomplete URLs by prepending "http://".
1992          * Also replaces feed:// with http://, and
1993          * prepends a trailing slash if the url is a domain name only.
1994          *
1995          * @param string $url Possibly incomplete URL
1996          *
1997          * @return string Fixed URL.
1998          */
1999         function fix_url($url) {
2000
2001                 // support schema-less urls
2002                 if (strpos($url, '//') === 0) {
2003                         $url = 'https:' . $url;
2004                 }
2005
2006                 if (strpos($url, '://') === false) {
2007                         $url = 'http://' . $url;
2008                 } else if (substr($url, 0, 5) == 'feed:') {
2009                         $url = 'http:' . substr($url, 5);
2010                 }
2011
2012                 //prepend slash if the URL has no slash in it
2013                 // "http://www.example" -> "http://www.example/"
2014                 if (strpos($url, '/', strpos($url, ':') + 3) === false) {
2015                         $url .= '/';
2016                 }
2017
2018                 //convert IDNA hostname to punycode if possible
2019                 if (function_exists("idn_to_ascii")) {
2020                         $parts = parse_url($url);
2021                         if (mb_detect_encoding($parts['host']) != 'ASCII')
2022                         {
2023                                 $parts['host'] = idn_to_ascii($parts['host']);
2024                                 $url = build_url($parts);
2025                         }
2026                 }
2027
2028                 if ($url != "http:///")
2029                         return $url;
2030                 else
2031                         return '';
2032         }
2033
2034         function validate_feed_url($url) {
2035                 $parts = parse_url($url);
2036
2037                 return ($parts['scheme'] == 'http' || $parts['scheme'] == 'feed' || $parts['scheme'] == 'https');
2038
2039         }
2040
2041         /* function save_email_address($email) {
2042                 // FIXME: implement persistent storage of emails
2043
2044                 if (!$_SESSION['stored_emails'])
2045                         $_SESSION['stored_emails'] = array();
2046
2047                 if (!in_array($email, $_SESSION['stored_emails']))
2048                         array_push($_SESSION['stored_emails'], $email);
2049         } */
2050
2051
2052         function get_feed_access_key($feed_id, $is_cat, $owner_uid = false) {
2053
2054                 if (!$owner_uid) $owner_uid = $_SESSION["uid"];
2055
2056                 $is_cat = bool_to_sql_bool($is_cat);
2057
2058                 $pdo = Db::pdo();
2059
2060                 $sth = $pdo->prepare("SELECT access_key FROM ttrss_access_keys
2061                                 WHERE feed_id = ? AND is_cat = ?
2062                                 AND owner_uid = ?");
2063                 $sth->execute([$feed_id, (int)$is_cat, $owner_uid]);
2064
2065                 if ($row = $sth->fetch()) {
2066                         return $row["access_key"];
2067                 } else {
2068                         $key = uniqid_short();
2069
2070                         $sth = $pdo->prepare("INSERT INTO ttrss_access_keys
2071                                         (access_key, feed_id, is_cat, owner_uid)
2072                                         VALUES (?, ?, ?, ?)");
2073
2074                         $sth->execute([$key, $feed_id, (int)$is_cat, $owner_uid]);
2075
2076                         return $key;
2077                 }
2078         }
2079
2080         function get_feeds_from_html($url, $content)
2081         {
2082                 $url     = fix_url($url);
2083                 $baseUrl = substr($url, 0, strrpos($url, '/') + 1);
2084
2085                 libxml_use_internal_errors(true);
2086
2087                 $doc = new DOMDocument();
2088                 $doc->loadHTML($content);
2089                 $xpath = new DOMXPath($doc);
2090                 $entries = $xpath->query('/html/head/link[@rel="alternate" and '.
2091                         '(contains(@type,"rss") or contains(@type,"atom"))]|/html/head/link[@rel="feed"]');
2092                 $feedUrls = array();
2093                 foreach ($entries as $entry) {
2094                         if ($entry->hasAttribute('href')) {
2095                                 $title = $entry->getAttribute('title');
2096                                 if ($title == '') {
2097                                         $title = $entry->getAttribute('type');
2098                                 }
2099                                 $feedUrl = rewrite_relative_url(
2100                                         $baseUrl, $entry->getAttribute('href')
2101                                 );
2102                                 $feedUrls[$feedUrl] = $title;
2103                         }
2104                 }
2105                 return $feedUrls;
2106         }
2107
2108         function is_html($content) {
2109                 return preg_match("/<html|DOCTYPE html/i", substr($content, 0, 100)) !== 0;
2110         }
2111
2112         function url_is_html($url, $login = false, $pass = false) {
2113                 return is_html(fetch_file_contents($url, false, $login, $pass));
2114         }
2115
2116         function build_url($parts) {
2117                 return $parts['scheme'] . "://" . $parts['host'] . $parts['path'];
2118         }
2119
2120         function cleanup_url_path($path) {
2121                 $path = str_replace("/./", "/", $path);
2122                 $path = str_replace("//", "/", $path);
2123
2124                 return $path;
2125         }
2126
2127         /**
2128          * Converts a (possibly) relative URL to a absolute one.
2129          *
2130          * @param string $url     Base URL (i.e. from where the document is)
2131          * @param string $rel_url Possibly relative URL in the document
2132          *
2133          * @return string Absolute URL
2134          */
2135         function rewrite_relative_url($url, $rel_url) {
2136                 if (strpos($rel_url, "://") !== false) {
2137                         return $rel_url;
2138                 } else if (strpos($rel_url, "//") === 0) {
2139                         # protocol-relative URL (rare but they exist)
2140                         return $rel_url;
2141                 } else if (preg_match("/^[a-z]+:/i", $rel_url)) {
2142                         # magnet:, feed:, etc
2143                         return $rel_url;
2144                 } else if (strpos($rel_url, "/") === 0) {
2145                         $parts = parse_url($url);
2146                         $parts['path'] = $rel_url;
2147                         $parts['path'] = cleanup_url_path($parts['path']);
2148
2149                         return build_url($parts);
2150
2151                 } else {
2152                         $parts = parse_url($url);
2153                         if (!isset($parts['path'])) {
2154                                 $parts['path'] = '/';
2155                         }
2156                         $dir = $parts['path'];
2157                         if (substr($dir, -1) !== '/') {
2158                                 $dir = dirname($parts['path']);
2159                                 $dir !== '/' && $dir .= '/';
2160                         }
2161                         $parts['path'] = $dir . $rel_url;
2162                         $parts['path'] = cleanup_url_path($parts['path']);
2163
2164                         return build_url($parts);
2165                 }
2166         }
2167
2168         function cleanup_tags($days = 14, $limit = 1000) {
2169
2170             $days = (int) $days;
2171
2172                 if (DB_TYPE == "pgsql") {
2173                         $interval_query = "date_updated < NOW() - INTERVAL '$days days'";
2174                 } else if (DB_TYPE == "mysql") {
2175                         $interval_query = "date_updated < DATE_SUB(NOW(), INTERVAL $days DAY)";
2176                 }
2177
2178                 $tags_deleted = 0;
2179
2180         $pdo = Db::pdo();
2181
2182         while ($limit > 0) {
2183                         $limit_part = 500;
2184
2185                         $sth = $pdo->prepare("SELECT ttrss_tags.id AS id
2186                                         FROM ttrss_tags, ttrss_user_entries, ttrss_entries
2187                                         WHERE post_int_id = int_id AND $interval_query AND
2188                                         ref_id = ttrss_entries.id AND tag_cache != '' LIMIT ?");
2189                         $sth->execute([$limit]);
2190
2191                         $ids = array();
2192
2193                         while ($line = $sth->fetch()) {
2194                                 array_push($ids, $line['id']);
2195                         }
2196
2197                         if (count($ids) > 0) {
2198                                 $ids = join(",", $ids);
2199
2200                                 $usth = $pdo->query("DELETE FROM ttrss_tags WHERE id IN ($ids)");
2201                                 $tags_deleted = $usth->rowCount();
2202                         } else {
2203                                 break;
2204                         }
2205
2206                         $limit -= $limit_part;
2207                 }
2208
2209                 return $tags_deleted;
2210         }
2211
2212         function print_user_stylesheet() {
2213                 $value = get_pref('USER_STYLESHEET');
2214
2215                 if ($value) {
2216                         print "<style type=\"text/css\">";
2217                         print str_replace("<br/>", "\n", $value);
2218                         print "</style>";
2219                 }
2220
2221         }
2222
2223         function filter_to_sql($filter, $owner_uid) {
2224                 $query = array();
2225
2226                 $pdo = Db::pdo();
2227
2228                 if (DB_TYPE == "pgsql")
2229                         $reg_qpart = "~";
2230                 else
2231                         $reg_qpart = "REGEXP";
2232
2233                 foreach ($filter["rules"] AS $rule) {
2234                         $rule['reg_exp'] = str_replace('/', '\/', $rule["reg_exp"]);
2235                         $regexp_valid = preg_match('/' . $rule['reg_exp'] . '/',
2236                                         $rule['reg_exp']) !== FALSE;
2237
2238                         if ($regexp_valid) {
2239
2240                                 $rule['reg_exp'] = $pdo->quote($rule['reg_exp']);
2241
2242                                 switch ($rule["type"]) {
2243                                         case "title":
2244                                                 $qpart = "LOWER(ttrss_entries.title) $reg_qpart LOWER('".
2245                                                         $rule['reg_exp'] . "')";
2246                                                 break;
2247                                         case "content":
2248                                                 $qpart = "LOWER(ttrss_entries.content) $reg_qpart LOWER('".
2249                                                         $rule['reg_exp'] . "')";
2250                                                 break;
2251                                         case "both":
2252                                                 $qpart = "LOWER(ttrss_entries.title) $reg_qpart LOWER('".
2253                                                         $rule['reg_exp'] . "') OR LOWER(" .
2254                                                         "ttrss_entries.content) $reg_qpart LOWER('" . $rule['reg_exp'] . "')";
2255                                                 break;
2256                                         case "tag":
2257                                                 $qpart = "LOWER(ttrss_user_entries.tag_cache) $reg_qpart LOWER('".
2258                                                         $rule['reg_exp'] . "')";
2259                                                 break;
2260                                         case "link":
2261                                                 $qpart = "LOWER(ttrss_entries.link) $reg_qpart LOWER('".
2262                                                         $rule['reg_exp'] . "')";
2263                                                 break;
2264                                         case "author":
2265                                                 $qpart = "LOWER(ttrss_entries.author) $reg_qpart LOWER('".
2266                                                         $rule['reg_exp'] . "')";
2267                                                 break;
2268                                 }
2269
2270                                 if (isset($rule['inverse'])) $qpart = "NOT ($qpart)";
2271
2272                                 if (isset($rule["feed_id"]) && $rule["feed_id"] > 0) {
2273                                         $qpart .= " AND feed_id = " . $pdo->quote($rule["feed_id"]);
2274                                 }
2275
2276                                 if (isset($rule["cat_id"])) {
2277
2278                                         if ($rule["cat_id"] > 0) {
2279                                                 $children = Feeds::getChildCategories($rule["cat_id"], $owner_uid);
2280                                                 array_push($children, $rule["cat_id"]);
2281                                                 $children = array_map("intval", $children);
2282
2283                                                 $children = join(",", $children);
2284
2285                                                 $cat_qpart = "cat_id IN ($children)";
2286                                         } else {
2287                                                 $cat_qpart = "cat_id IS NULL";
2288                                         }
2289
2290                                         $qpart .= " AND $cat_qpart";
2291                                 }
2292
2293                                 $qpart .= " AND feed_id IS NOT NULL";
2294
2295                                 array_push($query, "($qpart)");
2296
2297                         }
2298                 }
2299
2300                 if (count($query) > 0) {
2301                         $fullquery = "(" . join($filter["match_any_rule"] ? "OR" : "AND", $query) . ")";
2302                 } else {
2303                         $fullquery = "(false)";
2304                 }
2305
2306                 if ($filter['inverse']) $fullquery = "(NOT $fullquery)";
2307
2308                 return $fullquery;
2309         }
2310
2311         if (!function_exists('gzdecode')) {
2312                 function gzdecode($string) { // no support for 2nd argument
2313                         return file_get_contents('compress.zlib://data:who/cares;base64,'.
2314                                 base64_encode($string));
2315                 }
2316         }
2317
2318         function get_random_bytes($length) {
2319                 if (function_exists('openssl_random_pseudo_bytes')) {
2320                         return openssl_random_pseudo_bytes($length);
2321                 } else {
2322                         $output = "";
2323
2324                         for ($i = 0; $i < $length; $i++)
2325                                 $output .= chr(mt_rand(0, 255));
2326
2327                         return $output;
2328                 }
2329         }
2330
2331         function read_stdin() {
2332                 $fp = fopen("php://stdin", "r");
2333
2334                 if ($fp) {
2335                         $line = trim(fgets($fp));
2336                         fclose($fp);
2337                         return $line;
2338                 }
2339
2340                 return null;
2341         }
2342
2343         function implements_interface($class, $interface) {
2344                 return in_array($interface, class_implements($class));
2345         }
2346
2347         function get_minified_js($files) {
2348                 require_once 'lib/jshrink/Minifier.php';
2349
2350                 $rv = '';
2351
2352                 foreach ($files as $js) {
2353                         if (!isset($_GET['debug'])) {
2354                                 $cached_file = CACHE_DIR . "/js/".basename($js);
2355
2356                                 if (file_exists($cached_file) && is_readable($cached_file) && filemtime($cached_file) >= filemtime("js/$js")) {
2357
2358                                         list($header, $contents) = explode("\n", file_get_contents($cached_file), 2);
2359
2360                                         if ($header && $contents) {
2361                                                 list($htag, $hversion) = explode(":", $header);
2362
2363                                                 if ($htag == "tt-rss" && $hversion == VERSION) {
2364                                                         $rv .= $contents;
2365                                                         continue;
2366                                                 }
2367                                         }
2368                                 }
2369
2370                                 $minified = JShrink\Minifier::minify(file_get_contents("js/$js"));
2371                                 file_put_contents($cached_file, "tt-rss:" . VERSION . "\n" . $minified);
2372                                 $rv .= $minified;
2373
2374                         } else {
2375                                 $rv .= file_get_contents("js/$js"); // no cache in debug mode
2376                         }
2377                 }
2378
2379                 return $rv;
2380         }
2381
2382         function calculate_dep_timestamp() {
2383                 $files = array_merge(glob("js/*.js"), glob("css/*.css"));
2384
2385                 $max_ts = -1;
2386
2387                 foreach ($files as $file) {
2388                         if (filemtime($file) > $max_ts) $max_ts = filemtime($file);
2389                 }
2390
2391                 return $max_ts;
2392         }
2393
2394         function T_js_decl($s1, $s2) {
2395                 if ($s1 && $s2) {
2396                         $s1 = preg_replace("/\n/", "", $s1);
2397                         $s2 = preg_replace("/\n/", "", $s2);
2398
2399                         $s1 = preg_replace("/\"/", "\\\"", $s1);
2400                         $s2 = preg_replace("/\"/", "\\\"", $s2);
2401
2402                         return "T_messages[\"$s1\"] = \"$s2\";\n";
2403                 }
2404         }
2405
2406         function init_js_translations() {
2407
2408                 print 'var T_messages = new Object();
2409
2410                         function __(msg) {
2411                                 if (T_messages[msg]) {
2412                                         return T_messages[msg];
2413                                 } else {
2414                                         return msg;
2415                                 }
2416                         }
2417
2418                         function ngettext(msg1, msg2, n) {
2419                                 return __((parseInt(n) > 1) ? msg2 : msg1);
2420                         }';
2421
2422                 $l10n = _get_reader();
2423
2424                 for ($i = 0; $i < $l10n->total; $i++) {
2425                         $orig = $l10n->get_original_string($i);
2426                         if(strpos($orig, "\000") !== FALSE) { // Plural forms
2427                                 $key = explode(chr(0), $orig);
2428                                 print T_js_decl($key[0], _ngettext($key[0], $key[1], 1)); // Singular
2429                                 print T_js_decl($key[1], _ngettext($key[0], $key[1], 2)); // Plural
2430                         } else {
2431                                 $translation = __($orig);
2432                                 print T_js_decl($orig, $translation);
2433                         }
2434                 }
2435         }
2436
2437         function get_theme_path($theme) {
2438                 if ($theme == "default.php")
2439                         return "css/default.css";
2440
2441                 $check = "themes/$theme";
2442                 if (file_exists($check)) return $check;
2443
2444                 $check = "themes.local/$theme";
2445                 if (file_exists($check)) return $check;
2446         }
2447
2448         function theme_valid($theme) {
2449                 $bundled_themes = [ "default.php", "night.css", "compact.css" ];
2450
2451                 if (in_array($theme, $bundled_themes)) return true;
2452
2453                 $file = "themes/" . basename($theme);
2454
2455                 if (!file_exists($file)) $file = "themes.local/" . basename($theme);
2456
2457                 if (file_exists($file) && is_readable($file)) {
2458                         $fh = fopen($file, "r");
2459
2460                         if ($fh) {
2461                                 $header = fgets($fh);
2462                                 fclose($fh);
2463
2464                                 return strpos($header, "supports-version:" . VERSION_STATIC) !== FALSE;
2465                         }
2466                 }
2467
2468                 return false;
2469         }
2470
2471         /**
2472          * @SuppressWarnings(unused)
2473          */
2474         function error_json($code) {
2475                 require_once "errors.php";
2476
2477                 @$message = $ERRORS[$code];
2478
2479                 return json_encode(array("error" =>
2480                         array("code" => $code, "message" => $message)));
2481
2482         }
2483
2484         /*function abs_to_rel_path($dir) {
2485                 $tmp = str_replace(dirname(__DIR__), "", $dir);
2486
2487                 if (strlen($tmp) > 0 && substr($tmp, 0, 1) == "/") $tmp = substr($tmp, 1);
2488
2489                 return $tmp;
2490         }*/
2491
2492         function get_upload_error_message($code) {
2493
2494                 $errors = array(
2495                         0 => __('There is no error, the file uploaded with success'),
2496                         1 => __('The uploaded file exceeds the upload_max_filesize directive in php.ini'),
2497                         2 => __('The uploaded file exceeds the MAX_FILE_SIZE directive that was specified in the HTML form'),
2498                         3 => __('The uploaded file was only partially uploaded'),
2499                         4 => __('No file was uploaded'),
2500                         6 => __('Missing a temporary folder'),
2501                         7 => __('Failed to write file to disk.'),
2502                         8 => __('A PHP extension stopped the file upload.'),
2503                 );
2504
2505                 return $errors[$code];
2506         }
2507
2508         function base64_img($filename) {
2509                 if (file_exists($filename)) {
2510                         $ext = pathinfo($filename, PATHINFO_EXTENSION);
2511
2512                         return "data:image/$ext;base64," . base64_encode(file_get_contents($filename));
2513                 } else {
2514                         return "";
2515                 }
2516         }
2517
2518         /*      this is essentially a wrapper for readfile() which allows plugins to hook
2519                 output with httpd-specific "fast" implementation i.e. X-Sendfile or whatever else
2520
2521                 hook function should return true if request was handled (or at least attempted to)
2522
2523                 note that this can be called without user context so the plugin to handle this
2524                 should be loaded systemwide in config.php */
2525         function send_local_file($filename) {
2526                 if (file_exists($filename)) {
2527                         $tmppluginhost = new PluginHost();
2528
2529                         $tmppluginhost->load(PLUGINS, PluginHost::KIND_SYSTEM);
2530                         $tmppluginhost->load_data();
2531
2532                         foreach ($tmppluginhost->get_hooks(PluginHost::HOOK_SEND_LOCAL_FILE) as $plugin) {
2533                                 if ($plugin->hook_send_local_file($filename)) return true;
2534                         }
2535
2536                         $mimetype = mime_content_type($filename);
2537                         header("Content-type: $mimetype");
2538
2539                         $stamp = gmdate("D, d M Y H:i:s", filemtime($filename)) . " GMT";
2540                         header("Last-Modified: $stamp", true);
2541
2542                         return readfile($filename);
2543                 } else {
2544                         return false;
2545                 }
2546         }
2547
2548         function check_mysql_tables() {
2549                 $pdo = Db::pdo();
2550
2551                 $sth = $pdo->prepare("SELECT engine, table_name FROM information_schema.tables WHERE
2552                         table_schema = ? AND table_name LIKE 'ttrss_%' AND engine != 'InnoDB'");
2553                 $sth->execute([DB_NAME]);
2554
2555                 $bad_tables = [];
2556
2557                 while ($line = $sth->fetch()) {
2558                         array_push($bad_tables, $line);
2559                 }
2560
2561                 return $bad_tables;
2562         }
2563
2564         function validate_field($string, $allowed, $default = "") {
2565                 if (in_array($string, $allowed))
2566                         return $string;
2567                 else
2568                         return $default;
2569         }
2570
2571     function arr_qmarks($arr) {
2572         return str_repeat('?,', count($arr) - 1) . '?';
2573     }