src/Database/DBStructure.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2020, Friendica
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Database;
  23
  24 use Exception;
  25 use Friendica\Core\Hook;
  26 use Friendica\Core\Logger;
  27 use Friendica\DI;
  28 use Friendica\Model\Item;
  29 use Friendica\Model\User;
  30 use Friendica\Util\DateTimeFormat;
  31
  32 /**
  33  * This class contains functions that doesn't need to know if pdo, mysqli or whatever is used.
  34  */
  35 class DBStructure
  36 {
  37         const UPDATE_NOT_CHECKED = 0; // Database check wasn't executed before
  38         const UPDATE_SUCCESSFUL  = 1; // Database check was successful
  39         const UPDATE_FAILED      = 2; // Database check failed
  40
  41         const RENAME_COLUMN      = 0;
  42         const RENAME_PRIMARY_KEY = 1;
  43
  44         /**
  45          * Database structure definition loaded from config/dbstructure.config.php
  46          *
  47          * @var array
  48          */
  49         private static $definition = [];
  50
  51         /**
  52          * Converts all tables from MyISAM/InnoDB Antelope to InnoDB Barracuda
  53          */
  54         public static function convertToInnoDB()
  55         {
  56                 $tables = DBA::selectToArray(
  57                         ['information_schema' => 'tables'],
  58                         ['table_name'],
  59                         ['engine' => 'MyISAM', 'table_schema' => DBA::databaseName()]
  60                 );
  61
  62                 $tables = array_merge($tables, DBA::selectToArray(
  63                         ['information_schema' => 'tables'],
  64                         ['table_name'],
  65                         ['engine' => 'InnoDB', 'ROW_FORMAT' => ['COMPACT', 'REDUNDANT'], 'table_schema' => DBA::databaseName()]
  66                 ));
  67
  68                 if (!DBA::isResult($tables)) {
  69                         echo DI::l10n()->t('There are no tables on MyISAM or InnoDB with the Antelope file format.') . "\n";
  70                         return;
  71                 }
  72
  73                 foreach ($tables AS $table) {
  74                         $sql = "ALTER TABLE " . DBA::quoteIdentifier($table['table_name']) . " ENGINE=InnoDB ROW_FORMAT=DYNAMIC;";
  75                         echo $sql . "\n";
  76
  77                         $result = DBA::e($sql);
  78                         if (!DBA::isResult($result)) {
  79                                 self::printUpdateError($sql);
  80                         }
  81                 }
  82         }
  83
  84         /**
  85          * Print out database error messages
  86          *
  87          * @param string $message Message to be added to the error message
  88          *
  89          * @return string Error message
  90          */
  91         private static function printUpdateError($message)
  92         {
  93                 echo DI::l10n()->t("\nError %d occurred during database update:\n%s\n",
  94                         DBA::errorNo(), DBA::errorMessage());
  95
  96                 return DI::l10n()->t('Errors encountered performing database changes: ') . $message . EOL;
  97         }
  98
  99         public static function printStructure($basePath)
 100         {
 101                 $database = self::definition($basePath, false);
 102
 103                 echo "-- ------------------------------------------\n";
 104                 echo "-- " . FRIENDICA_PLATFORM . " " . FRIENDICA_VERSION . " (" . FRIENDICA_CODENAME, ")\n";
 105                 echo "-- DB_UPDATE_VERSION " . DB_UPDATE_VERSION . "\n";
 106                 echo "-- ------------------------------------------\n\n\n";
 107                 foreach ($database AS $name => $structure) {
 108                         echo "--\n";
 109                         echo "-- TABLE $name\n";
 110                         echo "--\n";
 111                         self::createTable($name, $structure, true, false);
 112
 113                         echo "\n";
 114                 }
 115
 116                 View::printStructure($basePath);
 117         }
 118
 119         /**
 120          * Loads the database structure definition from the static/dbstructure.config.php file.
 121          * On first pass, defines DB_UPDATE_VERSION constant.
 122          *
 123          * @see static/dbstructure.config.php
 124          * @param boolean $with_addons_structure Whether to tack on addons additional tables
 125          * @param string  $basePath              The base path of this application
 126          * @return array
 127          * @throws Exception
 128          */
 129         public static function definition($basePath, $with_addons_structure = true)
 130         {
 131                 if (!self::$definition) {
 132
 133                         $filename = $basePath . '/static/dbstructure.config.php';
 134
 135                         if (!is_readable($filename)) {
 136                                 throw new Exception('Missing database structure config file static/dbstructure.config.php');
 137                         }
 138
 139                         $definition = require $filename;
 140
 141                         if (!$definition) {
 142                                 throw new Exception('Corrupted database structure config file static/dbstructure.config.php');
 143                         }
 144
 145                         self::$definition = $definition;
 146                 } else {
 147                         $definition = self::$definition;
 148                 }
 149
 150                 if ($with_addons_structure) {
 151                         Hook::callAll('dbstructure_definition', $definition);
 152                 }
 153
 154                 return $definition;
 155         }
 156
 157         private static function createTable($name, $structure, $verbose, $action)
 158         {
 159                 $r = true;
 160
 161                 $engine = "";
 162                 $comment = "";
 163                 $sql_rows = [];
 164                 $primary_keys = [];
 165                 $foreign_keys = [];
 166
 167                 foreach ($structure["fields"] AS $fieldname => $field) {
 168                         $sql_rows[] = "`" . DBA::escape($fieldname) . "` " . self::FieldCommand($field);
 169                         if (!empty($field['primary'])) {
 170                                 $primary_keys[] = $fieldname;
 171                         }
 172                         if (!empty($field['foreign'])) {
 173                                 $foreign_keys[$fieldname] = $field;
 174                         }
 175                 }
 176
 177                 if (!empty($structure["indexes"])) {
 178                         foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 179                                 $sql_index = self::createIndex($indexname, $fieldnames, "");
 180                                 if (!is_null($sql_index)) {
 181                                         $sql_rows[] = $sql_index;
 182                                 }
 183                         }
 184                 }
 185
 186                 foreach ($foreign_keys AS $fieldname => $parameters) {
 187                         $sql_rows[] = self::foreignCommand($name, $fieldname, $parameters);
 188                 }
 189
 190                 if (isset($structure["engine"])) {
 191                         $engine = " ENGINE=" . $structure["engine"];
 192                 }
 193
 194                 if (isset($structure["comment"])) {
 195                         $comment = " COMMENT='" . DBA::escape($structure["comment"]) . "'";
 196                 }
 197
 198                 $sql = implode(",\n\t", $sql_rows);
 199
 200                 $sql = sprintf("CREATE TABLE IF NOT EXISTS `%s` (\n\t", DBA::escape($name)) . $sql .
 201                         "\n)" . $engine . " DEFAULT COLLATE utf8mb4_general_ci" . $comment;
 202                 if ($verbose) {
 203                         echo $sql . ";\n";
 204                 }
 205
 206                 if ($action) {
 207                         $r = DBA::e($sql);
 208                 }
 209
 210                 return $r;
 211         }
 212
 213         private static function FieldCommand($parameters, $create = true)
 214         {
 215                 $fieldstruct = $parameters["type"];
 216
 217                 if (isset($parameters["Collation"])) {
 218                         $fieldstruct .= " COLLATE " . $parameters["Collation"];
 219                 }
 220
 221                 if (isset($parameters["not null"])) {
 222                         $fieldstruct .= " NOT NULL";
 223                 }
 224
 225                 if (isset($parameters["default"])) {
 226                         if (strpos(strtolower($parameters["type"]), "int") !== false) {
 227                                 $fieldstruct .= " DEFAULT " . $parameters["default"];
 228                         } else {
 229                                 $fieldstruct .= " DEFAULT '" . $parameters["default"] . "'";
 230                         }
 231                 }
 232                 if (isset($parameters["extra"])) {
 233                         $fieldstruct .= " " . $parameters["extra"];
 234                 }
 235
 236                 if (isset($parameters["comment"])) {
 237                         $fieldstruct .= " COMMENT '" . DBA::escape($parameters["comment"]) . "'";
 238                 }
 239
 240                 /*if (($parameters["primary"] != "") && $create)
 241                         $fieldstruct .= " PRIMARY KEY";*/
 242
 243                 return ($fieldstruct);
 244         }
 245
 246         private static function createIndex($indexname, $fieldnames, $method = "ADD")
 247         {
 248                 $method = strtoupper(trim($method));
 249                 if ($method != "" && $method != "ADD") {
 250                         throw new Exception("Invalid parameter 'method' in self::createIndex(): '$method'");
 251                 }
 252
 253                 if (in_array($fieldnames[0], ["UNIQUE", "FULLTEXT"])) {
 254                         $index_type = array_shift($fieldnames);
 255                         $method .= " " . $index_type;
 256                 }
 257
 258                 $names = "";
 259                 foreach ($fieldnames AS $fieldname) {
 260                         if ($names != "") {
 261                                 $names .= ",";
 262                         }
 263
 264                         if (preg_match('|(.+)\((\d+)\)|', $fieldname, $matches)) {
 265                                 $names .= "`" . DBA::escape($matches[1]) . "`(" . intval($matches[2]) . ")";
 266                         } else {
 267                                 $names .= "`" . DBA::escape($fieldname) . "`";
 268                         }
 269                 }
 270
 271                 if ($indexname == "PRIMARY") {
 272                         return sprintf("%s PRIMARY KEY(%s)", $method, $names);
 273                 }
 274
 275
 276                 $sql = sprintf("%s INDEX `%s` (%s)", $method, DBA::escape($indexname), $names);
 277                 return ($sql);
 278         }
 279
 280         /**
 281          * Updates DB structure and returns eventual errors messages
 282          *
 283          * @param string $basePath   The base path of this application
 284          * @param bool   $verbose
 285          * @param bool   $action     Whether to actually apply the update
 286          * @param bool   $install    Is this the initial update during the installation?
 287          * @param array  $tables     An array of the database tables
 288          * @param array  $definition An array of the definition tables
 289          * @return string Empty string if the update is successful, error messages otherwise
 290          * @throws Exception
 291          */
 292         public static function update($basePath, $verbose, $action, $install = false, array $tables = null, array $definition = null)
 293         {
 294                 if ($action && !$install) {
 295                         if (self::isUpdating()) {
 296                                 return DI::l10n()->t('Another database update is currently running.');
 297                         }
 298
 299                         DI::config()->set('system', 'maintenance', 1);
 300                         DI::config()->set('system', 'maintenance_reason', DI::l10n()->t('%s: Database update', DateTimeFormat::utcNow() . ' ' . date('e')));
 301                 }
 302
 303                 // ensure that all initial values exist. This test has to be done prior and after the structure check.
 304                 // Prior is needed if the specific tables already exists - after is needed when they had been created.
 305                 self::checkInitialValues();
 306
 307                 $errors = '';
 308
 309                 Logger::log('updating structure', Logger::DEBUG);
 310
 311                 // Get the current structure
 312                 $database = [];
 313
 314                 if (is_null($tables)) {
 315                         $tables = DBA::toArray(DBA::p("SHOW TABLES"));
 316                 }
 317
 318                 if (DBA::isResult($tables)) {
 319                         foreach ($tables AS $table) {
 320                                 $table = current($table);
 321
 322                                 Logger::log(sprintf('updating structure for table %s ...', $table), Logger::DEBUG);
 323                                 $database[$table] = self::tableStructure($table);
 324                         }
 325                 }
 326
 327                 // Get the definition
 328                 if (is_null($definition)) {
 329                         $definition = self::definition($basePath);
 330                 }
 331
 332                 // MySQL >= 5.7.4 doesn't support the IGNORE keyword in ALTER TABLE statements
 333                 if ((version_compare(DBA::serverInfo(), '5.7.4') >= 0) &&
 334                         !(strpos(DBA::serverInfo(), 'MariaDB') !== false)) {
 335                         $ignore = '';
 336                 } else {
 337                         $ignore = ' IGNORE';
 338                 }
 339
 340                 // Compare it
 341                 foreach ($definition AS $name => $structure) {
 342                         $is_new_table = false;
 343                         $group_by = "";
 344                         $sql3 = "";
 345                         $is_unique = false;
 346                         $temp_name = $name;
 347                         if (!isset($database[$name])) {
 348                                 $r = self::createTable($name, $structure, $verbose, $action);
 349                                 if (!DBA::isResult($r)) {
 350                                         $errors .= self::printUpdateError($name);
 351                                 }
 352                                 $is_new_table = true;
 353                         } else {
 354                                 foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 355                                         if (isset($database[$name]["indexes"][$indexname])) {
 356                                                 $current_index_definition = implode(",", $database[$name]["indexes"][$indexname]);
 357                                         } else {
 358                                                 $current_index_definition = "__NOT_SET__";
 359                                         }
 360                                         $new_index_definition = implode(",", $fieldnames);
 361                                         if ($current_index_definition != $new_index_definition) {
 362                                                 if ($fieldnames[0] == "UNIQUE") {
 363                                                         $is_unique = true;
 364                                                         if ($ignore == "") {
 365                                                                 $temp_name = "temp-" . $name;
 366                                                         }
 367                                                 }
 368                                         }
 369                                 }
 370
 371                                 /*
 372                                  * Drop the index if it isn't present in the definition
 373                                  * or the definition differ from current status
 374                                  * and index name doesn't start with "local_"
 375                                  */
 376                                 foreach ($database[$name]["indexes"] as $indexname => $fieldnames) {
 377                                         $current_index_definition = implode(",", $fieldnames);
 378                                         if (isset($structure["indexes"][$indexname])) {
 379                                                 $new_index_definition = implode(",", $structure["indexes"][$indexname]);
 380                                         } else {
 381                                                 $new_index_definition = "__NOT_SET__";
 382                                         }
 383                                         if ($current_index_definition != $new_index_definition && substr($indexname, 0, 6) != 'local_') {
 384                                                 $sql2 = self::dropIndex($indexname);
 385                                                 if ($sql3 == "") {
 386                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 387                                                 } else {
 388                                                         $sql3 .= ", " . $sql2;
 389                                                 }
 390                                         }
 391                                 }
 392                                 // Compare the field structure field by field
 393                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 394                                         if (!isset($database[$name]["fields"][$fieldname])) {
 395                                                 $sql2 = self::addTableField($fieldname, $parameters);
 396                                                 if ($sql3 == "") {
 397                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 398                                                 } else {
 399                                                         $sql3 .= ", " . $sql2;
 400                                                 }
 401                                         } else {
 402                                                 // Compare the field definition
 403                                                 $field_definition = $database[$name]["fields"][$fieldname];
 404
 405                                                 // Remove the relation data that is used for the referential integrity
 406                                                 unset($parameters['relation']);
 407                                                 unset($parameters['foreign']);
 408
 409                                                 // We change the collation after the indexes had been changed.
 410                                                 // This is done to avoid index length problems.
 411                                                 // So here we always ensure that there is no need to change it.
 412                                                 unset($parameters['Collation']);
 413                                                 unset($field_definition['Collation']);
 414
 415                                                 // Only update the comment when it is defined
 416                                                 if (!isset($parameters['comment'])) {
 417                                                         $parameters['comment'] = "";
 418                                                 }
 419
 420                                                 $current_field_definition = DBA::cleanQuery(implode(",", $field_definition));
 421                                                 $new_field_definition = DBA::cleanQuery(implode(",", $parameters));
 422                                                 if ($current_field_definition != $new_field_definition) {
 423                                                         $sql2 = self::modifyTableField($fieldname, $parameters);
 424                                                         if ($sql3 == "") {
 425                                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 426                                                         } else {
 427                                                                 $sql3 .= ", " . $sql2;
 428                                                         }
 429                                                 }
 430                                         }
 431                                 }
 432                         }
 433
 434                         /*
 435                          * Create the index if the index don't exists in database
 436                          * or the definition differ from the current status.
 437                          * Don't create keys if table is new
 438                          */
 439                         if (!$is_new_table) {
 440                                 foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 441                                         if (isset($database[$name]["indexes"][$indexname])) {
 442                                                 $current_index_definition = implode(",", $database[$name]["indexes"][$indexname]);
 443                                         } else {
 444                                                 $current_index_definition = "__NOT_SET__";
 445                                         }
 446                                         $new_index_definition = implode(",", $fieldnames);
 447                                         if ($current_index_definition != $new_index_definition) {
 448                                                 $sql2 = self::createIndex($indexname, $fieldnames);
 449
 450                                                 // Fetch the "group by" fields for unique indexes
 451                                                 $group_by = self::groupBy($fieldnames);
 452                                                 if ($sql2 != "") {
 453                                                         if ($sql3 == "") {
 454                                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 455                                                         } else {
 456                                                                 $sql3 .= ", " . $sql2;
 457                                                         }
 458                                                 }
 459                                         }
 460                                 }
 461
 462                                 $existing_foreign_keys = $database[$name]['foreign_keys'];
 463
 464                                 // Foreign keys
 465                                 // Compare the field structure field by field
 466                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 467                                         if (empty($parameters['foreign'])) {
 468                                                 continue;
 469                                         }
 470
 471                                         $constraint = self::getConstraintName($name, $fieldname, $parameters);
 472
 473                                         unset($existing_foreign_keys[$constraint]);
 474
 475                                         if (empty($database[$name]['foreign_keys'][$constraint])) {
 476                                                 $sql2 = self::addForeignKey($name, $fieldname, $parameters);
 477
 478                                                 if ($sql3 == "") {
 479                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 480                                                 } else {
 481                                                         $sql3 .= ", " . $sql2;
 482                                                 }
 483                                         }
 484                                 }
 485
 486                                 foreach ($existing_foreign_keys as $constraint => $param) {
 487                                         $sql2 = self::dropForeignKey($constraint);
 488
 489                                         if ($sql3 == "") {
 490                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 491                                         } else {
 492                                                 $sql3 .= ", " . $sql2;
 493                                         }
 494                                 }
 495
 496                                 if (isset($database[$name]["table_status"]["TABLE_COMMENT"])) {
 497                                         $structurecomment = $structure["comment"] ?? '';
 498                                         if ($database[$name]["table_status"]["TABLE_COMMENT"] != $structurecomment) {
 499                                                 $sql2 = "COMMENT = '" . DBA::escape($structurecomment) . "'";
 500
 501                                                 if ($sql3 == "") {
 502                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 503                                                 } else {
 504                                                         $sql3 .= ", " . $sql2;
 505                                                 }
 506                                         }
 507                                 }
 508
 509                                 if (isset($database[$name]["table_status"]["ENGINE"]) && isset($structure['engine'])) {
 510                                         if ($database[$name]["table_status"]["ENGINE"] != $structure['engine']) {
 511                                                 $sql2 = "ENGINE = '" . DBA::escape($structure['engine']) . "'";
 512
 513                                                 if ($sql3 == "") {
 514                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 515                                                 } else {
 516                                                         $sql3 .= ", " . $sql2;
 517                                                 }
 518                                         }
 519                                 }
 520
 521                                 if (isset($database[$name]["table_status"]["TABLE_COLLATION"])) {
 522                                         if ($database[$name]["table_status"]["TABLE_COLLATION"] != 'utf8mb4_general_ci') {
 523                                                 $sql2 = "DEFAULT COLLATE utf8mb4_general_ci";
 524
 525                                                 if ($sql3 == "") {
 526                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 527                                                 } else {
 528                                                         $sql3 .= ", " . $sql2;
 529                                                 }
 530                                         }
 531                                 }
 532
 533                                 if ($sql3 != "") {
 534                                         $sql3 .= "; ";
 535                                 }
 536
 537                                 // Now have a look at the field collations
 538                                 // Compare the field structure field by field
 539                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 540                                         // Compare the field definition
 541                                         $field_definition = ($database[$name]["fields"][$fieldname] ?? '') ?: ['Collation' => ''];
 542
 543                                         // Define the default collation if not given
 544                                         if (!isset($parameters['Collation']) && !empty($field_definition['Collation'])) {
 545                                                 $parameters['Collation'] = 'utf8mb4_general_ci';
 546                                         } else {
 547                                                 $parameters['Collation'] = null;
 548                                         }
 549
 550                                         if ($field_definition['Collation'] != $parameters['Collation']) {
 551                                                 $sql2 = self::modifyTableField($fieldname, $parameters);
 552                                                 if (($sql3 == "") || (substr($sql3, -2, 2) == "; ")) {
 553                                                         $sql3 .= "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 554                                                 } else {
 555                                                         $sql3 .= ", " . $sql2;
 556                                                 }
 557                                         }
 558                                 }
 559                         }
 560
 561                         if ($sql3 != "") {
 562                                 if (substr($sql3, -2, 2) != "; ") {
 563                                         $sql3 .= ";";
 564                                 }
 565
 566                                 $field_list = '';
 567                                 if ($is_unique && $ignore == '') {
 568                                         foreach ($database[$name]["fields"] AS $fieldname => $parameters) {
 569                                                 $field_list .= 'ANY_VALUE(`' . $fieldname . '`),';
 570                                         }
 571                                         $field_list = rtrim($field_list, ',');
 572                                 }
 573
 574                                 if ($verbose) {
 575                                         // Ensure index conversion to unique removes duplicates
 576                                         if ($is_unique && ($temp_name != $name)) {
 577                                                 if ($ignore != "") {
 578                                                         echo "SET session old_alter_table=1;\n";
 579                                                 } else {
 580                                                         echo "DROP TABLE IF EXISTS `" . $temp_name . "`;\n";
 581                                                         echo "CREATE TABLE `" . $temp_name . "` LIKE `" . $name . "`;\n";
 582                                                 }
 583                                         }
 584
 585                                         echo $sql3 . "\n";
 586
 587                                         if ($is_unique && ($temp_name != $name)) {
 588                                                 if ($ignore != "") {
 589                                                         echo "SET session old_alter_table=0;\n";
 590                                                 } else {
 591                                                         echo "INSERT INTO `" . $temp_name . "` SELECT " . DBA::anyValueFallback($field_list) . " FROM `" . $name . "`" . $group_by . ";\n";
 592                                                         echo "DROP TABLE `" . $name . "`;\n";
 593                                                         echo "RENAME TABLE `" . $temp_name . "` TO `" . $name . "`;\n";
 594                                                 }
 595                                         }
 596                                 }
 597
 598                                 if ($action) {
 599                                         if (!$install) {
 600                                                 DI::config()->set('system', 'maintenance_reason', DI::l10n()->t('%s: updating %s table.', DateTimeFormat::utcNow() . ' ' . date('e'), $name));
 601                                         }
 602
 603                                         // Ensure index conversion to unique removes duplicates
 604                                         if ($is_unique && ($temp_name != $name)) {
 605                                                 if ($ignore != "") {
 606                                                         DBA::e("SET session old_alter_table=1;");
 607                                                 } else {
 608                                                         $r = DBA::e("DROP TABLE IF EXISTS `" . $temp_name . "`;");
 609                                                         if (!DBA::isResult($r)) {
 610                                                                 $errors .= self::printUpdateError($sql3);
 611                                                                 return $errors;
 612                                                         }
 613
 614                                                         $r = DBA::e("CREATE TABLE `" . $temp_name . "` LIKE `" . $name . "`;");
 615                                                         if (!DBA::isResult($r)) {
 616                                                                 $errors .= self::printUpdateError($sql3);
 617                                                                 return $errors;
 618                                                         }
 619                                                 }
 620                                         }
 621
 622                                         $r = DBA::e($sql3);
 623                                         if (!DBA::isResult($r)) {
 624                                                 $errors .= self::printUpdateError($sql3);
 625                                         }
 626                                         if ($is_unique && ($temp_name != $name)) {
 627                                                 if ($ignore != "") {
 628                                                         DBA::e("SET session old_alter_table=0;");
 629                                                 } else {
 630                                                         $r = DBA::e("INSERT INTO `" . $temp_name . "` SELECT " . $field_list . " FROM `" . $name . "`" . $group_by . ";");
 631                                                         if (!DBA::isResult($r)) {
 632                                                                 $errors .= self::printUpdateError($sql3);
 633                                                                 return $errors;
 634                                                         }
 635                                                         $r = DBA::e("DROP TABLE `" . $name . "`;");
 636                                                         if (!DBA::isResult($r)) {
 637                                                                 $errors .= self::printUpdateError($sql3);
 638                                                                 return $errors;
 639                                                         }
 640                                                         $r = DBA::e("RENAME TABLE `" . $temp_name . "` TO `" . $name . "`;");
 641                                                         if (!DBA::isResult($r)) {
 642                                                                 $errors .= self::printUpdateError($sql3);
 643                                                                 return $errors;
 644                                                         }
 645                                                 }
 646                                         }
 647                                 }
 648                         }
 649                 }
 650
 651                 View::create(false, $action);
 652
 653                 self::checkInitialValues();
 654
 655                 if ($action && !$install) {
 656                         DI::config()->set('system', 'maintenance', 0);
 657                         DI::config()->set('system', 'maintenance_reason', '');
 658
 659                         if ($errors) {
 660                                 DI::config()->set('system', 'dbupdate', self::UPDATE_FAILED);
 661                         } else {
 662                                 DI::config()->set('system', 'dbupdate', self::UPDATE_SUCCESSFUL);
 663                         }
 664                 }
 665
 666                 return $errors;
 667         }
 668
 669         private static function tableStructure($table)
 670         {
 671                 // This query doesn't seem to be executable as a prepared statement
 672                 $indexes = DBA::toArray(DBA::p("SHOW INDEX FROM " . DBA::quoteIdentifier($table)));
 673
 674                 $fields = DBA::selectToArray(['INFORMATION_SCHEMA' => 'COLUMNS'],
 675                         ['COLUMN_NAME', 'COLUMN_TYPE', 'IS_NULLABLE', 'COLUMN_DEFAULT', 'EXTRA',
 676                         'COLUMN_KEY', 'COLLATION_NAME', 'COLUMN_COMMENT'],
 677                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ?",
 678                         DBA::databaseName(), $table]);
 679
 680                 $foreign_keys = DBA::selectToArray(['INFORMATION_SCHEMA' => 'KEY_COLUMN_USAGE'],
 681                         ['COLUMN_NAME', 'CONSTRAINT_NAME', 'REFERENCED_TABLE_NAME', 'REFERENCED_COLUMN_NAME'],
 682                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ? AND `REFERENCED_TABLE_SCHEMA` IS NOT NULL",
 683                         DBA::databaseName(), $table]);
 684
 685                 $table_status = DBA::selectFirst(['INFORMATION_SCHEMA' => 'TABLES'],
 686                         ['ENGINE', 'TABLE_COLLATION', 'TABLE_COMMENT'],
 687                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ?",
 688                         DBA::databaseName(), $table]);
 689
 690                 $fielddata = [];
 691                 $indexdata = [];
 692                 $foreigndata = [];
 693
 694                 if (DBA::isResult($foreign_keys)) {
 695                         foreach ($foreign_keys as $foreign_key) {
 696                                 $constraint = $foreign_key['CONSTRAINT_NAME'];
 697                                 unset($foreign_key['CONSTRAINT_NAME']);
 698                                 $foreigndata[$constraint] = $foreign_key;
 699                         }
 700                 }
 701
 702                 if (DBA::isResult($indexes)) {
 703                         foreach ($indexes AS $index) {
 704                                 if ($index["Key_name"] != "PRIMARY" && $index["Non_unique"] == "0" && !isset($indexdata[$index["Key_name"]])) {
 705                                         $indexdata[$index["Key_name"]] = ["UNIQUE"];
 706                                 }
 707
 708                                 if ($index["Index_type"] == "FULLTEXT" && !isset($indexdata[$index["Key_name"]])) {
 709                                         $indexdata[$index["Key_name"]] = ["FULLTEXT"];
 710                                 }
 711
 712                                 $column = $index["Column_name"];
 713
 714                                 if ($index["Sub_part"] != "") {
 715                                         $column .= "(" . $index["Sub_part"] . ")";
 716                                 }
 717
 718                                 $indexdata[$index["Key_name"]][] = $column;
 719                         }
 720                 }
 721
 722                 $fielddata = [];
 723                 if (DBA::isResult($fields)) {
 724                         foreach ($fields AS $field) {
 725                                 $search = ['tinyint(1)', 'tinyint(3) unsigned', 'tinyint(4)', 'smallint(5) unsigned', 'smallint(6)', 'mediumint(8) unsigned', 'mediumint(9)', 'bigint(20)', 'int(10) unsigned', 'int(11)'];
 726                                 $replace = ['boolean', 'tinyint unsigned', 'tinyint', 'smallint unsigned', 'smallint', 'mediumint unsigned', 'mediumint', 'bigint', 'int unsigned', 'int'];
 727                                 $field['COLUMN_TYPE'] = str_replace($search, $replace, $field['COLUMN_TYPE']);
 728
 729                                 $fielddata[$field['COLUMN_NAME']]['type'] = $field['COLUMN_TYPE'];
 730
 731                                 if ($field['IS_NULLABLE'] == 'NO') {
 732                                         $fielddata[$field['COLUMN_NAME']]['not null'] = true;
 733                                 }
 734
 735                                 if (isset($field['COLUMN_DEFAULT'])) {
 736                                         $fielddata[$field['COLUMN_NAME']]['default'] = $field['COLUMN_DEFAULT'];
 737                                 }
 738
 739                                 if (!empty($field['EXTRA'])) {
 740                                         $fielddata[$field['COLUMN_NAME']]['extra'] = $field['EXTRA'];
 741                                 }
 742
 743                                 if ($field['COLUMN_KEY'] == 'PRI') {
 744                                         $fielddata[$field['COLUMN_NAME']]['primary'] = true;
 745                                 }
 746
 747                                 $fielddata[$field['COLUMN_NAME']]['Collation'] = $field['COLLATION_NAME'];
 748                                 $fielddata[$field['COLUMN_NAME']]['comment'] = $field['COLUMN_COMMENT'];
 749                         }
 750                 }
 751
 752                 return ["fields" => $fielddata, "indexes" => $indexdata,
 753                         "foreign_keys" => $foreigndata, "table_status" => $table_status];
 754         }
 755
 756         private static function dropIndex($indexname)
 757         {
 758                 $sql = sprintf("DROP INDEX `%s`", DBA::escape($indexname));
 759                 return ($sql);
 760         }
 761
 762         private static function addTableField($fieldname, $parameters)
 763         {
 764                 $sql = sprintf("ADD `%s` %s", DBA::escape($fieldname), self::FieldCommand($parameters));
 765                 return ($sql);
 766         }
 767
 768         private static function modifyTableField($fieldname, $parameters)
 769         {
 770                 $sql = sprintf("MODIFY `%s` %s", DBA::escape($fieldname), self::FieldCommand($parameters, false));
 771                 return ($sql);
 772         }
 773
 774         private static function getConstraintName(string $tablename, string $fieldname, array $parameters)
 775         {
 776                 $foreign_table = array_keys($parameters['foreign'])[0];
 777                 $foreign_field = array_values($parameters['foreign'])[0];
 778
 779                 return $tablename . "-" . $fieldname. "-" . $foreign_table. "-" . $foreign_field;
 780         }
 781
 782         private static function foreignCommand(string $tablename, string $fieldname, array $parameters) {
 783                 $foreign_table = array_keys($parameters['foreign'])[0];
 784                 $foreign_field = array_values($parameters['foreign'])[0];
 785
 786                 $constraint = self::getConstraintName($tablename, $fieldname, $parameters);
 787
 788                 $sql = "CONSTRAINT `" . $constraint . "` FOREIGN KEY (`" . $fieldname . "`)" .
 789                         " REFERENCES `" . $foreign_table . "` (`" . $foreign_field . "`)";
 790
 791                 if (!empty($parameters['foreign']['on update'])) {
 792                         $sql .= " ON UPDATE " . strtoupper($parameters['foreign']['on update']);
 793                 } else {
 794                         $sql .= " ON UPDATE RESTRICT";
 795                 }
 796
 797                 if (!empty($parameters['foreign']['on delete'])) {
 798                         $sql .= " ON DELETE " . strtoupper($parameters['foreign']['on delete']);
 799                 } else {
 800                         $sql .= " ON DELETE CASCADE";
 801                 }
 802
 803                 return $sql;
 804         }
 805
 806         private static function addForeignKey(string $tablename, string $fieldname, array $parameters)
 807         {
 808                 return sprintf("ADD %s", self::foreignCommand($tablename, $fieldname, $parameters));
 809         }
 810
 811         private static function dropForeignKey(string $constraint)
 812         {
 813                 return sprintf("DROP FOREIGN KEY `%s`", $constraint);
 814         }
 815
 816         /**
 817          * Constructs a GROUP BY clause from a UNIQUE index definition.
 818          *
 819          * @param array $fieldnames
 820          * @return string
 821          */
 822         private static function groupBy(array $fieldnames)
 823         {
 824                 if ($fieldnames[0] != "UNIQUE") {
 825                         return "";
 826                 }
 827
 828                 array_shift($fieldnames);
 829
 830                 $names = "";
 831                 foreach ($fieldnames AS $fieldname) {
 832                         if ($names != "") {
 833                                 $names .= ",";
 834                         }
 835
 836                         if (preg_match('|(.+)\((\d+)\)|', $fieldname, $matches)) {
 837                                 $names .= "`" . DBA::escape($matches[1]) . "`";
 838                         } else {
 839                                 $names .= "`" . DBA::escape($fieldname) . "`";
 840                         }
 841                 }
 842
 843                 $sql = sprintf(" GROUP BY %s", $names);
 844                 return $sql;
 845         }
 846
 847         /**
 848          * Renames columns or the primary key of a table
 849          *
 850          * @todo You cannot rename a primary key if "auto increment" is set
 851          *
 852          * @param string $table            Table name
 853          * @param array  $columns          Columns Syntax for Rename: [ $old1 => [ $new1, $type1 ], $old2 => [ $new2, $type2 ], ... ]
 854          *                                 Syntax for Primary Key: [ $col1, $col2, ...]
 855          * @param int    $type             The type of renaming (Default is Column)
 856          *
 857          * @return boolean Was the renaming successful?
 858          * @throws Exception
 859          */
 860         public static function rename($table, $columns, $type = self::RENAME_COLUMN)
 861         {
 862                 if (empty($table) || empty($columns)) {
 863                         return false;
 864                 }
 865
 866                 if (!is_array($columns)) {
 867                         return false;
 868                 }
 869
 870                 $table = DBA::escape($table);
 871
 872                 $sql = "ALTER TABLE `" . $table . "`";
 873                 switch ($type) {
 874                         case self::RENAME_COLUMN:
 875                                 if (!self::existsColumn($table, array_keys($columns))) {
 876                                         return false;
 877                                 }
 878                                 $sql .= implode(',', array_map(
 879                                         function ($to, $from) {
 880                                                 return " CHANGE `" . $from . "` `" . $to[0] . "` " . $to[1];
 881                                         },
 882                                         $columns,
 883                                         array_keys($columns)
 884                                 ));
 885                                 break;
 886                         case self::RENAME_PRIMARY_KEY:
 887                                 if (!self::existsColumn($table, $columns)) {
 888                                         return false;
 889                                 }
 890                                 $sql .= " DROP PRIMARY KEY, ADD PRIMARY KEY(`" . implode('`, `', $columns) . "`)";
 891                                 break;
 892                         default:
 893                                 return false;
 894                 }
 895
 896                 $sql .= ";";
 897
 898                 $stmt = DBA::p($sql);
 899
 900                 if (is_bool($stmt)) {
 901                         $retval = $stmt;
 902                 } else {
 903                         $retval = true;
 904                 }
 905
 906                 DBA::close($stmt);
 907
 908                 return $retval;
 909         }
 910
 911         /**
 912          *    Check if the columns of the table exists
 913          *
 914          * @param string $table   Table name
 915          * @param array  $columns Columns to check ( Syntax: [ $col1, $col2, .. ] )
 916          *
 917          * @return boolean Does the table exist?
 918          * @throws Exception
 919          */
 920         public static function existsColumn($table, $columns = [])
 921         {
 922                 if (empty($table)) {
 923                         return false;
 924                 }
 925
 926                 if (is_null($columns) || empty($columns)) {
 927                         return self::existsTable($table);
 928                 }
 929
 930                 $table = DBA::escape($table);
 931
 932                 foreach ($columns AS $column) {
 933                         $sql = "SHOW COLUMNS FROM `" . $table . "` LIKE '" . $column . "';";
 934
 935                         $stmt = DBA::p($sql);
 936
 937                         if (is_bool($stmt)) {
 938                                 $retval = $stmt;
 939                         } else {
 940                                 $retval = (DBA::numRows($stmt) > 0);
 941                         }
 942
 943                         DBA::close($stmt);
 944
 945                         if (!$retval) {
 946                                 return false;
 947                         }
 948                 }
 949
 950                 return true;
 951         }
 952
 953         /**
 954          * Check if a foreign key exists for the given table field
 955          *
 956          * @param string $table
 957          * @param string $field
 958          * @return boolean
 959          */
 960         public static function existsForeignKeyForField(string $table, string $field)
 961         {
 962                 return DBA::exists(['INFORMATION_SCHEMA' => 'KEY_COLUMN_USAGE'],
 963                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ? AND `COLUMN_NAME` = ? AND `REFERENCED_TABLE_SCHEMA` IS NOT NULL",
 964                         DBA::databaseName(), $table, $field]);
 965         }
 966         /**
 967          *    Check if a table exists
 968          *
 969          * @param string|array $table Table name
 970          *
 971          * @return boolean Does the table exist?
 972          * @throws Exception
 973          */
 974         public static function existsTable($table)
 975         {
 976                 if (empty($table)) {
 977                         return false;
 978                 }
 979
 980                 if (is_array($table)) {
 981                         $condition = ['table_schema' => key($table), 'table_name' => current($table)];
 982                 } else {
 983                         $condition = ['table_schema' => DBA::databaseName(), 'table_name' => $table];
 984                 }
 985
 986                 $result = DBA::exists(['information_schema' => 'tables'], $condition);
 987
 988                 return $result;
 989         }
 990
 991         /**
 992          * Returns the columns of a table
 993          *
 994          * @param string $table Table name
 995          *
 996          * @return array An array of the table columns
 997          * @throws Exception
 998          */
 999         public static function getColumns($table)
1000         {
1001                 $stmtColumns = DBA::p("SHOW COLUMNS FROM `" . $table . "`");
1002                 return DBA::toArray($stmtColumns);
1003         }
1004
1005         /**
1006          * Check if initial database values do exist - or create them
1007          */
1008         public static function checkInitialValues()
1009         {
1010                 if (self::existsTable('contact') && !DBA::exists('contact', ['id' => 0])) {
1011                         DBA::insert('contact', ['nurl' => '']);
1012                         $lastid = DBA::lastInsertId();
1013                         if ($lastid != 0) {
1014                                 DBA::update('contact', ['id' => 0], ['id' => $lastid]);
1015                         }
1016                 }
1017
1018                 if (self::existsTable('permissionset')) {
1019                         if (!DBA::exists('permissionset', ['id' => 0])) {
1020                                 DBA::insert('permissionset', ['allow_cid' => '', 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '']);
1021                                 $lastid = DBA::lastInsertId();
1022                                 if ($lastid != 0) {
1023                                         DBA::update('permissionset', ['id' => 0], ['id' => $lastid]);
1024                                 }
1025                         }
1026                         if (!self::existsForeignKeyForField('item', 'psid')) {
1027                                 $sets = DBA::p("SELECT `psid`, `item`.`uid`, `item`.`private` FROM `item`
1028                                         LEFT JOIN `permissionset` ON `permissionset`.`id` = `item`.`psid`
1029                                         WHERE `permissionset`.`id` IS NULL AND NOT `psid` IS NULL");
1030                                 while ($set = DBA::fetch($sets)) {
1031                                         if (($set['private'] == Item::PRIVATE) && ($set['uid'] != 0)) {
1032                                                 $owner = User::getOwnerDataById($set['uid']);
1033                                                 if ($owner) {
1034                                                         $permission = '<' . $owner['id'] . '>';
1035                                                 } else {
1036                                                         $permission = '<>';
1037                                                 }
1038                                         } else {
1039                                                 $permission = '';
1040                                         }
1041                                         $fields = ['id' => $set['psid'], 'uid' => $set['uid'], 'allow_cid' => $permission,
1042                                                 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => ''];
1043                                         DBA::insert('permissionset', $fields);
1044                                 }
1045                                 DBA::close($sets);
1046                         }
1047                 }
1048
1049                 if (self::existsTable('tag') && !DBA::exists('tag', ['id' => 0])) {
1050                         DBA::insert('tag', ['name' => '']);
1051                         $lastid = DBA::lastInsertId();
1052                         if ($lastid != 0) {
1053                                 DBA::update('tag', ['id' => 0], ['id' => $lastid]);
1054                         }
1055                 }
1056
1057                 if (!self::existsForeignKeyForField('tokens', 'client_id')) {
1058                         $tokens = DBA::p("SELECT `tokens`.`id` FROM `tokens`
1059                                 LEFT JOIN `clients` ON `clients`.`client_id` = `tokens`.`client_id`
1060                                 WHERE `clients`.`client_id` IS NULL");
1061                         while ($token = DBA::fetch($tokens)) {
1062                                 DBA::delete('tokens', ['id' => $token['id']]);
1063                         }
1064                         DBA::close($tokens);
1065                 }
1066         }
1067
1068         /**
1069          * Checks if a database update is currently running
1070          *
1071          * @return boolean
1072          */
1073         private static function isUpdating()
1074         {
1075                 $isUpdate = false;
1076
1077                 $processes = DBA::select(['information_schema' => 'processlist'], ['info'],
1078                         ['db' => DBA::databaseName(), 'command' => ['Query', 'Execute']]);
1079
1080                 while ($process = DBA::fetch($processes)) {
1081                         $parts = explode(' ', $process['info']);
1082                         if (in_array(strtolower(array_shift($parts)), ['alter', 'create', 'drop', 'rename'])) {
1083                                 $isUpdate = true;
1084                         }
1085                 }
1086
1087                 DBA::close($processes);
1088
1089                 return $isUpdate;
1090         }
1091 }