src/Database/DBStructure.php

   1 <?php
   2 /**
   3  * @copyright Copyright (C) 2010-2021, the Friendica project
   4  *
   5  * @license GNU AGPL version 3 or any later version
   6  *
   7  * This program is free software: you can redistribute it and/or modify
   8  * it under the terms of the GNU Affero General Public License as
   9  * published by the Free Software Foundation, either version 3 of the
  10  * License, or (at your option) any later version.
  11  *
  12  * This program is distributed in the hope that it will be useful,
  13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15  * GNU Affero General Public License for more details.
  16  *
  17  * You should have received a copy of the GNU Affero General Public License
  18  * along with this program.  If not, see <https://www.gnu.org/licenses/>.
  19  *
  20  */
  21
  22 namespace Friendica\Database;
  23
  24 use Exception;
  25 use Friendica\Core\Hook;
  26 use Friendica\Core\Logger;
  27 use Friendica\Core\Renderer;
  28 use Friendica\DI;
  29 use Friendica\Model\Item;
  30 use Friendica\Model\User;
  31 use Friendica\Util\DateTimeFormat;
  32
  33 /**
  34  * This class contains functions that doesn't need to know if pdo, mysqli or whatever is used.
  35  */
  36 class DBStructure
  37 {
  38         const UPDATE_NOT_CHECKED = 0; // Database check wasn't executed before
  39         const UPDATE_SUCCESSFUL  = 1; // Database check was successful
  40         const UPDATE_FAILED      = 2; // Database check failed
  41
  42         const RENAME_COLUMN      = 0;
  43         const RENAME_PRIMARY_KEY = 1;
  44
  45         /**
  46          * Database structure definition loaded from config/dbstructure.config.php
  47          *
  48          * @var array
  49          */
  50         private static $definition = [];
  51
  52         /**
  53          * Set a database version to trigger update functions
  54          *
  55          * @param string $version
  56          * @return void
  57          */
  58         public static function setDatabaseVersion(string $version)
  59         {
  60                 if (!is_numeric($version)) {
  61                         throw new \Asika\SimpleConsole\CommandArgsException('The version number must be numeric');
  62                 }
  63
  64                 DI::config()->set('system', 'build', $version);
  65                 echo DI::l10n()->t('The database version had been set to %s.', $version);
  66         }
  67
  68         /**
  69          * Drop unused tables
  70          *
  71          * @param boolean $execute
  72          * @return void
  73          */
  74         public static function dropTables(bool $execute)
  75         {
  76                 $postupdate = DI::config()->get("system", "post_update_version", PostUpdate::VERSION);
  77                 if ($postupdate < PostUpdate::VERSION) {
  78                         echo DI::l10n()->t('The post update is at version %d, it has to be at %d to safely drop the tables.', $postupdate, PostUpdate::VERSION);
  79                         return;
  80                 }
  81
  82                 $old_tables = ['fserver', 'gcign', 'gcontact', 'gcontact-relation', 'gfollower' ,'glink', 'item-delivery-data',
  83                         'item-activity', 'item-content', 'item_id', 'participation', 'poll', 'poll_result', 'queue', 'retriever_rule',
  84                         'deliverq', 'dsprphotoq', 'ffinder', 'sign', 'spam', 'term', 'user-item', 'thread', 'item', 'challenge',
  85                         'auth_codes', 'clients', 'tokens', 'profile_check'];
  86
  87                 $tables = DBA::selectToArray(['INFORMATION_SCHEMA' => 'TABLES'], ['TABLE_NAME'],
  88                         ['TABLE_SCHEMA' => DBA::databaseName(), 'TABLE_TYPE' => 'BASE TABLE']);
  89
  90                 if (empty($tables)) {
  91                         echo DI::l10n()->t('No unused tables found.');
  92                         return;
  93                 }
  94
  95                 if (!$execute) {
  96                         echo DI::l10n()->t('These tables are not used for friendica and will be deleted when you execute "dbstructure drop -e":') . "\n\n";
  97                 }
  98
  99                 foreach ($tables as $table) {
 100                         if (in_array($table['TABLE_NAME'], $old_tables)) {
 101                                 if ($execute) {
 102                                         $sql = 'DROP TABLE ' . DBA::quoteIdentifier($table['TABLE_NAME']) . ';';
 103                                         echo $sql . "\n";
 104
 105                                         $result = DBA::e($sql);
 106                                         if (!DBA::isResult($result)) {
 107                                                 self::printUpdateError($sql);
 108                                         }
 109                                 } else {
 110                                         echo $table['TABLE_NAME'] . "\n";
 111                                 }
 112                         }
 113                 }
 114         }
 115
 116         /**
 117          * Converts all tables from MyISAM/InnoDB Antelope to InnoDB Barracuda
 118          */
 119         public static function convertToInnoDB()
 120         {
 121                 $tables = DBA::selectToArray(
 122                         ['information_schema' => 'tables'],
 123                         ['table_name'],
 124                         ['engine' => 'MyISAM', 'table_schema' => DBA::databaseName()]
 125                 );
 126
 127                 $tables = array_merge($tables, DBA::selectToArray(
 128                         ['information_schema' => 'tables'],
 129                         ['table_name'],
 130                         ['engine' => 'InnoDB', 'ROW_FORMAT' => ['COMPACT', 'REDUNDANT'], 'table_schema' => DBA::databaseName()]
 131                 ));
 132
 133                 if (!DBA::isResult($tables)) {
 134                         echo DI::l10n()->t('There are no tables on MyISAM or InnoDB with the Antelope file format.') . "\n";
 135                         return;
 136                 }
 137
 138                 foreach ($tables AS $table) {
 139                         $sql = "ALTER TABLE " . DBA::quoteIdentifier($table['table_name']) . " ENGINE=InnoDB ROW_FORMAT=DYNAMIC;";
 140                         echo $sql . "\n";
 141
 142                         $result = DBA::e($sql);
 143                         if (!DBA::isResult($result)) {
 144                                 self::printUpdateError($sql);
 145                         }
 146                 }
 147         }
 148
 149         /**
 150          * Print out database error messages
 151          *
 152          * @param string $message Message to be added to the error message
 153          *
 154          * @return string Error message
 155          */
 156         private static function printUpdateError($message)
 157         {
 158                 echo DI::l10n()->t("\nError %d occurred during database update:\n%s\n",
 159                         DBA::errorNo(), DBA::errorMessage());
 160
 161                 return DI::l10n()->t('Errors encountered performing database changes: ') . $message . EOL;
 162         }
 163
 164         public static function writeStructure()
 165         {
 166                 $tables = [];
 167                 foreach (self::definition(null) as $name => $definition) {
 168                         $indexes  = [[
 169                                 'name'   => 'Name',
 170                                 'fields' => 'Fields',
 171                         ],
 172                         [
 173                                 'name'   => '-',
 174                                 'fields' => '-',
 175                         ]];
 176
 177                         $lengths = ['name' => 4, 'fields' => 6];
 178                         foreach ($definition['indexes'] as $key => $value) {
 179                                 $fieldlist = implode(', ', $value);
 180                                 $indexes[] = ['name' => $key, 'fields' => $fieldlist];
 181                                 $lengths['name']   = max($lengths['name'], strlen($key));
 182                                 $lengths['fields'] = max($lengths['fields'], strlen($fieldlist));
 183                         }
 184
 185                         array_walk_recursive($indexes, function(&$value, $key) use ($lengths)
 186                         {
 187                                 $value = str_pad($value, $lengths[$key], $value === '-' ? '-' : ' ');
 188                         });
 189
 190                         $foreign = [];
 191                         $fields  = [[
 192                                 'name'    => 'Field',
 193                                 'comment' => 'Description',
 194                                 'type'    => 'Type',
 195                                 'null'    => 'Null',
 196                                 'primary' => 'Key',
 197                                 'default' => 'Default',
 198                                 'extra'   => 'Extra',
 199                         ],
 200                         [
 201                                 'name'    => '-',
 202                                 'comment' => '-',
 203                                 'type'    => '-',
 204                                 'null'    => '-',
 205                                 'primary' => '-',
 206                                 'default' => '-',
 207                                 'extra'   => '-',
 208                         ]];
 209                         $lengths = [
 210                                 'name'    => 5,
 211                                 'comment' => 11,
 212                                 'type'    => 4,
 213                                 'null'    => 4,
 214                                 'primary' => 3,
 215                                 'default' => 7,
 216                                 'extra'   => 5,
 217                         ];
 218                         foreach ($definition['fields'] as $key => $value) {
 219                                 $field = [];
 220                                 $field['name']    = $key;
 221                                 $field['comment'] = $value['comment'] ?? '';
 222                                 $field['type']    = $value['type'];
 223                                 $field['null']    = ($value['not null'] ?? false) ? 'NO' : 'YES';
 224                                 $field['primary'] = ($value['primary'] ?? false) ? 'PRI' : '';
 225                                 $field['default'] = $value['default'] ?? 'NULL';
 226                                 $field['extra']   = $value['extra'] ?? '';
 227
 228                                 foreach ($field as $fieldname => $fieldvalue) {
 229                                         $lengths[$fieldname] = max($lengths[$fieldname] ?? 0, strlen($fieldvalue));
 230                                 }
 231                                 $fields[] = $field;
 232
 233                                 if (!empty($value['foreign'])) {
 234                                         $foreign[] = [
 235                                                 'field'       => $key,
 236                                                 'targettable' => array_keys($value['foreign'])[0],
 237                                                 'targetfield' => array_values($value['foreign'])[0]
 238                                         ];
 239                                 }
 240                         }
 241
 242                         array_walk_recursive($fields, function(&$value, $key) use ($lengths)
 243                         {
 244                                 $value = str_pad($value, $lengths[$key], $value === '-' ? '-' : ' ');
 245                         });
 246
 247                         $tables[] = ['name' => $name, 'comment' => $definition['comment']];
 248                         $content = Renderer::replaceMacros(Renderer::getMarkupTemplate('structure.tpl'), [
 249                                 '$name'    => $name,
 250                                 '$comment' => $definition['comment'],
 251                                 '$fields'  => $fields,
 252                                 '$indexes' => $indexes,
 253                                 '$foreign' => $foreign,
 254                         ]);
 255                         $filename = DI::basePath() . '/doc/database/db_' . $name . '.md';
 256                         file_put_contents($filename, $content);
 257                 }
 258                 asort($tables);
 259                 $content = Renderer::replaceMacros(Renderer::getMarkupTemplate('tables.tpl'), [
 260                         '$tables'  => $tables,
 261                 ]);
 262                 $filename = DI::basePath() . '/doc/database.md';
 263                 file_put_contents($filename, $content);
 264         }
 265
 266         public static function printStructure($basePath)
 267         {
 268                 $database = self::definition($basePath, false);
 269
 270                 echo "-- ------------------------------------------\n";
 271                 echo "-- " . FRIENDICA_PLATFORM . " " . FRIENDICA_VERSION . " (" . FRIENDICA_CODENAME, ")\n";
 272                 echo "-- DB_UPDATE_VERSION " . DB_UPDATE_VERSION . "\n";
 273                 echo "-- ------------------------------------------\n\n\n";
 274                 foreach ($database AS $name => $structure) {
 275                         echo "--\n";
 276                         echo "-- TABLE $name\n";
 277                         echo "--\n";
 278                         self::createTable($name, $structure, true, false);
 279
 280                         echo "\n";
 281                 }
 282
 283                 View::printStructure($basePath);
 284         }
 285
 286         /**
 287          * Loads the database structure definition from the static/dbstructure.config.php file.
 288          * On first pass, defines DB_UPDATE_VERSION constant.
 289          *
 290          * @see static/dbstructure.config.php
 291          * @param boolean $with_addons_structure Whether to tack on addons additional tables
 292          * @param string  $basePath              The base path of this application
 293          * @return array
 294          * @throws Exception
 295          */
 296         public static function definition($basePath, $with_addons_structure = true)
 297         {
 298                 if (!self::$definition) {
 299                         if (empty($basePath)) {
 300                                 $basePath = DI::app()->getBasePath();
 301                         }
 302
 303                         $filename = $basePath . '/static/dbstructure.config.php';
 304
 305                         if (!is_readable($filename)) {
 306                                 throw new Exception('Missing database structure config file static/dbstructure.config.php');
 307                         }
 308
 309                         $definition = require $filename;
 310
 311                         if (!$definition) {
 312                                 throw new Exception('Corrupted database structure config file static/dbstructure.config.php');
 313                         }
 314
 315                         self::$definition = $definition;
 316                 } else {
 317                         $definition = self::$definition;
 318                 }
 319
 320                 if ($with_addons_structure) {
 321                         Hook::callAll('dbstructure_definition', $definition);
 322                 }
 323
 324                 return $definition;
 325         }
 326
 327         /**
 328          * Get field data for the given table
 329          *
 330          * @param string $table
 331          * @param array $data data fields
 332          * @return array fields for the given
 333          */
 334         public static function getFieldsForTable(string $table, array $data = [])
 335         {
 336                 $definition = DBStructure::definition('', false);
 337                 if (empty($definition[$table])) {
 338                         return [];
 339                 }
 340
 341                 $fieldnames = array_keys($definition[$table]['fields']);
 342
 343                 $fields = [];
 344
 345                 // Assign all field that are present in the table
 346                 foreach ($fieldnames as $field) {
 347                         if (isset($data[$field])) {
 348                                 // Limit the length of varchar, varbinary, char and binrary fields
 349                                 if (is_string($data[$field]) && preg_match("/char\((\d*)\)/", $definition[$table]['fields'][$field]['type'], $result)) {
 350                                         $data[$field] = mb_substr($data[$field], 0, $result[1]);
 351                                 } elseif (is_string($data[$field]) && preg_match("/binary\((\d*)\)/", $definition[$table]['fields'][$field]['type'], $result)) {
 352                                         $data[$field] = substr($data[$field], 0, $result[1]);
 353                                 }
 354                                 $fields[$field] = $data[$field];
 355                         }
 356                 }
 357
 358                 return $fields;
 359         }
 360
 361         private static function createTable($name, $structure, $verbose, $action)
 362         {
 363                 $r = true;
 364
 365                 $engine = "";
 366                 $comment = "";
 367                 $sql_rows = [];
 368                 $primary_keys = [];
 369                 $foreign_keys = [];
 370
 371                 foreach ($structure["fields"] AS $fieldname => $field) {
 372                         $sql_rows[] = "`" . DBA::escape($fieldname) . "` " . self::FieldCommand($field);
 373                         if (!empty($field['primary'])) {
 374                                 $primary_keys[] = $fieldname;
 375                         }
 376                         if (!empty($field['foreign'])) {
 377                                 $foreign_keys[$fieldname] = $field;
 378                         }
 379                 }
 380
 381                 if (!empty($structure["indexes"])) {
 382                         foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 383                                 $sql_index = self::createIndex($indexname, $fieldnames, "");
 384                                 if (!is_null($sql_index)) {
 385                                         $sql_rows[] = $sql_index;
 386                                 }
 387                         }
 388                 }
 389
 390                 foreach ($foreign_keys AS $fieldname => $parameters) {
 391                         $sql_rows[] = self::foreignCommand($name, $fieldname, $parameters);
 392                 }
 393
 394                 if (isset($structure["engine"])) {
 395                         $engine = " ENGINE=" . $structure["engine"];
 396                 }
 397
 398                 if (isset($structure["comment"])) {
 399                         $comment = " COMMENT='" . DBA::escape($structure["comment"]) . "'";
 400                 }
 401
 402                 $sql = implode(",\n\t", $sql_rows);
 403
 404                 $sql = sprintf("CREATE TABLE IF NOT EXISTS `%s` (\n\t", DBA::escape($name)) . $sql .
 405                         "\n)" . $engine . " DEFAULT COLLATE utf8mb4_general_ci" . $comment;
 406                 if ($verbose) {
 407                         echo $sql . ";\n";
 408                 }
 409
 410                 if ($action) {
 411                         $r = DBA::e($sql);
 412                 }
 413
 414                 return $r;
 415         }
 416
 417         private static function FieldCommand($parameters, $create = true)
 418         {
 419                 $fieldstruct = $parameters["type"];
 420
 421                 if (isset($parameters["Collation"])) {
 422                         $fieldstruct .= " COLLATE " . $parameters["Collation"];
 423                 }
 424
 425                 if (isset($parameters["not null"])) {
 426                         $fieldstruct .= " NOT NULL";
 427                 }
 428
 429                 if (isset($parameters["default"])) {
 430                         if (strpos(strtolower($parameters["type"]), "int") !== false) {
 431                                 $fieldstruct .= " DEFAULT " . $parameters["default"];
 432                         } else {
 433                                 $fieldstruct .= " DEFAULT '" . $parameters["default"] . "'";
 434                         }
 435                 }
 436                 if (isset($parameters["extra"])) {
 437                         $fieldstruct .= " " . $parameters["extra"];
 438                 }
 439
 440                 if (isset($parameters["comment"])) {
 441                         $fieldstruct .= " COMMENT '" . DBA::escape($parameters["comment"]) . "'";
 442                 }
 443
 444                 /*if (($parameters["primary"] != "") && $create)
 445                         $fieldstruct .= " PRIMARY KEY";*/
 446
 447                 return ($fieldstruct);
 448         }
 449
 450         private static function createIndex($indexname, $fieldnames, $method = "ADD")
 451         {
 452                 $method = strtoupper(trim($method));
 453                 if ($method != "" && $method != "ADD") {
 454                         throw new Exception("Invalid parameter 'method' in self::createIndex(): '$method'");
 455                 }
 456
 457                 if (in_array($fieldnames[0], ["UNIQUE", "FULLTEXT"])) {
 458                         $index_type = array_shift($fieldnames);
 459                         $method .= " " . $index_type;
 460                 }
 461
 462                 $names = "";
 463                 foreach ($fieldnames AS $fieldname) {
 464                         if ($names != "") {
 465                                 $names .= ",";
 466                         }
 467
 468                         if (preg_match('|(.+)\((\d+)\)|', $fieldname, $matches)) {
 469                                 $names .= "`" . DBA::escape($matches[1]) . "`(" . intval($matches[2]) . ")";
 470                         } else {
 471                                 $names .= "`" . DBA::escape($fieldname) . "`";
 472                         }
 473                 }
 474
 475                 if ($indexname == "PRIMARY") {
 476                         return sprintf("%s PRIMARY KEY(%s)", $method, $names);
 477                 }
 478
 479
 480                 $sql = sprintf("%s INDEX `%s` (%s)", $method, DBA::escape($indexname), $names);
 481                 return ($sql);
 482         }
 483
 484         /**
 485          * Perform a database structure dryrun (means: just simulating)
 486          *
 487          * @throws Exception
 488          */
 489         public static function dryRun()
 490         {
 491                 self::update(DI::app()->getBasePath(), true, false);
 492         }
 493
 494         /**
 495          * Updates DB structure and returns eventual errors messages
 496          *
 497          * @param bool $enable_maintenance_mode Set the maintenance mode
 498          * @param bool $verbose                 Display the SQL commands
 499          *
 500          * @return string Empty string if the update is successful, error messages otherwise
 501          * @throws Exception
 502          */
 503         public static function performUpdate(bool $enable_maintenance_mode = true, bool $verbose = false)
 504         {
 505                 if ($enable_maintenance_mode) {
 506                         DI::config()->set('system', 'maintenance', 1);
 507                 }
 508
 509                 $status = self::update(DI::app()->getBasePath(), $verbose, true);
 510
 511                 if ($enable_maintenance_mode) {
 512                         DI::config()->set('system', 'maintenance', 0);
 513                         DI::config()->set('system', 'maintenance_reason', '');
 514                 }
 515
 516                 return $status;
 517         }
 518
 519         /**
 520          * Updates DB structure from the installation and returns eventual errors messages
 521          *
 522          * @param string $basePath   The base path of this application
 523          *
 524          * @return string Empty string if the update is successful, error messages otherwise
 525          * @throws Exception
 526          */
 527         public static function install(string $basePath)
 528         {
 529                 return self::update($basePath, false, true, true);
 530         }
 531
 532         /**
 533          * Updates DB structure and returns eventual errors messages
 534          *
 535          * @param string $basePath   The base path of this application
 536          * @param bool   $verbose
 537          * @param bool   $action     Whether to actually apply the update
 538          * @param bool   $install    Is this the initial update during the installation?
 539          * @param array  $tables     An array of the database tables
 540          * @param array  $definition An array of the definition tables
 541          * @return string Empty string if the update is successful, error messages otherwise
 542          * @throws Exception
 543          */
 544         private static function update($basePath, $verbose, $action, $install = false, array $tables = null, array $definition = null)
 545         {
 546                 $in_maintenance_mode = DI::config()->get('system', 'maintenance');
 547
 548                 if ($action && !$install && self::isUpdating()) {
 549                         return DI::l10n()->t('Another database update is currently running.');
 550                 }
 551
 552                 if ($in_maintenance_mode) {
 553                         DI::config()->set('system', 'maintenance_reason', DI::l10n()->t('%s: Database update', DateTimeFormat::utcNow() . ' ' . date('e')));
 554                 }
 555
 556                 // ensure that all initial values exist. This test has to be done prior and after the structure check.
 557                 // Prior is needed if the specific tables already exists - after is needed when they had been created.
 558                 self::checkInitialValues();
 559
 560                 $errors = '';
 561
 562                 Logger::info('updating structure');
 563
 564                 // Get the current structure
 565                 $database = [];
 566
 567                 if (is_null($tables)) {
 568                         $tables = DBA::toArray(DBA::p("SHOW TABLES"));
 569                 }
 570
 571                 if (DBA::isResult($tables)) {
 572                         foreach ($tables AS $table) {
 573                                 $table = current($table);
 574
 575                                 Logger::info('updating structure', ['table' => $table]);
 576                                 $database[$table] = self::tableStructure($table);
 577                         }
 578                 }
 579
 580                 // Get the definition
 581                 if (is_null($definition)) {
 582                         $definition = self::definition($basePath);
 583                 }
 584
 585                 // MySQL >= 5.7.4 doesn't support the IGNORE keyword in ALTER TABLE statements
 586                 if ((version_compare(DBA::serverInfo(), '5.7.4') >= 0) &&
 587                         !(strpos(DBA::serverInfo(), 'MariaDB') !== false)) {
 588                         $ignore = '';
 589                 } else {
 590                         $ignore = ' IGNORE';
 591                 }
 592
 593                 // Compare it
 594                 foreach ($definition AS $name => $structure) {
 595                         $is_new_table = false;
 596                         $group_by = "";
 597                         $sql3 = "";
 598                         $is_unique = false;
 599                         $temp_name = $name;
 600                         if (!isset($database[$name])) {
 601                                 $r = self::createTable($name, $structure, $verbose, $action);
 602                                 if (!DBA::isResult($r)) {
 603                                         $errors .= self::printUpdateError($name);
 604                                 }
 605                                 $is_new_table = true;
 606                         } else {
 607                                 foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 608                                         if (isset($database[$name]["indexes"][$indexname])) {
 609                                                 $current_index_definition = implode(",", $database[$name]["indexes"][$indexname]);
 610                                         } else {
 611                                                 $current_index_definition = "__NOT_SET__";
 612                                         }
 613                                         $new_index_definition = implode(",", $fieldnames);
 614                                         if ($current_index_definition != $new_index_definition) {
 615                                                 if ($fieldnames[0] == "UNIQUE") {
 616                                                         $is_unique = true;
 617                                                         if ($ignore == "") {
 618                                                                 $temp_name = "temp-" . $name;
 619                                                         }
 620                                                 }
 621                                         }
 622                                 }
 623
 624                                 /*
 625                                  * Drop the index if it isn't present in the definition
 626                                  * or the definition differ from current status
 627                                  * and index name doesn't start with "local_"
 628                                  */
 629                                 foreach ($database[$name]["indexes"] as $indexname => $fieldnames) {
 630                                         $current_index_definition = implode(",", $fieldnames);
 631                                         if (isset($structure["indexes"][$indexname])) {
 632                                                 $new_index_definition = implode(",", $structure["indexes"][$indexname]);
 633                                         } else {
 634                                                 $new_index_definition = "__NOT_SET__";
 635                                         }
 636                                         if ($current_index_definition != $new_index_definition && substr($indexname, 0, 6) != 'local_') {
 637                                                 $sql2 = self::dropIndex($indexname);
 638                                                 if ($sql3 == "") {
 639                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 640                                                 } else {
 641                                                         $sql3 .= ", " . $sql2;
 642                                                 }
 643                                         }
 644                                 }
 645                                 // Compare the field structure field by field
 646                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 647                                         if (!isset($database[$name]["fields"][$fieldname])) {
 648                                                 $sql2 = self::addTableField($fieldname, $parameters);
 649                                                 if ($sql3 == "") {
 650                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 651                                                 } else {
 652                                                         $sql3 .= ", " . $sql2;
 653                                                 }
 654                                         } else {
 655                                                 // Compare the field definition
 656                                                 $field_definition = $database[$name]["fields"][$fieldname];
 657
 658                                                 // Remove the relation data that is used for the referential integrity
 659                                                 unset($parameters['relation']);
 660                                                 unset($parameters['foreign']);
 661
 662                                                 // We change the collation after the indexes had been changed.
 663                                                 // This is done to avoid index length problems.
 664                                                 // So here we always ensure that there is no need to change it.
 665                                                 unset($parameters['Collation']);
 666                                                 unset($field_definition['Collation']);
 667
 668                                                 // Only update the comment when it is defined
 669                                                 if (!isset($parameters['comment'])) {
 670                                                         $parameters['comment'] = "";
 671                                                 }
 672
 673                                                 $current_field_definition = DBA::cleanQuery(implode(",", $field_definition));
 674                                                 $new_field_definition = DBA::cleanQuery(implode(",", $parameters));
 675                                                 if ($current_field_definition != $new_field_definition) {
 676                                                         $sql2 = self::modifyTableField($fieldname, $parameters);
 677                                                         if ($sql3 == "") {
 678                                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 679                                                         } else {
 680                                                                 $sql3 .= ", " . $sql2;
 681                                                         }
 682                                                 }
 683                                         }
 684                                 }
 685                         }
 686
 687                         /*
 688                          * Create the index if the index don't exists in database
 689                          * or the definition differ from the current status.
 690                          * Don't create keys if table is new
 691                          */
 692                         if (!$is_new_table) {
 693                                 foreach ($structure["indexes"] AS $indexname => $fieldnames) {
 694                                         if (isset($database[$name]["indexes"][$indexname])) {
 695                                                 $current_index_definition = implode(",", $database[$name]["indexes"][$indexname]);
 696                                         } else {
 697                                                 $current_index_definition = "__NOT_SET__";
 698                                         }
 699                                         $new_index_definition = implode(",", $fieldnames);
 700                                         if ($current_index_definition != $new_index_definition) {
 701                                                 $sql2 = self::createIndex($indexname, $fieldnames);
 702
 703                                                 // Fetch the "group by" fields for unique indexes
 704                                                 $group_by = self::groupBy($fieldnames);
 705                                                 if ($sql2 != "") {
 706                                                         if ($sql3 == "") {
 707                                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 708                                                         } else {
 709                                                                 $sql3 .= ", " . $sql2;
 710                                                         }
 711                                                 }
 712                                         }
 713                                 }
 714
 715                                 $existing_foreign_keys = $database[$name]['foreign_keys'];
 716
 717                                 // Foreign keys
 718                                 // Compare the field structure field by field
 719                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 720                                         if (empty($parameters['foreign'])) {
 721                                                 continue;
 722                                         }
 723
 724                                         $constraint = self::getConstraintName($name, $fieldname, $parameters);
 725
 726                                         unset($existing_foreign_keys[$constraint]);
 727
 728                                         if (empty($database[$name]['foreign_keys'][$constraint])) {
 729                                                 $sql2 = self::addForeignKey($name, $fieldname, $parameters);
 730
 731                                                 if ($sql3 == "") {
 732                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 733                                                 } else {
 734                                                         $sql3 .= ", " . $sql2;
 735                                                 }
 736                                         }
 737                                 }
 738
 739                                 foreach ($existing_foreign_keys as $param) {
 740                                         $sql2 = self::dropForeignKey($param['CONSTRAINT_NAME']);
 741
 742                                         if ($sql3 == "") {
 743                                                 $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 744                                         } else {
 745                                                 $sql3 .= ", " . $sql2;
 746                                         }
 747                                 }
 748
 749                                 if (isset($database[$name]["table_status"]["TABLE_COMMENT"])) {
 750                                         $structurecomment = $structure["comment"] ?? '';
 751                                         if ($database[$name]["table_status"]["TABLE_COMMENT"] != $structurecomment) {
 752                                                 $sql2 = "COMMENT = '" . DBA::escape($structurecomment) . "'";
 753
 754                                                 if ($sql3 == "") {
 755                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 756                                                 } else {
 757                                                         $sql3 .= ", " . $sql2;
 758                                                 }
 759                                         }
 760                                 }
 761
 762                                 if (isset($database[$name]["table_status"]["ENGINE"]) && isset($structure['engine'])) {
 763                                         if ($database[$name]["table_status"]["ENGINE"] != $structure['engine']) {
 764                                                 $sql2 = "ENGINE = '" . DBA::escape($structure['engine']) . "'";
 765
 766                                                 if ($sql3 == "") {
 767                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 768                                                 } else {
 769                                                         $sql3 .= ", " . $sql2;
 770                                                 }
 771                                         }
 772                                 }
 773
 774                                 if (isset($database[$name]["table_status"]["TABLE_COLLATION"])) {
 775                                         if ($database[$name]["table_status"]["TABLE_COLLATION"] != 'utf8mb4_general_ci') {
 776                                                 $sql2 = "DEFAULT COLLATE utf8mb4_general_ci";
 777
 778                                                 if ($sql3 == "") {
 779                                                         $sql3 = "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 780                                                 } else {
 781                                                         $sql3 .= ", " . $sql2;
 782                                                 }
 783                                         }
 784                                 }
 785
 786                                 if ($sql3 != "") {
 787                                         $sql3 .= "; ";
 788                                 }
 789
 790                                 // Now have a look at the field collations
 791                                 // Compare the field structure field by field
 792                                 foreach ($structure["fields"] AS $fieldname => $parameters) {
 793                                         // Compare the field definition
 794                                         $field_definition = ($database[$name]["fields"][$fieldname] ?? '') ?: ['Collation' => ''];
 795
 796                                         // Define the default collation if not given
 797                                         if (!isset($parameters['Collation']) && !empty($field_definition['Collation'])) {
 798                                                 $parameters['Collation'] = 'utf8mb4_general_ci';
 799                                         } else {
 800                                                 $parameters['Collation'] = null;
 801                                         }
 802
 803                                         if ($field_definition['Collation'] != $parameters['Collation']) {
 804                                                 $sql2 = self::modifyTableField($fieldname, $parameters);
 805                                                 if (($sql3 == "") || (substr($sql3, -2, 2) == "; ")) {
 806                                                         $sql3 .= "ALTER" . $ignore . " TABLE `" . $temp_name . "` " . $sql2;
 807                                                 } else {
 808                                                         $sql3 .= ", " . $sql2;
 809                                                 }
 810                                         }
 811                                 }
 812                         }
 813
 814                         if ($sql3 != "") {
 815                                 if (substr($sql3, -2, 2) != "; ") {
 816                                         $sql3 .= ";";
 817                                 }
 818
 819                                 $field_list = '';
 820                                 if ($is_unique && $ignore == '') {
 821                                         foreach ($database[$name]["fields"] AS $fieldname => $parameters) {
 822                                                 $field_list .= 'ANY_VALUE(`' . $fieldname . '`),';
 823                                         }
 824                                         $field_list = rtrim($field_list, ',');
 825                                 }
 826
 827                                 if ($verbose) {
 828                                         // Ensure index conversion to unique removes duplicates
 829                                         if ($is_unique && ($temp_name != $name)) {
 830                                                 if ($ignore != "") {
 831                                                         echo "SET session old_alter_table=1;\n";
 832                                                 } else {
 833                                                         echo "DROP TABLE IF EXISTS `" . $temp_name . "`;\n";
 834                                                         echo "CREATE TABLE `" . $temp_name . "` LIKE `" . $name . "`;\n";
 835                                                 }
 836                                         }
 837
 838                                         echo $sql3 . "\n";
 839
 840                                         if ($is_unique && ($temp_name != $name)) {
 841                                                 if ($ignore != "") {
 842                                                         echo "SET session old_alter_table=0;\n";
 843                                                 } else {
 844                                                         echo "INSERT INTO `" . $temp_name . "` SELECT " . DBA::anyValueFallback($field_list) . " FROM `" . $name . "`" . $group_by . ";\n";
 845                                                         echo "DROP TABLE `" . $name . "`;\n";
 846                                                         echo "RENAME TABLE `" . $temp_name . "` TO `" . $name . "`;\n";
 847                                                 }
 848                                         }
 849                                 }
 850
 851                                 if ($action) {
 852                                         if ($in_maintenance_mode) {
 853                                                 DI::config()->set('system', 'maintenance_reason', DI::l10n()->t('%s: updating %s table.', DateTimeFormat::utcNow() . ' ' . date('e'), $name));
 854                                         }
 855
 856                                         // Ensure index conversion to unique removes duplicates
 857                                         if ($is_unique && ($temp_name != $name)) {
 858                                                 if ($ignore != "") {
 859                                                         DBA::e("SET session old_alter_table=1;");
 860                                                 } else {
 861                                                         $r = DBA::e("DROP TABLE IF EXISTS `" . $temp_name . "`;");
 862                                                         if (!DBA::isResult($r)) {
 863                                                                 $errors .= self::printUpdateError($sql3);
 864                                                                 return $errors;
 865                                                         }
 866
 867                                                         $r = DBA::e("CREATE TABLE `" . $temp_name . "` LIKE `" . $name . "`;");
 868                                                         if (!DBA::isResult($r)) {
 869                                                                 $errors .= self::printUpdateError($sql3);
 870                                                                 return $errors;
 871                                                         }
 872                                                 }
 873                                         }
 874
 875                                         $r = DBA::e($sql3);
 876                                         if (!DBA::isResult($r)) {
 877                                                 $errors .= self::printUpdateError($sql3);
 878                                         }
 879                                         if ($is_unique && ($temp_name != $name)) {
 880                                                 if ($ignore != "") {
 881                                                         DBA::e("SET session old_alter_table=0;");
 882                                                 } else {
 883                                                         $r = DBA::e("INSERT INTO `" . $temp_name . "` SELECT " . $field_list . " FROM `" . $name . "`" . $group_by . ";");
 884                                                         if (!DBA::isResult($r)) {
 885                                                                 $errors .= self::printUpdateError($sql3);
 886                                                                 return $errors;
 887                                                         }
 888                                                         $r = DBA::e("DROP TABLE `" . $name . "`;");
 889                                                         if (!DBA::isResult($r)) {
 890                                                                 $errors .= self::printUpdateError($sql3);
 891                                                                 return $errors;
 892                                                         }
 893                                                         $r = DBA::e("RENAME TABLE `" . $temp_name . "` TO `" . $name . "`;");
 894                                                         if (!DBA::isResult($r)) {
 895                                                                 $errors .= self::printUpdateError($sql3);
 896                                                                 return $errors;
 897                                                         }
 898                                                 }
 899                                         }
 900                                 }
 901                         }
 902                 }
 903
 904                 View::create(false, $action);
 905
 906                 self::checkInitialValues();
 907
 908                 if ($action && !$install) {
 909                         if ($errors) {
 910                                 DI::config()->set('system', 'dbupdate', self::UPDATE_FAILED);
 911                         } else {
 912                                 DI::config()->set('system', 'dbupdate', self::UPDATE_SUCCESSFUL);
 913                         }
 914                 }
 915
 916                 return $errors;
 917         }
 918
 919         private static function tableStructure($table)
 920         {
 921                 // This query doesn't seem to be executable as a prepared statement
 922                 $indexes = DBA::toArray(DBA::p("SHOW INDEX FROM " . DBA::quoteIdentifier($table)));
 923
 924                 $fields = DBA::selectToArray(['INFORMATION_SCHEMA' => 'COLUMNS'],
 925                         ['COLUMN_NAME', 'COLUMN_TYPE', 'IS_NULLABLE', 'COLUMN_DEFAULT', 'EXTRA',
 926                         'COLUMN_KEY', 'COLLATION_NAME', 'COLUMN_COMMENT'],
 927                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ?",
 928                         DBA::databaseName(), $table]);
 929
 930                 $foreign_keys = DBA::selectToArray(['INFORMATION_SCHEMA' => 'KEY_COLUMN_USAGE'],
 931                         ['COLUMN_NAME', 'CONSTRAINT_NAME', 'REFERENCED_TABLE_NAME', 'REFERENCED_COLUMN_NAME'],
 932                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ? AND `REFERENCED_TABLE_SCHEMA` IS NOT NULL",
 933                         DBA::databaseName(), $table]);
 934
 935                 $table_status = DBA::selectFirst(['INFORMATION_SCHEMA' => 'TABLES'],
 936                         ['ENGINE', 'TABLE_COLLATION', 'TABLE_COMMENT'],
 937                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ?",
 938                         DBA::databaseName(), $table]);
 939
 940                 $fielddata = [];
 941                 $indexdata = [];
 942                 $foreigndata = [];
 943
 944                 if (DBA::isResult($foreign_keys)) {
 945                         foreach ($foreign_keys as $foreign_key) {
 946                                 $parameters = ['foreign' => [$foreign_key['REFERENCED_TABLE_NAME'] => $foreign_key['REFERENCED_COLUMN_NAME']]];
 947                                 $constraint = self::getConstraintName($table, $foreign_key['COLUMN_NAME'], $parameters);
 948                                 $foreigndata[$constraint] = $foreign_key;
 949                         }
 950                 }
 951
 952                 if (DBA::isResult($indexes)) {
 953                         foreach ($indexes AS $index) {
 954                                 if ($index["Key_name"] != "PRIMARY" && $index["Non_unique"] == "0" && !isset($indexdata[$index["Key_name"]])) {
 955                                         $indexdata[$index["Key_name"]] = ["UNIQUE"];
 956                                 }
 957
 958                                 if ($index["Index_type"] == "FULLTEXT" && !isset($indexdata[$index["Key_name"]])) {
 959                                         $indexdata[$index["Key_name"]] = ["FULLTEXT"];
 960                                 }
 961
 962                                 $column = $index["Column_name"];
 963
 964                                 if ($index["Sub_part"] != "") {
 965                                         $column .= "(" . $index["Sub_part"] . ")";
 966                                 }
 967
 968                                 $indexdata[$index["Key_name"]][] = $column;
 969                         }
 970                 }
 971
 972                 $fielddata = [];
 973                 if (DBA::isResult($fields)) {
 974                         foreach ($fields AS $field) {
 975                                 $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)'];
 976                                 $replace = ['boolean', 'tinyint unsigned', 'tinyint', 'smallint unsigned', 'smallint', 'mediumint unsigned', 'mediumint', 'bigint', 'int unsigned', 'int'];
 977                                 $field['COLUMN_TYPE'] = str_replace($search, $replace, $field['COLUMN_TYPE']);
 978
 979                                 $fielddata[$field['COLUMN_NAME']]['type'] = $field['COLUMN_TYPE'];
 980
 981                                 if ($field['IS_NULLABLE'] == 'NO') {
 982                                         $fielddata[$field['COLUMN_NAME']]['not null'] = true;
 983                                 }
 984
 985                                 if (isset($field['COLUMN_DEFAULT']) && ($field['COLUMN_DEFAULT'] != 'NULL')) {
 986                                         $fielddata[$field['COLUMN_NAME']]['default'] = trim($field['COLUMN_DEFAULT'], "'");
 987                                 }
 988
 989                                 if (!empty($field['EXTRA'])) {
 990                                         $fielddata[$field['COLUMN_NAME']]['extra'] = $field['EXTRA'];
 991                                 }
 992
 993                                 if ($field['COLUMN_KEY'] == 'PRI') {
 994                                         $fielddata[$field['COLUMN_NAME']]['primary'] = true;
 995                                 }
 996
 997                                 $fielddata[$field['COLUMN_NAME']]['Collation'] = $field['COLLATION_NAME'];
 998                                 $fielddata[$field['COLUMN_NAME']]['comment'] = $field['COLUMN_COMMENT'];
 999                         }
1000                 }
1001
1002                 return ["fields" => $fielddata, "indexes" => $indexdata,
1003                         "foreign_keys" => $foreigndata, "table_status" => $table_status];
1004         }
1005
1006         private static function dropIndex($indexname)
1007         {
1008                 $sql = sprintf("DROP INDEX `%s`", DBA::escape($indexname));
1009                 return ($sql);
1010         }
1011
1012         private static function addTableField($fieldname, $parameters)
1013         {
1014                 $sql = sprintf("ADD `%s` %s", DBA::escape($fieldname), self::FieldCommand($parameters));
1015                 return ($sql);
1016         }
1017
1018         private static function modifyTableField($fieldname, $parameters)
1019         {
1020                 $sql = sprintf("MODIFY `%s` %s", DBA::escape($fieldname), self::FieldCommand($parameters, false));
1021                 return ($sql);
1022         }
1023
1024         private static function getConstraintName(string $tablename, string $fieldname, array $parameters)
1025         {
1026                 $foreign_table = array_keys($parameters['foreign'])[0];
1027                 $foreign_field = array_values($parameters['foreign'])[0];
1028
1029                 return $tablename . "-" . $fieldname. "-" . $foreign_table. "-" . $foreign_field;
1030         }
1031
1032         private static function foreignCommand(string $tablename, string $fieldname, array $parameters) {
1033                 $foreign_table = array_keys($parameters['foreign'])[0];
1034                 $foreign_field = array_values($parameters['foreign'])[0];
1035
1036                 $sql = "FOREIGN KEY (`" . $fieldname . "`) REFERENCES `" . $foreign_table . "` (`" . $foreign_field . "`)";
1037
1038                 if (!empty($parameters['foreign']['on update'])) {
1039                         $sql .= " ON UPDATE " . strtoupper($parameters['foreign']['on update']);
1040                 } else {
1041                         $sql .= " ON UPDATE RESTRICT";
1042                 }
1043
1044                 if (!empty($parameters['foreign']['on delete'])) {
1045                         $sql .= " ON DELETE " . strtoupper($parameters['foreign']['on delete']);
1046                 } else {
1047                         $sql .= " ON DELETE CASCADE";
1048                 }
1049
1050                 return $sql;
1051         }
1052
1053         private static function addForeignKey(string $tablename, string $fieldname, array $parameters)
1054         {
1055                 return sprintf("ADD %s", self::foreignCommand($tablename, $fieldname, $parameters));
1056         }
1057
1058         private static function dropForeignKey(string $constraint)
1059         {
1060                 return sprintf("DROP FOREIGN KEY `%s`", $constraint);
1061         }
1062
1063         /**
1064          * Constructs a GROUP BY clause from a UNIQUE index definition.
1065          *
1066          * @param array $fieldnames
1067          * @return string
1068          */
1069         private static function groupBy(array $fieldnames)
1070         {
1071                 if ($fieldnames[0] != "UNIQUE") {
1072                         return "";
1073                 }
1074
1075                 array_shift($fieldnames);
1076
1077                 $names = "";
1078                 foreach ($fieldnames AS $fieldname) {
1079                         if ($names != "") {
1080                                 $names .= ",";
1081                         }
1082
1083                         if (preg_match('|(.+)\((\d+)\)|', $fieldname, $matches)) {
1084                                 $names .= "`" . DBA::escape($matches[1]) . "`";
1085                         } else {
1086                                 $names .= "`" . DBA::escape($fieldname) . "`";
1087                         }
1088                 }
1089
1090                 $sql = sprintf(" GROUP BY %s", $names);
1091                 return $sql;
1092         }
1093
1094         /**
1095          * Renames columns or the primary key of a table
1096          *
1097          * @todo You cannot rename a primary key if "auto increment" is set
1098          *
1099          * @param string $table            Table name
1100          * @param array  $columns          Columns Syntax for Rename: [ $old1 => [ $new1, $type1 ], $old2 => [ $new2, $type2 ], ... ]
1101          *                                 Syntax for Primary Key: [ $col1, $col2, ...]
1102          * @param int    $type             The type of renaming (Default is Column)
1103          *
1104          * @return boolean Was the renaming successful?
1105          * @throws Exception
1106          */
1107         public static function rename($table, $columns, $type = self::RENAME_COLUMN)
1108         {
1109                 if (empty($table) || empty($columns)) {
1110                         return false;
1111                 }
1112
1113                 if (!is_array($columns)) {
1114                         return false;
1115                 }
1116
1117                 $table = DBA::escape($table);
1118
1119                 $sql = "ALTER TABLE `" . $table . "`";
1120                 switch ($type) {
1121                         case self::RENAME_COLUMN:
1122                                 if (!self::existsColumn($table, array_keys($columns))) {
1123                                         return false;
1124                                 }
1125                                 $sql .= implode(',', array_map(
1126                                         function ($to, $from) {
1127                                                 return " CHANGE `" . $from . "` `" . $to[0] . "` " . $to[1];
1128                                         },
1129                                         $columns,
1130                                         array_keys($columns)
1131                                 ));
1132                                 break;
1133                         case self::RENAME_PRIMARY_KEY:
1134                                 if (!self::existsColumn($table, $columns)) {
1135                                         return false;
1136                                 }
1137                                 $sql .= " DROP PRIMARY KEY, ADD PRIMARY KEY(`" . implode('`, `', $columns) . "`)";
1138                                 break;
1139                         default:
1140                                 return false;
1141                 }
1142
1143                 $sql .= ";";
1144
1145                 $stmt = DBA::p($sql);
1146
1147                 if (is_bool($stmt)) {
1148                         $retval = $stmt;
1149                 } else {
1150                         $retval = true;
1151                 }
1152
1153                 DBA::close($stmt);
1154
1155                 return $retval;
1156         }
1157
1158         /**
1159          *    Check if the columns of the table exists
1160          *
1161          * @param string $table   Table name
1162          * @param array  $columns Columns to check ( Syntax: [ $col1, $col2, .. ] )
1163          *
1164          * @return boolean Does the table exist?
1165          * @throws Exception
1166          */
1167         public static function existsColumn($table, $columns = [])
1168         {
1169                 if (empty($table)) {
1170                         return false;
1171                 }
1172
1173                 if (is_null($columns) || empty($columns)) {
1174                         return self::existsTable($table);
1175                 }
1176
1177                 $table = DBA::escape($table);
1178
1179                 foreach ($columns AS $column) {
1180                         $sql = "SHOW COLUMNS FROM `" . $table . "` LIKE '" . $column . "';";
1181
1182                         $stmt = DBA::p($sql);
1183
1184                         if (is_bool($stmt)) {
1185                                 $retval = $stmt;
1186                         } else {
1187                                 $retval = (DBA::numRows($stmt) > 0);
1188                         }
1189
1190                         DBA::close($stmt);
1191
1192                         if (!$retval) {
1193                                 return false;
1194                         }
1195                 }
1196
1197                 return true;
1198         }
1199
1200         /**
1201          * Check if a foreign key exists for the given table field
1202          *
1203          * @param string $table
1204          * @param string $field
1205          * @return boolean
1206          */
1207         public static function existsForeignKeyForField(string $table, string $field)
1208         {
1209                 return DBA::exists(['INFORMATION_SCHEMA' => 'KEY_COLUMN_USAGE'],
1210                         ["`TABLE_SCHEMA` = ? AND `TABLE_NAME` = ? AND `COLUMN_NAME` = ? AND `REFERENCED_TABLE_SCHEMA` IS NOT NULL",
1211                         DBA::databaseName(), $table, $field]);
1212         }
1213         /**
1214          *    Check if a table exists
1215          *
1216          * @param string|array $table Table name
1217          *
1218          * @return boolean Does the table exist?
1219          * @throws Exception
1220          */
1221         public static function existsTable($table)
1222         {
1223                 if (empty($table)) {
1224                         return false;
1225                 }
1226
1227                 if (is_array($table)) {
1228                         $condition = ['table_schema' => key($table), 'table_name' => current($table)];
1229                 } else {
1230                         $condition = ['table_schema' => DBA::databaseName(), 'table_name' => $table];
1231                 }
1232
1233                 $result = DBA::exists(['information_schema' => 'tables'], $condition);
1234
1235                 return $result;
1236         }
1237
1238         /**
1239          * Returns the columns of a table
1240          *
1241          * @param string $table Table name
1242          *
1243          * @return array An array of the table columns
1244          * @throws Exception
1245          */
1246         public static function getColumns($table)
1247         {
1248                 $stmtColumns = DBA::p("SHOW COLUMNS FROM `" . $table . "`");
1249                 return DBA::toArray($stmtColumns);
1250         }
1251
1252         /**
1253          * Check if initial database values do exist - or create them
1254          */
1255         public static function checkInitialValues(bool $verbose = false)
1256         {
1257                 if (self::existsTable('verb')) {
1258                         if (!DBA::exists('verb', ['id' => 1])) {
1259                                 foreach (Item::ACTIVITIES as $index => $activity) {
1260                                         DBA::insert('verb', ['id' => $index + 1, 'name' => $activity], Database::INSERT_IGNORE);
1261                                 }
1262                                 if ($verbose) {
1263                                         echo "verb: activities added\n";
1264                                 }
1265                         } elseif ($verbose) {
1266                                 echo "verb: activities already added\n";
1267                         }
1268
1269                         if (!DBA::exists('verb', ['id' => 0])) {
1270                                 DBA::insert('verb', ['name' => '']);
1271                                 $lastid = DBA::lastInsertId();
1272                                 if ($lastid != 0) {
1273                                         DBA::update('verb', ['id' => 0], ['id' => $lastid]);
1274                                         if ($verbose) {
1275                                                 echo "Zero verb added\n";
1276                                         }
1277                                 }
1278                         } elseif ($verbose) {
1279                                 echo "Zero verb already added\n";
1280                         }
1281                 } elseif ($verbose) {
1282                         echo "verb: Table not found\n";
1283                 }
1284
1285                 if (self::existsTable('user') && !DBA::exists('user', ['uid' => 0])) {
1286                         $user = [
1287                                 "verified" => true,
1288                                 "page-flags" => User::PAGE_FLAGS_SOAPBOX,
1289                                 "account-type" => User::ACCOUNT_TYPE_RELAY,
1290                         ];
1291                         DBA::insert('user', $user);
1292                         $lastid = DBA::lastInsertId();
1293                         if ($lastid != 0) {
1294                                 DBA::update('user', ['uid' => 0], ['uid' => $lastid]);
1295                                 if ($verbose) {
1296                                         echo "Zero user added\n";
1297                                 }
1298                         }
1299                 } elseif (self::existsTable('user') && $verbose) {
1300                         echo "Zero user already added\n";
1301                 } elseif ($verbose) {
1302                         echo "user: Table not found\n";
1303                 }
1304
1305                 if (self::existsTable('contact') && !DBA::exists('contact', ['id' => 0])) {
1306                         DBA::insert('contact', ['nurl' => '']);
1307                         $lastid = DBA::lastInsertId();
1308                         if ($lastid != 0) {
1309                                 DBA::update('contact', ['id' => 0], ['id' => $lastid]);
1310                                 if ($verbose) {
1311                                         echo "Zero contact added\n";
1312                                 }
1313                         }
1314                 } elseif (self::existsTable('contact') && $verbose) {
1315                         echo "Zero contact already added\n";
1316                 } elseif ($verbose) {
1317                         echo "contact: Table not found\n";
1318                 }
1319
1320                 if (self::existsTable('tag') && !DBA::exists('tag', ['id' => 0])) {
1321                         DBA::insert('tag', ['name' => '']);
1322                         $lastid = DBA::lastInsertId();
1323                         if ($lastid != 0) {
1324                                 DBA::update('tag', ['id' => 0], ['id' => $lastid]);
1325                                 if ($verbose) {
1326                                         echo "Zero tag added\n";
1327                                 }
1328                         }
1329                 } elseif (self::existsTable('tag') && $verbose) {
1330                         echo "Zero tag already added\n";
1331                 } elseif ($verbose) {
1332                         echo "tag: Table not found\n";
1333                 }
1334
1335                 if (self::existsTable('permissionset')) {
1336                         if (!DBA::exists('permissionset', ['id' => 0])) {
1337                                 DBA::insert('permissionset', ['allow_cid' => '', 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => '']);
1338                                 $lastid = DBA::lastInsertId();
1339                                 if ($lastid != 0) {
1340                                         DBA::update('permissionset', ['id' => 0], ['id' => $lastid]);
1341                                         if ($verbose) {
1342                                                 echo "Zero permissionset added\n";
1343                                         }
1344                                 }
1345                         } elseif ($verbose) {
1346                                 echo "Zero permissionset already added\n";
1347                         }
1348                         if (self::existsTable('item') && !self::existsForeignKeyForField('item', 'psid')) {
1349                                 $sets = DBA::p("SELECT `psid`, `item`.`uid`, `item`.`private` FROM `item`
1350                                         LEFT JOIN `permissionset` ON `permissionset`.`id` = `item`.`psid`
1351                                         WHERE `permissionset`.`id` IS NULL AND NOT `psid` IS NULL");
1352                                 while ($set = DBA::fetch($sets)) {
1353                                         if (($set['private'] == Item::PRIVATE) && ($set['uid'] != 0)) {
1354                                                 $owner = User::getOwnerDataById($set['uid']);
1355                                                 if ($owner) {
1356                                                         $permission = '<' . $owner['id'] . '>';
1357                                                 } else {
1358                                                         $permission = '<>';
1359                                                 }
1360                                         } else {
1361                                                 $permission = '';
1362                                         }
1363                                         $fields = ['id' => $set['psid'], 'uid' => $set['uid'], 'allow_cid' => $permission,
1364                                                 'allow_gid' => '', 'deny_cid' => '', 'deny_gid' => ''];
1365                                         DBA::insert('permissionset', $fields);
1366                                 }
1367                                 DBA::close($sets);
1368                         }
1369                 } elseif ($verbose) {
1370                         echo "permissionset: Table not found\n";
1371                 }
1372
1373                 if (self::existsTable('tokens') && self::existsTable('clients') && !self::existsForeignKeyForField('tokens', 'client_id')) {
1374                         $tokens = DBA::p("SELECT `tokens`.`id` FROM `tokens`
1375                                 LEFT JOIN `clients` ON `clients`.`client_id` = `tokens`.`client_id`
1376                                 WHERE `clients`.`client_id` IS NULL");
1377                         while ($token = DBA::fetch($tokens)) {
1378                                 DBA::delete('tokens', ['id' => $token['id']]);
1379                         }
1380                         DBA::close($tokens);
1381                 }
1382         }
1383
1384         /**
1385          * Checks if a database update is currently running
1386          *
1387          * @return boolean
1388          */
1389         private static function isUpdating()
1390         {
1391                 $isUpdate = false;
1392
1393                 $processes = DBA::select(['information_schema' => 'processlist'], ['info'],
1394                         ['db' => DBA::databaseName(), 'command' => ['Query', 'Execute']]);
1395
1396                 while ($process = DBA::fetch($processes)) {
1397                         $parts = explode(' ', $process['info']);
1398                         if (in_array(strtolower(array_shift($parts)), ['alter', 'create', 'drop', 'rename'])) {
1399                                 $isUpdate = true;
1400                         }
1401                 }
1402
1403                 DBA::close($processes);
1404
1405                 return $isUpdate;
1406         }
1407 }