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<?php
/**
 * This program is part of Mahara
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301 USA
 *
 * @package    mahara
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 * @subpackage core
 * @author     Penny Leach <penny@catalyst.net.nz>
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 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL
 * @copyright  (C) 2006,2007 Catalyst IT Ltd http://catalyst.net.nz
 *
 */

defined('INTERNAL') || die();

function xmldb_core_upgrade($oldversion=0) {

    $status = true;

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    // we're saved by minupgradefrom, so upgrades previous to the most recent minupgradefrom can be always deleted.
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    if ($oldversion < 2007081700) {
        // Remove groups from the system
        $table = new XMLDBTable('view_access_group');
        drop_table($table);

        $table = new XMLDBTable('usr_group_member');
        drop_table($table);

        $table = new XMLDBTable('usr_group');
        drop_table($table);
    }

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    if ($oldversion < 2007081701) {
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        // Rename the community tables to group
        if (is_postgres()) {
            // Done manually for postgres to ensure all of the indexes and constraints are renamed
            execute_sql("
            ALTER TABLE {community} RENAME TO {group};
            ALTER TABLE {community_id_seq} RENAME TO {group_id_seq};
            ALTER INDEX {comm_id_pk} RENAME TO {grou_id_pk};
            ALTER INDEX {comm_nam_uix} RENAME TO {grou_nam_uix};
            ALTER INDEX {comm_own_ix} RENAME TO {grou_own_ix};
            ALTER TABLE {group} DROP CONSTRAINT {comm_joi_ck};
            ALTER TABLE {group} ADD CONSTRAINT {grou_joi_ck} CHECK (jointype::text = 'controlled'::text OR jointype::text = 'invite'::text OR jointype::text = 'request'::text OR jointype::text = 'open'::text);
            ALTER TABLE {group} DROP CONSTRAINT {comm_own_fk};
            ALTER TABLE {group} ADD CONSTRAINT {grou_own_fk} FOREIGN KEY (\"owner\") REFERENCES {usr}(id);
            ");
             
            execute_sql("
            ALTER TABLE {community_member} RENAME TO {group_member};
            ALTER TABLE {group_member} RENAME community TO \"group\";
            ALTER INDEX {commmemb_commem_pk} RENAME TO {groumemb_gromem_pk};
            ALTER INDEX {commmemb_com_ix} RENAME TO {groumemb_gro_ix};
            ALTER INDEX {commmemb_mem_ix} RENAME TO {groumemb_mem_ix};
            ALTER TABLE {group_member} DROP CONSTRAINT {commmemb_com_fk};
            ALTER TABLE {group_member} ADD CONSTRAINT {groumemb_gro_fk}  FOREIGN KEY (\"group\") REFERENCES {group}(id);
            ALTER TABLE {group_member} DROP CONSTRAINT {commmemb_mem_fk};
            ALTER TABLE {group_member} ADD CONSTRAINT {groumemb_mem_fk} FOREIGN KEY (\"member\") REFERENCES {usr}(id);
            ");

            execute_sql("
            ALTER TABLE {community_member_request} RENAME TO {group_member_request};
            ALTER TABLE {group_member_request} RENAME community TO \"group\";
            ALTER INDEX {commmembrequ_commem_pk} RENAME TO {groumembrequ_gromem_pk};
            ALTER INDEX {commmembrequ_com_ix} RENAME TO {groumembrequ_gro_ix};
            ALTER INDEX {commmembrequ_mem_ix} RENAME TO {groumembrequ_mem_ix};
            ALTER TABLE {group_member_request} DROP CONSTRAINT {commmembrequ_com_fk};
            ALTER TABLE {group_member_request} ADD CONSTRAINT {groumembrequ_gro_fk} FOREIGN KEY (\"group\") REFERENCES {group}(id);
            ALTER TABLE {group_member_request} DROP CONSTRAINT {commmembrequ_mem_fk};
            ALTER TABLE {group_member_request} ADD CONSTRAINT {groumembrequ_mem_fk} FOREIGN KEY (member) REFERENCES {usr}(id);
            ");

            execute_sql("
            ALTER TABLE {community_member_invite} RENAME TO {group_member_invite};
            ALTER TABLE {group_member_invite} RENAME community TO \"group\";
            ALTER INDEX {commmembinvi_commem_pk} RENAME TO {groumembinvi_gromem_pk};
            ALTER INDEX {commmembinvi_com_ix} RENAME TO {groumembinvi_gro_ix};
            ALTER INDEX {commmembinvi_mem_ix} RENAME TO {groumembinvi_mem_ix};
            ALTER TABLE {group_member_invite} DROP CONSTRAINT {commmembinvi_com_fk};
            ALTER TABLE {group_member_invite} ADD CONSTRAINT {groumembinvi_gro_fk} FOREIGN KEY (\"group\") REFERENCES {group}(id);
            ALTER TABLE {group_member_invite} DROP CONSTRAINT {commmembinvi_mem_fk};
            ALTER TABLE {group_member_invite} ADD CONSTRAINT {groumembinvi_mem_fk} FOREIGN KEY (member) REFERENCES {usr}(id);
            ");

            execute_sql("
            ALTER TABLE {usr_watchlist_community} RENAME TO {usr_watchlist_group};
            ALTER TABLE {usr_watchlist_group} RENAME community TO \"group\";
            ALTER INDEX {usrwatccomm_usrcom_pk} RENAME TO {usrwatcgrou_usrgro_pk};
            ALTER INDEX {usrwatccomm_com_ix} RENAME TO {usrwatcgrou_gro_ix};
            ALTER INDEX {usrwatccomm_usr_ix} RENAME TO {usrwatcgrou_usr_ix};
            ALTER TABLE {usr_watchlist_group} DROP CONSTRAINT {usrwatccomm_com_fk};
            ALTER TABLE {usr_watchlist_group} ADD CONSTRAINT {usrwatcgrou_com_fk} FOREIGN KEY (\"group\") REFERENCES {group}(id);
            ALTER TABLE {usr_watchlist_group} DROP CONSTRAINT {usrwatccomm_usr_fk};
            ALTER TABLE {usr_watchlist_group} ADD CONSTRAINT {usrwatcgrou_usr_fk} FOREIGN KEY (usr) REFERENCES {usr}(id);
            ");

            execute_sql("
            ALTER TABLE {view_access_community} RENAME TO {view_access_group};
            ALTER TABLE {view_access_group} RENAME community TO \"group\";
            ALTER INDEX {viewaccecomm_com_ix} RENAME TO {viewaccegrou_gro_ix};
            ALTER INDEX {viewaccecomm_vie_ix} RENAME TO {viewaccegrou_vie_ix};
            ALTER TABLE {view_access_group} DROP CONSTRAINT {viewaccecomm_com_fk};
            ALTER TABLE {view_access_group} ADD CONSTRAINT {viewaccegrou_gro_fk} FOREIGN KEY (\"group\") REFERENCES {group}(id);
            ALTER TABLE {view_access_group} DROP CONSTRAINT {viewaccecomm_vie_fk};
            ALTER TABLE {view_access_group} ADD CONSTRAINT {viewaccegrou_vie_fk} FOREIGN KEY (\"view\") REFERENCES {view}(id);
            ");
        }
    }

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    if ($oldversion < 2007082100) {
        // Fix two mistakes in the 0.8 upgrade:
        //
        // 1) Only the internal institituion had an internal auth instance added for it. This should have meant that all users not in the internal institution were locked out, but...
        // 2) All users were assigned to be in the internal auth instance, regardless of what institution they were in

        $users = get_records_array('usr', '', '', '', 'id, username, institution, authinstance');
        if ($users) {
            $authinstances = get_records_assoc('auth_instance', '', '', '', 'institution, id');
            foreach (array_keys($authinstances) as $key) {
                $authinstances[$key] = $authinstances[$key]->id;
            }
            foreach ($users as $user) {
                if (!isset($authinstances[$user->institution])) {
                    // There does not seem to be an authinstance set up for 
                    // this user's institution. We should fix that now.
                    $authinstance = (object)array(
                        'instancename' => 'internal',
                        'priority'     => 1,
                        'institution' => $user->institution,
                        'authname'     => 'internal'
                    );
                    
                    $authinstances[$user->institution] = insert_record('auth_instance', $authinstance, 'id', true);
                }
                if ($user->authinstance != $authinstances[$user->institution]) {
                    // Fix the user's authinstance
                    $user->authinstance = $authinstances[$user->institution];
                    update_record('usr', $user, 'id');
                }
            }
        }
    }

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    if ($oldversion < 2007082200) {
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        // Remove watchlist functionality apart from watching views
        $table = new XMLDBTable('usr_watchlist_group');
        drop_table($table);

        $table = new XMLDBTable('usr_watchlist_artefact');
        drop_table($table);

        $table = new XMLDBTable('usr_watchlist_view');
        $field = new XMLDBField('recurse');
        $field->setAttributes(XMLDB_TYPE_INTEGER, 1, false, true, false, null, null, 1);
        drop_field($table, $field);
    }

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    if ($oldversion < 2007082201) {
        // Rename the community tables to group - mysql version.
        // This is really quite hacky. You can't rename columns with a foreign 
        // key on them, so you have to drop the key, rename the column, re-add 
        // the key and hope that nobody inserted anything inconsistent in the 
        // time you were renaming the column
        if (is_mysql()) {
            execute_sql("ALTER TABLE {community} RENAME TO {group}");

            execute_sql("ALTER TABLE {community_member} RENAME TO {group_member}");
            execute_sql("ALTER TABLE {group_member} DROP FOREIGN KEY commmemb_com_fk");
            execute_sql("ALTER TABLE {group_member} CHANGE community \"group\" BIGINT(10) DEFAULT NULL");
            execute_sql("ALTER TABLE {group_member} ADD FOREIGN KEY(\"group\") REFERENCES \"group\"(id)");

            execute_sql("ALTER TABLE {community_member_request} RENAME TO {group_member_request}");
            execute_sql("ALTER TABLE {group_member_request} DROP FOREIGN KEY commmembrequ_com_fk");
            execute_sql("ALTER TABLE {group_member_request} CHANGE community \"group\" BIGINT(10) DEFAULT NULL");
            execute_sql("ALTER TABLE {group_member_request} ADD FOREIGN KEY(\"group\") REFERENCES \"group\"(id)");

            execute_sql("ALTER TABLE {community_member_invite} RENAME TO {group_member_invite}");
            execute_sql("ALTER TABLE {group_member_invite} DROP FOREIGN KEY commmembinvi_com_fk");
            execute_sql("ALTER TABLE {group_member_invite} CHANGE community \"group\" BIGINT(10) DEFAULT NULL");
            execute_sql("ALTER TABLE {group_member_invite} ADD FOREIGN KEY(\"group\") REFERENCES \"group\"(id)");

            execute_sql("DROP TABLE {usr_watchlist_community}");

            execute_sql("ALTER TABLE {view_access_community} RENAME TO {view_access_group}");
            execute_sql("ALTER TABLE {view_access_group} DROP FOREIGN KEY viewaccecomm_com_fk");
            execute_sql("ALTER TABLE {view_access_group} CHANGE community \"group\" BIGINT(10) DEFAULT NULL");
            execute_sql("ALTER TABLE {view_access_group} ADD FOREIGN KEY(\"group\") REFERENCES \"group\"(id)");
        }
    }

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    // VIEW REWORK MIGRATION
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    if ($oldversion < 2007100200) {
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        $table = new XMLDBTable('view_layout');
        $table->addFieldInfo('id', XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED,
            XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
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        $table->addFieldInfo('columns', XMLDB_TYPE_INTEGER, 1, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('widths',  XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
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        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
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        $table->addKeyInfo('columnwidthuk', XMLDB_KEY_UNIQUE, array('columns', 'widths'));
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        create_table($table);

        $table = new XMLDBTable('view');
        $field = new XMLDBField('numcolumns');
        $field->setAttributes(XMLDB_TYPE_INTEGER, 2, XMLDB_UNSIGNED, null);
        add_field($table, $field);
        set_field('view', 'numcolumns', 3);
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        $field->setAttributes(XMLDB_TYPE_INTEGER, 2, XMLDB_UNSIGNED, XMLDB_NOTNULL);
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        change_field_notnull($table, $field);

        $field = new XMLDBField('layout');
        $field->setAttributes(XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED, null);
        add_field($table, $field);
        $key = new XMLDBKEY('layoutfk');
        $key->setAttributes(XMLDB_KEY_FOREIGN, array('layout'), 'view_layout', array('id'));
        add_key($table, $key);

    
        // plugin contract tables for new blocktype plugin type.
        $table = new XMLDBTable('blocktype_category');
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        $table->addFieldInfo('name', XMLDB_TYPE_CHAR, 50, XMLDB_UNSIGNED, XMLDB_NOTNULL);
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        $table->addkeyInfo('primary', XMLDB_KEY_PRIMARY, array('name'));

        create_table($table);

        $table = new XMLDBTable('blocktype_installed');
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        $table->addFieldInfo('name', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('version', XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED, XMLDB_NOTNULL);
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        $table->addFieldInfo('release', XMLDB_TYPE_TEXT, 'small', XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('active', XMLDB_TYPE_INTEGER,  1, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, 1);
        $table->addFieldInfo('artefactplugin', XMLDB_TYPE_CHAR, 255);
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        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('name'));
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        $table->addKeyInfo('artefactpluginfk', XMLDB_KEY_FOREIGN, array('artefactplugin'), 'artefact_installed', array('name'));
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        create_table($table);
       
        $table = new XMLDBTable('blocktype_cron');
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        $table->addFieldInfo('plugin', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('callfunction', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('minute', XMLDB_TYPE_CHAR, 25, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, '*');
        $table->addFieldInfo('hour', XMLDB_TYPE_CHAR, 25, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, '*');
        $table->addFieldInfo('day', XMLDB_TYPE_CHAR, 25, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, '*');
        $table->addFieldInfo('dayofweek', XMLDB_TYPE_CHAR, 25, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, '*');
        $table->addFieldInfo('month', XMLDB_TYPE_CHAR, 25, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, '*');
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        $table->addFieldInfo('nextrun', XMLDB_TYPE_DATETIME, null, null);
        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('plugin', 'callfunction'));
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        $table->addKeyInfo('pluginfk', XMLDB_KEY_FOREIGN, array('plugin'), 'blocktype_installed', array('name'));
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        create_table($table); 

        $table = new XMLDBTable('blocktype_config');
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        $table->addFieldInfo('plugin', XMLDB_TYPE_CHAR, 100, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('field', XMLDB_TYPE_CHAR, 100, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('value', XMLDB_TYPE_TEXT, 'small', XMLDB_UNSIGNED, XMLDB_NOTNULL);
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        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('plugin', 'field'));
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        $table->addKeyInfo('pluginfk', XMLDB_KEY_FOREIGN, array('plugin'), 'blocktype_installed', array('name'));
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        create_table($table);

        $table = new XMLDBTable('blocktype_event_subscription');
        $table->addFieldInfo('id', XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED, 
            XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
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        $table->addFieldInfo('plugin', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('event', XMLDB_TYPE_CHAR, 50, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('callfunction', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
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        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addKeyInfo('pluginfk', XMLDB_KEY_FOREIGN, array('plugin'), 'blocktype_installed', array('name'));
        $table->addKeyInfo('eventfk', XMLDB_KEY_FOREIGN, array('event'), 'event_type', array('name'));
        $table->addKeyInfo('subscruk', XMLDB_KEY_UNIQUE, array('plugin', 'event', 'callfunction'));

        create_table($table);

        $table = new XMLDBTable('blocktype_installed_category');
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        $table->addFieldInfo('blocktype', XMLDB_TYPE_CHAR, 50, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('category', XMLDB_TYPE_CHAR, 50, XMLDB_UNSIGNED, XMLDB_NOTNULL);
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        $table->addKeyInfo('blocktypefk', XMLDB_KEY_FOREIGN, array('blocktype'), 'blocktype_installed', array('name'));
        $table->addKeyInfo('categoryfk', XMLDB_KEY_FOREIGN, array('category'), 'blocktype_category', array('name'));

        create_table($table);
        
        $table = new XMLDBTable('block_instance');
        $table->addFieldInfo('id', XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED,
            XMLDB_NOTNULL, XMLDB_SEQUENCE, null, null, null);
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        $table->addFieldInfo('blocktype', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('title', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
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        $table->addFieldInfo('configdata', XMLDB_TYPE_TEXT, null);
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        $table->addFieldInfo('view', XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFIeldInfo('column', XMLDB_TYPE_INTEGER, 2, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFIeldInfo('order', XMLDB_TYPE_INTEGER, 2, XMLDB_UNSIGNED,  XMLDB_NOTNULL);
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        $table->addKeyInfo('primary', XMLDB_KEY_PRIMARY, array('id'));
        $table->addKeyInfo('blocktypefk', XMLDB_KEY_FOREIGN, array('blocktype'), 'blocktype_installed', array('name'));
        $table->addKeyInfo('viewfk', XMLDB_KEY_FOREIGN, array('view'), 'view', array('id'));
        $table->addKeyInfo('viewcolumnorderuk', XMLDB_KEY_UNIQUE, array('view', 'column', 'order'));

        create_table($table);
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        // move old block field in view_artefact out of the way
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        table_column('view_artefact', 'block', 'oldblock', 'text');
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        $table = new XMLDBTable('view_artefact');
        $field = new XMLDBField('block');
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        $field->setAttributes(XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED, null);
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        add_field($table, $field);
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        $key = new XMLDBKey('blockfk');
        $key->setAttributes(XMLDB_KEY_FOREIGN, array('block'), 'block_instance', array('id'));
        add_key($table, $key);
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        require_once(get_config('docroot') . 'lib/db/templatemigration.php');
        upgrade_template_migration();
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        change_field_notnull(new XMLDBTAble('view_artefact'), new XMLDBTable('block'));
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        $table = new XMLDBTable('view_artefact');
        $field = new XMLDBField('oldblock');
        drop_field($table, $field);

        $table = new XMLDBTable('view');
        $field = new XMLDBField('template');
        drop_field($table, $field);

        $table = new XMLDBTable('view_content');
        drop_table($table);

        $table = new XMLDBTable('template');
        drop_table($table);
        
        $table = new XMLDBTable('template_category');
        drop_table($table);

        $table = new XMLDBTable('view_artefact');
        $field = new XMLDBField('ctime');
        drop_field($table, $field);

        $field = new XMLDBField('format');
        drop_field($table, $field);
    
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    }

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    // Move files in dataroot into an 'originals' directory, and remove any 
    // cached images
    if ($oldversion < 2007082202) {
        require('file.php');
        foreach(array('artefact/file', 'artefact/internal/profileicons') as $dir) {
            $datadir = get_config('dataroot') . $dir;
            check_dir_exists("$datadir/originals");
            check_dir_exists("$datadir/resized");
            foreach (new DirectoryIterator($datadir) as $folder) {
                $name = $folder->getFilename();
                if (preg_match('/^\d+$/', $name)) {
                    log_debug("$dir: Moving folder {$name} to ${datadir}/originals");
                    rename("{$datadir}/{$name}", "{$datadir}/originals/{$name}");
                }
                else if (preg_match('/^\d+x\d+$/', $name)) {
                    log_debug("$dir: Deleting folder {$name}");
                    rmdirr("{$datadir}/{$name}");
                }
            }
        }

        // Last part - setting config variables for max width/height for images
        set_config('imagemaxwidth', 1024);
        set_config('imagemaxheight', 1024);
    }

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    if ($oldversion < 2007112300) {

        $table = new XMLDBTable('usr_institution');
        $table->addFieldInfo('usr', XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('institution', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('ctime', XMLDB_TYPE_DATETIME, null, null);
        $table->addFieldInfo('expiry', XMLDB_TYPE_DATETIME, null, null);
        $table->addFieldInfo('studentid', XMLDB_TYPE_TEXT, null);
        $table->addFieldInfo('staff', XMLDB_TYPE_INTEGER, 1, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, 0);
        $table->addFieldInfo('admin', XMLDB_TYPE_INTEGER, 1, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, 0);
        $table->addKeyInfo('usrfk', XMLDB_KEY_FOREIGN, array('usr'), 'usr', array('id'));
        $table->addKeyInfo('institutionfk', XMLDB_KEY_FOREIGN, array('institution'), 'institution', array('name'));
        $table->addKeyInfo('usrinstitutionuk', XMLDB_KEY_UNIQUE, array('usr', 'institution'));
        create_table($table);

        $table = new XMLDBTable('usr_institution_request');
        $table->addFieldInfo('usr', XMLDB_TYPE_INTEGER, 10, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('institution', XMLDB_TYPE_CHAR, 255, XMLDB_UNSIGNED, XMLDB_NOTNULL);
        $table->addFieldInfo('confirmedusr', XMLDB_TYPE_INTEGER, 1, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, 0);
        $table->addFieldInfo('confirmedinstitution', XMLDB_TYPE_INTEGER, 1, XMLDB_UNSIGNED, XMLDB_NOTNULL, null, null, null, 0);
        $table->addFieldInfo('studentid', XMLDB_TYPE_TEXT, null);
        $table->addFieldInfo('ctime', XMLDB_TYPE_DATETIME, null, null);
        $table->addKeyInfo('usrfk', XMLDB_KEY_FOREIGN, array('usr'), 'usr', array('id'));
        $table->addKeyInfo('institutionfk', XMLDB_KEY_FOREIGN, array('institution'), 'institution', array('name'));
        $table->addKeyInfo('usrinstitutionuk', XMLDB_KEY_UNIQUE, array('usr', 'institution'));
        create_table($table);

        $users = get_records_array('usr', '', '', '', 'id, username, institution, lastlogin, expiry, studentid, staff, admin, email, firstname, lastname');
        if ($users) {
            $usernames = get_column_sql("SELECT DISTINCT username FROM {usr}");
            $newusernames = array();
            $renamed = array();
            // Create new usr_institution records for every non-default institution
            // Make usernames unique
            foreach ($users as $u) {
                if ($u->institution != 'mahara') {
                    $ui = (object) array(
                        'usr' => $u->id,
                        'institution' => $u->institution,
                        'expiry' => $u->expiry,
                        'studentid' => $u->studentid,
                        'staff' => $u->staff,
                        'admin' => $u->admin
                    );
                    insert_record('usr_institution', $ui);
                }
                if (!isset($newusernames[$u->username])) {
                    $newname = $u->username;
                } else { // Rename the user
                    $newname = false;
                    if ($u->institution != 'mahara') { // First try prepending the institution
                        $try = $u->institution . $u->username;
                        if (strlen($try) <= 30 && !isset($newusernames[$try]) && !isset($usernames[$try])) {
                            $newname = $try;
                        }
                    }
                    if ($newname == false) { // Append digits keeping total length <= 30
                        $i = 1;
                        $newname = substr($u->username, 0, 29) . $i;
                        while (isset($newusernames[$newname]) || isset($usernames[$newname])) {
                            $i++;
                            $newname = substr($u->username, 0, 30 - floor(log10($i)+1)) . $i;
                        }
                    }
                    set_field('usr', 'username', $newname, 'id', $u->id);
                    $renamed[$newname] = $u;
                }
                $newusernames[$newname] = true;
            }
        }

        execute_sql('DROP INDEX {usr_useaut_uix};');
        execute_sql('CREATE UNIQUE INDEX {usr_use_uix} ON {usr} (username);');
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        execute_sql('ALTER TABLE {usr} DROP COLUMN institution;');
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        if (!empty($renamed)) {
            // Notify changed usernames to administrator
            $report = '# Each line in this file is in the form "institution old_username new_username"'."\n";
            $message = "Mahara now requires usernames to be unique.\n";
            $message .= "Some usernames on your site were changed during the upgrade:\n\n";
            foreach ($renamed as $newname => $olduser) {
                $report .= "$olduser->institution $olduser->username $newname\n";
                $message .= "Institution: $olduser->institution\n"
                    . "Old username: $olduser->username\n"
                    . "New username: $newname\n\n";
            }
            $sitename = get_config('sitename');
            $file = get_config('dataroot') . 'user_migration_report.txt';
            if (file_put_contents($file, $report)) {
                $message .= "\n" . 'A copy of this list has been saved to the file ' . $file;
            }
            global $USER;
            email_user($USER, null, $sitename . ': User migration', $message);
            // Notify changed usernames to users
            $usermessagestart = "Your username at $sitename has been changed:\n\n";
            $usermessageend = "\n\nNext time you visit the site, please login using your new username.";
            foreach ($renamed as $newname => $olduser) {
                if (empty($olduser->email)) {
                    continue;
                }
                email_user($olduser, null, $sitename, $usermessagestart
                           . "Old username: $olduser->username\nNew username: $newname"
                           . $usermessageend);
            }
        }
    }

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    if ($oldversion < 2007112600) {

        // Move site-wide stuff from institution table to config table
        $default = get_record('institution', 'name', 'mahara');
        $c = new StdClass;
        $c->field = 'defaultaccountinactivewarn';
        $c->value = empty($default->defaultaccountinactivewarn) ? 604800 : $default->defaultaccountinactivewarn;
        insert_record('config', $c);
        if (!empty($default->defaultaccountlifetime)) {
            $c->field = 'defaultaccountlifetime';
            $c->value = $default->defaultaccountlifetime;
            insert_record('config', $c);
        }
        if (!empty($default->defaultaccountinactiveexpire)) {
            $c->field = 'defaultaccountinactiveexpire';
            $c->value = $default->defaultaccountinactiveexpire;
            insert_record('config', $c);
        }

        execute_sql('ALTER TABLE {institution} DROP COLUMN defaultaccountlifetime;');
        execute_sql('ALTER TABLE {institution} DROP COLUMN defaultaccountinactiveexpire;');
        execute_sql('ALTER TABLE {institution} DROP COLUMN defaultaccountinactivewarn;');

        // Add theme, default institution membership period to institution table
        execute_sql('ALTER TABLE {institution} ADD COLUMN theme varchar(255)');
        execute_sql('ALTER TABLE {institution} ADD COLUMN defaultmembershipperiod bigint');
    }

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    return $status;

}
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?>