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	diff --git a/installer/config.php b/installer/config.php
	index d922fe66b..5ba6fd3e6 100644
	--- a/installer/config.php
	+++ b/installer/config.php
	@@ -1,656 +1,647 @@
	<?php

	/**
	+-----------------------------------------------------------------------+
	\| This file is part of the Roundcube Webmail client \|
	\| \|
	\| Copyright (C) The Roundcube Dev Team \|
	\| \|
	\| Licensed under the GNU General Public License version 3 or \|
	\| any later version with exceptions for skins & plugins. \|
	\| See the README file for a full license statement. \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	+-----------------------------------------------------------------------+
	*/

	if (!class_exists('rcmail_install', false) \|\| !isset($RCI)) {
	die("Not allowed! Please open installer/index.php instead.");
	}

	-// register these boolean fields
	-$RCI->bool_config_props = [
	- 'ip_check' => 1,
	- 'enable_spellcheck' => 1,
	- 'auto_create_user' => 1,
	- 'smtp_log' => 1,
	- 'prefer_html' => 1,
	-];
	-
	// allow the current user to get to the next step
	$_SESSION['allowinstaller'] = true;

	if (!empty($_POST['submit'])) {
	$_SESSION['config'] = $RCI->create_config();

	if ($RCI->save_configfile($_SESSION['config'])) {
	echo '<p class="notice">The config file was saved successfully into'
	. ' <tt>'.RCMAIL_CONFIG_DIR.'</tt> directory of your Roundcube installation.';

	if ($RCI->legacy_config) {
	echo '<br/><br/>Afterwards, please <b>remove</b> the old configuration files'
	. ' <tt>main.inc.php</tt> and <tt>db.inc.php</tt> from the config directory.';
	}

	echo '</p>';
	}
	else {
	$save_button = '';
	if (($dir = sys_get_temp_dir()) && @is_writable($dir)) {
	echo '<iframe name="getconfig" style="display:none"></iframe>';
	echo '<form id="getconfig_form" action="index.php" method="get" target="getconfig" style="display:none">';
	echo '<input name="_getconfig" value="2" /></form>';

	$button_txt = html::quote('Save in ' . $dir);
	$save_button = ' <input type="button" onclick="document.getElementById(\'getconfig_form\').submit()" value="' . $button_txt . '" />';
	}

	echo '<p class="notice">Copy or download the following configuration and save it';
	echo ' as <tt><b>config.inc.php</b></tt> within the <tt>'.RCUBE_CONFIG_DIR.'</tt> directory of your Roundcube installation.<br/>';
	echo ' Make sure that there are no characters before the <tt><?php</tt> bracket when saving the file.';
	echo ' <input type="button" onclick="location.href=\'index.php?_getconfig=1\'" value="Download" />';
	echo $save_button;

	if ($RCI->legacy_config) {
	echo '<br/><br/>Afterwards, please <b>remove</b> the old configuration files'
	. ' <tt>main.inc.php</tt> and <tt>db.inc.php</tt> from the config directory.';
	}

	echo '</p>';

	$textbox = new html_textarea(['rows' => 16, 'cols' => 60, 'class' => 'configfile']);
	echo $textbox->show(($_SESSION['config']));
	}

	echo '<p class="hint">Of course there are more options to configure.
	Have a look at the defaults.inc.php file or visit <a href="https://github.com/roundcube/roundcubemail/wiki/Configuration" target="_blank">Howto_Config</a> to find out.</p>';

	echo '<p><input type="button" onclick="location.href=\'./index.php?_step=3\'" value="CONTINUE" /></p>';

	// echo '<style type="text/css"> .configblock { display:none } </style>';
	echo "\n<hr style='margin-bottom:1.6em' />\n";
	}

	?>
	<form action="index.php" method="post">
	<input type="hidden" name="_step" value="2" />

	<fieldset>
	<legend>General configuration</legend>
	<dl class="configblock">

	<dt class="propname">product_name</dt>
	<dd>
	<?php

	$input_prodname = new html_inputfield(['name' => '_product_name', 'size' => 30, 'id' => 'cfgprodname']);
	echo $input_prodname->show($RCI->getprop('product_name'));

	?>
	<div>The name of your service (used to compose page titles)</div>
	</dd>

	<dt class="propname">support_url</dt>
	<dd>
	<?php

	$input_support = new html_inputfield(['name' => '_support_url', 'size' => 50, 'id' => 'cfgsupporturl']);
	echo $input_support->show($RCI->getprop('support_url'));

	?>
	<div>Provide a URL where a user can get support for this Roundcube installation.<br/>PLEASE DO NOT LINK TO THE ROUNDCUBE.NET WEBSITE HERE!</div>
	<p class="hint">Enter an absolute URL (including http://) to a support page/form or a mailto: link.</p>
	</dd>

	<dt class="propname">temp_dir</dt>
	<dd>
	<?php

	$input_tempdir = new html_inputfield(['name' => '_temp_dir', 'size' => 30, 'id' => 'cfgtempdir']);
	echo $input_tempdir->show($RCI->getprop('temp_dir'));

	?>
	<div>Use this folder to store temp files (must be writeable for webserver)</div>
	</dd>

	<dt class="propname">des_key</dt>
	<dd>
	<?php

	$input_deskey = new html_inputfield(['name' => '_des_key', 'size' => 30, 'id' => 'cfgdeskey']);
	echo $input_deskey->show($RCI->getprop('des_key'));

	?>
	<div>This key is used to encrypt the users imap password before storing in the session record</div>
	<p class="hint">It's a random generated string to ensure that every installation has its own key.</p>
	</dd>

	<dt class="propname">ip_check</dt>
	<dd>
	<?php

	$check_ipcheck = new html_checkbox(['name' => '_ip_check', 'id' => 'cfgipcheck']);
	echo $check_ipcheck->show(intval($RCI->getprop('ip_check')), array('value' => 1));

	?>
	<label for="cfgipcheck">Check client IP in session authorization</label><br />

	<p class="hint">This increases security but can cause sudden logouts when someone uses a proxy with changing IPs.</p>
	</dd>

	<dt class="propname">enable_spellcheck</dt>
	<dd>
	<?php
	$check_spell = new html_checkbox(['name' => '_enable_spellcheck', 'id' => 'cfgspellcheck']);
	echo $check_spell->show(intval($RCI->getprop('enable_spellcheck')), ['value' => 1]);
	?>

	<label for="cfgspellcheck">Make use of the spell checker</label><br />
	</dd>

	<dt class="propname">spellcheck_engine</dt>
	<dd>

	<?php
	$select_spell = new html_select(['name' => '_spellcheck_engine', 'id' => 'cfgspellcheckengine']);
	if (extension_loaded('pspell')) {
	$select_spell->add('Pspell', 'pspell');
	}
	if (extension_loaded('enchant')) {
	$select_spell->add('Enchant', 'enchant');
	}
	$select_spell->add('Googie', 'googie');
	$select_spell->add('ATD', 'atd');

	echo $select_spell->show($RCI->is_post ? $_POST['_spellcheck_engine'] : 'pspell');
	?>

	<div>Which spell checker to use</div>
	<p class="hint">Googie implies that the message content will be sent to external server to check the spelling.</p>
	</dd>

	<dt class="propname">identities_level</dt>
	<dd>

	<?php

	$input_ilevel = new html_select(['name' => '_identities_level', 'id' => 'cfgidentitieslevel']);
	$input_ilevel->add('many identities with possibility to edit all params', 0);
	$input_ilevel->add('many identities with possibility to edit all params but not email address', 1);
	$input_ilevel->add('one identity with possibility to edit all params', 2);
	$input_ilevel->add('one identity with possibility to edit all params but not email address', 3);
	$input_ilevel->add('one identity with possibility to edit only signature', 4);
	echo $input_ilevel->show($RCI->getprop('identities_level'), 0);

	?>

	<div>Level of identities access</div>
	<p class="hint">Defines what users can do with their identities.</p>
	</dd>

	</dl>
	</fieldset>

	<fieldset>
	<legend>Logging & Debugging</legend>
	<dl class="loggingblock">

	<dt class="propname">log_driver</dt>
	<dd>

	<?php
	$select_log_driver = new html_select(['name' => '_log_driver', 'id' => 'cfglogdriver']);
	$select_log_driver->add(['file', 'syslog', 'stdout'], ['file', 'syslog', 'stdout']);
	echo $select_log_driver->show($RCI->getprop('log_driver', 'file'));
	?>

	<div>How to do logging? 'file' - write to files in the log directory, 'syslog' - use the syslog facility, 'stdout' writes to the process' STDOUT file descriptor.</div>
	</dd>

	<dt class="propname">log_dir</dt>
	<dd>
	<?php

	$input_logdir = new html_inputfield(['name' => '_log_dir', 'size' => 30, 'id' => 'cfglogdir']);
	echo $input_logdir->show($RCI->getprop('log_dir'));

	?>
	<div>Use this folder to store log files (must be writeable for webserver). Note that this only applies if you are using the 'file' log_driver.</div>
	</dd>

	<dt class="propname">syslog_id</dt>
	<dd>
	<?php

	$input_syslogid = new html_inputfield(['name' => '_syslog_id', 'size' => 30, 'id' => 'cfgsyslogid']);
	echo $input_syslogid->show($RCI->getprop('syslog_id', 'roundcube'));

	?>
	<div>What ID to use when logging with syslog. Note that this only applies if you are using the 'syslog' log_driver.</div>
	</dd>

	<dt class="propname">syslog_facility</dt>
	<dd>
	<?php

	$input_syslogfacility = new html_select(['name' => '_syslog_facility', 'id' => 'cfgsyslogfacility']);
	$input_syslogfacility->add('user-level messages', LOG_USER);
	if (defined('LOG_MAIL')) {
	$input_syslogfacility->add('mail subsystem', LOG_MAIL);
	}
	if (defined('LOG_LOCAL0')) {
	$input_syslogfacility->add('local level 0', LOG_LOCAL0);
	$input_syslogfacility->add('local level 1', LOG_LOCAL1);
	$input_syslogfacility->add('local level 2', LOG_LOCAL2);
	$input_syslogfacility->add('local level 3', LOG_LOCAL3);
	$input_syslogfacility->add('local level 4', LOG_LOCAL4);
	$input_syslogfacility->add('local level 5', LOG_LOCAL5);
	$input_syslogfacility->add('local level 6', LOG_LOCAL6);
	$input_syslogfacility->add('local level 7', LOG_LOCAL7);
	}
	echo $input_syslogfacility->show($RCI->getprop('syslog_facility'), LOG_USER);

	?>
	<div>What ID to use when logging with syslog. Note that this only applies if you are using the 'syslog' log_driver.</div>
	</dd>

	</dl>
	</fieldset>

	<fieldset>
	<legend>Database setup</legend>
	<dl class="configblock" id="cgfblockdb">
	<dt class="propname">db_dsnw</dt>
	<dd>
	<p>Database settings for read/write operations:</p>
	<?php

	$select_dbtype = new html_select(['name' => '_dbtype', 'id' => 'cfgdbtype']);
	foreach ($RCI->supported_dbs as $database => $ext) {
	if (extension_loaded($ext)) {
	$select_dbtype->add($database, substr($ext, 4));
	}
	}

	$input_dbhost = new html_inputfield(['name' => '_dbhost', 'size' => 20, 'id' => 'cfgdbhos']);
	$input_dbname = new html_inputfield(['name' => '_dbname', 'size' => 20, 'id' => 'cfgdbname']);
	$input_dbuser = new html_inputfield(['name' => '_dbuser', 'size' => 20, 'id' => 'cfgdbuser']);
	$input_dbpass = new html_inputfield(['name' => '_dbpass', 'size' => 20, 'id' => 'cfgdbpass']);

	$dsnw = rcube_db::parse_dsn($RCI->getprop('db_dsnw'));

	echo $select_dbtype->show($RCI->is_post ? $_POST['_dbtype'] : $dsnw['phptype']);
	echo '<label for="cfgdbtype">Database type</label><br />';
	echo $input_dbhost->show($RCI->is_post ? $_POST['_dbhost'] : $dsnw['hostspec']);
	echo '<label for="cfgdbhost">Database server (omit for sqlite)</label><br />';
	echo $input_dbname->show($RCI->is_post ? $_POST['_dbname'] : $dsnw['database']);
	echo '<label for="cfgdbname">Database name (use absolute path and filename for sqlite)</label><br />';
	echo $input_dbuser->show($RCI->is_post ? $_POST['_dbuser'] : $dsnw['username']);
	echo '<label for="cfgdbuser">Database user name (needs write permissions)(omit for sqlite)</label><br />';
	echo $input_dbpass->show($RCI->is_post ? $_POST['_dbpass'] : $dsnw['password']);
	echo '<label for="cfgdbpass">Database password (omit for sqlite)</label><br />';

	?>
	</dd>

	<dt class="propname">db_prefix</dt>
	<dd>
	<?php

	$input_prefix = new html_inputfield(['name' => '_db_prefix', 'size' => 20, 'id' => 'cfgdbprefix']);
	echo $input_prefix->show($RCI->getprop('db_prefix'));

	?>
	<div>Optional prefix that will be added to database object names (tables and sequences).</div>
	</dd>

	</dl>
	</fieldset>


	<fieldset>
	<legend>IMAP Settings</legend>
	<dl class="configblock" id="cgfblockimap">
	<dt class="propname">imap_host</dt>
	<dd>
	<div id="defaulthostlist">
	<?php

	$text_imaphost = new html_inputfield(['name' => '_imap_host[]', 'size' => 30]);
	$default_hosts = $RCI->get_hostlist();

	if (empty($default_hosts)) {
	$default_hosts = [''];
	}

	$i = 0;
	foreach ($default_hosts as $host) {
	echo '<div id="defaulthostentry'.$i.'">' . $text_imaphost->show($host);
	if ($i++ > 0) {
	echo '<a href="#" onclick="removehostfield(this.parentNode);return false" class="removelink" title="Remove this entry">remove</a>';
	}
	echo '</div>';
	}

	?>
	</div>
	<div><a href="javascript:addhostfield()" class="addlink" title="Add another field">add</a></div>

	<div>The IMAP host(s) chosen to perform the log-in</div>
	<p class="hint">Leave blank to show a textbox at login. To use SSL/STARTTLS connection add ssl:// or tls:// prefix. It can also contain the port number, e.g. tls://imap.domain.tld:143.
	</dd>

	<dt class="propname">username_domain</dt>
	<dd>
	<?php

	$text_userdomain = new html_inputfield(['name' => '_username_domain', 'size' => 30, 'id' => 'cfguserdomain']);
	echo $text_userdomain->show($RCI->getprop('username_domain'));

	?>
	<div>Automatically add this domain to user names for login</div>

	<p class="hint">Only for IMAP servers that require full e-mail addresses for login</p>
	</dd>

	<dt class="propname">auto_create_user</dt>
	<dd>
	<?php

	$check_autocreate = new html_checkbox(['name' => '_auto_create_user', 'id' => 'cfgautocreate']);
	echo $check_autocreate->show(intval($RCI->getprop('auto_create_user')), ['value' => 1]);

	?>
	<label for="cfgautocreate">Automatically create a new Roundcube user when log-in the first time</label><br />

	<p class="hint">A user is authenticated by the IMAP server but it requires a local record to store settings
	and contacts. With this option enabled a new user record will automatically be created once the IMAP login succeeds.</p>

	<p class="hint">If this option is disabled, the login only succeeds if there's a matching user-record in the local Roundcube database
	what means that you have to create those records manually or disable this option after the first login.</p>
	</dd>

	<dt class="propname">sent_mbox</dt>
	<dd>
	<?php

	$text_sentmbox = new html_inputfield(['name' => '_sent_mbox', 'size' => 20, 'id' => 'cfgsentmbox']);
	echo $text_sentmbox->show($RCI->getprop('sent_mbox'));

	?>
	<div>Store sent messages in this folder</div>

	<p class="hint">Leave blank if sent messages should not be stored. Note: folder must include namespace prefix if any.</p>
	</dd>

	<dt class="propname">trash_mbox</dt>
	<dd>
	<?php

	$text_trashmbox = new html_inputfield(['name' => '_trash_mbox', 'size' => 20, 'id' => 'cfgtrashmbox']);
	echo $text_trashmbox->show($RCI->getprop('trash_mbox'));

	?>
	<div>Move messages to this folder when deleting them</div>

	<p class="hint">Leave blank if they should be deleted directly. Note: folder must include namespace prefix if any.</p>
	</dd>

	<dt class="propname">drafts_mbox</dt>
	<dd>
	<?php

	$text_draftsmbox = new html_inputfield(['name' => '_drafts_mbox', 'size' => 20, 'id' => 'cfgdraftsmbox']);
	echo $text_draftsmbox->show($RCI->getprop('drafts_mbox'));

	?>
	<div>Store draft messages in this folder</div>

	<p class="hint">Leave blank if they should not be stored. Note: folder must include namespace prefix if any.</p>
	</dd>

	<dt class="propname">junk_mbox</dt>
	<dd>
	<?php

	$text_junkmbox = new html_inputfield(['name' => '_junk_mbox', 'size' => 20, 'id' => 'cfgjunkmbox']);
	echo $text_junkmbox->show($RCI->getprop('junk_mbox'));

	?>
	<div>Store spam messages in this folder</div>

	<p class="hint">Note: folder must include namespace prefix if any.</p>
	</dd>

	</dd>
	</dl>
	</fieldset>

	<fieldset>
	<legend>SMTP Settings</legend>
	<dl class="configblock" id="cgfblocksmtp">
	<dt class="propname">smtp_host</dt>
	<dd>
	<?php

	$text_smtphost = new html_inputfield(['name' => '_smtp_host', 'size' => 30, 'id' => 'cfgsmtphost']);
	echo $text_smtphost->show($RCI->getprop('smtp_host', 'localhost:587'));

	?>
	<div>Use this host for sending mails</div>
	<p class="hint">To use SSL/STARTTLS connection add ssl:// or tls:// prefix. It can also contain the port number, e.g. tls://smtp.domain.tld:587.</p>
	</dd>

	<dt class="propname">smtp_user/smtp_pass</dt>
	<dd>
	<?php

	$text_smtpuser = new html_inputfield(['name' => '_smtp_user', 'size' => 20, 'id' => 'cfgsmtpuser']);
	$text_smtppass = new html_inputfield(['name' => '_smtp_pass', 'size' => 20, 'id' => 'cfgsmtppass']);
	echo $text_smtpuser->show($RCI->getprop('smtp_user'));
	echo $text_smtppass->show($RCI->getprop('smtp_pass'));

	?>
	<div>SMTP username and password (if required)</div>
	<p>
	<?php

	$check_smtpuser = new html_checkbox(['name' => '_smtp_user_u', 'id' => 'cfgsmtpuseru']);
	echo $check_smtpuser->show($RCI->getprop('smtp_user') == '%u' \|\| !empty($_POST['_smtp_user_u']) ? 1 : 0, ['value' => 1]);

	?>
	<label for="cfgsmtpuseru">Use the current IMAP username and password for SMTP authentication</label>
	</p>
	</dd>

	<dt class="propname">smtp_log</dt>
	<dd>
	<?php

	$check_smtplog = new html_checkbox(['name' => '_smtp_log', 'id' => 'cfgsmtplog']);
	echo $check_smtplog->show(intval($RCI->getprop('smtp_log')), ['value' => 1]);

	?>
	<label for="cfgsmtplog">Log sent messages in <tt>{log_dir}/sendmail</tt> or to syslog.</label><br />
	</dd>

	</dl>
	</fieldset>


	<fieldset>
	<legend>Display settings & user prefs</legend>
	<dl class="configblock" id="cgfblockdisplay">

	<dt class="propname">language <span class="userconf">*</span></dt>
	<dd>
	<?php

	$input_locale = new html_inputfield(['name' => '_language', 'size' => 6, 'id' => 'cfglocale']);
	echo $input_locale->show($RCI->getprop('language'));

	?>
	<div>The default locale setting. This also defines the language of the login screen.<br/>Leave it empty to auto-detect the user agent language.</div>
	<p class="hint">Enter a <a href="http://www.faqs.org/rfcs/rfc1766">RFC1766</a> formatted language name. Examples: en_US, de_DE, de_CH, fr_FR, pt_BR</p>
	</dd>

	<dt class="propname">skin <span class="userconf">*</span></dt>
	<dd>
	<?php

	$input_skin = new html_select(['name' => '_skin', 'id' => 'cfgskin']);
	$skins = $RCI->list_skins();
	$input_skin->add($skins, $skins);
	echo $input_skin->show($RCI->getprop('skin'));

	?>
	<div>Name of interface skin (folder in /skins)</div>
	</dd>

	<dt class="propname">mail_pagesize <span class="userconf">*</span></dt>
	<dd>
	<?php

	$pagesize = $RCI->getprop('mail_pagesize');
	if (!$pagesize) {
	$pagesize = $RCI->getprop('pagesize');
	}
	$input_pagesize = new html_inputfield(['name' => '_mail_pagesize', 'size' => 6, 'id' => 'cfgmailpagesize']);
	echo $input_pagesize->show($pagesize);

	?>
	<div>Show up to X items in the mail messages list view.</div>
	</dd>

	<dt class="propname">addressbook_pagesize <span class="userconf">*</span></dt>
	<dd>
	<?php

	$pagesize = $RCI->getprop('addressbook_pagesize');
	if (!$pagesize) {
	$pagesize = $RCI->getprop('pagesize');
	}
	$input_pagesize = new html_inputfield(['name' => '_addressbook_pagesize', 'size' => 6, 'id' => 'cfgabookpagesize']);
	echo $input_pagesize->show($pagesize);

	?>
	<div>Show up to X items in the contacts list view.</div>
	</dd>

	<dt class="propname">prefer_html <span class="userconf">*</span></dt>
	<dd>
	<?php

	$check_htmlview = new html_checkbox(['name' => '_prefer_html', 'id' => 'cfghtmlview', 'value' => 1]);
	echo $check_htmlview->show(intval($RCI->getprop('prefer_html')));

	?>
	<label for="cfghtmlview">Prefer displaying HTML messages</label><br />
	</dd>

	<dt class="propname">htmleditor <span class="userconf">*</span></dt>
	<dd>
	<label for="cfghtmlcompose">Compose HTML formatted messages</label>
	<?php

	$select_htmlcomp = new html_select(['name' => '_htmleditor', 'id' => 'cfghtmlcompose']);
	$select_htmlcomp->add('never', 0);
	$select_htmlcomp->add('always', 1);
	$select_htmlcomp->add('on reply to HTML message only', 2);
	echo $select_htmlcomp->show(intval($RCI->getprop('htmleditor')));

	?>
	</dd>

	<dt class="propname">draft_autosave <span class="userconf">*</span></dt>
	<dd>
	<label for="cfgautosave">Save compose message every</label>
	<?php

	$select_autosave = new html_select(['name' => '_draft_autosave', 'id' => 'cfgautosave']);
	$select_autosave->add('never', 0);
	foreach ([1, 3, 5, 10] as $i => $min) {
	$select_autosave->add("$min min", $min * 60);
	}

	echo $select_autosave->show(intval($RCI->getprop('draft_autosave')));

	?>
	</dd>

	<dt class="propname">mdn_requests <span class="userconf">*</span></dt>
	<dd>
	<?php

	$mdn_opts = [
	0 => 'ask the user',
	1 => 'send automatically',
	3 => 'send receipt to user contacts, otherwise ask the user',
	4 => 'send receipt to user contacts, otherwise ignore',
	2 => 'ignore',
	];

	$select_mdnreq = new html_select(['name' => '_mdn_requests', 'id' => 'cfgmdnreq']);
	$select_mdnreq->add(array_values($mdn_opts), array_keys($mdn_opts));
	echo $select_mdnreq->show(intval($RCI->getprop('mdn_requests')));

	?>
	<div>Behavior if a received message requests a message delivery notification (read receipt)</div>
	</dd>

	<dt class="propname">mime_param_folding <span class="userconf">*</span></dt>
	<dd>
	<?php

	$select_param_folding = new html_select(['name' => '_mime_param_folding', 'id' => 'cfgmimeparamfolding']);
	$select_param_folding->add('Full RFC 2231 (Roundcube, Thunderbird)', '0');
	$select_param_folding->add('RFC 2047/2231 (MS Outlook, OE)', '1');
	$select_param_folding->add('Full RFC 2047 (deprecated)', '2');

	echo $select_param_folding->show(strval($RCI->getprop('mime_param_folding')));

	?>
	<div>How to encode attachment long/non-ascii names</div>
	</dd>

	</dl>

	<p class="hint"><span class="userconf">*</span>  These settings are defaults for the user preferences</p>
	</fieldset>

	<fieldset>
	<legend>Plugins</legend>
	<dl class="configblock" id="cgfblockdisplay">

	<?php
	$plugins = $RCI->list_plugins();
	foreach ($plugins as $p) {
	$p_check = new html_checkbox(['name' => '_plugins_'.$p['name'], 'id' => 'cfgplugin_'.$p['name'], 'value' => $p['name']]);
	echo '<dt class="propname"><label>';
	echo $p_check->show($p['enabled'] ? $p['name'] : 0);
	echo ' ' . $p['name'] . '</label></dt><dd>';
	echo '<label for="cfgplugin_'.$p['name'].'" class="hint">' . $p['desc'] . '</label><br/></dd>';
	}

	?>
	</dl>

	<p class="hint">Please consider checking dependencies of enabled plugins</p>
	</fieldset>

	<?php

	echo '<p><input type="submit" name="submit" value="' . ($RCI->configured ? 'UPDATE' : 'CREATE') . ' CONFIG" ' . ($RCI->failures ? 'disabled' : '') . ' /></p>';

	?>
	</form>
	diff --git a/program/include/rcmail_install.php b/program/include/rcmail_install.php
	index 80fa9ff3f..b6629ec85 100644
	--- a/program/include/rcmail_install.php
	+++ b/program/include/rcmail_install.php
	@@ -1,889 +1,904 @@
	<?php

	/**
	+-----------------------------------------------------------------------+
	\| This file is part of the Roundcube Webmail client \|
	\| \|
	\| Copyright (C) The Roundcube Dev Team \|
	\| \|
	\| Licensed under the GNU General Public License version 3 or \|
	\| any later version with exceptions for skins & plugins. \|
	\| See the README file for a full license statement. \|
	\| \|
	\| PURPOSE: \|
	\| Roundcube Installer \|
	+-----------------------------------------------------------------------+
	\| Author: Thomas Bruederli <roundcube@gmail.com> \|
	\| Author: Aleksander Machniak <alec@alec.pl> \|
	+-----------------------------------------------------------------------+
	*/

	/**
	* Class to control the installation process of the Roundcube Webmail package
	*
	* @category Install
	* @package Webmail
	*/
	class rcmail_install
	{
	public $step;
	public $last_error;
	public $is_post = false;
	public $failures = 0;
	public $config = [];
	public $defaults = [];
	public $comments = [];
	public $configured = false;
	public $legacy_config = false;
	public $email_pattern = '([a-z0-9][a-z0-9\-\.\+\_]@[a-z0-9]([a-z0-9\-][.]?)[a-z0-9])';
	- public $bool_config_props = [];
	+
	+ public $bool_config_props = [
	+ 'ip_check' => 1,
	+ 'enable_spellcheck' => 1,
	+ 'auto_create_user' => 1,
	+ 'smtp_log' => 1,
	+ 'prefer_html' => 1,
	+ ];

	public $local_config = ['db_dsnw', 'imap_host', 'support_url', 'des_key', 'plugins'];
	public $obsolete_config = ['db_backend', 'db_max_length', 'double_auth', 'preview_pane', 'debug_level', 'referer_check'];
	public $replaced_config = [
	'skin_path' => 'skin',
	'locale_string' => 'language',
	'multiple_identities' => 'identities_level',
	'addrbook_show_images' => 'show_images',
	'imap_root' => 'imap_ns_personal',
	'pagesize' => 'mail_pagesize',
	'top_posting' => 'reply_mode',
	'keep_alive' => 'refresh_interval',
	'min_keep_alive' => 'min_refresh_interval',
	'default_host' => 'imap_host',
	'smtp_server' => 'smtp_host',
	];

	+ // List of configuration options supported by the Installer
	+ public $supported_config = [
	+ 'product_name', 'support_url', 'temp_dir', 'des_key', 'ip_check', 'enable_spellcheck',
	+ 'spellcheck_engine', 'identities_level', 'log_driver', 'log_dir', 'syslog_id',
	+ 'syslog_facility', 'db_dsnw', 'db_prefix', 'imap_host', 'username_domain',
	+ 'auto_create_user', 'sent_mbox', 'trash_mbox', 'drafts_mbox', 'junk_mbox',
	+ 'smtp_host', 'smtp_user', 'smtp_pass', 'smtp_log', 'language', 'skin', 'mail_pagesize',
	+ 'addressbook_pagesize', 'prefer_html', 'htmleditor', 'draft_autosave', 'mdn_requests',
	+ 'mime_param_folding', 'plugins',
	+ ];
	+
	// list of supported database drivers
	public $supported_dbs = [
	'MySQL' => 'pdo_mysql',
	'PostgreSQL' => 'pdo_pgsql',
	'SQLite' => 'pdo_sqlite',
	'SQLite (v2)' => 'pdo_sqlite2',
	'SQL Server (SQLSRV)' => 'pdo_sqlsrv',
	'SQL Server (DBLIB)' => 'pdo_dblib',
	'Oracle' => 'oci8',
	];

	/** @var array List of config options with default value change per-release */
	public $defaults_changes = [
	'1.4.0' => ['skin', 'smtp_port', 'smtp_user', 'smtp_pass'],
	'1.4.1' => ['jquery_ui_skin_map'],
	];

	/**
	* Constructor
	*/
	public function __construct()
	{
	$this->step = isset($_REQUEST['_step']) ? intval($_REQUEST['_step']) : 0;
	$this->is_post = isset($_SERVER['REQUEST_METHOD']) && $_SERVER['REQUEST_METHOD'] == 'POST';
	}

	/**
	* Singleton getter
	*/
	public static function get_instance()
	{
	static $inst;

	if (!$inst) {
	$inst = new rcmail_install();
	}

	return $inst;
	}

	/**
	* Read the local config files and store properties
	*/
	public function load_config()
	{
	// defaults
	if ($config = $this->load_config_file(RCUBE_CONFIG_DIR . 'defaults.inc.php')) {
	$this->config = (array) $config;
	$this->defaults = $this->config;
	}

	$config = null;

	// config
	if ($config = $this->load_config_file(RCUBE_CONFIG_DIR . 'config.inc.php')) {
	$this->config = array_merge($this->config, $config);
	}
	else {
	if ($config = $this->load_config_file(RCUBE_CONFIG_DIR . 'main.inc.php')) {
	$this->config = array_merge($this->config, $config);
	$this->legacy_config = true;
	}

	if ($config = $this->load_config_file(RCUBE_CONFIG_DIR . 'db.inc.php')) {
	$this->config = array_merge($this->config, $config);
	$this->legacy_config = true;
	}
	}

	$this->configured = !empty($config);
	}

	/**
	* Read the default config file and store properties
	*
	* @param string $file File name with path
	*/
	public function load_config_file($file)
	{
	if (!is_readable($file)) {
	return;
	}

	$config = [];
	$rcmail_config = []; // deprecated var name

	include $file;

	// read comments from config file
	if (function_exists('token_get_all')) {
	$tokens = token_get_all(file_get_contents($file));
	$in_config = false;
	$buffer = '';

	for ($i = 0; $i < count($tokens); $i++) {
	$token = $tokens[$i];
	if ($token[0] == T_VARIABLE && ($token[1] == '$config' \|\| $token[1] == '$rcmail_config')) {
	$in_config = true;
	if ($buffer && $tokens[$i+1] == '[' && $tokens[$i+2][0] == T_CONSTANT_ENCAPSED_STRING) {
	$propname = trim($tokens[$i+2][1], "'\"");
	- $this->comments[$propname] = $buffer;
	+ $this->comments[$propname] = preg_replace('/\n\n/', "\n", $buffer);
	$buffer = '';
	$i += 3;
	}
	}
	else if ($in_config && $token[0] == T_COMMENT) {
	$buffer .= strtr($token[1], ['\n' => "\n"]) . "\n";
	}
	}
	}

	return array_merge((array) $rcmail_config, (array) $config);
	}

	/**
	* Getter for a certain config property
	*
	* @param string $name Property name
	* @param string $default Default value
	*
	* @return mixed The property value
	*/
	public function getprop($name, $default = '')
	{
	$value = $this->config[$name] ?? null;

	if ($name == 'des_key' && !$this->configured && !isset($_REQUEST["_$name"])) {
	$value = rcube_utils::random_bytes(24);
	}

	return $value !== null && $value !== '' ? $value : $default;
	}

	/**
	* Create configuration file that contains parameters
	* that differ from default values.
	*
	* @return string The complete config file content
	*/
	public function create_config()
	{
	$config = [];

	foreach ($this->config as $prop => $default) {
	- $is_default = !isset($_POST["_$prop"]);
	+ $is_default = !isset($_POST["_$prop"]) \|\| empty($this->supported_config[$prop]);
	$value = !$is_default \|\| $this->bool_config_props[$prop] ? $_POST["_$prop"] : $default;

	// always disable installer
	if ($prop == 'enable_installer') {
	$value = false;
	}

	// generate new encryption key, never use the default value
	if ($prop == 'des_key' && $value == $this->defaults[$prop]) {
	$value = rcube_utils::random_bytes(24);
	}

	// convert some form data
	if ($prop == 'db_dsnw' && !empty($_POST['_dbtype'])) {
	if ($_POST['_dbtype'] == 'sqlite') {
	$value = sprintf('%s://%s?mode=0646', $_POST['_dbtype'],
	$_POST['_dbname'][0] == '/' ? '/' . $_POST['_dbname'] : $_POST['_dbname']);
	}
	else if ($_POST['_dbtype']) {
	$value = sprintf('%s://%s:%s@%s/%s', $_POST['_dbtype'],
	rawurlencode($_POST['_dbuser']), rawurlencode($_POST['_dbpass']), $_POST['_dbhost'], $_POST['_dbname']);
	}
	}
	- else if ($prop == 'smtp_auth_type' && $value == '0') {
	- $value = '';
	- }
	else if ($prop == 'imap_host' && is_array($value)) {
	$value = self::_clean_array($value);
	if (count($value) <= 1) {
	$value = $value[0];
	}
	}
	else if ($prop == 'mail_pagesize' \|\| $prop == 'addressbook_pagesize') {
	$value = max(2, intval($value));
	}
	else if ($prop == 'smtp_user' && !empty($_POST['_smtp_user_u'])) {
	$value = '%u';
	}
	else if ($prop == 'smtp_pass' && !empty($_POST['_smtp_user_u'])) {
	$value = '%p';
	}
	else if (is_bool($default)) {
	$value = (bool) $value;
	}
	else if (is_numeric($value)) {
	$value = intval($value);
	}
	else if ($prop == 'plugins' && !empty($_POST['submit'])) {
	$value = [];
	foreach (array_keys($_POST) as $key) {
	if (preg_match('/^_plugins_*/', $key)) {
	array_push($value, $_POST[$key]);
	}
	}
	}

	// skip this property
	if ($value == $this->defaults[$prop]
	&& (!in_array($prop, $this->local_config)
	\|\| in_array($prop, array_merge($this->obsolete_config, array_keys($this->replaced_config)))
	\|\| preg_match('/^db_(table\|sequence)_/', $prop)
	)
	) {
	continue;
	}

	// save change
	$this->config[$prop] = $value;
	$config[$prop] = $value;
	}

	$out = "<?php\n\n";
	$out .= "/* Local configuration for Roundcube Webmail */\n\n";

	foreach ($config as $prop => $value) {
	// copy option descriptions from existing config or defaults.inc.php
	$out .= $this->comments[$prop];
	$out .= "\$config['$prop'] = " . self::_dump_var($value, $prop) . ";\n\n";
	}

	return $out;
	}

	/**
	* save generated config file in RCUBE_CONFIG_DIR
	*
	* @return boolean True if the file was saved successfully, false if not
	*/
	public function save_configfile($config)
	{
	if (is_writable(RCUBE_CONFIG_DIR)) {
	return file_put_contents(RCUBE_CONFIG_DIR . 'config.inc.php', $config);
	}

	return false;
	}

	/**
	* Check the current configuration for missing properties
	* and deprecated or obsolete settings
	*
	* @param string $version Previous version on upgrade
	*
	* @return array List with problems detected
	*/
	public function check_config($version = null)
	{
	$this->load_config();

	if (!$this->configured) {
	return;
	}

	$out = $seen = [];

	// iterate over the current configuration
	foreach (array_keys($this->config) as $prop) {
	if (!empty($this->replaced_config[$prop])) {
	$replacement = $this->replaced_config[$prop];
	$out['replaced'][] = ['prop' => $prop, 'replacement' => $replacement];
	$seen[$replacement] = true;
	}
	else if (empty($seen[$prop]) && in_array($prop, $this->obsolete_config)) {
	$out['obsolete'][] = ['prop' => $prop];
	$seen[$prop] = true;
	}
	}

	// the old default mime_magic reference is obsolete
	if ($this->config['mime_magic'] == '/usr/share/misc/magic') {
	$out['obsolete'][] = [
	'prop' => 'mime_magic',
	'explain' => "Set value to null in order to use system default"
	];
	}

	// check config dependencies and contradictions
	if (!empty($this->config['enable_spellcheck']) && $this->config['spellcheck_engine'] == 'pspell') {
	if (!extension_loaded('pspell')) {
	$out['dependencies'][] = [
	'prop' => 'spellcheck_engine',
	'explain' => "This requires the <tt>pspell</tt> extension which could not be loaded."
	];
	}
	else if (!empty($this->config['spellcheck_languages'])) {
	foreach ($this->config['spellcheck_languages'] as $lang => $descr) {
	if (!@pspell_new($lang)) {
	$out['dependencies'][] = [
	'prop' => 'spellcheck_languages',
	'explain' => "You are missing pspell support for language $lang ($descr)"
	];
	}
	}
	}
	}

	if ($this->config['log_driver'] == 'syslog') {
	if (!function_exists('openlog')) {
	$out['dependencies'][] = [
	'prop' => 'log_driver',
	'explain' => "This requires the <tt>syslog</tt> extension which could not be loaded."
	];
	}

	if (empty($this->config['syslog_id'])) {
	$out['dependencies'][] = [
	'prop' => 'syslog_id',
	'explain' => "Using <tt>syslog</tt> for logging requires a syslog ID to be configured"
	];
	}
	}

	// check ldap_public sources having global_search enabled
	if (is_array($this->config['ldap_public']) && !is_array($this->config['autocomplete_addressbooks'])) {
	foreach ($this->config['ldap_public'] as $ldap_public) {
	if ($ldap_public['global_search']) {
	$out['replaced'][] = [
	'prop' => 'ldap_public::global_search',
	'replacement' => 'autocomplete_addressbooks'
	];
	break;
	}
	}
	}

	if ($version) {
	$out['defaults'] = [];

	foreach ($this->defaults_changes as $v => $opts) {
	if (version_compare($v, $version, '>')) {
	$out['defaults'] = array_merge($out['defaults'], $opts);
	}
	}

	$out['defaults'] = array_unique($out['defaults']);
	}

	return $out;
	}

	/**
	* Merge the current configuration with the defaults
	* and copy replaced values to the new options.
	*/
	public function merge_config()
	{
	$current = $this->config;
	$this->config = [];

	foreach ($this->replaced_config as $prop => $replacement) {
	if (isset($current[$prop])) {
	if ($prop == 'skin_path') {
	$this->config[$replacement] = preg_replace('#skins/(\w+)/?$#', '\\1', $current[$prop]);
	}
	else if ($prop == 'multiple_identities') {
	$this->config[$replacement] = $current[$prop] ? 2 : 0;
	}
	else {
	$this->config[$replacement] = $current[$prop];
	}
	}

	unset($current[$prop]);
	}

	foreach ($this->obsolete_config as $prop) {
	unset($current[$prop]);
	}

	// add all ldap_public sources having global_search enabled to autocomplete_addressbooks
	if (is_array($current['ldap_public'])) {
	foreach ($current['ldap_public'] as $key => $ldap_public) {
	if ($ldap_public['global_search']) {
	$this->config['autocomplete_addressbooks'][] = $key;
	unset($current['ldap_public'][$key]['global_search']);
	}
	}
	}

	$this->config = array_merge($this->config, $current);

	foreach (array_keys((array) $current['ldap_public']) as $key) {
	$this->config['ldap_public'][$key] = $current['ldap_public'][$key];
	}
	}

	/**
	* Compare the local database schema with the reference schema
	* required for this version of Roundcube
	*
	* @param rcube_db $db Database object
	*
	* @return bool True if the schema is up-to-date, false if not or an error occurred
	*/
	public function db_schema_check($db)
	{
	if (!$this->configured) {
	return false;
	}

	// read reference schema from mysql.initial.sql
	$engine = $db->db_provider;
	$db_schema = $this->db_read_schema(INSTALL_PATH . "SQL/$engine.initial.sql", $schema_version);
	$errors = [];

	// Just check the version
	if ($schema_version) {
	$version = rcmail_utils::db_version();

	if (empty($version)) {
	$errors[] = "Schema version not found";
	}
	else if ($schema_version != $version) {
	$errors[] = "Schema version: {$version} (required: {$schema_version})";
	}

	return !empty($errors) ? $errors : false;
	}

	// check list of tables
	$existing_tables = $db->list_tables();

	foreach ($db_schema as $table => $cols) {
	$table = $this->config['db_prefix'] . $table;

	if (!in_array($table, $existing_tables)) {
	$errors[] = "Missing table '".$table."'";
	}
	else { // compare cols
	$db_cols = $db->list_cols($table);
	$diff = array_diff(array_keys($cols), $db_cols);

	if (!empty($diff)) {
	$errors[] = "Missing columns in table '$table': " . implode(',', $diff);
	}
	}
	}

	return !empty($errors) ? $errors : false;
	}

	/**
	* Utility function to read database schema from an .sql file
	*/
	private function db_read_schema($schemafile, &$version = null)
	{
	$lines = file($schemafile);
	$schema = [];
	$keywords = ['PRIMARY','KEY','INDEX','UNIQUE','CONSTRAINT','REFERENCES','FOREIGN'];
	$table_name = null;

	foreach ($lines as $line) {
	if (preg_match('/^\s*create table ([\S]+)/i', $line, $m)) {
	$table_name = explode('.', $m[1]);
	$table_name = end($table_name);
	$table_name = preg_replace('/[`"\[\]]/', '', $table_name);
	}
	else if (preg_match('/insert into/i', $line) && preg_match('/\'roundcube-version\',\s*\'([0-9]+)\'/', $line, $m)) {
	$version = $m[1];
	}
	else if ($table_name && ($line = trim($line))) {
	if ($line == 'GO' \|\| $line[0] == ')' \|\| $line[strlen($line)-1] == ';') {
	$table_name = null;
	}
	else {
	$items = explode(' ', $line);
	$col = $items[0];
	$col = preg_replace('/[`"\[\]]/', '', $col);

	if (!in_array(strtoupper($col), $keywords)) {
	$type = strtolower($items[1]);
	$type = preg_replace('/[^a-zA-Z0-9()]/', '', $type);

	$schema[$table_name][$col] = $type;
	}
	}
	}
	}

	return $schema;
	}

	/**
	* Try to detect some file's mimetypes to test the correct behavior of fileinfo
	*/
	public function check_mime_detection()
	{
	$errors = [];
	$files = [
	'program/resources/tinymce/video.png' => 'image/png',
	'program/resources/blank.tiff' => 'image/tiff',
	'program/resources/blocked.gif' => 'image/gif',
	];

	foreach ($files as $path => $expected) {
	$mimetype = rcube_mime::file_content_type(INSTALL_PATH . $path, basename($path));
	if ($mimetype != $expected) {
	$errors[] = [$path, $mimetype, $expected];
	}
	}

	return $errors;
	}

	/**
	* Check the correct configuration of the 'mime_types' mapping option
	*/
	public function check_mime_extensions()
	{
	$errors = [];
	$types = [
	'application/zip' => 'zip',
	'text/css' => 'css',
	'application/pdf' => 'pdf',
	'image/gif' => 'gif',
	'image/svg+xml' => 'svg',
	];

	foreach ($types as $mimetype => $expected) {
	$ext = rcube_mime::get_mime_extensions($mimetype);
	if (!in_array($expected, (array) $ext)) {
	$errors[] = [$mimetype, $ext, $expected];
	}
	}

	return $errors;
	}

	/**
	* Getter for the last error message
	*
	* @return string Error message or null if none exists
	*/
	public function get_error()
	{
	return $this->last_error['message'] ?? null;
	}

	/**
	* Return a list with all imap/smtp hosts configured
	*
	* @return array Clean list with imap/smtp hosts
	*/
	public function get_hostlist($prop = 'imap_host')
	{
	$hosts = (array) $this->getprop($prop);
	$out = [];
	$imap_host = '';

	if ($prop == 'smtp_host') {
	// Set the imap host name for the %h macro
	$default_hosts = $this->get_hostlist();
	$imap_host = !empty($default_hosts) ? $default_hosts[0] : '';
	}

	foreach ($hosts as $key => $name) {
	if (!empty($name)) {
	if ($prop == 'smtp_host') {
	// SMTP host array uses `IMAP host => SMTP host` format
	$host = $name;
	}
	else {
	$host = is_numeric($key) ? $name : $key;
	}

	$out[] = rcube_utils::parse_host($host, $imap_host);
	}
	}

	return $out;
	}

	/**
	* Create a HTML dropdown to select a previous version of Roundcube
	*/
	public function versions_select($attrib = [])
	{
	$select = new html_select($attrib);
	$select->add([
	'0.1-stable', '0.1.1',
	'0.2-alpha', '0.2-beta', '0.2-stable',
	'0.3-stable', '0.3.1',
	'0.4-beta', '0.4.2',
	'0.5-beta', '0.5', '0.5.1', '0.5.2', '0.5.3', '0.5.4',
	'0.6-beta', '0.6',
	'0.7-beta', '0.7', '0.7.1', '0.7.2', '0.7.3', '0.7.4',
	'0.8-beta', '0.8-rc', '0.8.0', '0.8.1', '0.8.2', '0.8.3', '0.8.4', '0.8.5', '0.8.6',
	'0.9-beta', '0.9-rc', '0.9-rc2',
	// Note: Do not add newer versions here
	]);

	return $select;
	}

	/**
	* Return a list with available subfolders of the skin directory
	*
	* @return array List of available skins
	*/
	public function list_skins()
	{
	$skins = [];
	$skindir = INSTALL_PATH . 'skins/';

	foreach (glob($skindir . '*') as $path) {
	if (is_dir($path) && is_readable($path)) {
	$skins[] = substr($path, strlen($skindir));
	}
	}

	return $skins;
	}

	/**
	* Return a list with available subfolders of the plugins directory
	* (with their associated description in composer.json)
	*
	* @return array List of available plugins
	*/
	public function list_plugins()
	{
	$plugins = [];
	$plugin_dir = INSTALL_PATH . 'plugins/';
	$enabled = isset($this->config['plugins']) ? (array) $this->config['plugins'] : [];

	foreach (glob($plugin_dir . '*') as $path) {
	if (!is_dir($path)) {
	continue;
	}

	if (is_readable($path . '/composer.json')) {
	$file_json = json_decode(file_get_contents($path . '/composer.json'));
	$plugin_desc = $file_json->description ?: 'N/A';
	}
	else {
	$plugin_desc = 'N/A';
	}

	$name = substr($path, strlen($plugin_dir));
	$plugins[] = [
	'name' => $name,
	'desc' => $plugin_desc,
	'enabled' => in_array($name, $enabled)
	];
	}

	return $plugins;
	}

	/**
	* Display OK status
	*
	* @param string $name Test name
	* @param string $message Confirm message
	*/
	public function pass($name, $message = '')
	{
	echo rcube::Q($name) . ':  <span class="success">OK</span>';
	$this->_showhint($message);
	}

	/**
	* Display an error status and increase failure count
	*
	* @param string $name Test name
	* @param string $message Error message
	* @param string $url URL for details
	* @param bool $optional Do not count this failure
	*/
	public function fail($name, $message = '', $url = '', $optional = false)
	{
	if (!$optional) {
	$this->failures++;
	}

	echo rcube::Q($name) . ':  <span class="fail">NOT OK</span>';
	$this->_showhint($message, $url);
	}

	/**
	* Display an error status for optional settings/features
	*
	* @param string $name Test name
	* @param string $message Error message
	* @param string $url URL for details
	*/
	public function optfail($name, $message = '', $url = '')
	{
	echo rcube::Q($name) . ':  <span class="na">NOT OK</span>';
	$this->_showhint($message, $url);
	}

	/**
	* Display warning status
	*
	* @param string $name Test name
	* @param string $message Warning message
	* @param string $url URL for details
	*/
	public function na($name, $message = '', $url = '')
	{
	echo rcube::Q($name) . ':  <span class="na">NOT AVAILABLE</span>';
	$this->_showhint($message, $url);
	}

	private function _showhint($message, $url = '')
	{
	$hint = rcube::Q($message);

	if ($url) {
	$hint .= ($hint ? '; ' : '') . 'See <a href="' . rcube::Q($url) . '" target="_blank">' . rcube::Q($url) . '</a>';
	}

	if ($hint) {
	echo '<span class="indent">(' . $hint . ')</span>';
	}
	}

	private static function _clean_array($arr)
	{
	$out = [];

	foreach (array_unique($arr) as $k => $val) {
	if (!empty($val)) {
	if (is_numeric($k)) {
	$out[] = $val;
	}
	else {
	$out[$k] = $val;
	}
	}
	}

	return $out;
	}

	private static function _dump_var($var, $name = null)
	{
	// special values
	switch ($name) {
	case 'syslog_facility':
	$list = [
	32 => 'LOG_AUTH', 80 => 'LOG_AUTHPRIV', 72 => ' LOG_CRON',
	24 => 'LOG_DAEMON', 0 => 'LOG_KERN', 128 => 'LOG_LOCAL0',
	136 => 'LOG_LOCAL1', 144 => 'LOG_LOCAL2', 152 => 'LOG_LOCAL3',
	160 => 'LOG_LOCAL4', 168 => 'LOG_LOCAL5', 176 => 'LOG_LOCAL6',
	184 => 'LOG_LOCAL7', 48 => 'LOG_LPR', 16 => 'LOG_MAIL',
	56 => 'LOG_NEWS', 40 => 'LOG_SYSLOG', 8 => 'LOG_USER', 64 => 'LOG_UUCP'
	];

	if (!empty($list[$var])) {
	return $list[$var];
	}

	break;
	}

	if (is_array($var)) {
	if (empty($var)) {
	return '[]';
	}
	// check if all keys are numeric
	$isnum = true;
	foreach (array_keys($var) as $key) {
	if (!is_numeric($key)) {
	$isnum = false;
	break;
	}
	}

	if ($isnum) {
	return '[' . implode(', ', array_map(['rcmail_install', '_dump_var'], $var)) . ']';
	}
	}

	return var_export($var, true);
	}

	/**
	* Initialize the database with the according schema
	*
	* @param rcube_db $db Database connection
	*
	* @return bool True on success, False on error
	*/
	public function init_db($db)
	{
	$engine = $db->db_provider;

	// read schema file from /SQL/*
	$fname = INSTALL_PATH . "SQL/$engine.initial.sql";
	if ($sql = @file_get_contents($fname)) {
	$db->set_option('table_prefix', $this->config['db_prefix']);
	$db->exec_script($sql);
	}
	else {
	$this->fail('DB Schema', "Cannot read the schema file: $fname");
	return false;
	}

	if ($err = $this->get_error()) {
	$this->fail('DB Schema', "Error creating database schema: $err");
	return false;
	}

	return true;
	}

	/**
	* Update database schema
	*
	* @param string $version Version to update from
	*
	* @return boolean True on success, False on error
	*/
	public function update_db($version)
	{
	return rcmail_utils::db_update(INSTALL_PATH . 'SQL', 'roundcube', $version, ['quiet' => true]);
	}

	/**
	* Handler for Roundcube errors
	*/
	public function raise_error($p)
	{
	$this->last_error = $p;
	}
	}

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