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<?php
/* vim: set expandtab sw=4 ts=4 sts=4: */
/**
 * Functions for event management.
 *
 * @package PhpMyAdmin
 */
use PMA\libraries\Response;

if (! defined('PHPMYADMIN')) {
    exit;
}

/**
 * Sets required globals
 *
 * @return void
 */
function PMA_EVN_setGlobals()
{
    global $event_status, $event_type, $event_interval;

    $event_status        = array(
                               'query'   => array('ENABLE',
                                                  'DISABLE',
                                                  'DISABLE ON SLAVE'),
                               'display' => array('ENABLED',
                                                  'DISABLED',
                                                  'SLAVESIDE_DISABLED')
                           );
    $event_type          = array('RECURRING',
                                 'ONE TIME');
    $event_interval      = array('YEAR',
                                 'QUARTER',
                                 'MONTH',
                                 'DAY',
                                 'HOUR',
                                 'MINUTE',
                                 'WEEK',
                                 'SECOND',
                                 'YEAR_MONTH',
                                 'DAY_HOUR',
                                 'DAY_MINUTE',
                                 'DAY_SECOND',
                                 'HOUR_MINUTE',
                                 'HOUR_SECOND',
                                 'MINUTE_SECOND');
}

/**
 * Main function for the events functionality
 *
 * @return void
 */
function PMA_EVN_main()
{
    global $db;

    PMA_EVN_setGlobals();
    /**
     * Process all requests
     */
    PMA_EVN_handleEditor();
    PMA_EVN_handleExport();
    /**
     * Display a list of available events
     */
    $items = $GLOBALS['dbi']->getEvents($db);
    echo PMA_RTE_getList('event', $items);
    /**
     * Display a link for adding a new event, if
     * the user has the privileges and a link to
     * toggle the state of the event scheduler.
     */
    echo PMA_EVN_getFooterLinks();
} // end PMA_EVN_main()

/**
 * Handles editor requests for adding or editing an item
 *
 * @return void
 */
function PMA_EVN_handleEditor()
{
    global $_REQUEST, $_POST, $errors, $db;

    if (! empty($_REQUEST['editor_process_add'])
        || ! empty($_REQUEST['editor_process_edit'])
    ) {
        $sql_query = '';

        $item_query = PMA_EVN_getQueryFromRequest();

        if (! count($errors)) { // set by PMA_RTN_getQueryFromRequest()
            // Execute the created query
            if (! empty($_REQUEST['editor_process_edit'])) {
                // Backup the old trigger, in case something goes wrong
                $create_item = $GLOBALS['dbi']->getDefinition(
                    $db,
                    'EVENT',
                    $_REQUEST['item_original_name']
                );
                $drop_item = "DROP EVENT "
                    . PMA\libraries\Util::backquote($_REQUEST['item_original_name'])
                    . ";\n";
                $result = $GLOBALS['dbi']->tryQuery($drop_item);
                if (! $result) {
                    $errors[] = sprintf(
                        __('The following query has failed: "%s"'),
                        htmlspecialchars($drop_item)
                    )
                    . '<br />'
                    . __('MySQL said: ') . $GLOBALS['dbi']->getError(null);
                } else {
                    $result = $GLOBALS['dbi']->tryQuery($item_query);
                    if (! $result) {
                        $errors[] = sprintf(
                            __('The following query has failed: "%s"'),
                            htmlspecialchars($item_query)
                        )
                        . '<br />'
                        . __('MySQL said: ') . $GLOBALS['dbi']->getError(null);
                        // We dropped the old item, but were unable to create
                        // the new one. Try to restore the backup query
                        $result = $GLOBALS['dbi']->tryQuery($create_item);
                        $errors = checkResult(
                            $result,
                            __(
                                'Sorry, we failed to restore the dropped event.'
                            ),
                            $create_item,
                            $errors
                        );
                    } else {
                        $message = PMA\libraries\Message::success(
                            __('Event %1$s has been modified.')
                        );
                        $message->addParam(
                            PMA\libraries\Util::backquote($_REQUEST['item_name'])
                        );
                        $sql_query = $drop_item . $item_query;
                    }
                }
            } else {
                // 'Add a new item' mode
                $result = $GLOBALS['dbi']->tryQuery($item_query);
                if (! $result) {
                    $errors[] = sprintf(
                        __('The following query has failed: "%s"'),
                        htmlspecialchars($item_query)
                    )
                    . '<br /><br />'
                    . __('MySQL said: ') . $GLOBALS['dbi']->getError(null);
                } else {
                    $message = PMA\libraries\Message::success(
                        __('Event %1$s has been created.')
                    );
                    $message->addParam(
                        PMA\libraries\Util::backquote($_REQUEST['item_name'])
                    );
                    $sql_query = $item_query;
                }
            }
        }

        if (count($errors)) {
            $message = PMA\libraries\Message::error(
                '<b>'
                . __(
                    'One or more errors have occurred while processing your request:'
                )
                . '</b>'
            );
            $message->addString('<ul>');
            foreach ($errors as $string) {
                $message->addString('<li>' . $string . '</li>');
            }
            $message->addString('</ul>');
        }

        $output = PMA\libraries\Util::getMessage($message, $sql_query);
        if ($GLOBALS['is_ajax_request']) {
            $response = PMA\libraries\Response::getInstance();
            if ($message->isSuccess()) {
                $events = $GLOBALS['dbi']->getEvents($db, $_REQUEST['item_name']);
                $event = $events[0];
                $response->addJSON(
                    'name',
                    htmlspecialchars(
                        mb_strtoupper($_REQUEST['item_name'])
                    )
                );
                $response->addJSON('new_row', PMA_EVN_getRowForList($event));
                $response->addJSON('insert', ! empty($event));
                $response->addJSON('message', $output);
            } else {
                $response->setRequestStatus(false);
                $response->addJSON('message', $message);
            }
            exit;
        }
    }
    /**
     * Display a form used to add/edit a trigger, if necessary
     */
    if (count($errors)
        || (empty($_REQUEST['editor_process_add'])
        && empty($_REQUEST['editor_process_edit'])
        && (! empty($_REQUEST['add_item'])
        || ! empty($_REQUEST['edit_item'])
        || ! empty($_REQUEST['item_changetype'])))
    ) { // FIXME: this must be simpler than that
        $operation = '';
        if (! empty($_REQUEST['item_changetype'])) {
            $operation = 'change';
        }
        // Get the data for the form (if any)
        if (! empty($_REQUEST['add_item'])) {
            $title = PMA_RTE_getWord('add');
            $item = PMA_EVN_getDataFromRequest();
            $mode = 'add';
        } else if (! empty($_REQUEST['edit_item'])) {
            $title = __("Edit event");
            if (! empty($_REQUEST['item_name'])
                && empty($_REQUEST['editor_process_edit'])
                && empty($_REQUEST['item_changetype'])
            ) {
                $item = PMA_EVN_getDataFromName($_REQUEST['item_name']);
                if ($item !== false) {
                    $item['item_original_name'] = $item['item_name'];
                }
            } else {
                $item = PMA_EVN_getDataFromRequest();
            }
            $mode = 'edit';
        }
        PMA_RTE_sendEditor('EVN', $mode, $item, $title, $db, $operation);
    }
} // end PMA_EVN_handleEditor()

/**
 * This function will generate the values that are required to for the editor
 *
 * @return array    Data necessary to create the editor.
 */
function PMA_EVN_getDataFromRequest()
{
    $retval = array();
    $indices = array('item_name',
                     'item_original_name',
                     'item_status',
                     'item_execute_at',
                     'item_interval_value',
                     'item_interval_field',
                     'item_starts',
                     'item_ends',
                     'item_definition',
                     'item_preserve',
                     'item_comment',
                     'item_definer');
    foreach ($indices as $index) {
        $retval[$index] = isset($_REQUEST[$index]) ? $_REQUEST[$index] : '';
    }
    $retval['item_type']        = 'ONE TIME';
    $retval['item_type_toggle'] = 'RECURRING';
    if (isset($_REQUEST['item_type']) && $_REQUEST['item_type'] == 'RECURRING') {
        $retval['item_type']        = 'RECURRING';
        $retval['item_type_toggle'] = 'ONE TIME';
    }
    return $retval;
} // end PMA_EVN_getDataFromRequest()

/**
 * This function will generate the values that are required to complete
 * the "Edit event" form given the name of a event.
 *
 * @param string $name The name of the event.
 *
 * @return array Data necessary to create the editor.
 */
function PMA_EVN_getDataFromName($name)
{
    global $db;

    $retval = array();
    $columns = "`EVENT_NAME`, `STATUS`, `EVENT_TYPE`, `EXECUTE_AT`, "
             . "`INTERVAL_VALUE`, `INTERVAL_FIELD`, `STARTS`, `ENDS`, "
             . "`EVENT_DEFINITION`, `ON_COMPLETION`, `DEFINER`, `EVENT_COMMENT`";
    $where   = "EVENT_SCHEMA " . PMA\libraries\Util::getCollateForIS() . "="
             . "'" . $GLOBALS['dbi']->escapeString($db) . "' "
             . "AND EVENT_NAME='" . $GLOBALS['dbi']->escapeString($name) . "'";
    $query   = "SELECT $columns FROM `INFORMATION_SCHEMA`.`EVENTS` WHERE $where;";
    $item    = $GLOBALS['dbi']->fetchSingleRow($query);
    if (! $item) {
        return false;
    }
    $retval['item_name']   = $item['EVENT_NAME'];
    $retval['item_status'] = $item['STATUS'];
    $retval['item_type']   = $item['EVENT_TYPE'];
    if ($retval['item_type'] == 'RECURRING') {
        $retval['item_type_toggle'] = 'ONE TIME';
    } else {
        $retval['item_type_toggle'] = 'RECURRING';
    }
    $retval['item_execute_at']     = $item['EXECUTE_AT'];
    $retval['item_interval_value'] = $item['INTERVAL_VALUE'];
    $retval['item_interval_field'] = $item['INTERVAL_FIELD'];
    $retval['item_starts']         = $item['STARTS'];
    $retval['item_ends']           = $item['ENDS'];
    $retval['item_preserve']       = '';
    if ($item['ON_COMPLETION'] == 'PRESERVE') {
        $retval['item_preserve']   = " checked='checked'";
    }
    $retval['item_definition'] = $item['EVENT_DEFINITION'];
    $retval['item_definer']    = $item['DEFINER'];
    $retval['item_comment']    = $item['EVENT_COMMENT'];

    return $retval;
} // end PMA_EVN_getDataFromName()

/**
 * Displays a form used to add/edit an event
 *
 * @param string $mode      If the editor will be used to edit an event
 *                              or add a new one: 'edit' or 'add'.
 * @param string $operation If the editor was previously invoked with
 *                              JS turned off, this will hold the name of
 *                              the current operation
 * @param array  $item      Data for the event returned by
 *                              PMA_EVN_getDataFromRequest() or
 *                              PMA_EVN_getDataFromName()
 *
 * @return string   HTML code for the editor.
 */
function PMA_EVN_getEditorForm($mode, $operation, $item)
{
    global $db, $table, $event_status, $event_type, $event_interval;

    $modeToUpper = mb_strtoupper($mode);

    // Escape special characters
    $need_escape = array(
                       'item_original_name',
                       'item_name',
                       'item_type',
                       'item_execute_at',
                       'item_interval_value',
                       'item_starts',
                       'item_ends',
                       'item_definition',
                       'item_definer',
                       'item_comment'
                   );
    foreach ($need_escape as $index) {
        $item[$index] = htmlentities($item[$index], ENT_QUOTES);
    }
    $original_data = '';
    if ($mode == 'edit') {
        $original_data = "<input name='item_original_name' "
                       . "type='hidden' value='{$item['item_original_name']}'/>\n";
    }
    // Handle some logic first
    if ($operation == 'change') {
        if ($item['item_type'] == 'RECURRING') {
            $item['item_type']         = 'ONE TIME';
            $item['item_type_toggle']  = 'RECURRING';
        } else {
            $item['item_type']         = 'RECURRING';
            $item['item_type_toggle']  = 'ONE TIME';
        }
    }
    if ($item['item_type'] == 'ONE TIME') {
        $isrecurring_class = ' hide';
        $isonetime_class   = '';
    } else {
        $isrecurring_class = '';
        $isonetime_class   = ' hide';
    }
    // Create the output
    $retval  = "";
    $retval .= "<!-- START " . $modeToUpper . " EVENT FORM -->\n\n";
    $retval .= "<form class='rte_form' action='db_events.php' method='post'>\n";
    $retval .= "<input name='{$mode}_item' type='hidden' value='1' />\n";
    $retval .= $original_data;
    $retval .= PMA_URL_getHiddenInputs($db, $table) . "\n";
    $retval .= "<fieldset>\n";
    $retval .= "<legend>" . __('Details') . "</legend>\n";
    $retval .= "<table class='rte_table' style='width: 100%'>\n";
    $retval .= "<tr>\n";
    $retval .= "    <td style='width: 20%;'>" . __('Event name') . "</td>\n";
    $retval .= "    <td><input type='text' name='item_name' \n";
    $retval .= "               value='{$item['item_name']}'\n";
    $retval .= "               maxlength='64' /></td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr>\n";
    $retval .= "    <td>" . __('Status') . "</td>\n";
    $retval .= "    <td>\n";
    $retval .= "        <select name='item_status'>\n";
    foreach ($event_status['display'] as $key => $value) {
        $selected = "";
        if (! empty($item['item_status']) && $item['item_status'] == $value) {
            $selected = " selected='selected'";
        }
        $retval .= "<option$selected>$value</option>";
    }
    $retval .= "        </select>\n";
    $retval .= "    </td>\n";
    $retval .= "</tr>\n";

    $retval .= "<tr>\n";
    $retval .= "    <td>" . __('Event type') . "</td>\n";
    $retval .= "    <td>\n";
    if ($GLOBALS['is_ajax_request']) {
        $retval .= "        <select name='item_type'>";
        foreach ($event_type as $key => $value) {
            $selected = "";
            if (! empty($item['item_type']) && $item['item_type'] == $value) {
                $selected = " selected='selected'";
            }
            $retval .= "<option$selected>$value</option>";
        }
        $retval .= "        </select>\n";
    } else {
        $retval .= "        <input name='item_type' type='hidden' \n";
        $retval .= "               value='{$item['item_type']}' />\n";
        $retval .= "        <div class='floatleft' style='width: 49%; "
            . "text-align: center; font-weight: bold;'>\n";
        $retval .= "            {$item['item_type']}\n";
        $retval .= "        </div>\n";
        $retval .= "        <input style='width: 49%;' type='submit'\n";
        $retval .= "               name='item_changetype'\n";
        $retval .= "               value='";
        $retval .= sprintf(__('Change to %s'), $item['item_type_toggle']);
        $retval .= "' />\n";
    }
    $retval .= "    </td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr class='onetime_event_row $isonetime_class'>\n";
    $retval .= "    <td>" . __('Execute at') . "</td>\n";
    $retval .= "    <td class='nowrap'>\n";
    $retval .= "        <input type='text' name='item_execute_at'\n";
    $retval .= "               value='{$item['item_execute_at']}'\n";
    $retval .= "               class='datetimefield' />\n";
    $retval .= "    </td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr class='recurring_event_row $isrecurring_class'>\n";
    $retval .= "    <td>" . __('Execute every') . "</td>\n";
    $retval .= "    <td>\n";
    $retval .= "        <input style='width: 49%;' type='text'\n";
    $retval .= "               name='item_interval_value'\n";
    $retval .= "               value='{$item['item_interval_value']}' />\n";
    $retval .= "        <select style='width: 49%;' name='item_interval_field'>";
    foreach ($event_interval as $key => $value) {
        $selected = "";
        if (! empty($item['item_interval_field'])
            && $item['item_interval_field'] == $value
        ) {
            $selected = " selected='selected'";
        }
        $retval .= "<option$selected>$value</option>";
    }
    $retval .= "        </select>\n";
    $retval .= "    </td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr class='recurring_event_row$isrecurring_class'>\n";
    $retval .= "    <td>" . _pgettext('Start of recurring event', 'Start');
    $retval .= "    </td>\n";
    $retval .= "    <td class='nowrap'>\n";
    $retval .= "        <input type='text'\n name='item_starts'\n";
    $retval .= "               value='{$item['item_starts']}'\n";
    $retval .= "               class='datetimefield' />\n";
    $retval .= "    </td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr class='recurring_event_row$isrecurring_class'>\n";
    $retval .= "    <td>" . _pgettext('End of recurring event', 'End') . "</td>\n";
    $retval .= "    <td class='nowrap'>\n";
    $retval .= "        <input type='text' name='item_ends'\n";
    $retval .= "               value='{$item['item_ends']}'\n";
    $retval .= "               class='datetimefield' />\n";
    $retval .= "    </td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr>\n";
    $retval .= "    <td>" . __('Definition') . "</td>\n";
    $retval .= "    <td><textarea name='item_definition' rows='15' cols='40'>";
    $retval .= $item['item_definition'];
    $retval .= "</textarea></td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr>\n";
    $retval .= "    <td>" . __('On completion preserve') . "</td>\n";
    $retval .= "    <td><input type='checkbox'\n";
    $retval .= "             name='item_preserve'{$item['item_preserve']} /></td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr>\n";
    $retval .= "    <td>" . __('Definer') . "</td>\n";
    $retval .= "    <td><input type='text' name='item_definer'\n";
    $retval .= "               value='{$item['item_definer']}' /></td>\n";
    $retval .= "</tr>\n";
    $retval .= "<tr>\n";
    $retval .= "    <td>" . __('Comment') . "</td>\n";
    $retval .= "    <td><input type='text' name='item_comment' maxlength='64'\n";
    $retval .= "               value='{$item['item_comment']}' /></td>\n";
    $retval .= "</tr>\n";
    $retval .= "</table>\n";
    $retval .= "</fieldset>\n";
    if ($GLOBALS['is_ajax_request']) {
        $retval .= "<input type='hidden' name='editor_process_{$mode}'\n";
        $retval .= "       value='true' />\n";
        $retval .= "<input type='hidden' name='ajax_request' value='true' />\n";
    } else {
        $retval .= "<fieldset class='tblFooters'>\n";
        $retval .= "    <input type='submit' name='editor_process_{$mode}'\n";
        $retval .= "           value='" . __('Go') . "' />\n";
        $retval .= "</fieldset>\n";
    }
    $retval .= "</form>\n\n";
    $retval .= "<!-- END " . $modeToUpper . " EVENT FORM -->\n\n";

    return $retval;
} // end PMA_EVN_getEditorForm()

/**
 * Composes the query necessary to create an event from an HTTP request.
 *
 * @return string  The CREATE EVENT query.
 */
function PMA_EVN_getQueryFromRequest()
{
    global $_REQUEST, $errors, $event_status, $event_type, $event_interval;

    $query = 'CREATE ';
    if (! empty($_REQUEST['item_definer'])) {
        if (mb_strpos($_REQUEST['item_definer'], '@') !== false
        ) {
            $arr = explode('@', $_REQUEST['item_definer']);
            $query .= 'DEFINER=' . PMA\libraries\Util::backquote($arr[0]);
            $query .= '@' . PMA\libraries\Util::backquote($arr[1]) . ' ';
        } else {
            $errors[] = __('The definer must be in the "username@hostname" format!');
        }
    }
    $query .= 'EVENT ';
    if (! empty($_REQUEST['item_name'])) {
        $query .= PMA\libraries\Util::backquote($_REQUEST['item_name']) . ' ';
    } else {
        $errors[] = __('You must provide an event name!');
    }
    $query .= 'ON SCHEDULE ';
    if (! empty($_REQUEST['item_type'])
        && in_array($_REQUEST['item_type'], $event_type)
    ) {
        if ($_REQUEST['item_type'] == 'RECURRING') {
            if (! empty($_REQUEST['item_interval_value'])
                && !empty($_REQUEST['item_interval_field'])
                && in_array($_REQUEST['item_interval_field'], $event_interval)
            ) {
                $query .= 'EVERY ' . intval($_REQUEST['item_interval_value']) . ' ';
                $query .= $_REQUEST['item_interval_field'] . ' ';
            } else {
                $errors[]
                    = __('You must provide a valid interval value for the event.');
            }
            if (! empty($_REQUEST['item_starts'])) {
                $query .= "STARTS '"
                    . $GLOBALS['dbi']->escapeString($_REQUEST['item_starts'])
                    . "' ";
            }
            if (! empty($_REQUEST['item_ends'])) {
                $query .= "ENDS '"
                    . $GLOBALS['dbi']->escapeString($_REQUEST['item_ends'])
                    . "' ";
            }
        } else {
            if (! empty($_REQUEST['item_execute_at'])) {
                $query .= "AT '"
                    . $GLOBALS['dbi']->escapeString($_REQUEST['item_execute_at'])
                    . "' ";
            } else {
                $errors[]
                    = __('You must provide a valid execution time for the event.');
            }
        }
    } else {
        $errors[] = __('You must provide a valid type for the event.');
    }
    $query .= 'ON COMPLETION ';
    if (empty($_REQUEST['item_preserve'])) {
        $query .= 'NOT ';
    }
    $query .= 'PRESERVE ';
    if (! empty($_REQUEST['item_status'])) {
        foreach ($event_status['display'] as $key => $value) {
            if ($value == $_REQUEST['item_status']) {
                $query .= $event_status['query'][$key] . ' ';
                break;
            }
        }
    }
    if (! empty($_REQUEST['item_comment'])) {
        $query .= "COMMENT '" . $GLOBALS['dbi']->escapeString(
            $_REQUEST['item_comment']
        ) . "' ";
    }
    $query .= 'DO ';
    if (! empty($_REQUEST['item_definition'])) {
        $query .= $_REQUEST['item_definition'];
    } else {
        $errors[] = __('You must provide an event definition.');
    }

    return $query;
} // end PMA_EVN_getQueryFromRequest()