Webgui: improve box, maintenance and date handling

webgui/lib/db.inc

@@ -8,6 +8,20 @@
 
 */
 
+function db_get_setting($sno, $default=NULL) {
+    // TODO WIP
+    global $pdo;
+    $sql = "SELECT valint, valstr FROM settings WHERE userid=0 AND sno=?";
+    $sth = $pdo->prepare($sql);
+    try {
+        $sth->execute([$sno]);
+    } catch (Exception $e) {
+        return $default;
+    }
+    $row = $sth->fetchOne();
+    return $row;
+}
+
 function db_lock_acquire($table, $key, $userid) {
     global $pdo;
     $token = bin2hex(random_bytes(8));

webgui/lib/gpc.inc

@@ -83,11 +83,44 @@ function gpc_get_bool(&$GPC, $varname, $default = FALSE) {
 }
 
 function gpc_get_date(&$GPC, $varname, $default = NULL) {
-    // TODO improve
-    if (!isset($GPC[$varname]) || $GPC[$varname] == '') {
+    global $g_opt_datefmt;
+    if (!isset($GPC[$varname]) || !is_scalar($GPC[$varname])) {
         return $default;
     }
-    return $GPC[$varname];
+    $value = trim((string)$GPC[$varname]);
+    if ($value === '') {
+        return $default;
+    }
+    foreach (array_keys($g_opt_datefmt) as $format) {
+        if (preg_match_all('/[Ymd]/', $format, $tokens) !== 3) {
+            continue;
+        }
+        $regex = preg_quote($format, '/');
+        $regex = str_replace('d', '(\d{2})', $regex);
+        $regex = str_replace('m', '(\d{2})', $regex);
+        $regex = str_replace('Y', '(\d{4})', $regex);
+        if (!preg_match('/^' . $regex . '$/', $value, $matches)) {
+            continue;
+        }
+        $year = $month = $day = NULL;
+        foreach ($tokens[0] as $i => $token) {
+            switch ($token) {
+                case 'Y':
+                    $year = (int)$matches[$i + 1];
+                    break;
+                case 'm':
+                    $month = (int)$matches[$i + 1];
+                    break;
+                case 'd':
+                    $day = (int)$matches[$i + 1];
+                    break;
+            }
+        }
+        if (checkdate($month, $day, $year)) {
+            return sprintf('%04d-%02d-%02d', $year, $month, $day);
+        }
+    }
+    return $default;
 }
 
 function gpc_get_datetime(&$GPC, $varname, $default = NULL) {