feat(preferences): allow hiding of vacation the vacation period

This is controllable using the new SOGoVacationPeriodEnabled
domain defaults variable.

SoObjects/SOGo/SOGoDomainDefaults.h

@@ -52,6 +52,7 @@
 - (int) forwardConstraints;
 - (NSArray *) forwardConstraintsDomains;
 - (BOOL) vacationEnabled;
+- (BOOL) vacationPeriodEnabled;
 - (NSString *) vacationDefaultSubject;
 - (NSString *) vacationHeaderTemplateFile;
 - (NSString *) vacationFooterTemplateFile;

SoObjects/SOGo/SOGoDomainDefaults.m

@@ -220,6 +220,18 @@
   return [self boolForKey: @"SOGoVacationEnabled"];
 }
 
+- (BOOL) vacationPeriodEnabled
+{
+  id o;
+
+  o = [self stringForKey: @"SOGoVacationPeriodEnabled"];
+
+  if (o)
+    return [o boolValue];
+
+  return YES;
+}
+
 - (NSString *) vacationDefaultSubject
 {
   return [self stringForKey: @"SOGoVacationDefaultSubject"];

SoObjects/SOGo/SOGoSieveManager.m

@@ -927,7 +927,9 @@ static NSString *sieveScriptName = @"sogo";
         }
 
       // Start date of auto-reply
-      if ([[values objectForKey: @"startDateEnabled"] boolValue] && dateCapability)
+      if ([dd vacationPeriodEnabled] &&
+          [[values objectForKey: @"startDateEnabled"] boolValue] &&
+          dateCapability)
         {
           [req addObjectUniquely: @"date"];
           [req addObjectUniquely: @"relational"];
@@ -938,7 +940,9 @@ static NSString *sieveScriptName = @"sogo";
         }
 
       // End date of auto-reply
-      if ([[values objectForKey: @"endDateEnabled"] boolValue] && dateCapability)
+      if ([dd vacationPeriodEnabled] &&
+          [[values objectForKey: @"endDateEnabled"] boolValue] &&
+          dateCapability)
         {
           [req addObjectUniquely: @"date"];
           [req addObjectUniquely: @"relational"];