Allow disabling Gravatar

Resolves #3600

SoObjects/SOGo/SOGoDefaults.plist

@@ -54,12 +54,14 @@
     SOGoFirstWeekOfYear = "January1";
     SOGoShortDateFormat = "%d-%b-%y";
     SOGoLongDateFormat = "%A, %B %d, %Y";
+    SOGoExternalAvatarsEnabled = YES;
+    SOGoGravatarEnabled = NO;
+    SOGoAlternateAvatar = "none";
 
     SOGoIMAPServer = "localhost";
     SOGoMailDomain = "localhost";
     SOGoSelectedAddressBook = "collected";
     SOGoRefreshViewCheck = "manually";
-    SOGoAlternateAvatar = "none";
     SOGoMailMessageForwarding = "inline";
     SOGoMailReplyPlacement = "below";
     SOGoMailSignaturePlacement = "below";

SoObjects/SOGo/SOGoDomainDefaults.h

@@ -47,6 +47,7 @@
 - (NSString *) imapFolderSeparator;
 - (BOOL) imapAclConformsToIMAPExt;
 - (BOOL) forceExternalLoginWithEmail;
+- (BOOL) externalAvatarsEnabled;
 - (BOOL) sieveScriptsEnabled;
 - (BOOL) forwardEnabled;
 - (int) forwardConstraints;

SoObjects/SOGo/SOGoDomainDefaults.m

@@ -1,6 +1,6 @@
 /* SOGoDomainDefaults.m - this file is part of SOGo
  *
- * Copyright (C) 2009-2015 Inverse inc.
+ * Copyright (C) 2009-2016 Inverse inc.
  *
  * This file is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
@@ -191,6 +191,11 @@
   return [self boolForKey: @"SOGoForceIMAPLoginWithEmail"];
 }
 
+- (BOOL) externalAvatarsEnabled
+{
+  return [self boolForKey: @"SOGoExternalAvatarsEnabled"];
+}
+
 - (BOOL) sieveScriptsEnabled
 {
   return [self boolForKey: @"SOGoSieveScriptsEnabled"];

SoObjects/SOGo/SOGoUserDefaults.h

@@ -126,6 +126,7 @@ extern NSString *SOGoWeekStartFirstFullWeek;
 - (void) setRefreshViewCheck: (NSString *) newValue;
 - (NSString *) refreshViewCheck;
 
+- (BOOL) gravatarEnabled;
 - (void) setAlternateAvatar: (NSString *) newValue;
 - (NSString *) alternateAvatar;
 

SoObjects/SOGo/SOGoUserDefaults.m

@@ -514,6 +514,11 @@ NSString *SOGoWeekStartFirstFullWeek = @"FirstFullWeek";
   return [self stringForKey: @"SOGoRefreshViewCheck"];
 }
 
+- (BOOL) gravatarEnabled
+{
+  return [self boolForKey: @"SOGoGravatarEnabled"];
+}
+
 - (void) setAlternateAvatar: (NSString *) newValue
 {
   [self setObject: newValue forKey: @"SOGoAlternateAvatar"];