(fix) handle emails having an attachment as their content

NEWS

@@ -27,7 +27,7 @@ Bug fixes
  - freebusy on web interface works again in multidomain environments (Zentyal)
  - fix double creation of folders in Outlook when the folder name starts with a digit (Zentyal)
  - avoid crashing Outlook after setting a custom view in a calendar folder (Zentyal)
-
+ - handle emails having an attachment as their content
 
 2.3.2 (2015-09-16)
 ------------------

SoObjects/Mailer/SOGoMailObject.m

@@ -389,8 +389,11 @@ static BOOL debugSoParts       = NO;
       [[[info valueForKey: @"subtype"] lowercaseString] isEqualToString: @"calendar"])
     return info;
 
-  if ([[[info valueForKey: @"type"] lowercaseString] isEqualToString: @"application"] &&
+  // deal with mails that contain only an attachment, for example:
-      [[[info valueForKey: @"subtype"] lowercaseString] isEqualToString: @"pkcs7-mime"])
+  // application/pkcs7-mime
+  // application/pdf
+  // etc.
+  if ([[[info valueForKey: @"type"] lowercaseString] isEqualToString: @"application"])
     return info;
 
   /* 
@@ -1044,6 +1047,14 @@ static BOOL debugSoParts       = NO;
       return obj;
     }
   }
+  // Handles cases where the email is itself an attachment, so its Content-Type
+  // is application/*, image/* etc.
+  else if ([_key isEqualToString: @"asAttachment"] &&
+           (obj = [self lookupImap4BodyPartKey: @"0" inContext:_ctx]) != nil)
+    {
+      [obj setAsAttachment];
+      return obj;
+    }
   
   /* return 404 to stop acquisition */
   return [NSException exceptionWithHTTPStatus:404 /* Not Found */