(feat) added S/MIME file download support

SoObjects/Mailer/SOGoMailBodyPart.m

@@ -1,14 +1,15 @@
 /*
+  Copyright (C) 2005-2017 Inverse inc.
   Copyright (C) 2004-2005 SKYRIX Software AG
 
-  This file is part of OpenGroupware.org.
+  This file is part of SOGo.
 
-  OGo is free software; you can redistribute it and/or modify it under
+  SOGo is free software; you can redistribute it and/or modify it under
   the terms of the GNU Lesser General Public License as published by the
   Free Software Foundation; either version 2, or (at your option) any
   later version.
 
-  OGo is distributed in the hope that it will be useful, but WITHOUT ANY
+  SOGo is distributed in the hope that it will be useful, but WITHOUT ANY
   WARRANTY; without even the implied warranty of MERCHANTABILITY or
   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
   License for more details.
@@ -32,12 +33,15 @@
 #import <NGExtensions/NGBase64Coding.h>
 #import <NGExtensions/NGQuotedPrintableCoding.h>
 #import <NGImap4/NGImap4Connection.h>
+#import <NGMail/NGMimeMessage.h>
+#import <NGMime/NGMimeMultipartBody.h>
 
 #import <SoObjects/SOGo/NSDictionary+Utilities.h>
 
+#import "NSData+SMIME.h"
 #import "NSDictionary+Mail.h"
 #import "SOGoMailObject.h"
-
+#import "SOGoMailAccount.h"
 #import "SOGoMailBodyPart.h"
 
 @implementation SOGoMailBodyPart
@@ -250,10 +254,9 @@ static BOOL debugOn = NO;
   NSString *enc;
   NSData *data;
   
-  data = [[self imap4Connection] fetchContentOfBodyPart:
-				   [self bodyPartIdentifier]
-				 atURL:[self imap4URL]
-                                 withPeek: withPeek];
+  data = [[self imap4Connection] fetchContentOfBodyPart: [self bodyPartIdentifier]
+                                                  atURL: [self imap4URL]
+                                               withPeek: withPeek];
   if (data == nil) return nil;
 
   /* check for content encodings */
@@ -289,6 +292,26 @@ static BOOL debugOn = NO;
 
 - (NSData *) fetchBLOB
 {
+  if ([[self container] isEncrypted])
+    {
+      NSData *certificate;
+
+      certificate = [[self mailAccountFolder] certificate];
+
+      // If we got a user certificate, let's use it. Otherwise we fallback
+      // to the current BLOB fetching code.
+      if (certificate)
+        {
+          NGMimeMessage *m;
+          id part;
+
+          m = [[container content] messageFromEncryptedDataAndCertificate: certificate];
+          part = [[[m body] parts] objectAtIndex: ([[self nameInContainer] intValue]-1)];
+
+          return [part body];
+        }
+    }
+
   return [self fetchBLOBWithPeek: NO];
 }