Removed old Code. Added simple plugin system

Signed-off-by: michael starke <michael.starke@hicknhack-software.com>

MacPass/MPPlugin.m

@@ -0,0 +1,108 @@
+//
+//  MPPlugin.m
+//  MacPass
+//
+//  Created by Michael Starke on 11/11/15.
+//  Copyright © 2015 HicknHack Software GmbH. All rights reserved.
+//
+
+#import "MPPlugin.h"
+#import "MPPluginManager.h"
+
+NSString *const kMPPluginFileExtension = @"mpplugin";
+
+@implementation MPPlugin
+
++ (instancetype)pluginWithBundleURL:(NSURL *)url pluginManager:(MPPluginManager *)manager {
+  if(![self _validURL:url]) {
+    return nil;
+  }
+  NSBundle *pluginBundle = [NSBundle bundleWithURL:url];
+  if(!pluginBundle) {
+    return nil;
+  }
+  if(![self _validateClass:pluginBundle.principalClass]) {
+    return nil;
+  }
+  return [[pluginBundle.principalClass alloc] initWithPluginManager:manager];
+}
+
+- (instancetype)initWithPluginManager:(MPPluginManager *)manager {
+  self = [super init];
+  return self;
+}
+
+- (NSString *)identifier {
+  NSBundle *bundle = [NSBundle bundleForClass:[self class]];
+  if(bundle && bundle.bundleIdentifier) {
+    return bundle.bundleIdentifier;
+  }
+  return [NSString stringWithFormat:@"unknown.bundle.identifier"];
+}
+
+- (NSString *)name {
+  NSString *name = [self.identifier componentsSeparatedByString:@"."].lastObject;
+  return nil == name ? @"Unkown Plugin" : name;
+}
+
+- (NSString *)version {
+  NSBundle *bundle = [NSBundle bundleForClass:[self class]];
+  NSString *version;
+  if(bundle) {
+    version = bundle.infoDictionary[(NSString *)kCFBundleVersionKey];
+    if(version) {
+      return version;
+    }
+  }
+  return @"unknown.version";
+}
+
++ (BOOL)_validURL:(NSURL *)url {
+  return (NSOrderedSame == [url.pathExtension compare:kMPPluginFileExtension options:NSCaseInsensitiveSearch]);
+}
+
++ (BOOL)_validateClass:(Class)class {
+  return ([class isSubclassOfClass:[MPPlugin class]]);
+}
+
+/* Code by Jedda Wignall<jedda@jedda.me> http://jedda.me/2012/03/verifying-plugin-bundles-using-code-signing/ */
++ (BOOL)_validSignature:(NSURL *)url {
+  if(!url.path) {
+    return NO;
+  }
+  NSTask * task = [[NSTask alloc] init];
+  NSPipe * pipe = [NSPipe pipe];
+  NSArray* args = @[ @"--verify",
+                     /*[NSString stringWithFormat:@"-R=anchor = \"%@\"", [[NSBundle mainBundle] pathForResource:@"BlargsoftCodeCA" ofType:@"cer"]],*/
+                     url.path ];
+  task.launchPath = @"/usr/bin/codesign";
+  task.standardOutput = pipe;
+  task.standardError = pipe;
+  task.arguments = args;
+  [task launch];
+  [task waitUntilExit];
+  
+  if(task.terminationStatus == 0) {
+    return YES;
+  }
+  NSString * taskString = [[NSString alloc] initWithData:pipe.fileHandleForReading.readDataToEndOfFile encoding:NSASCIIStringEncoding];
+  if ([taskString rangeOfString:@"modified"].length > 0 || [taskString rangeOfString:@"a sealed resource is missing or invalid"].length > 0) {
+    // The plugin has been modified or resources removed since being signed. You probably don't want to load this.
+    NSLog(@"Plugin modified - not loaded"); // log a real error here
+  }
+  else if ([taskString rangeOfString:@"failed to satisfy"].length > 0) {
+    // The plugin is missing resources since being signed. Don't load.
+    // throw an error
+    NSLog(@"Plugin not signed by correct CA - not loaded"); // log a real error here
+  }
+  else if ([taskString rangeOfString:@"not signed at all"].length > 0) {
+    // The plugin was not code signed at all. Don't load.
+    NSLog(@"Plugin not signed at all - don't load."); // log a real error here
+  }
+  else {
+    // Some other codesign error
+  }
+  return NO;
+}
+
+@end