[CRD iOS] Implementing save to keychain and user defaults for login info. Refactor remoting service.

remoting/client/ios/domain/user_info.mm

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
 #endif
 
 #import "remoting/client/ios/domain/user_info.h"
 
 @implementation UserInfo
 
 @synthesize userId = _userId;
 @synthesize userFullName = _userFullName;
 @synthesize userEmail = _userEmail;
+@synthesize refreshToken = _refreshToken;
 
 // Parse jsonData into Host list.
 + (UserInfo*)parseListFromJSON:(NSMutableData*)data {
   NSError* error;
 
   NSDictionary* json = [NSJSONSerialization JSONObjectWithData:data
                                                        options:kNilOptions
                                                          error:&error];
 
   UserInfo* user = [[UserInfo alloc] init];
   user.userId = [json objectForKey:@"userId"];
   user.userFullName = [json objectForKey:@"userFullName"];
   user.userEmail = [json objectForKey:@"userEmail"];
+  user.refreshToken = [json objectForKey:@"refreshToken"];
 
   return user;
 }
 
+- (BOOL)isAuthenticated {
+  if (_userEmail && _userEmail.length > 0 && _refreshToken &&
+      _refreshToken.length > 0) {
+    return YES;
+  }
+  return NO;
+}
+
 - (NSComparisonResult)compare:(UserInfo*)user {
   return [self.userId compare:user.userId];
 }
 
+- (NSString*)description {
+  return [NSString stringWithFormat:@"UserInfo: userEmail=%@ refreshToken=%@",
+                                    _userEmail, _refreshToken];
+}
+
 @end