[iOS Clean] Added HTTP authentication dialog support.

ios/clean/chrome/browser/ui/dialogs/http_auth_dialogs/http_auth_dialog_request.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.
+
+#import "ios/clean/chrome/browser/ui/dialogs/http_auth_dialogs/http_auth_dialog_request.h"
+
+#include "base/logging.h"
+#include "components/strings/grit/components_strings.h"
+#include "ios/chrome/grit/ios_strings.h"
+#import "ios/shared/chrome/browser/ui/dialogs/nsurl_protection_space_util.h"
+#include "ui/base/l10n/l10n_util.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+@interface HTTPAuthDialogRequest ()
+
+// The authentication callback provided by WebKit.
+@property(nonatomic, copy) HTTPAuthDialogCallback callback;
+
+// Whether |callback| has been executed.
+@property(nonatomic, assign) BOOL callbackHasBeenExecuted;
+
+// Private initializer used by factory method.
+- (instancetype)initWithWebState:(web::WebState*)webState
+                 protectionSpace:(NSURLProtectionSpace*)protectionSpace
+                      credential:(NSURLCredential*)credential
+                        callback:(HTTPAuthDialogCallback)callback;
+
+@end
+
+@implementation HTTPAuthDialogRequest
+@synthesize webState = _webState;
+@synthesize title = _title;
+@synthesize message = _message;
+@synthesize defaultUserNameText = _defaultUserNameText;
+@synthesize callback = _callback;
+@synthesize callbackHasBeenExecuted = _callbackHasBeenExecuted;
+
+- (instancetype)initWithWebState:(web::WebState*)webState
+                 protectionSpace:(NSURLProtectionSpace*)protectionSpace
+                      credential:(NSURLCredential*)credential
+                        callback:(HTTPAuthDialogCallback)callback {
+  DCHECK(webState);
+  DCHECK(protectionSpace);
+  DCHECK(credential);
+  DCHECK(callback);
+  if ((self = [super init])) {
+    _webState = webState;
+    _title = l10n_util::GetNSStringWithFixup(IDS_LOGIN_DIALOG_TITLE);
+    _message = ios_internal::nsurlprotectionspace_util::MessageForHTTPAuth(
+        protectionSpace);
+    _defaultUserNameText = credential.user ? credential.user : @"";
+    _callback = [callback copy];
+  }
+  return self;
+}
+
+- (void)dealloc {
+  DCHECK(_callbackHasBeenExecuted);
+}
+
+#pragma mark - Public
+
++ (instancetype)stateWithWebState:(web::WebState*)webState
+                  protectionSpace:(NSURLProtectionSpace*)protectionSpace
+                       credential:(NSURLCredential*)credential
+                         callback:(HTTPAuthDialogCallback)callback {
+  return [[self alloc] initWithWebState:webState
+                        protectionSpace:protectionSpace
+                             credential:credential
+                               callback:callback];
+}
+
+- (void)completeAuthenticationWithUsername:(NSString*)username
+                                  password:(NSString*)password {
+  if (self.callbackHasBeenExecuted)
+    return;
+  self.callback(username, password);
+  self.callbackHasBeenExecuted = YES;
+}
+
+@end