[iOS Clean] Added HTTP authentication dialog support.

ios/clean/chrome/browser/ui/dialogs/http_auth_dialogs/http_auth_dialog_mediator.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_mediator.h"
+
+#include "base/logging.h"
+#include "components/strings/grit/components_strings.h"
+#include "ios/chrome/grit/ios_strings.h"
+#import "ios/clean/chrome/browser/ui/commands/http_auth_dialog_commands.h"
+#import "ios/clean/chrome/browser/ui/dialogs/dialog_button_configuration.h"
+#import "ios/clean/chrome/browser/ui/dialogs/dialog_consumer.h"
+#import "ios/clean/chrome/browser/ui/dialogs/dialog_mediator+subclassing.h"
+#import "ios/clean/chrome/browser/ui/dialogs/dialog_text_field_configuration.h"
+#import "ios/clean/chrome/browser/ui/dialogs/http_auth_dialogs/http_auth_dialog_request.h"
+#import "ios/shared/chrome/browser/ui/commands/command_dispatcher.h"
+#include "ui/base/l10n/l10n_util.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+// Dialog configuration tags.
+NSString* const kOKButtonID = @"OKButtonID";
+NSString* const kCancelButtonID = @"CancelButtonID";
+NSString* const kUsernameTextFieldID = @"UsernameTextFieldID";
+NSString* const kPasswordTextFieldID = @"PasswordTextFieldID";
+}
+
+@interface HTTPAuthDialogMediator ()
+
+// The dispatcher for dismissal.
+@property(nonatomic, readonly, strong) id<HTTPAuthDialogDismissalCommands>
+    dismissalDispatcher;
+// The request for this dialog.
+@property(nonatomic, readonly, strong) HTTPAuthDialogRequest* request;
+
+@end
+
+@implementation HTTPAuthDialogMediator
+@synthesize dismissalDispatcher = _dismissalDispatcher;
+@synthesize request = _request;
+
+- (instancetype)initWithRequest:(HTTPAuthDialogRequest*)request
+                     dispatcher:
+                         (id<HTTPAuthDialogDismissalCommands>)dispatcher {
+  DCHECK(request);
+  DCHECK(dispatcher);
+  if ((self = [super init])) {
+    _request = request;
+    _dismissalDispatcher = dispatcher;
+  }
+  return self;
+}
+
+#pragma mark - DialogDismissalCommands
+
+- (void)dismissDialogWithButtonID:(id)buttonID
+                  textFieldValues:
+                      (NSDictionary<id, NSString*>*)textFieldValues {
+  NSString* username = nil;
+  NSString* password = nil;
+  if (buttonID == kOKButtonID) {
+    username = textFieldValues[kUsernameTextFieldID];
+    username = username ? username : @"";
+    password = textFieldValues[kPasswordTextFieldID];
+    password = password ? password : @"";
+  } else if (buttonID == kCancelButtonID) {
+    // Use nil in callbacks for cancelled HTTP auth dialogs.
+  } else {
+    NOTREACHED() << "Received dialog dismissal for unknown button ID.";
+  }
+  [self.request completeAuthenticationWithUsername:username password:password];
+  [self.dismissalDispatcher dismissHTTPAuthDialog];
+}
+
+@end
+
+@implementation HTTPAuthDialogMediator (Subclassing)
+
+- (NSString*)dialogTitle {
+  return self.request.title;
+}
+
+- (NSString*)dialogMessage {
+  return self.request.message;
+}
+
+- (NSArray<DialogButtonConfiguration*>*)buttonConfigs {
+  return @[
+    [DialogButtonConfiguration itemWithText:l10n_util::GetNSString(IDS_OK)
+                                      style:DialogButtonStyle::DEFAULT
+                                 identifier:kOKButtonID],
+    [DialogButtonConfiguration itemWithText:l10n_util::GetNSString(IDS_CANCEL)
+                                      style:DialogButtonStyle::CANCEL
+                                 identifier:kCancelButtonID],
+  ];
+}
+
+- (NSArray<DialogTextFieldConfiguration*>*)textFieldConfigs {
+  NSString* defaultUsername = self.request.defaultUserNameText;
+  NSString* usernamePlaceholder =
+      l10n_util::GetNSString(IDS_IOS_HTTP_LOGIN_DIALOG_USERNAME_PLACEHOLDER);
+  NSString* passwordPlaceholder =
+      l10n_util::GetNSString(IDS_IOS_HTTP_LOGIN_DIALOG_PASSWORD_PLACEHOLDER);
+  return @[
+    [DialogTextFieldConfiguration itemWithDefaultText:defaultUsername
+                                      placeholderText:usernamePlaceholder
+                                               secure:NO
+                                           identifier:kUsernameTextFieldID],
+    [DialogTextFieldConfiguration itemWithDefaultText:nil
+                                      placeholderText:passwordPlaceholder
+                                               secure:YES
+                                           identifier:kPasswordTextFieldID],
+  ];
+}
+
+@end