[iOS Clean] Added JavaScript dialog support.

ios/clean/chrome/browser/ui/dialogs/java_script_dialogs/java_script_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/java_script_dialogs/java_script_dialog_request.h"
+
+#import "base/strings/sys_string_conversions.h"
+#include "components/strings/grit/components_strings.h"
+#import "ios/web/public/web_state/web_state.h"
+#include "ui/base/l10n/l10n_util.h"
+#include "url/gurl.h"
+
+#if !defined(__has_feature) || !__has_feature(objc_arc)
+#error "This file requires ARC support."
+#endif
+
+namespace {
+// The hostname to use for JavaScript dialogs when the origin URL is invalid.
+const char kAboutNullHostname[] = "about:null";
+}  // namespace
+
+@interface JavaScriptDialogRequest () {
+  // The callback passed upon initialization.
+  web::DialogClosedCallback _callback;
+  // Whether |_callback| has been run;
+  BOOL _callbackHasBeenExecuted;
+}
+
+// Private initializer used by factory method.
+- (instancetype)initWithWebState:(web::WebState*)webState
+                            type:(web::JavaScriptDialogType)type
+                       originURL:(const GURL&)originURL
+                         message:(NSString*)message
+               defaultPromptText:(NSString*)defaultPromptText
+                        callback:(const web::DialogClosedCallback&)callback;
+
+// Returns the title to use when displaying dialogs from |originURL|.
++ (NSString*)titleForDialogFromOrigin:(const GURL&)originURL;
+
+@end
+
+@implementation JavaScriptDialogRequest
+
+@synthesize webState = _webState;
+@synthesize type = _type;
+@synthesize title = _title;
+@synthesize message = _message;
+@synthesize defaultPromptText = _defaultPromptText;
+
+- (instancetype)initWithWebState:(web::WebState*)webState
+                            type:(web::JavaScriptDialogType)type
+                       originURL:(const GURL&)originURL
+                         message:(NSString*)message
+               defaultPromptText:(NSString*)defaultPromptText
+                        callback:(const web::DialogClosedCallback&)callback {
+  if ((self = [super init])) {
+    _webState = webState;
+    _type = type;
+    _title = [[self class] titleForDialogFromOrigin:originURL];
+    _message = message;
+    _defaultPromptText = defaultPromptText;
+    _callback = callback;
+  }
+  return self;
+}
+
+- (void)dealloc {
+  DCHECK(_callbackHasBeenExecuted);
+}
+
+#pragma mark - Public
+
++ (instancetype)stateWithWebState:(web::WebState*)webState
+                             type:(web::JavaScriptDialogType)type
+                        originURL:(const GURL&)originURL
+                          message:(NSString*)message
+                defaultPromptText:(NSString*)defaultPromptText
+                         callback:(const web::DialogClosedCallback&)callback {
+  return [[[self class] alloc] initWithWebState:webState
+                                           type:type
+                                      originURL:originURL
+                                        message:message
+                              defaultPromptText:defaultPromptText
+                                       callback:callback];
+}
+
+- (void)finishRequestWithSuccess:(BOOL)success userInput:(NSString*)userInput {
+  if (_callbackHasBeenExecuted)
+    return;
+  _callback.Run(success, userInput);
+  _callbackHasBeenExecuted = YES;
+}
+
+#pragma mark -
+
++ (NSString*)titleForDialogFromOrigin:(const GURL&)originURL {
+  NSString* hostname = originURL.is_valid()
+                           ? base::SysUTF8ToNSString(originURL.host())
+                           : base::SysUTF8ToNSString(kAboutNullHostname);
+  return l10n_util::GetNSStringF(IDS_JAVASCRIPT_MESSAGEBOX_TITLE,
+                                 base::SysNSStringToUTF16(hostname));
+}
+
+@end