Add JavaScript prompts support to CWVUIDelegate.

ios/web_view/internal/web_view_java_script_dialog_presenter.mm

Index: ios/web_view/internal/web_view_java_script_dialog_presenter.mm
diff --git a/ios/web_view/internal/web_view_java_script_dialog_presenter.mm b/ios/web_view/internal/web_view_java_script_dialog_presenter.mm
new file mode 100644
index 0000000000000000000000000000000000000000..ff87cdaf1a1d3c69a381f57b7bd3726feedd096a
--- /dev/null
+++ b/ios/web_view/internal/web_view_java_script_dialog_presenter.mm
@@ -0,0 +1,117 @@
+// 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/web_view/internal/web_view_java_script_dialog_presenter.h"
+
+#import "ios/web_view/public/cwv_ui_delegate.h"
+#import "net/base/mac/url_conversions.h"
+
+namespace ios_web_view {
+
+WebViewJavaScriptDialogPresenter::WebViewJavaScriptDialogPresenter(
+    CWVWebView* web_view,
+    id<CWVUIDelegate> ui_delegate)
+    : ui_delegate_(ui_delegate), web_view_(web_view) {}
+
+WebViewJavaScriptDialogPresenter::~WebViewJavaScriptDialogPresenter() = default;
+
+void WebViewJavaScriptDialogPresenter::RunJavaScriptDialog(
+    web::WebState* web_state,
+    const GURL& origin_url,
+    web::JavaScriptDialogType dialog_type,
+    NSString* message_text,
+    NSString* default_prompt_text,
+    const web::DialogClosedCallback& callback) {
+  switch (dialog_type) {
+    case web::JAVASCRIPT_DIALOG_TYPE_ALERT:
+      HandleJavaScriptAlert(origin_url, message_text, callback);
+      break;
+    case web::JAVASCRIPT_DIALOG_TYPE_CONFIRM:
+      HandleJavaScriptConfirmDialog(origin_url, message_text, callback);
+      break;
+    case web::JAVASCRIPT_DIALOG_TYPE_PROMPT:
+      HandleJavaScriptTextPrompt(origin_url, message_text, default_prompt_text,
+                                 callback);
+      break;
+  }
+}
+
+void WebViewJavaScriptDialogPresenter::HandleJavaScriptAlert(
+    const GURL& origin_url,
+    NSString* message_text,
+    const web::DialogClosedCallback& callback) {
+  if (![ui_delegate_ respondsToSelector:@selector
+                     (webView:runJavaScriptAlertPanelWithMessage:pageURL
+                                :completionHandler:)]) {
+    callback.Run(NO, nil);
+    return;
+  }
+  web::DialogClosedCallback scoped_callback = callback;
+  [ui_delegate_ webView:web_view_
+      runJavaScriptAlertPanelWithMessage:message_text
+                                 pageURL:net::NSURLWithGURL(origin_url)
+                       completionHandler:^{
+                         if (!scoped_callback.is_null()) {
+                           scoped_callback.Run(YES, nil);
+                         }
+                       }];
+}
+
+void WebViewJavaScriptDialogPresenter::HandleJavaScriptConfirmDialog(
+    const GURL& origin_url,
+    NSString* message_text,
+    const web::DialogClosedCallback& callback) {
+  if (![ui_delegate_ respondsToSelector:@selector
+                     (webView:runJavaScriptConfirmPanelWithMessage:pageURL
+                                :completionHandler:)]) {
+    callback.Run(NO, nil);
+    return;
+  }
+  web::DialogClosedCallback scoped_callback = callback;
+  [ui_delegate_ webView:web_view_
+      runJavaScriptConfirmPanelWithMessage:message_text
+                                   pageURL:net::NSURLWithGURL(origin_url)
+                         completionHandler:^(BOOL is_confirmed) {
+                           if (!scoped_callback.is_null()) {
+                             scoped_callback.Run(is_confirmed, nil);
+                           }
+                         }];
+}
+
+void WebViewJavaScriptDialogPresenter::HandleJavaScriptTextPrompt(
+    const GURL& origin_url,
+    NSString* message_text,
+    NSString* default_prompt_text,
+    const web::DialogClosedCallback& callback) {
+  if (![ui_delegate_ respondsToSelector:@selector
+                     (webView:runJavaScriptTextInputPanelWithPrompt:defaultText
+                                :pageURL:completionHandler:)]) {
+    callback.Run(NO, nil);
+    return;
+  }
+  web::DialogClosedCallback scoped_callback = callback;
+  [ui_delegate_ webView:web_view_
+      runJavaScriptTextInputPanelWithPrompt:message_text
+                                defaultText:default_prompt_text
+                                    pageURL:net::NSURLWithGURL(origin_url)
+                          completionHandler:^(NSString* text_input) {
+                            if (!scoped_callback.is_null()) {
+                              if (text_input == nil) {
+                                scoped_callback.Run(NO, nil);
+                              } else {
+                                scoped_callback.Run(YES, text_input);
+                              }
+                            }
+                          }];
+}
+
+void WebViewJavaScriptDialogPresenter::CancelDialogs(web::WebState* web_state) {
+}
+
+void WebViewJavaScriptDialogPresenter::SetUIDelegate(
+    id<CWVUIDelegate> ui_delegate) {
+  ui_delegate_.reset(ui_delegate);
+}
+
+}  // namespace ios_web_view