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..71cd0e18231a49f927b9c40e8d508d56f35a81bd
--- /dev/null
+++ b/ios/web_view/internal/web_view_java_script_dialog_presenter.mm
@@ -0,0 +1,122 @@
+// 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: {

[Eugene But (OOO till 7-30), 2017/02/27 22:01:05]

Do you still need braces? 

[michaeldo, 2017/02/27 23:39:15]

Nope. Removed.

+      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;
+    }
+    default:

[Eugene But (OOO till 7-30), 2017/02/27 22:01:05]

Please remove default. It is better to get a compiler warning/error if
JavaScriptDialogType is extended with one more entry.

[michaeldo, 2017/02/27 23:39:15]

Done.

+      break;
+  }
+}
+
+void WebViewJavaScriptDialogPresenter::HandleJavaScriptAlert(
+    const GURL& origin_url,
+    NSString* message_text,
+    const web::DialogClosedCallback& callback) {
+  if ([ui_delegate_ respondsToSelector:@selector

[Eugene But (OOO till 7-30), 2017/02/27 22:01:05]

Optional nit: do you want to swap if-else block and have an early return? Same
question for other methods.

[michaeldo, 2017/02/27 23:39:15]

Done.

+                    (webView:runJavaScriptAlertPanelWithMessage:pageURL
+                               :completionHandler:)]) {
+    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);
+                           }
+                         }];
+  } else {
+    callback.Run(NO, nil);
+  }
+}
+
+void WebViewJavaScriptDialogPresenter::HandleJavaScriptConfirmDialog(
+    const GURL& origin_url,
+    NSString* message_text,
+    const web::DialogClosedCallback& callback) {
+  if ([ui_delegate_ respondsToSelector:@selector
+                    (webView:runJavaScriptConfirmPanelWithMessage:pageURL
+                               :completionHandler:)]) {
+    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);
+                             }
+                           }];
+  } else {
+    callback.Run(NO, 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:)]) {
+    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);
+                                }
+                              }
+                            }];
+  } else {
+    callback.Run(NO, nil);
+  }
+}
+
+void WebViewJavaScriptDialogPresenter::CancelDialogs(web::WebState* web_state) {
+}
+
+void WebViewJavaScriptDialogPresenter::SetUIDelegate(
+    id<CWVUIDelegate> ui_delegate) {
+  ui_delegate_.reset(ui_delegate);
+}
+
+}  // namespace ios_web_view