Add Digital Asset Links verification for postMessage API

chrome/browser/android/digital_asset_links/digital_asset_links_handler.h

+// Copyright (c) 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.
+
+#ifndef CHROME_BROWSER_ANDROID_DIGITAL_ASSET_LINKS_DIGITAL_ASSET_LINKS_HANDLER_H_
+#define CHROME_BROWSER_ANDROID_DIGITAL_ASSET_LINKS_DIGITAL_ASSET_LINKS_HANDLER_H_
+
+#include "net/url_request/url_fetcher.h"
+#include "net/url_request/url_fetcher_delegate.h"
+#include "net/url_request/url_request_context_getter.h"
+
+namespace base {
+class DictionaryValue;
+}
+
+namespace digital_asset_links {
+
+extern const char kDigitalAssetLinksCheckResponseKeyLinked[];
+
+typedef base::Callback<void(std::unique_ptr<base::DictionaryValue>)>
+    RelationshipCheckResultCallback;
+
+class DigitalAssetLinksHandler : public net::URLFetcherDelegate {
+ public:
+  DigitalAssetLinksHandler(
+      const scoped_refptr<net::URLRequestContextGetter>& request_context);
+  ~DigitalAssetLinksHandler() override;
+
+  bool CheckDigitalAssetLinkRelationship(
+      std::unique_ptr<RelationshipCheckResultCallback> listener,
+      const std::string& web_domain,
+      const std::string& package_name,
+      const std::string& fingerprint,
+      const std::string& relationship);
+
+ private:
+  // net::URLFetcherDelegate:
+  void OnURLFetchComplete(const net::URLFetcher* source) override;
+
+  // URL request context.
+  scoped_refptr<net::URLRequestContextGetter> request_context_;
+
+  std::unique_ptr<net::URLFetcher> url_fetcher_;
+
+  // The callback for receiving a URLFether result. This handler owns this.

[Benoit L, 2017/04/04 18:44:12]

nit: ownership is implied by the unique_ptr.

[Yusuf, 2017/04/05 00:20:42]

Done.

+  std::unique_ptr<RelationshipCheckResultCallback> callback_;

[Benoit L, 2017/04/04 18:44:12]

And actually, since this is a callback, why not taking it by value, so that you
don't have to care about the unique_ptr?

[Yusuf, 2017/04/05 00:20:42]

Done.

+
+  DISALLOW_COPY_AND_ASSIGN(DigitalAssetLinksHandler);
+};
+
+}  // namespace digital_asset_links
+
+#endif  // CHROME_BROWSER_ANDROID_DIGITAL_ASSET_LINKS_DIGITAL_ASSET_LINKS_HANDLER_H_