Add Digital Asset Links verification for postMessage API

components/digital_asset_links/digital_asset_links_handler.h

Index: components/digital_asset_links/digital_asset_links_handler.h
diff --git a/components/digital_asset_links/digital_asset_links_handler.h b/components/digital_asset_links/digital_asset_links_handler.h
new file mode 100644
index 0000000000000000000000000000000000000000..9249e0de2c114db54dedfb4a5f4d0c15cc4ce73a
--- /dev/null
+++ b/components/digital_asset_links/digital_asset_links_handler.h
@@ -0,0 +1,55 @@
+// 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 COMPONENTS_DIGITAL_ASSET_LINKS_DIGITAL_ASSET_LINKS_HANDLER_H_
+#define COMPONENTS_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 {
+
+static const char kDigitalAssetLinksCheckResponseKeyLinked[] = "linked";

[Benoit L, 2017/03/31 15:38:43]

nit: Make this constexpr (and hope for the best) or only declare the constant
here, and define it in the .cc file. Otherwise it will be duplicated at each
inclusion of the file.

[Yusuf, 2017/03/31 22:41:50]

Done.

+
+class AssetLinkListener {

[Benoit L, 2017/03/31 15:38:43]

Since it is a simple Callback for now, what about just a typedef with
base::Callback?

Something like (in DigitalAssetLinkHandler):

typedef base::Callback<void(std::unique_ptr<base::DictionaryValue>)>
RelationshipCheckResultCallback;


?


Independently, you need to pass a unique_ptr<> here, otherwise the dictionary
will be leaked, unless the client knows it has to delete it (and in the android
code the dictionary is indeed leaked).

[Yusuf, 2017/03/31 22:41:50]

Done.

+ public:
+  virtual void OnRelationshipCheckComplete(
+      const base::DictionaryValue* response) = 0;
+  virtual ~AssetLinkListener() {}
+};
+
+class DigitalAssetLinksHandler : public net::URLFetcherDelegate {
+ public:
+  DigitalAssetLinksHandler(
+      const scoped_refptr<net::URLRequestContextGetter>& request_context);
+  ~DigitalAssetLinksHandler() override;
+
+  bool CheckDigitalAssetLinkRelationship(AssetLinkListener* listener,
+                                         std::string web_domain,
+                                         std::string package_name,
+                                         std::string fingerprint,
+                                         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_;
+
+  std::unique_ptr<AssetLinkListener> listener_;
+
+  DISALLOW_COPY_AND_ASSIGN(DigitalAssetLinksHandler);
+};
+
+}  // namespace digital_asset_links
+
+#endif  // COMPONENTS_DIGITAL_ASSET_LINKS_DIGITAL_ASSET_LINKS_HANDLER_H_