Mandoline: Support about:blank URL.

mojo/runner/about_fetcher.h

+// Copyright 2015 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 MOJO_RUNNER_ABOUT_FETCHER_H_
+#define MOJO_RUNNER_ABOUT_FETCHER_H_
+
+#include "mojo/shell/fetcher.h"
+
+#include "base/macros.h"
+#include "mojo/services/network/public/interfaces/url_loader.mojom.h"
+#include "url/gurl.h"
+
+namespace mojo {
+namespace runner {
+
+// Implements Fetcher for about: URLs.
+// Instances of this class must be allocated on the heap. They manage their own
+// lifespan.
+class AboutFetcher : public shell::Fetcher {

[sky, 2015/08/04 20:04:56]

The rest of the fetchers are in mojo/shell. Is there a reason this should be in
a different place?

[yzshen1, 2015/08/05 16:11:08]

Because all the other fetchers are used by mojo/shell/application_manager, while
this one is used by mojo/runner/context

My understanding is that an implementation of an interface lives at where it is
used, instead of where the interface is defined.

What do you think? Thanks!

[sky, 2015/08/05 17:35:49]

Ok, makes sense.

+ public:
+  static const char kAboutScheme[];
+  static const char kAboutBlankURL[];
+
+  AboutFetcher(const GURL& url, const FetchCallback& loader_callback);
+  ~AboutFetcher() override;
+
+ private:
+  void BuildResponse();
+
+  // Must be called exactly once to run the loader callback (asynchrously). On
+  // scuccess, the ownership of this object is passed to the loader callback;

[sky, 2015/08/04 20:04:56]

scuccess->success

[yzshen1, 2015/08/05 16:11:08]

Done.

+  // otherwise, the callback is runned with a nullptr and this object is

[sky, 2015/08/04 20:04:55]

runned->run

[yzshen1, 2015/08/05 16:11:08]

Done. Sorry.

+  // destroyed.
+  void PostToRunCallback(bool success);
+
+  // shell::Fetcher implementation.
+  const GURL& GetURL() const override;
+  GURL GetRedirectURL() const override;
+  GURL GetRedirectReferer() const override;
+  URLResponsePtr AsURLResponse(base::TaskRunner* task_runner,
+                               uint32_t skip) override;
+  void AsPath(
+      base::TaskRunner* task_runner,
+      base::Callback<void(const base::FilePath&, bool)> callback) override;
+  std::string MimeType() override;
+  bool HasMojoMagic() override;
+  bool PeekFirstLine(std::string* line) override;
+
+  const GURL url_;
+  URLResponsePtr response_;
+
+  DISALLOW_COPY_AND_ASSIGN(AboutFetcher);
+};
+
+}  // namespace runner
+}  // namespace mojo
+
+#endif  // MOJO_RUNNER_ABOUT_FETCHER_H_