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mojo/shell/application_manager/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 SHELL_APPLICATION_MANAGER_FETCHER_H_
+#define SHELL_APPLICATION_MANAGER_FETCHER_H_
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+
+#include "mojo/services/network/public/interfaces/url_loader.mojom.h"
+
+class GURL;
+
+namespace base {
+class FilePath;
+class TaskRunner;
+}
+
+namespace mojo {
+namespace shell {
+
+// Fetcher abstracts getting an application by either file or http[s] URL.
+//
+// Although it is possible to use the Network implementation for http[s] URLs
+// (because the underlying net library knows how to handle them), it is
+// extremely slow because network responses must be copied to disk in order to
+// get a file handle we can use with dlopen.
+//
+// Until this is solved, we use two different implementations so that
+// performance isn't completely absymal.
+class Fetcher {
+ public:
+  // The param will be null in the case where the content could not be fetched.
+  // Reasons include:
+  // - network error
+  // - 4x or 5x HTTP errors
+  typedef base::Callback<void(scoped_ptr<Fetcher>)> FetchCallback;
+
+  Fetcher(const FetchCallback& fetch_callback);
+  virtual ~Fetcher();
+
+  // Returns the original URL that was fetched.
+  virtual const GURL& GetURL() const = 0;
+
+  // If the fetch resulted in a redirect, this returns the final URL after all
+  // redirects. Otherwise, it returns an empty URL.
+  virtual GURL GetRedirectURL() const = 0;
+
+  virtual URLResponsePtr AsURLResponse(base::TaskRunner* task_runner,
+                                       uint32_t skip) = 0;
+
+  virtual void AsPath(
+      base::TaskRunner* task_runner,
+      base::Callback<void(const base::FilePath&, bool)> callback) = 0;
+
+  virtual std::string MimeType() = 0;
+
+  virtual bool HasMojoMagic() = 0;
+
+  virtual bool PeekFirstLine(std::string* line) = 0;
+
+  bool PeekContentHandler(std::string* mojo_shebang,
+                          GURL* mojo_content_handler_url);
+
+ protected:
+  static const char kMojoMagic[];
+  static const size_t kMaxShebangLength;
+
+  FetchCallback loader_callback_;
+};
+
+}  // namespace shell
+}  // namespace mojo
+
+#endif  // SHELL_APPLICATION_MANAGER_FETCHER_H_