Move BrowserURLHandler to content, and keep the Chrome specific ones in Chrome.

BUG=76697
Review URL: http://codereview.chromium.org/7351020

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@92427 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 71 insertions, 0 deletions

diff --git a/content/browser/browser_url_handler.h b/content/browser/browser_url_handler.h
new file mode 100644
index 0000000..dc86a72
--- /dev/null
+++ b/content/browser/browser_url_handler.h
@@ -0,0 +1,71 @@
+// Copyright (c) 2011 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.
+
+// We handle some special browser-level URLs (like "about:version")
+// before they're handed to a renderer.  This lets us do the URL handling
+// on the browser side (which has access to more information than the
+// renderers do) as well as sidestep the risk of exposing data to
+// random web pages (because from the resource loader's perspective, these
+// URL schemes don't exist).
+
+#ifndef CONTENT_BROWSER_BROWSER_URL_HANDLER_H_
+#define CONTENT_BROWSER_BROWSER_URL_HANDLER_H_
+#pragma once
+
+#include <vector>
+#include <utility>
+
+#include "base/gtest_prod_util.h"
+#include "base/memory/singleton.h"
+
+class GURL;
+class Profile;
+
+// BrowserURLHandler manages the list of all special URLs and manages
+// dispatching the URL handling to registered handlers.
+class BrowserURLHandler {
+ public:
+  // The type of functions that can process a URL.
+  // If a handler handles |url|, it should :
+  // - optionally modify |url| to the URL that should be sent to the renderer
+  // If the URL is not handled by a handler, it should return false.
+  typedef bool (*URLHandler)(GURL* url, Profile* profile);
+
+  // Returns the singleton instance.
+  static BrowserURLHandler* GetInstance();
+
+  // RewriteURLIfNecessary gives all registered URLHandlers a shot at processing
+  // the given URL, and modifies it in place.
+  // If the original URL needs to be adjusted if the modified URL is redirected,
+  // this function sets |reverse_on_redirect| to true.
+  void RewriteURLIfNecessary(GURL* url, Profile* profile,
+                             bool* reverse_on_redirect);
+
+  // Reverses the rewriting that was done for |original| using the new |url|.
+  bool ReverseURLRewrite(GURL* url, const GURL& original,
+                         Profile* profile);
+
+  // Add the specified handler pair to the list of URL handlers.
+  void AddHandlerPair(URLHandler handler, URLHandler reverse_handler);
+
+  // Returns the null handler for use with |AddHandlerPair()|.
+  static URLHandler null_handler();
+
+ private:
+  // This object is a singleton:
+  BrowserURLHandler();
+  ~BrowserURLHandler();
+  friend struct DefaultSingletonTraits<BrowserURLHandler>;
+
+  // The list of known URLHandlers, optionally with reverse-rewriters.
+  typedef std::pair<URLHandler, URLHandler> HandlerPair;
+  std::vector<HandlerPair> url_handlers_;
+
+  FRIEND_TEST_ALL_PREFIXES(BrowserURLHandlerTest, BasicRewriteAndReverse);
+  FRIEND_TEST_ALL_PREFIXES(BrowserURLHandlerTest, NullHandlerReverse);
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserURLHandler);
+};
+
+#endif  // CONTENT_BROWSER_BROWSER_URL_HANDLER_H_