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      1 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 // We handle some special browser-level URLs (like "about:version")
      6 // before they're handed to a renderer.  This lets us do the URL handling
      7 // on the browser side (which has access to more information than the
      8 // renderers do) as well as sidestep the risk of exposing data to
      9 // random web pages (because from the resource loader's perspective, these
     10 // URL schemes don't exist).
     11 
     12 #ifndef CHROME_BROWSER_BROWSER_URL_HANDLER_H_
     13 #define CHROME_BROWSER_BROWSER_URL_HANDLER_H_
     14 #pragma once
     15 
     16 #include <vector>
     17 #include <utility>
     18 
     19 class GURL;
     20 class Profile;
     21 
     22 // BrowserURLHandler manages the list of all special URLs and manages
     23 // dispatching the URL handling to registered handlers.
     24 class BrowserURLHandler {
     25  public:
     26   // The type of functions that can process a URL.
     27   // If a handler handles |url|, it should :
     28   // - optionally modify |url| to the URL that should be sent to the renderer
     29   // If the URL is not handled by a handler, it should return false.
     30   typedef bool (*URLHandler)(GURL* url, Profile* profile);
     31 
     32   // RewriteURLIfNecessary gives all registered URLHandlers a shot at processing
     33   // the given URL, and modifies it in place.
     34   // If the original URL needs to be adjusted if the modified URL is redirected,
     35   // this function sets |reverse_on_redirect| to true.
     36   static void RewriteURLIfNecessary(GURL* url, Profile* profile,
     37                                     bool* reverse_on_redirect);
     38 
     39   // Reverses the rewriting that was done for |original| using the new |url|.
     40   static bool ReverseURLRewrite(GURL* url, const GURL& original,
     41                                 Profile* profile);
     42 
     43   // We initialize the list of url_handlers_ lazily the first time
     44   // RewriteURLIfNecessary is called.
     45   static void InitURLHandlers();
     46 
     47  private:
     48   // The list of known URLHandlers, optionally with reverse-rewriters.
     49   typedef std::pair<URLHandler, URLHandler> HandlerPair;
     50   static std::vector<HandlerPair> url_handlers_;
     51 };
     52 
     53 #endif  // CHROME_BROWSER_BROWSER_URL_HANDLER_H_
     54