// Copyright (c) 2012 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 CONTENT_PUBLIC_BROWSER_BROWSER_URL_HANDLER_H_
#define CONTENT_PUBLIC_BROWSER_BROWSER_URL_HANDLER_H_
#include "content/common/content_export.h"
class GURL;
namespace content {
class BrowserContext;
// 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).
// BrowserURLHandler manages the list of all special URLs and manages
// dispatching the URL handling to registered handlers.
class CONTENT_EXPORT 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,
BrowserContext* browser_context);
// Returns the null handler for use with |AddHandlerPair()|.
static URLHandler null_handler();
// 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.
virtual void RewriteURLIfNecessary(GURL* url,
BrowserContext* browser_context,
bool* reverse_on_redirect) = 0;
// Add the specified handler pair to the list of URL handlers.
//
// Note that normally, the reverse handler is only used if the modified URL is
// not modified, e.g., by adding a hash fragment. To support this behavior,
// register the forward and reverse handlers separately, each with a
// null_handler() for the opposite direction.
virtual void AddHandlerPair(URLHandler handler,
URLHandler reverse_handler) = 0;
protected:
virtual ~BrowserURLHandler() {}
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_BROWSER_URL_HANDLER_H_