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// Copyright (c) 2010 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 CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_
#define CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_
#pragma once
#include <string>
class DictionaryValue;
class GURL;
class PrefService;
class ExternalProtocolHandler {
public:
enum BlockState {
DONT_BLOCK,
BLOCK,
UNKNOWN,
};
// Returns whether we should block a given scheme.
static BlockState GetBlockState(const std::string& scheme);
// Sets whether we should block a given scheme.
static void SetBlockState(const std::string& scheme, BlockState state);
// Checks to see if the protocol is allowed, if it is whitelisted,
// the application associated with the protocol is launched on the io thread,
// if it is blacklisted, returns silently. Otherwise, an
// ExternalProtocolDialog is created asking the user. If the user accepts,
// LaunchUrlWithoutSecurityCheck is called on the io thread and the
// application is launched.
// Must run on the UI thread.
static void LaunchUrl(const GURL& url, int render_process_host_id,
int tab_contents_id);
// Creates and runs a External Protocol dialog box.
// |url| - The url of the request.
// |render_process_host_id| and |routing_id| are used by
// tab_util::GetTabContentsByID to aquire the tab contents associated with
// this dialog.
// NOTE: There is a race between the Time of Check and the Time Of Use for
// the command line. Since the caller (web page) does not have access
// to change the command line by itself, we do not do anything special
// to protect against this scenario.
// This is implemented separately on each platform.
static void RunExternalProtocolDialog(const GURL& url,
int render_process_host_id,
int routing_id);
// Register the ExcludedSchemes preference.
static void RegisterPrefs(PrefService* prefs);
// Starts a url using the external protocol handler with the help
// of shellexecute. Should only be called if the protocol is whitelisted
// (checked in LaunchUrl) or if the user explicitly allows it. (By selecting
// "Launch Application" in an ExternalProtocolDialog.) It is assumed that the
// url has already been escaped, which happens in LaunchUrl.
// NOTE: You should Not call this function directly unless you are sure the
// url you have has been checked against the blacklist, and has been escaped.
// All calls to this function should originate in some way from LaunchUrl.
// This will execute on the file thread.
static void LaunchUrlWithoutSecurityCheck(const GURL& url);
// Prepopulates the dictionary with known protocols to deny or allow, if
// preferences for them do not already exist.
static void PrepopulateDictionary(DictionaryValue* win_pref);
// Allows LaunchUrl to proceed with launching an external protocol handler.
// This is typically triggered by a user gesture, but is also called for
// each extension API function. Note that each call to LaunchUrl resets
// the state to false (not allowed).
static void PermitLaunchUrl();
};
#endif // CHROME_BROWSER_EXTERNAL_PROTOCOL_HANDLER_H_
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