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| 1 // Copyright (c) 2012 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 #ifndef NET_PROXY_DHCP_SCRIPT_FETCHER_FACTORY_H_ | |
| 6 #define NET_PROXY_DHCP_SCRIPT_FETCHER_FACTORY_H_ | |
| 7 | |
| 8 #include "base/basictypes.h" | |
| 9 #include "base/memory/singleton.h" | |
| 10 #include "net/base/completion_callback.h" | |
| 11 #include "net/base/net_export.h" | |
| 12 | |
| 13 namespace net { | |
| 14 | |
| 15 class DhcpProxyScriptFetcher; | |
| 16 class URLRequestContext; | |
| 17 | |
| 18 // Factory object for creating the appropriate concrete base class of | |
| 19 // DhcpProxyScriptFetcher for your operating system and settings. | |
| 20 // | |
| 21 // You might think we could just implement a DHCP client at the protocol | |
| 22 // level and have cross-platform support for retrieving PAC configuration | |
| 23 // from DHCP, but unfortunately the DHCP protocol assumes there is a single | |
| 24 // client per machine (specifically per network interface card), and there | |
| 25 // is an implicit state machine between the client and server, so adding a | |
| 26 // second client to the machine would not be advisable (see e.g. some | |
| 27 // discussion of what can happen at this URL: | |
| 28 // http://www.net.princeton.edu/multi-dhcp-one-interface-handling.html). | |
| 29 // | |
| 30 // Therefore, we have platform-specific implementations, and so we use | |
| 31 // this factory to select the right one. | |
| 32 class NET_EXPORT DhcpProxyScriptFetcherFactory { | |
| 33 public: | |
| 34 // Creates a new factory object with default settings. | |
| 35 DhcpProxyScriptFetcherFactory(); | |
| 36 | |
| 37 // Ownership is transferred to the caller. url_request_context must be valid | |
| 38 // and its lifetime must exceed that of the returned DhcpProxyScriptFetcher. | |
| 39 // | |
| 40 // Note that while a request is in progress, the fetcher may be holding a | |
| 41 // reference to |url_request_context|. Be careful not to create cycles | |
| 42 // between the fetcher and the context; you can break such cycles by calling | |
| 43 // Cancel(). | |
| 44 DhcpProxyScriptFetcher* Create(URLRequestContext* url_request_context); | |
| 45 | |
| 46 // Attempts to enable/disable the DHCP WPAD feature. Does nothing | |
| 47 // if |IsSupported()| returns false. | |
| 48 // | |
| 49 // The default is |enabled() == true|. | |
| 50 void set_enabled(bool enabled); | |
| 51 | |
| 52 // Returns true if the DHCP WPAD feature is enabled. Always returns | |
| 53 // false if |IsSupported()| is false. | |
| 54 bool enabled() const; | |
| 55 | |
| 56 // Returns true if the DHCP WPAD feature is supported on the current | |
| 57 // operating system. | |
| 58 static bool IsSupported(); | |
| 59 | |
| 60 private: | |
| 61 bool feature_enabled_; | |
| 62 | |
| 63 DISALLOW_COPY_AND_ASSIGN(DhcpProxyScriptFetcherFactory); | |
| 64 }; | |
| 65 | |
| 66 } // namespace net | |
| 67 | |
| 68 #endif // NET_PROXY_DHCP_SCRIPT_FETCHER_FACTORY_H_ | |
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