| // 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 NET_PROXY_DHCP_SCRIPT_FETCHER_H_ |
| #define NET_PROXY_DHCP_SCRIPT_FETCHER_H_ |
| |
| #include "base/basictypes.h" |
| #include "base/compiler_specific.h" |
| #include "base/strings/string16.h" |
| #include "net/base/completion_callback.h" |
| #include "net/base/net_export.h" |
| #include "net/proxy/proxy_script_fetcher.h" |
| #include "url/gurl.h" |
| |
| namespace net { |
| |
| // Interface for classes that can fetch a proxy script as configured via DHCP. |
| // |
| // The Fetch method on this interface tries to retrieve the most appropriate |
| // PAC script configured via DHCP. |
| // |
| // Normally there are zero or one DHCP scripts configured, but in the |
| // presence of multiple adapters with DHCP enabled, the fetcher resolves |
| // which PAC script to use if one or more are available. |
| class NET_EXPORT_PRIVATE DhcpProxyScriptFetcher { |
| public: |
| // Destruction should cancel any outstanding requests. |
| virtual ~DhcpProxyScriptFetcher(); |
| |
| // Attempts to retrieve the most appropriate PAC script configured via DHCP, |
| // and invokes |callback| on completion. |
| // |
| // Returns OK on success, otherwise the error code. If the return code is |
| // ERR_IO_PENDING, then the request completes asynchronously, and |callback| |
| // will be invoked later with the final error code. |
| // |
| // After synchronous or asynchronous completion with a result code of OK, |
| // |*utf16_text| is filled with the response. On failure, the result text is |
| // an empty string, and the result code is a network error. Some special |
| // network errors that may occur are: |
| // |
| // ERR_PAC_NOT_IN_DHCP -- no script configured in DHCP. |
| // |
| // The following all indicate there was one or more script configured |
| // in DHCP but all failed to download, and the error for the most |
| // preferred adapter that had a script configured was what the error |
| // code says: |
| // |
| // ERR_TIMED_OUT -- fetch took too long to complete. |
| // ERR_FILE_TOO_BIG -- response body was too large. |
| // ERR_PAC_STATUS_NOT_OK -- script failed to download. |
| // ERR_NOT_IMPLEMENTED -- script required authentication. |
| // |
| // If the request is cancelled (either using the "Cancel()" method or by |
| // deleting |this|), then no callback is invoked. |
| // |
| // Only one fetch is allowed to be outstanding at a time. |
| virtual int Fetch(base::string16* utf16_text, |
| const CompletionCallback& callback) = 0; |
| |
| // Aborts the in-progress fetch (if any). |
| virtual void Cancel() = 0; |
| |
| // After successful completion of |Fetch()|, this will return the URL |
| // retrieved from DHCP. It is reset if/when |Fetch()| is called again. |
| virtual const GURL& GetPacURL() const = 0; |
| |
| // Intended for unit tests only, so they can test that factories return |
| // the right types under given circumstances. |
| virtual std::string GetFetcherName() const; |
| |
| protected: |
| DhcpProxyScriptFetcher(); |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(DhcpProxyScriptFetcher); |
| }; |
| |
| // A do-nothing retriever, always returns synchronously with |
| // ERR_NOT_IMPLEMENTED result and empty text. |
| class NET_EXPORT_PRIVATE DoNothingDhcpProxyScriptFetcher |
| : public DhcpProxyScriptFetcher { |
| public: |
| DoNothingDhcpProxyScriptFetcher(); |
| virtual ~DoNothingDhcpProxyScriptFetcher(); |
| |
| virtual int Fetch(base::string16* utf16_text, |
| const CompletionCallback& callback) OVERRIDE; |
| virtual void Cancel() OVERRIDE; |
| virtual const GURL& GetPacURL() const OVERRIDE; |
| private: |
| GURL gurl_; |
| DISALLOW_COPY_AND_ASSIGN(DoNothingDhcpProxyScriptFetcher); |
| }; |
| |
| } // namespace net |
| |
| #endif // NET_PROXY_DHCP_SCRIPT_FETCHER_H_ |