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| 1 // Copyright (c) 2011 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 // ProxyScriptFetcher is an async interface for fetching a proxy auto config | |
| 6 // script. It is specific to fetching a PAC script; enforces timeout, max-size, | |
| 7 // status code. | |
| 8 | |
| 9 #ifndef NET_PROXY_PROXY_SCRIPT_FETCHER_H_ | |
| 10 #define NET_PROXY_PROXY_SCRIPT_FETCHER_H_ | |
| 11 | |
| 12 #include "base/strings/string16.h" | |
| 13 #include "net/base/completion_callback.h" | |
| 14 #include "net/base/net_export.h" | |
| 15 | |
| 16 class GURL; | |
| 17 | |
| 18 namespace net { | |
| 19 | |
| 20 class URLRequestContext; | |
| 21 | |
| 22 // Interface for downloading a PAC script. Implementations can enforce | |
| 23 // timeouts, maximum size constraints, content encoding, etc.. | |
| 24 class NET_EXPORT_PRIVATE ProxyScriptFetcher { | |
| 25 public: | |
| 26 // Destruction should cancel any outstanding requests. | |
| 27 virtual ~ProxyScriptFetcher() {} | |
| 28 | |
| 29 // Downloads the given PAC URL, and invokes |callback| on completion. | |
| 30 // Returns OK on success, otherwise the error code. If the return code is | |
| 31 // ERR_IO_PENDING, then the request completes asynchronously, and |callback| | |
| 32 // will be invoked later with the final error code. | |
| 33 // After synchronous or asynchronous completion with a result code of OK, | |
| 34 // |*utf16_text| is filled with the response. On failure, the result text is | |
| 35 // an empty string, and the result code is a network error. Some special | |
| 36 // network errors that may occur are: | |
| 37 // | |
| 38 // ERR_TIMED_OUT -- the fetch took too long to complete. | |
| 39 // ERR_FILE_TOO_BIG -- the response's body was too large. | |
| 40 // ERR_PAC_STATUS_NOT_OK -- non-200 HTTP status code. | |
| 41 // ERR_NOT_IMPLEMENTED -- the response required authentication. | |
| 42 // | |
| 43 // If the request is cancelled (either using the "Cancel()" method or by | |
| 44 // deleting |this|), then no callback is invoked. | |
| 45 // | |
| 46 // Only one fetch is allowed to be outstanding at a time. | |
| 47 virtual int Fetch(const GURL& url, base::string16* utf16_text, | |
| 48 const net::CompletionCallback& callback) = 0; | |
| 49 | |
| 50 // Aborts the in-progress fetch (if any). | |
| 51 virtual void Cancel() = 0; | |
| 52 | |
| 53 // Returns the request context that this fetcher uses to issue downloads, | |
| 54 // or NULL. | |
| 55 virtual URLRequestContext* GetRequestContext() const = 0; | |
| 56 }; | |
| 57 | |
| 58 } // namespace net | |
| 59 | |
| 60 #endif // NET_PROXY_PROXY_SCRIPT_FETCHER_H_ | |
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