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// Copyright 2011 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// PacFileFetcher is an async interface for fetching a proxy auto config
// script. It is specific to fetching a PAC script; enforces timeout, max-size,
// status code.
#ifndef NET_PROXY_RESOLUTION_PAC_FILE_FETCHER_H_
#define NET_PROXY_RESOLUTION_PAC_FILE_FETCHER_H_
#include <string>
#include "net/base/completion_once_callback.h"
#include "net/base/isolation_info.h"
#include "net/base/net_export.h"
#include "net/traffic_annotation/network_traffic_annotation.h"
class GURL;
namespace net {
class URLRequestContext;
// Interface for downloading a PAC script. Implementations can enforce
// timeouts, maximum size constraints, content encoding, etc..
class NET_EXPORT_PRIVATE PacFileFetcher {
public:
PacFileFetcher();
PacFileFetcher(const PacFileFetcher&) = delete;
PacFileFetcher& operator=(const PacFileFetcher&) = delete;
// Destruction should cancel any outstanding requests.
virtual ~PacFileFetcher();
// Downloads the given PAC URL, 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_TIMED_OUT -- the fetch took too long to complete.
// ERR_FILE_TOO_BIG -- the response's body was too large.
// ERR_HTTP_RESPONSE_CODE_FAILURE -- non-200 HTTP status code.
// ERR_NOT_IMPLEMENTED -- the response 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(const GURL& url,
std::u16string* utf16_text,
CompletionOnceCallback callback,
const NetworkTrafficAnnotationTag traffic_annotation) = 0;
// Aborts the in-progress fetch (if any).
virtual void Cancel() = 0;
// Returns the request context that this fetcher uses to issue downloads,
// or NULL.
virtual URLRequestContext* GetRequestContext() const = 0;
// Fails the in-progress fetch (if any) and future requests will fail
// immediately. GetRequestContext() will always return nullptr after this is
// called. Must be called before the URLRequestContext the fetcher was
// created with is torn down.
virtual void OnShutdown() = 0;
const IsolationInfo& isolation_info() const { return isolation_info_; }
private:
// Transient IsolationInfo used to fetch PAC scripts and resolve hostnames.
// Safe to reuse because delays for WPAD fetches don't provide information
// to the web platform useful to attackers, and WPAD fetches uniformly
// block all network requests.
const IsolationInfo isolation_info_ =
IsolationInfo::CreateTransient(/*nonce=*/std::nullopt);
};
} // namespace net
#endif // NET_PROXY_RESOLUTION_PAC_FILE_FETCHER_H_
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