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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef NET_BASE_PROXY_DELEGATE_H_
#define NET_BASE_PROXY_DELEGATE_H_
#include <string>
#include "net/base/net_errors.h"
#include "net/base/net_export.h"
#include "net/base/network_anonymization_key.h"
#include "net/base/proxy_chain.h"
#include "net/proxy_resolution/proxy_retry_info.h"
class GURL;
namespace net {
class HttpRequestHeaders;
class HttpResponseHeaders;
class ProxyInfo;
// Delegate for setting up a connection.
class NET_EXPORT ProxyDelegate {
public:
ProxyDelegate() = default;
ProxyDelegate(const ProxyDelegate&) = delete;
ProxyDelegate& operator=(const ProxyDelegate&) = delete;
virtual ~ProxyDelegate() = default;
// Called as the proxy is being resolved for |url| for a |method| request.
// The caller may pass an empty string to get method agnostic resoulution.
// Allows the delegate to override the proxy resolution decision made by
// ProxyResolutionService. The delegate may override the decision by modifying
// the ProxyInfo |result|.
virtual void OnResolveProxy(
const GURL& url,
const NetworkAnonymizationKey& network_anonymization_key,
const std::string& method,
const ProxyRetryInfoMap& proxy_retry_info,
ProxyInfo* result) = 0;
// Called when use of a proxy chain failed due to `net_error`, but another
// proxy chain in the list succeeded. The failed proxy is within `bad_chain`,
// but it is undefined at which proxy in that chain. `net_error` is the
// network error encountered, if any, and OK if the fallback was for a reason
// other than a network error (e.g. the proxy service was explicitly directed
// to skip a proxy).
virtual void OnFallback(const ProxyChain& bad_chain, int net_error) = 0;
// Called immediately before a proxy tunnel request is sent. Provides the
// embedder an opportunity to add extra request headers.
virtual void OnBeforeTunnelRequest(const ProxyChain& proxy_chain,
size_t chain_index,
HttpRequestHeaders* extra_headers) = 0;
// Called when the response headers for the proxy tunnel request have been
// received. Allows the delegate to override the net error code of the tunnel
// request. Returning OK causes the standard tunnel response handling to be
// performed. Implementations should make sure they can trust the proxy server
// at position `chain_index` in `proxy_chain` before making decisions based on
// `response_headers`.
virtual Error OnTunnelHeadersReceived(
const ProxyChain& proxy_chain,
size_t chain_index,
const HttpResponseHeaders& response_headers) = 0;
// Compatibility methods for the transition to using ProxyChain instead of
// ProxyServer. TODO(crbug.com/1491092): Remove these methods.
void OnFallbackServerOnly(const ProxyServer& bad_server, int net_error) {
OnFallback(ProxyChain(bad_server), net_error);
}
void OnBeforeTunnelRequestServerOnly(const ProxyChain& proxy_chain,
size_t proxy_chain_index,
HttpRequestHeaders* extra_headers) {
DCHECK(!proxy_chain.is_direct());
OnBeforeTunnelRequest(proxy_chain, proxy_chain_index, extra_headers);
}
Error OnTunnelHeadersReceivedServerOnly(
const ProxyChain& proxy_chain,
size_t proxy_chain_index,
const HttpResponseHeaders& response_headers) {
return OnTunnelHeadersReceived(proxy_chain, proxy_chain_index,
response_headers);
}
};
} // namespace net
#endif // NET_BASE_PROXY_DELEGATE_H_
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