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90 lines
3.6 KiB
C++
90 lines
3.6 KiB
C++
// Copyright 2014 The Chromium Authors
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef NET_BASE_PROXY_DELEGATE_H_
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#define NET_BASE_PROXY_DELEGATE_H_
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#include <string>
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#include "net/base/net_errors.h"
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#include "net/base/net_export.h"
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#include "net/base/network_anonymization_key.h"
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#include "net/base/proxy_chain.h"
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#include "net/proxy_resolution/proxy_retry_info.h"
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class GURL;
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namespace net {
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class HttpRequestHeaders;
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class HttpResponseHeaders;
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class ProxyInfo;
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class ProxyResolutionService;
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// Delegate for setting up a connection.
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class NET_EXPORT ProxyDelegate {
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public:
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ProxyDelegate() = default;
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ProxyDelegate(const ProxyDelegate&) = delete;
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ProxyDelegate& operator=(const ProxyDelegate&) = delete;
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virtual ~ProxyDelegate() = default;
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// Called as the proxy is being resolved for |url| for a |method| request.
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// The caller may pass an empty string to get method agnostic resoulution.
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// Allows the delegate to override the proxy resolution decision made by
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// ProxyResolutionService. The delegate may override the decision by modifying
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// the ProxyInfo |result|.
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virtual void OnResolveProxy(
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const GURL& url,
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const NetworkAnonymizationKey& network_anonymization_key,
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const std::string& method,
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const ProxyRetryInfoMap& proxy_retry_info,
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ProxyInfo* result) = 0;
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// Called when use of a proxy chain failed due to `net_error`, but another
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// proxy chain in the list succeeded. The failed proxy is within `bad_chain`,
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// but it is undefined at which proxy in that chain. `net_error` is the
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// network error encountered, if any, and OK if the fallback was for a reason
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// other than a network error (e.g. the proxy service was explicitly directed
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// to skip a proxy).
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//
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// This method is called for each bad chain in the proxy list after a request
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// has ultimately been successful. If the request fails for all proxies in the
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// list, this method will not be called.
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virtual void OnFallback(const ProxyChain& bad_chain, int net_error) = 0;
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// Called when a request is successful after failing with one or more proxy
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// chains in the list. This is called before OnFallback is called for each new
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// failing proxy chain.
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virtual void OnSuccessfulRequestAfterFailures(
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const ProxyRetryInfoMap& proxy_retry_info) = 0;
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// Called immediately before a proxy tunnel request is sent. Provides the
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// embedder an opportunity to add extra request headers. Returning any value
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// other than OK will cause the connection to fail with that error.
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virtual Error OnBeforeTunnelRequest(const ProxyChain& proxy_chain,
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size_t chain_index,
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HttpRequestHeaders* extra_headers) = 0;
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// Called when the response headers for the proxy tunnel request have been
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// received. Allows the delegate to override the net error code of the tunnel
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// request. Returning OK causes the standard tunnel response handling to be
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// performed. Implementations should make sure they can trust the proxy server
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// at position `chain_index` in `proxy_chain` before making decisions based on
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// `response_headers`.
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virtual Error OnTunnelHeadersReceived(
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const ProxyChain& proxy_chain,
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size_t chain_index,
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const HttpResponseHeaders& response_headers) = 0;
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// Associates a `ProxyResolutionService` with this `ProxyDelegate`.
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// `proxy_resolution_service` must outlive `this`.
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virtual void SetProxyResolutionService(
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ProxyResolutionService* proxy_resolution_service) = 0;
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};
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} // namespace net
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#endif // NET_BASE_PROXY_DELEGATE_H_
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