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// 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.
#include "net/proxy_resolution/proxy_list.h"
#include "base/callback.h"
#include "base/logging.h"
#include "base/strings/string_tokenizer.h"
#include "base/time/time.h"
#include "base/values.h"
#include "net/base/proxy_server.h"
#include "net/log/net_log.h"
#include "net/log/net_log_event_type.h"
#include "net/log/net_log_with_source.h"
using base::TimeDelta;
using base::TimeTicks;
namespace net {
ProxyList::ProxyList() = default;
ProxyList::ProxyList(const ProxyList& other) = default;
ProxyList::ProxyList(ProxyList&& other) = default;
ProxyList& ProxyList::operator=(const ProxyList& other) = default;
ProxyList& ProxyList::operator=(ProxyList&& other) = default;
ProxyList::~ProxyList() = default;
void ProxyList::Set(const std::string& proxy_uri_list) {
proxies_.clear();
base::StringTokenizer str_tok(proxy_uri_list, ";");
while (str_tok.GetNext()) {
ProxyServer uri =
ProxyServer::FromURI(str_tok.token_piece(), ProxyServer::SCHEME_HTTP);
// Silently discard malformed inputs.
if (uri.is_valid())
proxies_.push_back(uri);
}
}
void ProxyList::SetSingleProxyServer(const ProxyServer& proxy_server) {
proxies_.clear();
AddProxyServer(proxy_server);
}
void ProxyList::AddProxyServer(const ProxyServer& proxy_server) {
if (proxy_server.is_valid())
proxies_.push_back(proxy_server);
}
void ProxyList::DeprioritizeBadProxies(
const ProxyRetryInfoMap& proxy_retry_info) {
// Partition the proxy list in two:
// (1) the known bad proxies
// (2) everything else
std::vector<ProxyServer> good_proxies;
std::vector<ProxyServer> bad_proxies_to_try;
std::vector<ProxyServer>::const_iterator iter = proxies_.begin();
for (; iter != proxies_.end(); ++iter) {
auto bad_proxy = proxy_retry_info.find(iter->ToURI());
if (bad_proxy != proxy_retry_info.end()) {
// This proxy is bad. Check if it's time to retry.
if (bad_proxy->second.bad_until >= TimeTicks::Now()) {
// still invalid.
if (bad_proxy->second.try_while_bad)
bad_proxies_to_try.push_back(*iter);
continue;
}
}
good_proxies.push_back(*iter);
}
// "proxies_ = good_proxies + bad_proxies"
proxies_.swap(good_proxies);
proxies_.insert(proxies_.end(), bad_proxies_to_try.begin(),
bad_proxies_to_try.end());
}
void ProxyList::RemoveProxiesWithoutScheme(int scheme_bit_field) {
for (auto it = proxies_.begin(); it != proxies_.end();) {
if (!(scheme_bit_field & it->scheme())) {
it = proxies_.erase(it);
continue;
}
++it;
}
}
void ProxyList::Clear() {
proxies_.clear();
}
bool ProxyList::IsEmpty() const {
return proxies_.empty();
}
size_t ProxyList::size() const {
return proxies_.size();
}
// Returns true if |*this| lists the same proxies as |other|.
bool ProxyList::Equals(const ProxyList& other) const {
if (size() != other.size())
return false;
return proxies_ == other.proxies_;
}
const ProxyServer& ProxyList::Get() const {
CHECK(!proxies_.empty());
return proxies_[0];
}
const std::vector<ProxyServer>& ProxyList::GetAll() const {
return proxies_;
}
void ProxyList::SetFromPacString(const std::string& pac_string) {
base::StringTokenizer entry_tok(pac_string, ";");
proxies_.clear();
while (entry_tok.GetNext()) {
ProxyServer uri = ProxyServer::FromPacString(entry_tok.token_piece());
// Silently discard malformed inputs.
if (uri.is_valid())
proxies_.push_back(uri);
}
// If we failed to parse anything from the PAC results list, fallback to
// DIRECT (this basically means an error in the PAC script).
if (proxies_.empty()) {
proxies_.push_back(ProxyServer::Direct());
}
}
std::string ProxyList::ToPacString() const {
std::string proxy_list;
auto iter = proxies_.begin();
for (; iter != proxies_.end(); ++iter) {
if (!proxy_list.empty())
proxy_list += ";";
proxy_list += iter->ToPacString();
}
return proxy_list.empty() ? std::string() : proxy_list;
}
base::Value ProxyList::ToValue() const {
base::Value list(base::Value::Type::LIST);
for (const auto& proxy : proxies_)
list.Append(proxy.ToURI());
return list;
}
bool ProxyList::Fallback(ProxyRetryInfoMap* proxy_retry_info,
int net_error,
const NetLogWithSource& net_log) {
if (proxies_.empty()) {
NOTREACHED();
return false;
}
// By default, proxies are not retried for 5 minutes.
UpdateRetryInfoOnFallback(proxy_retry_info, TimeDelta::FromMinutes(5), true,
std::vector<ProxyServer>(), net_error, net_log);
// Remove this proxy from our list.
proxies_.erase(proxies_.begin());
return !proxies_.empty();
}
void ProxyList::AddProxyToRetryList(ProxyRetryInfoMap* proxy_retry_info,
base::TimeDelta retry_delay,
bool try_while_bad,
const ProxyServer& proxy_to_retry,
int net_error,
const NetLogWithSource& net_log) const {
// Mark this proxy as bad.
TimeTicks bad_until = TimeTicks::Now() + retry_delay;
std::string proxy_key = proxy_to_retry.ToURI();
auto iter = proxy_retry_info->find(proxy_key);
if (iter == proxy_retry_info->end() || bad_until > iter->second.bad_until) {
ProxyRetryInfo retry_info;
retry_info.current_delay = retry_delay;
retry_info.bad_until = bad_until;
retry_info.try_while_bad = try_while_bad;
retry_info.net_error = net_error;
(*proxy_retry_info)[proxy_key] = retry_info;
}
net_log.AddEventWithStringParams(NetLogEventType::PROXY_LIST_FALLBACK,
"bad_proxy", proxy_key);
}
void ProxyList::UpdateRetryInfoOnFallback(
ProxyRetryInfoMap* proxy_retry_info,
base::TimeDelta retry_delay,
bool reconsider,
const std::vector<ProxyServer>& additional_proxies_to_bypass,
int net_error,
const NetLogWithSource& net_log) const {
DCHECK(!retry_delay.is_zero());
if (proxies_.empty()) {
NOTREACHED();
return;
}
if (!proxies_[0].is_direct()) {
AddProxyToRetryList(proxy_retry_info,
retry_delay,
reconsider,
proxies_[0],
net_error,
net_log);
// If any additional proxies to bypass are specified, add to the retry map
// as well.
for (const ProxyServer& additional_proxy : additional_proxies_to_bypass) {
AddProxyToRetryList(proxy_retry_info, retry_delay, reconsider,
additional_proxy, net_error, net_log);
}
}
}
} // namespace net
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