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// Copyright (c) 2010 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/base/host_mapping_rules.h"
#include "base/logging.h"
#include "base/string_split.h"
#include "base/string_tokenizer.h"
#include "base/string_util.h"
#include "net/base/host_port_pair.h"
#include "net/base/net_util.h"
namespace net {
struct HostMappingRules::MapRule {
MapRule() : replacement_port(-1) {}
std::string hostname_pattern;
std::string replacement_hostname;
int replacement_port;
};
struct HostMappingRules::ExclusionRule {
std::string hostname_pattern;
};
HostMappingRules::HostMappingRules() {}
HostMappingRules::~HostMappingRules() {}
bool HostMappingRules::RewriteHost(HostPortPair* host_port) const {
// Check if the hostname was excluded.
for (ExclusionRuleList::const_iterator it = exclusion_rules_.begin();
it != exclusion_rules_.end(); ++it) {
const ExclusionRule& rule = *it;
if (MatchPattern(host_port->host(), rule.hostname_pattern))
return false;
}
// Check if the hostname was remapped.
for (MapRuleList::const_iterator it = map_rules_.begin();
it != map_rules_.end(); ++it) {
const MapRule& rule = *it;
// The rule's hostname_pattern will be something like:
// www.foo.com
// *.foo.com
// www.foo.com:1234
// *.foo.com:1234
// First, we'll check for a match just on hostname.
// If that fails, we'll check for a match with both hostname and port.
if (!MatchPattern(host_port->host(), rule.hostname_pattern)) {
std::string host_port_string = host_port->ToString();
if (!MatchPattern(host_port_string, rule.hostname_pattern))
continue; // This rule doesn't apply.
}
host_port->set_host(rule.replacement_hostname);
if (rule.replacement_port != -1)
host_port->set_port(rule.replacement_port);
return true;
}
return false;
}
bool HostMappingRules::AddRuleFromString(const std::string& rule_string) {
std::string trimmed;
TrimWhitespaceASCII(rule_string, TRIM_ALL, &trimmed);
std::vector<std::string> parts;
SplitString(trimmed, ' ', &parts);
// Test for EXCLUSION rule.
if (parts.size() == 2 && LowerCaseEqualsASCII(parts[0], "exclude")) {
ExclusionRule rule;
rule.hostname_pattern = StringToLowerASCII(parts[1]);
exclusion_rules_.push_back(rule);
return true;
}
// Test for MAP rule.
if (parts.size() == 3 && LowerCaseEqualsASCII(parts[0], "map")) {
MapRule rule;
rule.hostname_pattern = StringToLowerASCII(parts[1]);
if (!ParseHostAndPort(parts[2], &rule.replacement_hostname,
&rule.replacement_port)) {
return false; // Failed parsing the hostname/port.
}
map_rules_.push_back(rule);
return true;
}
return false;
}
void HostMappingRules::SetRulesFromString(const std::string& rules_string) {
exclusion_rules_.clear();
map_rules_.clear();
StringTokenizer rules(rules_string, ",");
while (rules.GetNext()) {
bool ok = AddRuleFromString(rules.token());
LOG_IF(ERROR, !ok) << "Failed parsing rule: " << rules.token();
}
}
} // namespace net
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