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// Copyright 2010 The Chromium Authors
// 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 <string>
#include "base/logging.h"
#include "base/strings/pattern.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_split.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "net/base/host_port_pair.h"
#include "net/base/url_util.h"
#include "url/gurl.h"
#include "url/third_party/mozilla/url_parse.h"
#include "url/url_canon.h"
namespace net {
struct HostMappingRules::MapRule {
MapRule() = default;
std::string hostname_pattern;
std::string replacement_hostname;
int replacement_port = -1;
};
struct HostMappingRules::ExclusionRule {
std::string hostname_pattern;
};
HostMappingRules::HostMappingRules() = default;
HostMappingRules::HostMappingRules(const HostMappingRules& host_mapping_rules) =
default;
HostMappingRules::~HostMappingRules() = default;
HostMappingRules& HostMappingRules::operator=(
const HostMappingRules& host_mapping_rules) = default;
bool HostMappingRules::RewriteHost(HostPortPair* host_port) const {
// Check if the hostname was remapped.
for (const auto& map_rule : map_rules_) {
// 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 (!base::MatchPattern(host_port->host(), map_rule.hostname_pattern)) {
std::string host_port_string = host_port->ToString();
if (!base::MatchPattern(host_port_string, map_rule.hostname_pattern))
continue; // This rule doesn't apply.
}
// Check if the hostname was excluded.
for (const auto& exclusion_rule : exclusion_rules_) {
if (base::MatchPattern(host_port->host(),
exclusion_rule.hostname_pattern))
return false;
}
host_port->set_host(map_rule.replacement_hostname);
if (map_rule.replacement_port != -1)
host_port->set_port(static_cast<uint16_t>(map_rule.replacement_port));
return true;
}
return false;
}
HostMappingRules::RewriteResult HostMappingRules::RewriteUrl(GURL& url) const {
// Must be a valid and standard URL. Otherwise, Chrome might not know how to
// find/replace the contained host or port.
DCHECK(url.is_valid());
DCHECK(url.IsStandard());
DCHECK(url.has_host());
HostPortPair host_port_pair = HostPortPair::FromURL(url);
if (!RewriteHost(&host_port_pair))
return RewriteResult::kNoMatchingRule;
GURL::Replacements replacements;
std::string port_str = base::NumberToString(host_port_pair.port());
replacements.SetPortStr(port_str);
std::string host_str = host_port_pair.HostForURL();
replacements.SetHostStr(host_str);
GURL new_url = url.ReplaceComponents(replacements);
if (!new_url.is_valid())
return RewriteResult::kInvalidRewrite;
DCHECK(new_url.IsStandard());
DCHECK(new_url.has_host());
DCHECK_EQ(url.EffectiveIntPort() == url::PORT_UNSPECIFIED,
new_url.EffectiveIntPort() == url::PORT_UNSPECIFIED);
url = std::move(new_url);
return RewriteResult::kRewritten;
}
bool HostMappingRules::AddRuleFromString(std::string_view rule_string) {
std::vector<std::string_view> parts = base::SplitStringPiece(
base::TrimWhitespaceASCII(rule_string, base::TRIM_ALL), " ",
base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
// Test for EXCLUSION rule.
if (parts.size() == 2 &&
base::EqualsCaseInsensitiveASCII(parts[0], "exclude")) {
ExclusionRule rule;
rule.hostname_pattern = base::ToLowerASCII(parts[1]);
exclusion_rules_.push_back(rule);
return true;
}
// Test for MAP rule.
if (parts.size() == 3 && base::EqualsCaseInsensitiveASCII(parts[0], "map")) {
MapRule rule;
rule.hostname_pattern = base::ToLowerASCII(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(std::string_view rules_string) {
exclusion_rules_.clear();
map_rules_.clear();
std::vector<std::string_view> rules = base::SplitStringPiece(
rules_string, ",", base::TRIM_WHITESPACE, base::SPLIT_WANT_ALL);
for (std::string_view rule : rules) {
bool ok = AddRuleFromString(rule);
LOG_IF(ERROR, !ok) << "Failed parsing rule: " << rule;
}
}
} // namespace net
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