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// Copyright 2017 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 "services/network/public/cpp/client_hints.h"
#include <utility>
#include <vector>
#include "base/containers/flat_map.h"
#include "base/no_destructor.h"
#include "base/optional.h"
#include "base/stl_util.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/string_tokenizer.h"
#include "base/strings/string_util.h"
#include "net/http/structured_headers.h"
namespace network {
const char* const kClientHintsNameMapping[] = {"device-memory",
"dpr",
"width",
"viewport-width",
"rtt",
"downlink",
"ect",
"lang",
"ua",
"ua-arch",
"ua-platform",
"ua-model",
"ua-mobile",
"ua-full-version",
"ua-platform-version"};
const size_t kClientHintsMappingsCount = base::size(kClientHintsNameMapping);
static_assert(
base::size(kClientHintsNameMapping) ==
(static_cast<int>(network::mojom::WebClientHintsType::kMaxValue) + 1),
"Client Hint name table size must match network::mojom::WebClientHintsType "
"range");
namespace {
struct ClientHintNameCompator {
bool operator()(const std::string& lhs, const std::string& rhs) const {
return base::CompareCaseInsensitiveASCII(lhs, rhs) < 0;
}
};
using DecodeMap = base::flat_map<std::string,
network::mojom::WebClientHintsType,
ClientHintNameCompator>;
DecodeMap MakeDecodeMap() {
DecodeMap result;
for (size_t i = 0;
i < static_cast<int>(network::mojom::WebClientHintsType::kMaxValue) + 1;
++i) {
result.insert(
std::make_pair(kClientHintsNameMapping[i],
static_cast<network::mojom::WebClientHintsType>(i)));
}
return result;
}
const DecodeMap& GetDecodeMap() {
static const base::NoDestructor<DecodeMap> decode_map(MakeDecodeMap());
return *decode_map;
}
} // namespace
base::Optional<std::vector<network::mojom::WebClientHintsType>>
ParseClientHintsHeader(const std::string& header) {
// Accept-CH is an sh-list of tokens; see:
// https://httpwg.org/http-extensions/client-hints.html#rfc.section.3.1
base::Optional<net::structured_headers::List> maybe_list =
net::structured_headers::ParseList(header);
if (!maybe_list.has_value())
return base::nullopt;
// Standard validation rules: we want a list of tokens, so this better
// only have tokens (but params are OK!)
for (const auto& list_item : maybe_list.value()) {
// Make sure not a nested list.
if (list_item.member.size() != 1u)
return base::nullopt;
if (!list_item.member[0].item.is_token())
return base::nullopt;
}
std::vector<network::mojom::WebClientHintsType> result;
// Now convert those to actual hint enums.
const DecodeMap& decode_map = GetDecodeMap();
for (const auto& list_item : maybe_list.value()) {
const std::string& token_value = list_item.member[0].item.GetString();
auto iter = decode_map.find(token_value);
if (iter != decode_map.end())
result.push_back(iter->second);
} // for list_item
return base::make_optional(std::move(result));
}
base::TimeDelta ParseAcceptCHLifetime(const std::string& header) {
int64_t persist_duration_seconds = 0;
if (!base::StringToInt64(header, &persist_duration_seconds) ||
persist_duration_seconds <= 0)
return base::TimeDelta();
return base::TimeDelta::FromSeconds(persist_duration_seconds);
}
} // namespace network
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