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// Copyright 2021 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 "quiche_platform_impl/quiche_url_utils_impl.h"
#include <cstddef>
#include <cstdint>
#include <limits>
#include <optional>
#include <string>
#include "quiche_platform_impl/quiche_googleurl_impl.h"
#include "absl/container/flat_hash_map.h"
#include "absl/container/flat_hash_set.h"
#include "absl/strings/str_cat.h"
#include "absl/strings/str_replace.h"
#include "absl/strings/string_view.h"
namespace quiche {
bool ExpandURITemplateImpl(
const std::string& uri_template,
const absl::flat_hash_map<std::string, std::string>& parameters,
std::string* target, absl::flat_hash_set<std::string>* vars_found) {
absl::flat_hash_set<std::string> found;
std::string result = uri_template;
for (const auto& pair : parameters) {
const std::string& name = pair.first;
const std::string& value = pair.second;
std::string name_input = absl::StrCat("{", name, "}");
url::RawCanonOutputT<char> canon_value;
url::EncodeURIComponent(value.c_str(), value.length(), &canon_value);
std::string encoded_value(canon_value.data(), canon_value.length());
int num_replaced =
absl::StrReplaceAll({{name_input, encoded_value}}, &result);
if (num_replaced > 0) {
found.insert(name);
}
}
// Remove any remaining variables that were not present in |parameters|.
while (true) {
size_t start = result.find('{');
if (start == std::string::npos) {
break;
}
size_t end = result.find('}');
if (end == std::string::npos || end <= start) {
return false;
}
result.erase(start, (end - start) + 1);
}
if (vars_found != nullptr) {
*vars_found = found;
}
*target = result;
return true;
}
std::optional<std::string> AsciiUrlDecodeImpl(absl::string_view input) {
std::string input_encoded = std::string(input);
url::RawCanonOutputW<1024> canon_output;
url::DecodeURLEscapeSequences(input_encoded.c_str(), input_encoded.length(),
url::DecodeURLMode::kUTF8,
&canon_output);
std::string output;
output.reserve(canon_output.length());
for (int i = 0; i < canon_output.length(); i++) {
const uint16_t c = reinterpret_cast<uint16_t*>(canon_output.data())[i];
if (c > std::numeric_limits<signed char>::max()) {
return std::nullopt;
}
output += static_cast<char>(c);
}
return output;
}
} // namespace quiche