content/browser/preloading/prefetch/no_vary_search_helper.cc

// Copyright 2022 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "content/browser/preloading/prefetch/no_vary_search_helper.h"

#include "content/public/browser/render_frame_host.h"
#include "services/network/public/cpp/no_vary_search_header_parser.h"
#include "services/network/public/mojom/url_response_head.mojom.h"
#include "third_party/blink/public/mojom/devtools/console_message.mojom-shared.h"

namespace content {

namespace no_vary_search {

// static
net::HttpNoVarySearchData ParseHttpNoVarySearchDataFromMojom(
    const network::mojom::NoVarySearchPtr& no_vary_search_ptr) {
  if (no_vary_search_ptr->search_variance->is_vary_params()) {
    return net::HttpNoVarySearchData::CreateFromVaryParams(
        no_vary_search_ptr->search_variance->get_vary_params(),
        no_vary_search_ptr->vary_on_key_order);
  }
  return net::HttpNoVarySearchData::CreateFromNoVaryParams(
      no_vary_search_ptr->search_variance->get_no_vary_params(),
      no_vary_search_ptr->vary_on_key_order);
}

std::optional<net::HttpNoVarySearchData> ProcessHead(
    const network::mojom::URLResponseHead& head,
    const GURL& url,
    RenderFrameHost* rfh) {
  // No No-Vary-Search headers.
  if (!(head.parsed_headers &&
        head.parsed_headers->no_vary_search_with_parse_error)) {
    return std::nullopt;
  }

  // Success.
  if (!head.parsed_headers->no_vary_search_with_parse_error->is_parse_error()) {
    return ParseHttpNoVarySearchDataFromMojom(
        head.parsed_headers->no_vary_search_with_parse_error
            ->get_no_vary_search());
  }

  // Parse error.
  const auto parse_error =
      head.parsed_headers->no_vary_search_with_parse_error->get_parse_error();
  // TODO(crbug.com/40286370): Maybe `CHECK_NE(parse_error, kOk)`.
  if (parse_error == network::mojom::NoVarySearchParseError::kOk) {
    return std::nullopt;
  }
  blink::mojom::ConsoleMessageLevel error_level =
      parse_error == network::mojom::NoVarySearchParseError::kDefaultValue
          ? blink::mojom::ConsoleMessageLevel::kWarning
          : blink::mojom::ConsoleMessageLevel::kError;
  auto error_message = network::GetNoVarySearchConsoleMessage(parse_error, url);
  CHECK(error_message);
  if (rfh) {
    rfh->AddMessageToConsole(error_level, error_message.value());
  }
  return std::nullopt;
}

}  // namespace no_vary_search

}  // namespace content