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LibWeb: Add definitions from '2.2.6. Responses' in the Fetch spec
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/*
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* Copyright (c) 2022, Linus Groh <linusg@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/Fetch/Infrastructure/HTTP/Responses.h>
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namespace Web::Fetch {
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// https://fetch.spec.whatwg.org/#ref-for-concept-network-error%E2%91%A3
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// A network error is a response whose status is always 0, status message is always
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// the empty byte sequence, header list is always empty, and body is always null.
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Response Response::aborted_network_error()
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{
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auto response = network_error();
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response.set_aborted(true);
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return response;
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}
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Response Response::network_error()
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{
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Response response;
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response.set_status(0);
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response.set_type(Type::Error);
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VERIFY(!response.body().has_value());
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return response;
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}
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// https://fetch.spec.whatwg.org/#concept-aborted-network-error
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bool Response::is_aborted_network_error() const
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{
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// A response whose type is "error" and aborted flag is set is known as an aborted network error.
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return m_type == Type::Error && m_aborted;
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}
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// https://fetch.spec.whatwg.org/#concept-network-error
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bool Response::is_network_error() const
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{
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// A response whose type is "error" is known as a network error.
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return m_type == Type::Error;
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}
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// https://fetch.spec.whatwg.org/#concept-response-url
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Optional<AK::URL const&> Response::url() const
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{
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// A response has an associated URL. It is a pointer to the last URL in response’s URL list and null if response’s URL list is empty.
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if (m_url_list.is_empty())
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return {};
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return m_url_list.last();
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}
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// https://fetch.spec.whatwg.org/#concept-response-location-url
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ErrorOr<Optional<AK::URL>> Response::location_url(Optional<String> const& request_fragment) const
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{
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// The location URL of a response response, given null or an ASCII string requestFragment, is the value returned by the following steps. They return null, failure, or a URL.
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// 1. If response’s status is not a redirect status, then return null.
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if (!is_redirect_status(m_status))
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return Optional<AK::URL> {};
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// FIXME: 2. Let location be the result of extracting header list values given `Location` and response’s header list.
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auto location_value = ByteBuffer {};
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// 3. If location is a header value, then set location to the result of parsing location with response’s URL.
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auto location = AK::URL { StringView { location_value } };
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if (!location.is_valid())
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return Error::from_string_view("Invalid 'Location' header URL"sv);
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// 4. If location is a URL whose fragment is null, then set location’s fragment to requestFragment.
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if (location.fragment().is_null())
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location.set_fragment(request_fragment.value_or({}));
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// 5. Return location.
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return location;
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}
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FilteredResponse::FilteredResponse(Response& internal_response)
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: m_internal_response(internal_response)
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{
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}
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FilteredResponse::~FilteredResponse()
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{
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}
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ErrorOr<BasicFilteredResponse> BasicFilteredResponse::create(Response& internal_response)
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{
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// A basic filtered response is a filtered response whose type is "basic" and header list excludes
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// any headers in internal response’s header list whose name is a forbidden response-header name.
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HeaderList header_list;
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for (auto const& header : internal_response.header_list()) {
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if (!is_forbidden_response_header_name(header.name))
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TRY(header_list.append(header));
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}
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return BasicFilteredResponse(internal_response, move(header_list));
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}
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BasicFilteredResponse::BasicFilteredResponse(Response& internal_response, HeaderList header_list)
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: FilteredResponse(internal_response)
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, m_header_list(move(header_list))
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{
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}
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ErrorOr<CORSFilteredResponse> CORSFilteredResponse::create(Response& internal_response)
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{
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// A CORS filtered response is a filtered response whose type is "cors" and header list excludes
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// any headers in internal response’s header list whose name is not a CORS-safelisted response-header
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// name, given internal response’s CORS-exposed header-name list.
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Vector<ReadonlyBytes> cors_exposed_header_name_list;
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for (auto const& header_name : internal_response.cors_exposed_header_name_list())
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cors_exposed_header_name_list.append(header_name.span());
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HeaderList header_list;
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for (auto const& header : internal_response.header_list()) {
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if (is_cors_safelisted_response_header_name(header.name, cors_exposed_header_name_list))
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TRY(header_list.append(header));
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}
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return CORSFilteredResponse(internal_response, move(header_list));
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}
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CORSFilteredResponse::CORSFilteredResponse(Response& internal_response, HeaderList header_list)
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: FilteredResponse(internal_response)
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, m_header_list(move(header_list))
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{
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}
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OpaqueFilteredResponse OpaqueFilteredResponse::create(Response& internal_response)
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{
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// An opaque-redirect filtered response is a filtered response whose type is "opaqueredirect",
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// status is 0, status message is the empty byte sequence, header list is empty, and body is null.
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return OpaqueFilteredResponse(internal_response);
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}
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OpaqueFilteredResponse::OpaqueFilteredResponse(Response& internal_response)
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: FilteredResponse(internal_response)
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{
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}
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OpaqueRedirectFilteredResponse OpaqueRedirectFilteredResponse::create(Response& internal_response)
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{
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return OpaqueRedirectFilteredResponse(internal_response);
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}
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OpaqueRedirectFilteredResponse::OpaqueRedirectFilteredResponse(Response& internal_response)
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: FilteredResponse(internal_response)
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{
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}
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}
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