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86 lines
3.7 KiB
C++
86 lines
3.7 KiB
C++
/*
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* Copyright (c) 2022-2023, 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/Fetching/Checks.h>
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#include <LibWeb/Fetch/Infrastructure/HTTP/Requests.h>
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#include <LibWeb/Fetch/Infrastructure/HTTP/Responses.h>
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#include <LibWeb/URL/URL.h>
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namespace Web::Fetch::Fetching {
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// https://fetch.spec.whatwg.org/#concept-cors-check
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ErrorOr<bool> cors_check(Infrastructure::Request const& request, Infrastructure::Response const& response)
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{
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// 1. Let origin be the result of getting `Access-Control-Allow-Origin` from response’s header list.
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auto origin = TRY(response.header_list()->get("Access-Control-Allow-Origin"sv.bytes()));
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// 2. If origin is null, then return failure.
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// NOTE: Null is not `null`.
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if (!origin.has_value())
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return false;
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// 3. If request’s credentials mode is not "include" and origin is `*`, then return success.
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if (request.credentials_mode() != Infrastructure::Request::CredentialsMode::Include && origin->span() == "*"sv.bytes())
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return true;
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// 4. If the result of byte-serializing a request origin with request is not origin, then return failure.
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if (TRY(request.byte_serialize_origin()) != *origin)
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return false;
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// 5. If request’s credentials mode is not "include", then return success.
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if (request.credentials_mode() != Infrastructure::Request::CredentialsMode::Include)
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return true;
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// 6. Let credentials be the result of getting `Access-Control-Allow-Credentials` from response’s header list.
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auto credentials = TRY(response.header_list()->get("Access-Control-Allow-Credentials"sv.bytes()));
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// 7. If credentials is `true`, then return success.
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if (credentials.has_value() && credentials->span() == "true"sv.bytes())
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return true;
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// 8. Return failure.
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return false;
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}
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// https://fetch.spec.whatwg.org/#concept-tao-check
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ErrorOr<bool> tao_check(Infrastructure::Request const& request, Infrastructure::Response const& response)
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{
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// 1. If request’s timing allow failed flag is set, then return failure.
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if (request.timing_allow_failed())
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return false;
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// 2. Let values be the result of getting, decoding, and splitting `Timing-Allow-Origin` from response’s header list.
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auto values = TRY(response.header_list()->get_decode_and_split("Timing-Allow-Origin"sv.bytes()));
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// 3. If values contains "*", then return success.
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if (values.has_value() && values->contains_slow("*"_short_string))
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return true;
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// 4. If values contains the result of serializing a request origin with request, then return success.
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if (values.has_value() && values->contains_slow(TRY(request.serialize_origin())))
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return true;
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// 5. If request’s mode is "navigate" and request’s current URL’s origin is not same origin with request’s origin, then return failure.
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// NOTE: This is necessary for navigations of a nested browsing context. There, request’s origin would be the
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// container document’s origin and the TAO check would return failure. Since navigation timing never
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// validates the results of the TAO check, the nested document would still have access to the full timing
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// information, but the container document would not.
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if (request.mode() == Infrastructure::Request::Mode::Navigate
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&& request.origin().has<HTML::Origin>()
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&& !URL::url_origin(request.current_url()).is_same_origin(request.origin().get<HTML::Origin>())) {
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return false;
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}
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// 6. If request’s response tainting is "basic", then return success.
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if (request.response_tainting() == Infrastructure::Request::ResponseTainting::Basic)
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return true;
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// 7. Return failure.
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return false;
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}
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}
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