mirror of
https://github.com/RGBCube/serenity
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58 lines
2.4 KiB
C++
58 lines
2.4 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/Infrastructure/HTTP/Headers.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/Fetch/Infrastructure/NoSniffBlocking.h>
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#include <LibWeb/Infra/Strings.h>
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namespace Web::Fetch::Infrastructure {
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// https://fetch.spec.whatwg.org/#determine-nosniff
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ErrorOr<bool> determine_nosniff(HeaderList const& list)
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{
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// 1. Let values be the result of getting, decoding, and splitting `X-Content-Type-Options` from list.
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auto values = TRY(list.get_decode_and_split("X-Content-Type-Options"sv.bytes()));
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// 2. If values is null, then return false.
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if (!values.has_value())
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return false;
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// 3. If values[0] is an ASCII case-insensitive match for "nosniff", then return true.
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if (!values->is_empty() && Infra::is_ascii_case_insensitive_match(values->at(0), "nosniff"sv))
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return true;
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// 4. Return false.
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return false;
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}
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// https://fetch.spec.whatwg.org/#should-response-to-request-be-blocked-due-to-nosniff?
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ErrorOr<RequestOrResponseBlocking> should_response_to_request_be_blocked_due_to_nosniff(Response const& response, Request const& request)
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{
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// 1. If determine nosniff with response’s header list is false, then return allowed.
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if (!TRY(determine_nosniff(response.header_list())))
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return RequestOrResponseBlocking::Allowed;
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// 2. Let mimeType be the result of extracting a MIME type from response’s header list.
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auto mime_type = TRY(response.header_list()->extract_mime_type());
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// 3. Let destination be request’s destination.
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auto const& destination = request.destination();
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// 4. If destination is script-like and mimeType is failure or is not a JavaScript MIME type, then return blocked.
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if (request.destination_is_script_like() && (!mime_type.has_value() || !mime_type->is_javascript()))
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return RequestOrResponseBlocking::Blocked;
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// 5. If destination is "style" and mimeType is failure or its essence is not "text/css", then return blocked.
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if (destination == Request::Destination::Style && (!mime_type.has_value() || mime_type->essence() != "text/css"sv))
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return RequestOrResponseBlocking::Blocked;
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// 6. Return allowed.
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return RequestOrResponseBlocking::Allowed;
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}
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}
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