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https://github.com/LadybirdBrowser/ladybird
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3dce6766a3
An upcoming commit will migrate the contents of Headers.h/cpp to LibHTTP for use outside of LibWeb. These CORS and MIME helpers depend on other LibWeb facilities, however, so they cannot be moved.
94 lines
3.4 KiB
C++
94 lines
3.4 KiB
C++
/*
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* Copyright (c) 2022-2023, Linus Groh <linusg@serenityos.org>
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* Copyright (c) 2022, Kenneth Myhra <kennethmyhra@serenityos.org>
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* Copyright (c) 2022, Luke Wilde <lukew@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 <LibTextCodec/Decoder.h>
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#include <LibWeb/Fetch/Infrastructure/HTTP/Headers.h>
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#include <LibWeb/Fetch/Infrastructure/HTTP/MIME.h>
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namespace Web::Fetch::Infrastructure {
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// https://fetch.spec.whatwg.org/#concept-header-extract-mime-type
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Optional<MimeSniff::MimeType> extract_mime_type(HeaderList const& headers)
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{
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// 1. Let charset be null.
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Optional<String> charset;
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// 2. Let essence be null.
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Optional<String> essence;
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// 3. Let mimeType be null.
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Optional<MimeSniff::MimeType> mime_type;
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// 4. Let values be the result of getting, decoding, and splitting `Content-Type` from headers.
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auto values = headers.get_decode_and_split("Content-Type"sv);
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// 5. If values is null, then return failure.
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if (!values.has_value())
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return {};
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// 6. For each value of values:
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for (auto const& value : *values) {
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// 1. Let temporaryMimeType be the result of parsing value.
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auto temporary_mime_type = MimeSniff::MimeType::parse(value);
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// 2. If temporaryMimeType is failure or its essence is "*/*", then continue.
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if (!temporary_mime_type.has_value() || temporary_mime_type->essence() == "*/*"sv)
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continue;
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// 3. Set mimeType to temporaryMimeType.
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mime_type = temporary_mime_type;
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// 4. If mimeType’s essence is not essence, then:
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if (!essence.has_value() || (mime_type->essence() != *essence)) {
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// 1. Set charset to null.
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charset = {};
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// 2. If mimeType’s parameters["charset"] exists, then set charset to mimeType’s parameters["charset"].
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auto it = mime_type->parameters().find("charset"sv);
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if (it != mime_type->parameters().end())
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charset = it->value;
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// 3. Set essence to mimeType’s essence.
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essence = mime_type->essence();
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}
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// 5. Otherwise, if mimeType’s parameters["charset"] does not exist, and charset is non-null, set mimeType’s parameters["charset"] to charset.
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else if (!mime_type->parameters().contains("charset"sv) && charset.has_value()) {
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mime_type->set_parameter("charset"_string, charset.release_value());
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}
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}
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// 7. If mimeType is null, then return failure.
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// 8. Return mimeType.
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return mime_type;
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}
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// https://fetch.spec.whatwg.org/#legacy-extract-an-encoding
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StringView legacy_extract_an_encoding(Optional<MimeSniff::MimeType> const& mime_type, StringView fallback_encoding)
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{
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// 1. If mimeType is failure, then return fallbackEncoding.
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if (!mime_type.has_value())
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return fallback_encoding;
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// 2. If mimeType["charset"] does not exist, then return fallbackEncoding.
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auto charset = mime_type->parameters().get("charset"sv);
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if (!charset.has_value())
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return fallback_encoding;
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// 3. Let tentativeEncoding be the result of getting an encoding from mimeType["charset"].
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auto tentative_encoding = TextCodec::get_standardized_encoding(*charset);
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// 4. If tentativeEncoding is failure, then return fallbackEncoding.
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if (!tentative_encoding.has_value())
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return fallback_encoding;
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// 5. Return tentativeEncoding.
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return *tentative_encoding;
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}
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}
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