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LibWeb: Implement the legacy extracting an encoding AO

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Timothy Flynn 2023-05-10 16:26:51 -04:00 committed by Andreas Kling
parent 9701128145
commit 29d90ccf3b
Notes: sideshowbarker 2024-07-17 09:37:30 +09:00 
Author: https://github.com/trflynn89
Commit: https://github.com/SerenityOS/serenity/commit/29d90ccf3b
Pull-request: https://github.com/SerenityOS/serenity/pull/18772
Issue: https://github.com/SerenityOS/serenity/issues/18432
2 changed files with 25 additions and 0 deletions
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24
Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.cpp
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@ -15,6 +15,7 @@
#include <LibJS/Heap/Heap.h>
#include <LibJS/Runtime/VM.h>
#include <LibRegex/Regex.h>
#include <LibTextCodec/Decoder.h>
#include <LibWeb/Fetch/Infrastructure/HTTP.h>
#include <LibWeb/Fetch/Infrastructure/HTTP/Headers.h>
#include <LibWeb/Fetch/Infrastructure/HTTP/Methods.h>
@ -392,6 +393,29 @@ ErrorOr<Optional<MimeSniff::MimeType>> HeaderList::extract_mime_type() const
return mime_type;
}
// https://fetch.spec.whatwg.org/#legacy-extract-an-encoding
StringView legacy_extract_an_encoding(Optional<MimeSniff::MimeType> const& mime_type, StringView fallback_encoding)
{
// 1. If mimeType is failure, then return fallbackEncoding.
if (!mime_type.has_value())
return fallback_encoding;
// 2. If mimeType["charset"] does not exist, then return fallbackEncoding.
auto charset = mime_type->parameters().get("charset"sv);
if (!charset.has_value())
return fallback_encoding;
// 3. Let tentativeEncoding be the result of getting an encoding from mimeType["charset"].
auto tentative_encoding = TextCodec::get_standardized_encoding(*charset);
// 4. If tentativeEncoding is failure, then return fallbackEncoding.
if (!tentative_encoding.has_value())
return fallback_encoding;
// 5. Return tentativeEncoding.
return *tentative_encoding;
}
// https://fetch.spec.whatwg.org/#convert-header-names-to-a-sorted-lowercase-set
ErrorOr<OrderedHashTable<ByteBuffer>> convert_header_names_to_a_sorted_lowercase_set(Span<ReadonlyBytes> header_names)
{

1
Userland/Libraries/LibWeb/Fetch/Infrastructure/HTTP/Headers.h
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@ -70,6 +70,7 @@ struct RangeHeaderValue {
struct ExtractHeaderParseFailure {
};
[[nodiscard]] StringView legacy_extract_an_encoding(Optional<MimeSniff::MimeType> const& mime_type, StringView fallback_encoding);
[[nodiscard]] ErrorOr<Optional<Vector<String>>> get_decode_and_split_header_value(ReadonlyBytes);
[[nodiscard]] ErrorOr<OrderedHashTable<ByteBuffer>> convert_header_names_to_a_sorted_lowercase_set(Span<ReadonlyBytes>);
[[nodiscard]] bool is_header_name(ReadonlyBytes);