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9375660b64
The end goal here is for LibHTTP to be the home of our RFC 9111 (HTTP caching) implementation. We currently have one implementation in LibWeb for our in-memory cache and another in RequestServer for our disk cache. The implementations both largely revolve around interacting with HTTP headers. But in LibWeb, we are using Fetch's header infra, and in RS we are using are home-grown header infra from LibHTTP. So to give these a common denominator, this patch replaces the LibHTTP implementation with Fetch's infra. Our existing LibHTTP implementation was not particularly compliant with any spec, so this at least gives us a standards-based common implementation. This migration also required moving a handful of other Fetch AOs over to LibHTTP. (It turns out these AOs were all from the Fetch/Infra/HTTP folder, so perhaps it makes sense for LibHTTP to be the implementation of that entire set of facilities.)
77 lines
2.3 KiB
C++
77 lines
2.3 KiB
C++
/*
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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 <AK/GenericLexer.h>
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#include <AK/StringBuilder.h>
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#include <LibHTTP/HTTP.h>
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namespace HTTP {
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// https://fetch.spec.whatwg.org/#collect-an-http-quoted-string
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String collect_an_http_quoted_string(GenericLexer& lexer, HttpQuotedStringExtractValue extract_value)
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{
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// 1. Let positionStart be position.
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auto position_start = lexer.tell();
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// 2. Let value be the empty string.
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StringBuilder value;
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// 3. Assert: the code point at position within input is U+0022 (").
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VERIFY(lexer.peek() == '"');
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// 4. Advance position by 1.
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lexer.ignore(1);
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// 5. While true:
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while (true) {
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// 1. Append the result of collecting a sequence of code points that are not U+0022 (") or U+005C (\) from
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// input, given position, to value.
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auto value_part = lexer.consume_until([](char ch) {
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return ch == '"' || ch == '\\';
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});
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value.append(value_part);
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// 2. If position is past the end of input, then break.
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if (lexer.is_eof())
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break;
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// 3. Let quoteOrBackslash be the code point at position within input.
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// 4. Advance position by 1.
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char quote_or_backslash = lexer.consume();
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// 5. If quoteOrBackslash is U+005C (\), then:
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if (quote_or_backslash == '\\') {
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// 1. If position is past the end of input, then append U+005C (\) to value and break.
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if (lexer.is_eof()) {
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value.append('\\');
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break;
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}
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// 2. Append the code point at position within input to value.
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// 3. Advance position by 1.
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value.append(lexer.consume());
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}
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// 6. Otherwise:
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else {
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// 1. Assert: quoteOrBackslash is U+0022 (").
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VERIFY(quote_or_backslash == '"');
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// 2. Break.
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break;
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}
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}
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// 6. If the extract-value flag is set, then return value.
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if (extract_value == HttpQuotedStringExtractValue::Yes)
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return MUST(value.to_string());
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// 7. Return the code points from positionStart to position, inclusive, within input.
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return MUST(String::from_utf8(lexer.input().substring_view(position_start, lexer.tell() - position_start)));
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}
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}
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