mirror of
https://github.com/denoland/deno
synced 2024-08-25 11:07:24 +00:00
212 lines
5 KiB
JavaScript
212 lines
5 KiB
JavaScript
// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
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// @ts-check
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/// <reference path="../../core/internal.d.ts" />
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/// <reference path="../../core/lib.deno_core.d.ts" />
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/// <reference path="../web/internal.d.ts" />
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/// <reference path="../web/lib.deno_web.d.ts" />
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"use strict";
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((window) => {
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const {
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ArrayPrototypeIncludes,
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Map,
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MapPrototypeHas,
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MapPrototypeSet,
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RegExpPrototypeTest,
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StringPrototypeReplaceAll,
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StringPrototypeToLowerCase,
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} = window.__bootstrap.primordials;
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const {
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collectSequenceOfCodepoints,
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HTTP_WHITESPACE,
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HTTP_WHITESPACE_PREFIX_RE,
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HTTP_WHITESPACE_SUFFIX_RE,
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HTTP_QUOTED_STRING_TOKEN_POINT_RE,
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HTTP_TOKEN_CODE_POINT_RE,
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collectHttpQuotedString,
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} = window.__bootstrap.infra;
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/**
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* @typedef MimeType
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* @property {string} type
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* @property {string} subtype
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* @property {Map<string,string>} parameters
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*/
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/**
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* @param {string} input
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* @returns {MimeType | null}
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*/
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function parseMimeType(input) {
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// 1.
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input = StringPrototypeReplaceAll(input, HTTP_WHITESPACE_PREFIX_RE, "");
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input = StringPrototypeReplaceAll(input, HTTP_WHITESPACE_SUFFIX_RE, "");
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// 2.
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let position = 0;
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const endOfInput = input.length;
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// 3.
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const res1 = collectSequenceOfCodepoints(
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input,
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position,
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(c) => c != "\u002F",
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);
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const type = res1.result;
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position = res1.position;
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// 4.
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if (type === "" || !RegExpPrototypeTest(HTTP_TOKEN_CODE_POINT_RE, type)) {
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return null;
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}
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// 5.
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if (position >= endOfInput) return null;
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// 6.
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position++;
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// 7.
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const res2 = collectSequenceOfCodepoints(
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input,
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position,
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(c) => c != "\u003B",
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);
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let subtype = res2.result;
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position = res2.position;
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// 8.
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subtype = StringPrototypeReplaceAll(subtype, HTTP_WHITESPACE_SUFFIX_RE, "");
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// 9.
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if (
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subtype === "" || !RegExpPrototypeTest(HTTP_TOKEN_CODE_POINT_RE, subtype)
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) {
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return null;
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}
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// 10.
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const mimeType = {
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type: StringPrototypeToLowerCase(type),
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subtype: StringPrototypeToLowerCase(subtype),
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/** @type {Map<string, string>} */
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parameters: new Map(),
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};
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// 11.
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while (position < endOfInput) {
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// 11.1.
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position++;
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// 11.2.
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const res1 = collectSequenceOfCodepoints(
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input,
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position,
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(c) => ArrayPrototypeIncludes(HTTP_WHITESPACE, c),
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);
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position = res1.position;
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// 11.3.
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const res2 = collectSequenceOfCodepoints(
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input,
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position,
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(c) => c !== "\u003B" && c !== "\u003D",
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);
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let parameterName = res2.result;
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position = res2.position;
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// 11.4.
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parameterName = StringPrototypeToLowerCase(parameterName);
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// 11.5.
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if (position < endOfInput) {
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if (input[position] == "\u003B") continue;
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position++;
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}
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// 11.6.
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if (position >= endOfInput) break;
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// 11.7.
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let parameterValue = null;
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// 11.8.
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if (input[position] === "\u0022") {
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// 11.8.1.
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const res = collectHttpQuotedString(input, position, true);
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parameterValue = res.result;
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position = res.position;
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// 11.8.2.
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position++;
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} else { // 11.9.
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// 11.9.1.
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const res = collectSequenceOfCodepoints(
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input,
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position,
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(c) => c !== "\u003B",
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);
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parameterValue = res.result;
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position = res.position;
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// 11.9.2.
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parameterValue = StringPrototypeReplaceAll(
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parameterValue,
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HTTP_WHITESPACE_SUFFIX_RE,
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"",
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);
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// 11.9.3.
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if (parameterValue === "") continue;
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}
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// 11.10.
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if (
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parameterName !== "" &&
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RegExpPrototypeTest(HTTP_TOKEN_CODE_POINT_RE, parameterName) &&
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RegExpPrototypeTest(
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HTTP_QUOTED_STRING_TOKEN_POINT_RE,
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parameterValue,
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) &&
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!MapPrototypeHas(mimeType.parameters, parameterName)
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) {
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MapPrototypeSet(mimeType.parameters, parameterName, parameterValue);
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}
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}
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// 12.
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return mimeType;
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}
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/**
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* @param {MimeType} mimeType
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* @returns {string}
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*/
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function essence(mimeType) {
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return `${mimeType.type}/${mimeType.subtype}`;
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}
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/**
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* @param {MimeType} mimeType
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* @returns {string}
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*/
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function serializeMimeType(mimeType) {
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let serialization = essence(mimeType);
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for (const param of mimeType.parameters) {
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serialization += `;${param[0]}=`;
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let value = param[1];
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if (!RegExpPrototypeTest(HTTP_TOKEN_CODE_POINT_RE, value)) {
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value = StringPrototypeReplaceAll(value, "\\", "\\\\");
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value = StringPrototypeReplaceAll(value, '"', '\\"');
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value = `"${value}"`;
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}
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serialization += value;
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}
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return serialization;
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}
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window.__bootstrap.mimesniff = { parseMimeType, essence, serializeMimeType };
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})(this);
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