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449 lines
10 KiB
JavaScript
449 lines
10 KiB
JavaScript
// Copyright 2018-2024 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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import { primordials } from "ext:core/mod.js";
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const {
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ArrayPrototypeIncludes,
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MapPrototypeGet,
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MapPrototypeHas,
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MapPrototypeSet,
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RegExpPrototypeTest,
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RegExpPrototypeExec,
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SafeMap,
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SafeMapIterator,
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StringPrototypeReplaceAll,
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StringPrototypeToLowerCase,
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StringPrototypeEndsWith,
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Uint8Array,
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TypedArrayPrototypeGetLength,
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TypedArrayPrototypeIncludes,
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} = primordials;
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import {
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assert,
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collectHttpQuotedString,
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collectSequenceOfCodepoints,
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HTTP_QUOTED_STRING_TOKEN_POINT_RE,
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HTTP_TOKEN_CODE_POINT_RE,
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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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} from "ext:deno_web/00_infra.js";
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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 SafeMap(),
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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 new SafeMapIterator(mimeType.parameters)) {
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serialization += `;${param[0]}=`;
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let value = param[1];
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if (RegExpPrototypeExec(HTTP_TOKEN_CODE_POINT_RE, value) === null) {
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value = StringPrototypeReplaceAll(value, "\\", "\\\\");
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value = StringPrototypeReplaceAll(value, '"', '\\"');
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value = `"${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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/**
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* Part of the Fetch spec's "extract a MIME type" algorithm
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* (https://fetch.spec.whatwg.org/#concept-header-extract-mime-type).
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* @param {string[] | null} headerValues The result of getting, decoding and
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* splitting the "Content-Type" header.
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* @returns {MimeType | null}
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*/
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function extractMimeType(headerValues) {
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if (headerValues === null) return null;
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let charset = null;
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let essence_ = null;
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let mimeType = null;
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for (let i = 0; i < headerValues.length; ++i) {
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const value = headerValues[i];
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const temporaryMimeType = parseMimeType(value);
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if (
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temporaryMimeType === null ||
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essence(temporaryMimeType) == "*/*"
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) {
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continue;
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}
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mimeType = temporaryMimeType;
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if (essence(mimeType) !== essence_) {
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charset = null;
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const newCharset = MapPrototypeGet(mimeType.parameters, "charset");
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if (newCharset !== undefined) {
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charset = newCharset;
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}
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essence_ = essence(mimeType);
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} else {
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if (
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!MapPrototypeHas(mimeType.parameters, "charset") &&
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charset !== null
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) {
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MapPrototypeSet(mimeType.parameters, "charset", charset);
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}
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}
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}
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return mimeType;
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}
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/**
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* Ref: https://mimesniff.spec.whatwg.org/#xml-mime-type
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* @param {MimeType} mimeType
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* @returns {boolean}
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*/
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function isXML(mimeType) {
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return StringPrototypeEndsWith(mimeType.subtype, "+xml") ||
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essence(mimeType) === "text/xml" || essence(mimeType) === "application/xml";
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}
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/**
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* Ref: https://mimesniff.spec.whatwg.org/#pattern-matching-algorithm
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* @param {Uint8Array} input
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* @param {Uint8Array} pattern
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* @param {Uint8Array} mask
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* @param {Uint8Array} ignored
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* @returns {boolean}
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*/
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function patternMatchingAlgorithm(input, pattern, mask, ignored) {
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assert(
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TypedArrayPrototypeGetLength(pattern) ===
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TypedArrayPrototypeGetLength(mask),
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);
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if (
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TypedArrayPrototypeGetLength(input) < TypedArrayPrototypeGetLength(pattern)
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) {
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return false;
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}
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let s = 0;
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for (; s < TypedArrayPrototypeGetLength(input); s++) {
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if (!TypedArrayPrototypeIncludes(ignored, input[s])) {
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break;
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}
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}
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let p = 0;
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for (; p < TypedArrayPrototypeGetLength(pattern); p++, s++) {
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const maskedData = input[s] & mask[p];
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if (maskedData !== pattern[p]) {
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return false;
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}
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}
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return true;
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}
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const ImageTypePatternTable = [
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// A Windows Icon signature.
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[
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new Uint8Array([0x00, 0x00, 0x01, 0x00]),
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new Uint8Array([0xFF, 0xFF, 0xFF, 0xFF]),
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new Uint8Array(),
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"image/x-icon",
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],
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// A Windows Cursor signature.
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[
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new Uint8Array([0x00, 0x00, 0x02, 0x00]),
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new Uint8Array([0xFF, 0xFF, 0xFF, 0xFF]),
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new Uint8Array(),
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"image/x-icon",
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],
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// The string "BM", a BMP signature.
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[
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new Uint8Array([0x42, 0x4D]),
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new Uint8Array([0xFF, 0xFF]),
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new Uint8Array(),
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"image/bmp",
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],
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// The string "GIF87a", a GIF signature.
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[
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new Uint8Array([0x47, 0x49, 0x46, 0x38, 0x37, 0x61]),
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new Uint8Array([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]),
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new Uint8Array(),
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"image/gif",
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],
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// The string "GIF89a", a GIF signature.
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[
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new Uint8Array([0x47, 0x49, 0x46, 0x38, 0x39, 0x61]),
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new Uint8Array([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]),
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new Uint8Array(),
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"image/gif",
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],
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// The string "RIFF" followed by four bytes followed by the string "WEBPVP".
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[
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new Uint8Array([
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0x52,
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0x49,
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0x46,
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0x46,
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0x00,
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0x00,
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0x00,
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0x00,
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0x57,
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0x45,
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0x42,
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0x50,
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0x56,
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0x50,
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]),
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new Uint8Array([
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0x00,
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0x00,
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0x00,
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0x00,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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0xFF,
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]),
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new Uint8Array(),
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"image/webp",
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],
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// An error-checking byte followed by the string "PNG" followed by CR LF SUB LF, the PNG signature.
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[
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new Uint8Array([0x89, 0x50, 0x4E, 0x47, 0x0D, 0x0A, 0x1A, 0x0A]),
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new Uint8Array([0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF]),
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new Uint8Array(),
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"image/png",
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],
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// The JPEG Start of Image marker followed by the indicator byte of another marker.
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[
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new Uint8Array([0xFF, 0xD8, 0xFF]),
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new Uint8Array([0xFF, 0xFF, 0xFF]),
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new Uint8Array(),
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"image/jpeg",
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],
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];
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/**
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* Ref: https://mimesniff.spec.whatwg.org/#image-type-pattern-matching-algorithm
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* @param {Uint8Array} input
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* @returns {string | undefined}
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*/
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function imageTypePatternMatchingAlgorithm(input) {
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for (let i = 0; i < ImageTypePatternTable.length; i++) {
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const row = ImageTypePatternTable[i];
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const patternMatched = patternMatchingAlgorithm(
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input,
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row[0],
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row[1],
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row[2],
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);
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if (patternMatched) {
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return row[3];
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}
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}
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return undefined;
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}
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/**
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* Ref: https://mimesniff.spec.whatwg.org/#rules-for-sniffing-images-specifically
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* @param {string} mimeTypeString
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* @returns {string}
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*/
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function sniffImage(mimeTypeString) {
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const mimeType = parseMimeType(mimeTypeString);
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if (mimeType === null) {
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return mimeTypeString;
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}
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if (isXML(mimeType)) {
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return mimeTypeString;
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}
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const imageTypeMatched = imageTypePatternMatchingAlgorithm(
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new TextEncoder().encode(mimeTypeString),
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);
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if (imageTypeMatched !== undefined) {
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return imageTypeMatched;
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}
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return mimeTypeString;
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}
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export {
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essence,
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extractMimeType,
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parseMimeType,
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serializeMimeType,
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sniffImage,
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};
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