630 lines
18 KiB
JavaScript
630 lines
18 KiB
JavaScript
const assert = require('assert')
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const { atob } = require('buffer')
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const { isomorphicDecode } = require('./util')
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const encoder = new TextEncoder()
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/**
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* @see https://mimesniff.spec.whatwg.org/#http-token-code-point
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*/
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const HTTP_TOKEN_CODEPOINTS = /^[!#$%&'*+-.^_|~A-Za-z0-9]+$/
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const HTTP_WHITESPACE_REGEX = /(\u000A|\u000D|\u0009|\u0020)/ // eslint-disable-line
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/**
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* @see https://mimesniff.spec.whatwg.org/#http-quoted-string-token-code-point
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*/
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const HTTP_QUOTED_STRING_TOKENS = /[\u0009|\u0020-\u007E|\u0080-\u00FF]/ // eslint-disable-line
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// https://fetch.spec.whatwg.org/#data-url-processor
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/** @param {URL} dataURL */
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function dataURLProcessor (dataURL) {
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// 1. Assert: dataURL’s scheme is "data".
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assert(dataURL.protocol === 'data:')
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// 2. Let input be the result of running the URL
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// serializer on dataURL with exclude fragment
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// set to true.
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let input = URLSerializer(dataURL, true)
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// 3. Remove the leading "data:" string from input.
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input = input.slice(5)
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// 4. Let position point at the start of input.
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const position = { position: 0 }
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// 5. Let mimeType be the result of collecting a
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// sequence of code points that are not equal
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// to U+002C (,), given position.
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let mimeType = collectASequenceOfCodePointsFast(
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',',
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input,
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position
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)
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// 6. Strip leading and trailing ASCII whitespace
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// from mimeType.
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// Undici implementation note: we need to store the
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// length because if the mimetype has spaces removed,
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// the wrong amount will be sliced from the input in
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// step #9
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const mimeTypeLength = mimeType.length
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mimeType = removeASCIIWhitespace(mimeType, true, true)
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// 7. If position is past the end of input, then
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// return failure
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if (position.position >= input.length) {
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return 'failure'
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}
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// 8. Advance position by 1.
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position.position++
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// 9. Let encodedBody be the remainder of input.
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const encodedBody = input.slice(mimeTypeLength + 1)
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// 10. Let body be the percent-decoding of encodedBody.
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let body = stringPercentDecode(encodedBody)
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// 11. If mimeType ends with U+003B (;), followed by
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// zero or more U+0020 SPACE, followed by an ASCII
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// case-insensitive match for "base64", then:
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if (/;(\u0020){0,}base64$/i.test(mimeType)) {
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// 1. Let stringBody be the isomorphic decode of body.
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const stringBody = isomorphicDecode(body)
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// 2. Set body to the forgiving-base64 decode of
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// stringBody.
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body = forgivingBase64(stringBody)
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// 3. If body is failure, then return failure.
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if (body === 'failure') {
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return 'failure'
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}
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// 4. Remove the last 6 code points from mimeType.
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mimeType = mimeType.slice(0, -6)
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// 5. Remove trailing U+0020 SPACE code points from mimeType,
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// if any.
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mimeType = mimeType.replace(/(\u0020)+$/, '')
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// 6. Remove the last U+003B (;) code point from mimeType.
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mimeType = mimeType.slice(0, -1)
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}
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// 12. If mimeType starts with U+003B (;), then prepend
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// "text/plain" to mimeType.
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if (mimeType.startsWith(';')) {
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mimeType = 'text/plain' + mimeType
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}
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// 13. Let mimeTypeRecord be the result of parsing
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// mimeType.
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let mimeTypeRecord = parseMIMEType(mimeType)
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// 14. If mimeTypeRecord is failure, then set
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// mimeTypeRecord to text/plain;charset=US-ASCII.
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if (mimeTypeRecord === 'failure') {
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mimeTypeRecord = parseMIMEType('text/plain;charset=US-ASCII')
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}
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// 15. Return a new data: URL struct whose MIME
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// type is mimeTypeRecord and body is body.
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// https://fetch.spec.whatwg.org/#data-url-struct
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return { mimeType: mimeTypeRecord, body }
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}
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// https://url.spec.whatwg.org/#concept-url-serializer
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/**
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* @param {URL} url
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* @param {boolean} excludeFragment
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*/
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function URLSerializer (url, excludeFragment = false) {
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const href = url.href
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if (!excludeFragment) {
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return href
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}
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const hash = href.lastIndexOf('#')
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if (hash === -1) {
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return href
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}
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return href.slice(0, hash)
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}
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// https://infra.spec.whatwg.org/#collect-a-sequence-of-code-points
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/**
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* @param {(char: string) => boolean} condition
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* @param {string} input
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* @param {{ position: number }} position
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*/
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function collectASequenceOfCodePoints (condition, input, position) {
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// 1. Let result be the empty string.
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let result = ''
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// 2. While position doesn’t point past the end of input and the
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// code point at position within input meets the condition condition:
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while (position.position < input.length && condition(input[position.position])) {
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// 1. Append that code point to the end of result.
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result += input[position.position]
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// 2. Advance position by 1.
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position.position++
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}
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// 3. Return result.
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return result
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}
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/**
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* A faster collectASequenceOfCodePoints that only works when comparing a single character.
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* @param {string} char
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* @param {string} input
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* @param {{ position: number }} position
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*/
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function collectASequenceOfCodePointsFast (char, input, position) {
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const idx = input.indexOf(char, position.position)
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const start = position.position
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if (idx === -1) {
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position.position = input.length
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return input.slice(start)
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}
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position.position = idx
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return input.slice(start, position.position)
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}
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// https://url.spec.whatwg.org/#string-percent-decode
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/** @param {string} input */
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function stringPercentDecode (input) {
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// 1. Let bytes be the UTF-8 encoding of input.
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const bytes = encoder.encode(input)
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// 2. Return the percent-decoding of bytes.
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return percentDecode(bytes)
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}
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// https://url.spec.whatwg.org/#percent-decode
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/** @param {Uint8Array} input */
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function percentDecode (input) {
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// 1. Let output be an empty byte sequence.
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/** @type {number[]} */
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const output = []
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// 2. For each byte byte in input:
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for (let i = 0; i < input.length; i++) {
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const byte = input[i]
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// 1. If byte is not 0x25 (%), then append byte to output.
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if (byte !== 0x25) {
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output.push(byte)
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// 2. Otherwise, if byte is 0x25 (%) and the next two bytes
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// after byte in input are not in the ranges
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// 0x30 (0) to 0x39 (9), 0x41 (A) to 0x46 (F),
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// and 0x61 (a) to 0x66 (f), all inclusive, append byte
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// to output.
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} else if (
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byte === 0x25 &&
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!/^[0-9A-Fa-f]{2}$/i.test(String.fromCharCode(input[i + 1], input[i + 2]))
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) {
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output.push(0x25)
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// 3. Otherwise:
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} else {
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// 1. Let bytePoint be the two bytes after byte in input,
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// decoded, and then interpreted as hexadecimal number.
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const nextTwoBytes = String.fromCharCode(input[i + 1], input[i + 2])
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const bytePoint = Number.parseInt(nextTwoBytes, 16)
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// 2. Append a byte whose value is bytePoint to output.
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output.push(bytePoint)
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// 3. Skip the next two bytes in input.
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i += 2
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}
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}
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// 3. Return output.
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return Uint8Array.from(output)
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}
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// https://mimesniff.spec.whatwg.org/#parse-a-mime-type
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/** @param {string} input */
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function parseMIMEType (input) {
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// 1. Remove any leading and trailing HTTP whitespace
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// from input.
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input = removeHTTPWhitespace(input, true, true)
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// 2. Let position be a position variable for input,
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// initially pointing at the start of input.
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const position = { position: 0 }
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// 3. Let type be the result of collecting a sequence
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// of code points that are not U+002F (/) from
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// input, given position.
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const type = collectASequenceOfCodePointsFast(
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'/',
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input,
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position
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)
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// 4. If type is the empty string or does not solely
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// contain HTTP token code points, then return failure.
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// https://mimesniff.spec.whatwg.org/#http-token-code-point
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if (type.length === 0 || !HTTP_TOKEN_CODEPOINTS.test(type)) {
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return 'failure'
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}
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// 5. If position is past the end of input, then return
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// failure
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if (position.position > input.length) {
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return 'failure'
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}
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// 6. Advance position by 1. (This skips past U+002F (/).)
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position.position++
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// 7. Let subtype be the result of collecting a sequence of
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// code points that are not U+003B (;) from input, given
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// position.
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let subtype = collectASequenceOfCodePointsFast(
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';',
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input,
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position
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)
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// 8. Remove any trailing HTTP whitespace from subtype.
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subtype = removeHTTPWhitespace(subtype, false, true)
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// 9. If subtype is the empty string or does not solely
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// contain HTTP token code points, then return failure.
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if (subtype.length === 0 || !HTTP_TOKEN_CODEPOINTS.test(subtype)) {
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return 'failure'
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}
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const typeLowercase = type.toLowerCase()
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const subtypeLowercase = subtype.toLowerCase()
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// 10. Let mimeType be a new MIME type record whose type
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// is type, in ASCII lowercase, and subtype is subtype,
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// in ASCII lowercase.
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// https://mimesniff.spec.whatwg.org/#mime-type
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const mimeType = {
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type: typeLowercase,
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subtype: subtypeLowercase,
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/** @type {Map<string, string>} */
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parameters: new Map(),
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// https://mimesniff.spec.whatwg.org/#mime-type-essence
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essence: `${typeLowercase}/${subtypeLowercase}`
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}
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// 11. While position is not past the end of input:
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while (position.position < input.length) {
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// 1. Advance position by 1. (This skips past U+003B (;).)
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position.position++
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// 2. Collect a sequence of code points that are HTTP
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// whitespace from input given position.
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collectASequenceOfCodePoints(
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// https://fetch.spec.whatwg.org/#http-whitespace
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char => HTTP_WHITESPACE_REGEX.test(char),
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input,
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position
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)
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// 3. Let parameterName be the result of collecting a
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// sequence of code points that are not U+003B (;)
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// or U+003D (=) from input, given position.
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let parameterName = collectASequenceOfCodePoints(
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(char) => char !== ';' && char !== '=',
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input,
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position
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)
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// 4. Set parameterName to parameterName, in ASCII
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// lowercase.
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parameterName = parameterName.toLowerCase()
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// 5. If position is not past the end of input, then:
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if (position.position < input.length) {
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// 1. If the code point at position within input is
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// U+003B (;), then continue.
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if (input[position.position] === ';') {
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continue
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}
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// 2. Advance position by 1. (This skips past U+003D (=).)
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position.position++
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}
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// 6. If position is past the end of input, then break.
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if (position.position > input.length) {
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break
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}
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// 7. Let parameterValue be null.
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let parameterValue = null
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// 8. If the code point at position within input is
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// U+0022 ("), then:
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if (input[position.position] === '"') {
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// 1. Set parameterValue to the result of collecting
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// an HTTP quoted string from input, given position
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// and the extract-value flag.
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parameterValue = collectAnHTTPQuotedString(input, position, true)
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// 2. Collect a sequence of code points that are not
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// U+003B (;) from input, given position.
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collectASequenceOfCodePointsFast(
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';',
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input,
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position
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)
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// 9. Otherwise:
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} else {
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// 1. Set parameterValue to the result of collecting
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// a sequence of code points that are not U+003B (;)
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// from input, given position.
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parameterValue = collectASequenceOfCodePointsFast(
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';',
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input,
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position
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)
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// 2. Remove any trailing HTTP whitespace from parameterValue.
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parameterValue = removeHTTPWhitespace(parameterValue, false, true)
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// 3. If parameterValue is the empty string, then continue.
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if (parameterValue.length === 0) {
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continue
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}
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}
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// 10. If all of the following are true
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// - parameterName is not the empty string
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// - parameterName solely contains HTTP token code points
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// - parameterValue solely contains HTTP quoted-string token code points
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// - mimeType’s parameters[parameterName] does not exist
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// then set mimeType’s parameters[parameterName] to parameterValue.
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if (
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parameterName.length !== 0 &&
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HTTP_TOKEN_CODEPOINTS.test(parameterName) &&
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(parameterValue.length === 0 || HTTP_QUOTED_STRING_TOKENS.test(parameterValue)) &&
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!mimeType.parameters.has(parameterName)
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) {
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mimeType.parameters.set(parameterName, parameterValue)
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}
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}
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// 12. Return mimeType.
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return mimeType
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}
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// https://infra.spec.whatwg.org/#forgiving-base64-decode
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/** @param {string} data */
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function forgivingBase64 (data) {
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// 1. Remove all ASCII whitespace from data.
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data = data.replace(/[\u0009\u000A\u000C\u000D\u0020]/g, '') // eslint-disable-line
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// 2. If data’s code point length divides by 4 leaving
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// no remainder, then:
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if (data.length % 4 === 0) {
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// 1. If data ends with one or two U+003D (=) code points,
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// then remove them from data.
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data = data.replace(/=?=$/, '')
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}
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// 3. If data’s code point length divides by 4 leaving
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// a remainder of 1, then return failure.
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if (data.length % 4 === 1) {
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return 'failure'
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}
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// 4. If data contains a code point that is not one of
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// U+002B (+)
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// U+002F (/)
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// ASCII alphanumeric
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// then return failure.
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if (/[^+/0-9A-Za-z]/.test(data)) {
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return 'failure'
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}
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const binary = atob(data)
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const bytes = new Uint8Array(binary.length)
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for (let byte = 0; byte < binary.length; byte++) {
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bytes[byte] = binary.charCodeAt(byte)
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}
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return bytes
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}
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// https://fetch.spec.whatwg.org/#collect-an-http-quoted-string
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// tests: https://fetch.spec.whatwg.org/#example-http-quoted-string
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/**
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* @param {string} input
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* @param {{ position: number }} position
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* @param {boolean?} extractValue
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*/
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function collectAnHTTPQuotedString (input, position, extractValue) {
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// 1. Let positionStart be position.
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const positionStart = position.position
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// 2. Let value be the empty string.
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let value = ''
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// 3. Assert: the code point at position within input
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// is U+0022 (").
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assert(input[position.position] === '"')
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// 4. Advance position by 1.
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position.position++
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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
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// that are not U+0022 (") or U+005C (\) from input, given
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// position, to value.
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value += collectASequenceOfCodePoints(
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(char) => char !== '"' && char !== '\\',
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input,
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position
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)
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// 2. If position is past the end of input, then break.
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if (position.position >= input.length) {
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break
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}
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// 3. Let quoteOrBackslash be the code point at position within
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// input.
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const quoteOrBackslash = input[position.position]
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// 4. Advance position by 1.
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position.position++
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// 5. If quoteOrBackslash is U+005C (\), then:
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if (quoteOrBackslash === '\\') {
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// 1. If position is past the end of input, then append
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// U+005C (\) to value and break.
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if (position.position >= input.length) {
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value += '\\'
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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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value += input[position.position]
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// 3. Advance position by 1.
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position.position++
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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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assert(quoteOrBackslash === '"')
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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 (extractValue) {
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return value
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}
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// 7. Return the code points from positionStart to position,
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// inclusive, within input.
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return input.slice(positionStart, position.position)
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}
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/**
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* @see https://mimesniff.spec.whatwg.org/#serialize-a-mime-type
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*/
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function serializeAMimeType (mimeType) {
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assert(mimeType !== 'failure')
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const { parameters, essence } = mimeType
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// 1. Let serialization be the concatenation of mimeType’s
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// type, U+002F (/), and mimeType’s subtype.
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let serialization = essence
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|
||
// 2. For each name → value of mimeType’s parameters:
|
||
for (let [name, value] of parameters.entries()) {
|
||
// 1. Append U+003B (;) to serialization.
|
||
serialization += ';'
|
||
|
||
// 2. Append name to serialization.
|
||
serialization += name
|
||
|
||
// 3. Append U+003D (=) to serialization.
|
||
serialization += '='
|
||
|
||
// 4. If value does not solely contain HTTP token code
|
||
// points or value is the empty string, then:
|
||
if (!HTTP_TOKEN_CODEPOINTS.test(value)) {
|
||
// 1. Precede each occurence of U+0022 (") or
|
||
// U+005C (\) in value with U+005C (\).
|
||
value = value.replace(/(\\|")/g, '\\$1')
|
||
|
||
// 2. Prepend U+0022 (") to value.
|
||
value = '"' + value
|
||
|
||
// 3. Append U+0022 (") to value.
|
||
value += '"'
|
||
}
|
||
|
||
// 5. Append value to serialization.
|
||
serialization += value
|
||
}
|
||
|
||
// 3. Return serialization.
|
||
return serialization
|
||
}
|
||
|
||
/**
|
||
* @see https://fetch.spec.whatwg.org/#http-whitespace
|
||
* @param {string} char
|
||
*/
|
||
function isHTTPWhiteSpace (char) {
|
||
return char === '\r' || char === '\n' || char === '\t' || char === ' '
|
||
}
|
||
|
||
/**
|
||
* @see https://fetch.spec.whatwg.org/#http-whitespace
|
||
* @param {string} str
|
||
*/
|
||
function removeHTTPWhitespace (str, leading = true, trailing = true) {
|
||
let lead = 0
|
||
let trail = str.length - 1
|
||
|
||
if (leading) {
|
||
for (; lead < str.length && isHTTPWhiteSpace(str[lead]); lead++);
|
||
}
|
||
|
||
if (trailing) {
|
||
for (; trail > 0 && isHTTPWhiteSpace(str[trail]); trail--);
|
||
}
|
||
|
||
return str.slice(lead, trail + 1)
|
||
}
|
||
|
||
/**
|
||
* @see https://infra.spec.whatwg.org/#ascii-whitespace
|
||
* @param {string} char
|
||
*/
|
||
function isASCIIWhitespace (char) {
|
||
return char === '\r' || char === '\n' || char === '\t' || char === '\f' || char === ' '
|
||
}
|
||
|
||
/**
|
||
* @see https://infra.spec.whatwg.org/#strip-leading-and-trailing-ascii-whitespace
|
||
*/
|
||
function removeASCIIWhitespace (str, leading = true, trailing = true) {
|
||
let lead = 0
|
||
let trail = str.length - 1
|
||
|
||
if (leading) {
|
||
for (; lead < str.length && isASCIIWhitespace(str[lead]); lead++);
|
||
}
|
||
|
||
if (trailing) {
|
||
for (; trail > 0 && isASCIIWhitespace(str[trail]); trail--);
|
||
}
|
||
|
||
return str.slice(lead, trail + 1)
|
||
}
|
||
|
||
module.exports = {
|
||
dataURLProcessor,
|
||
URLSerializer,
|
||
collectASequenceOfCodePoints,
|
||
collectASequenceOfCodePointsFast,
|
||
stringPercentDecode,
|
||
parseMIMEType,
|
||
collectAnHTTPQuotedString,
|
||
serializeAMimeType
|
||
}
|