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