1 files changed, 575 insertions, 0 deletions
diff --git a/vanilla/node_modules/undici/lib/web/fetch/formdata-parser.js b/vanilla/node_modules/undici/lib/web/fetch/formdata-parser.js
new file mode 100644
index 0000000..4ba204c
--- /dev/null
+++ b/vanilla/node_modules/undici/lib/web/fetch/formdata-parser.js
@@ -0,0 +1,575 @@
+'use strict'
+
+const { bufferToLowerCasedHeaderName } = require('../../core/util')
+const { HTTP_TOKEN_CODEPOINTS } = require('./data-url')
+const { makeEntry } = require('./formdata')
+const { webidl } = require('../webidl')
+const assert = require('node:assert')
+const { isomorphicDecode } = require('../infra')
+const { utf8DecodeBytes } = require('../../encoding')
+
+const dd = Buffer.from('--')
+const decoder = new TextDecoder()
+
+/**
+ * @param {string} chars
+ */
+function isAsciiString (chars) {
+  for (let i = 0; i < chars.length; ++i) {
+    if ((chars.charCodeAt(i) & ~0x7F) !== 0) {
+      return false
+    }
+  }
+  return true
+}
+
+/**
+ * @see https://andreubotella.github.io/multipart-form-data/#multipart-form-data-boundary
+ * @param {string} boundary
+ */
+function validateBoundary (boundary) {
+  const length = boundary.length
+
+  // - its length is greater or equal to 27 and lesser or equal to 70, and
+  if (length < 27 || length > 70) {
+    return false
+  }
+
+  // - it is composed by bytes in the ranges 0x30 to 0x39, 0x41 to 0x5A, or
+  //   0x61 to 0x7A, inclusive (ASCII alphanumeric), or which are 0x27 ('),
+  //   0x2D (-) or 0x5F (_).
+  for (let i = 0; i < length; ++i) {
+    const cp = boundary.charCodeAt(i)
+
+    if (!(
+      (cp >= 0x30 && cp <= 0x39) ||
+      (cp >= 0x41 && cp <= 0x5a) ||
+      (cp >= 0x61 && cp <= 0x7a) ||
+      cp === 0x27 ||
+      cp === 0x2d ||
+      cp === 0x5f
+    )) {
+      return false
+    }
+  }
+
+  return true
+}
+
+/**
+ * @see https://andreubotella.github.io/multipart-form-data/#multipart-form-data-parser
+ * @param {Buffer} input
+ * @param {ReturnType<import('./data-url')['parseMIMEType']>} mimeType
+ */
+function multipartFormDataParser (input, mimeType) {
+  // 1. Assert: mimeType’s essence is "multipart/form-data".
+  assert(mimeType !== 'failure' && mimeType.essence === 'multipart/form-data')
+
+  const boundaryString = mimeType.parameters.get('boundary')
+
+  // 2. If mimeType’s parameters["boundary"] does not exist, return failure.
+  //    Otherwise, let boundary be the result of UTF-8 decoding mimeType’s
+  //    parameters["boundary"].
+  if (boundaryString === undefined) {
+    throw parsingError('missing boundary in content-type header')
+  }
+
+  const boundary = Buffer.from(`--${boundaryString}`, 'utf8')
+
+  // 3. Let entry list be an empty entry list.
+  const entryList = []
+
+  // 4. Let position be a pointer to a byte in input, initially pointing at
+  //    the first byte.
+  const position = { position: 0 }
+
+  // Note: Per RFC 2046 Section 5.1.1, we must ignore anything before the
+  // first boundary delimiter line (preamble). Search for the first boundary.
+  const firstBoundaryIndex = input.indexOf(boundary)
+
+  if (firstBoundaryIndex === -1) {
+    throw parsingError('no boundary found in multipart body')
+  }
+
+  // Start parsing from the first boundary, ignoring any preamble
+  position.position = firstBoundaryIndex
+
+  // 5. While true:
+  while (true) {
+    // 5.1. If position points to a sequence of bytes starting with 0x2D 0x2D
+    //      (`--`) followed by boundary, advance position by 2 + the length of
+    //      boundary. Otherwise, return failure.
+    // Note: boundary is padded with 2 dashes already, no need to add 2.
+    if (input.subarray(position.position, position.position + boundary.length).equals(boundary)) {
+      position.position += boundary.length
+    } else {
+      throw parsingError('expected a value starting with -- and the boundary')
+    }
+
+    // 5.2. If position points to the sequence of bytes 0x2D 0x2D 0x0D 0x0A
+    //      (`--` followed by CR LF) followed by the end of input, return entry list.
+    // Note: Per RFC 2046 Section 5.1.1, we must ignore anything after the
+    // final boundary delimiter (epilogue). Check for -- or --CRLF and return
+    // regardless of what follows.
+    if (bufferStartsWith(input, dd, position)) {
+      // Found closing boundary delimiter (--), ignore any epilogue
+      return entryList
+    }
+
+    // 5.3. If position does not point to a sequence of bytes starting with 0x0D
+    //      0x0A (CR LF), return failure.
+    if (input[position.position] !== 0x0d || input[position.position + 1] !== 0x0a) {
+      throw parsingError('expected CRLF')
+    }
+
+    // 5.4. Advance position by 2. (This skips past the newline.)
+    position.position += 2
+
+    // 5.5. Let name, filename and contentType be the result of parsing
+    //      multipart/form-data headers on input and position, if the result
+    //      is not failure. Otherwise, return failure.
+    const result = parseMultipartFormDataHeaders(input, position)
+
+    let { name, filename, contentType, encoding } = result
+
+    // 5.6. Advance position by 2. (This skips past the empty line that marks
+    //      the end of the headers.)
+    position.position += 2
+
+    // 5.7. Let body be the empty byte sequence.
+    let body
+
+    // 5.8. Body loop: While position is not past the end of input:
+    // TODO: the steps here are completely wrong
+    {
+      const boundaryIndex = input.indexOf(boundary.subarray(2), position.position)
+
+      if (boundaryIndex === -1) {
+        throw parsingError('expected boundary after body')
+      }
+
+      body = input.subarray(position.position, boundaryIndex - 4)
+
+      position.position += body.length
+
+      // Note: position must be advanced by the body's length before being
+      // decoded, otherwise the parsing will fail.
+      if (encoding === 'base64') {
+        body = Buffer.from(body.toString(), 'base64')
+      }
+    }
+
+    // 5.9. If position does not point to a sequence of bytes starting with
+    //      0x0D 0x0A (CR LF), return failure. Otherwise, advance position by 2.
+    if (input[position.position] !== 0x0d || input[position.position + 1] !== 0x0a) {
+      throw parsingError('expected CRLF')
+    } else {
+      position.position += 2
+    }
+
+    // 5.10. If filename is not null:
+    let value
+
+    if (filename !== null) {
+      // 5.10.1. If contentType is null, set contentType to "text/plain".
+      contentType ??= 'text/plain'
+
+      // 5.10.2. If contentType is not an ASCII string, set contentType to the empty string.
+
+      // Note: `buffer.isAscii` can be used at zero-cost, but converting a string to a buffer is a high overhead.
+      // Content-Type is a relatively small string, so it is faster to use `String#charCodeAt`.
+      if (!isAsciiString(contentType)) {
+        contentType = ''
+      }
+
+      // 5.10.3. Let value be a new File object with name filename, type contentType, and body body.
+      value = new File([body], filename, { type: contentType })
+    } else {
+      // 5.11. Otherwise:
+
+      // 5.11.1. Let value be the UTF-8 decoding without BOM of body.
+      value = utf8DecodeBytes(Buffer.from(body))
+    }
+
+    // 5.12. Assert: name is a scalar value string and value is either a scalar value string or a File object.
+    assert(webidl.is.USVString(name))
+    assert((typeof value === 'string' && webidl.is.USVString(value)) || webidl.is.File(value))
+
+    // 5.13. Create an entry with name and value, and append it to entry list.
+    entryList.push(makeEntry(name, value, filename))
+  }
+}
+
+/**
+ * Parses content-disposition attributes (e.g., name="value" or filename*=utf-8''encoded)
+ * @param {Buffer} input
+ * @param {{ position: number }} position
+ * @returns {{ name: string, value: string }}
+ */
+function parseContentDispositionAttribute (input, position) {
+  // Skip leading semicolon and whitespace
+  if (input[position.position] === 0x3b /* ; */) {
+    position.position++
+  }
+
+  // Skip whitespace
+  collectASequenceOfBytes(
+    (char) => char === 0x20 || char === 0x09,
+    input,
+    position
+  )
+
+  // Collect attribute name (token characters)
+  const attributeName = collectASequenceOfBytes(
+    (char) => isToken(char) && char !== 0x3d && char !== 0x2a, // not = or *
+    input,
+    position
+  )
+
+  if (attributeName.length === 0) {
+    return null
+  }
+
+  const attrNameStr = attributeName.toString('ascii').toLowerCase()
+
+  // Check for extended notation (attribute*)
+  const isExtended = input[position.position] === 0x2a /* * */
+  if (isExtended) {
+    position.position++ // skip *
+  }
+
+  // Expect = sign
+  if (input[position.position] !== 0x3d /* = */) {
+    return null
+  }
+  position.position++ // skip =
+
+  // Skip whitespace
+  collectASequenceOfBytes(
+    (char) => char === 0x20 || char === 0x09,
+    input,
+    position
+  )
+
+  let value
+
+  if (isExtended) {
+    // Extended attribute format: charset'language'encoded-value
+    const headerValue = collectASequenceOfBytes(
+      (char) => char !== 0x20 && char !== 0x0d && char !== 0x0a && char !== 0x3b, // not space, CRLF, or ;
+      input,
+      position
+    )
+
+    // Check for utf-8'' prefix (case insensitive)
+    if (
+      (headerValue[0] !== 0x75 && headerValue[0] !== 0x55) || // u or U
+      (headerValue[1] !== 0x74 && headerValue[1] !== 0x54) || // t or T
+      (headerValue[2] !== 0x66 && headerValue[2] !== 0x46) || // f or F
+      headerValue[3] !== 0x2d || // -
+      headerValue[4] !== 0x38 // 8
+    ) {
+      throw parsingError('unknown encoding, expected utf-8\'\'')
+    }
+
+    // Skip utf-8'' and decode the rest
+    value = decodeURIComponent(decoder.decode(headerValue.subarray(7)))
+  } else if (input[position.position] === 0x22 /* " */) {
+    // Quoted string
+    position.position++ // skip opening quote
+
+    const quotedValue = collectASequenceOfBytes(
+      (char) => char !== 0x0a && char !== 0x0d && char !== 0x22, // not LF, CR, or "
+      input,
+      position
+    )
+
+    if (input[position.position] !== 0x22) {
+      throw parsingError('Closing quote not found')
+    }
+    position.position++ // skip closing quote
+
+    value = decoder.decode(quotedValue)
+      .replace(/%0A/ig, '\n')
+      .replace(/%0D/ig, '\r')
+      .replace(/%22/g, '"')
+  } else {
+    // Token value (no quotes)
+    const tokenValue = collectASequenceOfBytes(
+      (char) => isToken(char) && char !== 0x3b, // not ;
+      input,
+      position
+    )
+
+    value = decoder.decode(tokenValue)
+  }
+
+  return { name: attrNameStr, value }
+}
+
+/**
+ * @see https://andreubotella.github.io/multipart-form-data/#parse-multipart-form-data-headers
+ * @param {Buffer} input
+ * @param {{ position: number }} position
+ */
+function parseMultipartFormDataHeaders (input, position) {
+  // 1. Let name, filename and contentType be null.
+  let name = null
+  let filename = null
+  let contentType = null
+  let encoding = null
+
+  // 2. While true:
+  while (true) {
+    // 2.1. If position points to a sequence of bytes starting with 0x0D 0x0A (CR LF):
+    if (input[position.position] === 0x0d && input[position.position + 1] === 0x0a) {
+      // 2.1.1. If name is null, return failure.
+      if (name === null) {
+        throw parsingError('header name is null')
+      }
+
+      // 2.1.2. Return name, filename and contentType.
+      return { name, filename, contentType, encoding }
+    }
+
+    // 2.2. Let header name be the result of collecting a sequence of bytes that are
+    //      not 0x0A (LF), 0x0D (CR) or 0x3A (:), given position.
+    let headerName = collectASequenceOfBytes(
+      (char) => char !== 0x0a && char !== 0x0d && char !== 0x3a,
+      input,
+      position
+    )
+
+    // 2.3. Remove any HTTP tab or space bytes from the start or end of header name.
+    headerName = removeChars(headerName, true, true, (char) => char === 0x9 || char === 0x20)
+
+    // 2.4. If header name does not match the field-name token production, return failure.
+    if (!HTTP_TOKEN_CODEPOINTS.test(headerName.toString())) {
+      throw parsingError('header name does not match the field-name token production')
+    }
+
+    // 2.5. If the byte at position is not 0x3A (:), return failure.
+    if (input[position.position] !== 0x3a) {
+      throw parsingError('expected :')
+    }
+
+    // 2.6. Advance position by 1.
+    position.position++
+
+    // 2.7. Collect a sequence of bytes that are HTTP tab or space bytes given position.
+    //      (Do nothing with those bytes.)
+    collectASequenceOfBytes(
+      (char) => char === 0x20 || char === 0x09,
+      input,
+      position
+    )
+
+    // 2.8. Byte-lowercase header name and switch on the result:
+    switch (bufferToLowerCasedHeaderName(headerName)) {
+      case 'content-disposition': {
+        name = filename = null
+
+        // Collect the disposition type (should be "form-data")
+        const dispositionType = collectASequenceOfBytes(
+          (char) => isToken(char),
+          input,
+          position
+        )
+
+        if (dispositionType.toString('ascii').toLowerCase() !== 'form-data') {
+          throw parsingError('expected form-data for content-disposition header')
+        }
+
+        // Parse attributes recursively until CRLF
+        while (
+          position.position < input.length &&
+          input[position.position] !== 0x0d &&
+          input[position.position + 1] !== 0x0a
+        ) {
+          const attribute = parseContentDispositionAttribute(input, position)
+
+          if (!attribute) {
+            break
+          }
+
+          if (attribute.name === 'name') {
+            name = attribute.value
+          } else if (attribute.name === 'filename') {
+            filename = attribute.value
+          }
+        }
+
+        if (name === null) {
+          throw parsingError('name attribute is required in content-disposition header')
+        }
+
+        break
+      }
+      case 'content-type': {
+        // 1. Let header value be the result of collecting a sequence of bytes that are
+        //    not 0x0A (LF) or 0x0D (CR), given position.
+        let headerValue = collectASequenceOfBytes(
+          (char) => char !== 0x0a && char !== 0x0d,
+          input,
+          position
+        )
+
+        // 2. Remove any HTTP tab or space bytes from the end of header value.
+        headerValue = removeChars(headerValue, false, true, (char) => char === 0x9 || char === 0x20)
+
+        // 3. Set contentType to the isomorphic decoding of header value.
+        contentType = isomorphicDecode(headerValue)
+
+        break
+      }
+      case 'content-transfer-encoding': {
+        let headerValue = collectASequenceOfBytes(
+          (char) => char !== 0x0a && char !== 0x0d,
+          input,
+          position
+        )
+
+        headerValue = removeChars(headerValue, false, true, (char) => char === 0x9 || char === 0x20)
+
+        encoding = isomorphicDecode(headerValue)
+
+        break
+      }
+      default: {
+        // Collect a sequence of bytes that are not 0x0A (LF) or 0x0D (CR), given position.
+        // (Do nothing with those bytes.)
+        collectASequenceOfBytes(
+          (char) => char !== 0x0a && char !== 0x0d,
+          input,
+          position
+        )
+      }
+    }
+
+    // 2.9. If position does not point to a sequence of bytes starting with 0x0D 0x0A
+    //      (CR LF), return failure. Otherwise, advance position by 2 (past the newline).
+    if (input[position.position] !== 0x0d && input[position.position + 1] !== 0x0a) {
+      throw parsingError('expected CRLF')
+    } else {
+      position.position += 2
+    }
+  }
+}
+
+/**
+ * @param {(char: number) => boolean} condition
+ * @param {Buffer} input
+ * @param {{ position: number }} position
+ */
+function collectASequenceOfBytes (condition, input, position) {
+  let start = position.position
+
+  while (start < input.length && condition(input[start])) {
+    ++start
+  }
+
+  return input.subarray(position.position, (position.position = start))
+}
+
+/**
+ * @param {Buffer} buf
+ * @param {boolean} leading
+ * @param {boolean} trailing
+ * @param {(charCode: number) => boolean} predicate
+ * @returns {Buffer}
+ */
+function removeChars (buf, leading, trailing, predicate) {
+  let lead = 0
+  let trail = buf.length - 1
+
+  if (leading) {
+    while (lead < buf.length && predicate(buf[lead])) lead++
+  }
+
+  if (trailing) {
+    while (trail > 0 && predicate(buf[trail])) trail--
+  }
+
+  return lead === 0 && trail === buf.length - 1 ? buf : buf.subarray(lead, trail + 1)
+}
+
+/**
+ * Checks if {@param buffer} starts with {@param start}
+ * @param {Buffer} buffer
+ * @param {Buffer} start
+ * @param {{ position: number }} position
+ */
+function bufferStartsWith (buffer, start, position) {
+  if (buffer.length < start.length) {
+    return false
+  }
+
+  for (let i = 0; i < start.length; i++) {
+    if (start[i] !== buffer[position.position + i]) {
+      return false
+    }
+  }
+
+  return true
+}
+
+function parsingError (cause) {
+  return new TypeError('Failed to parse body as FormData.', { cause: new TypeError(cause) })
+}
+
+/**
+ * CTL            = <any US-ASCII control character
+ *                  (octets 0 - 31) and DEL (127)>
+ * @param {number} char
+ */
+function isCTL (char) {
+  return char <= 0x1f || char === 0x7f
+}
+
+/**
+ * tspecials :=  "(" / ")" / "<" / ">" / "@" /
+ *                "," / ";" / ":" / "\" / <">
+ *                "/" / "[" / "]" / "?" / "="
+ *                ; Must be in quoted-string,
+ *                ; to use within parameter values
+ * @param {number} char
+ */
+function isTSpecial (char) {
+  return (
+    char === 0x28 || // (
+    char === 0x29 || // )
+    char === 0x3c || // <
+    char === 0x3e || // >
+    char === 0x40 || // @
+    char === 0x2c || // ,
+    char === 0x3b || // ;
+    char === 0x3a || // :
+    char === 0x5c || // \
+    char === 0x22 || // "
+    char === 0x2f || // /
+    char === 0x5b || // [
+    char === 0x5d || // ]
+    char === 0x3f || // ?
+    char === 0x3d    // +
+  )
+}
+
+/**
+ * token := 1*<any (US-ASCII) CHAR except SPACE, CTLs,
+ *          or tspecials>
+ * @param {number} char
+ */
+function isToken (char) {
+  return (
+    char <= 0x7f &&  // ascii
+    char !== 0x20 && // space
+    char !== 0x09 &&
+    !isCTL(char) &&
+    !isTSpecial(char)
+  )
+}
+
+module.exports = {
+  multipartFormDataParser,
+  validateBoundary
+}