1 files changed, 605 insertions, 0 deletions
diff --git a/lib/fetch/body.js b/lib/fetch/body.js
new file mode 100644
index 0000000..fd8481b
--- /dev/null
+++ b/lib/fetch/body.js
@@ -0,0 +1,605 @@
+'use strict'
+
+const Busboy = require('@fastify/busboy')
+const util = require('../core/util')
+const {
+  ReadableStreamFrom,
+  isBlobLike,
+  isReadableStreamLike,
+  readableStreamClose,
+  createDeferredPromise,
+  fullyReadBody
+} = require('./util')
+const { FormData } = require('./formdata')
+const { kState } = require('./symbols')
+const { webidl } = require('./webidl')
+const { DOMException, structuredClone } = require('./constants')
+const { Blob, File: NativeFile } = require('buffer')
+const { kBodyUsed } = require('../core/symbols')
+const assert = require('assert')
+const { isErrored } = require('../core/util')
+const { isUint8Array, isArrayBuffer } = require('util/types')
+const { File: UndiciFile } = require('./file')
+const { parseMIMEType, serializeAMimeType } = require('./dataURL')
+
+let ReadableStream = globalThis.ReadableStream
+
+/** @type {globalThis['File']} */
+const File = NativeFile ?? UndiciFile
+const textEncoder = new TextEncoder()
+const textDecoder = new TextDecoder()
+
+// https://fetch.spec.whatwg.org/#concept-bodyinit-extract
+function extractBody (object, keepalive = false) {
+  if (!ReadableStream) {
+    ReadableStream = require('stream/web').ReadableStream
+  }
+
+  // 1. Let stream be null.
+  let stream = null
+
+  // 2. If object is a ReadableStream object, then set stream to object.
+  if (object instanceof ReadableStream) {
+    stream = object
+  } else if (isBlobLike(object)) {
+    // 3. Otherwise, if object is a Blob object, set stream to the
+    //    result of running object’s get stream.
+    stream = object.stream()
+  } else {
+    // 4. Otherwise, set stream to a new ReadableStream object, and set
+    //    up stream.
+    stream = new ReadableStream({
+      async pull (controller) {
+        controller.enqueue(
+          typeof source === 'string' ? textEncoder.encode(source) : source
+        )
+        queueMicrotask(() => readableStreamClose(controller))
+      },
+      start () {},
+      type: undefined
+    })
+  }
+
+  // 5. Assert: stream is a ReadableStream object.
+  assert(isReadableStreamLike(stream))
+
+  // 6. Let action be null.
+  let action = null
+
+  // 7. Let source be null.
+  let source = null
+
+  // 8. Let length be null.
+  let length = null
+
+  // 9. Let type be null.
+  let type = null
+
+  // 10. Switch on object:
+  if (typeof object === 'string') {
+    // Set source to the UTF-8 encoding of object.
+    // Note: setting source to a Uint8Array here breaks some mocking assumptions.
+    source = object
+
+    // Set type to `text/plain;charset=UTF-8`.
+    type = 'text/plain;charset=UTF-8'
+  } else if (object instanceof URLSearchParams) {
+    // URLSearchParams
+
+    // spec says to run application/x-www-form-urlencoded on body.list
+    // this is implemented in Node.js as apart of an URLSearchParams instance toString method
+    // See: https://github.com/nodejs/node/blob/e46c680bf2b211bbd52cf959ca17ee98c7f657f5/lib/internal/url.js#L490
+    // and https://github.com/nodejs/node/blob/e46c680bf2b211bbd52cf959ca17ee98c7f657f5/lib/internal/url.js#L1100
+
+    // Set source to the result of running the application/x-www-form-urlencoded serializer with object’s list.
+    source = object.toString()
+
+    // Set type to `application/x-www-form-urlencoded;charset=UTF-8`.
+    type = 'application/x-www-form-urlencoded;charset=UTF-8'
+  } else if (isArrayBuffer(object)) {
+    // BufferSource/ArrayBuffer
+
+    // Set source to a copy of the bytes held by object.
+    source = new Uint8Array(object.slice())
+  } else if (ArrayBuffer.isView(object)) {
+    // BufferSource/ArrayBufferView
+
+    // Set source to a copy of the bytes held by object.
+    source = new Uint8Array(object.buffer.slice(object.byteOffset, object.byteOffset + object.byteLength))
+  } else if (util.isFormDataLike(object)) {
+    const boundary = `----formdata-undici-0${`${Math.floor(Math.random() * 1e11)}`.padStart(11, '0')}`
+    const prefix = `--${boundary}\r\nContent-Disposition: form-data`
+
+    /*! formdata-polyfill. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
+    const escape = (str) =>
+      str.replace(/\n/g, '%0A').replace(/\r/g, '%0D').replace(/"/g, '%22')
+    const normalizeLinefeeds = (value) => value.replace(/\r?\n|\r/g, '\r\n')
+
+    // Set action to this step: run the multipart/form-data
+    // encoding algorithm, with object’s entry list and UTF-8.
+    // - This ensures that the body is immutable and can't be changed afterwords
+    // - That the content-length is calculated in advance.
+    // - And that all parts are pre-encoded and ready to be sent.
+
+    const blobParts = []
+    const rn = new Uint8Array([13, 10]) // '\r\n'
+    length = 0
+    let hasUnknownSizeValue = false
+
+    for (const [name, value] of object) {
+      if (typeof value === 'string') {
+        const chunk = textEncoder.encode(prefix +
+          `; name="${escape(normalizeLinefeeds(name))}"` +
+          `\r\n\r\n${normalizeLinefeeds(value)}\r\n`)
+        blobParts.push(chunk)
+        length += chunk.byteLength
+      } else {
+        const chunk = textEncoder.encode(`${prefix}; name="${escape(normalizeLinefeeds(name))}"` +
+          (value.name ? `; filename="${escape(value.name)}"` : '') + '\r\n' +
+          `Content-Type: ${
+            value.type || 'application/octet-stream'
+          }\r\n\r\n`)
+        blobParts.push(chunk, value, rn)
+        if (typeof value.size === 'number') {
+          length += chunk.byteLength + value.size + rn.byteLength
+        } else {
+          hasUnknownSizeValue = true
+        }
+      }
+    }
+
+    const chunk = textEncoder.encode(`--${boundary}--`)
+    blobParts.push(chunk)
+    length += chunk.byteLength
+    if (hasUnknownSizeValue) {
+      length = null
+    }
+
+    // Set source to object.
+    source = object
+
+    action = async function * () {
+      for (const part of blobParts) {
+        if (part.stream) {
+          yield * part.stream()
+        } else {
+          yield part
+        }
+      }
+    }
+
+    // Set type to `multipart/form-data; boundary=`,
+    // followed by the multipart/form-data boundary string generated
+    // by the multipart/form-data encoding algorithm.
+    type = 'multipart/form-data; boundary=' + boundary
+  } else if (isBlobLike(object)) {
+    // Blob
+
+    // Set source to object.
+    source = object
+
+    // Set length to object’s size.
+    length = object.size
+
+    // If object’s type attribute is not the empty byte sequence, set
+    // type to its value.
+    if (object.type) {
+      type = object.type
+    }
+  } else if (typeof object[Symbol.asyncIterator] === 'function') {
+    // If keepalive is true, then throw a TypeError.
+    if (keepalive) {
+      throw new TypeError('keepalive')
+    }
+
+    // If object is disturbed or locked, then throw a TypeError.
+    if (util.isDisturbed(object) || object.locked) {
+      throw new TypeError(
+        'Response body object should not be disturbed or locked'
+      )
+    }
+
+    stream =
+      object instanceof ReadableStream ? object : ReadableStreamFrom(object)
+  }
+
+  // 11. If source is a byte sequence, then set action to a
+  // step that returns source and length to source’s length.
+  if (typeof source === 'string' || util.isBuffer(source)) {
+    length = Buffer.byteLength(source)
+  }
+
+  // 12. If action is non-null, then run these steps in in parallel:
+  if (action != null) {
+    // Run action.
+    let iterator
+    stream = new ReadableStream({
+      async start () {
+        iterator = action(object)[Symbol.asyncIterator]()
+      },
+      async pull (controller) {
+        const { value, done } = await iterator.next()
+        if (done) {
+          // When running action is done, close stream.
+          queueMicrotask(() => {
+            controller.close()
+          })
+        } else {
+          // Whenever one or more bytes are available and stream is not errored,
+          // enqueue a Uint8Array wrapping an ArrayBuffer containing the available
+          // bytes into stream.
+          if (!isErrored(stream)) {
+            controller.enqueue(new Uint8Array(value))
+          }
+        }
+        return controller.desiredSize > 0
+      },
+      async cancel (reason) {
+        await iterator.return()
+      },
+      type: undefined
+    })
+  }
+
+  // 13. Let body be a body whose stream is stream, source is source,
+  // and length is length.
+  const body = { stream, source, length }
+
+  // 14. Return (body, type).
+  return [body, type]
+}
+
+// https://fetch.spec.whatwg.org/#bodyinit-safely-extract
+function safelyExtractBody (object, keepalive = false) {
+  if (!ReadableStream) {
+    // istanbul ignore next
+    ReadableStream = require('stream/web').ReadableStream
+  }
+
+  // To safely extract a body and a `Content-Type` value from
+  // a byte sequence or BodyInit object object, run these steps:
+
+  // 1. If object is a ReadableStream object, then:
+  if (object instanceof ReadableStream) {
+    // Assert: object is neither disturbed nor locked.
+    // istanbul ignore next
+    assert(!util.isDisturbed(object), 'The body has already been consumed.')
+    // istanbul ignore next
+    assert(!object.locked, 'The stream is locked.')
+  }
+
+  // 2. Return the results of extracting object.
+  return extractBody(object, keepalive)
+}
+
+function cloneBody (body) {
+  // To clone a body body, run these steps:
+
+  // https://fetch.spec.whatwg.org/#concept-body-clone
+
+  // 1. Let « out1, out2 » be the result of teeing body’s stream.
+  const [out1, out2] = body.stream.tee()
+  const out2Clone = structuredClone(out2, { transfer: [out2] })
+  // This, for whatever reasons, unrefs out2Clone which allows
+  // the process to exit by itself.
+  const [, finalClone] = out2Clone.tee()
+
+  // 2. Set body’s stream to out1.
+  body.stream = out1
+
+  // 3. Return a body whose stream is out2 and other members are copied from body.
+  return {
+    stream: finalClone,
+    length: body.length,
+    source: body.source
+  }
+}
+
+async function * consumeBody (body) {
+  if (body) {
+    if (isUint8Array(body)) {
+      yield body
+    } else {
+      const stream = body.stream
+
+      if (util.isDisturbed(stream)) {
+        throw new TypeError('The body has already been consumed.')
+      }
+
+      if (stream.locked) {
+        throw new TypeError('The stream is locked.')
+      }
+
+      // Compat.
+      stream[kBodyUsed] = true
+
+      yield * stream
+    }
+  }
+}
+
+function throwIfAborted (state) {
+  if (state.aborted) {
+    throw new DOMException('The operation was aborted.', 'AbortError')
+  }
+}
+
+function bodyMixinMethods (instance) {
+  const methods = {
+    blob () {
+      // The blob() method steps are to return the result of
+      // running consume body with this and the following step
+      // given a byte sequence bytes: return a Blob whose
+      // contents are bytes and whose type attribute is this’s
+      // MIME type.
+      return specConsumeBody(this, (bytes) => {
+        let mimeType = bodyMimeType(this)
+
+        if (mimeType === 'failure') {
+          mimeType = ''
+        } else if (mimeType) {
+          mimeType = serializeAMimeType(mimeType)
+        }
+
+        // Return a Blob whose contents are bytes and type attribute
+        // is mimeType.
+        return new Blob([bytes], { type: mimeType })
+      }, instance)
+    },
+
+    arrayBuffer () {
+      // The arrayBuffer() method steps are to return the result
+      // of running consume body with this and the following step
+      // given a byte sequence bytes: return a new ArrayBuffer
+      // whose contents are bytes.
+      return specConsumeBody(this, (bytes) => {
+        return new Uint8Array(bytes).buffer
+      }, instance)
+    },
+
+    text () {
+      // The text() method steps are to return the result of running
+      // consume body with this and UTF-8 decode.
+      return specConsumeBody(this, utf8DecodeBytes, instance)
+    },
+
+    json () {
+      // The json() method steps are to return the result of running
+      // consume body with this and parse JSON from bytes.
+      return specConsumeBody(this, parseJSONFromBytes, instance)
+    },
+
+    async formData () {
+      webidl.brandCheck(this, instance)
+
+      throwIfAborted(this[kState])
+
+      const contentType = this.headers.get('Content-Type')
+
+      // If mimeType’s essence is "multipart/form-data", then:
+      if (/multipart\/form-data/.test(contentType)) {
+        const headers = {}
+        for (const [key, value] of this.headers) headers[key.toLowerCase()] = value
+
+        const responseFormData = new FormData()
+
+        let busboy
+
+        try {
+          busboy = new Busboy({
+            headers,
+            preservePath: true
+          })
+        } catch (err) {
+          throw new DOMException(`${err}`, 'AbortError')
+        }
+
+        busboy.on('field', (name, value) => {
+          responseFormData.append(name, value)
+        })
+        busboy.on('file', (name, value, filename, encoding, mimeType) => {
+          const chunks = []
+
+          if (encoding === 'base64' || encoding.toLowerCase() === 'base64') {
+            let base64chunk = ''
+
+            value.on('data', (chunk) => {
+              base64chunk += chunk.toString().replace(/[\r\n]/gm, '')
+
+              const end = base64chunk.length - base64chunk.length % 4
+              chunks.push(Buffer.from(base64chunk.slice(0, end), 'base64'))
+
+              base64chunk = base64chunk.slice(end)
+            })
+            value.on('end', () => {
+              chunks.push(Buffer.from(base64chunk, 'base64'))
+              responseFormData.append(name, new File(chunks, filename, { type: mimeType }))
+            })
+          } else {
+            value.on('data', (chunk) => {
+              chunks.push(chunk)
+            })
+            value.on('end', () => {
+              responseFormData.append(name, new File(chunks, filename, { type: mimeType }))
+            })
+          }
+        })
+
+        const busboyResolve = new Promise((resolve, reject) => {
+          busboy.on('finish', resolve)
+          busboy.on('error', (err) => reject(new TypeError(err)))
+        })
+
+        if (this.body !== null) for await (const chunk of consumeBody(this[kState].body)) busboy.write(chunk)
+        busboy.end()
+        await busboyResolve
+
+        return responseFormData
+      } else if (/application\/x-www-form-urlencoded/.test(contentType)) {
+        // Otherwise, if mimeType’s essence is "application/x-www-form-urlencoded", then:
+
+        // 1. Let entries be the result of parsing bytes.
+        let entries
+        try {
+          let text = ''
+          // application/x-www-form-urlencoded parser will keep the BOM.
+          // https://url.spec.whatwg.org/#concept-urlencoded-parser
+          // Note that streaming decoder is stateful and cannot be reused
+          const streamingDecoder = new TextDecoder('utf-8', { ignoreBOM: true })
+
+          for await (const chunk of consumeBody(this[kState].body)) {
+            if (!isUint8Array(chunk)) {
+              throw new TypeError('Expected Uint8Array chunk')
+            }
+            text += streamingDecoder.decode(chunk, { stream: true })
+          }
+          text += streamingDecoder.decode()
+          entries = new URLSearchParams(text)
+        } catch (err) {
+          // istanbul ignore next: Unclear when new URLSearchParams can fail on a string.
+          // 2. If entries is failure, then throw a TypeError.
+          throw Object.assign(new TypeError(), { cause: err })
+        }
+
+        // 3. Return a new FormData object whose entries are entries.
+        const formData = new FormData()
+        for (const [name, value] of entries) {
+          formData.append(name, value)
+        }
+        return formData
+      } else {
+        // Wait a tick before checking if the request has been aborted.
+        // Otherwise, a TypeError can be thrown when an AbortError should.
+        await Promise.resolve()
+
+        throwIfAborted(this[kState])
+
+        // Otherwise, throw a TypeError.
+        throw webidl.errors.exception({
+          header: `${instance.name}.formData`,
+          message: 'Could not parse content as FormData.'
+        })
+      }
+    }
+  }
+
+  return methods
+}
+
+function mixinBody (prototype) {
+  Object.assign(prototype.prototype, bodyMixinMethods(prototype))
+}
+
+/**
+ * @see https://fetch.spec.whatwg.org/#concept-body-consume-body
+ * @param {Response|Request} object
+ * @param {(value: unknown) => unknown} convertBytesToJSValue
+ * @param {Response|Request} instance
+ */
+async function specConsumeBody (object, convertBytesToJSValue, instance) {
+  webidl.brandCheck(object, instance)
+
+  throwIfAborted(object[kState])
+
+  // 1. If object is unusable, then return a promise rejected
+  //    with a TypeError.
+  if (bodyUnusable(object[kState].body)) {
+    throw new TypeError('Body is unusable')
+  }
+
+  // 2. Let promise be a new promise.
+  const promise = createDeferredPromise()
+
+  // 3. Let errorSteps given error be to reject promise with error.
+  const errorSteps = (error) => promise.reject(error)
+
+  // 4. Let successSteps given a byte sequence data be to resolve
+  //    promise with the result of running convertBytesToJSValue
+  //    with data. If that threw an exception, then run errorSteps
+  //    with that exception.
+  const successSteps = (data) => {
+    try {
+      promise.resolve(convertBytesToJSValue(data))
+    } catch (e) {
+      errorSteps(e)
+    }
+  }
+
+  // 5. If object’s body is null, then run successSteps with an
+  //    empty byte sequence.
+  if (object[kState].body == null) {
+    successSteps(new Uint8Array())
+    return promise.promise
+  }
+
+  // 6. Otherwise, fully read object’s body given successSteps,
+  //    errorSteps, and object’s relevant global object.
+  await fullyReadBody(object[kState].body, successSteps, errorSteps)
+
+  // 7. Return promise.
+  return promise.promise
+}
+
+// https://fetch.spec.whatwg.org/#body-unusable
+function bodyUnusable (body) {
+  // An object including the Body interface mixin is
+  // said to be unusable if its body is non-null and
+  // its body’s stream is disturbed or locked.
+  return body != null && (body.stream.locked || util.isDisturbed(body.stream))
+}
+
+/**
+ * @see https://encoding.spec.whatwg.org/#utf-8-decode
+ * @param {Buffer} buffer
+ */
+function utf8DecodeBytes (buffer) {
+  if (buffer.length === 0) {
+    return ''
+  }
+
+  // 1. Let buffer be the result of peeking three bytes from
+  //    ioQueue, converted to a byte sequence.
+
+  // 2. If buffer is 0xEF 0xBB 0xBF, then read three
+  //    bytes from ioQueue. (Do nothing with those bytes.)
+  if (buffer[0] === 0xEF && buffer[1] === 0xBB && buffer[2] === 0xBF) {
+    buffer = buffer.subarray(3)
+  }
+
+  // 3. Process a queue with an instance of UTF-8’s
+  //    decoder, ioQueue, output, and "replacement".
+  const output = textDecoder.decode(buffer)
+
+  // 4. Return output.
+  return output
+}
+
+/**
+ * @see https://infra.spec.whatwg.org/#parse-json-bytes-to-a-javascript-value
+ * @param {Uint8Array} bytes
+ */
+function parseJSONFromBytes (bytes) {
+  return JSON.parse(utf8DecodeBytes(bytes))
+}
+
+/**
+ * @see https://fetch.spec.whatwg.org/#concept-body-mime-type
+ * @param {import('./response').Response|import('./request').Request} object
+ */
+function bodyMimeType (object) {
+  const { headersList } = object[kState]
+  const contentType = headersList.get('content-type')
+
+  if (contentType === null) {
+    return 'failure'
+  }
+
+  return parseMIMEType(contentType)
+}
+
+module.exports = {
+  extractBody,
+  safelyExtractBody,
+  cloneBody,
+  mixinBody
+}