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EDIT :: body.js

'use strict'

/**
 * body.js
 *
 * Body interface provides common methods for Request and Response
 */

const Buffer = require('safe-buffer').Buffer

const Blob = require('./blob.js')
const BUFFER = Blob.BUFFER
const convert = require('encoding').convert
const parseJson = require('json-parse-better-errors')
const FetchError = require('./fetch-error.js')
const Stream = require('stream')

const PassThrough = Stream.PassThrough
const DISTURBED = Symbol('disturbed')

/**
 * Body class
 *
 * Cannot use ES6 class because Body must be called with .call().
 *
 * @param   Stream  body  Readable stream
 * @param   Object  opts  Response options
 * @return  Void
 */
exports = module.exports = Body

function Body (body, opts) {
  if (!opts) opts = {}
  const size = opts.size == null ? 0 : opts.size
  const timeout = opts.timeout == null ? 0 : opts.timeout
  if (body == null) {
    // body is undefined or null
    body = null
  } else if (typeof body === 'string') {
    // body is string
  } else if (body instanceof Blob) {
    // body is blob
  } else if (Buffer.isBuffer(body)) {
    // body is buffer
  } else if (body instanceof Stream) {
    // body is stream
  } else {
    // none of the above
    // coerce to string
    body = String(body)
  }
  this.body = body
  this[DISTURBED] = false
  this.size = size
  this.timeout = timeout
}

Body.prototype = {
  get bodyUsed () {
    return this[DISTURBED]
  },

/**
   * Decode response as ArrayBuffer
   *
   * @return  Promise
   */
  arrayBuffer () {
    return consumeBody.call(this).then(buf => buf.buffer.slice(buf.byteOffset, buf.byteOffset + buf.byteLength))
  },

/**
   * Return raw response as Blob
   *
   * @return Promise
   */
  blob () {
    let ct = (this.headers && this.headers.get('content-type')) || ''
    return consumeBody.call(this).then(buf => Object.assign(
      // Prevent copying
      new Blob([], {
        type: ct.toLowerCase()
      }),
      {
        [BUFFER]: buf
      }
    ))
  },

/**
   * Decode response as json
   *
   * @return  Promise
   */
  json () {
    return consumeBody.call(this).then(buffer => parseJson(buffer.toString()))
  },

/**
   * Decode response as text
   *
   * @return  Promise
   */
  text () {
    return consumeBody.call(this).then(buffer => buffer.toString())
  },

/**
   * Decode response as buffer (non-spec api)
   *
   * @return  Promise
   */
  buffer () {
    return consumeBody.call(this)
  },

/**
   * Decode response as text, while automatically detecting the encoding and
   * trying to decode to UTF-8 (non-spec api)
   *
   * @return  Promise
   */
  textConverted () {
    return consumeBody.call(this).then(buffer => convertBody(buffer, this.headers))
  }

}

Body.mixIn = function (proto) {
  for (const name of Object.getOwnPropertyNames(Body.prototype)) {
    // istanbul ignore else: future proof
    if (!(name in proto)) {
      const desc = Object.getOwnPropertyDescriptor(Body.prototype, name)
      Object.defineProperty(proto, name, desc)
    }
  }
}

/**
 * Decode buffers into utf-8 string
 *
 * @return  Promise
 */
function consumeBody (body) {
  if (this[DISTURBED]) {
    return Body.Promise.reject(new Error(`body used already for: ${this.url}`))
  }

this[DISTURBED] = true

// body is null
  if (this.body === null) {
    return Body.Promise.resolve(Buffer.alloc(0))
  }

// body is string
  if (typeof this.body === 'string') {
    return Body.Promise.resolve(Buffer.from(this.body))
  }

// body is blob
  if (this.body instanceof Blob) {
    return Body.Promise.resolve(this.body[BUFFER])
  }

// body is buffer
  if (Buffer.isBuffer(this.body)) {
    return Body.Promise.resolve(this.body)
  }

// istanbul ignore if: should never happen
  if (!(this.body instanceof Stream)) {
    return Body.Promise.resolve(Buffer.alloc(0))
  }

// body is stream
  // get ready to actually consume the body
  let accum = []
  let accumBytes = 0
  let abort = false

return new Body.Promise((resolve, reject) => {
    let resTimeout

// allow timeout on slow response body
    if (this.timeout) {
      resTimeout = setTimeout(() => {
        abort = true
        reject(new FetchError(`Response timeout while trying to fetch ${this.url} (over ${this.timeout}ms)`, 'body-timeout'))
      }, this.timeout)
    }

// handle stream error, such as incorrect content-encoding
    this.body.on('error', err => {
      reject(new FetchError(`Invalid response body while trying to fetch ${this.url}: ${err.message}`, 'system', err))
    })

this.body.on('data', chunk => {
      if (abort || chunk === null) {
        return
      }

if (this.size && accumBytes + chunk.length > this.size) {
        abort = true
        reject(new FetchError(`content size at ${this.url} over limit: ${this.size}`, 'max-size'))
        return
      }

accumBytes += chunk.length
      accum.push(chunk)
    })

this.body.on('end', () => {
      if (abort) {
        return
      }

clearTimeout(resTimeout)
      resolve(Buffer.concat(accum))
    })
  })
}

/**
 * Detect buffer encoding and convert to target encoding
 * ref: http://www.w3.org/TR/2011/WD-html5-20110113/parsing.html#determining-the-character-encoding
 *
 * @param   Buffer  buffer    Incoming buffer
 * @param   String  encoding  Target encoding
 * @return  String
 */
function convertBody (buffer, headers) {
  const ct = headers.get('content-type')
  let charset = 'utf-8'
  let res, str

// header
  if (ct) {
    res = /charset=([^;]*)/i.exec(ct)
  }

// no charset in content type, peek at response body for at most 1024 bytes
  str = buffer.slice(0, 1024).toString()

// html5
  if (!res && str) {
    res = /<meta.+?charset=(['"])(.+?)\1/i.exec(str)
  }

// html4
  if (!res && str) {
    res = /<meta[\s]+?http-equiv=(['"])content-type\1[\s]+?content=(['"])(.+?)\2/i.exec(str)

if (res) {
      res = /charset=(.*)/i.exec(res.pop())
    }
  }

// xml
  if (!res && str) {
    res = /<\?xml.+?encoding=(['"])(.+?)\1/i.exec(str)
  }

// found charset
  if (res) {
    charset = res.pop()

// prevent decode issues when sites use incorrect encoding
    // ref: https://hsivonen.fi/encoding-menu/
    if (charset === 'gb2312' || charset === 'gbk') {
      charset = 'gb18030'
    }
  }

// turn raw buffers into a single utf-8 buffer
  return convert(
    buffer
    , 'UTF-8'
    , charset
  ).toString()
}

/**
 * Clone body given Res/Req instance
 *
 * @param   Mixed  instance  Response or Request instance
 * @return  Mixed
 */
exports.clone = function clone (instance) {
  let p1, p2
  let body = instance.body

// don't allow cloning a used body
  if (instance.bodyUsed) {
    throw new Error('cannot clone body after it is used')
  }

// check that body is a stream and not form-data object
  // note: we can't clone the form-data object without having it as a dependency
  if ((body instanceof Stream) && (typeof body.getBoundary !== 'function')) {
    // tee instance body
    p1 = new PassThrough()
    p2 = new PassThrough()
    body.pipe(p1)
    body.pipe(p2)
    // set instance body to teed body and return the other teed body
    instance.body = p1
    body = p2
  }

return body
}

/**
 * Performs the operation "extract a `Content-Type` value from |object|" as
 * specified in the specification:
 * https://fetch.spec.whatwg.org/#concept-bodyinit-extract
 *
 * This function assumes that instance.body is present and non-null.
 *
 * @param   Mixed  instance  Response or Request instance
 */
exports.extractContentType = function extractContentType (instance) {
  const body = instance.body

// istanbul ignore if: Currently, because of a guard in Request, body
  // can never be null. Included here for completeness.
  if (body === null) {
    // body is null
    return null
  } else if (typeof body === 'string') {
    // body is string
    return 'text/plain;charset=UTF-8'
  } else if (body instanceof Blob) {
    // body is blob
    return body.type || null
  } else if (Buffer.isBuffer(body)) {
    // body is buffer
    return null
  } else if (typeof body.getBoundary === 'function') {
    // detect form data input from form-data module
    return `multipart/form-data;boundary=${body.getBoundary()}`
  } else {
    // body is stream
    // can't really do much about this
    return null
  }
}

exports.getTotalBytes = function getTotalBytes (instance) {
  const body = instance.body

// istanbul ignore if: included for completion
  if (body === null) {
    // body is null
    return 0
  } else if (typeof body === 'string') {
    // body is string
    return Buffer.byteLength(body)
  } else if (body instanceof Blob) {
    // body is blob
    return body.size
  } else if (Buffer.isBuffer(body)) {
    // body is buffer
    return body.length
  } else if (body && typeof body.getLengthSync === 'function') {
    // detect form data input from form-data module
    if ((
      // 1.x
      body._lengthRetrievers &&
      body._lengthRetrievers.length === 0
    ) || (
      // 2.x
      body.hasKnownLength && body.hasKnownLength()
    )) {
      return body.getLengthSync()
    }
    return null
  } else {
    // body is stream
    // can't really do much about this
    return null
  }
}

exports.writeToStream = function writeToStream (dest, instance) {
  const body = instance.body

if (body === null) {
    // body is null
    dest.end()
  } else if (typeof body === 'string') {
    // body is string
    dest.write(body)
    dest.end()
  } else if (body instanceof Blob) {
    // body is blob
    dest.write(body[BUFFER])
    dest.end()
  } else if (Buffer.isBuffer(body)) {
    // body is buffer
    dest.write(body)
    dest.end()
  } else {
    // body is stream
    body.pipe(dest)
  }
}

// expose Promise
Body.Promise = global.Promise

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EDIT :: body.js