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headers.js

'use strict'

/**
 * headers.js
 *
 * Headers class offers convenient helpers
 */

const common = require('./common.js')
const checkInvalidHeaderChar = common.checkInvalidHeaderChar
const checkIsHttpToken = common.checkIsHttpToken

function sanitizeName (name) {
  name += ''
  if (!checkIsHttpToken(name)) {
    throw new TypeError(`${name} is not a legal HTTP header name`)
  }
  return name.toLowerCase()
}

function sanitizeValue (value) {
  value += ''
  if (checkInvalidHeaderChar(value)) {
    throw new TypeError(`${value} is not a legal HTTP header value`)
  }
  return value
}

const MAP = Symbol('map')
class Headers {
  /**
   * Headers class
   *
   * @param   Object  headers  Response headers
   * @return  Void
   */
  constructor (init) {
    this[MAP] = Object.create(null)

if (init instanceof Headers) {
      const rawHeaders = init.raw()
      const headerNames = Object.keys(rawHeaders)

for (const headerName of headerNames) {
        for (const value of rawHeaders[headerName]) {
          this.append(headerName, value)
        }
      }

return
    }

// We don't worry about converting prop to ByteString here as append()
    // will handle it.
    if (init == null) {
      // no op
    } else if (typeof init === 'object') {
      const method = init[Symbol.iterator]
      if (method != null) {
        if (typeof method !== 'function') {
          throw new TypeError('Header pairs must be iterable')
        }

// sequence<sequence<ByteString>>
        // Note: per spec we have to first exhaust the lists then process them
        const pairs = []
        for (const pair of init) {
          if (typeof pair !== 'object' || typeof pair[Symbol.iterator] !== 'function') {
            throw new TypeError('Each header pair must be iterable')
          }
          pairs.push(Array.from(pair))
        }

for (const pair of pairs) {
          if (pair.length !== 2) {
            throw new TypeError('Each header pair must be a name/value tuple')
          }
          this.append(pair[0], pair[1])
        }
      } else {
        // record<ByteString, ByteString>
        for (const key of Object.keys(init)) {
          const value = init[key]
          this.append(key, value)
        }
      }
    } else {
      throw new TypeError('Provided initializer must be an object')
    }

Object.defineProperty(this, Symbol.toStringTag, {
      value: 'Headers',
      writable: false,
      enumerable: false,
      configurable: true
    })
  }

/**
   * Return first header value given name
   *
   * @param   String  name  Header name
   * @return  Mixed
   */
  get (name) {
    const list = this[MAP][sanitizeName(name)]
    if (!list) {
      return null
    }

return list.join(', ')
  }

/**
   * Iterate over all headers
   *
   * @param   Function  callback  Executed for each item with parameters (value, name, thisArg)
   * @param   Boolean   thisArg   `this` context for callback function
   * @return  Void
   */
  forEach (callback, thisArg) {
    let pairs = getHeaderPairs(this)
    let i = 0
    while (i < pairs.length) {
      const name = pairs[i][0]
      const value = pairs[i][1]
      callback.call(thisArg, value, name, this)
      pairs = getHeaderPairs(this)
      i++
    }
  }

/**
   * Overwrite header values given name
   *
   * @param   String  name   Header name
   * @param   String  value  Header value
   * @return  Void
   */
  set (name, value) {
    this[MAP][sanitizeName(name)] = [sanitizeValue(value)]
  }

/**
   * Append a value onto existing header
   *
   * @param   String  name   Header name
   * @param   String  value  Header value
   * @return  Void
   */
  append (name, value) {
    if (!this.has(name)) {
      this.set(name, value)
      return
    }

this[MAP][sanitizeName(name)].push(sanitizeValue(value))
  }

/**
   * Check for header name existence
   *
   * @param   String   name  Header name
   * @return  Boolean
   */
  has (name) {
    return !!this[MAP][sanitizeName(name)]
  }

/**
   * Delete all header values given name
   *
   * @param   String  name  Header name
   * @return  Void
   */
  delete (name) {
    delete this[MAP][sanitizeName(name)]
  };

/**
   * Return raw headers (non-spec api)
   *
   * @return  Object
   */
  raw () {
    return this[MAP]
  }

/**
   * Get an iterator on keys.
   *
   * @return  Iterator
   */
  keys () {
    return createHeadersIterator(this, 'key')
  }

/**
   * Get an iterator on values.
   *
   * @return  Iterator
   */
  values () {
    return createHeadersIterator(this, 'value')
  }

/**
   * Get an iterator on entries.
   *
   * This is the default iterator of the Headers object.
   *
   * @return  Iterator
   */
  [Symbol.iterator] () {
    return createHeadersIterator(this, 'key+value')
  }
}
Headers.prototype.entries = Headers.prototype[Symbol.iterator]

Object.defineProperty(Headers.prototype, Symbol.toStringTag, {
  value: 'HeadersPrototype',
  writable: false,
  enumerable: false,
  configurable: true
})

function getHeaderPairs (headers, kind) {
  const keys = Object.keys(headers[MAP]).sort()
  return keys.map(
    kind === 'key'
      ? k => [k]
      : k => [k, headers.get(k)]
  )
}

const INTERNAL = Symbol('internal')

function createHeadersIterator (target, kind) {
  const iterator = Object.create(HeadersIteratorPrototype)
  iterator[INTERNAL] = {
    target,
    kind,
    index: 0
  }
  return iterator
}

const HeadersIteratorPrototype = Object.setPrototypeOf({
  next () {
    // istanbul ignore if
    if (!this ||
      Object.getPrototypeOf(this) !== HeadersIteratorPrototype) {
      throw new TypeError('Value of `this` is not a HeadersIterator')
    }

const target = this[INTERNAL].target
    const kind = this[INTERNAL].kind
    const index = this[INTERNAL].index
    const values = getHeaderPairs(target, kind)
    const len = values.length
    if (index >= len) {
      return {
        value: undefined,
        done: true
      }
    }

const pair = values[index]
    this[INTERNAL].index = index + 1

let result
    if (kind === 'key') {
      result = pair[0]
    } else if (kind === 'value') {
      result = pair[1]
    } else {
      result = pair
    }

return {
      value: result,
      done: false
    }
  }
}, Object.getPrototypeOf(
  Object.getPrototypeOf([][Symbol.iterator]())
))

Object.defineProperty(HeadersIteratorPrototype, Symbol.toStringTag, {
  value: 'HeadersIterator',
  writable: false,
  enumerable: false,
  configurable: true
})

module.exports = Headers

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	drwxr-xr-x	2024-03-03 10:41:56
..	dir	-	root/root	drwxr-xr-x	2024-03-03 10:41:56
blob.js	text/plain	2.75 KB	root/root	-rw-r--r--	2021-09-28 10:29:51
body.js	text/plain	9.55 KB	root/root	-rw-r--r--	2021-09-28 10:29:51
common.js	text/plain	3.07 KB	root/root	-rw-r--r--	2021-09-28 10:29:51
fetch-error.js	text/plain	886 B	root/root	-rw-r--r--	2021-09-28 10:29:51
headers.js	text/plain	6.41 KB	root/root	-rw-r--r--	2021-09-28 10:29:51
index.js	text/plain	6.75 KB	root/root	-rw-r--r--	2021-09-28 10:29:51
request.js	text/x-c++	4.47 KB	root/root	-rw-r--r--	2021-09-28 10:29:51
response.js	text/plain	1.4 KB	root/root	-rw-r--r--	2021-09-28 10:29:51