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'use strict' const invalidTokenRegex = /[^^_`a-zA-Z\-0-9!#$%&'*+.|~]/ const invalidHeaderCharRegex = /[^\t\x20-\x7e\x80-\xff]/ const validateName = name => { name = `${name}` if (invalidTokenRegex.test(name) || name === '') { throw new TypeError(`${name} is not a legal HTTP header name`) } } const validateValue = value => { value = `${value}` if (invalidHeaderCharRegex.test(value)) { throw new TypeError(`${value} is not a legal HTTP header value`) } } const find = (map, name) => { name = name.toLowerCase() for (const key in map) { if (key.toLowerCase() === name) { return key } } return undefined } const MAP = Symbol('map') class Headers { constructor (init = undefined) { this[MAP] = Object.create(null) if (init instanceof Headers) { const rawHeaders = init.raw() const headerNames = Object.keys(rawHeaders) for (const headerName of headerNames) { for (const value of rawHeaders[headerName]) { this.append(headerName, value) } } return } // no-op if (init === undefined || init === null) { return } if (typeof init === 'object') { const method = init[Symbol.iterator] if (method !== null && method !== undefined) { if (typeof method !== 'function') { throw new TypeError('Header pairs must be iterable') } // sequence<sequence<ByteString>> // Note: per spec we have to first exhaust the lists then process them const pairs = [] for (const pair of init) { if (typeof pair !== 'object' || typeof pair[Symbol.iterator] !== 'function') { throw new TypeError('Each header pair must be iterable') } const arrPair = Array.from(pair) if (arrPair.length !== 2) { throw new TypeError('Each header pair must be a name/value tuple') } pairs.push(arrPair) } for (const pair of pairs) { this.append(pair[0], pair[1]) } } else { // record<ByteString, ByteString> for (const key of Object.keys(init)) { this.append(key, init[key]) } } } else { throw new TypeError('Provided initializer must be an object') } } get (name) { name = `${name}` validateName(name) const key = find(this[MAP], name) if (key === undefined) { return null } return this[MAP][key].join(', ') } forEach (callback, thisArg = undefined) { let pairs = getHeaders(this) for (let i = 0; i < pairs.length; i++) { const [name, value] = pairs[i] callback.call(thisArg, value, name, this) // refresh in case the callback added more headers pairs = getHeaders(this) } } set (name, value) { name = `${name}` value = `${value}` validateName(name) validateValue(value) const key = find(this[MAP], name) this[MAP][key !== undefined ? key : name] = [value] } append (name, value) { name = `${name}` value = `${value}` validateName(name) validateValue(value) const key = find(this[MAP], name) if (key !== undefined) { this[MAP][key].push(value) } else { this[MAP][name] = [value] } } has (name) { name = `${name}` validateName(name) return find(this[MAP], name) !== undefined } delete (name) { name = `${name}` validateName(name) const key = find(this[MAP], name) if (key !== undefined) { delete this[MAP][key] } } raw () { return this[MAP] } keys () { return new HeadersIterator(this, 'key') } values () { return new HeadersIterator(this, 'value') } [Symbol.iterator] () { return new HeadersIterator(this, 'key+value') } entries () { return new HeadersIterator(this, 'key+value') } get [Symbol.toStringTag] () { return 'Headers' } static exportNodeCompatibleHeaders (headers) { const obj = Object.assign(Object.create(null), headers[MAP]) // http.request() only supports string as Host header. This hack makes // specifying custom Host header possible. const hostHeaderKey = find(headers[MAP], 'Host') if (hostHeaderKey !== undefined) { obj[hostHeaderKey] = obj[hostHeaderKey][0] } return obj } static createHeadersLenient (obj) { const headers = new Headers() for (const name of Object.keys(obj)) { if (invalidTokenRegex.test(name)) { continue } if (Array.isArray(obj[name])) { for (const val of obj[name]) { if (invalidHeaderCharRegex.test(val)) { continue } if (headers[MAP][name] === undefined) { headers[MAP][name] = [val] } else { headers[MAP][name].push(val) } } } else if (!invalidHeaderCharRegex.test(obj[name])) { headers[MAP][name] = [obj[name]] } } return headers } } Object.defineProperties(Headers.prototype, { get: { enumerable: true }, forEach: { enumerable: true }, set: { enumerable: true }, append: { enumerable: true }, has: { enumerable: true }, delete: { enumerable: true }, keys: { enumerable: true }, values: { enumerable: true }, entries: { enumerable: true }, }) const getHeaders = (headers, kind = 'key+value') => Object.keys(headers[MAP]).sort().map( kind === 'key' ? k => k.toLowerCase() : kind === 'value' ? k => headers[MAP][k].join(', ') : k => [k.toLowerCase(), headers[MAP][k].join(', ')] ) const INTERNAL = Symbol('internal') class HeadersIterator { constructor (target, kind) { this[INTERNAL] = { target, kind, index: 0, } } get [Symbol.toStringTag] () { return 'HeadersIterator' } next () { /* istanbul ignore if: should be impossible */ if (!this || Object.getPrototypeOf(this) !== HeadersIterator.prototype) { throw new TypeError('Value of `this` is not a HeadersIterator') } const { target, kind, index } = this[INTERNAL] const values = getHeaders(target, kind) const len = values.length if (index >= len) { return { value: undefined, done: true, } } this[INTERNAL].index++ return { value: values[index], done: false } } } // manually extend because 'extends' requires a ctor Object.setPrototypeOf(HeadersIterator.prototype, Object.getPrototypeOf(Object.getPrototypeOf([][Symbol.iterator]()))) module.exports = Headers