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headers.js
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headers.js
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/*! fetch-headers. MIT License. Jimmy Wärting <https://jimmy.warting.se/opensource> */
/** @param {Headers} instance */
function assert (instance, argsCount = 0, requiredArgs = 0, method = '') {
if (!(instance instanceof Headers)) {
throw new TypeError('Illegal invocation')
}
if (argsCount < requiredArgs) {
throw new TypeError(`"Failed to execute '${method}' on 'Headers'" requires at least ${requiredArgs} argument, but only ${argsCount} were provided.`)
}
return /** @type {Bag} */ (wm.get(instance))
}
/**
* @typedef Bag
* @property {Object<string, string>} items
* @property {Array<string>} cookies
* @property {string} guard
*/
/**
* @param {Bag} bag
* @param {HeadersInit} object
*/
function fillHeaders (bag, object) {
if (object === null) throw new TypeError("HeadersInit can't be null.")
const iterable = object[Symbol.iterator]
if (iterable) {
// @ts-ignore
for (let header of object) {
if (typeof header === 'string') {
throw new TypeError('The provided value cannot be converted to a sequence.')
}
if (header[Symbol.iterator] && !Array.isArray(header)) {
header = [...header]
}
if (header.length !== 2) {
throw new TypeError(`Invalid header. Length must be 2, but is ${header.length}`)
}
appendHeader(bag, header[0], header[1])
}
} else {
for (const key of Reflect.ownKeys(object)) {
const x = Reflect.getOwnPropertyDescriptor(object, key)
if (x === undefined || !x.enumerable) continue
if (typeof key === 'symbol') {
throw new TypeError('Invalid header. Symbol key is not supported.')
}
if (!HTTP_TOKEN_CODE_POINT_RE.test(key)) {
throw new TypeError('Header name is not valid.')
}
appendHeader(bag, key, Reflect.get(object, key))
}
}
}
const ILLEGAL_VALUE_CHARS = /[\x00\x0A\x0D]/g
const IS_BYTE_STRING = /^[\x00-\xFF]*$/
const HTTP_TOKEN_CODE_POINT_RE = /^[\u0021\u0023\u0024\u0025\u0026\u0027\u002a\u002b\u002d\u002e\u005e\u005f\u0060\u007c\u007e\u0030-\u0039\u0041-\u005a\u0061-\u007a]+$/
const HTTP_BETWEEN_WHITESPACE = /^[\u000a\u000d\u0009\u0020]*(.*?)[\u000a\u000d\u0009\u0020]*$/
/** @param {string} char */
function isHttpWhitespace (char) {
switch (char) {
case '\u0009':
case '\u000A':
case '\u000D':
case '\u0020':
return true
}
return false
}
/** @param {string} s */
function httpTrim (s) {
if (!isHttpWhitespace(s[0]) && !isHttpWhitespace(s[s.length - 1])) {
return s
}
const match = HTTP_BETWEEN_WHITESPACE.exec(s)
return match && match[1]
}
/**
* https://fetch.spec.whatwg.org/#concept-headers-append
* @param {Bag} bag
* @param {string} name
* @param {string} value
*/
function appendHeader (bag, name, value) {
value = httpTrim(`${value}`) || ''
if (!HTTP_TOKEN_CODE_POINT_RE.test(name)) {
throw new TypeError('Header name is not valid.')
}
if (ILLEGAL_VALUE_CHARS.test(value) || !IS_BYTE_STRING.test(value)) {
throw new TypeError(`Header value ${JSON.stringify(value)} is not valid.`)
}
if (bag.guard === 'immutable') {
throw new TypeError('Headers are immutable.')
}
name = String(name).toLocaleLowerCase()
bag.items[name] = name in bag.items ? `${bag.items[name]}, ${value}` : value
if (name === 'set-cookie') {
bag.cookies.push(value)
}
}
/** @param {string} name */
function normalizeName (name) {
name = `${name}`.toLowerCase()
if (!HTTP_TOKEN_CODE_POINT_RE.test(name)) throw new TypeError('Header name is not valid.')
return name
}
/** @type {WeakMap<Headers, Bag>} */
const wm = new WeakMap()
export class Headers {
/** @param {HeadersInit} [init] */
constructor (init = undefined) {
const bag = {
items: Object.create(null),
cookies: [],
guard: 'mutable'
}
wm.set(this, bag)
if (init !== undefined) {
fillHeaders(bag, init)
}
}
append (name, value) {
const bag = assert(this, arguments.length, 2, 'append')
appendHeader(bag, name, value)
}
delete (name) {
const bag = assert(this, arguments.length, 1, 'delete')
name = normalizeName(name)
delete bag.items[name]
if (name === 'set-cookie') bag.cookies.length = 0
}
get (name) {
const bag = assert(this, arguments.length, 1, 'get')
name = normalizeName(name)
return name in bag.items ? bag.items[name] : null
}
has (name) {
const bag = assert(this, arguments.length, 1, 'has')
return normalizeName(name) in bag.items
}
set (name, value) {
const bag = assert(this, arguments.length, 2, 'set')
this.delete(name)
appendHeader(bag, name, value)
}
forEach (callback, thisArg = globalThis) {
const bag = assert(this, arguments.length, 1, 'forEach')
if (typeof callback !== 'function') {
throw new TypeError(
"Failed to execute 'forEach' on 'Headers': parameter 1 is not of type 'Function'."
)
}
for (const x of this) {
callback.call(thisArg, x[1], x[0], this)
}
}
toString () {
return '[object Headers]'
}
getSetCookie () {
const bag = assert(this, 0, 0, '')
return bag.cookies.slice(0)
}
keys () {
assert(this, 0, 0, '')
return [...this].map(x => x[0]).values()
}
values () {
assert(this, 0, 0, '')
return [...this].map(x => x[1]).values()
}
entries () {
const bag = assert(this, 0, 0, '')
/** @type {Array<[string, string]>} */
const result = []
const entries = [
...Object.entries(bag.items).sort((a, b) => a[0] > b[0] ? 1 : -1)
]
for (const [name, value] of entries) {
if (name === 'set-cookie') {
for (const cookie of bag.cookies) {
result.push([name, cookie])
}
} else result.push([name, value])
}
return result.values()
}
[Symbol.iterator] () {
return this.entries()
}
[Symbol.for('nodejs.util.inspect.custom')] () {
const bag = assert(this, 0, 0, '')
class Headers extends URLSearchParams { }
return new Headers(bag.items)
}
}
export const bag = wm
const enumerable = { enumerable: true }
Object.defineProperties(Headers.prototype, {
append: enumerable,
delete: enumerable,
entries: enumerable,
forEach: enumerable,
get: enumerable,
getSetCookie: enumerable,
has: enumerable,
keys: enumerable,
set: enumerable,
values: enumerable
})