1 files changed, 151 insertions, 0 deletions
diff --git a/lib/fetch/constants.js b/lib/fetch/constants.js
new file mode 100644
index 0000000..218fcbe
--- /dev/null
+++ b/lib/fetch/constants.js
@@ -0,0 +1,151 @@
+'use strict'
+
+const { MessageChannel, receiveMessageOnPort } = require('worker_threads')
+
+const corsSafeListedMethods = ['GET', 'HEAD', 'POST']
+const corsSafeListedMethodsSet = new Set(corsSafeListedMethods)
+
+const nullBodyStatus = [101, 204, 205, 304]
+
+const redirectStatus = [301, 302, 303, 307, 308]
+const redirectStatusSet = new Set(redirectStatus)
+
+// https://fetch.spec.whatwg.org/#block-bad-port
+const badPorts = [
+  '1', '7', '9', '11', '13', '15', '17', '19', '20', '21', '22', '23', '25', '37', '42', '43', '53', '69', '77', '79',
+  '87', '95', '101', '102', '103', '104', '109', '110', '111', '113', '115', '117', '119', '123', '135', '137',
+  '139', '143', '161', '179', '389', '427', '465', '512', '513', '514', '515', '526', '530', '531', '532',
+  '540', '548', '554', '556', '563', '587', '601', '636', '989', '990', '993', '995', '1719', '1720', '1723',
+  '2049', '3659', '4045', '5060', '5061', '6000', '6566', '6665', '6666', '6667', '6668', '6669', '6697',
+  '10080'
+]
+
+const badPortsSet = new Set(badPorts)
+
+// https://w3c.github.io/webappsec-referrer-policy/#referrer-policies
+const referrerPolicy = [
+  '',
+  'no-referrer',
+  'no-referrer-when-downgrade',
+  'same-origin',
+  'origin',
+  'strict-origin',
+  'origin-when-cross-origin',
+  'strict-origin-when-cross-origin',
+  'unsafe-url'
+]
+const referrerPolicySet = new Set(referrerPolicy)
+
+const requestRedirect = ['follow', 'manual', 'error']
+
+const safeMethods = ['GET', 'HEAD', 'OPTIONS', 'TRACE']
+const safeMethodsSet = new Set(safeMethods)
+
+const requestMode = ['navigate', 'same-origin', 'no-cors', 'cors']
+
+const requestCredentials = ['omit', 'same-origin', 'include']
+
+const requestCache = [
+  'default',
+  'no-store',
+  'reload',
+  'no-cache',
+  'force-cache',
+  'only-if-cached'
+]
+
+// https://fetch.spec.whatwg.org/#request-body-header-name
+const requestBodyHeader = [
+  'content-encoding',
+  'content-language',
+  'content-location',
+  'content-type',
+  // See https://github.com/nodejs/undici/issues/2021
+  // 'Content-Length' is a forbidden header name, which is typically
+  // removed in the Headers implementation. However, undici doesn't
+  // filter out headers, so we add it here.
+  'content-length'
+]
+
+// https://fetch.spec.whatwg.org/#enumdef-requestduplex
+const requestDuplex = [
+  'half'
+]
+
+// http://fetch.spec.whatwg.org/#forbidden-method
+const forbiddenMethods = ['CONNECT', 'TRACE', 'TRACK']
+const forbiddenMethodsSet = new Set(forbiddenMethods)
+
+const subresource = [
+  'audio',
+  'audioworklet',
+  'font',
+  'image',
+  'manifest',
+  'paintworklet',
+  'script',
+  'style',
+  'track',
+  'video',
+  'xslt',
+  ''
+]
+const subresourceSet = new Set(subresource)
+
+/** @type {globalThis['DOMException']} */
+const DOMException = globalThis.DOMException ?? (() => {
+  // DOMException was only made a global in Node v17.0.0,
+  // but fetch supports >= v16.8.
+  try {
+    atob('~')
+  } catch (err) {
+    return Object.getPrototypeOf(err).constructor
+  }
+})()
+
+let channel
+
+/** @type {globalThis['structuredClone']} */
+const structuredClone =
+  globalThis.structuredClone ??
+  // https://github.com/nodejs/node/blob/b27ae24dcc4251bad726d9d84baf678d1f707fed/lib/internal/structured_clone.js
+  // structuredClone was added in v17.0.0, but fetch supports v16.8
+  function structuredClone (value, options = undefined) {
+    if (arguments.length === 0) {
+      throw new TypeError('missing argument')
+    }
+
+    if (!channel) {
+      channel = new MessageChannel()
+    }
+    channel.port1.unref()
+    channel.port2.unref()
+    channel.port1.postMessage(value, options?.transfer)
+    return receiveMessageOnPort(channel.port2).message
+  }
+
+module.exports = {
+  DOMException,
+  structuredClone,
+  subresource,
+  forbiddenMethods,
+  requestBodyHeader,
+  referrerPolicy,
+  requestRedirect,
+  requestMode,
+  requestCredentials,
+  requestCache,
+  redirectStatus,
+  corsSafeListedMethods,
+  nullBodyStatus,
+  safeMethods,
+  badPorts,
+  requestDuplex,
+  subresourceSet,
+  badPortsSet,
+  redirectStatusSet,
+  corsSafeListedMethodsSet,
+  safeMethodsSet,
+  forbiddenMethodsSet,
+  referrerPolicySet
+}