add AsyncOriginFunction type

types/index.d.ts

@@ -23,6 +23,7 @@ type FastifyCorsHook =
 
 declare namespace fastifyCors {
   export type OriginFunction = (origin: string | undefined, callback: OriginCallback) => void;
+  export type AsyncOriginFunction = (origin: string | undefined) => Promise<ValueOrArray<OriginType>>;
 
   export interface FastifyCorsOptions {
     /**
@@ -38,7 +39,7 @@ declare namespace fastifyCors {
     /**
      * Configures the Access-Control-Allow-Origin CORS header.
      */
-    origin?: ValueOrArray<OriginType> | fastifyCors.OriginFunction;
+    origin?: ValueOrArray<OriginType> | fastifyCors.AsyncOriginFunction | fastifyCors.OriginFunction;
     /**
      * Configures the Access-Control-Allow-Credentials CORS header.
      * Set to true to pass the header, otherwise it is omitted.

types/index.test-d.ts

@@ -1,6 +1,7 @@
 import fastify, { FastifyRequest } from 'fastify'
 import { expectType } from 'tsd'
 import fastifyCors, {
+  AsyncOriginFunction,
   FastifyCorsOptions,
   FastifyCorsOptionsDelegate,
   FastifyCorsOptionsDelegatePromise,
@@ -117,6 +118,26 @@ app.register(fastifyCors, {
   strictPreflight: false
 })
 
+const asyncCorsDelegate: OriginFunction = async (origin) => {
+  if (origin === undefined || /localhost/.test(origin)) {
+    return true;
+  }
+  return false;
+}
+
+app.register(fastifyCors, {
+  origin: asyncCorsDelegate,
+  allowedHeaders: ['authorization', 'content-type'],
+  methods: ['GET', 'POST', 'PUT', 'PATCH', 'DELETE', 'OPTIONS'],
+  credentials: true,
+  exposedHeaders: ['authorization'],
+  maxAge: 13000,
+  cacheControl: 13000,
+  optionsSuccessStatus: 200,
+  preflight: false,
+  strictPreflight: false
+})
+
 app.register(fastifyCors, {
   origin: (origin, cb) => cb(null, true)
 })
@@ -349,7 +370,18 @@ appHttp2.register(fastifyCors, delegate)
 
 appHttp2.register(fastifyCors, {
   hook: 'preParsing',
-  origin: function (origin) {
+  origin: function (origin, cb) {
     expectType<string|undefined>(origin)
+    cb(null, false)
   },
 })
+
+const asyncOriginFn: AsyncOriginFunction = async function (origin): Promise<boolean>  {
+  expectType<string|undefined>(origin)
+  return false;
+};
+
+appHttp2.register(fastifyCors, {
+  hook: 'preParsing',
+  origin: asyncOriginFn,
+})