Allowed Methods

src/handler.ts

@@ -1,30 +1,30 @@
-import { timeNow } from './utils';
+import { allowedMethod, timeNow } from './utils';
 import serveResult from './helpers';
 
 export default async function checkCache(request: Request): Promise<Response> {
-  if (request.method === 'GET' || request.method === 'HEAD') {
-    const now = timeNow();
-    let cache = caches.default;
-    let response = await cache.match(request.url);
-    if (!response) {
-      response = await serveResult(request);
-      await cache.put(request.url, response.clone());
-    }
-    response = new Response(response.body, response);
-    response.headers.append('X-Response-Time', timeNow() - now);
-    return response;
-  } else {
-    return new Response(
-      JSON.stringify({
-        success: false,
-        message: 'Method not allowed'
-      }), 
-      {
-        status: 405,
-        headers: {
-          'Content-Type': 'application/json; charset=utf-8',
-        }
+  const now = timeNow();
+  if (allowedMethod.indexOf(request.method) === -1) {
+    return new Response(JSON.stringify({
+      success: false,
+      message: 'Method not allowed'
+    }), {
+      status: 405,
+      headers: {
+        'Allow': allowedMethod.join(', '),
+        'Access-Control-Allow-Origin': '*',
+        'Access-Control-Allow-Methods': allowedMethod.join(', '),
+        'Content-Type': 'application/json; charset=utf-8',
+        'X-Powered-By': '@ihsangan/valid'
       }
-    );
+    });
   }
+  let cache = caches.default;
+  let response = await cache.match(request.url);
+  if (!response) {
+    response = await serveResult(request);
+    await cache.put(request.url, response.clone());
+  }
+  response = new Response(response.body, response);
+  response.headers.set('X-Response-Time', timeNow() - now);
+  return response;
 }

src/helpers.ts

@@ -1,4 +1,4 @@
-import { getUrl, Result } from './utils';
+import { getUrl, Result, allowedMethod } from './utils';
 import callAPI from './routing';
 
 export default async function serveResult(request: Request): Promise<Response> {
@@ -21,7 +21,7 @@ export default async function serveResult(request: Request): Promise<Response> {
     status: code,
     headers: {
       'Access-Control-Allow-Origin': '*',
-      'Access-Control-Allow-Methods': 'GET, HEAD',
+      'Access-Control-Allow-Methods': allowedMethod.join(', '),
       'Access-Control-Expose-Headers': 'Age, X-Powered-By, X-Response-Time',
       'Age': 0,
       'CF-Cache-Status': 'MISS',

src/utils.ts

@@ -1,3 +1,7 @@
+export const endpoint = 'https://order-sg.codashop.com/initPayment.action';
+
+export const allowedMethod = ['GET', 'HEAD'];
+
 export function getUrl(request: Request): URL {
   return new URL(request.url);
 }
@@ -6,8 +10,6 @@ export function timeNow(): number {
   return Date.now();
 }
 
-export const endpoint = 'https://order-sg.codashop.com/initPayment.action';
-
 export const headers = new Headers({
   'Content-Type': 'application/x-www-form-urlencoded'
 });