feat(nitro): handle request body in workers (#537)

src/runtime/entries/cloudflare.ts

@@ -1,6 +1,7 @@
 import '#polyfill'
 import { getAssetFromKV } from '@cloudflare/kv-asset-handler'
 import { localCall } from '../server'
+import { requestHasBody, useRequestBody } from '../server/utils'
 
 const PUBLIC_PATH = process.env.PUBLIC_PATH // Default: /_nuxt/
 
@@ -17,6 +18,10 @@ async function handleEvent (event) {
 
   const url = new URL(event.request.url)
 
+  if (requestHasBody(event.request)) {
+    event.request.body = await useRequestBody(event.request)
+  }
+
   const r = await localCall({
     event,
     url: url.pathname + url.search,

src/runtime/entries/service-worker.ts

@@ -1,9 +1,9 @@
 // @ts-nocheck
 import '#polyfill'
 import { localCall } from '../server'
+import { requestHasBody, useRequestBody } from '../server/utils'
 
 const STATIC_ASSETS_BASE = process.env.NUXT_STATIC_BASE + '/' + process.env.NUXT_STATIC_VERSION
-const METHODS_WITH_BODY = ['POST', 'PUT', 'PATCH']
 
 addEventListener('fetch', (event: any) => {
   const url = new URL(event.request.url)
@@ -16,9 +16,10 @@ addEventListener('fetch', (event: any) => {
 })
 
 async function handleEvent (url, event) {
-  if (METHODS_WITH_BODY.includes(event.request.method.toUpperCase()) && !event.request.body) {
-    event.request.body = await event.request.text()
+  if (requestHasBody(event.request)) {
+    event.request.body = await useRequestBody(event.request)
   }
+
   const r = await localCall({
     event,
     url: url.pathname + url.search,

src/runtime/server/utils.ts

@@ -0,0 +1,26 @@
+const METHOD_WITH_BODY_RE = /post|put|patch/i
+const TEXT_MIME_RE = /application\/text|text\/html/
+const JSON_MIME_RE = /application\/json/
+
+export function requestHasBody (request: globalThis.Request) : boolean {
+  return METHOD_WITH_BODY_RE.test(request.method)
+}
+
+export async function useRequestBody (request: globalThis.Request): Promise<any> {
+  const contentType = request.headers.get('content-type') || ''
+  if (contentType.includes('form')) {
+    const formData = await request.formData()
+    const body = Object.create(null)
+    for (const entry of formData.entries()) {
+      body[entry[0]] = entry[1]
+    }
+    return body
+  } else if (JSON_MIME_RE.test(contentType)) {
+    return request.json()
+  } else if (TEXT_MIME_RE.test(contentType)) {
+    return request.text()
+  } else {
+    const blob = await request.blob()
+    return URL.createObjectURL(blob)
+  }
+}