fix: add 501 error not implemented for range requests (#6)

Tracking adding this in storacha/gateway-lib#12

src/index.js

@@ -12,7 +12,7 @@ import {
   handleBlock,
   handleCar
 } from '@web3-storage/gateway-lib/handlers'
-import { withDagula, withCarCids } from './middleware.js'
+import { withDagula, withCarCids, withUnsupportedFeaturesHandler } from './middleware.js'
 
 /**
  * @typedef {import('./bindings').Environment} Environment
@@ -29,6 +29,7 @@ export default {
       withCorsHeaders,
       withContentDispositionHeader,
       withErrorHandler,
+      withUnsupportedFeaturesHandler,
       withHttpGet,
       withParsedIpfsUrl,
       withCarCids,

src/middleware.js

@@ -14,6 +14,22 @@ const CAR_CODE = 0x0202
  * @typedef {import('@web3-storage/gateway-lib').DagulaContext} DagulaContext
  */
 
+/**
+ * Validates the request does not contain unsupported features.
+ * Returns 501 Not Implemented in case it has.
+ * @type {import('@web3-storage/gateway-lib').Middleware<import('@web3-storage/gateway-lib').Context>}
+ */
+export function withUnsupportedFeaturesHandler (handler) {
+  return (request, env, ctx) => {
+    // Range request https://github.com/web3-storage/gateway-lib/issues/12
+    if (request.headers.get('range')) {
+      throw new HttpError('Not Implemented', { status: 501 })
+    }
+
+    return handler(request, env, ctx)
+  }
+}
+
 /**
  * Extracts CAR CIDs search params from the URL querystring or DUDEWHERE bucket.
  * @type {import('@web3-storage/gateway-lib').Middleware<CarCidsContext & IpfsUrlContext, IpfsUrlContext, Environment>}