feat(middleware): (#31)

- allow to call the middleware without a response object

Author: thib3113

packages/crowdsec-http-middleware/readme.md

@@ -104,6 +104,7 @@ const middlewareOptions: ICrowdSecHTTPMiddlewareOptions = {
     },
     // here, an optional function to extract Ip from request
     // you can also use a scenario with "extractIp" capability
+    // getCurrentIp is prior to scenarios extractIp . If you want to use a default function, create a scenario with only extractIp
     getCurrentIp: (req: IncomingMessage) => req.socket.remoteAddress || '0.0.0.0',
     //we will see this configurations later
     watcher: watcherOptions,

packages/crowdsec-http-middleware/src/CrowdSecHTTPMiddleware.ts

@@ -88,7 +88,7 @@ export class CrowdSecHTTPMiddleware extends CommonsMiddleware {
         return this.ipObjectCache.getIpObjectWithCache(ip);
     }
 
-    protected middlewareFunction = (req: IncomingMessage, res: ServerResponse) => {
+    protected middlewareFunction = (req: IncomingMessage, res?: ServerResponse) => {
         const currentIp = this.getIpObjectFromReq(req);
 
         if (!currentIp.addressMinusSuffix) {
@@ -101,7 +101,7 @@ export class CrowdSecHTTPMiddleware extends CommonsMiddleware {
 
         this.watcher?.middleware(currentIp.addressMinusSuffix, req);
 
-        if (this.options.protectedByHeader) {
+        if (this.options.protectedByHeader && res) {
             res.appendHeader('X-Protected-By', 'CrowdSec');
         }
     };