From 8be8475fa60926a5295c7bf07665f6eb626c1075 Mon Sep 17 00:00:00 2001
From: Brenden Palmer <brendenpalmer@gmail.com>
Date: Mon, 17 Jul 2023 02:19:03 -0400
Subject: [PATCH] fix: detect Express/Fastify requests correctly as of Fastify
 v4.19.0 (#672)

---
 src/decorator.spec.ts |  1 +
 src/decorator.ts      | 19 ++++++++++++++-----
 2 files changed, 15 insertions(+), 5 deletions(-)

diff --git a/src/decorator.spec.ts b/src/decorator.spec.ts
index f22499b..e84ba05 100644
--- a/src/decorator.spec.ts
+++ b/src/decorator.spec.ts
@@ -41,6 +41,7 @@ function fastifyContextFactory(query: FastifyRequest['query']): Partial<Executio
                         protocol: 'http',
                         hostname: 'localhost',
                         url: '/items?search=2423',
+                        originalUrl: '/items?search=2423',
                         query: query,
                     }),
             }),
diff --git a/src/decorator.ts b/src/decorator.ts
index 6687245..6ad3d7b 100644
--- a/src/decorator.ts
+++ b/src/decorator.ts
@@ -1,7 +1,16 @@
 import { createParamDecorator, ExecutionContext } from '@nestjs/common'
-import { Request } from 'express'
+import type { Request as ExpressRequest } from 'express'
+import type { FastifyRequest } from 'fastify'
 import { pickBy, Dictionary, isString, mapKeys } from 'lodash'
 
+function isRecord(data: unknown): data is Record<string, unknown> {
+    return data !== null && typeof data === 'object' && !Array.isArray(data)
+}
+
+function isExpressRequest(request: unknown): request is ExpressRequest {
+    return isRecord(request) && typeof request.get === 'function'
+}
+
 export interface PaginateQuery {
     page?: number
     limit?: number
@@ -41,12 +50,12 @@ function parseParam<T>(queryParam: unknown, parserLogic: (param: string, res: an
 }
 
 export const Paginate = createParamDecorator((_data: unknown, ctx: ExecutionContext): PaginateQuery => {
-    const request: Request = ctx.switchToHttp().getRequest()
-    const { query } = request
+    const request: ExpressRequest | FastifyRequest = ctx.switchToHttp().getRequest()
+    const query = request.query as Record<string, unknown>
 
     // Determine if Express or Fastify to rebuild the original url and reduce down to protocol, host and base url
-    let originalUrl: any
-    if (request.originalUrl) {
+    let originalUrl: string
+    if (isExpressRequest(request)) {
         originalUrl = request.protocol + '://' + request.get('host') + request.originalUrl
     } else {
         originalUrl = request.protocol + '://' + request.hostname + request.url