chore: enable disable rewrite for apiv2 selfhost (calcom#21742)

Author: ThyMinimalDev

apps/api/v2/.env.example

@@ -37,4 +37,8 @@ AXIOM_TOKEN=
 # INFO: 1
 # WARN: 2
 # ERROR: 3
-LOGGER_BRIDGE_LOG_LEVEL="1"
+LOGGER_BRIDGE_LOG_LEVEL="1"
+
+# 1: Rewrite /api/v2 to /v2
+# 0: Don't rewrite
+REWRITE_API_V2_PREFIX="1"

apps/api/v2/src/env.ts

@@ -32,6 +32,8 @@ export type Environment = {
   AXIOM_TOKEN: string;
   STRIPE_TEAM_MONTHLY_PRICE_ID: string;
   IS_TEAM_BILLING_ENABLED: boolean;
+  // Used to enable/disable the rewrite of /api/v2 to /v2, active by default.
+  REWRITE_API_V2_PREFIX: string;
 };
 
 export const getEnv = <K extends keyof Environment>(key: K, fallback?: Environment[K]): Environment[K] => {

apps/api/v2/src/middleware/app.rewrites.middleware.ts

@@ -1,10 +1,11 @@
+import { getEnv } from "@/env";
 import { Injectable, NestMiddleware } from "@nestjs/common";
 import { Request, Response } from "express";
 
 @Injectable()
 export class RewriterMiddleware implements NestMiddleware {
   use(req: Request, res: Response, next: () => void) {
-    if (req.url.startsWith("/api/v2")) {
+    if (shouldRewriteApiV2Prefix() && req.url.startsWith("/api/v2")) {
       req.url = req.url.replace("/api/v2", "/v2");
     }
     if (req.url.startsWith("/v2/ee")) {
@@ -16,3 +17,12 @@ export class RewriterMiddleware implements NestMiddleware {
     next();
   }
 }
+
+const shouldRewriteApiV2Prefix = () => {
+  try {
+    // rewrite is active even if REWRITE_API_V2_PREFIX is not set
+    return getEnv("REWRITE_API_V2_PREFIX", "1") === "1";
+  } catch (error) {
+    return true;
+  }
+};