Added expert field mirror flow

src/common/auth/guards/role.guard.ts

@@ -0,0 +1,47 @@
+import {
+  CanActivate,
+  ExecutionContext,
+  ForbiddenException,
+  Injectable,
+} from "@nestjs/common";
+import { Reflector } from "@nestjs/core";
+import { Request } from "express";
+import { IS_PUBLIC_KEY, ROLES_KEY } from "../decorators";
+import { Role } from "../enums";
+import { JwtPayload } from "../types";
+
+@Injectable()
+export class RolesGuard implements CanActivate {
+  constructor(private readonly reflector: Reflector) {}
+
+  canActivate(context: ExecutionContext): boolean {
+    const isPublic = this.reflector.getAllAndOverride<boolean>(IS_PUBLIC_KEY, [
+      context.getHandler(),
+      context.getClass(),
+    ]);
+    if (isPublic) return true;
+
+    const requiredRoles = this.reflector.getAllAndOverride<Role[]>(ROLES_KEY, [
+      context.getHandler(),
+      context.getClass(),
+    ]);
+
+    if (!requiredRoles || requiredRoles.length === 0) return true;
+
+    const request = context.switchToHttp().getRequest<Request>();
+    const user: JwtPayload = request["user"] as JwtPayload | undefined;
+
+    if (!user?.role) {
+      throw new ForbiddenException("No role found in token");
+    }
+
+    const hasRole = requiredRoles.includes(user.role as Role);
+    if (!hasRole) {
+      throw new ForbiddenException(
+        `Access denied. Required: [${requiredRoles.join(", ")}]. Your role: ${user.role}`,
+      );
+    }
+
+    return true;
+  }
+}