Decorators

Create Decorator

• RolesDecorator

    @Roles(['admin'])

• Create RolesDecorator

    import { Reflector } from '@nestjs/core';

    export const Roles = Reflector.createDecorator<string[]>();

Usage

    @Post()
    @Roles(['admin'])
    async create(@Body() createCatDto: CreateCatDto) {

        this.catsService.create(createCatDto);

    }

RoleGuard

    import { Injectable, CanActivate, ExecutionContext } from '@nestjs/common';
    import { Reflector } from '@nestjs/core';
    import { Roles } from './roles.decorator';

    @Injectable()
    export class RolesGuard implements CanActivate {

        constructor(private reflector: Reflector) {}

        canActivate(context: ExecutionContext): boolean {

            const roles = this.reflector.get(Roles, context.getHandler());
        
            if (!roles) {
                return true;
            }

            const request = context.switchToHttp().getRequest();
            const user = request.user;
            return matchRoles(roles, user.roles);
        }
    }