book_manage/apps/server/src/auth/auth.guard.ts

import {
    CanActivate,
    ExecutionContext,
    Injectable,
    UnauthorizedException,
} from '@nestjs/common';
import { JwtService } from '@nestjs/jwt';
import { env } from '@server/env';

import { JwtPayload } from '@nicestack/common';
import { extractTokenFromHeader } from './utils';

@Injectable()
export class AuthGuard implements CanActivate {
    constructor(private jwtService: JwtService) { }
    async canActivate(context: ExecutionContext): Promise<boolean> {
        const request = context.switchToHttp().getRequest();
        const token = extractTokenFromHeader(request);

        if (!token) {
            throw new UnauthorizedException();
        }
        try {
            const payload: JwtPayload = await this.jwtService.verifyAsync(
                token,
                {
                    secret: env.JWT_SECRET
                }
            );

            // 💡 We're assigning the payload to the request object here
            // so that we can access it in our route handlers
            request['user'] = payload;
        } catch {
            throw new UnauthorizedException();
        }
        return true;
    }

  
}