Merge pull request #482 from wumibals/strategy

auth strategy

Author: yusuftomilola

backend/src/auth/decorators/current-user.decorator.ts

@@ -0,0 +1,9 @@
+import { createParamDecorator, ExecutionContext } from '@nestjs/common';
+import { User } from '../../users/user.entity';
+
+export const CurrentUser = createParamDecorator(
+  (_data: unknown, ctx: ExecutionContext): User => {
+    const request = ctx.switchToHttp().getRequest();
+    return request.user;
+  },
+);

backend/src/auth/strategies/jwt.strategy.ts

@@ -0,0 +1,31 @@
+import { Injectable, UnauthorizedException } from '@nestjs/common';
+import { PassportStrategy } from '@nestjs/passport';
+import { ExtractJwt, Strategy } from 'passport-jwt';
+import { ConfigService } from '@nestjs/config';
+import { UsersService } from '../../users/users.service';
+
+export interface JwtPayload {
+  sub: string;
+  email: string;
+  role: string;
+}
+
+@Injectable()
+export class JwtStrategy extends PassportStrategy(Strategy) {
+  constructor(
+    private readonly configService: ConfigService,
+    private readonly usersService: UsersService,
+  ) {
+    super({
+      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
+      ignoreExpiration: false,
+      secretOrKey: configService.get<string>('JWT_SECRET', 'change-me-in-env'),
+    });
+  }
+
+  async validate(payload: JwtPayload) {
+    const user = await this.usersService.findById(payload.sub);
+    if (!user) throw new UnauthorizedException();
+    return user;
+  }
+}