Re-implement authentication (#136)

* Remove hasura and hasura-auth

* Implement authentication

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

@@ -0,0 +1,30 @@
+import { ExtractJwt, Strategy } from 'passport-jwt';
+import { PassportStrategy } from '@nestjs/passport';
+import { Injectable } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
+
+export type JwtPayload = { sub: number; username: string };
+
+@Injectable()
+export class JwtAuthStrategy extends PassportStrategy(Strategy, 'jwt') {
+  constructor(configService: ConfigService) {
+    const extractJwtFromCookie = (req) => {
+      let token = null;
+
+      if (req && req.cookies) {
+        token = req.cookies['jwt'];
+      }
+      return token;
+    };
+    
+    super({
+      jwtFromRequest: extractJwtFromCookie,
+      ignoreExpiration: false,
+      secretOrKey: configService.get<string>('JWT_SECRET'),
+    });
+  }
+
+  async validate(payload: JwtPayload) {
+    return { id: payload.sub, username: payload.username };
+  }
+}