如何在JWTStrategy (NestJS)中获取用户JWT令牌？

npm install passport passport-jwt @nestjs/passport @nestjs/jwt

// auth/jwt.strategy.ts
import { Injectable } from '@nestjs/common';
import { PassportStrategy } from '@nestjs/passport';
import { ExtractJwt, Strategy } from 'passport-jwt';

@Injectable()
export class JwtStrategy extends PassportStrategy(Strategy) {
  constructor() {
    super({
      jwtFromRequest: ExtractJwt.fromAuthHeaderAsBearerToken(),
      ignoreExpiration: false,
      secretOrKey: 'your_jwt_secret', // 替换为你的JWT密钥
    });
  }

  async validate(payload: any) {
    return { userId: payload.sub, username: payload.username };
  }
}

// auth/jwt.module.ts
import { Module } from '@nestjs/common';
import { PassportModule } from '@nestjs/passport';
import { JwtModule } from '@nestjs/jwt';
import { JwtStrategy } from './jwt.strategy';

@Module({
  imports: [
    PassportModule.register({ defaultStrategy: 'jwt' }),
    JwtModule.register({
      secret: 'your_jwt_secret', // 替换为你的JWT密阁
      signOptions: { expiresIn: '1h' },
    }),
  ],
  providers: [JwtStrategy],
})
export class AuthModule {}

// some-route.guard.ts
import { Injectable } from '@nestjs/common';
import { CanActivate, ExecutionContext, UnauthorizedException } from '@nestjs/common';
import { Reflector } from '@nestjs/core';
import { GqlExecutionContext } from '@nestjs/graphql';
import { PassportAuthenticationGuard } from './passport-authentication.guard';

@Injectable()
export class SomeRouteGuard extends PassportAuthenticationGuard implements CanActivate {
  constructor(private reflector: Reflector) {
    super();
  }

  canActivate(context: ExecutionContext): boolean | Promise<boolean> {
    const ctx = GqlExecutionContext.create(context);
    const request = ctx.getContext().req;

    const token = this.reflector.get('auth', context.getHandler());
    if (!token) {
      throw new UnauthorizedException();
    }

    // 这里可以访问到JWT令牌
    console.log('JWT Token:', request.headers.authorization.split(' ')[1]);

    return super.canActivate(context);
  }
}