[英]In nest.js, is it possible to get service instance inside a param decorator?
我想使用 nest.js 来实现这样的东西:(与 Spring 框架非常相似)
@Controller('/test')
class TestController {
@Get()
get(@Principal() principal: Principal) {
}
}
在阅读了几个小时的文档后,我发现 nest.js 支持创建自定义装饰器。 所以我决定实现我自己的@Principal
装饰器。 装饰器负责从 http 标头中检索访问令牌,并使用令牌从我自己的身份验证服务中获取用户的主体。
import { createParamDecorator } from '@nestjs/common';
export const Principal = createParamDecorator((data: string, req) => {
const bearerToken = req.header.Authorization;
// parse.. and call my authService..
// how to call my authService here?
return null;
});
但问题是我不知道如何在装饰器处理程序中获取我的服务实例。 是否可以? 如何? 先感谢您
无法将服务注入您的自定义装饰器。
相反,您可以创建一个AuthGuard
访问您的服务的AuthGuard
。 然后守卫可以向request
对象添加一个属性,然后您可以使用自定义装饰器访问该属性:
@Injectable()
export class AuthGuard implements CanActivate {
constructor(private authService: AuthService) {}
async canActivate(context: ExecutionContext): Promise<boolean> {
const request = context.switchToHttp().getRequest();
const bearerToken = request.header.Authorization;
const user = await this.authService.authenticate(bearerToken);
request.principal = user;
// If you want to allow the request even if auth fails, always return true
return !!user;
}
}
import { createParamDecorator } from '@nestjs/common';
export const Principal = createParamDecorator((data: string, req) => {
return req.principal;
});
然后在您的控制器中:
@Get()
@UseGuards(AuthGuard)
get(@Principal() principal: Principal) {
// ...
}
请注意,nest 提供了一些用于身份验证的标准模块,请参阅文档。
您可以对所有控制器使用中间件。
auth.middleware.ts
interface AccountData {
accId: string;
iat: number;
exp: number;
}
interface RequestWithAccountId extends Request {
accId: string;
}
@Injectable()
export class AuthMiddleware implements NestMiddleware {
constructor(private readonly authenticationService: AuthenticationService) {}
async use(req: RequestWithAccountId, res: Response, next: NextFunction) {
const token =
req.body.token || req.query.token || req.headers['authorization'];
if (!token) {
throw new UnauthorizedException();
}
try {
const {
accId,
}: AccountData = await this.authenticationService.verifyToken(token);
req.accId = accId;
next();
} catch (err) {
throw new UnauthorizedException();
}
}
}
然后创建 AccountId 装饰器
account-id.decorator.ts
import {
createParamDecorator,
ExecutionContext,
UnauthorizedException,
} from '@nestjs/common';
export const AccountId = createParamDecorator(
(data: unknown, ctx: ExecutionContext) => {
const req = ctx.switchToHttp().getRequest();
const token = req.accId;
if (!token) {
throw new UnauthorizedException();
}
return token;
},
);
然后在您的控制器中应用 AccountId 装饰器
your.controller.ts
@Get()
async someEndpoint(
@AccountId() accountId,
) {
console.log('accountId',accontId)
}
NestJS v7
创建自定义管道
// parse-token.pipe.ts
import { ArgumentMetadata, Injectable, PipeTransform } from '@nestjs/common';
import { AuthService } from './auth.service';
@Injectable()
export class ParseTokenPipe implements PipeTransform {
// inject any dependency
constructor(private authService: AuthService) {}
async transform(value: any, metadata: ArgumentMetadata) {
console.log('additional options', metadata.data);
return this.authService.parse(value);
}
}
将此管道与属性装饰器一起使用
// decorators.ts
import { createParamDecorator, ExecutionContext } from '@nestjs/common';
import { ParseTokenPipe} from './parse-token.pipe';
export const GetToken = createParamDecorator((data: unknown, ctx: ExecutionContext) => {
return ctx.switchToHttp().getRequest().header.Authorization;
});
export const Principal = (additionalOptions?: any) => GetToken(additionalOptions, ParseTokenPipe);
使用此装饰器有或没有其他选项
@Controller('/test')
class TestController {
@Get()
get(@Principal({hello: "world"}) principal) {}
}
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