依赖oak，模拟nestjs部分注解功能

运行样例

deno run --allow-net  --allow-env  example/main.ts

或者使用denon：

denon dev

Demo

Controller

可使用注解Controller、UseGuards、Get、Post、Body、Headers、Query、Res、Req：

import {
  Controller,
  ForbiddenException,
  Get,
  Post,
  UseGuards,
  Body,
  createParamDecorator,
  Headers,
  Query,
  Res,
} from "https://deno.land/x/oak_nest/mod.ts";
import type { CanActivate } from "https://deno.land/x/oak_nest/mod.ts";
import { Context } from "https://deno.land/x/oak/mod.ts";
import mockjs from "https://deno.land/x/deno_mock@v2.0.0/mod.ts";
import { delay } from "https://deno.land/std/async/mod.ts";

class AuthGuard implements CanActivate {
  async canActivate(context: Context): Promise<boolean> {
    console.log("--AuthGuard---");
    await delay(100);
    // throw new ForbiddenException('这是AuthGuard错误信息');
    return true;
  }
}

class AuthGuard2 implements CanActivate {
  async canActivate(context: Context): Promise<boolean> {
    console.log("--AuthGuard2---");
    return true;
  }
}

class AuthGuard3 implements CanActivate {
  async canActivate(context: Context): Promise<boolean> {
    throw new ForbiddenException("这是AuthGuard3错误信息");
    return false;
  }
}

@UseGuards(AuthGuard)
@Controller("/user")
export class UserController {
  @UseGuards(AuthGuard2, AuthGuard3)
  @Get("/info/:id")
  test(
    context: Context,
    @add() name: string,
    @Query() params: any,
    @Query("age") age: string,
  ) {
    console.log(params, age);
    context.response.body = "role info " + name + " - " +
      JSON.stringify(params);
  }

  @Get("/info")
  getInfo(@Res() res: Response, @Query() params: any) {
    console.log(params);
    res.body = "role get info " + JSON.stringify(params);
  }

  @Get("list")
  list(context: Context) {
    console.log("---list----");
    this.testInnerCall();
    context.response.body = "list";
  }

  testInnerCall() {
    console.log("---test---");
  }
}

可以自定义注解：

function Add() {
  return createParamDecorator(async (ctx: any) => {
    const result = ctx.request.body(); // content type automatically detected
    if (result.type === "json") {
      const value = await result.value; // an object of parsed JSON
      // console.log('value', value);
      return value.userId;
    }
  });
}

然后使用：

@Post("/info")
info(
  @Add() name: string,
  @Body() params: any,
  @Headers() headers: any,
  @Headers("host") host: any,
  @Res() res: Response,
) {
  console.log("ctx", name, params, headers, host);
  res.body = "role info " + name;
}

router注册Controller

import { UserController } from "./user.controller.ts";
import { Router } from "https://deno.land/x/oak_nest/mod.ts";

const router = new Router();
router.add(UserController);
router.setGlobalPrefix("api");

在app中使用router

import {
  Application,
  isHttpError,
  send,
  Status,
} from "https://deno.land/x/oak/mod.ts";
import router from "./router/index.ts";

const app = new Application();

// Timing
app.use(async (ctx, next) => {
  const start = Date.now();
  await next();
  const ms = Date.now() - start;
  ctx.response.headers.set("X-Response-Time", `${ms}ms`);
});

app.use(router.routes());

const port = Number(Deno.env.get("PORT") || 1000);
console.log(`app will start with: http://localhost:${port}`);
await app.listen({ port });

这时，你可以访问http://localhost:1000/api/user/info,http://localhost:1000/api/user/list。