koa-ts-decorator-router

You can via typescript class and decorator to difine your koa-router's routes middleware for Koa.

Features

You can define your koa-router's routes by es6 class. like this

@Controller({
  path: "user",
})
export class UserController {
  login({ name }: User) {
    console.log("param", name);
    return name;
  }

  @Method({
    path: "myRegister",
    method: "POST",
  })
  async register({ name, pass }: User) {
    const user = new User();
    user.name = name;
    user.pass = pass;
    await mysql().getRepository(User).save(user);
    return user;
  }
}

This will be transfer to koa-route like:

const Router = require("@koa/router");
const router = new Router();

router.get("/user/login", async (ctx, next) => {
  ctx.body = name; //name is abave class UserController login returned
  await next();
});

router.post("/user/myRegister", async (ctx, next) => {
  ctx.body = user;
  await next();
});

Installation

# npm ..
npm i koa-ts-decorator-router
# yarn ..
yarn add koa-ts-decorator-router

API

ClassifyKoaRouter ⏏

Kind: Exported function

Param	Type	Description
[router]	Object	instance of koa-router
[scanController]	Ojbect	scan controller config
[otherOpts]	Ojbect	other config

scanController Type

type ScanControllerOpts = {
  dirname: string; // your Controller ts file dir
  filter: RegExp; //filter you need regist to koa-router
};

otherOpts Type

type OtherOpts = {
  convertDigital?: boolean; // is try convert param string to number.
  assignQuery?: boolean; // is Object.assign ctx.request.query to ctx.request.body when body is Object type.
  logRoute?: boolean; // console.log register route, while you debug app you can turn on this config.
  /**
   * if return ture, will be call method. else not call method and ctx.body will be set to you function return value.
   *  */
  onBeforeCallMethod?: (
    ctx: ParameterizedContext,
    methodConf: {
      fullPath: string;
      method: MethodType;
      customConf?: T;
    },
  ) => unknown;
};

Controller Decorator ([controllerDecoratorOpts])

controllerDecoratorOpts Type

type ControllerDecoratorConf = {
  path?: string;
};

• Notice: if you not offer path, while register koa-route will it default value will be /.

@Path(path:string)

this decorator can use for controller and method.

@GET(path?:string)

@POST(path?:string)

@PUT(path?:string)

@PATCH(path?:string)

@DELETE(path?:string)

@ALL(path?:string)

@CustomConf(customConf:T)

Controller Method Decorator ([methodDecoratorOpts])

type MethodDecoratorConf<T> = {
  path?: string;
  method?: MethodType;
  customConf?: T;
  rateLimitInstance?: RateLimiterStoreAbstract;
  rateLimitConsumeFn?: {
    (
      rateLimitInstance: RateLimiterStoreAbstract,
      ctx: Koa.ParameterizedContext,
    ): Promise<any>;
  };
};

If you offer RateLimiterStoreAbstract, and rateLimitConsumeFn you can define you function to consume rateLimit.

Controller 's path and Method's path composition to koa-route's path.

eg1:

export class UserController {
  login({ name }: User) {
    console.log("param", name);
    return name;
  }
}

koa-route will be router.get(/login)

eg2:

@Controller({
  path: "user",
})
export class UserController {
  login({ name }: User) {
    console.log("param", name);
    return name;
  }
}

koa-route will be router.get(/user/login)

eg3:

export class UserController {
  @Method({
    method: "POST",
  })
  login({ name }: User) {
    console.log("param", name);
    return name;
  }
}

koa-route will be router.post(/login)

eg5:

@Controller({
  path: "////user//",
})
export class UserController {
  @Method({
    method: "POST",
    path: "//login////",
  })
  login({ name }: User) {
    console.log("param", name);
    return name;
  }
}

koa-route will be router.post(/user/login)

eg6:

@Controller({
  path: "user",
})
export class UserController {
  @Method({
    method: "POST",
    path: "login/:id",
  })
  login({ name }: User) {
    console.log("param", name);
    return name;
  }
}

koa-route will be router.post(/user/login/:id)

Controller Method Param

• request.body is Array, It will be call login(request.body, ctx.request, router)
• request.body is Object, And if otherOpt assignQuery is ture . It will be call login(Object.assign(request.body,request.query), ctx.request, router)
• If method First param is Array or Object, And if otherOpt convertDigital is true. we will try to auto recursion transform param value, convert string to number or float.

Example
Basic usage:

The directory structure

.
├── controllers
│   ├── FileController.ts
│   └── UserController.ts
├── index.ts

index.ts

import Koa from "koa";
import Router from "koa-router";
import KoaBody from "koa-body";

app.use(
  KoaBody({
    multipart: true,
  }),
);

const router = new Router();

app.use(
  ClassifyKoaRouter(router, {
    dirname: path.join(__dirname + "./controllers"), // your Controller ts file dir
    filter: /(.*Controller)\.ts$/, //filter you need regist to koa-router
  }),
);

UserController.ts

@Controller({
  path: "user",
})
export class UserController {
  login({ name }: User) {
    console.log("param", name);
    return name;
  }

  @Method({
    path: "myRegister",
    method: "POST",
  })
  async register({ name, pass }: User) {
    const user = new User();
    user.name = name;
    user.pass = pass;
    await mysql().getRepository(User).save(user);
    return user;
  }
}

Upload usage:

FileController

@Controller({
  path: "file",
})
export class FileController {
  @Method({
    method: "POST",
  })
  upload(params: any, { files }: { files: Files }) {
    return saveFiles(files).map((i) => {
      delete i.filePath;
      return i;
    });
  }
}

Notice

• Use this lib must be cooperation with koa-body and koa-router.

• Because lib use typescript decorator, you need allow options at tsconfig.json

"experimentalDecorators": true, /* Enables experimental support for ES7 decorators. */
"emitDecoratorMetadata": true, /* Enables experimental support for emitting type metadata for decorators. */

Contributing

Please submit all issues and pull requests to the hxdyj/koa-ts-decorator-router repository!

Support

If you have any problem or suggestion please open an issue here.

License

MIT