@janiscommerce/api

API

A package for managing API from any origin.

Installation

npm install @janiscommerce/api

Client injection

The module can detect and inject a client. This works with configurable identifiers. The api can receive the identifier and an internal model will get an inject the client for you. The identifiers can be configurated with the package Settings in the key api.identifiers.

Active Client

For the client injection functionality si required to install the package active-client. The package active-client will get in DB by the field configurated in the identifiers and received in the api. For more information see Active Client

Examples of configuration in .janiscommercerc.json

1. In this case api will use the header 'client' getting in DB using the field name

{
	"api": {
		"identifiers": {
			"header": "client",
			"clientField": "name"
		}
	}
}

1. In this case api will search the client using client-id or client-code (sent in qs or requestBody), the field in DB is id and code respectively.

{
	"api": {
		"identifiers": [{
			"data": "client-id",
			"clientField": "id"
		}, {
			"data": "client-code",
			"clientField": "code"
		}]
	}
}

Public methods

• .dispatch() (async) This method dispatch the api instance. Returns an object with code and the body.

Usage

How to dispatch an API? (from a server)

const { Dispatcher } = require('@janiscommerce/api');

const dispatcher = new Dispatcher({
	endpoint: 'api/pets',
	method: 'get', // this is the default verb
	data: { status: 'active' },
	headers: { 'Content-Type': 'application/json' },
	cookies: { 'my-cookie': 123 }
});

const response = await dispatcher.dispatch();

console.log(response);
/**
	expected output:

	{
		code: 200,
		body: [
			{
				id: 1,
				type: 'dog',
				breed: 'pug',
				name: 'Batman'
			}, {
				id: 2,
				type: 'dog',
				breed: 'chihuahua',
				name: 'Chico'
			}
		]
	}
*/

API

You should extend your apis from this module.

Public methods

• pathParameters (getter). Returns the path parameters of the request.

• headers (getter). Returns the the headers of the request.

• cookies (getter). Returns the the cookies of the request.

• setCode(code). Set a response httpCode. code must be a integer.

• setHeader(headerName, headerValue). Set an individual response header. headerName must be a string.

• setHeaders(headers). Set response headers. headers must be an object with "key-value" headers.

• setCookie(cookieName, cookieValue). Set an individual response cookie. cookieName must be a string.

• setCookies(cookies). Set response cookies. cookies must be an object with "key-value" cookies.

• setBody(body). Set the response body.

• getInstance(ModuleClass). Get a module instance with client injected.

How to validate the API Structure (query string or request body)?

The API Struct is easily validated using superstruct (Thank's superstruct :pray:) If you want to use this validation, you should add a getter method struct().

const { API } = require('@janiscommerce/api');

class MyApi extends API {

	/**
	 * Optional method for struct validation (qs or requestBody)
	 */
	get struct() {
		return {
			id: 'number',
			name: 'string'
		};
	}
}

module.exports = MyApi;

How to add custom validation for my API?

The way to add some custom validation is adding a validate() method. This method is called by Dispatcher after validate de Struct.

const { API } = require('@janiscommerce/api');

class MyApi extends API {

	/**
	 * Optional method for extra validation
	 */
	async validate() {

		if(this.data.id > 10)
			throw new Error('Weird validation fail'); // this will response a 400 error

		if(!existsInMyDB(this.data.id)) {
			this.setCode(404); // set a custom http resposne code
			throw new Error('resource not found'); // this will response a 404 error
		}
	}
}

module.exports = MyApi;

How to process the API and response correctly?

const { API } = require('@janiscommerce/api');

class MyApi extends API {
	/**
	 * Required method for api process
	 */
	async process() {

		if(!saveInMyDB(this.data))
			throw new Error('internal save error'); // this will response a 500 error

		if(!saveOtherThingInMyDB(this.data)) {
			this.setCode(504); // set a custom http resposne code
			throw new Error('internal save error');
		}

		this
			.setHeader('my-header-1', 'foo')
			.setHeaders({ 'my-header-2': 'foo', 'my-header-3': 'foo' })
			.setCookie('my-cookie-1', 'bar')
			.setCookies({ 'my-cookie-2': 'bar', 'my-cookie-3': 'bar' })
			.setBody({
				'response-body': 123
			});
	}
}

module.exports = MyApi;

How to obtain a model instance with client injected

Is required to configure the api-identifiers and receive it in the API, see de Client injection and Active Client sections first.

const { API } = require('@janiscommerce/api');
const PetModel = require('/path/to/models/pet');

class MyApi extends API {
	/**
	 * Required method for api process
	 */
	async process() {

		const petModel = this.getInstance(PetModel);
		const petId = await petModel.save(this.data);

		this.setBody({ petId });
	}
}

module.exports = MyApi;