feat: rewrite as a library

.gitignore

@@ -1,3 +1,4 @@
 node_modules
-src/db/*.json
+__tests__/*.json
 .env
+coverage

README.md

@@ -3,54 +3,69 @@
 
 Basically a very limited version of what [keygen.sh](https://keygen.sh/) does.
 
-[![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
+[![npm](https://img.shields.io/npm/v/authkey.svg)](https://www.npmjs.com/package/authkey)
 [![Build Status](https://travis-ci.org/adekbadek/authkey.svg?branch=master)](https://travis-ci.org/adekbadek/authkey)
+[![JavaScript Style Guide](https://img.shields.io/badge/code_style-standard-brightgreen.svg)](https://standardjs.com)
 
-## Installing / Getting started
+## Quick start
 
-### Setting up dev
+1. get an API key from [mailgun](https://www.mailgun.com/)
 
-```shell
-git clone https://github.com/adekbadek/authkey.git
-cd authkey/
-npm i
-npm run dev
-```
+1. install
 
-Set up env variables by creating `.env` file (see `.env-example`). You'll need a [mailgun](https://www.mailgun.com/) account for some of them.
+  ```shell
+  npm i authkey
+  ```
 
-Will install the dependencies and run development server.
+1. use
 
-### Running in production environment
+  ```javascript
+  const authkey = require('authkey')
 
-```shell
-npm start
-```
+  authkey({
+    mailgun: {
+      apiKey: 'api-619723461238973480',
+      domain: 'mydomain.com',
+    },
+    productName: 'SuperThing',
+  }).listen()
+  ```
+
+## API Reference
+
+| verb | endpoint       | what it does     |
+| :------------- | :------------- | :------------- |
+| `POST` | `/request/:address` | creates a new auth key for the given address and sends an email with the auth key |
+| `POST` | `/verify/:authkey` | verifies the given auth key |
+
+## Database
+
+a JSON file handled with [lowdb](https://github.com/typicode/lowdb)
 
 ## Versioning
 
 [SemVer](http://semver.org/) is used (with help of [semantic-release](https://github.com/semantic-release/semantic-release)).
-For the versions available, see the [link to tags on this repository](/tags).
+For the versions available, see the [releases](/releases).
 
-## Tests
-
-with [Jest](https://facebook.github.io/jest/)
+## Contributing
 
 ```shell
-npm t
+git clone https://github.com/adekbadek/authkey.git
+cd authkey/
+npm i
+npm run dev
 ```
 
-## Style guide
+Will install the dependencies and run development server.
 
-using [Standard](https://standardjs.com/)
+### Tests
 
-## Api Reference
+with [Jest](https://facebook.github.io/jest/)
 
-| verb | endpoint       | what it does     |
-| :------------- | :------------- | :------------- |
-| `POST` | `/request/:address` | creates a new auth key for the given address and sends an email with the auth key |
-| `POST` | `/verify/:authkey` | verifies the given auth key |
+```shell
+npm t
+```
 
-## Database
+### Style guide
 
-a JSON file handled with [lowdb](https://github.com/typicode/lowdb)
+using [Standard](https://standardjs.com/)

__tests__/server.js

@@ -2,15 +2,24 @@ require('dotenv').config()
 
 const request = require('supertest')
 
-const app = require('../src/server.js')
+const authkey = require('../src/server.js')
+
+const instance = authkey({
+  mailgun: {
+    apiKey: process.env.MAILGUN_API_KEY,
+    domain: process.env.MAILGUN_DOMAIN,
+  },
+  productName: process.env.PRODUCT_NAME,
+  dbFile: '__tests__/db.json',
+})
 
 describe('POST /request/:address', () => {
   it('should respond with 200 to valid address', async () => {
-    const response = await request(app).post('/request/something@mail.com')
+    const response = await request(instance).post('/request/something@mail.com')
     expect(response.statusCode).toBe(200)
   })
   it('should respond with 400 to invalid address', async () => {
-    const response = await request(app).post('/request/whatever')
+    const response = await request(instance).post('/request/whatever')
     expect(response.statusCode).toBe(400)
   })
 })

index.js

@@ -1,9 +1,12 @@
-require('dotenv').config()
+const server = require('./src/server')
 
-const app = require('./src/server')
-
-const PORT = 3000
-
-app.listen(PORT, () => {
-  console.log(`listening on port ${PORT}`)
-})
+module.exports = ({
+  port = 3000,
+  ...config
+}) => {
+  return ({
+    listen: () => server(config).listen(port, () => {
+      console.log(`listening on port ${port}`)
+    }),
+  })
+}