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bloglist_backend/controllers/login.js

+const jwt = require('jsonwebtoken')
+const bcrypt = require('bcrypt')
+const loginRouter = require('express').Router()
+const User = require('../models/user')
+
+loginRouter.post('/', async (request, response) => {
+  const { username, password } = request.body
+
+  const user = await User.findOne({ username })
+  const passwordCorrect = user === null
+    ? false
+    : await bcrypt.compare(password, user.passwordHash)
+
+  if (!(user && passwordCorrect)) {
+    return response.status(401).json({
+      error: 'invalid username or password'
+    })
+  }
+
+  const userForToken = {
+    username: user.username,
+    id: user._id,
+  }
+
+  const token = jwt.sign(userForToken, process.env.SECRET)
+
+  response
+    .status(200)
+    .send({ token, username: user.username, name: user.name })
+})
+
+module.exports = loginRouter
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