Bind fastify in validate

README.md

@@ -10,12 +10,13 @@
 npm i fastify-basic-auth
 ```
 ## Usage
-This plugin decorates the fastifyinstance with a `basicAuth` function, which you can use inside a `preHandler` hook, in a `beforeHander` or with [`fastify-auth`](https://github.com/fastify/fastify-auth).
+This plugin decorates the fastify instance with a `basicAuth` function, which you can use inside a `preHandler` hook, in a `beforeHander` or with [`fastify-auth`](https://github.com/fastify/fastify-auth).
 
 ```js
 const fastify = require('fastify')()
 
 fastify.register(require('fastify-basic-auth'), { validate })
+// `this` inside validate is `fastify`
 function validate (username, password, req, reply, done) {
   if (username === 'Tyrion' && password === 'wine') {
     done()

index.js

@@ -8,7 +8,7 @@ function basicPlugin (fastify, opts, next) {
     return next(new Error('Basic Auth: Missing validate function'))
   }
 
-  const validate = opts.validate
+  const validate = opts.validate.bind(fastify)
   fastify.decorate('basicAuth', basicAuth)
 
   next()

test.js

@@ -339,6 +339,45 @@ test('Missing header', t => {
   })
 })
 
+test('Fastify context', t => {
+  t.plan(3)
+
+  const fastify = Fastify()
+  fastify.decorate('test', true)
+  fastify.register(basicAuth, { validate })
+
+  function validate (username, password, req, res, done) {
+    t.ok(this.test)
+    if (username === 'user' && password === 'pwd') {
+      done()
+    } else {
+      done(new Error('Unauthorized'))
+    }
+  }
+
+  fastify.after(() => {
+    fastify.route({
+      method: 'GET',
+      url: '/',
+      beforeHandler: fastify.basicAuth,
+      handler: (req, reply) => {
+        reply.send({ hello: 'world' })
+      }
+    })
+  })
+
+  fastify.inject({
+    url: '/',
+    method: 'GET',
+    headers: {
+      authorization: basicAuthHeader('user', 'pwd')
+    }
+  }, (err, res) => {
+    t.error(err)
+    t.strictEqual(res.statusCode, 200)
+  })
+})
+
 function basicAuthHeader (username, password) {
   return 'Basic ' + Buffer.from(`${username}:${password}`).toString('base64')
 }