Add API endpoint to expire and create new API key

CHANGELOG.md

@@ -1,3 +1,4 @@
+* Add API endpoint to expire and create new API key [Pablo]
 * Enable control of API poll interval through Device Variables [Praneeth]
 * Allow control of VPN + TCP check + Pub nub logs with Device Environment variables [Praneeth]
 * Add GO api for openvpn control [Praneeth]

src/api.coffee

@@ -7,15 +7,21 @@ express = require 'express'
 bodyParser = require 'body-parser'
 request = require 'request'
 config = require './config'
+device = require './device'
 
-module.exports = (secret, application) ->
+module.exports = (application) ->
 	api = express()
 	api.use(bodyParser())
 	api.use (req, res, next) ->
+		utils.getOrGenerateApiSecret()
+		.then (secret) ->
 			if req.query.apikey is secret
 				next()
 			else
 				res.sendStatus(401)
+		.catch (err) ->
+			# This should never happen...
+			res.status(503).send('Invalid API key in supervisor')
 
 	api.get '/ping', (req, res) ->
 		res.send('OK')
@@ -120,4 +126,14 @@ module.exports = (secret, application) ->
 		.catch (err) ->
 			res.status(503).send(err?.message or err or 'Unknown error')
 
+	# Expires the supervisor's API key and generates a new one.
+	# It also communicates the new key to the Resin API.
+	api.post '/v1/regenerate-api-key', (req, res) ->
+		utils.newApiSecret()
+		.then (secret) ->
+			device.updateState(apikey: secret)
+			res.status(200).send(secret)
+		.catch (err) ->
+			res.status(503).send(err?.message or err or 'Unknown error')
+
 	return api

src/app.coffee

@@ -25,7 +25,7 @@ knex.init.then ->
 		bootstrap.done
 		.then ->
 			console.log('Starting API server..')
-			api(secret, application).listen(config.listenPort)
+			api(application).listen(config.listenPort)
 			# Let API know what version we are, and our api connection info.
 			console.log('Updating supervisor version and api info')
 			device.updateState(

src/utils.coffee

@@ -101,20 +101,29 @@ exports.connectivityCheck = _.once ->
 				console.log('Waiting for connectivity...')
 				blink.pattern.start(networkPattern)
 
-exports.getOrGenerateApiSecret = do ->
-	apiSecretPromise = null
-	return ->
-		apiSecretPromise ?= Promise.rejected()
-		apiSecretPromise = apiSecretPromise.catch ->
-			knex('config').select('value').where(key: 'apiSecret')
-			.then ([ apiSecret ]) ->
-				return apiSecret.value if apiSecret?
+
+apiSecretPromise = null
+generateApiSecret = ->
 	Promise.try ->
 		return config.forceApiSecret ? randomHexString.generate()
 	.then (newSecret) ->
-					knex('config').insert([{ key: 'apiSecret', value: newSecret }])
+		secretInDB = { key: 'apiSecret', value: newSecret }
+		knex('config').update(secretInDB).where(key: 'apiSecret')
+		.then (affectedRows) ->
+			knex('config').insert(secretInDB) if affectedRows == 0
 		.return(newSecret)
 
+exports.newApiSecret = newApiSecret = ->
+	apiSecretPromise ?= Promise.resolve()
+	apiSecretPromise = apiSecretPromise.then ->
+		generateApiSecret()
+
+exports.getOrGenerateApiSecret = ->
+	apiSecretPromise ?= knex('config').select('value').where(key: 'apiSecret').then ([ apiSecret ]) ->
+		return apiSecret.value if apiSecret?
+		generateApiSecret()
+	return apiSecretPromise
+
 exports.extendEnvVars = (env, uuid) ->
 	host = '127.0.0.1'
 	newEnv =