added slack event listener - #4

package.json

@@ -12,6 +12,8 @@
   "author": "Filiosoft Open Source <[email protected]>",
   "license": "MIT",
   "dependencies": {
+    "@slack/events-api": "^1.0.1",
+    "body-parser": "^1.18.3",
     "botkit": "^0.6.14",
     "cookie-session": "^2.0.0-beta.3",
     "dotenv": "^5.0.1",

server/app.js

@@ -14,6 +14,9 @@ require('./config/mongo')(config)
 // configure passport
 require('./config/passport')(app, config)
 
+// configure slack
+require('./config/slack')(app, config)
+
 // configure routes
 require('./routes')(app, config)
 

server/config/config.js

@@ -6,7 +6,10 @@ const config = {
   gitlabAppId: process.env.GITLAB_APP_ID,
   gitlabAppSecret: process.env.GITLAB_APP_SECRET,
   baseUrl: process.env.BASE_URL || 'http://localhost:3000',
-  dbUri: process.env.MONGODB_URI || 'mongodb://localhost:27017/glib'
+  dbUri: process.env.MONGODB_URI || 'mongodb://localhost:27017/glib',
+  slack: {
+    verificationToken: process.env.SLACK_VERIFICATION_TOKEN
+  }
 }
 
 module.exports = config

server/config/express.js

@@ -1,5 +1,6 @@
 const cookieSession = require('cookie-session')
 const exphbs = require('express-handlebars')
+const bodyParser = require('body-parser')
 
 module.exports = (app, config) => {
   app.engine(
@@ -11,6 +12,8 @@ module.exports = (app, config) => {
   )
   app.set('view engine', '.hbs')
 
+  // You must use a body parser for JSON before mounting the adapter
+  app.use(bodyParser.json())
   // cookieSession config
   app.use(
     cookieSession({

server/config/slack.js

@@ -0,0 +1,21 @@
+const sea = require('@slack/events-api')
+
+module.exports = (app, config) => {
+  const slackEvents = sea.createSlackEventAdapter(
+    config.slack.verificationToken
+  )
+
+  app.use('/slack/events', slackEvents.expressMiddleware())
+
+  // Attach listeners to events by Slack Event "type". See: https://api.slack.com/events/message.im
+  slackEvents.on('message', event => {
+    console.log(
+      `Received a message event: user ${event.user} in channel ${
+        event.channel
+      } says ${event.text}`
+    )
+  })
+
+  // Handle errors (see `errorCodes` export)
+  slackEvents.on('error', console.error)
+}