From 1a89db8a88701c0407f2296c3ddaae72c920f053 Mon Sep 17 00:00:00 2001
From: David Avellaneda <g.avella@gmail.com>
Date: Sat, 22 Oct 2016 17:04:50 -0500
Subject: [PATCH] Adding support to use environment variable to filter email
 inviting (#243)

---
 bin/slackin  |  2 ++
 lib/index.js | 13 +++++++++++++
 2 files changed, 15 insertions(+)

diff --git a/bin/slackin b/bin/slackin
index e09d5329..f6b896b7 100755
--- a/bin/slackin
+++ b/bin/slackin
@@ -23,6 +23,7 @@ var flags = args.parse(process.argv, {
 
 var org = args.sub[0] || process.env.SLACK_SUBDOMAIN
 var token = args.sub[1] || process.env.SLACK_API_TOKEN
+var emails = process.env.EMAIL_SLACK_LIST || ''
 
 if (flags.help) {
   args.showHelp()
@@ -33,6 +34,7 @@ if (!org || !token) {
 } else {
   flags.org = org
   flags.token = token
+  flags.emails = emails
 }
 
 var port = flags.port
diff --git a/lib/index.js b/lib/index.js
index e4710df3..d970b6b9 100644
--- a/lib/index.js
+++ b/lib/index.js
@@ -27,6 +27,7 @@ export default function slackin ({
   cors: useCors = false,
   path='/',
   channels,
+  emails,
   silent = false // jshint ignore:line,
 }){
   // must haves
@@ -42,6 +43,11 @@ export default function slackin ({
     })
   }
 
+  if (emails) {
+    // convert to an array
+    emails = emails.split(',')
+  }
+
   // setup app
   let app = express()
   let srv = http(app)
@@ -137,6 +143,13 @@ export default function slackin ({
       .json({ msg: 'Invalid email' })
     }
 
+    // Restricting email invites?
+    if (emails && emails.indexOf(email) === -1) {
+      return res
+      .status(400)
+      .json({ msg: 'Your email is not on the accepted email list' })
+    }
+
     if (coc && '1' != req.body.coc) {
       return res
       .status(400)