optionally send invites to our slack channel on signup (#385)

lib/routes/api/register.js

@@ -3,7 +3,7 @@ const debug = require('debug')('jambonz:api-server');
 const {DbErrorBadRequest, DbErrorUnprocessableRequest} = require('../../utils/errors');
 const {promisePool} = require('../../db');
 const {doGithubAuth, doGoogleAuth, doLocalAuth} = require('../../utils/oauth-utils');
-const {validateEmail} = require('../../utils/email-utils');
+const {validateEmail, emailSimpleText} = require('../../utils/email-utils');
 const {cacheClient} = require('../../helpers');
 const { v4: uuid } = require('uuid');
 const short = require('short-uuid');
@@ -12,6 +12,7 @@ const jwt = require('jsonwebtoken');
 const {setupFreeTrial, createTestCdrs, createTestAlerts} = require('./utils');
 const {generateHashedPassword} = require('../../utils/password-utils');
 const sysError = require('../error');
+
 const insertUserSql = `INSERT into users 
 (user_sid, account_sid, name, email, provider, provider_userid, email_validated) 
 values (?, ?, ?, ?, ?, ?, 1)`;
@@ -36,6 +37,17 @@ const insertSignupHistorySql = `INSERT into signup_history
 (email, name) 
 values (?, ?)`;
 
+const slackEmail = `Hi there and welcome to jambonz!
+
+We are excited to have you on board. Feel free to join the community on Slack at https://joinslack.jambonz.org, 
+where you can connect with other jambonz users, ask questions, share your experiences, and learn from others.
+
+Hope to see you there!
+
+Best, 
+
+DaveH and the jambonz team`;
+
 const addLocalUser = async(logger, user_sid, account_sid,
   name, email, email_activation_code, passwordHash, service_provider_sid) => {
   const [r] = await promisePool.execute(insertUserLocalSql,
@@ -324,6 +336,15 @@ router.post('/', async(req, res) => {
         tutorial_completion: 0,
         scope: 'read-write'
       });
+
+      // send invite to Slack
+      if (process.env.SEND_SLACK_INVITE_ON_SIGNUP) {
+        try {
+          emailSimpleText(logger, userProfile.email, 'Welcome to jambonz!', slackEmail);
+        } catch (err) {
+          logger.info({err}, 'Error sending slack invite');
+        }
+      }
     }
     else if (user_sid) {
       /* add a new user for existing account */