Rest API - Slack Chat - Whether User Joined Slack Room

[Code4SocialGood]

• Background
  C4SG web application will interface with Slack to provide chat room functionality.

• Requirement
  Create Rest API end point: isJoinedChat
  Description: This operation checks whether a user has joined the Slack team room
  Input Parameter: user's email address
  Constant: Slack team room: https://code4socialgood.slack.com/

• Reference
  Slack API: https://api.slack.com/community
  Slack tasks: Rest API - Slack Chat - Send Join Team Invitation Email #3, Rest API - Slack Chat - Whether User Joined Slack Room #24, Rest API - Slack Chat - Create Private Channel #25, Rest API - Slack Chat - Invite Team Member to Join a Channel  #26

• Document
  Vision - Online Chat.docx
  Use Case Specification - Online Chat.docx
  Chat Technical Design and Slack Integration.docx

[arpitsrm]

@Code4SocialGood : So this is what I had in mind :
Since there is no API to search user by email, we will have to follow the below steps :
a. Get total usersList for our slack team using users.list webApi method
b. Then search if the particular email exists in the userlist

[Code4SocialGood]

1. Search the user table by email, check whether the user is registered in Slack (add a flag column in the user table to indicate whether user joined Slack or not, column definition is not null with default 'N')
2. If flag is Y for the user, then the endpoint returns Y
3. If flag is N for the user, then
   a. Get total usersList for our slack team using users.list webApi method
   b. Update the flag column in user table for the users in userList from Slack
   c. Endpoint returns Y or N for the particular user requested

This logic caches the user list and saves us trip to Slack.