Script to look up Slack user details by real name

slack-find-users-by-name

#!/usr/bin/env ruby

# A script to find Slack user details by name

require 'uri'
require 'net/http'
require 'json'

class Auditor

  def initialize(slack_token)
    @slack_token = slack_token

    @slack_api = Net::HTTP.new('api.slack.com', '443')
    @slack_api.use_ssl = true
  end

  def audit(usernames)
    members = []

    for_each_member { |member| members << member }

    usernames.each do |name|
      name = name.strip

      member = members.select { |member| member[:real_name] == name }.first
      unless member.nil?
        puts "#{name},#{member[:username]},#{member[:email]}"
      else
        puts "#{name},,"
      end
    end
  end

  private 

  def for_each_member(&block)
    base_userlist_uri = "https://api.slack.com/api/users.list"
    userlist_uri = URI("#{base_userlist_uri}?limit=200")

    while !userlist_uri.nil?
      response = @slack_api.get(userlist_uri.request_uri,
        { 'authorization' => "Bearer #{@slack_token}" }
      )

      case response.code
      when '200'
        result = JSON.parse(response.body)
        result['members'].each do |member|
          block.call({
            username: member['name'],
            real_name: member.dig('profile', 'real_name'),
            email: member.dig('profile', 'email')
          })
        end

        next_cursor = result.dig('response_metadata', 'next_cursor')
        if next_cursor.nil? || next_cursor.strip.empty?
          userlist_uri = nil
        else
          userlist_uri = URI("#{base_userlist_uri}?cursor=#{next_cursor}&limit=200")
        end
      else
        $stderr.puts("Failed to query user list: #{response}")
      end
    end
  end

end

def main
  if ARGV.length < 1
    $stderr.puts("Usage: #{$0} <slack-token> [file-of-names'")
    exit(1)
  end

  slack_token = ARGV[0]
  ARGV.shift

  Auditor.new(slack_token).audit(ARGF)
end

main if __FILE__ == $0