bulk_users_gitlab.rb

require 'uri'
require 'net/https'
require 'json'


GITLAB_URL = 'https://gitlab-your-url.com'
USERS_API = '/api/v3/users'
PRIVATE_TOKEN='XXXXXXXXX' #Private token from Git-lab profile.
DEFAULT_PASSWORD = 'some_default_password'

def users
  [{name: 'Name', email: 'username@gmail.com'}]
end

def post_request(user)
  uri = URI.parse("#{GITLAB_URL}#{USERS_API}")

  http = Net::HTTP.new(uri.host, uri.port)

  headers = {'private-token' => PRIVATE_TOKEN, 'Content-type' => 'application/json'}
  http.use_ssl = true
  request = Net::HTTP::Post.new(uri.request_uri, headers)
  request.body = user.to_json
  response = http.request(request)
  response.code == '201' ? "Successfully created #{user[:name]} \u{1f60e}" : 'Failed :('
end

def create_users
  users.each do |user|
    json_body = {
        email: user[:email],
        password: DEFAULT_PASSWORD,
        name: user[:name],
        can_create_group: false,
        username: user[:email].split('@').first
    }
    puts post_request(json_body)
  end
end

create_users