groupme.rb

require 'net/http'
require 'json'
require 'csv'

# Put access token
AccessToken = ""
RequestDelay = 1 # in seconds

def messages(group_id, group_name)
  limit = 100
  before_id = ""
  CSV.open(group_id + " " + group_name + ".csv", "w") do |csv|
    loop do
      uri = "https://api.groupme.com/v3/groups/#{group_id}/messages?limit=#{limit}&before_id=#{before_id}&access_token=#{AccessToken}"
      puts uri
      result = Net::HTTP.get(URI.parse(uri))

      break unless result
      messages_json = JSON.parse(result)

      message_id = ""
      messages_json["response"]["messages"].each_with_index do |m, k|
        message_id = m["id"]
        csv << [message_id, m["user_id"], m["name"], m["created_at"], m["text"]]
      end

      before_id = message_id
      puts before_id
      sleep RequestDelay
    end
  end
end

def groups
  page = 1
  per_page = 100
  loop do
    uri = "https://api.groupme.com/v3/groups?per_page=#{per_page}&page=#{page}&access_token=#{AccessToken}"
    puts uri
    result = Net::HTTP.get(URI.parse(uri))
    groups_json = JSON.parse(result)
    break if groups_json["response"].length == 0

    csv_str = CSV.generate do |csv|
      groups_json["response"].each_with_index do |group, j|
        # index = ((page-1)*per_page)+j
        csv << [group["group_id"],group["name"]]
      end
    end
    page += 1
    puts csv_str
    sleep RequestDelay
  end
end

# To show groups
#groups

# Write out messages
messages("2461547", "Ribday")