Load Google Calendar events and convert them into BusyBird statuses

gcal2busybird.rb

#!/usr/bin/env ruby
# coding: utf-8

## See also: http://qiita.com/mechamogera/items/bf2ed20e332dc31d2352

require 'google/api_client'
require 'json'
require 'date'
require 'optparse'

FORMAT = '%a %b %d %H:%M:%S %z %Y'
$utc_offset = '+09:00'
$count = 100

def get_time(item)
  time = item['start']['dateTime']
  if !time
    date = item['start']['date']
    if !date
      return nil
    end
    date =~ /^(\d{4})-(\d{2})-(\d{2})/
    time = Time.new($~[1].to_i, $~[2].to_i, $~[3].to_i, 0, 0, 0, $utc_offset)
  end
  return time
end

OptionParser.new do |opt|
  opt.version = "0.02"
  opt.on("--service-key-file FILE", "Path to the service key file") {|v|
    $service_key_file = v
  }
  opt.on("--service-password PASSWORD", "Password for the service key file") {|v|
    $service_password = v
  }
  opt.on("--service-email EMAIL", "Email address for the service account") {|v|
    $service_email = v
  }
  opt.on("--calendar-id ID", "Calendar ID to fetch") {|v|
    $calendar_id = v
  }
  opt.on("--utc-offset [OFFSET]",
         "Timezone offset from UTC. This is used when timezone is not specified in events. (default: '+09:00')") {|v|
    $utc_offset = v
  }
  opt.on("--count [COUNT]", "Number of events to load (default: 100)") {|v|
    $count = v
  }
  opt.parse! ARGV
end

client = Google::APIClient.new(:application_name => '')

# Authorization
key = Google::APIClient::KeyUtils.load_from_pkcs12($service_key_file, $service_password)
client.authorization = Signet::OAuth2::Client.new(
  :token_credential_uri => 'https://accounts.google.com/o/oauth2/token',
  :audience => 'https://accounts.google.com/o/oauth2/token',
  :scope => 'https://www.googleapis.com/auth/calendar.readonly',
  :issuer => $service_email,
  :signing_key => key)
client.authorization.fetch_access_token!

# Fetching Calendar events
cal = client.discovered_api('calendar', 'v3')

params = {
  'calendarId' => $calendar_id,
  'orderBy' => 'startTime',
  'timeMin' => Time.now.getgm.iso8601,
  'singleEvents' => 'True',
  'maxResults' => $count,
}

result = client.execute(:api_method => cal.events.list,
                        :parameters => params)

bb_result = result.data.items.collect do |item|
  time = get_time item
  icon_str = time ? sprintf('http://calendar.google.com/googlecalendar/images/favicon_v2014_%d.ico',
                            time.day) : nil
  {
    "id" => sprintf('%d|%s', (item.updated ? item.updated.to_i :
                              item.created ? item.created.to_i : 0),
                             item["htmlLink"]),
    "created_at" => time ? time.strftime(FORMAT) : nil,
    "user" => {
      "screen_name" => result.data.summary,
      "profile_image_url" => icon_str,
    },
    "busybird" => { "status_permalink" => item["htmlLink"] },
    "text" => item["summary"],
  }
end

print JSON.generate bb_result