module Calendar
require 'google/api_client'
extend ActiveSupport::Concern
API_VERSION = 'v3'
CACHED_API_FILE = "calendar-#{API_VERSION}.cache"
CALENDAR_ID = Rails.application.secrets.calendarId
def gcal_event_insert
params = {
calendarId: CALENDAR_ID
}
result = client.execute(
:api_method => calendar.events.insert,
:parameters => params,
:body_object => convert_to_gcal_event
)
logger.debug(result.data.to_yaml)
result
end
def gcal_event_update
params = {
calendarId: CALENDAR_ID,
eventId: self.gcal_id
}
result = client.execute(
:api_method => calendar.events.update,
:parameters => params,
:body_object => convert_to_gcal_event
)
logger.debug(result.data.to_yaml)
end
def gcal_event_delete
params = {
calendarId: CALENDAR_ID,
eventId: self.gcal_id
}
result = client.execute(
:api_method => calendar.events.delete,
:parameters => params
)
logger.debug(result.data.to_yaml)
end
private
def convert_to_gcal_event
event = {
'summary' => self.name,
'description' => self.description,
'start' => {
'dateTime' => self.tstart
},
'end' => {
'dateTime' => self.tend
},
'location' => get_event_location,
'extendedProperties' => {
'private' => {
'id' => self.id
}
}
}
end
def get_event_location
[self.location.try(:name),
self.location.try(:address),
self.location.try(:city),
self.location.try(:country)].compact.join(", ")
end
def init_client
@client = Google::APIClient.new(:application_name => 'EventR', :application_version => '1.0.0')
# Load our credentials for the service account
key = Google::APIClient::KeyUtils.load_from_pkcs12(Rails.application.secrets.key_file, Rails.application.secrets.key_secret)
@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',
:issuer => Rails.application.secrets.service_account_email,
:person => Rails.application.secrets.impersonate_user_email,
:signing_key => key)
# Request a token for our service account
@client.authorization.fetch_access_token!
@client
end
def init_calendar
@calendar = nil
# Load cached discovered API, if it exists. This prevents retrieving the
# discovery document on every run, saving a round-trip to the discovery service.
if File.exists? CACHED_API_FILE
File.open(CACHED_API_FILE) do |file|
@calendar = Marshal.load(file)
end
else
@calendar = @client.discovered_api('calendar', API_VERSION)
File.open(CACHED_API_FILE, 'w') do |file|
Marshal.dump(@calendar, file)
end
end
end
def client
@client ||= init_client
end
def calendar
@calendar ||= init_calendar
end
end | 
