Almost external dependencies free GA API consuming

analytics_api.rb

require 'date'
require 'json'
require 'net/http'

# non-stdlib dependencies
require 'signet/oauth_2/client'

# First we need to fetch our access token
pkc12_key = File.read('./legato-development-8b36edf27344.p12')

client_authorization = Signet::OAuth2::Client.new(
  token_credential_uri: 'https://accounts.google.com/o/oauth2/token',
  audience: 'https://accounts.google.com/o/oauth2/token',
  issuer: 'lm-reports@legato-development.iam.gserviceaccount.com',
  scope: 'https://www.googleapis.com/auth/analytics.readonly',
  signing_key: OpenSSL::PKCS12.new(pkc12_key, 'notasecret').key
)

access_token = client_authorization.fetch_access_token!['access_token']

# Then we need to grab our profile_id
uri = URI('https://www.googleapis.com/analytics/v3/management/accountSummaries')
uri.query = URI.encode_www_form(access_token: access_token)

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  request = Net::HTTP::Get.new(uri)
  http.request(request)
end

properties = JSON.parse(response.body)['items'][0]['webProperties']
profiles = properties.find { |i| i['id'] == 'UA-42245406-1' }['profiles']

profile_id = profiles.find { |i| i['name'] == 'Todos os dados do website' }['id']

# And finally fetch GA data
uri = URI('https://www.googleapis.com/analytics/v3/data/ga')
uri.query = URI.encode_www_form(
  ids: "ga:#{profile_id}",
  access_token: access_token,
  'start-date' => (Date.today - 30).to_s,
  'end-date' => :yesterday,
  metrics: 'ga:pageviews'
)

response = Net::HTTP.start(uri.hostname, uri.port, use_ssl: true) do |http|
  request = Net::HTTP::Get.new(uri)
  http.request(request)
end

JSON.parse(response.body)

# {
#   "kind":"analytics#gaData",
#   "id":"https://www.googleapis.com/analytics/v3/data/ga?ids=ga:74228006&metrics=ga:pageviews&start-date=2016-01-16&end-date=yesterday",
#   "query":{
#     "start-date":"2016-01-16",
#     "end-date":"yesterday",
#     "ids":"ga:74228006",
#     "metrics":[
#       "ga:pageviews"
#     ],
#     "start-index":1,
#     "max-results":1000
#   },
#   "itemsPerPage":1000,
#   "totalResults":1,
#   "selfLink":"https://www.googleapis.com/analytics/v3/data/ga?ids=ga:74228006&metrics=ga:pageviews&start-date=2016-01-16&end-date=yesterday",
#   "profileInfo":{
#     "profileId":"74228006",
#     "accountId":"42245406",
#     "webPropertyId":"UA-42245406-1",
#     "internalWebPropertyId":"71927960",
#     "profileName":"Todos os dados do website",
#     "tableId":"ga:74228006"
#   },
#   "containsSampledData":false,
#   "columnHeaders":[
#     {
#       "name":"ga:pageviews",
#       "columnType":"METRIC",
#       "dataType":"INTEGER"
#     }
#   ],
#   "totalsForAllResults":{
#     "ga:pageviews":"3404548"
#   },
#   "rows":[
#     [
#       "3404548"
#     ]
#   ]
# }