Get gmail contacts usign token in ruby on rails

Hello Everyone,

I've find a nice way to fetch the gmail contacts of the person whose token is already present in our database. No gem is required for this, just follow the below steps :

Step 1 : https://console.developers.google.com/ create a new application or select one which is existing, then go to "APIs & auth" on the right tab, there in the sub-options choose "API".

Now, you'll find list of API, enable "Contacts API".

Step 2 : In your devise.rb where it is written the keys, write the scope to access the contacts of user.

=> config.omniauth :google_oauth2, CLIENT ID , CLIENT SECRET,  { scope: 'https://www.googleapis.com/auth/userinfo.emailhttps://www.googleapis.com/auth/userinfo.profile https://www.google.com/m8/feeds/&response_type=code'} 

Step 3 : Write code in the controller or where you want to fetch the contacts list : 

=>

      token = current_user.authorization.token

      uri = URI.parse("https://www.google.com")

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

      http.use_ssl = true

      http.verify_mode = OpenSSL::SSL::VERIFY_NONE

      path = "/m8/feeds/contacts/default/full?max-results=10000"

      headers = {'Authorization' => "AuthSub token=#{token}",

      'GData-Version' => "3.0"}

      resp = http.get(path, headers)

      # extract the name and email address from the response data

      # HERE USING REXML TO PARSE GOOGLE GIVEN XML DATA

      xml = REXML::Document.new(resp.body)

      contacts = []

      xml.elements.each('//entry') do |entry|

        person = {}

        person['name'] = entry.elements['title'].text

        gd_email = entry.elements['gd:email']

        person['email'] = gd_email.attributes['address'] if gd_email

        contacts << {label: person['email'], value: person['email'] }

      end

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That's It !!! You have all contacts now.

Happy Coding. 

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[Note] : For Login process, I'd used gem 'omniauth-google-oauth2'