Google Calendar

A fast lightweight and minimalist wrapper around the Google Calendar API.

Install

  [sudo] gem install 'google_calendar'

Setup

Important Changes: Google no longer supports the 'urn:ietf:wg:oauth:2.0:oob' out-of-band OAuth method. You must setup your OAuth Credentials with a publically accessible URL where you can grab your code from the URL paramaters after approving the OAuth request. If your product is a Web Application, you can automate this set up by pointing the redirect_url to the appropriate method of your application.

Obtain a Client ID and Secret

Go to the Google Developers Console.
Select a project, or create a new one (at the top of the page).
In the sidebar on the left, select Library.
Type in 'Google Calendar' in the search box and click on 'Google Calendar API' in the results.
Click on the 'Enable' link at the top of the page.
In the sidebar on the left, select Credentials.
If you haven't done so already, create your 'OAuth client ID' by clicking 'Create Credentials -> OAuth client ID'. Choose Web Application as the type.
You must also provide an "Authorized redirect URIs" which is a publically reachable URL where google will redirect to after the OAuth approval. Google will append the paramater 'code=<your auth code>' to this URL during redirection which will include the necessary code to authenticate the usage of this application.
Take note of the Client ID and Client Secret as you'll need to add it to your code later.
In the sidebar on the left, select "OAuth consent screen". You must setup your Application Name, and add "Test users" if this is for personal use (i.e. you are setting up links to a limited set of known users' calendars), or "Publish" your app if this is for public use.

Find your calendar ID

Visit Google Calendar in your web browser.
In the calendar list on the left, click the three vertical dots next to the appropriate calendar, then select 'Settings and sharing'.
From the left toolbar, choose 'Integrate Calendar'.
In the Integrate Calendar section, locate the Calendar ID at the top of the section.
Copy the Calendar ID.

Usage (readme_code.rb)

  require 'rubygems'
  require 'google_calendar'

  # Create an instance of the calendar.
  cal = Google::Calendar.new(:client_id     => YOUR_CLIENT_ID,
                             :client_secret => YOUR_SECRET,
                             :calendar      => YOUR_CALENDAR_ID,
                             :redirect_url  => YOUR_REDIRECT_URL # This must match a url you permitted in your OAuth setting
                             )

  puts "Do you already have a refresh token? (y/n)"
  has_token = $stdin.gets.chomp

  if has_token.downcase != 'y'

    # A user needs to approve access in order to work with their calendars.
    puts "Visit the following web page in your browser and approve access."
    puts cal.authorize_url
    puts "\nCopy the code out of the paramters after Google redirects you to your provided redirect_url"

    # Pass the ONE TIME USE access code here to login and get a refresh token that you can use for access from now on.
    refresh_token = cal.login_with_auth_code( $stdin.gets.chomp )

    puts "\nMake sure you SAVE YOUR REFRESH TOKEN so you don't have to prompt the user to approve access again."
    puts "your refresh token is:\n\t#{refresh_token}\n"
    puts "Press return to continue"
    $stdin.gets.chomp

  else

    puts "Enter your refresh token"
    refresh_token = $stdin.gets.chomp
    cal.login_with_refresh_token(refresh_token)

    # Note: You can also pass your refresh_token to the constructor and it will login at that time.

  end

  event = cal.create_event do |e|
    e.title = 'A Cool Event'
    e.start_time = Time.now
    e.end_time = Time.now + (60 * 60) # seconds * min
  end

  puts event

  event = cal.find_or_create_event_by_id(event.id) do |e|
    e.title = 'An Updated Cool Event'
    e.end_time = Time.now + (60 * 60 * 2) # seconds * min * hours
  end

  puts event

  # All events
  puts cal.events

  # Query events
  puts cal.find_events('your search string')

This sample code is located in readme_code.rb in the root folder.

Ruby Support

The current google_calendar gem supports Ruby 3.2 and higher — the signet OAuth2 dependency requires it. Older Ruby versions (1.8.7 through 2.7) are maintained on different branches.

Notes

This is not a complete implementation of the calendar api, it just includes the features we needed to support our internal calendar integration. Feel free to add additional features and we will happily integrate them.
Did you get an SSL exception? If so take a look at this: https://gist.github.com/fnichol/867550

Contributing to google_calendar

Check out the latest master to make sure the feature hasn't been implemented or the bug hasn't been fixed yet
Check out the issue tracker to make sure someone already hasn't requested it and/or contributed it
Fork the project
Start a feature/bugfix branch
Commit and push until you are happy with your contribution
Make sure to add tests for it. This is important so I don't break it in a future version unintentionally.
Please try not to mess with the Rakefile, version, or history. If you want to have your own version, or is otherwise necessary, that is fine, but please isolate to its own commit so I can cherry-pick around it.

Running Tests

The first time you run rake test Rake will copy over .env.test to .env for use by Dotenv. You can also use .env.default as your own starting point, just remember to copy it over to .env before running tests.

You can modify .env with your own credentials and don't worry about accidentally committing to the repo as .env is in the .gitignore.