Simplest way to display upcoming events from a public Google calendar? - ruby-on-rails

Question

I have a public calendar on the site. I need to display upcoming events on the front page.
After spending the whole day on this I am about to give up. Google is disabling older API there is no documentation or anything. I am parsing the RSS feed:
http://www.google.com/calendar/feeds/.../public/basic?futureevents=true
And grabbing feed/entry/update and feed/entry/title from XML. I read somewhere that futureevents will display upcoming events. However I get the list of older events.
Okay, then I tried to use API V3 https://developers.google.com/google-apps/calendar/v3/reference/events/list
Here is the responce I get:
{
"error": {
"errors": [
{
"domain": "usageLimits",
"reason": "dailyLimitExceededUnreg",
"message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup.",
"extendedHelp": "https://code.google.com/apis/console"
}
],
"code": 403,
"message": "Daily Limit for Unauthenticated Use Exceeded. Continued use requires signup."
}
}
I jumped through more hoops and installed their ruby code sample as I need this for Rails site.
It sort of worked but it requires user to confirm access to their own calendar. I don't need that. Plus it seems that authentication only valid for a day.
The said calendar is public. It is being displayed in iframe on the site with xml and ical feed. All I need is to parse upcoming events to show them on front page.
What is the way to do it without authorization and other ridiculous stuff?

Answer 1

//This works for me! js:
var request = gapi.client.calendar.events.list({
'calendarId': 'xxx',
'timeMin': (new Date()).toISOString(),
'showDeleted': false,
'singleEvents': true,
'maxResults': 1,
'orderBy': 'startTime'
});
request.execute(function(resp) {}

Answer 2

Use this wizard to create a new API project: https://console.developers.google.com/start/api?id=calendar Then click on "create new key" (choose server key). Then do a request to https://www.googleapis.com/calendar/v3/calendars//events?key={YOUR_API_KEY} replacing the email and api key with your values.