erickoledadevrel/Code.gs

## Code.gs
/**
 * @license
 * Copyright 2019 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

/*
 * This script requires that you enable the Calendar Advanced Service:
 * https://developers.google.com/apps-script/guides/services/advanced#enabling_advanced_services
 */

var CALENDAR_ID = '...';
var LENGTHS = [60, 45, 30];

function doGet() {
  var result = tryBook();
  var template = HtmlService.createTemplateFromFile('Page');
  template.result = result;
  return template.evaluate().setTitle('Walkstation');
}

function tryBook() {
  for (var i = 0; i < LENGTHS.length; i++) {
    var minutes = LENGTHS[i];

    // Determine start and end time.
    var start = new Date();
    start.setMinutes(Math.round(start.getMinutes() / 15.0) * 15);
    var end = new Date(start.getTime());
    end.setMinutes(end.getMinutes() + minutes);

    if (isFree(start, end)) {
      book(start, end);
      return {
        minutes: minutes,
        start: Utilities.formatDate(start, Session.getScriptTimeZone(), 'HH:mm a'),
        end: Utilities.formatDate(end, Session.getScriptTimeZone(), 'HH:mm a')
      };
    }
  }
  return null;
}

function isFree(start, end) {
  var result = Calendar.Freebusy.query({
    timeMin: start.toISOString(),
    timeMax: end.toISOString(),
    timeZone: Session.getScriptTimeZone(),
    items: [{
      id: CALENDAR_ID
    }]
  });
  return result.calendars[CALENDAR_ID].busy.length == 0;
}

function book(start, end) {
  var event = {
    summary: 'Walk',
    start: {
      dateTime: start.toISOString()
    },
    end: {
      dateTime: end.toISOString()
    },
    attendees: [{
      email: CALENDAR_ID,
      resource: true
    }]
  };
  Calendar.Events.insert(event, 'primary');
}

## Page.html
<!--
Copyright 2019 Google LLC

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    https://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
-->
<!DOCTYPE html>
<html>
  <head>
    <base target="_top">
  </head>
  <body>
    <h1>Walkstation Booking</h1>
    <? if (result != null) { ?>
      Success! You've booked the walkstation for <?= result.minutes ?> minutes,
      from <?= result.start ?> to <?= result.end ?>.
    <? } else { ?>
      Unfortunately the walkstation wasn't available.
    <? } ?>
  </body>
</html>
	/**
	* @license
	* Copyright 2019 Google LLC
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at
	*
	* https://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*/

	/*
	* This script requires that you enable the Calendar Advanced Service:
	* https://developers.google.com/apps-script/guides/services/advanced#enabling_advanced_services
	*/

	var CALENDAR_ID = '...';
	var LENGTHS = [60, 45, 30];

	function doGet() {
	var result = tryBook();
	var template = HtmlService.createTemplateFromFile('Page');
	template.result = result;
	return template.evaluate().setTitle('Walkstation');
	}

	function tryBook() {
	for (var i = 0; i < LENGTHS.length; i++) {
	var minutes = LENGTHS[i];

	// Determine start and end time.
	var start = new Date();
	start.setMinutes(Math.round(start.getMinutes() / 15.0) * 15);
	var end = new Date(start.getTime());
	end.setMinutes(end.getMinutes() + minutes);

	if (isFree(start, end)) {
	book(start, end);
	return {
	minutes: minutes,
	start: Utilities.formatDate(start, Session.getScriptTimeZone(), 'HH:mm a'),
	end: Utilities.formatDate(end, Session.getScriptTimeZone(), 'HH:mm a')
	};
	}
	}
	return null;
	}

	function isFree(start, end) {
	var result = Calendar.Freebusy.query({
	timeMin: start.toISOString(),
	timeMax: end.toISOString(),
	timeZone: Session.getScriptTimeZone(),
	items: [{
	id: CALENDAR_ID
	}]
	});
	return result.calendars[CALENDAR_ID].busy.length == 0;
	}

	function book(start, end) {
	var event = {
	summary: 'Walk',
	start: {
	dateTime: start.toISOString()
	},
	end: {
	dateTime: end.toISOString()
	},
	attendees: [{
	email: CALENDAR_ID,
	resource: true
	}]
	};
	Calendar.Events.insert(event, 'primary');
	}
	<!--
	Copyright 2019 Google LLC

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at

	https://www.apache.org/licenses/LICENSE-2.0

	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.
	-->
	<!DOCTYPE html>
	<html>
	<head>
	<base target="_top">
	</head>
	<body>
	<h1>Walkstation Booking</h1>
	<? if (result != null) { ?>
	Success! You've booked the walkstation for <?= result.minutes ?> minutes,
	from <?= result.start ?> to <?= result.end ?>.
	<? } else { ?>
	Unfortunately the walkstation wasn't available.
	<? } ?>
	</body>
	</html>