Google Calendar API with ASP.NET

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I\'m confused about using the Google Calendar API for adding/modifying events in ASP.NET webforms (C#).

I\'m not sure if I need oAuth or what. My app is on my own serve

Summary :

To Call a google clould oauth2 protected resource
From your server to google server
Without user interaction
Accessing your own data
Using C#

Code :

    var private_key = @"-----BEGIN PRIVATE KEY-ccc-END PRIVATE KEY-----\n";
    string calendarId = @"xxxxxxxxxxxxx@group.calendar.google.com";
    var client_email = @"my-google-calender@xxx.iam.gserviceaccount.com";

    var credential =
        new ServiceAccountCredential(
        new ServiceAccountCredential.Initializer(client_email)
        {
            Scopes = new string[] { CalendarService.Scope.Calendar }
        }.FromPrivateKey(private_key));
    var service = new CalendarService(new BaseClientService.Initializer()
    {
        HttpClientInitializer = credential,
    });

Use service methods to get the data
Private Key and client_email can be generated from this link
Calendar Id can be found on calendar.google.com
You must share your calendar with client_email see the demo

  Google            You                             You
  Pay +             Pay +                           Pay +
  Google            Google                          You
  Manage            Manage                          Manage%
 +----------+    +----------+                     +----------+
 | Gmail    |    |          |                     |          |
 | Calendar |    |  G Suite |                     | Google   |
 | drive    |    |          |                     | Cloud    |
 |          |    |          |                     |          |
 +----^-----+    +----+-----+                     +------+---+
      |               ^                                  ^
      |               |                                  |
      |               |                                  |
      |               |                                  |
+-------------------------------------------------------------+
|     |               |                                  |    |
|     |               |                                  |    |
|     |               |       Google                     |    |
|     |               |       Oauth2                     |    |
|     |               |       Server                     |    |
|     |               |                                  |    |
|     |               |                                  |    |
+-------------------------------------------------------------+
      |               |                                  |
      |               |         +----------------+       |
      |               |         |                |       |
      |               |         |                |       | No
      |               |require  |                |       | Consent
      |               |admin    |                |       |
      |               |consent  |                |       |
      |require        |         |                +-------+
      |user           |         |                |
      |consent        +---------+   Your app     |
      |                         |                |
      |                         |                |
      |                         |                |
      |                         |                |
      +-------------------------+                |
                                |                |
                                |                |
                                |                |
                                +----------------+
                                     You
                                     Pay +
                                     You
                                     Manage

Step by Step demo

Step 01 : open google console

https://console.developers.google.com/projectselector/apis/library/calendar-json.googleapis.com

Step 02 : click select

Step 03: select or create a new project

Step 04: click enable or manage

Step 05: click Credentials

Step 06: Create service account key

Step 07: Enter a service account name the click create

Step 08: click Create without role then keep the downloaded json private key in safe place

Step 09: copy your client_email from

Step 10: open google calendar

calendar.google.com

Step 11: open your calendar Settings and sharing

Step 12: got to Share with specific people and click add

Step 13:

Add the email for the service account that you copied before in step 09
change the Permissions too Make changes and manage sharing
click send

Step 14: on the same page copy and save the Calendar ID we will need it

Step 15: crate new console application

Step 16: add the private key json file to your project

Step 17: r-click private key json and click Propertis

Step 18: change "Copy to output Direcory to "Copy always"

Step 19: open PM Console and chose your project on Default project D

Step 20: Install Google.Apis Calendar Package

Install-Package Google.Apis.Calendar.v3

Step 21: replace Program.cs with code

using Google.Apis.Auth.OAuth2;
using Google.Apis.Calendar.v3;
using Google.Apis.Calendar.v3.Data;
using Google.Apis.Services;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace CalendarQuickstart
{
    class Program
    {
        static void Main(string[] args)
        {
            string jsonFile = "xxxxxxx-xxxxxxxxxxxxx.json";
            string calendarId = @"xxxxxxxxxxxxx@group.calendar.google.com";

            string[] Scopes = { CalendarService.Scope.Calendar };

            ServiceAccountCredential credential;

            using (var stream =
                new FileStream(jsonFile, FileMode.Open, FileAccess.Read))
            {
                var confg = Google.Apis.Json.NewtonsoftJsonSerializer.Instance.Deserialize<JsonCredentialParameters>(stream);
                credential = new ServiceAccountCredential(
                   new ServiceAccountCredential.Initializer(confg.ClientEmail)
                   {
                       Scopes = Scopes
                   }.FromPrivateKey(confg.PrivateKey));
            }

            var service = new CalendarService(new BaseClientService.Initializer()
            {
                HttpClientInitializer = credential,
                ApplicationName = "Calendar API Sample",
            });

            var calendar = service.Calendars.Get(calendarId).Execute();
            Console.WriteLine("Calendar Name :");
            Console.WriteLine(calendar.Summary);

            Console.WriteLine("click for more .. ");
            Console.Read();


            // Define parameters of request.
            EventsResource.ListRequest listRequest = service.Events.List(calendarId);
            listRequest.TimeMin = DateTime.Now;
            listRequest.ShowDeleted = false;
            listRequest.SingleEvents = true;
            listRequest.MaxResults = 10;
            listRequest.OrderBy = EventsResource.ListRequest.OrderByEnum.StartTime;

            // List events.
            Events events = listRequest.Execute();
            Console.WriteLine("Upcoming events:");
            if (events.Items != null && events.Items.Count > 0)
            {
                foreach (var eventItem in events.Items)
                {
                    string when = eventItem.Start.DateTime.ToString();
                    if (String.IsNullOrEmpty(when))
                    {
                        when = eventItem.Start.Date;
                    }
                    Console.WriteLine("{0} ({1})", eventItem.Summary, when);
                }
            }
            else
            {
                Console.WriteLine("No upcoming events found.");
            }
            Console.WriteLine("click for more .. ");
            Console.Read();

            var myevent = DB.Find(x => x.Id == "eventid" + 1);

            var InsertRequest = service.Events.Insert(myevent, calendarId);

            try
            {
                InsertRequest.Execute();
            }
            catch (Exception)
            {
                try
                {
                    service.Events.Update(myevent, calendarId, myevent.Id).Execute();
                    Console.WriteLine("Insert/Update new Event ");
                    Console.Read();

                }
                catch (Exception)
                {
                    Console.WriteLine("can't Insert/Update new Event ");

                }
            }
        }


        static List<Event> DB =
             new List<Event>() {
                new Event(){
                    Id = "eventid" + 1,
                    Summary = "Google I/O 2015",
                    Location = "800 Howard St., San Francisco, CA 94103",
                    Description = "A chance to hear more about Google's developer products.",
                    Start = new EventDateTime()
                    {
                        DateTime = new DateTime(2019, 01, 13, 15, 30, 0),
                        TimeZone = "America/Los_Angeles",
                    },
                    End = new EventDateTime()
                    {
                        DateTime = new DateTime(2019, 01, 14, 15, 30, 0),
                        TimeZone = "America/Los_Angeles",
                    },
                     Recurrence = new List<string> { "RRULE:FREQ=DAILY;COUNT=2" },
                    Attendees = new List<EventAttendee>
                    {
                        new EventAttendee() { Email = "lpage@example.com"},
                        new EventAttendee() { Email = "sbrin@example.com"}
                    }
                }
             };
    }
}

Step 22: replace json File Name with your json file name

  string jsonFile = "xxxxxxx-xxxxxxxx.json";

Step 23: replace calendarId with your calendarId from step 14

 string calendarId = @"xxxxxxxxxxxxx@group.calendar.google.com";

Step 24: run the app

Step 25 : visit you calendar you should see the event in

 2019/01/13

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