I'm trying to create a C# tool to manipulate my Google Calendar. The tool is receives events from API successfully, but when trying to create an event I get the error:
Google.GoogleApiException: 'Google.Apis.Requests.RequestError
Insufficient Permission: Request had insufficient authentication scopes. [403]
Errors [
Message[Insufficient Permission: Request had insufficient authentication scopes.] Location[ - ] Reason[insufficientPermissions] Domain[global]
]
I have 2 buttons: one for creating event and one button for showing the upcoming events. Please observe that I tried 3 different methods to add an event, all with the same error result.
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using Google.Apis.Auth.OAuth2;
using Google.Apis.Calendar.v3;
using Google.Apis.Calendar.v3.Data;
using Google.Apis.Services;
using Google.Apis.Util.Store;
namespace GoogleCalendarsAssistant
{
public partial class form_GoogleCalendarsAssistant : Form
{
public static class g
{
public static string[] Scopes = { CalendarService.Scope.Calendar };
public static string ApplicationName = "GoogleCalendarsAssistant";
public static UserCredential credential;
}
public string newline = "\r\n";
public string tab = " ";
public form_GoogleCalendarsAssistant()
{
InitializeComponent();
}
private void btn_addEvent_Click(object sender, EventArgs e)
{
using (var stream = new FileStream("credentials.json", FileMode.Open, FileAccess.Read))
{
// The file token.json stores the user's access and refresh tokens, and is created automatically when the authorization flow completes
string credPath = "token.json";
g.credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(stream).Secrets,
g.Scopes,
"user",
CancellationToken.None,
new FileDataStore(credPath, true)).Result;
Console.WriteLine("Credential file saved to: " + credPath);
//tb_general.Text += newline + "Credential file saved to: " + credPath;
}
// Create Google Calendar API service.
var service = new CalendarService(new BaseClientService.Initializer()
{
HttpClientInitializer = g.credential,
ApplicationName = g.ApplicationName,
});
// Define parameters of request.
Event addEvent_body = new Event();
addEvent_body.Summary = "test summary";
addEvent_body.Location = "test location";
addEvent_body.Description = "test description";
addEvent_body.Start = new EventDateTime()
{
DateTime = new DateTime(2019, 3, 7, 14, 0, 0),
TimeZone = "Romania/Bucharest"
};
addEvent_body.End = new EventDateTime()
{
DateTime = new DateTime(2019, 3, 7, 15, 0, 0),
TimeZone = "Romania/Bucharest"
};
addEvent_body.Attendees = new List<EventAttendee>()
{
new EventAttendee() {Email = "john@myjob.com"}
};
// Add event
//method 1
Event addEvent = service.Events.Insert(addEvent_body, "primary").Execute();
//method 2
//EventsResource.InsertRequest addEventResource = service.Events.Insert(addevent_body, "primary");
//addEventResource.Execute();
//method 3
//EventsResource.InsertRequest request = service.Events.Insert(addevent_body, "primary");
//request.Execute();
}
private void btn_upcoming_Click(object sender, EventArgs e)
{
using (var stream = new FileStream("credentials.json", FileMode.Open, FileAccess.Read))
{
// The file token.json stores the user's access and refresh tokens, and is created automatically when the authorization flow completes
string credPath = "token.json";
g.credential = GoogleWebAuthorizationBroker.AuthorizeAsync(
GoogleClientSecrets.Load(stream).Secrets,
g.Scopes,
"user",
CancellationToken.None,
new FileDataStore(credPath, true)).Result;
Console.WriteLine("Credential file saved to: " + credPath);
//tb_general.Text += newline + "Credential file saved to: " + credPath;
}
// Create Google Calendar API service.
var service = new CalendarService(new BaseClientService.Initializer()
{
HttpClientInitializer = g.credential,
ApplicationName = g.ApplicationName,
});
// Define parameters of request.
EventsResource.ListRequest request = service.Events.List("primary");
request.TimeMin = DateTime.Now;
request.ShowDeleted = false;
request.SingleEvents = true;
request.MaxResults = 30;
request.OrderBy = EventsResource.ListRequest.OrderByEnum.StartTime;
// List events.
Events events = request.Execute();
//Console.WriteLine("Upcoming events:");
tb_general.Text = "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);
tb_general.Text += newline + tab + eventItem.Summary + when;
}
}
else
{
//Console.WriteLine("No upcoming events found.");
tb_general.Text = newline + "No upcoming events found.";
}
//Console.Read();
}
}
}
So... I found the problem: when the app starts for the first time, Google API creates a token.json file based on the desired Scopes. In my case, I first used "CalendarReadOnly" and then I edited this in "Calendar" in order to be able to create and delet events. So I just deleted the token.json and launched the app again and a new token.json was received with the "Calendar" scope. Also, I gave up setting the timezone because of the error 400, but it's optional anyway.
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