I have created asp.net core web api application to connect to Microsoft Outlook calendar and add new event using graph api. I have created Microsoft office 365 E3 business account(trial). I have registered my application in active directory on Azure portal using same account. Set
my authentication class is
using System.Net.Http;
using System.Net.Http.Headers;
using System.Security;
using System.Threading.Tasks;
using Microsoft.Identity.Client;
using Microsoft.Graph;
namespace Helpers
{
public class MsalAuthenticationProvider : IAuthenticationProvider
{
private static MsalAuthenticationProvider _singleton;
private IPublicClientApplication _clientApplication;
private string[] _scopes;
private string _username;
private SecureString _password;
private string _userId;
private MsalAuthenticationProvider(IPublicClientApplication clientApplication, string[] scopes, string username, SecureString password)
{
_clientApplication = clientApplication;
_scopes = scopes;
_username = username;
_password = password;
_userId = null;
}
public static MsalAuthenticationProvider GetInstance(IPublicClientApplication clientApplication, string[] scopes, string username, SecureString password)
{
if (_singleton == null)
{
_singleton = new MsalAuthenticationProvider(clientApplication, scopes, username, password);
}
return _singleton;
}
public async Task AuthenticateRequestAsync(HttpRequestMessage request)
{
var accessToken = await GetTokenAsync();
request.Headers.Authorization = new AuthenticationHeaderValue("bearer", accessToken);
}
public async Task<string> GetTokenAsync()
{
if (!string.IsNullOrEmpty(_userId))
{
try
{
var account = await _clientApplication.GetAccountAsync(_userId);
if (account != null)
{
var silentResult = await _clientApplication.AcquireTokenSilent(_scopes, account).ExecuteAsync();
return silentResult.AccessToken;
}
}
catch (MsalUiRequiredException) { }
}
var result = await _clientApplication.AcquireTokenByUsernamePassword(_scopes, _username, _password).ExecuteAsync();
_userId = result.Account.HomeAccountId.Identifier;
return result.AccessToken;
}
}
}
and my controller is
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Runtime.Versioning;
using System.Security;
using System.Threading.Tasks;
using Helpers;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Configuration;
using Microsoft.Graph;
using Microsoft.Identity.Client;
using WebAPI_OneDrive.Models;
namespace WebAPI_OneDrive.Controllers
{
//[Route("api/[controller]")]
[ApiController]
public class OutlookController : ControllerBase
{
[HttpPost]
[Route("Outlook/CreateEvent")]
public async Task<string> CreateEventAsync(/*CredentialsModel model*/)
{
CredentialsModel model = new CredentialsModel();
model.applicationId = "9403804b-f9b6-4bb0-b8dd-2f40b4347ef1";
model.tenantId = "926349b9-42cb-46c0-bb34-970256de5c41";
model.userName = "[email protected]";
model.password = "p@ssw0rd";
var userName = model.userName;
var stringPassword = model.password;
var applicationId = model.applicationId;
var tenantId = model.tenantId;
var userPassword = new SecureString();
foreach (char c in stringPassword)
{
userPassword.AppendChar(c);
}
var config = LoadAppSettings(applicationId, tenantId);
var graphClient = GetAuthenticatedGraphClient(config, userName, userPassword);
//Create Event
var @event = new Event
{
Subject = "Let's go for lunch",
Body = new ItemBody
{
ContentType = BodyType.Html,
Content = "Does noon work for you?"
},
Start = new DateTimeTimeZone
{
DateTime = "2022-07-19T12:00:00",
TimeZone = "Pacific Standard Time"
},
End = new DateTimeTimeZone
{
DateTime = "2022-07-19T14:00:00",
TimeZone = "Pacific Standard Time"
},
Location = new Location
{
DisplayName = "Harry's Bar"
},
Attendees = new List<Attendee>()
{
new Attendee
{
EmailAddress = new EmailAddress
{
Address = "[email protected]",
Name = "Samantha Booth"
},
Type = AttendeeType.Required
}
},
AllowNewTimeProposals = true,
TransactionId = "7E163156-7762-4BEB-A1C6-729EA81755A7"
};
var Event = await graphClient.Me.Calendar.Events
.Request()
.AddAsync(@event);
var EventId = Event.Id;
return EventId;
}
private static IConfigurationRoot LoadAppSettings(string applicationId, string tenantId)
{
try
{
var config = new ConfigurationBuilder()
.SetBasePath(System.IO.Directory.GetCurrentDirectory())
.AddJsonFile("appsettings.json", false, true)
.Build();
config["applicationId"] = applicationId;
config["tenantId"] = tenantId;
if (string.IsNullOrEmpty(config["applicationId"]) ||
string.IsNullOrEmpty(config["tenantId"]))
{
return null;
}
return config;
}
catch (System.IO.FileNotFoundException)
{
return null;
}
}
private static IAuthenticationProvider CreateAuthorizationProvider(IConfigurationRoot config, string userName, SecureString userPassword)
{
var clientId = config["applicationId"];
var authority = $"https://login.microsoftonline.com/{config["tenantId"]}/v2.0";
List<string> scopes = new List<string>();
scopes.Add("User.Read");
scopes.Add("Calendars.Read");
scopes.Add("Calendars.Read.Shared");
scopes.Add("Calendars.ReadWrite");
scopes.Add("Calendars.Read.Shared");
//scopes.Add("Files.Read");
//scopes.Add("Files.ReadWrite");
//scopes.Add("Files.Read.All");
//scopes.Add("Files.ReadWrite.All");
//scopes.Add("Files.Read.Selected");
//scopes.Add("Files.ReadWrite.Selected");
//scopes.Add("Files.ReadWrite.AppFolder");
var cca = PublicClientApplicationBuilder.Create(clientId)
.WithAuthority(authority)
.Build();
return MsalAuthenticationProvider.GetInstance(cca, scopes.ToArray(), userName, userPassword);
}
private static GraphServiceClient GetAuthenticatedGraphClient(IConfigurationRoot config, string userName, SecureString userPassword)
{
var authenticationProvider = CreateAuthorizationProvider(config, userName, userPassword);
var graphClient = new GraphServiceClient(authenticationProvider);
return graphClient;
}
//Model
public class CredentialsModel
{
///credentials
public string password { get; set; }
public string userName { get; set; }
public string applicationId { get; set; }
public string tenantId { get; set; }
}
}
}
when I call Outlook/CreateEvent I am getting the following error
Please guide me how to fix this error, thanks in advance
CodePudding user response：
To resolve this issue, try to grant Application permission as below and and grant admin consent:
After adding application permission try to get a bearer token as below
Please check this reference List events - Microsoft Graph v1.0 | Microsoft Docs as per document Finally, I am getting list of calendar events successfully:
