pnp-management-shell-graph-call.cs

//Slightly adjusted from https://github.com/pnp/pnpcore/blob/dev/samples/Demo.Console.Minimal/Program.cs
//The goal is to send an email using Graph API and by authenticating through PnP Management Shell
//Without a custom app registration
//corresponding commands: https://pnp.github.io/cli-microsoft365/cmd/outlook/mail/mail-send/
//and 
using AngleSharp.Dom;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using PnP.Core.Auth;
using PnP.Core.Services;
using System.Net.Http.Headers;
using System.Net.Http.Json;
using System.Net.Mail;
using System.Security;
using System.Text.Json.Nodes;
using System.Text.Json.Serialization;

string siteUrl = "https://contoso.sharepoint.com";
var account = "system.account@contoso.onmicrosoft.com";
SecureString sec = new SecureString();
string pwd = ""; 
pwd.ToCharArray().ToList().ForEach(sec.AppendChar);
sec.MakeReadOnly();

var host = Host.CreateDefaultBuilder()
    .ConfigureServices((context, services) => 
    {
        services.AddPnPCore(options =>
        {
            options.DefaultAuthenticationProvider = new UsernamePasswordAuthenticationProvider(null, null, account, sec);
        });
    })
    .UseConsoleLifetime()
    .Build();

await host.StartAsync();

using (var scope = host.Services.CreateScope())
{
    var pnpContextFactory = scope.ServiceProvider.GetRequiredService<IPnPContextFactory>();
    using (var context = await pnpContextFactory.CreateAsync(new Uri(siteUrl)))
    {
        var token = await context.AuthenticationProvider.GetAccessTokenAsync(new Uri("https://graph.microsoft.com/"));
        string mp = "{\"message\": {\"subject\": \"Meet for lunch?\",\"body\": {\"contentType\": \"Text\",\"content\": \"The new cafeteria is open.\"},\"toRecipients\": [{\"emailAddress\": {\"address\": \"kontroll.zeta@contoso.se\"}}]}}";
        var smp = new StringContent(mp, System.Text.Encoding.UTF8, "application/json");   
        var uri = "https://graph.microsoft.com/v1.0/me/sendMail";
        var client = new HttpClient();
        client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", token);
        var response = await client.PostAsync(uri, smp);
        response.EnsureSuccessStatusCode();
    }
}