song-of-the-day/song_of_the_day/Program.cs

using Scalar.AspNetCore;
using Microsoft.AspNetCore.OpenApi;
using Microsoft.EntityFrameworkCore;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.Cookies;
using System.DirectoryServices.Protocols;

SignalIntegration.Instance = new SignalIntegration(AppConfiguration.Instance.SignalAPIEndpointUri,
                                                    int.Parse(AppConfiguration.Instance.SignalAPIEndpointPort),
                                                    AppConfiguration.Instance.HostPhoneNumber);

var builder = WebApplication.CreateBuilder(args);

Console.WriteLine("Setting up user check timer");
var userCheckTimer = new CronTimer("*/1 * * * *", "Europe/Vienna", includingSeconds: false);
userCheckTimer.OnOccurence += async (s, ea) =>
{
    var memberList = await SignalIntegration.Instance.GetMemberListAsync();
    var dci = DataContext.Instance;
    var needsSaving = false;
    foreach (var memberId in memberList)
    {
        Console.WriteLine("found member: " + memberId);
        var foundUser = dci.Users.Where(u => u.SignalMemberId == memberId).SingleOrDefault();
        if (foundUser == null)
        {
            var newUserContact = await SignalIntegration.Instance.GetContactAsync(memberId);
            Console.WriteLine("New user:");
            Console.WriteLine($"   Name: {newUserContact.Name}");
            Console.WriteLine($"   MemberId: {memberId}");
            User newUser = new User()
            {
                Name = newUserContact.Name,
                SignalMemberId = memberId,
                NickName = string.Empty,
                IsIntroduced = false
            };
            dci.Users.Add(newUser);
            needsSaving = true;
        }
    }

    if (needsSaving)
    {
        await dci.SaveChangesAsync();
    }
    await dci.DisposeAsync();
};
//userCheckTimer.Start();

Console.WriteLine("Setting up user intro timer");
var userIntroTimer = new CronTimer("*/1 * * * *", "Europe/Vienna", includingSeconds: false);
userIntroTimer.OnOccurence += async (s, ea) =>
{
    var dci = DataContext.Instance;
    var introUsers = dci.Users.Where(u => !u.IsIntroduced);
    bool needsSaving = false;
    foreach (var user in introUsers)
    {
        await SignalIntegration.Instance.IntroduceUserAsync(user);
        user.IsIntroduced = true;
        needsSaving = true;
    }

    if (needsSaving)
    {
        await dci.SaveChangesAsync();
    }
    await dci.DisposeAsync();
};
//userIntroTimer.Start();


Console.WriteLine("Setting up pick of the day timer");
var pickOfTheDayTimer = new CronTimer("0 8 * * *", "Europe/Vienna", includingSeconds: false);
pickOfTheDayTimer.OnOccurence += async (s, ea) =>
{
    var dci = DataContext.Instance;
    var luckyUser = await dci.Users.ElementAtAsync((new Random()).Next(await dci.Users.CountAsync()));
    var userName = string.IsNullOrEmpty(luckyUser.NickName) ? luckyUser.Name : luckyUser.NickName;
    SignalIntegration.Instance.SendMessageToGroupAsync($"Today's chosen person to share a song is: **{userName}**");
    SignalIntegration.Instance.SendMessageToUserAsync($"Congratulations, you have been chosen to share a song today!", luckyUser.SignalMemberId);
    var suggestion = await dci.SuggestionHelpers.ElementAtAsync((new Random()).Next(await dci.SuggestionHelpers.CountAsync()));
    SignalIntegration.Instance.SendMessageToUserAsync($"Today's (optional) suggestion helper to help you pick a song is:\n\n**{suggestion.Title}**\n\n*{suggestion.Description}*", luckyUser.SignalMemberId);
    SignalIntegration.Instance.SendMessageToUserAsync($"For now please just share your suggestion with the group - in the future I might ask you to share directly with me or via the website to help me keep track of past suggestions!", luckyUser.SignalMemberId);
};
//pickOfTheDayTimer.Start();

var connection = new LdapConnection(AppConfiguration.Instance.LDAPConfig.LDAPserver)
{
    Credential = new(
        AppConfiguration.Instance.LDAPConfig.Username,
        AppConfiguration.Instance.LDAPConfig.Password
    )
};

var attributesToQuery = new string[]
{
    "objectGUID",
    "sAMAccountName",
    "displayName",
    "mail",
    "whenCreated"
};

SearchResponse SearchInAD(
    string ldapServer,
    int ldapPort,
    string domainForAD,
    string username,
    string password,
    string targetOU,
    string query,
    SearchScope scope,
    params string[] attributeList
    )
{
    // on Windows the authentication type is Negotiate, so there is no need to prepend
    // AD user login with domain. On other platforms at the moment only
    // Basic authentication is supported
    var authType = AuthType.Basic;

    //var connection = new LdapConnection(ldapServer)
    var connection = new LdapConnection(
        new LdapDirectoryIdentifier(ldapServer, ldapPort)
        )
    {
        AuthType = authType,
        Credential = new(username, password)
    };
    // the default one is v2 (at least in that version), and it is unknown if v3
    // is actually needed, but at least Synology LDAP works only with v3,
    // and since our Exchange doesn't complain, let it be v3
    connection.SessionOptions.ProtocolVersion = 3;

    // this is for connecting via LDAPS (636 port). It should be working,
    // according to https://github.com/dotnet/runtime/issues/43890,
    // but it doesn't (at least with Synology DSM LDAP), although perhaps
    // for a different reason
    //connection.SessionOptions.SecureSocketLayer = true;

    connection.Bind();

    var request = new SearchRequest(targetOU, query, scope, attributeList);

    return (SearchResponse)connection.SendRequest(request);
}

var searchResults = SearchInAD(
    AppConfiguration.Instance.LDAPConfig.LDAPserver,
    AppConfiguration.Instance.LDAPConfig.Port,
    AppConfiguration.Instance.LDAPConfig.Username,
    AppConfiguration.Instance.LDAPConfig.Password,
    AppConfiguration.Instance.LDAPConfig.LDAPQueryBase,
    new StringBuilder("(&")
        .Append("(objectCategory=person)")
        .Append("(objectClass=user)")
        .Append($"(memberOf={_configurationAD.Crew})")
        .Append("(!(userAccountControl:1.2.840.113556.1.4.803:=2))")
        .Append(")")
        .ToString(),
    SearchScope.Subtree,
    attributesToQuery
);

// Add services to the container.
builder.Services.AddRazorPages();
builder.Services.AddOpenApi();

var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Error");
}
else
{
    app.MapOpenApi();
    app.MapScalarApiReference();
}

app.UseRouting();

app.UseAuthorization();

app.MapStaticAssets();
app.MapRazorPages()
   .WithStaticAssets();

app.Run();