WorkTracker/Services/Auth/SingleUserSeedService.cs

using Microsoft.AspNetCore.Identity;
using Microsoft.Extensions.Options;
using WorkTracker.Configuration;
using WorkTracker.Data;

namespace WorkTracker.Services.Auth;

public sealed class SingleUserSeedService : IHostedService
{
    private readonly IServiceProvider serviceProvider;
    private readonly IOptions<SingleUserOptions> options;
    private readonly ILogger<SingleUserSeedService> logger;

    public SingleUserSeedService(
        IServiceProvider serviceProvider,
        IOptions<SingleUserOptions> options,
        ILogger<SingleUserSeedService> logger)
    {
        this.serviceProvider = serviceProvider;
        this.options = options;
        this.logger = logger;
    }

    public async Task StartAsync(CancellationToken cancellationToken)
    {
        if (!options.Value.SeedOnStartup)
        {
            return;
        }

        using var scope = serviceProvider.CreateScope();
        var userManager = scope.ServiceProvider.GetRequiredService<UserManager<ApplicationUser>>();

        var configuredEmail = options.Value.Email;
        var existingUser = await userManager.FindByEmailAsync(configuredEmail);

        if (existingUser is not null)
        {
            return;
        }

        var user = new ApplicationUser
        {
            UserName = configuredEmail,
            Email = configuredEmail,
            EmailConfirmed = true
        };

        var result = await userManager.CreateAsync(user, options.Value.Password);
        if (!result.Succeeded)
        {
            var errors = string.Join("; ", result.Errors.Select(x => x.Description));
            logger.LogError("Unable to seed single user account {Email}. Errors: {Errors}", configuredEmail, errors);
            return;
        }

        logger.LogInformation("Seeded single user account {Email}", configuredEmail);
    }

    public Task StopAsync(CancellationToken cancellationToken) => Task.CompletedTask;
}