NexumNovus.AppSettings.Json 0.2.0

NexumNovus.AppSettings.Json

About

JSON configuration provider implementation for Microsoft.Extensions.Configuration. This package enables you to

• read application's settings from a JSON file.
• update application's settings and save changes to a JSON file.
• cryptographically protect settings

Use JsonConfigurationExtensions.AddJsonConfig extension method on IHostBuilder to add the JSON configuration provider to the configuration builder and register JsonSettingsRepository with service collection.

Use ISettingsRepository.UpdateSettingsAsync to update JSON settings file.

Mark properties with SecretSetting attribute to cryptographically protect them.

Example

using Microsoft.AspNetCore.Mvc;
using Microsoft.Extensions.Options;
using NexumNovus.AppSettings.Common;
using NexumNovus.AppSettings.Common.Secure;
using NexumNovus.AppSettings.Json;

var builder = WebApplication.CreateBuilder(args);

// Load settings from json file and register settings repository with service collection
builder.Host.AddJsonConfig("appsettings.json");

// Use of options pattern to register configuration elements is optional.
builder.Services.AddOptions<EmailSettings>().BindConfiguration(EmailSettings.ConfigElement);

var app = builder.Build();

// Api's to get and update EmailSettings
app.MapGet("/emailSettings", (IOptionsMonitor<EmailSettings> emailSettings) => emailSettings.CurrentValue);
app.MapPost("/emailSettings", async (EmailSettings emailSettings, ISettingsRepository settingsRepo)
  => await settingsRepo.UpdateSettingsAsync(EmailSettings.ConfigElement, emailSettings)
);

// Api's to get and update setting
app.MapGet("/settings", (string section, IConfiguration settings) => settings.GetSection(section));
app.MapPost("/settings", async (string section, string value, ISettingsRepository settingsRepo)
  => await settingsRepo.UpdateSettingsAsync(section, value)
);

app.Run();

public record EmailSettings
{
  public static string ConfigElement = "Email";
  public string Host { get; set; }
  public string Username { get; set; }
  [SecretSetting]
  public string Password { get; set; } //this setting will be cryptographically protected
} 

To run this example, include an appsettings.json file with the following content in your project:

{
  "Region": "demo",
  "Email": {
    "Host": "example.com",
    "Username": "",
    "Password": ""
  }
}

If a setting is not found in the configuration file, then it's created.

Note that password is marked with [SecretSetting] and it will be protected. After update appsettings.json will look like:

{
  "Region": "demo",
  "Email": {
    "Host": "example.dom",
    "Username": "my_username",
    "Password*": "CfDJ8IBGRtcA2S1Ji7VPVwaKmLYnTN6skE_2RQqvNZ8_CN5y3Xvk3LkFC6GXCe8EY7AicxH5...."
  }
}

Default implementation for ISecretProtector uses Microsoft.AspNetCore.DataProtection. You can also provide your own implementation:

builder.Host.AddJsonConfig(x =>
{
  x.Path = "appsettings.json",
  x.Protector = <your implementation of ISecretProtector>
});