accounts + argon2 migration

AobaServer/Models/AuthInfo.cs

@@ -0,0 +1,75 @@
+using MongoDB.Bson.IO;
+
+using System.Security.Cryptography;
+using System.Text.Json;
+
+namespace AobaServer.Models;
+
+public class AuthInfo
+{
+	public required string Issuer { get; set; }
+	public required string Audience { get; set; }
+	public required byte[] SecureKey { get; set; }
+
+	/// <summary>
+	/// Save this auth into in a json format to the sepcified file
+	/// </summary>
+	/// <param name="path">File path</param>
+	/// <returns></returns>
+	public AuthInfo Save(string path)
+	{
+		File.WriteAllText(path, JsonSerializer.Serialize(this));
+		return this;
+	}
+
+	/// <summary>
+	/// Generate a new Auth Info with newly generated keys
+	/// </summary>
+	/// <param name="issuer"></param>
+	/// <param name="audience"></param>
+	/// <returns></returns>
+	public static AuthInfo Create(string issuer, string audience)
+	{
+		var auth = new AuthInfo
+		{
+			Issuer = issuer,
+			Audience = audience,
+			SecureKey = GenetateJWTKey()
+		};
+		return auth;
+	}
+
+	/// <summary>
+	/// Load auth info from a json file
+	/// </summary>
+	/// <param name="path">File path</param>
+	/// <returns></returns>
+	internal static AuthInfo? Load(string path)
+	{
+		return JsonSerializer.Deserialize<AuthInfo>(File.ReadAllText(path));
+	}
+
+	internal static AuthInfo LoadOrCreate(string path, string issuer, string audience)
+	{
+		if (File.Exists(path))
+		{
+			var loaded = Load(path);
+			if (loaded != null)
+				return loaded;
+		}
+		var info = Create(issuer, audience);
+		info.Save(path);
+		return info;
+	}
+
+	/// <summary>
+	/// Generate a new key for use by JWT
+	/// </summary>
+	/// <returns></returns>
+	public static byte[] GenetateJWTKey(int size = 64)
+	{
+		var key = new byte[size];
+		RandomNumberGenerator.Fill(key);
+		return key;
+	}
+}