56 lines
2.2 KiB
C#
56 lines
2.2 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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using System.Text.Json;
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namespace MSCO.Server;
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/// <summary>
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/// Letzte erfolgreiche Lizenzprüfung beim Master (data/license.json). Ist der Master mal nicht erreichbar oder lehnt
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/// den Schlüssel kurz ab (z.B. nach einem Umzug ohne keys.json), läuft bzw. startet der Server damit weiter - bis
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/// LicenseGraceHours ohne Bestätigung vergangen sind. Gespeichert wird nur ein Hash des Schlüssels.
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/// </summary>
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public static class LicenseCache
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{
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public sealed class Entry
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{
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public string KeyHash { get; set; }
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public string Owner { get; set; }
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public string Label { get; set; }
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public DateTime LastConfirmedUtc { get; set; }
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}
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static string PathOf(string dataDir) => Path.Combine(dataDir, "license.json");
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static string Hash(string key) =>
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Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(key ?? ""))).ToLowerInvariant();
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/// <summary>Gemerkte Bestätigung für genau diesen Schlüssel (null = keine).</summary>
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public static Entry Load(string dataDir, string key)
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{
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try
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{
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string path = PathOf(dataDir);
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if (!File.Exists(path)) return null;
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var entry = JsonSerializer.Deserialize<Entry>(File.ReadAllText(path));
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return entry != null && entry.KeyHash == Hash(key) ? entry : null;
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}
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catch { return null; }
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}
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public static void Save(string dataDir, string key, string owner, string label, DateTime confirmedUtc)
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{
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try
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{
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var entry = new Entry { KeyHash = Hash(key), Owner = owner, Label = label, LastConfirmedUtc = confirmedUtc };
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string path = PathOf(dataDir), tmp = path + ".tmp";
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File.WriteAllText(tmp, JsonSerializer.Serialize(entry, new JsonSerializerOptions { WriteIndented = true }));
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File.Move(tmp, path, true);
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}
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catch (Exception e) { GameServer.Log("Could not remember the license check: " + e.Message); }
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}
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/// <summary>"3 h", "2 d 4 h" ...</summary>
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public static string Span(TimeSpan t) =>
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t.TotalHours < 1 ? $"{Math.Max(1, (int)t.TotalMinutes)} min" : t.TotalDays < 1 ? $"{(int)t.TotalHours} h" : $"{(int)t.TotalDays} d {t.Hours} h";
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}
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