73 lines
2.4 KiB
C#
73 lines
2.4 KiB
C#
using System.Text.Json;
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using LehrerApp.Core.Models;
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namespace LehrerApp.Api;
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/// <summary>
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/// Server-seitiger Speicher für lesbare Snapshots.
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/// Eine JSON-Datei pro User – wird bei jedem Export überschrieben.
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/// Kein Ablauf-Datum – der letzte Stand bleibt bis zum nächsten Export.
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/// </summary>
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public class ReadableSnapshotStore
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{
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private readonly string _dataPath;
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private static readonly JsonSerializerOptions JsonOptions = new()
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{
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WriteIndented = false,
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PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
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};
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public ReadableSnapshotStore(string dataPath)
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{
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_dataPath = Path.Combine(dataPath, "readable");
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Directory.CreateDirectory(_dataPath);
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}
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// ── Speichern ─────────────────────────────────────────────────────────────
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public void Store(string userId, ReadableSnapshot snapshot)
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{
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var path = SnapshotPath(userId);
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var json = JsonSerializer.Serialize(snapshot, JsonOptions);
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File.WriteAllText(path, json);
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}
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// ── Laden ─────────────────────────────────────────────────────────────────
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public ReadableSnapshot? Load(string userId)
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{
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var path = SnapshotPath(userId);
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if (!File.Exists(path)) return null;
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try
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{
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var json = File.ReadAllText(path);
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return JsonSerializer.Deserialize<ReadableSnapshot>(json, JsonOptions);
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}
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catch
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{
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return null;
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}
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}
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/// <summary>
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/// Gibt nur die Metadaten zurück – für schnelle Freshness-Prüfung.
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/// </summary>
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public SnapshotMeta? LoadMeta(string userId)
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{
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var snapshot = Load(userId);
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return snapshot?.Meta;
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}
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// ── Hilfsmethoden ─────────────────────────────────────────────────────────
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private string SnapshotPath(string userId)
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{
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// Sanitize userId
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var safe = string.Concat(
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userId.Where(c => char.IsLetterOrDigit(c) || c == '-' || c == '_'));
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return Path.Combine(_dataPath, $"{safe}.json");
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}
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}
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