90 lines
2.8 KiB
C#
90 lines
2.8 KiB
C#
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using System;
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using System.IO;
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using System.Text;
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namespace UnityEngine.Purchasing
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{
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/// <summary>
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/// Records processed transactions on the file system
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/// for de duplication purposes.
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/// </summary>
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internal class TransactionLog
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{
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private readonly ILogger logger;
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private readonly string persistentDataPath;
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public TransactionLog(ILogger logger, string persistentDataPath)
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{
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this.logger = logger;
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if (!string.IsNullOrEmpty(persistentDataPath))
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{
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this.persistentDataPath = Path.Combine(Path.Combine(persistentDataPath, "Unity"), "UnityPurchasing");
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}
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}
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/// <summary>
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/// Removes all transactions from the log.
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/// </summary>
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public void Clear()
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{
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Directory.Delete(persistentDataPath, true);
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}
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public bool HasRecordOf(string transactionID)
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{
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if (string.IsNullOrEmpty(transactionID) || string.IsNullOrEmpty(persistentDataPath))
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{
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return false;
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}
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return Directory.Exists(GetRecordPath(transactionID));
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}
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public void Record(string transactionID)
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{
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// Consumables have additional de-duplication logic.
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if (!(string.IsNullOrEmpty(transactionID) || string.IsNullOrEmpty(persistentDataPath)))
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{
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var path = GetRecordPath(transactionID);
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try
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{
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Directory.CreateDirectory(path);
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}
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catch (Exception recordPathException)
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{
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// A wide variety of exceptions can occur, for all of which
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// nothing is the best course of action.
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logger.LogException(recordPathException);
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}
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}
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}
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private string GetRecordPath(string transactionID)
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{
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return Path.Combine(persistentDataPath, ComputeHash(transactionID));
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}
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/// <summary>
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/// Compute a 64 bit Knuth hash of a transaction ID.
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/// This should be more than sufficient for the few thousand maximum
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/// products expected in an App.
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/// </summary>
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internal static string ComputeHash(string transactionID)
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{
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var hash = 3074457345618258791ul;
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for (var i = 0; i < transactionID.Length; i++)
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{
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hash += transactionID[i];
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hash *= 3074457345618258799ul;
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}
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var builder = new StringBuilder(16);
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foreach (var b in BitConverter.GetBytes(hash))
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{
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builder.AppendFormat("{0:X2}", b);
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}
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return builder.ToString();
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}
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}
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}
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