Joseph Doherty
26 lines
1.2 KiB
C#
26 lines
1.2 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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namespace ZB.MOM.WW.OtOpcUa.Core.AlarmHistorian;
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/// <summary>Stable delivery GUIDs for persisted alarm queue rows.</summary>
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public static class AlarmDeliveryIds
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{
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/// <summary>
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/// Converts an existing durable row key into a nonzero version-8 GUID. Version 1 of this encoding hashes
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/// UTF-8 "OtOpcUa.AlarmDelivery/v1\0" followed by the exact persisted key with SHA-256, takes the first
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/// 16 bytes, sets the UUID version/variant bits, and interprets the bytes in network order.
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/// This encoding must remain stable across retries, upgrades and replicated failover.
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/// </summary>
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/// <param name="queueId">The persisted row key, never a hash recomputed from the current payload.</param>
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/// <returns>The row's stable delivery identity.</returns>
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public static Guid FromQueueId(string queueId)
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{
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ArgumentException.ThrowIfNullOrWhiteSpace(queueId);
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var digest = SHA256.HashData(Encoding.UTF8.GetBytes("OtOpcUa.AlarmDelivery/v1\0" + queueId));
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digest[6] = (byte)((digest[6] & 0x0F) | 0x80);
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digest[8] = (byte)((digest[8] & 0x3F) | 0x80);
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return new Guid(digest.AsSpan(0, 16), bigEndian: true);
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}
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}
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