23 lines
776 B
C#
23 lines
776 B
C#
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using System.Security.Cryptography;
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using System.Text;
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namespace w4c_workflows.Services;
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/// <summary>
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/// Deterministic, name-based GUIDs so recompiling the same YAML yields the same
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/// entity ids — this makes the git sync (re-compile to DB) idempotent.
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/// UUIDv5-style: SHA-256 of the seed, truncated to 16 bytes with version bits.
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/// </summary>
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public static class DeterministicGuid
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{
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public static Guid For(string seed)
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{
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var hash = SHA256.HashData(Encoding.UTF8.GetBytes(seed));
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Span<byte> bytes = stackalloc byte[16];
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hash.AsSpan(0, 16).CopyTo(bytes);
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bytes[6] = (byte)((bytes[6] & 0x0F) | 0x50); // version 5
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bytes[8] = (byte)((bytes[8] & 0x3F) | 0x80); // RFC 4122 variant
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return new Guid(bytes);
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}
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}
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