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40 lines
1.7 KiB
C#
40 lines
1.7 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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namespace AIStudio.Assistants.BeyondFactsLab;
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/// <summary>
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/// Gives each chat of the BeyondFacts Lab an ID which follows from where it lives.
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/// </summary>
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/// <remarks>
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/// The provenance store keeps what a chat received by the ID of the chat, and its cleanup at the start removes what
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/// belongs to no chat on the disk. With IDs which follow from the preparation and the step, the cleanup finds the
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/// chats of the lab from the folders alone, without reading a single chat; see ProvenanceCleanup. A chat started
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/// over keeps its ID, so what the old conversation received becomes unreferenced and goes at the next cleanup.
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/// The ID is a version 8 UUID after RFC 9562, built from a SHA-256 hash.
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/// </remarks>
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public static class BflThreadId
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{
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/// <summary>
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/// What sets the IDs of the lab apart from any other name-based ID.
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/// </summary>
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private const string NAMESPACE = "beyondfacts-lab/thread/";
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/// <summary>
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/// Gets the ID of the chat of a step.
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/// </summary>
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/// <param name="projectId">The ID of the preparation.</param>
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/// <param name="step">The step.</param>
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/// <returns>The ID, the same on every computer and in every run.</returns>
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public static Guid Of(Guid projectId, BflStep step)
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{
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var name = Encoding.UTF8.GetBytes($"{NAMESPACE}{projectId:D}/{step.FolderName}");
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Span<byte> hash = stackalloc byte[SHA256.HashSizeInBytes];
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SHA256.HashData(name, hash);
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var bytes = hash[..16];
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bytes[6] = (byte)((bytes[6] & 0x0F) | 0x80);
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bytes[8] = (byte)((bytes[8] & 0x3F) | 0x80);
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return new Guid(bytes, bigEndian: true);
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}
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} |