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36 lines
1.4 KiB
C#
36 lines
1.4 KiB
C#
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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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/// Derives the ID under which the BeyondFacts Lab stores the research on one person from the name of the person.
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/// </summary>
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/// <remarks>
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/// The ID follows from the name alone, see BflParticipant.NameKey, so that the research on a person is found again
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/// after the list of participants was researched anew, and no path is stored. It is a UUID of version 8 built from
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/// SHA-256, like BflThreadId.
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/// </remarks>
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public static class BflPersonId
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{
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/// <summary>
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/// What comes before every name, so that these IDs never meet those of other kinds.
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/// </summary>
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private const string NAMESPACE = "beyondfacts-lab/person/";
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/// <summary>
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/// Gets the ID of a person.
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/// </summary>
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/// <param name="name">The name of the person; case and the spaces between its words do not count.</param>
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public static Guid Of(string name)
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{
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var bytesOfName = Encoding.UTF8.GetBytes($"{NAMESPACE}{BflParticipant.NameKey(name)}");
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Span<byte> hash = stackalloc byte[SHA256.HashSizeInBytes];
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SHA256.HashData(bytesOfName, 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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}
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