32 lines
1.2 KiB
C#
32 lines
1.2 KiB
C#
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using System.Security.Cryptography;
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using System.Text;
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using EventFlow.Core;
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namespace Books.Api.Domain.Accounts;
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public class AccountId(string value) : Identity<AccountId>(value)
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{
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/// <summary>
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/// Creates a deterministic AccountId based on company and account number.
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/// This prevents duplicate accounts even with race conditions.
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/// Uses SHA256 to generate a deterministic GUID from the input.
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/// </summary>
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public static AccountId FromCompanyAndNumber(string companyId, string accountNumber)
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{
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// Create a deterministic GUID from the company ID and account number
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var input = $"{companyId}:{accountNumber}";
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var hash = SHA256.HashData(Encoding.UTF8.GetBytes(input));
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// Use the first 16 bytes of the hash to create a GUID
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var guidBytes = new byte[16];
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Array.Copy(hash, guidBytes, 16);
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// Set version (4) and variant bits to make it a valid UUID
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guidBytes[6] = (byte)((guidBytes[6] & 0x0F) | 0x40); // Version 4
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guidBytes[8] = (byte)((guidBytes[8] & 0x3F) | 0x80); // Variant 1
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var deterministicGuid = new Guid(guidBytes);
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return new AccountId($"account-{deterministicGuid:D}");
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}
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}
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