37 lines
1.3 KiB
C#
37 lines
1.3 KiB
C#
using System.Security.Cryptography;
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using System.Text;
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namespace Shared.Excel;
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public static class ImportSourceSignature
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{
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public static string Create(IEnumerable<string> columns)
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{
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var canonical = string.Join("|", columns.Select(Normalize).Order(StringComparer.Ordinal));
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return Convert.ToHexString(SHA256.HashData(Encoding.UTF8.GetBytes(canonical))).ToLowerInvariant();
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}
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private static string Normalize(string value) =>
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new(value.Where(char.IsLetterOrDigit).Select(char.ToLowerInvariant).ToArray());
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}
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public interface IImportMappingSuggester
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{
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Task<IReadOnlyList<ImportMapping>> SuggestAsync(
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IReadOnlyList<string> unmappedColumns,
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ImportDefinition definition,
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CancellationToken ct);
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}
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/// <summary>
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/// Safe default. A production AI adapter can replace this registration. The adapter must return
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/// only target fields present in ImportDefinition and never mutate data or persist a mapping by itself.
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/// </summary>
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public sealed class NoopImportMappingSuggester : IImportMappingSuggester
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{
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public Task<IReadOnlyList<ImportMapping>> SuggestAsync(
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IReadOnlyList<string> unmappedColumns,
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ImportDefinition definition,
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CancellationToken ct) => Task.FromResult<IReadOnlyList<ImportMapping>>([]);
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}
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