Adding of archive items is mostly operational. Need to handle file upload

OpenArchival.Database/ArtifactTypes/ArtifactTypesProvider.cs

@@ -0,0 +1,63 @@
+using Npgsql;
+using Dapper;
+
+namespace OpenArchival.Database;
+
+public class ArtifactTypesProvider : IArtifactTypesProvider
+{
+    private NpgsqlDataSource _dataSource;
+
+    public ArtifactTypesProvider(NpgsqlDataSource dataSource)
+    {
+        _dataSource = dataSource;
+    }
+
+    public async Task<bool> ContainsType(string type)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @"SELECT EXISTS(SELECT 1 FROM artifacttypes WHERE type = @Value)";
+
+        return await connection.ExecuteScalarAsync<bool>(sql, new { Value=type});
+    } 
+
+    public async Task<bool> AddType(string type)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @"INSERT INTO artifacttypes (type) VALUES (@Type)";
+
+        int rowsAffected = await connection.ExecuteAsync(sql, new { Type = type });
+
+        return rowsAffected == 1;
+    }
+
+    public async Task<bool> RemoveType(string type)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @"DELETE FROM artifacttypes WHERE value = @Value";
+
+        int rowsAffected = await connection.ExecuteAsync(sql, new { Value = type });
+
+        return rowsAffected > 0;
+    }
+
+    public async Task<IEnumerable<string>> SearchTypes(string query)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @"SELECT type FROM artifacttypes WHERE POSITION(LOWER(@Query) in LOWER(type)) > 0";
+
+        return await connection.QueryAsync<string>(sql, new {Query=query});
+    }
+
+    public async Task<IEnumerable<string>> TopTypes(int resultCount)
+    {
+        await using var connection = await _dataSource.OpenConnectionAsync();
+
+        var sql = @$"SELECT type FROM artifacttypes ORDER BY type ASC LIMIT {resultCount}";
+
+        return await connection.QueryAsync<string>(sql);
+    }
+}

OpenArchival.Database/ArtifactTypes/IArtifactTypesProvider.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace OpenArchival.Database;
+
+public interface IArtifactTypesProvider
+{
+    public Task<bool> ContainsType(string type);
+
+    public Task<bool> AddType(string type);
+
+    public Task<bool> RemoveType(string type);
+
+    public Task<IEnumerable<string>> SearchTypes(string query);
+
+    public Task<IEnumerable<string>> TopTypes(int resultCount);
+}