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CryptClientCreator.cs
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CryptClientCreator.cs
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/* Copyright 2019-present MongoDB Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
using System;
using System.Collections.Generic;
using System.Linq;
using MongoDB.Bson;
using MongoDB.Bson.IO;
using MongoDB.Driver.Core.Configuration;
using MongoDB.Driver.Core.Misc;
using MongoDB.Libmongocrypt;
namespace MongoDB.Driver.Core.Clusters
{
/// <summary>
/// Represents a creator for CryptClient.
/// </summary>
public sealed class CryptClientCreator
{
#region static
#pragma warning disable 3002
/// <summary>
/// Create a CryptClient instance.
/// </summary>
/// <param name="cryptClientSettings">Crypt client settings.</param>
/// <returns>The CryptClient instance.</returns>
public static CryptClient CreateCryptClient(CryptClientSettings cryptClientSettings)
{
var helper = new CryptClientCreator(cryptClientSettings);
var cryptOptions = helper.CreateCryptOptions();
return helper.CreateCryptClient(cryptOptions);
}
#pragma warning restore
#endregion
private readonly CryptClientSettings _cryptClientSettings;
private CryptClientCreator(CryptClientSettings cryptClientSettings)
{
_cryptClientSettings = Ensure.IsNotNull(cryptClientSettings, nameof(cryptClientSettings));
}
private CryptClient CreateCryptClient(CryptOptions options) =>
CryptClientFactory.Create(options);
private CryptOptions CreateCryptOptions()
{
List<KmsCredentials> kmsProviders = null;
if (_cryptClientSettings.KmsProviders?.Count > 0)
{
kmsProviders = new List<KmsCredentials>();
foreach (var kmsProvider in _cryptClientSettings.KmsProviders)
{
var kmsTypeDocumentKey = kmsProvider.Key.ToLower();
var kmsProviderDocument = CreateProviderDocument(kmsTypeDocumentKey, kmsProvider.Value);
var kmsCredentials = new KmsCredentials(credentialsBytes: kmsProviderDocument.ToBson());
kmsProviders.Add(kmsCredentials);
}
}
else
{
throw new ArgumentException("At least one kms provider must be specified");
}
byte[] schemaBytes = null;
if (_cryptClientSettings.SchemaMap != null)
{
schemaBytes = GetBytesFromMap(_cryptClientSettings.SchemaMap);
}
byte[] encryptedFieldsBytes = null;
if (_cryptClientSettings.EncryptedFieldsMap != null)
{
encryptedFieldsBytes = GetBytesFromMap(_cryptClientSettings.EncryptedFieldsMap);
}
return new CryptOptions(
kmsProviders,
encryptedFieldsMap: encryptedFieldsBytes,
schema: schemaBytes,
bypassQueryAnalysis: _cryptClientSettings.BypassQueryAnalysis.GetValueOrDefault(false),
_cryptClientSettings.CryptSharedLibPath,
_cryptClientSettings.CryptSharedLibSearchPath,
_cryptClientSettings.IsCryptSharedLibRequired ?? false);
}
private BsonDocument CreateProviderDocument(string kmsType, IReadOnlyDictionary<string, object> data)
{
var providerContent = new BsonDocument();
foreach (var record in data)
{
providerContent.Add(new BsonElement(record.Key, BsonValue.Create(record.Value)));
}
var providerDocument = new BsonDocument(kmsType, providerContent);
return providerDocument;
}
private byte[] GetBytesFromMap(IReadOnlyDictionary<string, BsonDocument> map)
{
var mapElements = map.Select(c => new BsonElement(c.Key, c.Value));
var mapDocument = new BsonDocument(mapElements);
#pragma warning disable 618
var writerSettings = new BsonBinaryWriterSettings();
if (BsonDefaults.GuidRepresentationMode == GuidRepresentationMode.V2)
{
writerSettings.GuidRepresentation = GuidRepresentation.Unspecified;
}
#pragma warning restore 618
return mapDocument.ToBson(writerSettings: writerSettings);
}
}
}