CSHARP-2764: Convert FLE examples from java doc to their c# equivalents.

Author: DmitryLukyanov

tests/MongoDB.Driver.Examples/ClientEncryptionExamples.cs

@@ -0,0 +1,138 @@
+/* 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 MongoDB.Driver.Core.Misc;
+using MongoDB.Driver.Core.TestHelpers.XunitExtensions;
+using System;
+using System.Collections.Generic;
+using System.Threading;
+using MongoDB.Bson;
+using MongoDB.Driver.Encryption;
+using Xunit;
+using Xunit.Abstractions;
+
+namespace MongoDB.Driver.Examples
+{
+    public class ClientEncryptionExamples
+    {
+        private const string LocalMasterKey = "Mng0NCt4ZHVUYUJCa1kxNkVyNUR1QURhZ2h2UzR2d2RrZzh0cFBwM3R6NmdWMDFBMUN3YkQ5aXRRMkhGRGdQV09wOGVNYUMxT2k3NjZKelhaQmRCZGJkTXVyZG9uSjFk";
+
+        private readonly ITestOutputHelper _output;
+
+        public ClientEncryptionExamples(ITestOutputHelper output)
+        {
+            _output = output;
+        }
+
+        [Fact]
+        public void ClientSideEncryptionSimpleTour()
+        {
+            RequireServer.Check().Supports(Feature.ClientSideEncryption);
+
+            var localMasterKey = Convert.FromBase64String(LocalMasterKey);
+
+            var kmsProviders = new Dictionary<string, IReadOnlyDictionary<string, object>>();
+            var localKey = new Dictionary<string, object>
+            {
+                { "key", localMasterKey }
+            };
+            kmsProviders.Add("local", localKey);
+
+            var keyVaultNamespace = CollectionNamespace.FromFullName("admin.datakeys");
+            var autoEncryptionOptions = new AutoEncryptionOptions(keyVaultNamespace, kmsProviders);
+
+            var mongoClientSettings = new MongoClientSettings
+            {
+                AutoEncryptionOptions = autoEncryptionOptions
+            };
+            var client = new MongoClient(mongoClientSettings);
+            var database = client.GetDatabase("test");
+            database.DropCollection("coll");
+            var collection = database.GetCollection<BsonDocument>("coll");
+
+            collection.InsertOne(new BsonDocument("encryptedField", "123456789"));
+
+            var result = collection.Find(FilterDefinition<BsonDocument>.Empty).First();
+            _output.WriteLine(result.ToJson());
+        }
+
+        [Fact]
+        public void ClientSideEncryptionAutoEncryptionSettingsTour()
+        {
+            RequireServer.Check().Supports(Feature.ClientSideEncryption);
+
+            var localMasterKey = Convert.FromBase64String(LocalMasterKey);
+
+            var kmsProviders = new Dictionary<string, IReadOnlyDictionary<string, object>>();
+            var localKey = new Dictionary<string, object>
+            {
+                { "key", localMasterKey }
+            };
+            kmsProviders.Add("local", localKey);
+
+            var keyVaultNamespace = CollectionNamespace.FromFullName("admin.datakeys");
+            var keyVaultMongoClient = new MongoClient();
+            var clientEncryptionSettings = new ClientEncryptionOptions(
+                keyVaultMongoClient,
+                keyVaultNamespace,
+                kmsProviders);
+
+            var clientEncryption = new ClientEncryption(clientEncryptionSettings);
+            var dataKeyId = clientEncryption.CreateDataKey("local", new DataKeyOptions(), CancellationToken.None);
+            var base64DataKeyId = Convert.ToBase64String(GuidConverter.ToBytes(dataKeyId, GuidRepresentation.Standard));
+            clientEncryption.Dispose();
+
+            var collectionNamespace = CollectionNamespace.FromFullName("test.coll");
+
+            var schemaMap = $@"{{
+                properties: {{
+                    encryptedField: {{
+                        encrypt: {{
+                            keyId: [{{
+                                '$binary' : {{
+                                    'base64' : '{base64DataKeyId}',
+                                    'subType' : '04'
+                                }}
+                            }}],
+                        bsonType: 'string',
+                        algorithm: 'AEAD_AES_256_CBC_HMAC_SHA_512-Deterministic'
+                        }}
+                    }}
+                }},
+                'bsonType': 'object'
+            }}";
+            var autoEncryptionSettings = new AutoEncryptionOptions(
+                keyVaultNamespace,
+                kmsProviders,
+                schemaMap: new Dictionary<string, BsonDocument>()
+                {
+                    { collectionNamespace.ToString(), BsonDocument.Parse(schemaMap) }
+                });
+            var clientSettings = new MongoClientSettings
+            {
+                AutoEncryptionOptions = autoEncryptionSettings
+            };
+            var client = new MongoClient(clientSettings);
+            var database = client.GetDatabase("test");
+            database.DropCollection("coll");
+            var collection = database.GetCollection<BsonDocument>("coll");
+
+            collection.InsertOne(new BsonDocument("encryptedField", "123456789"));
+
+            var result = collection.Find(FilterDefinition<BsonDocument>.Empty).First();
+            _output.WriteLine(result.ToJson());
+        }
+    }
+}