[#1] Add object Get operation + code quality

Signed-off-by: Ivan Pchelintsev <i.pchelintsev@yadro.com>

src/FrostFS.SDK.ClientV2/Client.cs

@@ -2,6 +2,7 @@ using System.Security.Cryptography;
 using FrostFS.Container;
 using FrostFS.Netmap;
 using FrostFS.Object;
+using FrostFS.SDK.ClientV2.Interfaces;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.Cryptography;
 using FrostFS.SDK.ModelsV2;

src/FrostFS.SDK.ClientV2/Interfaces/IFrostFSClient.cs

@@ -5,7 +5,7 @@ using DeleteResponse = FrostFS.Container.DeleteResponse;
 using GetResponse = FrostFS.Container.GetResponse;
 using PutResponse = FrostFS.Container.PutResponse;
 
-namespace FrostFS.SDK.ClientV2;
+namespace FrostFS.SDK.ClientV2.Interfaces;
 
 public interface IFrostFSClient
 {
@@ -14,6 +14,7 @@ public interface IFrostFSClient
     Task<GetResponse> GetContainerAsync(ContainerID containerId);
     Task<DeleteResponse> DeleteContainerAsync(ContainerID containerId);
     Task<HeadResponse> GetObjectHeadAsync(ContainerID containerId, ObjectID objectId);
-    Task<Object.PutResponse> PutObjectAsync(Object.Header header, Stream payload);
+    Task<Object.Object> GetObjectAsync(ContainerID containerId, ObjectID objectId);
+    Task<Object.PutResponse> PutObjectAsync(Header header, Stream payload);
     Task<Object.DeleteResponse> DeleteObjectAsync(ContainerID containerId, ObjectID objectId);
 }

src/FrostFS.SDK.ClientV2/Mappers/GRPC/Container.cs

@@ -19,14 +19,14 @@ public static class ContainerMapper
 
     public static ModelsV2.Container ToModel(this Container.Container container)
     {
-        var basicAclName = Enum.GetName(typeof(BasicACL), container.BasicAcl);
+        var basicAclName = Enum.GetName(typeof(BasicAcl), container.BasicAcl);
         if (basicAclName is null)
         {
             throw new ArgumentException($"Unknown BasicACL rule. Value: '{container.BasicAcl}'.");
         }
 
         return new ModelsV2.Container(
-            Enum.Parse<BasicACL>(basicAclName),
+            Enum.Parse<BasicAcl>(basicAclName),
             container.PlacementPolicy.ToModel()
         )
         {

src/FrostFS.SDK.ClientV2/Mappers/GRPC/Netmap/PlacementPolicy.cs

@@ -24,12 +24,9 @@ public static class PlacementPolicyMapper
 
     public static ModelsV2.Netmap.PlacementPolicy ToModel(this PlacementPolicy placementPolicy)
     {
-        var replicas = new List<Replica>();
+        return new ModelsV2.Netmap.PlacementPolicy(
-        foreach (var replica in placementPolicy.Replicas)
+            placementPolicy.Unique,
-        {
+            placementPolicy.Replicas.Select(replica => replica.ToModel()).ToArray()
-            replicas.Add(replica.ToModel());
+        );
-        }
-
-        return new ModelsV2.Netmap.PlacementPolicy(placementPolicy.Unique, replicas.ToArray());
     }
 }

src/FrostFS.SDK.ClientV2/Mappers/GRPC/Object.cs

@@ -52,20 +52,27 @@ public static class ObjectHeadMapper
             throw new ArgumentException($"Unknown ObjectType. Value: '{header.ObjectType}'.");
         }
 
-        var attributes = new List<ObjectAttribute>();
-        foreach (var attribute in header.Attributes)
-        {
-            attributes.Add(attribute.ToModel());
-        }
-
         return new ObjectHeader(
             ContainerId.FromHash(header.ContainerId.Value.ToByteArray()),
             Enum.Parse<ModelsV2.Enums.ObjectType>(objTypeName),
-            attributes.ToArray()
+            header.Attributes.Select(attribute => attribute.ToModel()).ToArray()
         )
         {
             Size = (long)header.PayloadLength,
             Version = header.Version.ToModel()
         };
     }
+}
+
+public static class ObjectMapper
+{
+    public static ModelsV2.Object ToModel(this Object.Object obj)
+    {
+        return new ModelsV2.Object
+        {
+            Header = obj.Header.ToModel(),
+            ObjectId = ObjectId.FromHash(obj.ObjectId.Value.ToByteArray()),
+            Payload = obj.Payload.ToByteArray()
+        };
+    }
 }

src/FrostFS.SDK.ClientV2/RequestConstructor.cs

@@ -3,6 +3,7 @@ using FrostFS.Refs;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.ModelsV2;
 using FrostFS.Session;
+using Version = FrostFS.SDK.ModelsV2.Version;
 
 namespace FrostFS.SDK.ClientV2;
 

src/FrostFS.SDK.ClientV2/RequestSigner.cs

@@ -18,14 +18,14 @@ namespace FrostFS.SDK.ClientV2
         public static byte[] SignRFC6979(this ECDsa key, byte[] data)
         {
             var digest = new Sha256Digest();
-            var secp256r1 = SecNamedCurves.GetByName("secp256r1");
+            var secp256R1 = SecNamedCurves.GetByName("secp256r1");
-            var ec_parameters = new ECDomainParameters(secp256r1.Curve, secp256r1.G, secp256r1.N);
+            var ecParameters = new ECDomainParameters(secp256R1.Curve, secp256R1.G, secp256R1.N);
-            var private_key = new ECPrivateKeyParameters(new BigInteger(1, key.PrivateKey()), ec_parameters);
+            var privateKey = new ECPrivateKeyParameters(new BigInteger(1, key.PrivateKey()), ecParameters);
             var signer = new ECDsaSigner(new HMacDsaKCalculator(digest));
             var hash = new byte[digest.GetDigestSize()];
             digest.BlockUpdate(data, 0, data.Length);
             digest.DoFinal(hash, 0);
-            signer.Init(true, private_key);
+            signer.Init(true, privateKey);
             var rs = signer.GenerateSignature(hash);
             var signature = new byte[RFC6979SignatureSize];
             var rbytes = rs[0].ToByteArrayUnsigned();
@@ -67,11 +67,11 @@ namespace FrostFS.SDK.ClientV2
 
         public static Signature SignMessagePart(this ECDsa key, IMessage? data)
         {
-            var data2sign = data is null ? Array.Empty<byte>() : data.ToByteArray();
+            var data2Sign = data is null ? Array.Empty<byte>() : data.ToByteArray();
             var sig = new Signature
             {
                 Key = ByteString.CopyFrom(key.PublicKey()),
-                Sign = ByteString.CopyFrom(key.SignData(data2sign)),
+                Sign = ByteString.CopyFrom(key.SignData(data2Sign)),
             };
             return sig;
         }

src/FrostFS.SDK.ClientV2/RequestVerifier.cs

@@ -24,19 +24,19 @@ namespace FrostFS.SDK.ClientV2 {
             return rs;
         }
 
-        public static bool VerifyRFC6979(this byte[] public_key, byte[] data, byte[] sig)
+        public static bool VerifyRFC6979(this byte[] publicKey, byte[] data, byte[] sig)
         {
-            if (public_key is null || data is null || sig is null) return false;
+            if (publicKey is null || data is null || sig is null) return false;
             var rs = DecodeSignature(sig);
             var digest = new Sha256Digest();
             var signer = new ECDsaSigner(new HMacDsaKCalculator(digest));
-            var secp256r1 = SecNamedCurves.GetByName("secp256r1");
+            var secp256R1 = SecNamedCurves.GetByName("secp256r1");
-            var ec_parameters = new ECDomainParameters(secp256r1.Curve, secp256r1.G, secp256r1.N);
+            var ecParameters = new ECDomainParameters(secp256R1.Curve, secp256R1.G, secp256R1.N);
-            var bc_public_key = new ECPublicKeyParameters(secp256r1.Curve.DecodePoint(public_key), ec_parameters);
+            var bcPublicKey = new ECPublicKeyParameters(secp256R1.Curve.DecodePoint(publicKey), ecParameters);
             var hash = new byte[digest.GetDigestSize()];
             digest.BlockUpdate(data, 0, data.Length);
             digest.DoFinal(hash, 0);
-            signer.Init(false, bc_public_key);
+            signer.Init(false, bcPublicKey);
             return signer.VerifySignature(hash, rs[0], rs[1]);
         }
 
@@ -54,8 +54,8 @@ namespace FrostFS.SDK.ClientV2 {
         {
             if (sig is null || sig.Key is null || sig.Sign is null) return false;
             using var key = sig.Key.ToByteArray().LoadPublicKey();
-            var data2verify = data is null ? Array.Empty<byte>() : data.ToByteArray();
+            var data2Verify = data is null ? Array.Empty<byte>() : data.ToByteArray();
-            return key.VerifyData(data2verify, sig.Sign.ToByteArray());
+            return key.VerifyData(data2Verify, sig.Sign.ToByteArray());
         }
 
         public static bool VerifyMatryoskaLevel(IMessage body, IMetaHeader meta, IVerificationHeader verification)
@@ -65,8 +65,7 @@ namespace FrostFS.SDK.ClientV2 {
             if (!verification.OriginSignature.VerifyMessagePart(origin)) return false;
             if (origin is null)
                 return verification.BodySignature.VerifyMessagePart(body);
-            if (verification.BodySignature is not null) return false;
+            return verification.BodySignature is null && VerifyMatryoskaLevel(body, meta.GetOrigin(), origin);
-            return VerifyMatryoskaLevel(body, meta.GetOrigin(), origin);
         }
 
         public static bool Verify(this IVerificableMessage message)

src/FrostFS.SDK.ClientV2/Services/Container.cs

@@ -65,25 +65,4 @@ public partial class Client
         request.Sign(_key);
         return await _containerServiceClient.DeleteAsync(request);
     }
-
-    // private void PrepareContainerSessionToken(RequestMetaHeader meta, SessionToken sessionToken, ContainerID? cid,
-    //     ContainerSessionContext.Types.Verb verb)
-    // {
-    //     if (meta.SessionToken is not null) return;
-    //     meta.SessionToken = sessionToken;
-    //     var ctx = new ContainerSessionContext
-    //     {
-    //         Verb = verb
-    //     };
-    //     if (cid is null)
-    //     {
-    //         ctx.Wildcard = true;
-    //     }
-    //     else
-    //     {
-    //         ctx.ContainerId = cid;
-    //     }
-    //     meta.SessionToken.Body.Container = ctx;
-    //     meta.SessionToken.Signature = _key.SignMessagePart(meta.SessionToken.Body);
-    // }
 }

src/FrostFS.SDK.ClientV2/Services/Object.cs

@@ -29,11 +29,64 @@ public partial class Client
         return await _objectServiceClient.HeadAsync(request);
     }
 
-    // public async Task<GetResponse> GetObjectAsync(ContainerID cid, ObjectID oid)
+    public async Task<Object.Object> GetObjectAsync(ContainerID cid, ObjectID oid)
-    // {
+    {
-    //     
+        var sessionToken = await CreateSessionAsync(uint.MaxValue);
-    // }
+        var request = new GetRequest
+        {
+            Body = new GetRequest.Types.Body
+            {
+                Raw = false,
+                Address = new Address
+                {
+                    ContainerId = cid,
+                    ObjectId = oid
+                },
+            }
+        };
+        request.AddMetaHeader();
+        request.AddObjectSessionToken(
+            sessionToken,
+            cid,
+            oid,
+            ObjectSessionContext.Types.Verb.Get,
+            _key
+        );
+        request.Sign(_key);
+
+        return await GetObject(request);
+    }
+
+    private async Task<Object.Object> GetObject(GetRequest request)
+    {
+        using var stream = GetObjectInit(request);
+        var obj = await stream.ReadHeader();
+        var payload = new byte[obj.Header.PayloadLength];
+        var offset = 0;
+        var chunk = await stream.ReadChunk();
+        while (chunk is not null)
+        {
+            chunk.CopyTo(payload, offset);
+            offset += chunk.Length;
+            chunk = await stream.ReadChunk();
+        }
+        obj.Payload = ByteString.CopyFrom(payload);
+        return obj;
+    }
     
+    private ObjectReader GetObjectInit(GetRequest initRequest)
+    {
+        if (initRequest is null)
+        {
+            throw new ArgumentNullException(nameof(initRequest));
+        }
+        
+        return new ObjectReader
+        {
+            Call = _objectServiceClient.Get(initRequest)
+        };
+    }
+
     public async Task<PutResponse> PutObjectAsync(Header header, Stream payload)
     {
         var sessionToken = await CreateSessionAsync(uint.MaxValue);
@@ -63,7 +116,7 @@ public partial class Client
         );
         request.Sign(_key);
 
-        using var stream = await InitObject(request);
+        using var stream = await PutObjectInit(request);
         var buffer = new byte[Constants.ObjectChunkSize];
         var bufferLength = payload.Read(buffer, 0, Constants.ObjectChunkSize);
         while (bufferLength > 0)
@@ -81,7 +134,7 @@ public partial class Client
         return await stream.Close();
     }
 
-    private async Task<ObjectStreamer> InitObject(PutRequest initRequest)
+    private async Task<ObjectStreamer> PutObjectInit(PutRequest initRequest)
     {
         if (initRequest is null)
         {
@@ -112,14 +165,47 @@ public partial class Client
     }
 }
 
-internal class ObjectStreamer : IDisposable
+internal class ObjectReader : IDisposable
 {
-    public AsyncClientStreamingCall<PutRequest, PutResponse> Call { get; init; }
+    public AsyncServerStreamingCall<GetResponse> Call { get; init; }
+
+    public async Task<Object.Object> ReadHeader()
+    {
+        if (!await Call.ResponseStream.MoveNext())
+        {
+            throw new InvalidOperationException("unexpect end of stream");
+        }
+        var response = Call.ResponseStream.Current;
+        if (response.Body.ObjectPartCase != GetResponse.Types.Body.ObjectPartOneofCase.Init)
+            throw new InvalidOperationException("unexpect message type");
+        return new Object.Object
+        {
+            ObjectId = response.Body.Init.ObjectId,
+            Header = response.Body.Init.Header,
+        };
+    }
+
+    public async Task<byte[]?> ReadChunk()
+    {
+        if (!await Call.ResponseStream.MoveNext())
+        {
+            return null;
+        }
+        var response = Call.ResponseStream.Current;
+        if (response.Body.ObjectPartCase != GetResponse.Types.Body.ObjectPartOneofCase.Chunk)
+            throw new InvalidOperationException("unexpect message type");
+        return response.Body.Chunk.ToByteArray();
+    }
 
     public void Dispose()
     {
         Call.Dispose();
     }
+}
+
+internal class ObjectStreamer : IDisposable
+{
+    public AsyncClientStreamingCall<PutRequest, PutResponse> Call { get; init; }
 
     public async Task Write(PutRequest request)
     {
@@ -136,4 +222,9 @@ internal class ObjectStreamer : IDisposable
         await Call.RequestStream.CompleteAsync();
         return await Call.ResponseAsync;
     }
-}
+    
+    public void Dispose()
+    {
+        Call.Dispose();
+    }
+}

src/FrostFS.SDK.Cryptography/ArrayHelper.cs

@@ -7,12 +7,11 @@ namespace FrostFS.SDK.Cryptography
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
         public static byte[] Concat(params byte[][] buffers)
         {
-            int length = 0;
+            var length = buffers.Sum(buffer => buffer.Length);
-            for (int i = 0; i < buffers.Length; i++)
+
-                length += buffers[i].Length;
+            var dst = new byte[length];
-            byte[] dst = new byte[length];
+            var p = 0;
-            int p = 0;
+            foreach (var src in buffers)
-            foreach (byte[] src in buffers)
             {
                 Buffer.BlockCopy(src, 0, dst, p, src.Length);
                 p += src.Length;

src/FrostFS.SDK.Cryptography/Key.cs

@@ -22,8 +22,8 @@ public static class KeyExtension
                 $"{nameof(Compress)} argument isn't uncompressed public key. " +
                 $"expected length={UncompressedPublicKeyLength}, actual={publicKey.Length}"
             );
-        var secp256r1 = SecNamedCurves.GetByName("secp256r1");
+        var secp256R1 = SecNamedCurves.GetByName("secp256r1");
-        var point = secp256r1.Curve.DecodePoint(publicKey);
+        var point = secp256R1.Curve.DecodePoint(publicKey);
         return point.GetEncoded(true);
     }
 
@@ -34,8 +34,8 @@ public static class KeyExtension
                 $"{nameof(Decompress)} argument isn't compressed public key. " +
                 $"expected length={CompressedPublicKeyLength}, actual={publicKey.Length}"
             );
-        var secp256r1 = SecNamedCurves.GetByName("secp256r1");
+        var secp256R1 = SecNamedCurves.GetByName("secp256r1");
-        var point = secp256r1.Curve.DecodePoint(publicKey);
+        var point = secp256R1.Curve.DecodePoint(publicKey);
         return point.GetEncoded(false);
     }
 
@@ -115,19 +115,19 @@ public static class KeyExtension
         return key.ExportParameters(true).D;
     }
 
-    public static ECDsa LoadPrivateKey(this byte[] private_key)
+    public static ECDsa LoadPrivateKey(this byte[] privateKey)
     {
-        var secp256r1 = SecNamedCurves.GetByName("secp256r1");
+        var secp256R1 = SecNamedCurves.GetByName("secp256r1");
-        var public_key =
+        var publicKey =
-            secp256r1.G.Multiply(new Org.BouncyCastle.Math.BigInteger(1, private_key)).GetEncoded(false)[1..];
+            secp256R1.G.Multiply(new Org.BouncyCastle.Math.BigInteger(1, privateKey)).GetEncoded(false)[1..];
         var key = ECDsa.Create(new ECParameters
         {
             Curve = ECCurve.NamedCurves.nistP256,
-            D = private_key,
+            D = privateKey,
             Q = new ECPoint
             {
-                X = public_key[..32],
+                X = publicKey[..32],
-                Y = public_key[32..]
+                Y = publicKey[32..]
             }
         });
         return key;
@@ -135,20 +135,20 @@ public static class KeyExtension
 
     public static ECDsa LoadWif(this string wif)
     {
-        var private_key = GetPrivateKeyFromWIF(wif);
+        var privateKey = GetPrivateKeyFromWIF(wif);
-        return LoadPrivateKey(private_key);
+        return LoadPrivateKey(privateKey);
     }
 
-    public static ECDsa LoadPublicKey(this byte[] public_key)
+    public static ECDsa LoadPublicKey(this byte[] publicKey)
     {
-        var public_key_full = public_key.Decompress()[1..];
+        var publicKeyFull = publicKey.Decompress()[1..];
         var key = ECDsa.Create(new ECParameters
         {
             Curve = ECCurve.NamedCurves.nistP256,
             Q = new ECPoint
             {
-                X = public_key_full[..32],
+                X = publicKeyFull[..32],
-                Y = public_key_full[32..]
+                Y = publicKeyFull[32..]
             }
         });
         return key;

src/FrostFS.SDK.ModelsV2/Container.cs

@@ -6,11 +6,11 @@ namespace FrostFS.SDK.ModelsV2;
 public class Container
 {
     public Guid Nonce { get; set; }
-    public BasicACL BasicAcl { get; set; }
+    public BasicAcl BasicAcl { get; set; }
     public PlacementPolicy PlacementPolicy { get; set; }
     public Version Version { get; set; }
 
-    public Container(BasicACL basicAcl, PlacementPolicy placementPolicy)
+    public Container(BasicAcl basicAcl, PlacementPolicy placementPolicy)
     {
         Nonce = Guid.NewGuid();
         BasicAcl = basicAcl;

src/FrostFS.SDK.ModelsV2/ContainerId.cs

@@ -4,7 +4,7 @@ namespace FrostFS.SDK.ModelsV2;
 
 public class ContainerId
 {
-    public string Value { get; }
+    public string Value { get; set; }
 
     public ContainerId(string id)
     {

src/FrostFS.SDK.ModelsV2/Enums/BasicAcl.cs

@@ -2,7 +2,7 @@ using System.ComponentModel;
 
 namespace FrostFS.SDK.ModelsV2.Enums;
 
-public enum BasicACL
+public enum BasicAcl
 { 
     [Description("Basic ACL for private container")]
     Private = 0x1C8C8CCC,

src/FrostFS.SDK.ModelsV2/Object.cs

@@ -37,5 +37,6 @@ public class ObjectHeader
 public class Object
 {
     public ObjectHeader Header { get; set; }
-    public Stream Payload { get; set; }
+    public ObjectId ObjectId { get; set; }
+    public byte[] Payload { get; set; }
 }

src/FrostFS.SDK.Service/Service.cs

@@ -1,4 +1,5 @@
 using FrostFS.SDK.ClientV2;
+using FrostFS.SDK.ClientV2.Interfaces;
 using FrostFS.SDK.ClientV2.Mappers.GRPC;
 using FrostFS.SDK.ModelsV2;
 
@@ -16,14 +17,11 @@ public class FrostFsService
 
     public async Task<ContainerId[]> ListContainersAsync()
     {
-        var containersIds = new List<ContainerId>();
         var listContainersResponse = await _client.ListContainersAsync();
-        foreach (var cid in listContainersResponse.Body.ContainerIds)
-        {
-            containersIds.Add(ContainerId.FromHash(cid.Value.ToByteArray()));
-        }
 
-        return containersIds.ToArray();
+        return listContainersResponse.Body.ContainerIds.Select(
+            cid => ContainerId.FromHash(cid.Value.ToByteArray())
+        ).ToArray();
     }
 
     public async Task<ContainerId> CreateContainerAsync(ModelsV2.Container container)
@@ -52,12 +50,21 @@ public class FrostFsService
         return getObjectHeadResponse.Body.Header.Header.ToModel();
     }
 
+    public async Task<ModelsV2.Object> GetObjectAsync(ContainerId containerId, ObjectId objectId)
+    {
+        var obj = await _client.GetObjectAsync(
+            containerId.ToGrpcMessage(),
+            objectId.ToGrpcMessage()
+        );
+        return obj.ToModel();
+    }
+
     public async Task<ObjectId> PutObjectAsync(ObjectHeader header, Stream payload)
     {
         var putObjectResponse = await _client.PutObjectAsync(header.ToGrpcMessage(), payload);
         return ObjectId.FromHash(putObjectResponse.Body.ObjectId.Value.ToByteArray());
     }
-    
+
     public async Task<ObjectId> PutObjectAsync(ObjectHeader header, byte[] payload)
     {
         var putObjectResponse = await _client.PutObjectAsync(header.ToGrpcMessage(), new MemoryStream(payload));