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

@@ -11,5 +11,7 @@ public interface IFrostFSClient
     Task<ObjectHeader> GetObjectHeadAsync(ContainerId containerId, ObjectId objectId);
     Task<ModelsV2.Object> GetObjectAsync(ContainerId containerId, ObjectId objectId);
     Task<ObjectId> PutObjectAsync(ObjectHeader header, Stream payload);
+    Task<ObjectId> PutObjectAsync(ObjectHeader header, byte[] payload);
     Task DeleteObjectAsync(ContainerId containerId, ObjectId objectId);
+    Task<ObjectId[]> SearchObjectAsync(ContainerId cid, params ObjectFilter[] filters);
 }

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

@@ -1,5 +1,7 @@
 using FrostFS.Object;
 using FrostFS.SDK.ModelsV2;
+using MatchType = FrostFS.Object.MatchType;
+using ObjectType = FrostFS.Object.ObjectType;
 
 namespace FrostFS.SDK.ClientV2.Mappers.GRPC;
 
@@ -20,7 +22,26 @@ public static class ObjectAttributeMapper
     }
 }
 
-public static class ObjectHeadMapper
+public static class ObjectFilterMapper
+{
+    public static SearchRequest.Types.Body.Types.Filter ToGrpcMessage(this ObjectFilter filter)
+    {
+        var objMatchTypeName = Enum.GetName(typeof(MatchType), filter.MatchType);
+        if (objMatchTypeName is null)
+        {
+            throw new ArgumentException($"Unknown MatchType. Value: '{filter.MatchType}'.");
+        }
+
+        return new SearchRequest.Types.Body.Types.Filter
+        {
+            MatchType = Enum.Parse<MatchType>(objMatchTypeName),
+            Key = filter.Key,
+            Value = filter.Value
+        };
+    }    
+}
+
+public static class ObjectHeaderMapper
 {
     public static Header ToGrpcMessage(this ObjectHeader header)
     {

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

@@ -72,17 +72,18 @@ public partial class Client
             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)
@@ -90,6 +91,16 @@ public partial class Client
     }
 
     public async Task<ObjectId> PutObjectAsync(ObjectHeader header, Stream payload)
+    {
+        return await PutObject(header, payload);
+    }
+
+    public async Task<ObjectId> PutObjectAsync(ObjectHeader header, byte[] payload)
+    {
+        return await PutObject(header, new MemoryStream(payload));
+    }
+    
+    private async Task<ObjectId> PutObject(ObjectHeader header, Stream payload)
     {
         var sessionToken = await CreateSessionAsync(uint.MaxValue);
         var hdr = header.ToGrpcMessage();
@@ -167,6 +178,56 @@ public partial class Client
         request.Sign(_key);
         await _objectServiceClient.DeleteAsync(request);
     }
+
+    public async Task<ObjectId[]> SearchObjectAsync(ContainerId cid, params ObjectFilter[] filters)
+    {
+        var request = new SearchRequest
+        {
+            Body = new SearchRequest.Types.Body
+            {
+                ContainerId = cid.ToGrpcMessage(),
+                Filters = { },
+                Version = 1
+            }
+        };
+        foreach (var filter in filters)
+        {
+            request.Body.Filters.Add(filter.ToGrpcMessage());
+        }
+
+        ;
+        request.AddMetaHeader();
+        request.Sign(_key);
+        var ids = await SearchObject(request);
+        return ids.Select(oid => ObjectId.FromHash(oid.Value.ToByteArray())).ToArray();
+    }
+
+    private async Task<List<ObjectID>> SearchObject(SearchRequest request)
+    {
+        var objectsIds = new List<ObjectID> { };
+        using var stream = SearchObjectInit(request);
+        var ids = await stream.Read();
+        while (ids is not null)
+        {
+            objectsIds.AddRange(ids);
+            ids = await stream.Read();
+        }
+
+        return objectsIds;
+    }
+
+    private SearchReader SearchObjectInit(SearchRequest initRequest)
+    {
+        if (initRequest is null)
+        {
+            throw new ArgumentNullException(nameof(initRequest));
+        }
+
+        return new SearchReader
+        {
+            Call = _objectServiceClient.Search(initRequest)
+        };
+    }
 }
 
 internal class ObjectReader : IDisposable
@@ -179,6 +240,7 @@ internal class ObjectReader : IDisposable
         {
             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");
@@ -195,6 +257,7 @@ internal class ObjectReader : IDisposable
         {
             return null;
         }
+
         var response = Call.ResponseStream.Current;
         if (response.Body.ObjectPartCase != GetResponse.Types.Body.ObjectPartOneofCase.Chunk)
             throw new InvalidOperationException("unexpect message type");
@@ -226,9 +289,30 @@ internal class ObjectStreamer : IDisposable
         await Call.RequestStream.CompleteAsync();
         return await Call.ResponseAsync;
     }
-    
+
     public void Dispose()
     {
         Call.Dispose();
     }
 }
+
+internal class SearchReader : IDisposable
+{
+    public AsyncServerStreamingCall<SearchResponse> Call { get; init; }
+
+    public async Task<List<ObjectID>?> Read()
+    {
+        if (!await Call.ResponseStream.MoveNext())
+        {
+            return null;
+        }
+
+        var response = Call.ResponseStream.Current;
+        return response.Body?.IdList.ToList();
+    }
+
+    public void Dispose()
+    {
+        Call.Dispose();
+    }
+}

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

@@ -0,0 +1,10 @@
+namespace FrostFS.SDK.ModelsV2.Enums;
+
+public enum ObjectMatchType
+{
+    Unspecified = 0,
+    Equals = 1,
+    NotEquals = 2,
+    KeyAbsent = 3,
+    StartsWith = 4
+}

src/FrostFS.SDK.ModelsV2/Object.cs

@@ -14,6 +14,41 @@ public class ObjectAttribute
     }
 }
 
+public class ObjectFilter
+{
+    private const string HeaderPrefix = "$Object:"; 
+    public ObjectMatchType MatchType { get; set; }
+    public string Key { get; set; }
+    public string Value { get; set; }
+
+    public ObjectFilter(ObjectMatchType matchType, string key, string value)
+    {
+        MatchType = matchType;
+        Key = key;
+        Value = value;
+    }
+
+    public static ObjectFilter ObjectIdFilter(ObjectMatchType matchType, ObjectId objectId)
+    {
+        return new ObjectFilter(matchType, HeaderPrefix + "objectID", objectId.Value);
+    }
+    
+    public static ObjectFilter OwnerFilter(ObjectMatchType matchType, OwnerId ownerId)
+    {
+        return new ObjectFilter(matchType, HeaderPrefix + "ownerID", ownerId.Value);
+    }
+    
+    public static ObjectFilter RootFilter()
+    {
+        return new ObjectFilter(ObjectMatchType.Unspecified, HeaderPrefix + "ROOT", "");
+    }
+    
+    public static ObjectFilter VersionFilter(ObjectMatchType matchType, Version version)
+    {
+        return new ObjectFilter(matchType, HeaderPrefix + "version", version.ToString());
+    }
+}
+
 public class ObjectHeader
 {
     public ObjectAttribute[] Attributes { get; set; }