feat: Implement Pack Manifests

src/OrasProject.Oras/Exceptions/InvalidDateTimeFormatException.cs

@@ -0,0 +1,36 @@
+// Copyright The ORAS Authors.
+// 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;
+
+namespace OrasProject.Oras.Exceptions;
+
+/// <summary>
+/// InvalidDateTimeFormatException is thrown when a time format is invalid.
+/// </summary>
+public class InvalidDateTimeFormatException : FormatException
+{
+    public InvalidDateTimeFormatException()
+    {
+    }
+
+    public InvalidDateTimeFormatException(string? message)
+        : base(message)
+    {
+    }
+
+    public InvalidDateTimeFormatException(string? message, Exception? inner)
+        : base(message, inner)
+    {
+    }
+}

src/OrasProject.Oras/Exceptions/InvalidMediaTypeException.cs

@@ -0,0 +1,36 @@
+// Copyright The ORAS Authors.
+// 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;
+
+namespace OrasProject.Oras.Exceptions;
+
+/// <summary>
+/// InvalidMediaTypeException is thrown when media type is invalid.
+/// </summary>
+public class InvalidMediaTypeException : FormatException
+{
+    public InvalidMediaTypeException()
+    {
+    }
+
+    public InvalidMediaTypeException(string? message)
+        : base(message)
+    {
+    }
+
+    public InvalidMediaTypeException(string? message, Exception? inner)
+        : base(message, inner)
+    {
+    }
+}

src/OrasProject.Oras/Exceptions/InvalidPackException.cs

@@ -0,0 +1,36 @@
+// Copyright The ORAS Authors.
+// 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;
+
+namespace OrasProject.Oras.Exceptions;
+
+/// <summary>
+/// InvalidPackException is thrown when an exception is thrown when pack manifest.
+/// </summary>
+public class InvalidPackException : FormatException
+{
+    public InvalidPackException()
+    {
+    }
+
+    public InvalidPackException(string? message)
+        : base(message)
+    {
+    }
+
+    public InvalidPackException(string? message, Exception? inner)
+        : base(message, inner)
+    {
+    }
+}

src/OrasProject.Oras/Exceptions/MissingArtifactTypeException.cs

@@ -0,0 +1,36 @@
+// Copyright The ORAS Authors.
+// 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;
+
+namespace OrasProject.Oras.Exceptions;
+
+/// <summary>
+/// MissingArtifactTypeException is thrown when artifactType is not found in manifest.
+/// </summary>
+public class MissingArtifactTypeException : FormatException
+{
+    public MissingArtifactTypeException()
+    {
+    }
+
+    public MissingArtifactTypeException(string? message)
+        : base(message)
+    {
+    }
+
+    public MissingArtifactTypeException(string? message, Exception? inner)
+        : base(message, inner)
+    {
+    }
+}

src/OrasProject.Oras/Oci/Descriptor.cs

@@ -12,12 +12,22 @@
 // limitations under the License.
 
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
+using System.Text;
 using System.Text.Json.Serialization;
 
 namespace OrasProject.Oras.Oci;
 
 public class Descriptor
 {
+    public Descriptor()
+    {
+    }
+
+    [SetsRequiredMembers]
+    public Descriptor(string mediaType, string digest) =>
+        (MediaType, Digest) = (mediaType, digest);
+
     [JsonPropertyName("mediaType")]
     public required string MediaType { get; set; }
 
@@ -47,5 +57,13 @@ public class Descriptor
     [JsonIgnore(Condition = JsonIgnoreCondition.WhenWritingDefault)]
     public string? ArtifactType { get; set; }
 
+    public static Descriptor Empty => new Descriptor
+    {
+        MediaType = OrasProject.Oras.Oci.MediaType.EmptyJson,
+        Digest = "sha256:44136fa355b3678a1146ad16f7e8649e94fb4fc21fe77e8310c060f61caaff8a",
+        Size = 2,
+        Data = Encoding.UTF8.GetBytes("{}")
+    };
+
     internal BasicDescriptor BasicDescriptor => new BasicDescriptor(MediaType, Digest, Size);
 }