feat: create chat message

src/AnthropicClient/Models/ImageSource.cs

@@ -0,0 +1,50 @@
+using System.Text.Json.Serialization;
+
+using AnthropicClient.Utils;
+
+namespace AnthropicClient.Models;
+
+/// <summary>
+/// Represents an image source.
+/// </summary>
+public class ImageSource
+{
+  /// <summary>
+  /// Gets the media type of the image.
+  /// </summary>
+  [JsonPropertyName("media_type")]
+  public string MediaType { get; init; } = string.Empty;
+
+  /// <summary>
+  /// Gets the data of the image.
+  /// </summary>
+  public string Data { get; init; } = string.Empty;
+
+  [JsonConstructor]
+  internal ImageSource()
+  {
+  }
+
+  /// <summary>
+  /// Initializes a new instance of the <see cref="ImageSource"/> class.
+  /// </summary>
+  /// <param name="mediaType">The media type of the image.</param>
+  /// <param name="data">The data of the image.</param>
+  /// <exception cref="ArgumentException">Thrown when the media type is invalid.</exception>
+  /// <exception cref="ArgumentNullException">Thrown when the media type or data is null.</exception>
+  /// <returns>A new instance of the <see cref="ImageSource"/> class.</returns>
+  public ImageSource(string mediaType, string data)
+  {
+    ArgumentValidator.ThrowIfNull(mediaType, nameof(mediaType));
+
+    if (ImageType.IsValidImageType(mediaType) is false)
+    {
+      throw new ArgumentException($"Invalid media type: {mediaType}");
+    }
+
+    ArgumentValidator.ThrowIfNull(data, nameof(data));
+
+    MediaType = mediaType;
+    Data = data;
+  }
+}