CustomContent.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Threading.Tasks;
using Waher.Content.Binary;
using Waher.Runtime.IO;
 
namespace Waher.Networking.HTTP.Mcp.Model.ContentBlocks
{
    public class CustomContent : ContentBlock 
    {
        public CustomContent()
            : base()
        {
        }
 
        public CustomContent(McpRole[]? Audience, double? Priority, DateTime? LastModified,
            Dictionary<string, object>? MetaData)
            : base(Audience, Priority, LastModified, MetaData)
        {
        }
 
        public override Type[] Encodes => new Type[] 
        { 
            typeof(CustomEncoding)
        };
 
        public override bool IsStructuredContent => false;
 
        public override Task<Dictionary<string, object>> Encode(object Content)
        {
            Dictionary<string, object> Result = new Dictionary<string, object>();
            CustomEncoding Encoded = (CustomEncoding)Content;
 
            if (Encoded.ContentType.StartsWith("text/plain", StringComparison.InvariantCultureIgnoreCase))
            {
                Result["type"] = "text";
                Result["text"] = Strings.GetString(Encoded.Encoded, Encoding.UTF8);
            }
            else if (Encoded.ContentType.StartsWith("image/", StringComparison.InvariantCultureIgnoreCase))
            {
                Result["type"] = "image";
                Result["mimeType"] = Encoded.ContentType;
                Result["data"] = Convert.ToBase64String(Encoded.Encoded);
            }
            else if (Encoded.ContentType.StartsWith("audio/", StringComparison.InvariantCultureIgnoreCase))
            {
                Result["type"] = "audio";
                Result["mimeType"] = Encoded.ContentType;
                Result["data"] = Convert.ToBase64String(Encoded.Encoded);
            }
            else
            {
                Result["type"] = "resource";
                Result["resource"] = new Dictionary<string, object>()
                {
                    { "uri", Encoded.Uri?.OriginalString ?? string.Empty },
                    { "mimeType", Encoded.ContentType },
                    { "blob", Convert.ToBase64String(Encoded.Encoded) }
                };
            }
 
            this.Annotate(Result);
 
            return Task.FromResult(Result);
        }
    }
}