UserAvatar.cs

using System;
using System.Collections.Generic;
using System.Text;
using System.Xml;
using Waher.Content;
using Waher.Content.Xml;
using Waher.Security;
 
namespace Waher.Networking.XMPP.PEP
{
    public class UserAvatar : PersonalEvent
    {
        private byte[] data = null;
        private string sha1Hash = null;
 
        public UserAvatar()
        {
        }
 
        public override string LocalName => "data";
 
        public override string Namespace => "urn:xmpp:avatar:data";
 
        public override string PayloadXml
        {
            get
            {
                StringBuilder Xml = new StringBuilder();
 
                Xml.Append("<data xmlns='");
                Xml.Append(this.Namespace);
                Xml.Append("'>");
                Xml.Append(Convert.ToBase64String(this.data));
                Xml.Append("</data>");
 
                return Xml.ToString();
            }
        }
 
        public override string ItemId
        {
            get
            {
                if (this.sha1Hash is null)
                    this.sha1Hash = Hashes.ComputeSHA1HashString(this.data);
 
                return this.sha1Hash;
            }
        }
 
        public override IPersonalEvent Parse(XmlElement E)
        {
            UserAvatar Result = new UserAvatar()
            {
                data = Convert.FromBase64String(E.InnerText)
            };
 
            return Result;
        }
 
        public byte[] Data
        {
            get => this.data;
            set
            {
                this.data = value;
                this.sha1Hash = null;
            }
        }
 
    }
}