ContentMatch.cs

using System.Text;
using System.Threading.Tasks;
using System.Xml;
using Waher.Networking.HTTP.Interfaces;
using Waher.Runtime.IO;
 
namespace Waher.Security.WAF.Model.Conditions
{
    public class ContentMatch : WafCondition
    {
        public ContentMatch()
            : base()
        {
        }
 
        public ContentMatch(XmlElement Xml, WafAction Parent, WebApplicationFirewall Document)
            : base(Xml, Parent, Document)
        {
        }
 
        public override string LocalName => nameof(ContentMatch);
 
        public override WafAction Create(XmlElement Xml, WafAction Parent, WebApplicationFirewall Document) => new ContentMatch(Xml, Parent, Document);
 
        public override async Task<WafResult?> Review(ProcessingState State)
        {
            if (!State.Request.HasData)
                return null;
 
            if (State.ContentAsString is null)
            {
                long Pos = State.Request.DataStream.Position;
                byte[] Bin = await State.Request.DataStream.ReadAllAsync();
                State.Request.DataStream.Position = Pos;
 
                Encoding Encoding = State.Request.Header.ContentType?.Encoding ?? Encoding.UTF8;
                State.ContentAsString = Encoding.GetString(Bin);
            }
            
            return await this.Review(State, State.ContentAsString);
        }
    }
}