btcpayserver/BTCPayServer/Data/WalletTransactionDataExtensions.cs

using System;
using System.Collections.Generic;
using System.Linq;
using BTCPayServer.Client.Models;
using BTCPayServer.Services.Labels;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json.Serialization;

namespace BTCPayServer.Data
{
    public class WalletTransactionInfo
    {
        public string Comment { get; set; } = string.Empty;
        [JsonIgnore]
        public Dictionary<string, LabelData> Labels { get; set; } = new Dictionary<string, LabelData>();
    }
    public static class WalletTransactionDataExtensions
    {
        public static WalletTransactionInfo GetBlobInfo(this WalletTransactionData walletTransactionData)
        {
            WalletTransactionInfo blobInfo;
            if (walletTransactionData.Blob == null || walletTransactionData.Blob.Length == 0)
                blobInfo = new WalletTransactionInfo();
            else
                blobInfo = JsonConvert.DeserializeObject<WalletTransactionInfo>(ZipUtils.Unzip(walletTransactionData.Blob));
            if (!string.IsNullOrEmpty(walletTransactionData.Labels))
            {
                if (walletTransactionData.Labels.StartsWith('['))
                {
                    foreach (var jtoken in JArray.Parse(walletTransactionData.Labels))
                    {
                        var l = jtoken.Type == JTokenType.String ? Label.Parse(jtoken.Value<string>())
                                                                : Label.Parse(jtoken.ToString());
                        blobInfo.Labels.TryAdd(l.Text, l);
                    }
                }
                else
                {
                    // Legacy path
                    foreach (var token in walletTransactionData.Labels.Split(',',
                        StringSplitOptions.RemoveEmptyEntries))
                    {
                        var l = Label.Parse(token);
                        blobInfo.Labels.TryAdd(l.Text, l);
                    }
                }
            }
            return blobInfo;
        }
        static JsonSerializerSettings LabelSerializerSettings = new JsonSerializerSettings()
        { 
            ContractResolver = new CamelCasePropertyNamesContractResolver(),
            Formatting = Formatting.None
        };
        public static void SetBlobInfo(this WalletTransactionData walletTransactionData, WalletTransactionInfo blobInfo)
        {
            if (blobInfo == null)
            {
                walletTransactionData.Labels = string.Empty;
                walletTransactionData.Blob = Array.Empty<byte>();
                return;
            }
            walletTransactionData.Labels = new JArray(
                blobInfo.Labels.Select(l => JsonConvert.SerializeObject(l.Value, LabelSerializerSettings))
                .Select(l => JObject.Parse(l))
                .OfType<JToken>()
                .ToArray()).ToString();
            walletTransactionData.Blob = ZipUtils.Zip(JsonConvert.SerializeObject(blobInfo));
        }
    }
}