Bitnob rate provider (#5705)

* Bitnob rate provider

* Add Bitnob as recommended exchange for NGN

BTCPayServer.Rating/Providers/BitnobRateProvider.cs

@@ -0,0 +1,40 @@
+using System;
+using System.Collections.Generic;
+using System.Net.Http;
+using System.Threading;
+using System.Threading.Tasks;
+using BTCPayServer.Services.Rates;
+using Newtonsoft.Json.Linq;
+
+namespace BTCPayServer.Rating.Providers
+{
+    public class BitnobRateProvider : IRateProvider
+    {
+        private readonly HttpClient _httpClient;
+        public BitnobRateProvider(HttpClient httpClient)
+        {
+            _httpClient = httpClient ?? new HttpClient();
+        }
+        public RateSourceInfo RateSourceInfo => new("bitnob", "Bitnob", "https://api.bitnob.co/api/v1/rates/bitcoin/price");
+
+        public async Task<PairRate[]> GetRatesAsync(CancellationToken cancellationToken)
+        {
+            using var response = await _httpClient.GetAsync("https://api.bitnob.co/api/v1/rates/bitcoin/price", cancellationToken);
+            JObject jobj = await response.Content.ReadAsAsync<JObject>(cancellationToken);
+            var dataObject = jobj["data"] as JObject;
+
+            if (dataObject == null)
+            {
+                return Array.Empty<PairRate>();
+            }
+            var pairRates = new List<PairRate>();
+            foreach (var property in dataObject.Properties())
+            {
+                string[] parts = property.Name.Split('_');
+                decimal value = property.Value.Value<decimal>();
+                pairRates.Add(new PairRate(new CurrencyPair("BTC", parts[1]), new BidAsk(value)));
+            }
+            return pairRates.ToArray();
+        }
+    }
+}

BTCPayServer.Tests/ThirdPartyTests.cs

@@ -191,6 +191,12 @@ namespace BTCPayServer.Tests
                     // Ripio keeps changing their pair, so anything is fine...
                     Assert.NotEmpty(exchangeRates.ByExchange[name]);
                 }
+                else if (name == "bitnob")
+                {
+                    Assert.Contains(exchangeRates.ByExchange[name],
+                        e => e.CurrencyPair == new CurrencyPair("BTC", "NGN") &&
+                             e.BidAsk.Bid > 1.0m); // 1 BTC will always be more than 1 NGN
+                }
                 else if (name == "cryptomarket")
                 {
                     Assert.Contains(exchangeRates.ByExchange[name],

BTCPayServer/Data/StoreBlob.cs

@@ -202,7 +202,8 @@ namespace BTCPayServer.Data
             { "JPY", "bitbank" },
             { "TRY", "btcturk" },
             { "UGX", "yadio"},
-            { "RSD", "bitpay"}
+            { "RSD", "bitpay"},
+            { "NGN", "bitnob"}
         };
 
         public string GetRecommendedExchange() =>

BTCPayServer/Hosting/BTCPayServerServices.cs

@@ -551,6 +551,7 @@ namespace BTCPayServer.Hosting
             services.AddRateProvider<ByllsRateProvider>();
             services.AddRateProvider<BudaRateProvider>();
             services.AddRateProvider<BitbankRateProvider>();
+            services.AddRateProvider<BitnobRateProvider>();
             services.AddRateProvider<BitpayRateProvider>();
             services.AddRateProvider<RipioExchangeProvider>();
             services.AddRateProvider<CryptoMarketExchangeRateProvider>();