Add validate_webhook method

src/spworlds.cs

@@ -1,7 +1,9 @@
-using System.Net.Http.Headers;
+using System.Net.Http.Headers;
 using System.Text.Json;
 using System.Text;
 using System.Text.Json.Nodes;
+using System.Security.Cryptography;
+using System.Runtime.InteropServices;
 
 namespace spworlds;
 
@@ -13,27 +15,48 @@ public class SPWorlds
     {
         client = new HttpClient();
         var BearerToken = $"{id}:{token}";
+        var token = token
         string Base64BearerToken = Convert.ToBase64String(Encoding.UTF8.GetBytes(BearerToken));
 
         client.BaseAddress = new Uri("https://spworlds.ru/api/public/");
         client.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", Base64BearerToken);
     }
 
+    private async Task<bool> ValidateWebhook(string webhook, string body_hash)
+    {
+        // Если я правильно все понял, то вот
+        // Конвертим из string в bytes body_hash
+        byte[] body = Encoding.UTF8.GetBytes(body_hash);
+        // потом конвертим вебхук
+        byte[] webhook = Encoding.UTF8.GetBytes(webhook);
+        // создаем объект с токеном(тоже encoded в bytes) для сопостовления
+        var key = new HMACSHA256(Encoding.UTF8.GetBytes(token));
+        // Переводим в Base64
+        string webhook_64 = Convert.ToBase64String(key.ComputeHash(webhook));
+        return webhook_64.Equals(body);
+        /**
+         * Тот же код, но на Python:
+            hmac_data = hmac.new(token.encode('utf - 8'), webhook.encode('utf - 8'), sha256).digest()
+            base64_data = b64encode(hmac_data)
+            return hmac.compare_digest(base64_data, body_hash.encode('utf-8'))
+        **/
+    }
+
     private async Task<string> SendRequest(string endpoint, Boolean getResult = true, Dictionary<string, object>? body = null)
     {
         string respond;
         string jsonBody;
-        
-        if(body == null)
+
+        if (body == null)
         {
             return respond = client.GetAsync(endpoint).Result.Content.ReadAsStringAsync().Result;
         }
-        else 
+        else
         {
             jsonBody = JsonSerializer.Serialize(body);
             var payload = new StringContent(jsonBody, Encoding.UTF8, "application/json");
 
-            if(getResult)
+            if (getResult)
                 return respond = client.PostAsync(endpoint, payload).Result.Content.ReadAsStringAsync().Result;
             else
                 await client.PostAsync(endpoint, payload);
@@ -42,7 +65,7 @@ public class SPWorlds
         return null;
     }
 
-    public async Task<int> GetBalance() 
+    public async Task<int> GetBalance()
     {
         string respond = await SendRequest("card");
 
@@ -52,7 +75,7 @@ public class SPWorlds
         return (int)balance;
     }
 
-    public async Task CreatTransaction(string receiver, int amount, string comment)
+    public async Task CreateTransaction(string receiver, int amount, string comment)
     {
         var transitionInfo = new Dictionary<string, object>
         {
@@ -82,9 +105,9 @@ public class SPWorlds
             { "data", data }
         };
 
-        var payment = JsonObject.Parse(await SendRequest(endpoint: $"payment",body: paymentInfo));
+        var payment = JsonObject.Parse(await SendRequest(endpoint: $"payment", body: paymentInfo));
         var url = payment["url"];
 
         return (string)url;
     }
-}
+}