fea: use int for ttl

src/Sinch/Conversation/Messages/Send/SendMessageRequest.cs

@@ -1,7 +1,10 @@
 using System;
 using System.Collections.Generic;
+using System.Linq;
 using System.Text;
+using System.Text.Json;
 using System.Text.Json.Nodes;
+using System.Text.Json.Serialization;
 using Sinch.Conversation.Common;
 using Sinch.Conversation.Messages.Message;
 
@@ -118,11 +121,11 @@ public sealed class SendMessageRequest
         ///     The timeout allotted for sending the message, expressed in seconds.
         ///     Passed to channels which support it and emulated by the Conversation API for channels without ttl
         ///     support but with message retract/unsend functionality. Channel failover will not be performed for
-        ///     messages with an expired TTL. The format is an integer with the suffix `s` (for seconds).
-        ///     Valid integer range is 3 to 315,576,000,000 (inclusive). Example values include `10s`
-        ///     (10 seconds) and `86400s` (24 hours).
+        ///     messages with an expired TTL. 
         /// </summary>
-        public string? Ttl { get; set; }
+        [JsonPropertyName("ttl")]
+        [JsonConverter(typeof(TimeToLiveConverter))]
+        public int? TtlSeconds { get; set; }
 
 
         /// <summary>
@@ -154,11 +157,34 @@ public override string ToString()
             sb.Append("  ConversationMetadata: ").Append(ConversationMetadata).Append("\n");
             sb.Append("  Queue: ").Append(Queue).Append("\n");
             sb.Append("  Recipient: ").Append(Recipient).Append("\n");
-            sb.Append("  Ttl: ").Append(Ttl).Append("\n");
+            sb.Append("  Ttl: ").Append(TtlSeconds).Append("\n");
             sb.Append("  ProcessingStrategy: ").Append(ProcessingStrategy).Append("\n");
             sb.Append("  CorrelationId: ").Append(CorrelationId).Append("\n");
             sb.Append("}\n");
             return sb.ToString();
         }
     }
+
+    public class TimeToLiveConverter : JsonConverter<int?>
+    {
+        public override int? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            var str = reader.GetString();
+            if (str is null) return null;
+            str = str.Trim();
+            var val = str.TakeWhile(x => x == 's').ToString();
+            if (int.TryParse(val, out int result))
+            {
+                return result;
+            }
+
+            return null;
+        }
+
+        public override void Write(Utf8JsonWriter writer, int? value, JsonSerializerOptions options)
+        {
+            string? result = value.HasValue ? value.Value + "s" : null;
+            JsonSerializer.Serialize(writer, result, options);
+        }
+    }
 }

tests/Sinch.Tests/Conversation/SendMessageTests.cs

@@ -481,7 +481,7 @@ public async Task SendAllParams()
             };
             _baseRequest.CorrelationId = "cor_id";
             _baseRequest.ProcessingStrategy = ProcessingStrategy.DispatchOnly;
-            _baseRequest.Ttl = "1800s";
+            _baseRequest.TtlSeconds = 1800;
             _baseRequest.Queue = MessageQueue.HighPriority;
             _baseRequest.MessageMetadata = "meta";
             _baseRequest.Message.ExplicitChannelOmniMessage =