Parse unix time values from the JSON

Author: akacdev

Certstream/JsonConverters.cs

@@ -0,0 +1,29 @@
+using System;
+using System.Text.Json.Serialization;
+using System.Text.Json;
+
+namespace Certstream
+{
+    public class UnixDateTimeOffsetConverter : JsonConverter<DateTimeOffset>
+    {
+        public override DateTimeOffset Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        {
+            if (reader.TokenType == JsonTokenType.Number)
+            {
+                if (reader.TryGetInt64(out long longTime))
+                    return DateTimeOffset.FromUnixTimeSeconds(longTime);
+
+                if (reader.TryGetDouble(out double doubleTime))
+                    return DateTimeOffset.FromUnixTimeSeconds((long)doubleTime);
+            }
+
+            throw new JsonException("Expected a number representing Unix time.");
+        }
+
+        public override void Write(Utf8JsonWriter writer, DateTimeOffset value, JsonSerializerOptions options)
+        {
+            long unixTime = (long)value.ToUnixTimeSeconds();
+            writer.WriteNumberValue(unixTime);
+        }
+    }
+}

Certstream/Models/LeafCertificate.cs

@@ -1,4 +1,5 @@
-using System.Text.Json.Serialization;
+using System;
+using System.Text.Json.Serialization;
 
 namespace Certstream.Models
 {
@@ -16,11 +17,13 @@ public struct LeafCertificate
         [JsonPropertyName("issuer")]
         public Issuer Issuer { get; set; }
 
+        [JsonConverter(typeof(UnixDateTimeOffsetConverter))]
         [JsonPropertyName("not_after")]
-        public int NotAfter { get; set; }
+        public DateTimeOffset NotAfter { get; set; }
 
+        [JsonConverter(typeof(UnixDateTimeOffsetConverter))]
         [JsonPropertyName("not_before")]
-        public int NotBefore { get; set; }
+        public DateTimeOffset NotBefore { get; set; }
 
         [JsonPropertyName("serial_number")]
         public string SerialNumber { get; set; }

Certstream/Models/MessageData.cs

@@ -1,4 +1,5 @@
-using System.Text.Json.Serialization;
+using System;
+using System.Text.Json.Serialization;
 
 namespace Certstream.Models
 {
@@ -13,8 +14,9 @@ public struct MessageData
         [JsonPropertyName("leaf_cert")]
         public LeafCertificate Leaf { get; set; }
 
+        [JsonConverter(typeof(UnixDateTimeOffsetConverter))]
         [JsonPropertyName("seen")]
-        public double Seen { get; set; }
+        public DateTimeOffset Seen { get; set; }
 
         [JsonPropertyName("source")]
         public Source Source { get; set; }