feat: migrate HTTP layer from Newtonsoft.Json to System.Text.Json

Replace all Newtonsoft usage across the HTTP abstraction layer as part of the
STJ migration. Renames OpenJObjectResponse() to OpenJsonObjectResponse() returning
System.Text.Json.Nodes.JsonObject, swaps JsonSerializer (Newtonsoft) for
JsonSerializerOptions throughout the request/response pipeline, and replaces
JsonConvert.SerializeObject with JsonSerializer.Serialize for query param building.

Files changed:
- CMA/Http/IResponse.cs
- CMA/Http/ContentstackResponse.cs
- CMA/HTTPRequestHandler.cs
- CMA/Http/ContentstackHttpRequest.cs

Author: OMpawar-21

contentstack.model.generator/CMA/HTTPRequestHandler.cs

@@ -1,5 +1,5 @@
-using Newtonsoft.Json;
-using System;
+using System;
+using System.Text.Json;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -14,12 +14,10 @@ namespace contentstack.CMA
     internal class HttpRequestHandler
     {
         private readonly HttpClient _httpClient;
-        private readonly JsonSerializer _serializer;
 
         public HttpRequestHandler()
         {
             _httpClient = new HttpClient();
-            _serializer = new JsonSerializer();
         }
 
         public async Task<string> ProcessRequest(string Url, Dictionary<string, object> Headers, Dictionary<string, object> BodyJson, string FileName = null) 
@@ -37,7 +35,7 @@ public async Task<string> ProcessRequest(string Url, Dictionary<string, object>
                     return value;
                 }
                 else if (kvp.Value is Dictionary<string, object>)
-                    value = JsonConvert.SerializeObject(kvp.Value);
+                    value = JsonSerializer.Serialize(kvp.Value);
                 else
                     return String.Format("{0}={1}", kvp.Key, kvp.Value);
 

contentstack.model.generator/CMA/Http/ContentstackHttpRequest.cs

@@ -5,7 +5,7 @@
 using System.Collections.Generic;
 using System.Net;
 using System.IO;
-using Newtonsoft.Json;
+using System.Text.Json;
 
 namespace contentstack.CMA.Http
 {
@@ -15,7 +15,7 @@ internal class ContentstackHttpRequest : IHttpRequest
         private bool _disposed = false;
         private readonly HttpClient _httpClient;
         private readonly HttpRequestMessage _request;
-        private readonly JsonSerializer _serializer;
+        private readonly JsonSerializerOptions _options;
         #endregion
 
         #region Public
@@ -52,10 +52,10 @@ public HttpRequestMessage Request
         #endregion
 
         #region Constructor
-        internal ContentstackHttpRequest(HttpClient httpClient, JsonSerializer serializer)
+        internal ContentstackHttpRequest(HttpClient httpClient, JsonSerializerOptions options)
         {
             _httpClient = httpClient;
-            _serializer = serializer;
+            _options = options;
             _request = new HttpRequestMessage();
         }
         #endregion
@@ -124,14 +124,14 @@ public async Task<IResponse> GetResponseAsync()
 
                 if (responseMessage.StatusCode >= HttpStatusCode.Ambiguous &&
                     responseMessage.StatusCode < HttpStatusCode.BadRequest)
-                    return new ContentstackResponse(responseMessage, _serializer);
+                    return new ContentstackResponse(responseMessage, _options);
 
                 if (!responseMessage.IsSuccessStatusCode)
                 {
                     throw new HttpRequestException($"HTTP request failed with status code: {responseMessage.StatusCode}");
                 }
 
-                return new ContentstackResponse(responseMessage, _serializer);
+                return new ContentstackResponse(responseMessage, _options);
             }
             catch (HttpRequestException httpException)
             {

contentstack.model.generator/CMA/Http/ContentstackResponse.cs

@@ -4,8 +4,8 @@
 using System.Net;
 using System.Net.Http;
 using System.Net.Http.Headers;
-using Newtonsoft.Json;
-using Newtonsoft.Json.Linq;
+using System.Text.Json;
+using System.Text.Json.Nodes;
 
 namespace contentstack.CMA.Http
 {
@@ -20,7 +20,7 @@ public class ContentstackResponse : IResponse, IDisposable
         Dictionary<string, string> _headers;
         HashSet<string> _headerNamesSet;
         private readonly HttpResponseMessage _response;
-        private readonly JsonSerializer _serializer;
+        private readonly JsonSerializerOptions _options;
 
         #region Public
         /// <summary>
@@ -126,10 +126,10 @@ private void CopyHeaderValues(HttpResponseMessage response)
         }
         #endregion
 
-        internal ContentstackResponse(HttpResponseMessage response, JsonSerializer serializer)
+        internal ContentstackResponse(HttpResponseMessage response, JsonSerializerOptions options)
         {
             _response = response;
-            _serializer = serializer;
+            _options = options;
 
             this.StatusCode = response.StatusCode;
             this.IsSuccessStatusCode = response.IsSuccessStatusCode;
@@ -146,11 +146,11 @@ internal ContentstackResponse(HttpResponseMessage response, JsonSerializer seria
         /// <summary>
         /// Json Object format response.
         /// </summary>
-        /// <returns>The JObject.</returns>
-        public JObject OpenJObjectResponse()
+        /// <returns>The JsonObject.</returns>
+        public JsonObject OpenJsonObjectResponse()
         {
             ThrowIfDisposed();
-            return JObject.Parse(OpenResponse());
+            return JsonNode.Parse(OpenResponse())!.AsObject();
         }
 
         /// <summary>
@@ -171,8 +171,8 @@ public string OpenResponse()
         public TResponse OpenTResponse<TResponse>()
         {
             ThrowIfDisposed();
-            JObject jObject = OpenJObjectResponse();
-            return jObject.ToObject<TResponse>(_serializer);
+            JsonObject jObject = OpenJsonObjectResponse();
+            return JsonSerializer.Deserialize<TResponse>(jObject.ToJsonString(), _options)!;
         }
 
 

contentstack.model.generator/CMA/Http/IResponse.cs

@@ -1,6 +1,6 @@
 using System;
 using System.Net;
-using Newtonsoft.Json.Linq;
+using System.Text.Json.Nodes;
 
 namespace contentstack.CMA.Http
 {
@@ -19,7 +19,7 @@ public interface IResponse
 
         string OpenResponse();
 
-        JObject OpenJObjectResponse();
+        JsonObject OpenJsonObjectResponse();
 
         TResponse OpenTResponse<TResponse>();
     }