Correct JSON

Source/ProofOfConcept/Models/Token.cs

@@ -1,15 +1,13 @@
+using System.Text.Json.Serialization;
+
 namespace ProofOfConcept.Models;
 
 public record Token
 {
-    public string AccessToken { get; init; }
+    public string AccessToken { get; init; } = String.Empty;
-    public DateTimeOffset Expires { get; init; }
+    public DateTimeOffset Expires { get; init; } = DateTimeOffset.Now;
-    public string TokenType { get; init; }
+    public string TokenType { get; init; } = String.Empty;
-    
+
-    public Token(string AccessToken, int ExpiresIn, string TokenType, DateTimeOffset? received = null)
+    //For JSON deserialization
-    {
+    public int ExpiresIn { get => (int)DateTimeOffset.Now.Subtract(Expires).TotalSeconds; init => Expires = DateTimeOffset.Now.AddSeconds(value); }
-        this.AccessToken = AccessToken;
-        this.Expires = received?.AddSeconds(ExpiresIn) ?? DateTimeOffset.Now.AddSeconds(ExpiresIn);
-        this.TokenType = TokenType;
-    }
 }

Source/ProofOfConcept/Program.cs

@@ -1,5 +1,7 @@
+using System.Text.Json;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Caching.Memory;
+using ProofOfConcept.Models;
 using ProofOfConcept.Services;
 using ProofOfConcept.Utilities;
 
@@ -33,6 +35,20 @@ if (app.Environment.IsDevelopment())
 {
     app.MapOpenApi();
     app.MapGet("/GetPartnerAuthenticationToken", ([FromServices] TeslaAuthenticatorService service) => service.GetPartnerAuthenticationTokenAsync());
+    app.MapGet("/PartnerToken", ([FromQueryAttribute] string json, [FromServices] IMemoryCache memoryCache) =>
+    {
+        var serializerOptions = new JsonSerializerOptions
+        {
+            PropertyNameCaseInsensitive = true,
+            PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower
+        };
+
+        Token? token = JsonSerializer.Deserialize<Token>(json, serializerOptions);
+        if (token is not null)
+            memoryCache.Set(Keys.TeslaPartnerToken, token, token.Expires.Subtract(TimeSpan.FromSeconds(5)));
+        
+        return JsonSerializer.Serialize(token, new JsonSerializerOptions() { WriteIndented = true });
+    });
     app.MapGet("/CheckRegisteredApplication", ([FromServices] TeslaAuthenticatorService service) => service.CheckApplicationRegistrationAsync());
     app.MapGet("/RegisterApplication", ([FromServices] TeslaAuthenticatorService service) => service.RegisterApplicationAsync());
 }

Source/ProofOfConcept/Services/TeslaAuthenticatorService.cs

@@ -18,12 +18,20 @@ public class TeslaAuthenticatorService
     const string authEndpointURL = "https://fleet-auth.prd.vn.cloud.tesla.com/oauth2/v3/token";
     const string euBaseURL = "https://fleet-api.prd.eu.vn.cloud.tesla.com";
 
+    private JsonSerializerOptions serializerOptions;
+    
     public TeslaAuthenticatorService(ILogger<TeslaAuthenticatorService> logger, IOptions<TeslaAuthenticatorServiceConfiguration> options, IHttpClientFactory httpClientFactory, IMemoryCache memoryCache)
     {
         this.logger = logger;
         this.httpClientFactory = httpClientFactory;
         this.memoryCache = memoryCache;
         this.configuration = options.Value;
+
+        serializerOptions = new JsonSerializerOptions()
+        {
+            PropertyNameCaseInsensitive = true,
+            PropertyNamingPolicy = JsonNamingPolicy.SnakeCaseLower
+        };
     }
 
     /// Asynchronously retrieves an authentication token from the Tesla partner API.
@@ -39,7 +47,7 @@ public class TeslaAuthenticatorService
 
         // URL to request the token
         const string audience = euBaseURL;
-
+        
         // Prepare the form-urlencoded body
         Dictionary<string, string> formData = new Dictionary<string, string>
         {