(feature): improve logging and result messages

src/LetsEncrypt/Services/LetsEncryptService.cs

@@ -13,7 +13,6 @@ using MaksIT.LetsEncrypt.Models.Interfaces;
 using MaksIT.LetsEncrypt.Models.Requests;
 using MaksIT.LetsEncrypt.Models.Responses;
 using MaksIT.Results;
-using Microsoft.AspNetCore.Mvc;
 using Microsoft.Extensions.Caching.Memory;
 using Microsoft.Extensions.Logging;
 using System.Net.Http.Headers;
@@ -68,33 +67,51 @@ public class LetsEncryptService : ILetsEncryptService {
   // Helper: Send ACME request and process response
   private async Task<SendResult<T>> SendAcmeRequest<T>(HttpRequestMessage request, State state, HttpMethod method) {
     var response = await _httpClient.SendAsync(request);
+
     UpdateStateNonceIfNeeded(response, state, method);
+
     var responseText = await response.Content.ReadAsStringAsync();
+
     HandleProblemResponseAsync(response, responseText);
+
     return ProcessResponseContent<T>(response, responseText);
   }
 
   // Helper: Poll challenge status until valid or timeout
   private async Task<Result> PollChallengeStatus(Guid sessionId, AuthorizationChallengeChallenge challenge, State state) {
-    if (challenge?.Url == null) return Result.InternalServerError("Challenge URL is null");
+    if (challenge?.Url == null)
+      return Result.InternalServerError("Challenge URL is null");
+
     var start = DateTime.UtcNow;
+
     while (true) {
       var pollRequest = new HttpRequestMessage(HttpMethod.Post, challenge.Url);
+
       await HandleNonceAsync(sessionId, challenge.Url, state);
+
       var pollJson = EncodeMessage(true, null, state, new JwsHeader {
         Url = challenge.Url,
         Nonce = state.Nonce
       });
+
       PrepareRequestContent(pollRequest, pollJson, HttpMethod.Post);
+
       var pollResponse = await _httpClient.SendAsync(pollRequest);
+
       UpdateStateNonceIfNeeded(pollResponse, state, HttpMethod.Post);
+
       var pollResponseText = await pollResponse.Content.ReadAsStringAsync();
+
       HandleProblemResponseAsync(pollResponse, pollResponseText);
+
       var authChallenge = ProcessResponseContent<AuthorizationChallengeResponse>(pollResponse, pollResponseText);
+
       if (authChallenge.Result?.Status != "pending")
         return authChallenge.Result?.Status == "valid" ? Result.Ok() : Result.InternalServerError();
+
       if ((DateTime.UtcNow - start).Seconds > 120)
         return Result.InternalServerError("Timeout");
+
       await Task.Delay(1000);
     }
   }
@@ -103,16 +120,30 @@ public class LetsEncryptService : ILetsEncryptService {
   public async Task<Result> ConfigureClient(Guid sessionId, bool isStaging) {
     try {
       var state = GetOrCreateState(sessionId);
+
       state.IsStaging = isStaging;
+
       _httpClient.BaseAddress ??= new Uri(isStaging ? _appSettings.Staging : _appSettings.Production);
+
       if (state.Directory == null) {
         var request = new HttpRequestMessage(HttpMethod.Get, new Uri(DirectoryEndpoint, UriKind.Relative));
+
         await HandleNonceAsync(sessionId, new Uri(DirectoryEndpoint, UriKind.Relative), state);
+
         var directory = await SendAcmeRequest<AcmeDirectory>(request, state, HttpMethod.Get);
+
         state.Directory = directory.Result ?? throw new InvalidOperationException("Directory response is null");
       }
-      return Result.Ok();
-    } catch (Exception ex) {
+
+      return Result.Ok("Client configured successfully.");
+    }
+    catch (LetsEncrytException ex) {
+      List<string> messages = ["Let's Encrypt client encountered a problem"];
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result.InternalServerError([.. messages]);
+    }
+    catch (Exception ex) {
       const string message = "Let's Encrypt client unhandled exception";
       _logger.LogError(ex, message);
       return Result.InternalServerError(message);
@@ -123,45 +154,68 @@ public class LetsEncryptService : ILetsEncryptService {
   #region Init
   public async Task<Result> Init(Guid sessionId, Guid accountId, string description, string[] contacts, RegistrationCache? cache) {
     if (sessionId == Guid.Empty) {
-      _logger.LogError("Invalid sessionId");
-      return Result.InternalServerError();
+      const string message = "Invalid sessionId";
+      _logger.LogError(message);
+      return Result.InternalServerError(message);
     }
+
     if (contacts == null || contacts.Length == 0) {
-      _logger.LogError("Contacts are null or empty");
-      return Result.InternalServerError();
+      const string message = "Contacts are null or empty";
+      _logger.LogError(message);
+      return Result.InternalServerError(message);
     }
+
     var state = GetOrCreateState(sessionId);
+
     if (state.Directory == null) {
-      _logger.LogError("State directory is null");
-      return Result.InternalServerError();
+      const string message = "State directory is null";
+      _logger.LogError(message);
+      return Result.InternalServerError(message);
     }
+
     _logger.LogInformation($"Executing {nameof(Init)}...");
+
     try {
       var accountKey = new RSACryptoServiceProvider(4096);
+
       if (cache != null && cache.AccountKey != null) {
         state.Cache = cache;
+        
         accountKey.ImportCspBlob(cache.AccountKey);
+        
         state.JwsService = new JwsService(accountKey);
+        
         state.JwsService.SetKeyId(cache.Location?.ToString() ?? string.Empty);
-      } else {
+      }
+      else {
         state.JwsService = new JwsService(accountKey);
+
         var letsEncryptOrder = new Account {
           TermsOfServiceAgreed = true,
-          Contacts = contacts.Select(contact => $"mailto:{contact}").ToArray()
+          Contacts = [.. contacts.Select(contact => $"mailto:{contact}")]
         };
+
         var request = new HttpRequestMessage(HttpMethod.Post, state.Directory.NewAccount);
+
         await HandleNonceAsync(sessionId, state.Directory.NewAccount, state);
+
         var json = EncodeMessage(false, letsEncryptOrder, state, new JwsHeader {
           Url = state.Directory.NewAccount,
           Nonce = state.Nonce
         });
+
         PrepareRequestContent(request, json, HttpMethod.Post);
+
         var result = await SendAcmeRequest<Account>(request, state, HttpMethod.Post);
+
         state.JwsService.SetKeyId(result.Result?.Location?.ToString() ?? string.Empty);
+
         if (result.Result?.Status != "valid") {
-          _logger.LogError($"Account status is not valid, was: {result.Result?.Status} \r\n {result.ResponseText}");
-          return Result.InternalServerError();
+          var errorMessage = $"Account status is not valid, was: {result.Result?.Status} \r\n {result.ResponseText}";
+          _logger.LogError(errorMessage);
+          return Result.InternalServerError(errorMessage);
         }
+
         state.Cache = new RegistrationCache {
           AccountId = accountId,
           Description = description,
@@ -173,8 +227,16 @@ public class LetsEncryptService : ILetsEncryptService {
           Key = result.Result.Key
         };
       }
-      return Result.Ok();
-    } catch (Exception ex) {
+
+      return Result.Ok("Initialization successful.");
+    }
+    catch (LetsEncrytException ex) {
+      List<string> messages = ["Let's Encrypt client encountered a problem"];
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result.InternalServerError([.. messages]);
+    }
+    catch (Exception ex) {
       const string message = "Let's Encrypt client unhandled exception";
       _logger.LogError(ex, message);
       return Result.InternalServerError(message);
@@ -184,8 +246,10 @@ public class LetsEncryptService : ILetsEncryptService {
 
   public Result<RegistrationCache?> GetRegistrationCache(Guid sessionId) {
     var state = GetOrCreateState(sessionId);
+
     if(state?.Cache == null)
       return Result<RegistrationCache?>.InternalServerError(null);
+
     return Result<RegistrationCache?>.Ok(state.Cache);
   }
 
@@ -193,15 +257,20 @@ public class LetsEncryptService : ILetsEncryptService {
   public Result<string?> GetTermsOfServiceUri(Guid sessionId) {
     try {
       var state = GetOrCreateState(sessionId);
+
       _logger.LogInformation($"Executing {nameof(GetTermsOfServiceUri)}...");
+
       if (state.Directory?.Meta?.TermsOfService == null) {
         return Result<string?>.Ok(null);
       }
+
       return Result<string?>.Ok(state.Directory.Meta.TermsOfService);
-    } catch (Exception ex) {
-      var message = "Let's Encrypt client unhandled exception";
-      _logger.LogError(ex, message);
-      return Result<string?>.InternalServerError(message);
+    }
+    catch (Exception ex) {
+      List<string> messages = new List<string> { "Let's Encrypt client unhandled exception" };
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result<string?>.InternalServerError(null, [.. messages]);
     }
   }
   #endregion
@@ -210,61 +279,96 @@ public class LetsEncryptService : ILetsEncryptService {
   public async Task<Result<Dictionary<string, string>?>> NewOrder(Guid sessionId, string[] hostnames, string challengeType) {
     try {
       var state = GetOrCreateState(sessionId);
+
       _logger.LogInformation($"Executing {nameof(NewOrder)}...");
+
       state.Challenges.Clear();
+
       var letsEncryptOrder = new Order {
         Expires = DateTime.UtcNow.AddDays(2),
         Identifiers = hostnames?.Where(h => h != null).Select(hostname => new OrderIdentifier {
           Type = DnsType,
           Value = hostname ?? string.Empty
-        }).ToArray() ?? Array.Empty<OrderIdentifier>()
+        }).ToArray() ?? []
       };
+
       if (state.Directory == null || state.Directory.NewOrder == null)
         return Result<Dictionary<string, string>?>.InternalServerError(null);
+
       var request = new HttpRequestMessage(HttpMethod.Post, state.Directory.NewOrder);
+
       await HandleNonceAsync(sessionId, state.Directory.NewOrder, state);
+
       var json = EncodeMessage(false, letsEncryptOrder, state, new JwsHeader {
         Url = state.Directory.NewOrder,
         Nonce = state.Nonce
       });
+
       PrepareRequestContent(request, json, HttpMethod.Post);
+
       var order = await SendAcmeRequest<Order>(request, state, HttpMethod.Post);
+
       if (StatusEquals(order.Result?.Status, OrderStatus.Ready))
         return Result<Dictionary<string, string>?>.Ok(new Dictionary<string, string>());
+
       if (!StatusEquals(order.Result?.Status, OrderStatus.Pending)) {
         _logger.LogError($"Created new order and expected status '{OrderStatus.Pending.GetDisplayName()}', but got: {order.Result?.Status} \r\n {order.Result}");
         return Result<Dictionary<string, string>?>.InternalServerError(null);
       }
+
       state.CurrentOrder = order.Result;
+
       var results = new Dictionary<string, string>();
+
       foreach (var item in state.CurrentOrder?.Authorizations ?? Array.Empty<Uri>()) {
-        if (item == null) continue;
+        if (item == null)
+          continue;
+
         request = new HttpRequestMessage(HttpMethod.Post, item);
+
         await HandleNonceAsync(sessionId, item, state);
+
         json = EncodeMessage(true, null, state, new JwsHeader {
           Url = item,
           Nonce = state.Nonce
         });
+
         PrepareRequestContent(request, json, HttpMethod.Post);
+
         var challengeResponse = await SendAcmeRequest<AuthorizationChallengeResponse>(request, state, HttpMethod.Post);
+
         if (StatusEquals(challengeResponse.Result?.Status, OrderStatus.Valid))
           continue;
+
         if (!StatusEquals(challengeResponse.Result?.Status, OrderStatus.Pending)) {
           _logger.LogError($"Expected authorization status '{OrderStatus.Pending.GetDisplayName()}', but got: {state.CurrentOrder?.Status} \r\n {challengeResponse.ResponseText}");
           return Result<Dictionary<string, string>?>.InternalServerError(null);
         }
-        var challenge = challengeResponse.Result?.Challenges?.FirstOrDefault(x => x?.Type == challengeType);
+
+        var challenge = challengeResponse.Result?.Challenges?
+          .FirstOrDefault(x => x?.Type == challengeType);
+
         if (challenge == null || challenge.Token == null) {
           _logger.LogError("Challenge or token is null");
           return Result<Dictionary<string, string>?>.InternalServerError(null);
         }
+
         state.Challenges.Add(challenge);
-        if (state.Cache != null) state.Cache.ChallengeType = challengeType;
-        var keyToken = state.JwsService != null ? state.JwsService.GetKeyAuthorization(challenge.Token) : string.Empty;
+        
+        if (state.Cache != null)
+          state.Cache.ChallengeType = challengeType;
+
+        var keyToken = state.JwsService != null
+          ? state.JwsService.GetKeyAuthorization(challenge.Token)
+          : string.Empty;
+        
         switch (challengeType) {
           case "dns-01":
             using (var sha256 = SHA256.Create()) {
-              var dnsToken = state.JwsService != null ? state.JwsService.Base64UrlEncoded(sha256.ComputeHash(Encoding.UTF8.GetBytes(keyToken ?? string.Empty))) : string.Empty;
+              var dnsToken = state.JwsService != null
+                ? state.JwsService.Base64UrlEncoded(sha256.ComputeHash(Encoding.UTF8.GetBytes(keyToken ?? string.Empty)))
+                : string.Empty;
+
               results[challengeResponse.Result?.Identifier?.Value ?? string.Empty] = dnsToken;
             }
             break;
@@ -277,10 +381,12 @@ public class LetsEncryptService : ILetsEncryptService {
       }
 
       return Result<Dictionary<string, string>?>.Ok(results);
-    } catch (Exception ex) {
-      var message = "Let's Encrypt client unhandled exception";
-      _logger.LogError(ex, message);
-      return Result<Dictionary<string, string>?>.InternalServerError(null, message);
+    }
+    catch (Exception ex) {
+      List<string> messages = new List<string> { "Let's Encrypt client unhandled exception" };
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result<Dictionary<string, string>?>.InternalServerError(null, [.. messages]);
     }
   }
   #endregion
@@ -289,33 +395,46 @@ public class LetsEncryptService : ILetsEncryptService {
   public async Task<Result> CompleteChallenges(Guid sessionId) {
     try {
       var state = GetOrCreateState(sessionId);
+
       _logger.LogInformation($"Executing {nameof(CompleteChallenges)}...");
+
       if (state.CurrentOrder?.Identifiers == null) {
         return Result.InternalServerError("Current order identifiers are null");
       }
+
       for (var index = 0; index < state.Challenges.Count; index++) {
         var challenge = state.Challenges[index];
+
         if (challenge?.Url == null) {
           _logger.LogError("Challenge URL is null");
           return Result.InternalServerError();
         }
+
         var request = new HttpRequestMessage(HttpMethod.Post, challenge.Url);
+
         await HandleNonceAsync(sessionId, challenge.Url, state);
+
         var json = EncodeMessage(false, "{}", state, new JwsHeader {
           Url = challenge.Url,
           Nonce = state.Nonce
         });
+
         PrepareRequestContent(request, json, HttpMethod.Post);
+
         var authChallenge = await SendAcmeRequest<AuthorizationChallengeResponse>(request, state, HttpMethod.Post);
+
         var result = await PollChallengeStatus(sessionId, challenge, state);
+
         if (!result.IsSuccess)
           return result;
       }
       return Result.Ok();
-    } catch (Exception ex) {
-      var message = "Let's Encrypt client unhandled exception";
-      _logger.LogError(ex, message);
-      return Result.InternalServerError(message);
+    }
+    catch (Exception ex) {
+      List<string> messages = new List<string> { "Let's Encrypt client unhandled exception" };
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result.InternalServerError([.. messages]);
     }
   }
   #endregion
@@ -324,28 +443,39 @@ public class LetsEncryptService : ILetsEncryptService {
   public async Task<Result> GetOrder(Guid sessionId, string[] hostnames) {
     try {
       _logger.LogInformation($"Executing {nameof(GetOrder)}");
+
       var state = GetOrCreateState(sessionId);
+
       var letsEncryptOrder = new Order {
         Expires = DateTime.UtcNow.AddDays(2),
         Identifiers = hostnames?.Where(h => h != null).Select(hostname => new OrderIdentifier {
           Type = "dns",
           Value = hostname!
-        }).ToArray() ?? Array.Empty<OrderIdentifier>()
+        }).ToArray() ?? []
       };
+
       var request = new HttpRequestMessage(HttpMethod.Post, state.Directory!.NewOrder);
+
       await HandleNonceAsync(sessionId, state.Directory.NewOrder, state);
+
       var json = EncodeMessage(false, letsEncryptOrder, state, new JwsHeader {
         Url = state.Directory.NewOrder,
         Nonce = state.Nonce
       });
+
       PrepareRequestContent(request, json, HttpMethod.Post);
+
       var order = await SendAcmeRequest<Order>(request, state, HttpMethod.Post);
+
       state.CurrentOrder = order.Result;
+
       return Result.Ok();
-    } catch (Exception ex) {
-      var message = "Let's Encrypt client unhandled exception";
-      _logger.LogError(ex, message);
-      return Result.InternalServerError(message);
+    }
+    catch (Exception ex) {
+      List<string> messages = new List<string> { "Let's Encrypt client unhandled exception" };
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result.InternalServerError([.. messages]);
     }
   }
   #endregion
@@ -354,85 +484,122 @@ public class LetsEncryptService : ILetsEncryptService {
   public async Task<Result> GetCertificate(Guid sessionId, string subject) {
     try {
       var state = GetOrCreateState(sessionId);
+
       _logger.LogInformation($"Executing {nameof(GetCertificate)}...");
+
       if (state.CurrentOrder?.Identifiers == null) {
         return Result.InternalServerError();
       }
+
       var key = new RSACryptoServiceProvider(4096);
-      var csr = new CertificateRequest("CN=" + subject,
-          key, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
+      var csr = new CertificateRequest("CN=" + subject, key, HashAlgorithmName.SHA256, RSASignaturePadding.Pkcs1);
       var san = new SubjectAlternativeNameBuilder();
+
       foreach (var host in state.CurrentOrder.Identifiers) {
         if (host?.Value != null)
           san.AddDnsName(host.Value);
       }
+
       csr.CertificateExtensions.Add(san.Build());
+
       var letsEncryptOrder = new FinalizeRequest {
         Csr = state.JwsService!.Base64UrlEncoded(csr.CreateSigningRequest())
       };
+
       Uri? certificateUrl = default;
+
       var start = DateTime.UtcNow;
+
       while (certificateUrl == null) {
-        var hostnames = state.CurrentOrder.Identifiers?.Select(x => x?.Value).Where(x => x != null).Cast<string>().ToArray() ?? Array.Empty<string>();
+        var hostnames = state.CurrentOrder?.Identifiers?.Select(x => x?.Value).Where(x => x != null).Cast<string>().ToArray() ?? [];
+
         await GetOrder(sessionId, hostnames);
+
         var status = state.CurrentOrder?.Status;
+
         if (StatusEquals(status, OrderStatus.Ready)) {
-          var request = new HttpRequestMessage(HttpMethod.Post, state.CurrentOrder.Finalize!);
+          var request = new HttpRequestMessage(HttpMethod.Post, state.CurrentOrder.Finalize);
+
           await HandleNonceAsync(sessionId, state.CurrentOrder.Finalize!, state);
+
           var json = EncodeMessage(false, letsEncryptOrder, state, new JwsHeader {
             Url = state.CurrentOrder.Finalize,
             Nonce = state.Nonce
           });
+
           PrepareRequestContent(request, json, HttpMethod.Post);
+
           var order = await SendAcmeRequest<Order>(request, state, HttpMethod.Post);
+
           if (StatusEquals(order.Result?.Status, OrderStatus.Processing)) {
             request = new HttpRequestMessage(HttpMethod.Post, state.CurrentOrder.Location!);
+
             await HandleNonceAsync(sessionId, state.CurrentOrder.Location!, state);
+
             json = EncodeMessage(true, null, state, new JwsHeader {
               Url = state.CurrentOrder.Location,
               Nonce = state.Nonce
             });
+
             PrepareRequestContent(request, json, HttpMethod.Post);
+
             order = await SendAcmeRequest<Order>(request, state, HttpMethod.Post);
           }
+
           if (StatusEquals(order.Result?.Status, OrderStatus.Valid)) {
             certificateUrl = order.Result.Certificate;
           }
-        } else if (StatusEquals(status, OrderStatus.Valid)) {
+        }
+        else if (StatusEquals(status, OrderStatus.Valid)) {
           certificateUrl = state.CurrentOrder.Certificate;
           break;
         }
+
         if ((DateTime.UtcNow - start).Seconds > 120)
           throw new TimeoutException();
+
         await Task.Delay(1000);
       }
+
       var finalRequest = new HttpRequestMessage(HttpMethod.Post, certificateUrl!);
+
       await HandleNonceAsync(sessionId, certificateUrl!, state);
+
       var finalJson = EncodeMessage(true, null, state, new JwsHeader {
         Url = certificateUrl,
         Nonce = state.Nonce
       });
+
       PrepareRequestContent(finalRequest, finalJson, HttpMethod.Post);
+
       var pem = await SendAcmeRequest<string>(finalRequest, state, HttpMethod.Post);
+
       if (state.Cache == null) {
         _logger.LogError($"{nameof(state.Cache)} is null");
         return Result.InternalServerError();
       }
+
       state.Cache.CachedCerts ??= new Dictionary<string, CertificateCache>();
+
       state.Cache.CachedCerts[subject] = new CertificateCache {
         Cert = pem.Result ?? string.Empty,
         Private = key.ExportCspBlob(true),
         PrivatePem = key.ExportRSAPrivateKeyPem()
       };
+
       var certPem = pem.Result ?? string.Empty;
+
       if (!string.IsNullOrEmpty(certPem)) {
         var cert = new X509Certificate2(Encoding.UTF8.GetBytes(certPem));
       }
+
       return Result.Ok();
-    } catch (Exception ex) {
-      var message = "Let's Encrypt client unhandled exception";
-      _logger.LogError(ex, message);
-      return Result.InternalServerError(message);
+    }
+    catch (Exception ex) {
+      List<string> messages = new List<string> { "Let's Encrypt client unhandled exception" };
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result.InternalServerError([.. messages]);
     }
   }
   #endregion
@@ -444,58 +611,86 @@ public class LetsEncryptService : ILetsEncryptService {
   public async Task<Result> RevokeCertificate(Guid sessionId, string subject, RevokeReason reason) {
     try {
       var state = GetOrCreateState(sessionId);
+
       _logger.LogInformation($"Executing {nameof(RevokeCertificate)}...");
+
       if (state.Cache?.CachedCerts == null || !state.Cache.CachedCerts.TryGetValue(subject, out var certificateCache) || certificateCache == null) {
         _logger.LogError("Certificate not found in cache");
         return Result.InternalServerError("Certificate not found");
       }
+
       var certPem = certificateCache.Cert ?? string.Empty;
+
       if (string.IsNullOrEmpty(certPem)) {
         _logger.LogError("Certificate PEM is null or empty");
         return Result.InternalServerError("Certificate PEM is null or empty");
       }
+
       var certificate = new X509Certificate2(Encoding.UTF8.GetBytes(certPem));
+      
       var derEncodedCert = certificate.Export(X509ContentType.Cert);
+      
       var base64UrlEncodedCert = state.JwsService!.Base64UrlEncoded(derEncodedCert);
+      
       var revokeRequest = new RevokeRequest {
         Certificate = base64UrlEncodedCert,
         Reason = (int)reason
       };
+
       var request = new HttpRequestMessage(HttpMethod.Post, state.Directory!.RevokeCert);
+
       await HandleNonceAsync(sessionId, state.Directory.RevokeCert, state);
+
       var jwsHeader = new JwsHeader {
         Url = state.Directory.RevokeCert,
         Nonce = state.Nonce
       };
+
       var json = state.JwsService.Encode(revokeRequest, jwsHeader).ToJson();
+
       request.Content = new StringContent(json);
+
       request.Content.Headers.ContentType = new MediaTypeHeaderValue(GetContentType(ContentType.JoseJson));
+
       var response = await _httpClient.SendAsync(request);
+
       UpdateStateNonceIfNeeded(response, state, HttpMethod.Post);
+
       var responseText = await response.Content.ReadAsStringAsync();
+
       if (response.Content.Headers.ContentType?.MediaType == GetContentType(ContentType.ProblemJson)) {
         var erroObj = responseText.ToObject<Problem>();
       }
+
       if (!response.IsSuccessStatusCode)
         Result.InternalServerError(responseText);
+
       state.Cache.CachedCerts.Remove(subject);
       _logger.LogInformation("Certificate revoked successfully");
+
       return Result.Ok();
-    } catch (Exception ex) {
-      var message = "Let's Encrypt client unhandled exception";
-      _logger.LogError(ex, message);
-      return Result.InternalServerError($"{message}: {ex.Message}");
+
+    }
+    catch (Exception ex) {
+      List<string> messages = new List<string> { "Let's Encrypt client unhandled exception" };
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result.InternalServerError([.. messages]);
     }
   }
 
   #region SendAsync
   private async Task HandleNonceAsync(Guid sessionId, Uri uri, State state) {
-    if (uri == null) throw new ArgumentNullException(nameof(uri));
+    if (uri == null)
+      throw new ArgumentNullException(nameof(uri));
+
     if (uri.OriginalString != "directory") {
       var newNonceResult = await NewNonce(sessionId);
+
       if (!newNonceResult.IsSuccess || newNonceResult.Value == null) {
         throw new InvalidOperationException("Failed to retrieve nonce.");
       }
+
       state.Nonce = newNonceResult.Value;
     }
     else {
@@ -506,17 +701,23 @@ public class LetsEncryptService : ILetsEncryptService {
   private async Task<Result<string?>> NewNonce(Guid sessionId) {
     try {
       var state = GetOrCreateState(sessionId);
+
       _logger.LogInformation($"Executing {nameof(NewNonce)}...");
+
       if (state.Directory?.NewNonce == null)
         return Result<string?>.InternalServerError(null);
+
       var result = await _httpClient.SendAsync(new HttpRequestMessage(HttpMethod.Head, state.Directory.NewNonce));
+
       var nonce = result.Headers.GetValues("Replay-Nonce").FirstOrDefault();
+
       return Result<string?>.Ok(nonce);
     }
     catch (Exception ex) {
-      var message = "Let's Encrypt client unhandled exception";
-      _logger.LogError(ex, message);
-      return Result<string?>.InternalServerError(null, message);
+      List<string> messages = new List<string> { "Let's Encrypt client unhandled exception" };
+      _logger.LogError(ex, messages.FirstOrDefault());
+      messages.Add(ex.Message);
+      return Result<string?>.InternalServerError(null, [.. messages]);
     }
   }
 
@@ -530,13 +731,17 @@ public class LetsEncryptService : ILetsEncryptService {
 
   private void PrepareRequestContent(HttpRequestMessage request, string json, HttpMethod method) {
     request.Content = new StringContent(json ?? string.Empty);
-    var contentType = method == HttpMethod.Post ? GetContentType(ContentType.JoseJson) : GetContentType(ContentType.Json);
+    var contentType = method == HttpMethod.Post
+      ? GetContentType(ContentType.JoseJson)
+      : GetContentType(ContentType.Json);
     request.Content.Headers.ContentType = new MediaTypeHeaderValue(contentType);
   }
 
   private void HandleProblemResponseAsync(HttpResponseMessage response, string responseText) {
     if (response.Content.Headers.ContentType?.MediaType == GetContentType(ContentType.ProblemJson)) {
-      throw new LetsEncrytException(responseText.ToObject<Problem>(), response);
+      var problem = responseText.ToObject<Problem>();
+
+      throw new LetsEncrytException(problem, response);
     }
   }