fix(http-client-wrapper): implement skipping SSL cert verification

.editorconfig

@@ -179,6 +179,9 @@ dotnet_diagnostic.CA1310.severity = none
 # JSON002: Probable JSON string detected
 dotnet_diagnostic.JSON002.severity = none
 
+# S4830: Server certificates should be verified during SSL/TLS connection
+dotnet_diagnostic.S4830.severity = none
+
 [*.vb]
 ###############################
 # VB Coding Conventions       #

APIMatic.Core.Test/Http/CoreHttpClientConfigurationTest.cs

@@ -22,6 +22,7 @@ public void Builder_BuildWithPrameters_CoreHttpClientConfiguration()
         {
             // Arrange
             var timeout = 180;
+            var skipSslCertVerification = true;
             var numberOfRetries = 3;
             var backoffFactor = 3;
             var retryInterval = 4.5;
@@ -32,6 +33,7 @@ public void Builder_BuildWithPrameters_CoreHttpClientConfiguration()
             // Act
             var config = _config.ToBuilder()
                 .Timeout(TimeSpan.FromSeconds(timeout))
+                .SkipSslCertVerification(skipSslCertVerification)
                 .NumberOfRetries(numberOfRetries)
                 .BackoffFactor(backoffFactor)
                 .RetryInterval(retryInterval)
@@ -43,6 +45,7 @@ public void Builder_BuildWithPrameters_CoreHttpClientConfiguration()
             // Assert
             Assert.NotNull(config);
             Assert.AreEqual(config.Timeout, TimeSpan.FromSeconds(timeout));
+            Assert.AreEqual(config.SkipSslCertVerification, skipSslCertVerification);
             Assert.AreEqual(config.NumberOfRetries, numberOfRetries);
             Assert.AreEqual(config.BackoffFactor, backoffFactor);
             Assert.AreEqual(config.RetryInterval, retryInterval);
@@ -60,10 +63,12 @@ public void Builder_BuildWithInvalidPrameters_CoreHttpClientConfiguration()
             var backoffFactor = 0;
             var retryInterval = -1;
             var maximumRetryWaitTime = -1;
+            var skipSslCertVerification = false;
 
             var config = _config.ToBuilder()
                 .HttpClientInstance(null)
                 .Timeout(TimeSpan.FromSeconds(timeout))
+                .SkipSslCertVerification(skipSslCertVerification)
                 .NumberOfRetries(numberOfRetries)
                 .BackoffFactor(backoffFactor)
                 .RetryInterval(retryInterval)
@@ -83,6 +88,7 @@ public void Builder_BuildWithInvalidPrameters_CoreHttpClientConfiguration()
             Assert.NotNull(config);
             Assert.NotNull(config.HttpClientInstance);
             Assert.AreEqual(config.Timeout, TimeSpan.FromSeconds(defaultTimeout));
+            Assert.AreEqual(config.SkipSslCertVerification, skipSslCertVerification);
             Assert.AreEqual(config.NumberOfRetries, defaultNumberOfRetries);
             Assert.AreEqual(config.BackoffFactor, defaultBackoffFactor);
             Assert.AreEqual(config.RetryInterval, defaultRetryInterval);
@@ -98,7 +104,7 @@ public void ToString_Default_CoreHttpClientConfiguration()
             var actual = _config.ToString();
 
             // Assert
-            var expected = "HttpClientConfiguration: 00:01:40 , 0 , 2 , 1 , 00:02:00 , System.Collections.Immutable.ImmutableList`1[System.Int32] , System.Collections.Immutable.ImmutableList`1[System.Net.Http.HttpMethod] , System.Net.Http.HttpClient , True ";
+            var expected = "HttpClientConfiguration: 00:01:40 , False , 0 , 2 , 1 , 00:02:00 , System.Collections.Immutable.ImmutableList`1[System.Int32] , System.Collections.Immutable.ImmutableList`1[System.Net.Http.HttpMethod] , System.Net.Http.HttpClient , True ";
             Assert.AreEqual(expected, actual);
         }
     }

APIMatic.Core.Test/Http/HttpClientWrapperSSLTest.cs

@@ -0,0 +1,71 @@
+using System;
+using System.Collections.Generic;
+using System.Net;
+using System.Net.Http;
+using System.Threading.Tasks;
+using APIMatic.Core.Http.Configuration;
+using NUnit.Framework;
+
+namespace APIMatic.Core.Test.Http
+{
+    [TestFixture]
+    public class HttpClientWrapperSSLTest : TestBase
+    {
+        private readonly string expiredSSLCertUrl = "https://expired.badssl.com/";
+
+        [Test]
+        public void TestHttpClientSSLCertificateVerification_ExceptionResponse()
+        {
+            var expectedValue = "The SSL connection could not be established, see inner exception.";
+            var clientConfiguration = new CoreHttpClientConfiguration.Builder()
+                .Build();
+
+            var config = new GlobalConfiguration.Builder()
+                .ServerUrls(new Dictionary<Enum, string>
+                {
+                    { MockServer.Server1, expiredSSLCertUrl },
+                }, MockServer.Server1)
+                .HttpConfiguration(clientConfiguration)
+                .ApiCallback(ApiCallBack)
+                .Build();
+
+            var client = config.HttpClient;
+
+            var request = config.GlobalRequestBuilder()
+                .Setup(HttpMethod.Get, string.Empty)
+                .Build();
+
+            // Act
+            var ex = Assert.ThrowsAsync<HttpRequestException>(() => client.ExecuteAsync(request));
+            Assert.AreEqual(expectedValue, ex.Message);
+        }
+
+        [Test]
+        public async Task TestHttpClientSkipSSLCertificateVerification_OKResponse()
+        {
+            var clientConfiguration = new CoreHttpClientConfiguration.Builder()
+                .SkipSslCertVerification(true)
+                .Build();
+
+            var config = new GlobalConfiguration.Builder()
+                .ServerUrls(new Dictionary<Enum, string>
+                {
+                    { MockServer.Server1, expiredSSLCertUrl },
+                }, MockServer.Server1)
+                .HttpConfiguration(clientConfiguration)
+                .ApiCallback(ApiCallBack)
+                .Build();
+
+            var client = config.HttpClient;
+
+            var request = config.GlobalRequestBuilder()
+                .Setup(HttpMethod.Get, string.Empty)
+                .Build();
+
+            // Act
+            var actual = await client.ExecuteAsync(request);
+
+            Assert.AreEqual(actual.StatusCode, (int)HttpStatusCode.OK);
+        }
+    }
+}

APIMatic.Core/Http/Configuration/CoreHttpClientConfiguration.cs

@@ -20,6 +20,7 @@ public class CoreHttpClientConfiguration : ICoreHttpClientConfiguration
         /// </summary>
         private CoreHttpClientConfiguration(
             TimeSpan timeout,
+            bool skipSslCertVerification,
             int numberOfRetries,
             int backoffFactor,
             double retryInterval,
@@ -30,6 +31,7 @@ private CoreHttpClientConfiguration(
             bool overrideHttpClientConfiguration)
         {
             Timeout = timeout;
+            SkipSslCertVerification = skipSslCertVerification;
             NumberOfRetries = numberOfRetries;
             BackoffFactor = backoffFactor;
             RetryInterval = retryInterval;
@@ -45,6 +47,11 @@ private CoreHttpClientConfiguration(
         /// </summary>
         public TimeSpan Timeout { get; }
 
+        /// <summary>
+        /// Gets Whether to skip verification of SSL certificates.
+        /// </summary>
+        public bool SkipSslCertVerification { get; }
+
         /// <summary>
         /// Gets Number of times the request is retried.
         /// </summary>
@@ -90,6 +97,7 @@ public override string ToString()
         {
             return "HttpClientConfiguration: " +
                 $"{Timeout} , " +
+                $"{SkipSslCertVerification} , " +
                 $"{NumberOfRetries} , " +
                 $"{BackoffFactor} , " +
                 $"{RetryInterval} , " +
@@ -108,6 +116,7 @@ public Builder ToBuilder()
         {
             var builder = new Builder()
                 .Timeout(Timeout)
+                .SkipSslCertVerification(SkipSslCertVerification)
                 .NumberOfRetries(NumberOfRetries)
                 .BackoffFactor(BackoffFactor)
                 .RetryInterval(RetryInterval)
@@ -125,6 +134,7 @@ public Builder ToBuilder()
         public class Builder
         {
             private TimeSpan timeout = TimeSpan.FromSeconds(100);
+            private bool skipSslCertVerification = false;
             private int numberOfRetries = 0;
             private int backoffFactor = 2;
             private double retryInterval = 1;
@@ -137,7 +147,7 @@ public class Builder
             {
                 "GET", "PUT"
             }.Select(val => new HttpMethod(val)).ToImmutableList();
-            private HttpClient httpClientInstance = new HttpClient();
+            private HttpClient httpClientInstance = null;
             private bool overrideHttpClientConfiguration = true;
 
             /// <summary>
@@ -151,6 +161,17 @@ public Builder Timeout(TimeSpan timeout)
                 return this;
             }
 
+            /// <summary>
+            /// Sets the SkipSslCertVerification.
+            /// </summary>
+            /// <param name="skipSslCertVerification">Bool for skipping (or not) SSL certificate verification</param>
+            /// <returns>Builder.</returns>
+            public Builder SkipSslCertVerification(bool skipSslCertVerification)
+            {
+                this.skipSslCertVerification = skipSslCertVerification;
+                return this;
+            }
+
             /// <summary>
             /// Sets the NumberOfRetries.
             /// </summary>
@@ -225,7 +246,7 @@ public Builder RequestMethodsToRetry(IList<HttpMethod> requestMethodsToRetry)
             /// <returns>Builder.</returns>
             public Builder HttpClientInstance(HttpClient httpClientInstance, bool overrideHttpClientConfiguration = true)
             {
-                this.httpClientInstance = httpClientInstance ?? new HttpClient();
+                this.httpClientInstance = httpClientInstance;
                 this.overrideHttpClientConfiguration = overrideHttpClientConfiguration;
                 return this;
             }
@@ -238,15 +259,41 @@ public CoreHttpClientConfiguration Build()
             {
                 return new CoreHttpClientConfiguration(
                         timeout,
+                        skipSslCertVerification,
                         numberOfRetries,
                         backoffFactor,
                         retryInterval,
                         maximumRetryWaitTime,
                         statusCodesToRetry,
                         requestMethodsToRetry,
-                        httpClientInstance,
+                        GetInitializedHttpClientInstance(),
                         overrideHttpClientConfiguration);
             }
+
+            private HttpClient GetInitializedHttpClientInstance()
+            {
+                if (overrideHttpClientConfiguration)
+                {
+                    if (skipSslCertVerification)
+                    {
+                        var httpClientHandler = new HttpClientHandler
+                        {
+                            ServerCertificateCustomValidationCallback = (message, cert, chain, errors) => { return true; }
+                        };
+                        return new HttpClient(httpClientHandler, disposeHandler: true)
+                        {
+                            Timeout = timeout,
+                        };
+                    }
+
+                    var httpClient = httpClientInstance ?? new HttpClient();
+                    httpClient.Timeout = timeout;
+
+                    return httpClient;
+                }
+
+                return httpClientInstance ?? new HttpClient();
+            }
         }
     }
 }

APIMatic.Core/Http/HttpClientWrapper.cs

@@ -58,7 +58,6 @@ public HttpClientWrapper(ICoreHttpClientConfiguration httpClientConfig)
                 _backoffFactor = httpClientConfig.BackoffFactor;
                 _retryInterval = httpClientConfig.RetryInterval;
                 _maximumRetryWaitTime = httpClientConfig.MaximumRetryWaitTime;
-                _client.Timeout = httpClientConfig.Timeout;
             }
         }
 
@@ -292,7 +291,6 @@ private double GetExponentialWaitTime(int retryAttempt)
         {
             double noise = new Random().NextDouble() * 100;
             return (1000 * _retryInterval * Math.Pow(_backoffFactor, retryAttempt - 1)) + noise;
-
         }
 
         private static Dictionary<string, string> GetCombinedResponseHeaders(HttpResponseMessage responseMessage)