Example #1
0
        public void EvaluatePolicy_PreflightRequest_HeadersRequested_NotAllHeaderMatches_ReturnsInvalidResult()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };

            requestContext.AccessControlRequestHeaders.Add("match");
            requestContext.AccessControlRequestHeaders.Add("noMatch");
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true
            };

            policy.Headers.Add("match");
            policy.Headers.Add("foo");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.False(result.IsValid);
            Assert.Contains("The collection of headers 'match,noMatch' is not allowed.", result.ErrorMessages);
        }
Example #2
0
        public void EvaluatePolicy_PreflightRequest_HeadersRequested_AllowSomeHeaders_ReturnsSubsetOfListedHeaders()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };

            requestContext.AccessControlRequestHeaders.Add("Content-Type");
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true
            };

            policy.Headers.Add("foo");
            policy.Headers.Add("bar");
            policy.Headers.Add("Content-Type");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal(1, result.AllowedHeaders.Count);
            Assert.Contains("Content-Type", result.AllowedHeaders);
        }
        public void EvaluatePolicy_NullRequest_Throws()
        {
            CorsEngine corsEngine = new CorsEngine();

            Assert.ThrowsArgumentNull(() =>
                corsEngine.EvaluatePolicy(null, new CorsPolicy()),
                "requestContext");
        }
Example #4
0
        public void EvaluatePolicy_NullRequest_Throws()
        {
            CorsEngine corsEngine = new CorsEngine();

            Assert.ThrowsArgumentNull(() =>
                                      corsEngine.EvaluatePolicy(null, new CorsPolicy()),
                                      "requestContext");
        }
Example #5
0
        public void EvaluatePolicy_NullPolicy_Throws()
        {
            CorsEngine corsEngine = new CorsEngine();

            Assert.ThrowsArgumentNull(() =>
                                      corsEngine.EvaluatePolicy(new CorsRequestContext(), null),
                                      "policy");
        }
        public void EvaluatePolicy_NullPolicy_Throws()
        {
            CorsEngine corsEngine = new CorsEngine();

            Assert.ThrowsArgumentNull(() =>
                corsEngine.EvaluatePolicy(new CorsRequestContext(), null),
                "policy");
        }
 public static IDictionary <string, string> GetCorsResponseHeaders(
     this CorsEngine corsEngine,
     CorsRequestContext context,
     CorsOptions options)
 {
     return(corsEngine
            .EvaluatePolicy(context, options.GetCorsPolicy())
            .ToResponseHeaders() ?? new Dictionary <string, string>());
 }
        public static bool EvaluateCorsPolicy(
            this CorsEngine corsEngine,
            CorsRequestContext context,
            CorsOptions options)
        {
            var result = corsEngine.EvaluatePolicy(context, options.GetCorsPolicy());

            return(result.IsNotNull() && result.IsValid);
        }
Example #9
0
        public void EvaluatePolicy_EmptyOriginsPolicy_ReturnsInvalidResult()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy();

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.False(result.IsValid);
            Assert.Contains("The origin 'foo' is not allowed.", result.ErrorMessages);
        }
        public void EvaluatePolicy_NoOrigin_ReturnsInvalidResult()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                Origin = null,
                HttpMethod = "GET"
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, new CorsPolicy());

            Assert.False(result.IsValid);
            Assert.Contains("The request does not contain the Origin header.", result.ErrorMessages);
        }
        public void EvaluatePolicy_EmptyOriginsPolicy_ReturnsInvalidResult()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy();

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.False(result.IsValid);
            Assert.Contains("The origin 'foo' is not allowed.", result.ErrorMessages);
        }
Example #12
0
        public void EvaluatePolicy_NoOrigin_ReturnsInvalidResult()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                Origin     = null,
                HttpMethod = "GET"
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, new CorsPolicy());

            Assert.False(result.IsValid);
            Assert.Contains("The request does not contain the Origin header.", result.ErrorMessages);
        }
Example #13
0
        public void EvaluatePolicy_NoExposedHeaders_NoAllowExposedHeaders()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy {
                AllowAnyOrigin = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.Empty(result.AllowedExposedHeaders);
        }
Example #14
0
        public void EvaluatePolicy_AllowAnyOrigin_DoesNotSupportCredentials_EmitsWildcardForOrigin()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin      = true,
                SupportsCredentials = false
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.Equal("*", result.AllowedOrigin);
        }
Example #15
0
        public void EvaluatePolicy_AllowAnyOrigin_SupportsCredentials_AddsSpecificOrigin()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin      = true,
                SupportsCredentials = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.Equal("foo", result.AllowedOrigin);
        }
Example #16
0
        public void EvaluatePolicy_SupportsCredentials_AllowCredentialsReturnsTrue()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin      = true,
                SupportsCredentials = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(result.SupportsCredentials);
        }
Example #17
0
        public void EvaluatePolicy_OneExposedHeaders_HeadersAllowed()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy {
                AllowAnyOrigin = true
            };

            policy.ExposedHeaders.Add("foo");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.Equal(1, result.AllowedExposedHeaders.Count);
            Assert.Contains("foo", result.AllowedExposedHeaders);
        }
Example #18
0
        public void EvaluatePolicy_PreflightRequest_AnyMethod_ReturnsRequestMethod()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "GET",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy {
                AllowAnyOrigin = true, AllowAnyMethod = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal(1, result.AllowedMethods.Count);
            Assert.Contains("GET", result.AllowedMethods);
        }
Example #19
0
        public void EvaluatePolicy_PreflightRequest_OriginAllowed_ReturnsOrigin()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy {
                AllowAnyMethod = true
            };

            policy.Origins.Add("foo");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal("foo", result.AllowedOrigin);
        }
Example #20
0
        public void EvaluatePolicy_PreflightRequest_NoHeadersRequested_AllowedAllHeaders_ReturnsEmptyHeaders()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo",
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true,
                AllowAnyHeader = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Empty(result.AllowedHeaders);
        }
Example #21
0
        public void EvaluatePolicy_PreflightRequest_MethodAllowed_ReturnsAllowMethods()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy {
                AllowAnyOrigin = true
            };

            policy.Methods.Add("PUT");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.NotNull(result);
            Assert.Contains("PUT", result.AllowedMethods);
        }
Example #22
0
        public void EvaluatePolicy_PreflightRequest_MethodNotAllowed_ReturnsInvalidResult()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy {
                AllowAnyOrigin = true
            };

            policy.Methods.Add("GET");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.False(result.IsValid);
            Assert.Contains("The method 'PUT' is not allowed.", result.ErrorMessages);
        }
Example #23
0
        public void EvaluatePolicy_PreflightRequest_SupportsCredentials_AllowCredentialsReturnsTrue()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo",
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin      = true,
                AllowAnyMethod      = true,
                SupportsCredentials = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.True(result.SupportsCredentials);
        }
Example #24
0
        public void EvaluatePolicy_PreflightRequest_PreflightMaxAge_PreflightMaxAgeSet()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo",
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin  = true,
                AllowAnyMethod  = true,
                PreflightMaxAge = 10
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal(10, result.PreflightMaxAge);
        }
Example #25
0
        public void EvaluatePolicy_PreflightRequest_ListedMethod_ReturnsSubsetOfListedMethods()
        {
            CorsEngine         corsEngine     = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true
            };

            policy.Methods.Add("PUT");
            policy.Methods.Add("DELETE");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal(1, result.AllowedMethods.Count());
            Assert.Contains("PUT", result.AllowedMethods);
        }
        public void EvaluatePolicy_PreflightRequest_NoHeadersRequested_AllowedAllHeaders_ReturnsEmptyHeaders()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo",
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true,
                AllowAnyHeader = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Empty(result.AllowedHeaders);
        }
        public void EvaluatePolicy_PreflightRequest_MethodAllowed_ReturnsAllowMethods()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true
            };
            policy.Methods.Add("PUT");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.NotNull(result);
            Assert.Contains("PUT", result.AllowedMethods);
        }
        public void EvaluatePolicy_PreflightRequest_MethodNotAllowed_ReturnsInvalidResult()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true
            };
            policy.Methods.Add("GET");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.False(result.IsValid);
            Assert.Contains("The method 'PUT' is not allowed.", result.ErrorMessages);
        }
        public void EvaluatePolicy_AllowAnyOrigin_SupportsCredentials_AddsSpecificOrigin()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                SupportsCredentials = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.Equal("foo", result.AllowedOrigin);
        }
        public void EvaluatePolicy_SupportsCredentials_AllowCredentialsReturnsTrue()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                SupportsCredentials = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(result.SupportsCredentials);
        }
        public void EvaluatePolicy_AllowAnyOrigin_DoesNotSupportCredentials_EmitsWildcardForOrigin()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                SupportsCredentials = false
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.Equal("*", result.AllowedOrigin);
        }
        public void EvaluatePolicy_PreflightRequest_PreflightMaxAge_PreflightMaxAgeSet()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo",
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true,
                PreflightMaxAge = 10
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal(10, result.PreflightMaxAge);
        }
        public void EvaluatePolicy_NoExposedHeaders_NoAllowExposedHeaders()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.Empty(result.AllowedExposedHeaders);
        }
        public void EvaluatePolicy_PreflightRequest_AnyMethod_ReturnsRequestMethod()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "GET",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal(1, result.AllowedMethods.Count);
            Assert.Contains("GET", result.AllowedMethods);
        }
        public void EvaluatePolicy_PreflightRequest_ListedMethod_ReturnsSubsetOfListedMethods()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true
            };
            policy.Methods.Add("PUT");
            policy.Methods.Add("DELETE");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal(1, result.AllowedMethods.Count());
            Assert.Contains("PUT", result.AllowedMethods);
        }
        public void EvaluatePolicy_PreflightRequest_HeadersRequested_AllowSomeHeaders_ReturnsSubsetOfListedHeaders()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            requestContext.AccessControlRequestHeaders.Add("Content-Type");
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true
            };
            policy.Headers.Add("foo");
            policy.Headers.Add("bar");
            policy.Headers.Add("Content-Type");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal(1, result.AllowedHeaders.Count);
            Assert.Contains("Content-Type", result.AllowedHeaders);
        }
        public void EvaluatePolicy_PreflightRequest_HeadersRequested_NotAllHeaderMatches_ReturnsInvalidResult()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            requestContext.AccessControlRequestHeaders.Add("match");
            requestContext.AccessControlRequestHeaders.Add("noMatch");
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true
            };
            policy.Headers.Add("match");
            policy.Headers.Add("foo");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.False(result.IsValid);
            Assert.Contains("The collection of headers 'match,noMatch' is not allowed.", result.ErrorMessages);
        }
        public void EvaluatePolicy_PreflightRequest_OriginAllowed_ReturnsOrigin()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyMethod = true
            };
            policy.Origins.Add("foo");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.Equal("foo", result.AllowedOrigin);
        }
        public void EvaluatePolicy_ManyExposedHeaders_HeadersAllowed()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                Origin = "foo"
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true
            };
            policy.ExposedHeaders.Add("foo");
            policy.ExposedHeaders.Add("bar");
            policy.ExposedHeaders.Add("baz");

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.Equal(3, result.AllowedExposedHeaders.Count());
            Assert.Contains("foo", result.AllowedExposedHeaders);
            Assert.Contains("bar", result.AllowedExposedHeaders);
            Assert.Contains("baz", result.AllowedExposedHeaders);
        }
Example #40
0
        private void ProcessCors(OAuthValidateTokenRequestContext context)
        {
            var accessControlRequestMethodHeaders = context.Request.Headers.GetCommaSeparatedValues(CorsConstants.AccessControlRequestMethod);
            var originHeaders = context.Request.Headers.GetCommaSeparatedValues(CorsConstants.Origin);
            var accessControlRequestHeaders = context.Request.Headers.GetCommaSeparatedValues(CorsConstants.AccessControlRequestMethod);
            var corsRequest = new CorsRequestContext
            {
                Host       = context.Request.Host.Value,
                HttpMethod = context.Request.Method,
                Origin     = originHeaders?.FirstOrDefault(),
                RequestUri = context.Request.Uri,
                AccessControlRequestMethod = accessControlRequestMethodHeaders?.FirstOrDefault()
            };

            if (accessControlRequestHeaders != null)
            {
                foreach (var header in context.Request.Headers.GetCommaSeparatedValues(CorsConstants.AccessControlRequestMethod))
                {
                    corsRequest.AccessControlRequestHeaders.Add(header);
                }
            }

            var engine = new CorsEngine();

            if (corsRequest.IsPreflight)
            {
                try
                {
                    // Make sure Access-Control-Request-Method is valid.
                    var test = new HttpMethod(corsRequest.AccessControlRequestMethod);
                }
                catch (ArgumentException)
                {
                    context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
                    context.SetError("Access Control Request Method Cannot Be Null Or Empty");
                    //context.RequestCompleted();
                    return;
                }
                catch (FormatException)
                {
                    context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
                    context.SetError("Invalid Access Control Request Method");
                    //context.RequestCompleted();
                    return;
                }

                var result = engine.EvaluatePolicy(corsRequest, _options.CorsPolicy);

                if (!result.IsValid)
                {
                    context.Response.StatusCode = (int)HttpStatusCode.BadRequest;
                    context.SetError(string.Join(" | ", result.ErrorMessages));
                    //context.RequestCompleted();
                    return;
                }

                WriteCorsHeaders(result, context);
            }
            else
            {
                var result = engine.EvaluatePolicy(corsRequest, _options.CorsPolicy);

                if (result.IsValid)
                {
                    WriteCorsHeaders(result, context);
                }
            }
        }
        public void EvaluatePolicy_PreflightRequest_SupportsCredentials_AllowCredentialsReturnsTrue()
        {
            CorsEngine corsEngine = new CorsEngine();
            CorsRequestContext requestContext = new CorsRequestContext
            {
                HttpMethod = "OPTIONS",
                AccessControlRequestMethod = "PUT",
                Origin = "foo",
            };
            CorsPolicy policy = new CorsPolicy
            {
                AllowAnyOrigin = true,
                AllowAnyMethod = true,
                SupportsCredentials = true
            };

            CorsResult result = corsEngine.EvaluatePolicy(requestContext, policy);

            Assert.True(requestContext.IsPreflight);
            Assert.True(result.SupportsCredentials);
        }