Improve validation for AET, IP & hostnames/domain names

src/Configuration/Test/ValidationExtensionsTest.cs

@@ -15,6 +15,7 @@
  */
 
 using System;
+using System.Collections.Generic;
 using FellowOakDicom;
 using Monai.Deploy.InformaticsGateway.Api;
 using Xunit;
@@ -202,5 +203,88 @@ public void SourceApplicationEntity_Valid()
         }
 
         #endregion SourceApplicationEntity.IsValid
+
+        #region IsAeTitleValid
+        [Theory]
+        [InlineData("123")]
+        [InlineData("MYAET")]
+        [InlineData("EAST-123-123")]
+        public void GivenAValidAETitle_WhenIIsAeTitleValid_ExpectToReturnTrue(string value)
+        {
+            var errors = new List<string>();
+            Assert.True(ValidationExtensions.IsAeTitleValid("test", value, errors));
+            Assert.Empty(errors);
+        }
+
+        [Theory]
+        [InlineData("")]
+        [InlineData("                             ")]
+        [InlineData("AE\\")]
+        [InlineData("AE/")]
+        [InlineData("1$")]
+        [InlineData("A.E.T.")]
+        public void GivenAnInvalidAETitle_WhenIsAeTitleValid_ExpectToReturnFalse(string value)
+        {
+            var errors = new List<string>();
+            Assert.False(ValidationExtensions.IsAeTitleValid("test", value, errors));
+            Assert.NotEmpty(errors);
+        }
+
+        #endregion
+
+        #region IsValidHostNameIp
+        [Theory]
+        [InlineData("0.0.0.0")]
+        [InlineData("10.20.30.40")]
+        [InlineData("255.255.255.0")]
+        [InlineData("1.2.3.4")]
+        [InlineData("192.168.0.1")]
+        public void GivenAValidIpAddress_WhenIsValidHostNameIpIsCalled_ExpectToReturnTrue(string value)
+        {
+            var errors = new List<string>();
+            Assert.True(ValidationExtensions.IsValidHostNameIp("test", value, errors));
+            Assert.Empty(errors);
+        }
+
+        [Theory]
+        [InlineData("256.256.256.256")]
+        [InlineData("1.0")]
+        [InlineData("1")]
+        [InlineData("2.3.4")]
+        public void GivenAnInvalidIpAddress_WhenIsValidHostNameIpIsCalled_ExpectToReturnFalse(string value)
+        {
+            var errors = new List<string>();
+            Assert.False(ValidationExtensions.IsValidHostNameIp("test", value, errors));
+            Assert.NotEmpty(errors);
+        }
+
+        [Theory]
+        [InlineData("localhost")]
+        [InlineData("east-1")]
+        [InlineData("east-2.k8s.local")]
+        [InlineData("cloud.com")]
+        [InlineData("east.cloud.com")]
+        [InlineData("super.west.cloud.com")]
+        [InlineData("example-mongodb-0.example-mongodb-svc.monai-deploy.svc.cluster.local")]
+        public void GivenAValidHostName_WhenIsValidHostNameIpIsCalled_ExpectToReturnTrue(string value)
+        {
+            var errors = new List<string>();
+            Assert.True(ValidationExtensions.IsValidHostNameIp("test", value, errors));
+            Assert.Empty(errors);
+        }
+
+        [Theory]
+        [InlineData("localhost!")]
+        [InlineData("cloud@com")]
+        [InlineData("[email protected]")]
+        [InlineData("super/west.cloud.com")]
+        public void GivenAnInvalidHostName_WhenIsValidHostNameIpIsCalled_ExpectToReturnFalse(string value)
+        {
+            var errors = new List<string>();
+            Assert.False(ValidationExtensions.IsValidHostNameIp("test", value, errors));
+            Assert.NotEmpty(errors);
+        }
+
+        #endregion
     }
 }

src/Configuration/ValidationExtensions.cs

@@ -17,6 +17,7 @@
 
 using System.Collections.Generic;
 using System.Linq;
+using System.Text.RegularExpressions;
 using Ardalis.GuardClauses;
 using FellowOakDicom;
 using Monai.Deploy.InformaticsGateway.Api;
@@ -94,15 +95,25 @@ public static bool IsAeTitleValid(string source, string aeTitle, IList<string> v
         {
             Guard.Against.NullOrWhiteSpace(source);
 
-            if (!string.IsNullOrWhiteSpace(aeTitle) && aeTitle.Length <= 15) return true;
+            if (!string.IsNullOrWhiteSpace(aeTitle) &&
+                aeTitle.Length <= 15 &&
+                Regex.IsMatch(aeTitle, @"^[a-zA-Z0-9_\-]+$"))
+            {
+                return true;
+            }
 
             validationErrors?.Add($"'{aeTitle}' is not a valid AE Title (source: {source}).");
             return false;
         }
 
         public static bool IsValidHostNameIp(string source, string hostIp, IList<string> validationErrors = null)
         {
-            if (!string.IsNullOrWhiteSpace(hostIp)) return true;
+            if (!string.IsNullOrWhiteSpace(hostIp) &&
+                (Regex.IsMatch(hostIp, @"^((25[0-5]|(2[0-4]|1\d|[1-9]|)\d)\.?\b){4}$") || // IP address
+                 Regex.IsMatch(hostIp, @"^(([a-zA-Z]|[a-zA-Z][a-zA-Z0-9\-]*[a-zA-Z0-9])\.)*([A-Za-z]|[A-Za-z][A-Za-z0-9\-]*[A-Za-z0-9])$"))) // Host/domain name
+            {
+                return true;
+            }
 
             validationErrors?.Add($"Invalid host name/IP address '{hostIp}' specified for {source}.");
             return false;