Fix URI parsing for IPv6 addresses and add tests.

Closes #5057

Duplicati/Library/Utility/Uri.cs

@@ -34,7 +34,7 @@ namespace Duplicati.Library.Utility
         /// <summary>
         /// A very lax version of a URL parser
         /// </summary>
-        private static readonly System.Text.RegularExpressions.Regex URL_PARSER = new System.Text.RegularExpressions.Regex(@"(?<scheme>[^:]+)://(((?<username>[^\:\?/]+)(\:(?<password>[^@\:\?/]*))?\@))?((?<hostname>[^/\?\:]+)(\:(?<port>\d+))?)?((?<path>[^\?]*))?(\?(?<query>.+))?");
+        private static readonly System.Text.RegularExpressions.Regex URL_PARSER = new System.Text.RegularExpressions.Regex(@"(?<scheme>[^:]+)://(((?<username>[^\:\?/]+)(\:(?<password>[^@\:\?/]*))?\@))?((?<hostname>(?:[^\[/\?\:][^/\?\:]*)|(?:\[[^\]]+\]))(\:(?<port>\d+))?)?((?<path>[^\?]*))?(\?(?<query>.+))?");
 
         /// <summary>
         /// The URL scheme, e.g. http

Duplicati/UnitTest/UriUtilityTests.cs

@@ -17,11 +17,11 @@
 
 using NUnit.Framework;
 using System.Collections.Specialized;
-
-namespace Duplicati.UnitTest
-{
-    public class UriUtilityTests
-    {
+
+namespace Duplicati.UnitTest
+{
+    public class UriUtilityTests
+    {
         [Test]
         [Category("UriUtility")]
         public static void TestBuildUriQuery()
@@ -65,5 +65,48 @@ namespace Duplicati.UnitTest
             Assert.AreEqual("/a", Library.Utility.UrlPath.Create(path1).Append(null).ToString());
             Assert.AreEqual("/b/", Library.Utility.UrlPath.Create(string.Empty).Append(path2).ToString());
         }
-    }
-}
+
+        [Test]
+        [Category("UriUtility")]
+        public static void TestUriParse(
+            [Values("[1:2:3::4]", "127.0.0.1", "hostname")] string host,
+            [Values("", "user@", "user:pw@")] string user,
+            [Values("", ":80")] string port,
+            [Values("", "/path")] string path,
+            [Values("", "?query")] string query)
+        {
+            string uriStr = $"http://{user}{host}{port}{path}{query}";
+
+            var uri = new Library.Utility.Uri(uriStr);
+            Assert.AreEqual("http", uri.Scheme);
+            Assert.AreEqual(host, uri.Host);
+            if (port.Length != 0)
+            {
+                Assert.AreEqual(80, uri.Port);
+            }
+            else
+            {
+                Assert.AreEqual(-1, uri.Port);
+            }
+            Assert.AreEqual(path.TrimStart('/'), uri.Path);
+            Assert.AreEqual(query.Length == 0 ? null : query.TrimStart('?'), uri.Query);
+            if (user.Length == 0)
+            {
+                Assert.IsNull(uri.Username);
+                Assert.IsNull(uri.Password);
+            }
+            else
+            {
+                Assert.AreEqual("user", uri.Username);
+                if (user.Contains(":"))
+                {
+                    Assert.AreEqual("pw", uri.Password);
+                }
+                else
+                {
+                    Assert.IsNull(uri.Password);
+                }
+            }
+        }
+    }
+}