uri: support ports and split queries/fragments from path (#825)

GCM currently ignores ports in URIs. This means attempting to
authenticate to a URI with a port can lead to some unexpected behavior
(e.g. shortcutting the provider auto-detect process won't work, even if
the provider is set in config). This change adds support for ports by
updating GetGitConfigurationScopes() to recognize them.

This change also updates GetRemoteUri() to recognize paths with queries
and fragments, as that issue was uncovered during the implementation of
the GetGitConfigurationScopes() fix. Without it, input paths containing
queries and/or fragments get saved as part of Uri.Path, which converts
the query '?' and the fragment '#' to url encoding.

I validated these changes with unit tests for applicable scenarios and by
running a locally-compiled version of GCM with tracing enabled and the 
following config set:

`credential.http://localhost:7990/bitbucket.provider bitbucket`

Trace logs showed that the override was recognized and auto-detection
was skipped.

src/shared/Core.Tests/InputArgumentsTests.cs

@@ -220,6 +220,29 @@ public void InputArguments_GetRemoteUri_AuthorityPathUserInfo_ReturnsUriWithAuth
             Assert.Equal(expectedUri, actualUri);
         }
 
+        [Theory]
+        [InlineData("foo?query=true")]
+        [InlineData("foo#fragment")]
+        [InlineData("foo?query=true#fragment")]
+        public void InputArguments_GetRemoteUri_PathQueryFragment_ReturnsCorrectUri(string path)
+        {
+            var expectedUri = new Uri($"https://example.com/{path}");
+
+            var dict = new Dictionary<string, string>
+            {
+                ["protocol"] = "https",
+                ["host"]     = "example.com",
+                ["path"]     = path
+            };
+
+            var inputArgs = new InputArguments(dict);
+
+            Uri actualUri = inputArgs.GetRemoteUri();
+
+            Assert.NotNull(actualUri);
+            Assert.Equal(expectedUri, actualUri);
+        }
+
         [Fact]
         public void InputArguments_GetRemoteUri_IncludeUser_AuthorityPathUserInfo_ReturnsUriWithAll()
         {

src/shared/Core.Tests/UriExtensionsTests.cs

@@ -30,12 +30,11 @@ public void UriExtensions_GetQueryParameters()
         [InlineData("http://hostname", "http://hostname")]
         [InlineData("http://example.com",
             "http://example.com")]
+        [InlineData("http://hostname:7990", "http://hostname:7990")]
         [InlineData("http://foo.example.com",
             "http://foo.example.com", "http://example.com")]
         [InlineData("http://example.com/foo",
             "http://example.com/foo", "http://example.com")]
-        [InlineData("http://example.com/foo/",
-            "http://example.com/foo", "http://example.com")]
         [InlineData("http://example.com/foo?query=true#fragment",
             "http://example.com/foo", "http://example.com")]
         [InlineData("http://buzz.foo.example.com/bar/baz",

src/shared/Core/InputArguments.cs

@@ -1,6 +1,7 @@
 using System;
 using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Linq;
 
 namespace GitCredentialManager
 {
@@ -94,10 +95,7 @@ public Uri GetRemoteUri(bool includeUser = false)
             string[] hostParts = Host.Split(':');
             if (hostParts.Length > 0)
             {
-                var ub = new UriBuilder(Protocol, hostParts[0])
-                {
-                    Path = Path
-                };
+                var ub = new UriBuilder(Protocol, hostParts[0]);
 
                 if (hostParts.Length > 1 && int.TryParse(hostParts[1], out int port))
                 {
@@ -109,6 +107,28 @@ public Uri GetRemoteUri(bool includeUser = false)
                     ub.UserName = Uri.EscapeDataString(UserName);
                 }
 
+                if (Path != null)
+                {
+                    string[] pathParts = Path.Split('?', '#');
+                    // We know the first piece is the path
+                    ub.Path = pathParts[0];
+
+                    switch (pathParts.Length)
+                    {
+                        // If we have 3 items, that means path, query, and fragment
+                        case 3:
+                            ub.Query = pathParts[1];
+                            ub.Fragment = pathParts[2];
+                            break;
+                        // If we have 2 items, we must distinguish between query and fragment
+                        case 2 when Path.Contains('?'):
+                            ub.Query = pathParts[1];
+                            break;
+                        case 2 when Path.Contains('#'):
+                            ub.Fragment = pathParts[1];
+                            break;
+                    }
+                }
                 return ub.Uri;
             }
 

src/shared/Core/UriExtensions.cs

@@ -88,12 +88,14 @@ public static IEnumerable<string> GetGitConfigurationScopes(this Uri uri)
 
             string schemeAndDelim = $"{uri.Scheme}{Uri.SchemeDelimiter}";
             string host = uri.Host.TrimEnd('/');
+            // If port is default, don't append
+            string port = uri.IsDefaultPort ? "" : $":{uri.Port}";
             string path = uri.AbsolutePath.Trim('/');
 
             // Unfold the path by component, right-to-left
             while (!string.IsNullOrWhiteSpace(path))
             {
-                yield return $"{schemeAndDelim}{host}/{path}";
+                yield return $"{schemeAndDelim}{host}{port}/{path}";
 
                 // Trim off the last path component
                 if (!TryTrimString(path, StringExtensions.TruncateFromLastIndexOf, '/', out path))
@@ -107,7 +109,7 @@ public static IEnumerable<string> GetGitConfigurationScopes(this Uri uri)
             if (!string.IsNullOrWhiteSpace(host) &&
                 !host.Contains("."))
             {
-                yield return $"{schemeAndDelim}{host}";
+                yield return $"{schemeAndDelim}{host}{port}";
                 // If we have reached this point, there are no more subdomains to unfold, so exit early.
                 yield break;
             }
@@ -117,7 +119,7 @@ public static IEnumerable<string> GetGitConfigurationScopes(this Uri uri)
             {
                 if (host.Contains(".")) // Do not emit just the TLD
                 {
-                    yield return $"{schemeAndDelim}{host}";
+                    yield return $"{schemeAndDelim}{host}{port}";
                 }
 
                 // Trim off the left-most sub-domain