Use UriHelper.BuildAbsolute for RedirectToHttpsRule

src/Middleware/Rewrite/src/RedirectToHttpsRule.cs

@@ -1,8 +1,8 @@
 // Copyright (c) .NET Foundation. All rights reserved.
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
-using System.Text;
 using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Http.Extensions;
 using Microsoft.AspNetCore.Rewrite.Logging;
 using Microsoft.Net.Http.Headers;
 
@@ -18,10 +18,11 @@ public virtual void ApplyRule(RewriteContext context)
             if (!context.HttpContext.Request.IsHttps)
             {
                 var host = context.HttpContext.Request.Host;
-                if (SSLPort.HasValue && SSLPort.Value > 0)
+                int port;
+                if (SSLPort.HasValue && (port = SSLPort.GetValueOrDefault()) > 0)
                 {
                     // a specific SSL port is specified
-                    host = new HostString(host.Host, SSLPort.Value);
+                    host = new HostString(host.Host, port);
                 }
                 else
                 {
@@ -30,10 +31,10 @@ public virtual void ApplyRule(RewriteContext context)
                 }
 
                 var req = context.HttpContext.Request;
-                var newUrl = new StringBuilder().Append("https://").Append(host).Append(req.PathBase).Append(req.Path).Append(req.QueryString);
+                var newUrl = UriHelper.BuildAbsolute("https", host, req.PathBase, req.Path, req.QueryString, default);
                 var response = context.HttpContext.Response;
                 response.StatusCode = StatusCode;
-                response.Headers[HeaderNames.Location] = newUrl.ToString();
+                response.Headers[HeaderNames.Location] = newUrl;
                 context.Result = RuleResult.EndResponse;
                 context.Logger.RedirectedToHttps();
             }

src/Middleware/Rewrite/test/MiddlewareTests.cs

@@ -2,6 +2,7 @@
 // Licensed under the Apache License, Version 2.0. See License.txt in the project root for license information.
 
 using System;
+using System.Globalization;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.Hosting;
@@ -128,7 +129,7 @@ public async Task CheckRedirectPathWithQueryString()
         [InlineData(StatusCodes.Status302Found)]
         [InlineData(StatusCodes.Status307TemporaryRedirect)]
         [InlineData(StatusCodes.Status308PermanentRedirect)]
-        public async Task CheckRedirectToHttps(int statusCode)
+        public async Task CheckRedirectToHttpsStatus(int statusCode)
         {
             var options = new RewriteOptions().AddRedirectToHttps(statusCode: statusCode);
             using var host = new HostBuilder()
@@ -152,6 +153,78 @@ public async Task CheckRedirectToHttps(int statusCode)
             Assert.Equal(statusCode, (int)response.StatusCode);
         }
 
+        [Theory]
+        [InlineData(null)]
+        [InlineData(123)]
+        public async Task CheckRedirectToHttpsSslPort(int? sslPort)
+        {
+            var options = new RewriteOptions().AddRedirectToHttps(statusCode: StatusCodes.Status302Found, sslPort: sslPort);
+            using var host = new HostBuilder()
+                .ConfigureWebHost(webHostBuilder =>
+                {
+                    webHostBuilder
+                    .UseTestServer()
+                    .Configure(app =>
+                    {
+                        app.UseRewriter(options);
+                    });
+                }).Build();
+
+            await host.StartAsync();
+
+            var server = host.GetTestServer();
+
+            var response = await server.CreateClient().GetAsync(new Uri("http://example.com"));
+
+            if (sslPort.HasValue)
+            {
+                Assert.Equal($"https://example.com:{sslPort.GetValueOrDefault().ToString(CultureInfo.InvariantCulture)}/", response.Headers.Location.OriginalString);
+            }
+            else
+            {
+                Assert.Equal("https://example.com/", response.Headers.Location.OriginalString);
+            }
+        }
+
+        [Theory]
+        [InlineData(null, "example.com", "example.com/")]
+        [InlineData(null, "example.com/path", "example.com/path")]
+        [InlineData(null, "example.com/path?name=value", "example.com/path?name=value")]
+        [InlineData(null, "hoψst.com", "xn--host-cpd.com/")]
+        [InlineData(null, "hoψst.com/path", "xn--host-cpd.com/path")]
+        [InlineData(null, "hoψst.com/path?name=value", "xn--host-cpd.com/path?name=value")]
+        [InlineData(null, "example.com/pãth", "example.com/p%C3%A3th")]
+        [InlineData(null, "example.com/path?näme=valüe", "example.com/path?n%C3%A4me=val%C3%BCe")]
+        [InlineData("example.com/pathBase", "example.com/pathBase/path", "example.com/pathBase/path")]
+        [InlineData("example.com/pathBase", "example.com/pathBase", "example.com/pathBase")]
+        [InlineData("example.com/pâthBase", "example.com/pâthBase/path", "example.com/p%C3%A2thBase/path")]
+        public async Task CheckRedirectToHttpsUrl(string baseAddress, string hostPathAndQuery, string expectedHostPathAndQuery)
+        {
+            var options = new RewriteOptions().AddRedirectToHttps();
+            using var host = new HostBuilder()
+                .ConfigureWebHost(webHostBuilder =>
+                {
+                    webHostBuilder
+                    .UseTestServer()
+                    .Configure(app =>
+                    {
+                        app.UseRewriter(options);
+                    });
+                }).Build();
+
+            await host.StartAsync();
+
+            var server = host.GetTestServer();
+            if (!string.IsNullOrEmpty(baseAddress))
+            {
+                server.BaseAddress = new Uri("http://" + baseAddress);
+            }
+
+            var response = await server.CreateClient().GetAsync(new Uri("http://" + hostPathAndQuery));
+
+            Assert.Equal("https://" + expectedHostPathAndQuery, response.Headers.Location.OriginalString);
+        }
+
         [Fact]
         public async Task CheckPermanentRedirectToHttps()
         {