Add base URL to variant playlists (#2755)

* Add PathBase to variant playlists

* add commented code to help with testing

* update changelog

---------

Co-authored-by: Jason Dove <1695733+jasongdove@users.noreply.github.com>

CHANGELOG.md

@@ -73,6 +73,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 - Fix multi-part episode grouping logic so that it does NOT require release date metadata for episodes within a single show
   - When **Treat Collections As Shows** is enabled (i.e. for crossover episodes) release date metadata is required for proper grouping
 - Fix *many* cases of duplicate names; enforce case-insensitive unique names at the db schema level
+- Fix playback when using `ETV_BASE_URL` by @JamesDearlove
 
 ### Changed
 - No longer round framerate to nearest integer when normalizing framerate

ErsatzTV/Controllers/IptvController.cs

@@ -292,7 +292,7 @@ public class IptvController : StreamingControllerBase
     private async Task<string> GetMultiVariantPlaylist(string channelNumber)
     {
         var variantPlaylist =
-            $"{Request.Scheme}://{Request.Host}/iptv/session/{channelNumber}/hls.m3u8{AccessTokenQuery()}";
+            $"{Request.Scheme}://{Request.Host}{Request.PathBase}/iptv/session/{channelNumber}/hls.m3u8{AccessTokenQuery()}";
 
         Option<ChannelStreamingSpecsViewModel> maybeStreamingSpecs =
             await _mediator.Send(new GetChannelStreamingSpecs(channelNumber));

ErsatzTV/Startup.cs

@@ -527,6 +527,18 @@ public class Startup
             try
             {
                 app.UsePathBase(baseUrl);
+
+                // for testing - make path base required
+                // app.Use(async (context, next) =>
+                // {
+                //     if (context.Request.PathBase != baseUrl)
+                //     {
+                //         context.Response.StatusCode = 404;
+                //         return;
+                //     }
+                //
+                //     await next(context);
+                // });
             }
             catch (Exception ex)
             {