auto generate jwt token for channel preview (#1588)

CHANGELOG.md

@@ -12,11 +12,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
   - Data protection keys will now be persisted under ErsatzTV's config folder instead of being recreated at startup
 - Fix bug updating/replacing Jellyfin movies
   - A deep scan can be used to fix all movies, otherwise any future updates made to JF movies will correctly sync to ETV
-
+- Automatically generate JWT tokens to allow channel previews of protected streams 
-### Changed
-- Pass through `access_token` query param from `Channels` page url to streaming endpoints
-  - This parameter isn't normally needed on the `Channels` page, since the web UI is not protected with JWT
-  - Its only purpose is to allow playback of authenticated channels in the web UI
 
 ## [0.8.5-beta] - 2024-01-30
 ### Added

ErsatzTV/JwtHelper.cs

@@ -1,3 +1,4 @@
+using System.IdentityModel.Tokens.Jwt;
 using System.Text;
 using Microsoft.IdentityModel.Tokens;
 
@@ -17,4 +18,16 @@ public static class JwtHelper
             IssuerSigningKey = new SymmetricSecurityKey(Encoding.ASCII.GetBytes(issuerSigningKey!));
         }
     }
+    
+    public static string GenerateToken()
+    {
+        var tokenHandler = new JwtSecurityTokenHandler();
+        var tokenDescriptor = new SecurityTokenDescriptor
+        {
+            Expires = DateTime.UtcNow.AddDays(1),
+            SigningCredentials = new SigningCredentials(IssuerSigningKey, SecurityAlgorithms.HmacSha256Signature)
+        };
+        SecurityToken token = tokenHandler.CreateToken(tokenDescriptor);
+        return tokenHandler.WriteToken(token);
+    }
 }

ErsatzTV/Pages/Channels.razor

@@ -184,11 +184,10 @@
 
             var uri = new UriBuilder(NavigationManager.ToAbsoluteUri(NavigationManager.Uri));
             uri.Path = uri.Path.Replace("/channels", $"/iptv/channel/{channel.Number}.m3u8");
-            string query = uri.Query;
             uri.Query = "?mode=segmenter";
-            if (QueryHelpers.ParseQuery(query).TryGetValue("access_token", out StringValues token))
+            if (JwtHelper.IsEnabled)
             {
-                uri.Query += $"&access_token={token.ToString()}";
+                uri.Query += $"&access_token={JwtHelper.GenerateToken()}";
             }
 
             var parameters = new DialogParameters { { "StreamUri", uri.ToString() } };