From 07600766cf969c40a22731d66bd251047da285a6 Mon Sep 17 00:00:00 2001
From: CodeDevMLH <145071728+CodeDevMLH@users.noreply.github.com>
Date: Thu, 19 Feb 2026 18:31:10 +0100
Subject: [PATCH] Add legacy tag removal functionality to ScriptInjector

---
 Injector_new.cs                             | 207 ++++++++++++++++++++
 Jellyfin.Plugin.Seasonals/ScriptInjector.cs |  41 ++++
 2 files changed, 248 insertions(+)
 create mode 100644 Injector_new.cs

diff --git a/Injector_new.cs b/Injector_new.cs
new file mode 100644
index 0000000..db0305f
--- /dev/null
+++ b/Injector_new.cs
@@ -0,0 +1,207 @@
+using System;
+using System.IO;
+using System.Reflection;
+using System.Runtime.Loader;
+using Microsoft.Extensions.Logging;
+using Newtonsoft.Json.Linq;
+using MediaBrowser.Common.Configuration;
+using Jellyfin.Plugin.Seasonals.Helpers;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace Jellyfin.Plugin.Seasonals;
+
+/// <summary>
+/// Handles the injection of the Seasonals script into the Jellyfin web interface.
+/// </summary>
+public class ScriptInjector
+{
+    private readonly IApplicationPaths _appPaths;
+    private readonly ILogger<ScriptInjector> _logger;
+    public const string ScriptTag = "<script src=\"../Seasonals/Resources/seasonals.js\" defer></script>";
+    public const string Marker = "</body>";
+
+    /// <summary>
+    /// Initializes a new instance of the <see cref="ScriptInjector"/> class.
+    /// </summary>
+    /// <param name="appPaths">The application paths.</param>
+    /// <param name="logger">The logger.</param>
+    public ScriptInjector(IApplicationPaths appPaths, ILogger<ScriptInjector> logger)
+    {
+        _appPaths = appPaths;
+        _logger = logger;
+    }
+
+    /// <summary>
+    /// Injects the script tag into index.html if it's not already present.
+    /// </summary>
+    public void Inject()
+    {
+        try
+        {
+            var webPath = GetWebPath();
+            if (string.IsNullOrEmpty(webPath))
+            {
+                _logger.LogWarning("Could not find Jellyfin web path. Script injection skipped. Attempting fallback.");
+                RegisterFileTransformation();
+                return;
+            }
+
+            var indexPath = Path.Combine(webPath, "index.html");
+            if (!File.Exists(indexPath))
+            {
+                _logger.LogWarning("index.html not found at {Path}. Script injection skipped. Attempting fallback.", indexPath);
+                RegisterFileTransformation();
+                return;
+            }
+
+            var content = File.ReadAllText(indexPath);
+            if (!content.Contains(ScriptTag))
+            {
+                var index = content.IndexOf(Marker, StringComparison.OrdinalIgnoreCase);
+                if (index != -1)
+                {
+                    content = content.Insert(index, ScriptTag + Environment.NewLine);
+                    File.WriteAllText(indexPath, content);
+                    _logger.LogInformation("Successfully injected Seasonals script into index.html.");
+                }
+                else
+                {
+                    _logger.LogWarning("Script already present in index.html. Or could not be injected.");
+                }
+            }
+        }
+        catch (UnauthorizedAccessException)
+        {
+            _logger.LogWarning("Unauthorized access when attempting to inject script into index.html. Automatic injection failed. Attempting fallback now...");
+            RegisterFileTransformation();
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error injecting Seasonals script. Attempting fallback.");
+            RegisterFileTransformation();
+        }
+    }
+
+    /// <summary>
+    /// Removes the script tag from index.html.
+    /// </summary>
+    public void Remove()
+    {
+        UnregisterFileTransformation();
+
+        try
+        {
+            var webPath = GetWebPath();
+            if (string.IsNullOrEmpty(webPath))
+            {
+                return;
+            }
+
+            var indexPath = Path.Combine(webPath, "index.html");
+            if (!File.Exists(indexPath))
+            {
+                return;
+            }
+
+            var content = File.ReadAllText(indexPath);
+            if (content.Contains(ScriptTag))
+            {
+                content = content.Replace(ScriptTag + Environment.NewLine, "").Replace(ScriptTag, "");
+                File.WriteAllText(indexPath, content);
+                _logger.LogInformation("Successfully removed Seasonals script from index.html.");
+            } else {
+                _logger.LogInformation("Seasonals script tag not found in index.html. No removal necessary.");
+            }
+        }
+        catch (UnauthorizedAccessException)
+        {
+            _logger.LogWarning("Unauthorized access when attempting to remove script from index.html.");
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "Error removing Seasonals script.");
+        }
+    }
+
+    /// <summary>
+    /// Retrieves the path to the Jellyfin web interface directory.
+    /// </summary>
+    /// <returns>The path to the web directory, or null if not found.</returns>
+    private string? GetWebPath()
+    {
+        // Use reflection to access WebPath property to ensure compatibility across different Jellyfin versions
+        var prop = _appPaths.GetType().GetProperty("WebPath", BindingFlags.Instance | BindingFlags.Public);
+        return prop?.GetValue(_appPaths) as string;
+    }
+
+    private void RegisterFileTransformation()
+    {
+        _logger.LogInformation("Seasonals Fallback. Registering file transformations.");
+        
+        List<JObject> payloads = new List<JObject>();
+
+        {
+            JObject payload = new JObject();
+            payload.Add("id", "ef1e863f-cbb0-4e47-9f23-f0cbb1826ad4"); 
+            payload.Add("fileNamePattern", "index.html");
+            payload.Add("callbackAssembly", GetType().Assembly.FullName);
+            payload.Add("callbackClass", typeof(TransformationPatches).FullName);
+            payload.Add("callbackMethod", nameof(TransformationPatches.IndexHtml));
+            
+            payloads.Add(payload);
+        }
+
+        Assembly? fileTransformationAssembly =
+            AssemblyLoadContext.All.SelectMany(x => x.Assemblies).FirstOrDefault(x =>
+                x.FullName?.Contains(".FileTransformation") ?? false);
+
+        if (fileTransformationAssembly != null)
+        {
+            Type? pluginInterfaceType = fileTransformationAssembly.GetType("Jellyfin.Plugin.FileTransformation.PluginInterface");
+
+            if (pluginInterfaceType != null)
+            {
+                foreach (JObject payload in payloads)
+                {
+                    pluginInterfaceType.GetMethod("RegisterTransformation")?.Invoke(null, new object?[] { payload });
+                }
+                _logger.LogInformation("File transformations registered successfully.");
+            }
+            else
+            {
+                _logger.LogWarning("FileTransformation plugin found but PluginInterface type missing.");
+            }
+        }
+        else
+        {
+                _logger.LogWarning("FileTransformation plugin assembly not found. Fallback injection skipped.");
+        }
+    }
+    
+    private void UnregisterFileTransformation()
+    {
+        try 
+        {
+            Assembly? fileTransformationAssembly =
+                AssemblyLoadContext.All.SelectMany(x => x.Assemblies).FirstOrDefault(x =>
+                    x.FullName?.Contains(".FileTransformation") ?? false);
+
+            if (fileTransformationAssembly != null)
+            {
+                Type? pluginInterfaceType = fileTransformationAssembly.GetType("Jellyfin.Plugin.FileTransformation.PluginInterface");
+
+                if (pluginInterfaceType != null)
+                {
+                    Guid id = Guid.Parse("ef1e863f-cbb0-4e47-9f23-f0cbb1826ad4");
+                    pluginInterfaceType.GetMethod("RemoveTransformation")?.Invoke(null, new object?[] { id });
+                    _logger.LogInformation("File transformation unregistered successfully.");
+                }
+            }
+        }
+        catch (Exception ex)
+        {
+            _logger.LogWarning(ex, "Error attempting to unregister file transformation. It might not have been registered.");
+        }
+    }
+}
\ No newline at end of file
diff --git a/Jellyfin.Plugin.Seasonals/ScriptInjector.cs b/Jellyfin.Plugin.Seasonals/ScriptInjector.cs
index bcfdb9a..f9f73a3 100644
--- a/Jellyfin.Plugin.Seasonals/ScriptInjector.cs
+++ b/Jellyfin.Plugin.Seasonals/ScriptInjector.cs
@@ -56,6 +56,18 @@ public class ScriptInjector
             }
 
             var content = File.ReadAllText(indexPath);
+
+
+            // MARK: Legacy Tags, remove in future versions
+            bool modified = false;
+            // Cleanup legacy tags first to avoid duplicates or conflicts
+            content = RemoveLegacyTags(content, ref modified);
+            if (modified)
+            {
+                _logger.LogInformation("Removed legacy tags from index.html.");
+            }
+
+
             if (!content.Contains(ScriptTag))
             {
                 var index = content.IndexOf(Marker, StringComparison.OrdinalIgnoreCase);
@@ -113,6 +125,17 @@ public class ScriptInjector
             } else {
                 _logger.LogInformation("Seasonals script tag not found in index.html. No removal necessary.");
             }
+
+            // MARK: Legacy Tags, remove in future versions
+            // Remove legacy tags
+            bool modified = false;
+            content = RemoveLegacyTags(content);
+            if (modified)
+            {
+                _logger.LogInformation("Removed legacy tags from index.html.");
+            }
+
+
         }
         catch (UnauthorizedAccessException)
         {
@@ -204,4 +227,22 @@ public class ScriptInjector
             _logger.LogWarning(ex, "Error attempting to unregister file transformation. It might not have been registered.");
         }
     }
+
+    // MARK: Legacy Tags, remove in future versions
+    /// <summary>
+    /// Removes legacy script and css tags from the content.
+    /// </summary>
+    private string RemoveLegacyTags(string content, ref bool modified)
+    {
+        // Legacy tags (used in versions prior to 1.6.3.0 where paths started with / instead of ../)
+        const string LegacyScriptTag = "<script src=\"/Seasonals/Resources/seasonals.js\" defer></script>";
+
+        if (content.Contains(LegacyScriptTag))
+        {
+            content = content.Replace(LegacyScriptTag + Environment.NewLine, "").Replace(LegacyScriptTag, "");
+            modified = true;
+            _logger.LogInformation("Legacy Seasonals script tag removed.");
+        }
+        return content;
+    }
 }
\ No newline at end of file