Add script injector

1 files changed, 74 insertions, 0 deletions

diff --git a/Api/ScriptInjector.cs b/Api/ScriptInjector.cs
new file mode 100644
index 0000000..d6b1865
--- /dev/null
+++ b/Api/ScriptInjector.cs
@@ -0,0 +1,74 @@
+namespace Jellyfin.Plugin.JCoverXtremePro.Api;
+
+using System;
+using System.IO;
+using System.Text.RegularExpressions;
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Controller.Configuration;
+using Microsoft.Extensions.Logging;
+
+/// <summary>
+/// Utility for injecting a JavaScript script tag into the Jellyfin web frontend.
+/// </summary>
+public static class ScriptInjector
+{
+    public static void PerformInjection(
+        IApplicationPaths applicationPaths,
+        IServerConfigurationManager configurationManager
+    )
+    {
+        var indexHtmlFilePath = Path.Combine(applicationPaths.WebPath, "index.html");
+        if (!File.Exists(indexHtmlFilePath))
+        {
+            Plugin.Logger.LogWarning("Could not find index html file");
+            return;
+        }
+
+        var html = File.ReadAllText(indexHtmlFilePath);
+        var snippet = GetInjectedSnippet(GetHTTPBasePath(configurationManager));
+        if (html.Contains(snippet, StringComparison.InvariantCulture))
+        {
+            Plugin.Logger.LogInformation("Not injecting existing HTML snippet.");
+            return;
+        }
+
+        html = Regex.Replace(html, $"<script[^>]*guid=\"{Plugin.GUID}\"[^>]*></script>", string.Empty);
+        var bodyEnd = html.LastIndexOf("</body>", StringComparison.InvariantCulture);
+        if (bodyEnd < 0)
+        {
+            Plugin.Logger.LogError("Could not find end of body to inject script");
+            return;
+        }
+
+        html = html.Insert(bodyEnd, snippet);
+        try
+        {
+            File.WriteAllText(indexHtmlFilePath, html);
+            Plugin.Logger.LogInformation("Injected index.html");
+        }
+        catch (Exception e)
+        {
+            Plugin.Logger.LogError(e, "Failed to write patched index.html");
+        }
+    }
+
+    public static string GetHTTPBasePath(IServerConfigurationManager configurationManager)
+    {
+        var networkConfig = configurationManager.GetConfiguration("network");
+        var configType = networkConfig.GetType();
+        var baseUrlField = configType.GetProperty("BaseUrl");
+        var baseUrl = baseUrlField!.GetValue(networkConfig)!.ToString()!.Trim('/');
+        return baseUrl;
+    }
+
+    public static string GetScriptUrl(string basePath)
+    {
+        return basePath + "/JCoverXtremeProStatic/ClientScript";
+    }
+
+    public static string GetInjectedSnippet(string basePath)
+    {
+        return
+            $"<script guid=\"{Plugin.GUID}\" plugin=\"{Plugin.Instance!.Name}\" src=\"{GetScriptUrl(basePath)}\" defer></script>";
+    }
+}
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