Bridge: fetch stable URL from MokoOnyx updates.xml, fix double-exec

- Remove hardcoded RELEASE_URL, discover from updates.xml stable channel
- Add discoverStableUrl() to parse MokoOnyx updates.xml at runtime
- Extract httpGet() helper for reuse across download + XML fetch
- Remove bridge call from update() — postflight() handles it
- Always targets stable channel for production-safe installs

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/helper/bridge.php

@@ -28,8 +28,11 @@ class MokoBridgeMigration
     private const OLD_DISPLAY = 'MokoCassiopeia';
     private const NEW_DISPLAY = 'MokoOnyx';
 
-    /** URL to the latest MokoOnyx stable release ZIP */
-    private const RELEASE_URL = 'https://git.mokoconsulting.tech/MokoConsulting/MokoOnyx/releases/download/v01/mokoonyx-01.00.00.zip';
+    /** Raw URL for MokoOnyx updates.xml on main — used to discover the stable download URL */
+    private const UPDATES_XML_URL = 'https://git.mokoconsulting.tech/MokoConsulting/MokoOnyx/raw/branch/main/updates.xml';
+
+    /** Fallback URL if updates.xml cannot be parsed */
+    private const FALLBACK_URL = 'https://git.mokoconsulting.tech/MokoConsulting/MokoOnyx/releases/download/v01/mokoonyx-01.00.00.zip';
 
     /**
      * Run the full migration.
@@ -85,15 +88,94 @@ class MokoBridgeMigration
 
     /**
      * Download the MokoOnyx ZIP to Joomla's tmp directory.
+     *
+     * Reads MokoOnyx's updates.xml on main to discover the current stable
+     * download URL, falling back to a hardcoded URL if parsing fails.
      */
     private static function downloadRelease(): ?string
     {
         $tmpDir = Factory::getApplication()->get('tmp_path', JPATH_ROOT . '/tmp');
         $zipPath = $tmpDir . '/mokoonyx-install.zip';
 
+        // 1. Discover the stable download URL from MokoOnyx's updates.xml
+        $releaseUrl = self::discoverStableUrl();
+        if (!$releaseUrl) {
+            self::log('Bridge: could not discover release URL from updates.xml, using fallback');
+            $releaseUrl = self::FALLBACK_URL;
+        }
+
+        self::log('Bridge: downloading MokoOnyx from ' . $releaseUrl);
+
+        // 2. Download the ZIP
+        $content = self::httpGet($releaseUrl);
+
+        if ($content === false || strlen($content) < 1000) {
+            self::log('Bridge: failed to download MokoOnyx ZIP from ' . $releaseUrl, 'error');
+            return null;
+        }
+
+        if (file_put_contents($zipPath, $content) === false) {
+            self::log('Bridge: failed to write ZIP to ' . $zipPath, 'error');
+            return null;
+        }
+
+        self::log('Bridge: downloaded MokoOnyx ZIP (' . strlen($content) . ' bytes)');
+        return $zipPath;
+    }
+
+    /**
+     * Fetch MokoOnyx's updates.xml and extract the stable channel ZIP URL.
+     *
+     * Always targets the stable channel — the bridge should only install
+     * production-ready builds of MokoOnyx.
+     */
+    private static function discoverStableUrl(): ?string
+    {
+        $xml = self::httpGet(self::UPDATES_XML_URL);
+        if ($xml === false || strlen($xml) < 100) {
+            self::log('Bridge: failed to fetch MokoOnyx updates.xml', 'warning');
+            return null;
+        }
+
+        libxml_use_internal_errors(true);
+        $doc = simplexml_load_string($xml);
+        libxml_clear_errors();
+
+        if (!$doc) {
+            self::log('Bridge: failed to parse MokoOnyx updates.xml', 'warning');
+            return null;
+        }
+
+        // Find the stable <update> block
+        foreach ($doc->update as $update) {
+            $tags = $update->tags->tag ?? [];
+            foreach ($tags as $tag) {
+                if ((string) $tag === 'stable') {
+                    foreach ($update->downloads->downloadurl as $dl) {
+                        $format = (string) ($dl['format'] ?? '');
+                        $url = trim((string) $dl);
+                        if ($format === 'zip' && !empty($url)) {
+                            self::log('Bridge: discovered stable URL: ' . $url);
+                            return $url;
+                        }
+                    }
+                }
+            }
+        }
+
+        self::log('Bridge: no stable ZIP URL found in MokoOnyx updates.xml', 'warning');
+        return null;
+    }
+
+    /**
+     * HTTP GET helper — tries file_get_contents then cURL.
+     *
+     * @return string|false  Response body or false on failure.
+     */
+    private static function httpGet(string $url)
+    {
         $content = false;
 
-        // Method 1: file_get_contents
         if (ini_get('allow_url_fopen')) {
             $ctx = stream_context_create([
                 'http' => [
@@ -106,12 +188,11 @@ class MokoBridgeMigration
                     'verify_peer_name' => true,
                 ],
             ]);
-            $content = @file_get_contents(self::RELEASE_URL, false, $ctx);
+            $content = @file_get_contents($url, false, $ctx);
         }
 
-        // Method 2: cURL
         if ($content === false && function_exists('curl_init')) {
-            $ch = curl_init(self::RELEASE_URL);
+            $ch = curl_init($url);
             curl_setopt_array($ch, [
                 CURLOPT_RETURNTRANSFER => true,
                 CURLOPT_FOLLOWLOCATION => true,
@@ -128,18 +209,7 @@ class MokoBridgeMigration
             }
         }
 
-        if ($content === false || strlen($content) < 1000) {
-            self::log('Bridge: failed to download MokoOnyx ZIP from ' . self::RELEASE_URL, 'error');
-            return null;
-        }
-
-        if (file_put_contents($zipPath, $content) === false) {
-            self::log('Bridge: failed to write ZIP to ' . $zipPath, 'error');
-            return null;
-        }
-
-        self::log('Bridge: downloaded MokoOnyx ZIP (' . strlen($content) . ' bytes)');
-        return $zipPath;
+        return $content;
     }
 
     /**

src/script.php

@@ -113,15 +113,7 @@ class Tpl_MokocassiopeiaInstallerScript
             );
         }
 
-        // Bridge migration: MokoCassiopeia → MokoOnyx
-        $bridgeScript = __DIR__ . '/helper/bridge.php';
-        if (is_file($bridgeScript)) {
-            require_once $bridgeScript;
-            if (class_exists('MokoBridgeMigration')) {
-                MokoBridgeMigration::run();
-            }
-        }
-
+        // Bridge migration runs in postflight() — not here — to avoid double execution
         return true;
     }