feat(clickTtHttpPageRoutes): add meta-refresh URL rewriting for proxy handling

- Implemented a new function to rewrite meta-refresh URLs in HTML, ensuring redirects after login are routed through the proxy while maintaining session integrity.
- Updated the proxy GET and POST endpoints to include the new meta-refresh handling, enhancing the overall functionality of the proxy interactions.
- Improved error handling in the new function to ensure robustness in processing HTML content.

backend/routes/clickTtHttpPageRoutes.js

@@ -85,6 +85,38 @@ function rewriteLinksInHtml(html, proxyBaseUrl, pageBaseUrl, sid) {
   }
 }
 
+/**
+ * Schreibt meta-refresh-URLs um, damit Redirects nach Login über unseren Proxy laufen (Session bleibt erhalten).
+ */
+function rewriteMetaRefreshInHtml(html, proxyBaseUrl, pageBaseUrl, sid) {
+  if (!html || !proxyBaseUrl || !pageBaseUrl || !sid) return html;
+  try {
+    const base = new URL(pageBaseUrl);
+    return html.replace(
+      /<meta\s[^>]*(?:http-equiv\s*=\s*["']refresh["'][^>]*content\s*=\s*["']([^"']+)["']|content\s*=\s*["']([^"']+)["'][^>]*http-equiv\s*=\s*["']refresh["'])[^>]*>/gi,
+      (match, content1, content2) => {
+        const content = content1 || content2;
+        if (!content) return match;
+        const urlMatch = content.match(/^\s*\d+\s*;\s*url\s*=\s*(.+)$/i);
+        if (!urlMatch) return match;
+        let targetUrl = urlMatch[1].trim();
+        if ((targetUrl.startsWith("'") && targetUrl.endsWith("'")) || (targetUrl.startsWith('"') && targetUrl.endsWith('"'))) {
+          targetUrl = targetUrl.slice(1, -1);
+        }
+        if (targetUrl.startsWith('/') || !targetUrl.startsWith('http')) {
+          targetUrl = new URL(targetUrl, base.origin + base.pathname).href;
+        }
+        if (!shouldProxyUrl(targetUrl)) return match;
+        const proxyUrl = buildProxyUrl(proxyBaseUrl, targetUrl, sid);
+        const newContent = content.replace(/url\s*=\s*.+$/i, `url=${proxyUrl}`);
+        return match.replace(content, newContent);
+      }
+    );
+  } catch {
+    return html;
+  }
+}
+
 /**
  * Schreibt Formular-Actions um, sodass Submissions über unseren Proxy laufen (Login etc. wird geloggt).
  */
@@ -198,6 +230,7 @@ router.get('/proxy', async (req, res, next) => {
     const proxyBase = baseUrl.replace(/\/$/, '') + '/api/clicktt/proxy';
     html = rewriteLinksInHtml(html, proxyBase, targetUrl, sid);
     html = rewriteFormActionsInHtml(html, proxyBase, targetUrl, sid);
+    html = rewriteMetaRefreshInHtml(html, proxyBase, targetUrl, sid);
 
     res.set({
       'Content-Type': 'text/html; charset=utf-8',
@@ -258,8 +291,14 @@ router.post('/proxy', async (req, res, next) => {
         }
         (Array.isArray(setCookies) ? setCookies : [setCookies]).forEach(c => res.append('Set-Cookie', c));
       }
-      const location = responseHeaders.get?.('location') ?? responseHeaders['location'];
+      let location = responseHeaders.get?.('location') ?? responseHeaders['location'];
       if (location && (result.status >= 301 && result.status <= 308)) {
+        if (location.startsWith('/')) {
+          try {
+            const base = new URL(targetUrl);
+            location = base.origin + location;
+          } catch { /* ignore */ }
+        }
         const baseUrl = process.env.BACKEND_BASE_URL || process.env.BASE_URL
           || `${req.protocol || 'http'}://${req.get('host') || 'localhost:' + (process.env.PORT || 3005)}`;
         const proxyBase = baseUrl.replace(/\/$/, '') + '/api/clicktt/proxy';
@@ -288,6 +327,7 @@ router.post('/proxy', async (req, res, next) => {
       }
       responseBody = rewriteLinksInHtml(responseBody, proxyBase, targetUrl, sid);
       responseBody = rewriteFormActionsInHtml(responseBody, proxyBase, targetUrl, sid);
+      responseBody = rewriteMetaRefreshInHtml(responseBody, proxyBase, targetUrl, sid);
     }
 
     res.set({

backend/services/clickTtHttpPageService.js

@@ -106,15 +106,24 @@ async function fetchWithLogging(options) {
   const baseDomain = extractBaseDomain(url);
   const startTime = Date.now();
 
+  let origin;
+  try { origin = new URL(url).origin + '/'; } catch { origin = 'https://httv.click-tt.de/'; }
   const headers = {
     'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36',
     'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
     'Accept-Language': 'de,en-US;q=0.7,en;q=0.3',
+    'Referer': origin,
+    'Origin': origin.replace(/\/$/, ''),
     ...customHeaders,
   };
 
   try {
-    const fetchOpts = { method, headers, timeout: 30000 };
+    const fetchOpts = {
+      method,
+      headers,
+      timeout: 30000,
+      redirect: method === 'POST' ? 'manual' : 'follow',
+    };
     if (body && (method === 'POST' || method === 'PUT')) {
       fetchOpts.body = body;
     }