feat(clickTtHttpPageRoutes): add sensitive data masking and form body summarization

- Introduced functions to mask sensitive values in form submissions and summarize form body data, enhancing security and logging capabilities.
- Updated the proxy POST route to log detailed information about submitted forms, including field counts and redacted values for sensitive keys.
- Enhanced error handling for URL-encoded body parsing, improving robustness in form data processing.

backend/routes/clickTtHttpPageRoutes.js

@@ -56,6 +56,41 @@ function serializeFormBody(req) {
   return null;
 }
 
+function maskSensitiveValue(key, value) {
+  if (!key) return value;
+  return /(pass|password|passwd|pwd|token|secret)/i.test(String(key)) ? '[redacted]' : value;
+}
+
+function summarizeFormBody(body) {
+  if (!body || typeof body !== 'string') {
+    return { fieldCount: 0, fields: [] };
+  }
+
+  try {
+    const params = new URLSearchParams(body);
+    const fields = [];
+
+    for (const [key, value] of params.entries()) {
+      fields.push({
+        key,
+        value: maskSensitiveValue(key, value),
+      });
+    }
+
+    return {
+      fieldCount: fields.length,
+      fields,
+      parseError: null,
+    };
+  } catch {
+    return {
+      fieldCount: 0,
+      fields: [],
+      parseError: 'body is not URL-encoded',
+    };
+  }
+}
+
 /** Domains, deren Links durch den Proxy umgeleitet werden (für Folge-Logs) */
 const PROXY_DOMAINS = ['click-tt.de', 'httv.de', 'liga.nu'];
 
@@ -287,6 +322,7 @@ function injectProxyNavigationScript(html, proxyBaseUrl, pageBaseUrl, sid) {
     'if(!anchor||event.defaultPrevented)return;',
     "var targetUrl=normalizeUrl(anchor.getAttribute('href'),PAGE_BASE_URL);",
     'if(!targetUrl||!shouldProxyUrl(targetUrl))return;',
+    "try{console.log('[ClickTT Proxy] anchor click',{href:anchor.getAttribute('href'),targetUrl:targetUrl,text:(anchor.textContent||'').trim().slice(0,120)});}catch(e){}",
     'event.preventDefault();',
     'navigateViaProxy(targetUrl);',
     '},false);',
@@ -296,6 +332,17 @@ function injectProxyNavigationScript(html, proxyBaseUrl, pageBaseUrl, sid) {
     'var submitter=event.submitter||null;',
     'var targetUrl=getSubmitTarget(form,submitter);',
     'if(!targetUrl||!shouldProxyUrl(targetUrl))return;',
+    'try{',
+    'var formDataEntries=[];',
+    'if(window.FormData){',
+    'var formData=new FormData(form);',
+    'formData.forEach(function(value,key){',
+    "var safeValue=/(pass|password|passwd|pwd|token|secret)/i.test(String(key))?'[redacted]':String(value);",
+    'formDataEntries.push({key:key,value:safeValue});',
+    '});',
+    '}',
+    "console.log('[ClickTT Proxy] form submit',{action:form.getAttribute('action'),targetUrl:targetUrl,submitterName:submitter&&submitter.name?submitter.name:null,submitterValue:submitter&&submitter.value?submitter.value:null,fieldCount:formDataEntries.length,fields:formDataEntries.slice(0,40)});",
+    '}catch(e){}',
     "form.setAttribute('action',buildProxyUrl(targetUrl));",
     '},true);',
     'if(window.fetch){',
@@ -321,6 +368,7 @@ function injectProxyNavigationScript(html, proxyBaseUrl, pageBaseUrl, sid) {
     'var nativeSubmit=window.HTMLFormElement.prototype.submit;',
     'window.HTMLFormElement.prototype.submit=function patchedSubmit(){',
     'var targetUrl=getSubmitTarget(this,null);',
+    'try{console.log("[ClickTT Proxy] direct form.submit()",{action:this.getAttribute("action"),targetUrl:targetUrl});}catch(e){}',
     "if(targetUrl&&shouldProxyUrl(targetUrl)){this.setAttribute('action',buildProxyUrl(targetUrl));}",
     'return nativeSubmit.apply(this,arguments);',
     '};',
@@ -469,6 +517,16 @@ router.post('/proxy', async (req, res, next) => {
 
     const contentType = req.get('content-type') || 'application/x-www-form-urlencoded';
     const body = serializeFormBody(req);
+    const bodySummary = summarizeFormBody(body);
+
+    console.log('[ClickTT Proxy POST]', JSON.stringify({
+      sid,
+      targetUrl,
+      contentType,
+      fieldCount: bodySummary.fieldCount,
+      fields: bodySummary.fields,
+      parseError: bodySummary.parseError,
+    }));
 
     const result = await clickTtHttpPageService.fetchWithLogging({
       url: targetUrl,
@@ -658,10 +716,9 @@ router.get('/fetch', authenticate, async (req, res, next) => {
       return res.status(400).json({ error: 'url ist erforderlich' });
     }
 
-    // Nur click-tt.de und httv.de erlauben
-    if (!url.includes('click-tt.de') && !url.includes('httv.de')) {
+    if (!isAllowedProxyUrl(url)) {
       return res.status(400).json({
-        error: 'Nur URLs von click-tt.de oder httv.de sind erlaubt',
+        error: 'Nur URLs von click-tt.de, httv.de oder liga.nu sind erlaubt',
       });
     }