fix: Decode HTML entities in chat responses and improve n8n error handling

- Add HTML entity decoding for chat responses (fixes ' display issue)
- Add timeout handling for n8n webhook requests (30s chat, 10s status)
- Improve error logging with detailed error information
- Add N8N_SECRET_TOKEN support for authentication
- Better fallback handling when n8n is unavailable
- Fix server-side HTML entity decoding for chat and status endpoints

app/api/n8n/chat/route.ts

@@ -1,4 +1,5 @@
 import { NextRequest, NextResponse } from "next/server";
+import { decodeHtmlEntitiesServer } from "@/lib/html-decode";
 
 export async function POST(request: NextRequest) {
   let userMessage = "";
@@ -36,29 +37,43 @@ export async function POST(request: NextRequest) {
       });
     }
 
-    console.log(`Sending to n8n: ${n8nWebhookUrl}/webhook/chat`);
+    const webhookUrl = `${n8nWebhookUrl}/webhook/chat`;
+    console.log(`Sending to n8n: ${webhookUrl}`);
 
-    const response = await fetch(`${n8nWebhookUrl}/webhook/chat`, {
-      method: "POST",
-      headers: {
-        "Content-Type": "application/json",
-        ...(process.env.N8N_API_KEY && {
-          Authorization: `Bearer ${process.env.N8N_API_KEY}`,
+    // Add timeout to prevent hanging requests
+    const controller = new AbortController();
+    const timeoutId = setTimeout(() => controller.abort(), 30000); // 30 second timeout
+
+    try {
+      const response = await fetch(webhookUrl, {
+        method: "POST",
+        headers: {
+          "Content-Type": "application/json",
+          ...(process.env.N8N_SECRET_TOKEN && {
+            Authorization: `Bearer ${process.env.N8N_SECRET_TOKEN}`,
+          }),
+          ...(process.env.N8N_API_KEY && {
+            "X-API-Key": process.env.N8N_API_KEY,
+          }),
+        },
+        body: JSON.stringify({
+          message: userMessage,
+          history: history,
         }),
-      },
-      body: JSON.stringify({
-        message: userMessage,
-        history: history,
-      }),
-    });
-    if (!response.ok) {
-      console.error(`n8n webhook failed with status: ${response.status}`);
-      throw new Error(`n8n webhook failed: ${response.status}`);
-    }
+        signal: controller.signal,
+      });
 
-    const data = await response.json();
+      clearTimeout(timeoutId);
 
-    console.log("n8n response data:", data);
+      if (!response.ok) {
+        const errorText = await response.text().catch(() => 'Unknown error');
+        console.error(`n8n webhook failed with status: ${response.status}`, errorText);
+        throw new Error(`n8n webhook failed: ${response.status} - ${errorText}`);
+      }
+
+      const data = await response.json();
+
+      console.log("n8n response data:", data);
 
     const reply =
       data.reply ||
@@ -77,17 +92,41 @@ export async function POST(request: NextRequest) {
       if (data && typeof data === "object" && Object.keys(data).length > 0) {
         // It returned something, but we don't know what field to use.
         // Check for common n8n structure
-        if (data.output) return NextResponse.json({ reply: data.output });
-        if (data.data) return NextResponse.json({ reply: data.data });
+        if (data.output) {
+          const decoded = decodeHtmlEntitiesServer(String(data.output));
+          return NextResponse.json({ reply: decoded });
+        }
+        if (data.data) {
+          const decoded = decodeHtmlEntitiesServer(String(data.data));
+          return NextResponse.json({ reply: decoded });
+        }
       }
       throw new Error("Invalid response format from n8n");
     }
 
-    return NextResponse.json({
-      reply: reply,
-    });
-  } catch (error) {
+      // Decode HTML entities in the reply
+      const decodedReply = decodeHtmlEntitiesServer(String(reply));
+
+      return NextResponse.json({
+        reply: decodedReply,
+      });
+    } catch (fetchError: unknown) {
+      clearTimeout(timeoutId);
+      
+      if (fetchError instanceof Error && fetchError.name === 'AbortError') {
+        console.error("n8n webhook request timed out");
+      } else {
+        console.error("n8n webhook fetch error:", fetchError);
+      }
+      throw fetchError;
+    }
+  } catch (error: unknown) {
     console.error("Chat API error:", error);
+    console.error("Error details:", {
+      message: error instanceof Error ? error.message : String(error),
+      stack: error instanceof Error ? error.stack : undefined,
+      n8nUrl: process.env.N8N_WEBHOOK_URL ? 'configured' : 'missing',
+    });
 
     // Fallback to mock responses
     // Now using the variable captured at the start

app/api/n8n/status/route.ts

@@ -20,6 +20,7 @@ export async function GET(request: NextRequest) {
     const n8nWebhookUrl = process.env.N8N_WEBHOOK_URL;
     
     if (!n8nWebhookUrl) {
+      console.warn("N8N_WEBHOOK_URL not configured for status endpoint");
       // Return fallback if n8n is not configured
       return NextResponse.json({
         status: { text: "offline", color: "gray" },
@@ -31,42 +32,70 @@ export async function GET(request: NextRequest) {
 
     // Rufe den n8n Webhook auf
     // Add timestamp to query to bypass Cloudflare cache
-    const res = await fetch(
-      `${n8nWebhookUrl}/webhook/denshooter-71242/status?t=${Date.now()}`,
-      {
+    const statusUrl = `${n8nWebhookUrl}/webhook/denshooter-71242/status?t=${Date.now()}`;
+    console.log(`Fetching status from: ${statusUrl}`);
+
+    // Add timeout to prevent hanging requests
+    const controller = new AbortController();
+    const timeoutId = setTimeout(() => controller.abort(), 10000); // 10 second timeout
+
+    try {
+      const res = await fetch(statusUrl, {
         method: "GET",
         headers: {
           "Content-Type": "application/json",
+          ...(process.env.N8N_SECRET_TOKEN && {
+            Authorization: `Bearer ${process.env.N8N_SECRET_TOKEN}`,
+          }),
         },
         next: { revalidate: 30 },
-      },
-    );
+        signal: controller.signal,
+      });
 
-    if (!res.ok) {
-      throw new Error(`n8n error: ${res.status}`);
+      clearTimeout(timeoutId);
+
+      if (!res.ok) {
+        const errorText = await res.text().catch(() => 'Unknown error');
+        console.error(`n8n status webhook failed: ${res.status}`, errorText);
+        throw new Error(`n8n error: ${res.status} - ${errorText}`);
+      }
+
+      const data = await res.json();
+
+      // n8n gibt oft ein Array zurück: [{...}]. Wir wollen nur das Objekt.
+      const statusData = Array.isArray(data) ? data[0] : data;
+
+      // Safety check: if statusData is still undefined/null (e.g. empty array), use fallback
+      if (!statusData) {
+        throw new Error("Empty data received from n8n");
+      }
+
+      // Ensure coding object has proper structure
+      if (statusData.coding && typeof statusData.coding === "object") {
+        // Already properly formatted from n8n
+      } else if (statusData.coding === null || statusData.coding === undefined) {
+        // No coding data - keep as null
+        statusData.coding = null;
+      }
+
+      return NextResponse.json(statusData);
+    } catch (fetchError: unknown) {
+      clearTimeout(timeoutId);
+      
+      if (fetchError instanceof Error && fetchError.name === 'AbortError') {
+        console.error("n8n status webhook request timed out");
+      } else {
+        console.error("n8n status webhook fetch error:", fetchError);
+      }
+      throw fetchError;
     }
-
-    const data = await res.json();
-
-    // n8n gibt oft ein Array zurück: [{...}]. Wir wollen nur das Objekt.
-    const statusData = Array.isArray(data) ? data[0] : data;
-
-    // Safety check: if statusData is still undefined/null (e.g. empty array), use fallback
-    if (!statusData) {
-      throw new Error("Empty data received from n8n");
-    }
-
-    // Ensure coding object has proper structure
-    if (statusData.coding && typeof statusData.coding === "object") {
-      // Already properly formatted from n8n
-    } else if (statusData.coding === null || statusData.coding === undefined) {
-      // No coding data - keep as null
-      statusData.coding = null;
-    }
-
-    return NextResponse.json(statusData);
-  } catch (error) {
+  } catch (error: unknown) {
     console.error("Error fetching n8n status:", error);
+    console.error("Error details:", {
+      message: error instanceof Error ? error.message : String(error),
+      stack: error instanceof Error ? error.stack : undefined,
+      n8nUrl: process.env.N8N_WEBHOOK_URL ? 'configured' : 'missing',
+    });
     // Leeres Fallback-Objekt, damit die Seite nicht abstürzt
     return NextResponse.json({
       status: { text: "offline", color: "gray" },