Refactor: Extract Bing image search logic

functions/_utils/bing.js

@@ -0,0 +1,29 @@
+export async function bingImageSearchFallback(query) {
+  try {
+    const res = await fetch(`https://www.bing.com/images/search?q=${encodeURIComponent(query)}&safesearch=moderate`, {
+      headers: { 
+        "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/114.0.0.0 Safari/537.36",
+        "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8"
+      }
+    });
+    if (!res.ok) return null;
+    const html = await res.text();
+    const urls = [];
+    
+    // Bing encodes the image payload inside HTML entity attributes and script tags
+    const regex1 = /"murl":"(https:[^&"]+)"/g;
+    const regex2 = /"murl":"(https:[^"]+)"/g;
+    
+    let match;
+    while ((match = regex1.exec(html)) !== null) {
+      urls.push(match[1].replace(/\\\//g, '/'));
+    }
+    while ((match = regex2.exec(html)) !== null) {
+      urls.push(match[1].replace(/\\\//g, '/'));
+    }
+    
+    return urls.length > 0 ? [...new Set(urls)] : null;
+  } catch (err) {
+    return null;
+  }
+}