feat: initial bot implementation

src/search.js

@@ -0,0 +1,72 @@
+import { load as loadHtml } from 'cheerio';
+
+const cache = new Map();
+const CACHE_TTL_MS = 10 * 60 * 1000; // 10 minutes
+
+function makeCacheKey(query) {
+  return query.trim().toLowerCase();
+}
+
+function setCache(query, data) {
+  const key = makeCacheKey(query);
+  cache.set(key, { data, expires: Date.now() + CACHE_TTL_MS });
+}
+
+function getCache(query) {
+  const key = makeCacheKey(query);
+  const cached = cache.get(key);
+  if (!cached) return null;
+  if (Date.now() > cached.expires) {
+    cache.delete(key);
+    return null;
+  }
+  return cached.data;
+}
+
+function sanitizeText(text) {
+  if (!text) return '';
+  return text.replace(/\s+/g, ' ').trim();
+}
+
+function absoluteUrl(href) {
+  if (!href) return '';
+  if (href.startsWith('http')) return href;
+  return `https://duckduckgo.com${href}`;
+}
+
+export async function searchWeb(query, limit = 3) {
+  if (!query?.trim()) return [];
+  const cached = getCache(query);
+  if (cached) return cached;
+
+  const params = new URLSearchParams({ q: query, kl: 'us-en' });
+  const response = await fetch(`https://duckduckgo.com/html/?${params.toString()}`, {
+    headers: {
+      'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0 Safari/537.36',
+      Accept: 'text/html',
+    },
+  });
+
+  if (!response.ok) {
+    console.warn(`[search] DuckDuckGo request failed with status ${response.status}`);
+    return [];
+  }
+
+  const html = await response.text();
+  const $ = loadHtml(html);
+  const results = [];
+
+  $('.result').each((_, el) => {
+    if (results.length >= limit) return false;
+    const title = sanitizeText($(el).find('.result__title').text());
+    const href = absoluteUrl($(el).find('.result__url').attr('href'));
+    const snippet = sanitizeText($(el).find('.result__snippet').text());
+    if (title && href) {
+      results.push({ title, url: href, snippet });
+    }
+    return undefined;
+  });
+
+  setCache(query, results);
+  return results;
+}