import { JSDOM } from "jsdom";
import type { ProviderInterface, SearchItem, ProviderName } from "../types/provider.js";
import { HTTP_TIMEOUT } from "../constants.js";
import { fetchWithTimeout } from "../utils/http.js";
import { getRandomUserAgent, getAcceptLanguageHeader } from "../utils/user-agent.js";
import { searchCache, createCacheKey } from "../utils/cache.js";
export class DuckDuckGoProvider implements ProviderInterface {
name: ProviderName = "duckduckgo";
private decodeDuckDuckGoRedirect(href: string): string {
try {
const u = new URL(href, "https://duckduckgo.com/");
if (u.hostname === "duckduckgo.com" && u.pathname.startsWith("/l/")) {
const real = u.searchParams.get("uddg");
if (real) return decodeURIComponent(real);
}
return u.toString();
} catch {
return href;
}
}
async search(q: string, limit: number, lang: string): Promise<SearchItem[]> {
const cacheKey = createCacheKey("ddg", q, limit, lang);
const cached = searchCache.get(cacheKey) as SearchItem[] | undefined;
if (cached) return cached;
const url = new URL("https://html.duckduckgo.com/html/");
url.searchParams.set("q", q);
const headers = {
"User-Agent": getRandomUserAgent(),
...getAcceptLanguageHeader(lang)
};
const res = await fetchWithTimeout(url, { headers }, HTTP_TIMEOUT);
if (!res.ok) throw new Error(`DuckDuckGo HTML ${res.status}`);
const html = await res.text();
const dom = new JSDOM(html, { url: "https://duckduckgo.com/?q=" + encodeURIComponent(q) });
const doc = dom.window.document;
const anchors = Array.from(doc.querySelectorAll("a.result__a"));
const snippets = Array.from(doc.querySelectorAll(".result__snippet"));
const items: SearchItem[] = [];
for (let i = 0; i < anchors.length && items.length < limit; i++) {
const a = anchors[i] as HTMLAnchorElement;
const title = (a.textContent || "").trim();
const href = this.decodeDuckDuckGoRedirect(a.getAttribute("href") || "");
if (!title || !href) continue;
const sn = (snippets[i]?.textContent || "").trim() || undefined;
try {
const u = new URL(href);
items.push({ title, url: u.toString(), snippet: sn, source: "duckduckgo" });
} catch {}
}
searchCache.set(cacheKey, items);
return items;
}
async isAvailable(): Promise<boolean> {
return true;
}
}
