402 lines
13 KiB
JavaScript
402 lines
13 KiB
JavaScript
export default {
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async fetch(request, env, ctx) {
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const url = new URL(request.url);
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const { pathname } = url;
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// API 的 CORS 预检请求
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if (request.method === "OPTIONS" && pathname.startsWith("/api/")) {
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return new Response(null, { headers: corsHeaders() });
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}
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// --- API：返回语言列表（常用） ---
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if (pathname === "/api/languages") {
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return jsonResponse({ languages: COMMON_LANGUAGES }, 200, corsHeaders());
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}
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// --- API：翻译 ---
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if (pathname === "/api/translate") {
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if (request.method !== "POST") {
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return jsonResponse(
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{ error: "Use POST /api/translate with JSON body." },
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405,
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corsHeaders()
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);
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}
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// 可选的 API Key 校验
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const apiKey = env.API_KEY;
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if (apiKey) {
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const got =
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request.headers.get("x-api-key") ||
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url.searchParams.get("key") ||
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"";
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if (got !== apiKey) {
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return jsonResponse({ error: "Unauthorized" }, 401, corsHeaders());
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}
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}
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let body;
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try {
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body = await request.json();
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} catch {
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return jsonResponse({ error: "Invalid JSON body." }, 400, corsHeaders());
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}
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const text = (body.text ?? "").toString();
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const target_lang = (body.target_lang ?? "").toString().trim();
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const source_lang_raw = (body.source_lang ?? "").toString().trim(); // 可选
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if (!text) return jsonResponse({ error: "text is required" }, 400, corsHeaders());
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if (!target_lang) return jsonResponse({ error: "target_lang is required" }, 400, corsHeaders());
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const page_size = clampInt(body.page_size ?? 1800, 200, 5000);
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const page = clampInt(body.page ?? 1, 1, 999999);
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const translate_all = Boolean(body.translate_all);
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const chunks = splitText(text, page_size);
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const total_pages = chunks.length;
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const safePage = clampInt(page, 1, total_pages);
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try {
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if (translate_all) {
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// 使用批量请求（Workers AI 在该模型上支持批量 schema）
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const requests = chunks.slice(0, 50).map((t) => ({
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text: t,
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...(source_lang_raw ? { source_lang: normalizeLang(source_lang_raw) } : {}),
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target_lang: normalizeLang(target_lang),
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}));
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const out = await env.AI.run("@cf/meta/m2m100-1.2b", { requests });
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// 某些绑定会返回类似数组的结果；这里做防御性归一化处理：
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const translated_pages = Array.isArray(out)
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? out.map((x) => x?.translated_text ?? "")
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: (out?.responses ?? out?.results ?? out?.translated_pages ?? null);
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// 兜底处理：如果返回结构不符合预期，就退回到单页翻译
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if (Array.isArray(translated_pages)) {
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return jsonResponse(
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{
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page: 1,
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page_size,
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total_pages,
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translated_pages,
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translated_text: translated_pages.join(""),
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truncated: chunks.length > 50,
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},
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200,
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corsHeaders()
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);
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}
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}
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// 默认：仅翻译单页
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const chunk = chunks[safePage - 1] ?? "";
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const out = await env.AI.run("@cf/meta/m2m100-1.2b", {
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text: chunk,
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...(source_lang_raw ? { source_lang: normalizeLang(source_lang_raw) } : {}),
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target_lang: normalizeLang(target_lang),
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});
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return jsonResponse(
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{
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page: safePage,
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page_size,
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total_pages,
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source_lang: source_lang_raw || "(default en)",
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target_lang,
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input_text: chunk,
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translated_text: out?.translated_text ?? "",
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},
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200,
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corsHeaders()
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);
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} catch (e) {
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return jsonResponse(
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{ error: "AI run failed", detail: String(e?.message || e) },
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500,
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corsHeaders()
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);
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}
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}
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// --- Web 界面 ---
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if (pathname === "/" || pathname === "/index.html") {
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if (request.method === "GET") {
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return new Response(renderPage({}), {
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headers: { "content-type": "text/html; charset=utf-8" },
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});
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}
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if (request.method === "POST") {
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const form = await request.formData();
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const text = (form.get("text") ?? "").toString();
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const source_lang = (form.get("source_lang") ?? "en").toString().trim();
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const target_lang = (form.get("target_lang") ?? "zh").toString().trim();
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const page_size = clampInt(form.get("page_size") ?? 1800, 200, 5000);
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const page = clampInt(form.get("page") ?? 1, 1, 999999);
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if (!text) {
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return new Response(renderPage({ error: "请输入要翻译的文本。", text, source_lang, target_lang, page_size, page }), {
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headers: { "content-type": "text/html; charset=utf-8" },
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});
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}
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const chunks = splitText(text, page_size);
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const total_pages = chunks.length;
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const safePage = clampInt(page, 1, total_pages);
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const chunk = chunks[safePage - 1] ?? "";
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let translated = "";
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let err = "";
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try {
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const out = await env.AI.run("@cf/meta/m2m100-1.2b", {
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text: chunk,
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source_lang: normalizeLang(source_lang),
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target_lang: normalizeLang(target_lang),
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});
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translated = out?.translated_text ?? "";
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} catch (e) {
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err = `翻译失败：${String(e?.message || e)}`;
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}
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return new Response(
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renderPage({
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text,
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source_lang,
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target_lang,
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page_size,
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page: safePage,
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total_pages,
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input_chunk: chunk,
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translated_text: translated,
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error: err,
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}),
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{ headers: { "content-type": "text/html; charset=utf-8" } }
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);
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}
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return new Response("Method Not Allowed", { status: 405 });
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}
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return new Response("Not Found", { status: 404 });
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},
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};
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// ---------------- 辅助函数 ----------------
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const COMMON_LANGUAGES = [
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{ code: "en", name: "English" },
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{ code: "zh", name: "中文" },
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{ code: "ja", name: "日本語" },
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{ code: "ko", name: "한국어" },
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{ code: "fr", name: "Français" },
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{ code: "de", name: "Deutsch" },
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{ code: "es", name: "Español" },
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{ code: "pt", name: "Português" },
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{ code: "it", name: "Italiano" },
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{ code: "ru", name: "Русский" },
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{ code: "ar", name: "العربية" },
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{ code: "hi", name: "हिन्दी" },
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{ code: "id", name: "Bahasa Indonesia" },
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{ code: "th", name: "ไทย" },
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{ code: "vi", name: "Tiếng Việt" },
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{ code: "tr", name: "Türkçe" },
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{ code: "nl", name: "Nederlands" },
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{ code: "sv", name: "Svenska" },
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{ code: "pl", name: "Polski" },
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{ code: "uk", name: "Українська" },
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];
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function normalizeLang(lang) {
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// 文档里写的是语言代码，例如 'en'/'es' 等。
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// 但有些示例会使用 english/french，这里也允许原样透传。
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return String(lang || "").trim().toLowerCase();
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}
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function clampInt(v, min, max) {
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const n = Number.parseInt(String(v), 10);
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if (!Number.isFinite(n)) return min;
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return Math.min(max, Math.max(min, n));
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}
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function splitText(text, maxChars) {
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const t = String(text || "");
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if (t.length <= maxChars) return [t];
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// 优先按段落拆分
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const parts = t.split(/\n{2,}/);
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const chunks = [];
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let buf = "";
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for (const p of parts) {
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const piece = (p + "\n\n");
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if (piece.length > maxChars) {
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// 对超长段落进行硬切分
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if (buf) {
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chunks.push(buf);
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buf = "";
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}
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for (let i = 0; i < piece.length; i += maxChars) {
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chunks.push(piece.slice(i, i + maxChars));
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}
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continue;
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}
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if (buf.length + piece.length > maxChars) {
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chunks.push(buf);
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buf = piece;
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} else {
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buf += piece;
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}
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}
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if (buf) chunks.push(buf);
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return chunks;
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}
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function escapeHtml(s) {
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return String(s || "")
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.replaceAll("&", "&")
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.replaceAll("<", "<")
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.replaceAll(">", ">")
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.replaceAll('"', """)
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.replaceAll("'", "'");
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}
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function renderPage(state) {
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const {
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text = "",
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source_lang = "en",
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target_lang = "zh",
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page_size = 1800,
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page = 1,
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total_pages = 1,
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input_chunk = "",
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translated_text = "",
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error = "",
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} = state || {};
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const langOptions = (selected) =>
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COMMON_LANGUAGES.map(
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(l) =>
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`<option value="${escapeHtml(l.code)}" ${
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l.code === selected ? "selected" : ""
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}>${escapeHtml(l.name)} (${escapeHtml(l.code)})</option>`
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).join("");
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const hasResult = Boolean(text);
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return `<!doctype html>
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<html lang="zh-CN">
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<head>
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<meta charset="utf-8" />
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<meta name="viewport" content="width=device-width, initial-scale=1" />
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<title>Workers AI 翻译</title>
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<style>
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body { font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial; margin: 24px; }
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.wrap { max-width: 1100px; margin: 0 auto; }
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textarea { width: 100%; min-height: 220px; padding: 12px; font-size: 14px; }
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pre { white-space: pre-wrap; word-break: break-word; background: #f6f7f9; padding: 12px; border-radius: 10px; }
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.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
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.card { border: 1px solid #e6e7ea; border-radius: 14px; padding: 14px; margin-top: 14px; }
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.btn { padding: 10px 14px; border-radius: 10px; border: 1px solid #d0d3d9; background: #fff; cursor: pointer; }
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.btn-primary { border-color: #111; }
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.muted { color: #666; font-size: 12px; }
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.err { color: #b00020; }
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input[type="number"], input[type="text"], select { padding: 8px 10px; border-radius: 10px; border: 1px solid #d0d3d9; }
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</style>
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</head>
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<body>
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<div class="wrap">
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<h2>Workers AI 翻译（m2m100-1.2b）</h2>
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<div class="muted">
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默认网页访问：英译中（en → zh）。语言参数遵循语言代码（如 en/zh/es…） :contentReference[oaicite:4]{index=4}
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</div>
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${error ? `<p class="err">${escapeHtml(error)}</p>` : ""}
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<form method="POST" action="/">
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<div class="card">
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<div class="row">
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<label>源语言：</label>
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<select name="source_lang">
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${langOptions(source_lang)}
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</select>
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<label>目标语言：</label>
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<select name="target_lang">
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${langOptions(target_lang)}
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</select>
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<label>每页字符数：</label>
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<input name="page_size" type="number" min="200" max="5000" value="${escapeHtml(page_size)}" />
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<input type="hidden" name="page" value="1" />
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<button class="btn btn-primary" type="submit">翻译（从第 1 页开始）</button>
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</div>
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<div style="margin-top: 10px;">
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<textarea name="text" placeholder="粘贴要翻译的文本…">${escapeHtml(text)}</textarea>
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</div>
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<div class="muted">提示：长文本会自动分页；翻页时只翻译当前页，响应更快。</div>
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</div>
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</form>
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${
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hasResult
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? `<div class="card">
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<div class="row" style="justify-content: space-between;">
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<div><b>第 ${page} / ${total_pages} 页</b></div>
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<div class="row">
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${page > 1 ? navForm("上一页", page - 1, text, source_lang, target_lang, page_size) : ""}
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${page < total_pages ? navForm("下一页", page + 1, text, source_lang, target_lang, page_size) : ""}
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</div>
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</div>
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<h3>原文（本页）</h3>
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<pre>${escapeHtml(input_chunk || "")}</pre>
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<h3>译文</h3>
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<pre>${escapeHtml(translated_text || "")}</pre>
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<div class="muted">
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API：POST /api/translate（JSON）｜GET /api/languages
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</div>
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</div>`
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: ""
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}
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</div>
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</body>
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</html>`;
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}
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function navForm(label, page, text, source_lang, target_lang, page_size) {
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return `<form method="POST" action="/" style="display:inline;">
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<input type="hidden" name="page" value="${escapeHtml(page)}" />
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<input type="hidden" name="source_lang" value="${escapeHtml(source_lang)}" />
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<input type="hidden" name="target_lang" value="${escapeHtml(target_lang)}" />
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<input type="hidden" name="page_size" value="${escapeHtml(page_size)}" />
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<input type="hidden" name="text" value="${escapeHtml(text)}" />
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<button class="btn" type="submit">${escapeHtml(label)}</button>
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</form>`;
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}
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function corsHeaders() {
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return {
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"Access-Control-Allow-Origin": "*",
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"Access-Control-Allow-Methods": "POST, GET, OPTIONS",
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"Access-Control-Allow-Headers": "Content-Type, X-API-Key",
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"Access-Control-Max-Age": "86400",
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};
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}
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function jsonResponse(obj, status = 200, extraHeaders = {}) {
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return new Response(JSON.stringify(obj, null, 2), {
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status,
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headers: {
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"content-type": "application/json; charset=utf-8",
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...extraHeaders,
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},
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});
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}
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