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fix(core): fix DeepL error (#64) #65

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d3402db
fix(core): fix DeepL error (#64)
Transparent-fish Aug 29, 2026
37731a5
merge(main): resolve deepl.ts conflict, keep 429 fix with i18n
Transparent-fish Aug 29, 2026
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254 changes: 171 additions & 83 deletions apps/vscode-extension/src/tools/deepl.ts
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Original file line number Diff line number Diff line change
@@ -1,11 +1,21 @@
import * as https from "https";
import * as http from "http";
import * as stream from "stream";
import * as zlib from "zlib";
import { t } from "./i18n";

const MAX_ATTEMPTS = 3;
const RATE_LIMIT_MARKERS = ["slow down please", "page load error", "too many requests"];

let freeDeeplID = 1;

function sleep(ms: number): Promise<void> {
return new Promise((resolve) => setTimeout(resolve, ms));
}

function getDeepLTimestamp(text: string): number {
const ts = Date.now(), count = text.split('i').length;
if (count > 0) return ts - (ts % count) + count; //从油猴插件上搬的
if (count > 0) return ts - (ts % count) + count;
return ts;
}

Expand All @@ -16,6 +26,113 @@ function formatDeeplJson(date: object, id: number): string {
return json;
}

interface RawResponse {
statusCode?: number;
contentType?: string;
body: string;
}

function readResponse(res: http.IncomingMessage): Promise<string> {
const rawEncoding = res.headers["content-encoding"];
const encoding = Array.isArray(rawEncoding) ? rawEncoding.join(",") : (rawEncoding ?? "");
let readable: stream.Readable = res;
if (encoding.includes("br")) {
readable = res.pipe(zlib.createBrotliDecompress());
} else if (encoding.includes("gzip")) {
readable = res.pipe(zlib.createGunzip());
} else if (encoding.includes("deflate")) {
readable = res.pipe(zlib.createInflate());
}

return new Promise((resolve, reject) => {
const chunks: Buffer[] = [];
readable.on("data", (chunk: Buffer) => chunks.push(chunk));
readable.on("end", () => resolve(Buffer.concat(chunks).toString("utf8")));
readable.on("error", reject);
});
}

function requestDeepL(options: https.RequestOptions, postData: string): Promise<RawResponse> {
return new Promise((resolve, reject) => {
let settled = false;
const settle = (fn: () => void) => { if (!settled) { settled = true; fn(); } };

const req = https.request(options, (res) => {
readResponse(res).then(
(body) => settle(() => resolve({ statusCode: res.statusCode, contentType: res.headers["content-type"], body })),
(err) => settle(() => reject(err)),
);
});

req.setTimeout(20000, () => req.destroy(new Error(t("deepl.timeout"))));
req.on("error", (err: Error) => settle(() => reject(err)));
req.write(postData);
req.end();
});
}

async function requestWithRetry(options: https.RequestOptions, postData: string): Promise<RawResponse> {
let last: RawResponse = { statusCode: 429, body: "" };
for (let attempt = 1; attempt <= MAX_ATTEMPTS; attempt++) {
const res = await requestDeepL(options, postData);
last = res;
if (res.statusCode === 429 && attempt < MAX_ATTEMPTS) {
const delay = 1000 * 2 ** (attempt - 1);
console.log(`[deepl] 限流 429（第 ${attempt}/${MAX_ATTEMPTS} 次），${delay}ms 后重试`);
await sleep(delay);
continue;
}
return res;
}
return last;
}

function stripBom(text: string): string {
return text.charCodeAt(0) === 0xfeff ? text.slice(1) : text;
}

function parseTranslateJson(body: string): Record<string, unknown> | null {
try {
const json: unknown = JSON.parse(stripBom(body));
return json && typeof json === "object" ? (json as Record<string, unknown>) : null;
} catch {
return null;
}
}

function getPath(obj: unknown, path: string): unknown {
return path.split(".").reduce<unknown>((acc, key) => {
if (acc && typeof acc === "object" && key in (acc as Record<string, unknown>)) {
return (acc as Record<string, unknown>)[key];
}
return undefined;
}, obj);
}

function preview(body: string, max = 120): string {
return body.replace(/\s+/g, " ").substring(0, max);
}

function isRateLimitHtml(body: string): boolean {
const lower = body.toLowerCase();
return RATE_LIMIT_MARKERS.some((marker) => lower.includes(marker));
}

function logUnexpectedResponse(prefix: string, res: RawResponse): void {
console.log(`[deepl] ${prefix} status=${res.statusCode} type=${res.contentType} body=${preview(res.body, 200)}`);
}

function buildTranslateError(statusCode: number | undefined, body: string): Error {
if (statusCode === 429 || isRateLimitHtml(body)) {
return new Error(t("deepl.rateLimited"));
}
const json = parseTranslateJson(body);
if (json && typeof json.message === "string") {
return new Error(json.message);
}
return new Error(t("deepl.httpError", { status: statusCode ?? "?" }));
}

export async function translateTextFree(text: string, lang: string): Promise<string> {
const id = freeDeeplID++;
const postData = formatDeeplJson({
Expand All @@ -33,90 +150,61 @@ export async function translateTextFree(text: string, lang: string): Promise<str
},
}, id);

return new Promise((resolve, reject) => {
let settled = false;
const settle = (fn: () => void) => { if (!settled) { settled = true; fn(); } };

const req = https.request(
{
hostname: "www2.deepl.com",
path: "/jsonrpc",
method: "POST",
headers: {
"Content-Type": "application/json",
"Content-Length": Buffer.byteLength(postData),
"Host": "www2.deepl.com",
"Origin": "https://www.deepl.com",
"Referer": "https://www.deepl.com/",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36",
},
const res = await requestWithRetry(
{
hostname: "www2.deepl.com",
path: "/jsonrpc",
method: "POST",
headers: {
"Content-Type": "application/json",
"Content-Length": Buffer.byteLength(postData),
"Host": "www2.deepl.com",
"Origin": "https://www.deepl.com",
"Referer": "https://www.deepl.com/",
"User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36",
},
(res) => {
let data = "";
res.on("data", (chunk) => (data += chunk));
res.on("end", () => {
settle(() => {
if (res.statusCode && res.statusCode >= 400) {
reject(new Error(res.statusCode === 429 ? t("deepl.tooFrequent") : t("deepl.httpError", { status: res.statusCode })));
return;
}
try {
const json = JSON.parse(data);
if (json?.result?.texts?.[0]?.text) {
resolve(json.result.texts[0].text);
} else {
reject(new Error(t("deepl.badResponse")));
}
} catch {
reject(new Error(t("deepl.badResponse")));
}
});
});
}
);
},
postData,
);

req.setTimeout(20000, () => req.destroy(new Error(t("deepl.timeout"))));
req.on("error", (err: Error) =>
settle(() => reject(new Error(err.message === t("deepl.timeout") ? t("deepl.timeout") : t("deepl.failed", { msg: err.message }))))
);
req.write(postData);
req.end();
});
if (res.statusCode && res.statusCode >= 400) {
logUnexpectedResponse("免费翻译请求失败", res);
throw buildTranslateError(res.statusCode, res.body);
}
const json = parseTranslateJson(res.body);
const translated = json ? getPath(json, "result.texts.0.text") : undefined;
if (typeof translated === "string" && translated) {
return translated;
}
logUnexpectedResponse("免费翻译响应结构异常", res);
throw new Error(t("deepl.unexpectedStructure"));
}

export function translateTextRaw(text: string, targetLang: string, apiKey: string): Promise<string> {
return new Promise((resolve, reject) => {
const params = new URLSearchParams({ text, target_lang: targetLang });
const host = apiKey.endsWith(":fx") ? "api-free.deepl.com" : "api.deepl.com";
const req = https.request(
{
hostname: host,
path: "/v2/translate",
method: "POST",
headers: {
"Content-Type": "application/x-www-form-urlencoded",
Authorization: `DeepL-Auth-Key ${apiKey}`,
},
export async function translateTextRaw(text: string, targetLang: string, apiKey: string): Promise<string> {
const params = new URLSearchParams({ text, target_lang: targetLang });
const host = apiKey.endsWith(":fx") ? "api-free.deepl.com" : "api.deepl.com";
const res = await requestWithRetry(
{
hostname: host,
path: "/v2/translate",
method: "POST",
headers: {
"Content-Type": "application/x-www-form-urlencoded",
Authorization: `DeepL-Auth-Key ${apiKey}`,
},
(res) => {
let data = "";
res.on("data", (chunk) => (data += chunk));
res.on("end", () => {
try {
const json = JSON.parse(data);
if (res.statusCode && res.statusCode >= 400) {
reject(new Error(json.message || t("deepl.httpError", { status: res.statusCode })));
return;
}
resolve(json.translations?.[0]?.text ?? text);
} catch {
reject(new Error(t("deepl.badResponse")));
}
});
}
);
req.on("error", () => reject(new Error(t("deepl.failedSimple"))));
req.write(params.toString());
req.end();
});
}
},
params.toString(),
);

if (res.statusCode && res.statusCode >= 400) {
logUnexpectedResponse("API 请求失败", res);
throw buildTranslateError(res.statusCode, res.body);
}
const json = parseTranslateJson(res.body);
const translated = json ? getPath(json, "translations.0.text") : undefined;
if (typeof translated === "string") {
return translated;
}
logUnexpectedResponse("API 响应结构异常", res);
throw new Error(t("deepl.unexpectedStructure"));
}
2 changes: 2 additions & 0 deletions apps/vscode-extension/src/tools/i18n/en.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -86,8 +86,10 @@ export const en: Record<keyof ZhDict, string> = {
"err.network": "Network error: {msg}",

"deepl.tooFrequent": "Too many translation requests, please try again later",
"deepl.rateLimited": "DeepL translation is rate limited (HTTP 429), please try again later",
"deepl.httpError": "Translation API error ({status})",
"deepl.badResponse": "Translation API returned an unexpected response",
"deepl.unexpectedStructure": "Translation API returned an unrecognized response structure",
"deepl.timeout": "Translation request timed out",
"deepl.failed": "Translation request failed: {msg}",
"deepl.failedSimple": "Translation request failed",
Expand Down
2 changes: 2 additions & 0 deletions apps/vscode-extension/src/tools/i18n/zh.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -84,8 +84,10 @@ export const zh = {
"err.network": "网络错误: {msg}",

"deepl.tooFrequent": "翻译请求过于频繁，请稍后再试",
"deepl.rateLimited": "DeepL 翻译被限流（HTTP 429），请稍后再试",
"deepl.httpError": "翻译接口错误 ({status})",
"deepl.badResponse": "翻译接口返回异常",
"deepl.unexpectedStructure": "翻译接口返回异常：响应结构无法识别",
"deepl.timeout": "翻译请求超时",
"deepl.failed": "翻译请求失败: {msg}",
"deepl.failedSimple": "翻译请求失败",
Expand Down
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