mirror of
https://github.com/CJackHwang/ds2api.git
synced 2026-05-02 07:25:26 +08:00
771 lines
21 KiB
JavaScript
771 lines
21 KiB
JavaScript
'use strict';
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const {
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extractToolNames,
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createToolSieveState,
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processToolSieveChunk,
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flushToolSieve,
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parseToolCalls,
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formatOpenAIStreamToolCalls,
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} = require('./helpers/stream-tool-sieve');
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const DEEPSEEK_COMPLETION_URL = 'https://chat.deepseek.com/api/v0/chat/completion';
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const BASE_HEADERS = {
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Host: 'chat.deepseek.com',
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'User-Agent': 'DeepSeek/1.6.11 Android/35',
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Accept: 'application/json',
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'Content-Type': 'application/json',
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'x-client-platform': 'android',
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'x-client-version': '1.6.11',
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'x-client-locale': 'zh_CN',
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'accept-charset': 'UTF-8',
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};
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const SKIP_PATTERNS = [
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'quasi_status',
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'elapsed_secs',
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'token_usage',
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'pending_fragment',
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'conversation_mode',
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'fragments/-1/status',
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'fragments/-2/status',
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'fragments/-3/status',
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];
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module.exports = async function handler(req, res) {
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setCorsHeaders(res);
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if (req.method === 'OPTIONS') {
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res.statusCode = 204;
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res.end();
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return;
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}
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if (req.method !== 'POST') {
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writeOpenAIError(res, 405, 'method not allowed');
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return;
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}
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const rawBody = await readRawBody(req);
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// Hard guard: only use Node data path for streaming on Vercel runtime.
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// Any non-Vercel runtime always falls back to Go for full behavior parity.
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if (!isVercelRuntime()) {
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await proxyToGo(req, res, rawBody);
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return;
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}
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let payload;
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try {
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payload = JSON.parse(rawBody.toString('utf8') || '{}');
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} catch (_err) {
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writeOpenAIError(res, 400, 'invalid json');
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return;
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}
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// Keep all non-stream behavior on Go side to avoid compatibility regressions.
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if (!toBool(payload.stream)) {
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await proxyToGo(req, res, rawBody);
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return;
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}
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const prep = await fetchStreamPrepare(req, rawBody);
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if (!prep.ok) {
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relayPreparedFailure(res, prep);
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return;
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}
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const model = asString(prep.body.model) || asString(payload.model);
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const sessionID = asString(prep.body.session_id) || `chatcmpl-${Date.now()}`;
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const leaseID = asString(prep.body.lease_id);
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const deepseekToken = asString(prep.body.deepseek_token);
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const powHeader = asString(prep.body.pow_header);
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const completionPayload = prep.body.payload && typeof prep.body.payload === 'object' ? prep.body.payload : null;
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const finalPrompt = asString(prep.body.final_prompt);
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const thinkingEnabled = toBool(prep.body.thinking_enabled);
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const searchEnabled = toBool(prep.body.search_enabled);
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const toolNames = extractToolNames(payload.tools);
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if (!model || !leaseID || !deepseekToken || !powHeader || !completionPayload) {
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writeOpenAIError(res, 500, 'invalid vercel prepare response');
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return;
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}
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const releaseLease = createLeaseReleaser(req, leaseID);
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try {
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const completionRes = await fetch(DEEPSEEK_COMPLETION_URL, {
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method: 'POST',
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headers: {
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...BASE_HEADERS,
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authorization: `Bearer ${deepseekToken}`,
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'x-ds-pow-response': powHeader,
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},
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body: JSON.stringify(completionPayload),
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});
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if (!completionRes.ok || !completionRes.body) {
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const detail = await safeReadText(completionRes);
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writeOpenAIError(res, 500, detail ? `Failed to get completion: ${detail}` : 'Failed to get completion.');
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return;
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}
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res.statusCode = 200;
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res.setHeader('Content-Type', 'text/event-stream');
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res.setHeader('Cache-Control', 'no-cache, no-transform');
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res.setHeader('Connection', 'keep-alive');
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res.setHeader('X-Accel-Buffering', 'no');
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if (typeof res.flushHeaders === 'function') {
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res.flushHeaders();
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}
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const created = Math.floor(Date.now() / 1000);
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let firstChunkSent = false;
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let currentType = thinkingEnabled ? 'thinking' : 'text';
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let thinkingText = '';
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let outputText = '';
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const toolSieveEnabled = toolNames.length > 0;
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const toolSieveState = createToolSieveState();
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let toolCallsEmitted = false;
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const decoder = new TextDecoder();
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const reader = completionRes.body.getReader();
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let buffered = '';
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let ended = false;
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const sendFrame = (obj) => {
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res.write(`data: ${JSON.stringify(obj)}\n\n`);
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if (typeof res.flush === 'function') {
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res.flush();
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}
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};
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const sendDeltaFrame = (delta) => {
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const payloadDelta = { ...delta };
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if (!firstChunkSent) {
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payloadDelta.role = 'assistant';
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firstChunkSent = true;
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}
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sendFrame({
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id: sessionID,
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object: 'chat.completion.chunk',
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created,
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model,
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choices: [{ delta: payloadDelta, index: 0 }],
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});
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};
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const finish = async (reason) => {
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if (ended) {
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return;
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}
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ended = true;
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const detected = parseToolCalls(outputText, toolNames);
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if (detected.length > 0 && !toolCallsEmitted) {
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toolCallsEmitted = true;
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sendDeltaFrame({ tool_calls: formatOpenAIStreamToolCalls(detected) });
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} else if (toolSieveEnabled) {
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const tailEvents = flushToolSieve(toolSieveState, toolNames);
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for (const evt of tailEvents) {
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if (evt.text) {
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sendDeltaFrame({ content: evt.text });
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}
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}
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}
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if (detected.length > 0 || toolCallsEmitted) {
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reason = 'tool_calls';
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}
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sendFrame({
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id: sessionID,
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object: 'chat.completion.chunk',
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created,
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model,
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choices: [{ delta: {}, index: 0, finish_reason: reason }],
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usage: buildUsage(finalPrompt, thinkingText, outputText),
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});
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res.write('data: [DONE]\n\n');
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await releaseLease();
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res.end();
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};
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try {
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// eslint-disable-next-line no-constant-condition
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while (true) {
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const { value, done } = await reader.read();
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if (done) {
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break;
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}
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buffered += decoder.decode(value, { stream: true });
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const lines = buffered.split('\n');
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buffered = lines.pop() || '';
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for (const rawLine of lines) {
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const line = rawLine.trim();
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if (!line.startsWith('data:')) {
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continue;
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}
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const dataStr = line.slice(5).trim();
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if (!dataStr) {
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continue;
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}
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if (dataStr === '[DONE]') {
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await finish('stop');
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return;
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}
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let chunk;
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try {
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chunk = JSON.parse(dataStr);
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} catch (_err) {
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continue;
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}
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if (chunk.error || chunk.code === 'content_filter') {
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await finish('content_filter');
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return;
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}
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const parsed = parseChunkForContent(chunk, thinkingEnabled, currentType);
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currentType = parsed.newType;
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if (parsed.finished) {
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await finish('stop');
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return;
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}
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for (const p of parsed.parts) {
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if (!p.text) {
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continue;
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}
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if (searchEnabled && isCitation(p.text)) {
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continue;
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}
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if (p.type === 'thinking') {
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if (thinkingEnabled) {
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thinkingText += p.text;
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sendDeltaFrame({ reasoning_content: p.text });
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}
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} else {
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outputText += p.text;
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if (!toolSieveEnabled) {
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sendDeltaFrame({ content: p.text });
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continue;
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}
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const events = processToolSieveChunk(toolSieveState, p.text, toolNames);
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for (const evt of events) {
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if (evt.type === 'tool_calls') {
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toolCallsEmitted = true;
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sendDeltaFrame({ tool_calls: formatOpenAIStreamToolCalls(evt.calls) });
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continue;
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}
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if (evt.text) {
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sendDeltaFrame({ content: evt.text });
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}
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}
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}
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}
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}
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}
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await finish('stop');
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} catch (_err) {
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await finish('stop');
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}
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} finally {
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await releaseLease();
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}
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};
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function setCorsHeaders(res) {
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res.setHeader('Access-Control-Allow-Origin', '*');
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res.setHeader('Access-Control-Allow-Methods', 'GET, POST, OPTIONS, PUT, DELETE');
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res.setHeader(
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'Access-Control-Allow-Headers',
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'Content-Type, Authorization, X-API-Key, X-Ds2-Target-Account, X-Vercel-Protection-Bypass',
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);
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}
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function header(req, key) {
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if (!req || !req.headers) {
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return '';
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}
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return asString(req.headers[key.toLowerCase()]);
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}
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async function readRawBody(req) {
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if (Buffer.isBuffer(req.body)) {
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return req.body;
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}
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if (typeof req.body === 'string') {
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return Buffer.from(req.body);
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}
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if (req.body && typeof req.body === 'object') {
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return Buffer.from(JSON.stringify(req.body));
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}
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const chunks = [];
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for await (const chunk of req) {
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chunks.push(Buffer.isBuffer(chunk) ? chunk : Buffer.from(chunk));
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}
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return Buffer.concat(chunks);
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}
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async function fetchStreamPrepare(req, rawBody) {
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const url = buildInternalGoURL(req);
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url.searchParams.set('__stream_prepare', '1');
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const upstream = await fetch(url.toString(), {
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method: 'POST',
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headers: buildInternalGoHeaders(req, { withInternalToken: true, withContentType: true }),
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body: rawBody,
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});
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const text = await upstream.text();
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let body = {};
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try {
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body = JSON.parse(text || '{}');
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} catch (_err) {
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body = {};
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}
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return {
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ok: upstream.ok,
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status: upstream.status,
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contentType: upstream.headers.get('content-type') || 'application/json',
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text,
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body,
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};
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}
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function relayPreparedFailure(res, prep) {
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if (prep.status === 401 && looksLikeVercelAuthPage(prep.text)) {
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writeOpenAIError(
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res,
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401,
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'Vercel Deployment Protection blocked internal prepare request. Disable protection for this deployment or set VERCEL_AUTOMATION_BYPASS_SECRET.',
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);
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return;
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}
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res.statusCode = prep.status || 500;
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res.setHeader('Content-Type', prep.contentType || 'application/json');
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if (prep.text) {
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res.end(prep.text);
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return;
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}
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writeOpenAIError(res, prep.status || 500, 'vercel prepare failed');
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}
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async function safeReadText(resp) {
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if (!resp) {
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return '';
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}
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try {
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const text = await resp.text();
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return text.trim();
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} catch (_err) {
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return '';
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}
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}
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function internalSecret() {
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return asString(process.env.DS2API_VERCEL_INTERNAL_SECRET) || asString(process.env.DS2API_ADMIN_KEY) || 'admin';
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}
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function buildInternalGoURL(req) {
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const proto = asString(header(req, 'x-forwarded-proto')) || 'https';
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const host = asString(header(req, 'host'));
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const url = new URL(`${proto}://${host}${req.url || '/v1/chat/completions'}`);
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url.searchParams.set('__go', '1');
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const protectionBypass = resolveProtectionBypass(req);
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if (protectionBypass) {
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url.searchParams.set('x-vercel-protection-bypass', protectionBypass);
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}
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return url;
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}
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function buildInternalGoHeaders(req, opts = {}) {
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const headers = {
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authorization: asString(header(req, 'authorization')),
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'x-api-key': asString(header(req, 'x-api-key')),
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'x-ds2-target-account': asString(header(req, 'x-ds2-target-account')),
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'x-vercel-protection-bypass': resolveProtectionBypass(req),
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};
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if (opts.withInternalToken) {
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headers['x-ds2-internal-token'] = internalSecret();
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}
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if (opts.withContentType) {
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headers['content-type'] = asString(header(req, 'content-type')) || 'application/json';
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}
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return headers;
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}
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function createLeaseReleaser(req, leaseID) {
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let released = false;
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return async () => {
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if (released || !leaseID) {
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return;
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}
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released = true;
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try {
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await releaseStreamLease(req, leaseID);
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} catch (_err) {
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// Ignore release errors. Lease TTL cleanup on Go side still prevents permanent leaks.
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}
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};
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}
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async function releaseStreamLease(req, leaseID) {
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const url = buildInternalGoURL(req);
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url.searchParams.set('__stream_release', '1');
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const body = Buffer.from(JSON.stringify({ lease_id: leaseID }));
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const controller = new AbortController();
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const timeout = setTimeout(() => controller.abort(), 1500);
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try {
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await fetch(url.toString(), {
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method: 'POST',
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headers: buildInternalGoHeaders(req, { withInternalToken: true, withContentType: true }),
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body,
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signal: controller.signal,
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});
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} finally {
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clearTimeout(timeout);
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}
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}
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function resolveProtectionBypass(req) {
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const fromHeader = asString(header(req, 'x-vercel-protection-bypass'));
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if (fromHeader) {
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return fromHeader;
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}
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return asString(process.env.VERCEL_AUTOMATION_BYPASS_SECRET) || asString(process.env.DS2API_VERCEL_PROTECTION_BYPASS);
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}
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function looksLikeVercelAuthPage(text) {
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const body = asString(text).toLowerCase();
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if (!body) {
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return false;
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}
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return body.includes('authentication required') && body.includes('vercel');
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}
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function parseChunkForContent(chunk, thinkingEnabled, currentType) {
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if (!chunk || typeof chunk !== 'object' || !Object.prototype.hasOwnProperty.call(chunk, 'v')) {
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return { parts: [], finished: false, newType: currentType };
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}
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const pathValue = asString(chunk.p);
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if (shouldSkipPath(pathValue)) {
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return { parts: [], finished: false, newType: currentType };
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}
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if (pathValue === 'response/status' && asString(chunk.v) === 'FINISHED') {
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return { parts: [], finished: true, newType: currentType };
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}
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let newType = currentType;
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const parts = [];
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if (pathValue === 'response/fragments' && asString(chunk.o).toUpperCase() === 'APPEND' && Array.isArray(chunk.v)) {
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for (const frag of chunk.v) {
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if (!frag || typeof frag !== 'object') {
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continue;
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}
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const fragType = asString(frag.type).toUpperCase();
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const content = asString(frag.content);
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if (!content) {
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continue;
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}
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if (fragType === 'THINK' || fragType === 'THINKING') {
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newType = 'thinking';
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parts.push({ text: content, type: 'thinking' });
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} else if (fragType === 'RESPONSE') {
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newType = 'text';
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parts.push({ text: content, type: 'text' });
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} else {
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parts.push({ text: content, type: 'text' });
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}
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}
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}
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if (pathValue === 'response' && Array.isArray(chunk.v)) {
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for (const item of chunk.v) {
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if (!item || typeof item !== 'object') {
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continue;
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}
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if (item.p === 'fragments' && item.o === 'APPEND' && Array.isArray(item.v)) {
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for (const frag of item.v) {
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const fragType = asString(frag && frag.type).toUpperCase();
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if (fragType === 'THINK' || fragType === 'THINKING') {
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newType = 'thinking';
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} else if (fragType === 'RESPONSE') {
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newType = 'text';
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}
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}
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}
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}
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}
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let partType = 'text';
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if (pathValue === 'response/thinking_content') {
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partType = 'thinking';
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} else if (pathValue === 'response/content') {
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partType = 'text';
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} else if (pathValue.includes('response/fragments') && pathValue.includes('/content')) {
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partType = newType;
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} else if (!pathValue && thinkingEnabled) {
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partType = newType;
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}
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const val = chunk.v;
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if (typeof val === 'string') {
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if (val === 'FINISHED' && (!pathValue || pathValue === 'status')) {
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return { parts: [], finished: true, newType };
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}
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if (val) {
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parts.push({ text: val, type: partType });
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}
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return { parts, finished: false, newType };
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}
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if (Array.isArray(val)) {
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const extracted = extractContentRecursive(val, partType);
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if (extracted.finished) {
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return { parts: [], finished: true, newType };
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}
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parts.push(...extracted.parts);
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return { parts, finished: false, newType };
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}
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if (val && typeof val === 'object') {
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const resp = val.response && typeof val.response === 'object' ? val.response : val;
|
|
if (Array.isArray(resp.fragments)) {
|
|
for (const frag of resp.fragments) {
|
|
if (!frag || typeof frag !== 'object') {
|
|
continue;
|
|
}
|
|
const content = asString(frag.content);
|
|
if (!content) {
|
|
continue;
|
|
}
|
|
const t = asString(frag.type).toUpperCase();
|
|
if (t === 'THINK' || t === 'THINKING') {
|
|
newType = 'thinking';
|
|
parts.push({ text: content, type: 'thinking' });
|
|
} else if (t === 'RESPONSE') {
|
|
newType = 'text';
|
|
parts.push({ text: content, type: 'text' });
|
|
} else {
|
|
parts.push({ text: content, type: partType });
|
|
}
|
|
}
|
|
}
|
|
}
|
|
return { parts, finished: false, newType };
|
|
}
|
|
|
|
function extractContentRecursive(items, defaultType) {
|
|
const parts = [];
|
|
for (const it of items) {
|
|
if (!it || typeof it !== 'object') {
|
|
continue;
|
|
}
|
|
if (!Object.prototype.hasOwnProperty.call(it, 'v')) {
|
|
continue;
|
|
}
|
|
const itemPath = asString(it.p);
|
|
const itemV = it.v;
|
|
if (itemPath === 'status' && asString(itemV) === 'FINISHED') {
|
|
return { parts: [], finished: true };
|
|
}
|
|
if (shouldSkipPath(itemPath)) {
|
|
continue;
|
|
}
|
|
const content = asString(it.content);
|
|
if (content) {
|
|
const typeName = asString(it.type).toUpperCase();
|
|
if (typeName === 'THINK' || typeName === 'THINKING') {
|
|
parts.push({ text: content, type: 'thinking' });
|
|
} else if (typeName === 'RESPONSE') {
|
|
parts.push({ text: content, type: 'text' });
|
|
} else {
|
|
parts.push({ text: content, type: defaultType });
|
|
}
|
|
continue;
|
|
}
|
|
|
|
let partType = defaultType;
|
|
if (itemPath.includes('thinking')) {
|
|
partType = 'thinking';
|
|
} else if (itemPath.includes('content') || itemPath === 'response' || itemPath === 'fragments') {
|
|
partType = 'text';
|
|
}
|
|
|
|
if (typeof itemV === 'string') {
|
|
if (itemV && itemV !== 'FINISHED') {
|
|
parts.push({ text: itemV, type: partType });
|
|
}
|
|
continue;
|
|
}
|
|
|
|
if (!Array.isArray(itemV)) {
|
|
continue;
|
|
}
|
|
for (const inner of itemV) {
|
|
if (typeof inner === 'string') {
|
|
if (inner) {
|
|
parts.push({ text: inner, type: partType });
|
|
}
|
|
continue;
|
|
}
|
|
if (!inner || typeof inner !== 'object') {
|
|
continue;
|
|
}
|
|
const ct = asString(inner.content);
|
|
if (!ct) {
|
|
continue;
|
|
}
|
|
const typeName = asString(inner.type).toUpperCase();
|
|
if (typeName === 'THINK' || typeName === 'THINKING') {
|
|
parts.push({ text: ct, type: 'thinking' });
|
|
} else if (typeName === 'RESPONSE') {
|
|
parts.push({ text: ct, type: 'text' });
|
|
} else {
|
|
parts.push({ text: ct, type: partType });
|
|
}
|
|
}
|
|
}
|
|
return { parts, finished: false };
|
|
}
|
|
|
|
function shouldSkipPath(pathValue) {
|
|
if (pathValue === 'response/search_status') {
|
|
return true;
|
|
}
|
|
for (const p of SKIP_PATTERNS) {
|
|
if (pathValue.includes(p)) {
|
|
return true;
|
|
}
|
|
}
|
|
return false;
|
|
}
|
|
|
|
function isCitation(text) {
|
|
return asString(text).trim().startsWith('[citation:');
|
|
}
|
|
|
|
function buildUsage(prompt, thinking, output) {
|
|
const promptTokens = estimateTokens(prompt);
|
|
const reasoningTokens = estimateTokens(thinking);
|
|
const completionTokens = estimateTokens(output);
|
|
return {
|
|
prompt_tokens: promptTokens,
|
|
completion_tokens: reasoningTokens + completionTokens,
|
|
total_tokens: promptTokens + reasoningTokens + completionTokens,
|
|
completion_tokens_details: {
|
|
reasoning_tokens: reasoningTokens,
|
|
},
|
|
};
|
|
}
|
|
|
|
function estimateTokens(text) {
|
|
const t = asString(text);
|
|
if (!t) {
|
|
return 0;
|
|
}
|
|
const n = Math.floor(Array.from(t).length / 4);
|
|
return n < 1 ? 1 : n;
|
|
}
|
|
|
|
async function proxyToGo(req, res, rawBody) {
|
|
const url = buildInternalGoURL(req);
|
|
|
|
const upstream = await fetch(url.toString(), {
|
|
method: 'POST',
|
|
headers: buildInternalGoHeaders(req, { withContentType: true }),
|
|
body: rawBody,
|
|
});
|
|
|
|
res.statusCode = upstream.status;
|
|
upstream.headers.forEach((value, key) => {
|
|
if (key.toLowerCase() === 'content-length') {
|
|
return;
|
|
}
|
|
res.setHeader(key, value);
|
|
});
|
|
|
|
if (!upstream.body || typeof upstream.body.getReader !== 'function') {
|
|
const bytes = Buffer.from(await upstream.arrayBuffer());
|
|
res.end(bytes);
|
|
return;
|
|
}
|
|
|
|
const reader = upstream.body.getReader();
|
|
try {
|
|
// eslint-disable-next-line no-constant-condition
|
|
while (true) {
|
|
const { value, done } = await reader.read();
|
|
if (done) {
|
|
break;
|
|
}
|
|
if (value && value.length > 0) {
|
|
res.write(Buffer.from(value));
|
|
if (typeof res.flush === 'function') {
|
|
res.flush();
|
|
}
|
|
}
|
|
}
|
|
res.end();
|
|
} catch (_err) {
|
|
if (!res.writableEnded) {
|
|
res.end();
|
|
}
|
|
}
|
|
}
|
|
|
|
function writeOpenAIError(res, status, message) {
|
|
res.statusCode = status;
|
|
res.setHeader('Content-Type', 'application/json');
|
|
res.end(
|
|
JSON.stringify({
|
|
error: {
|
|
message,
|
|
type: openAIErrorType(status),
|
|
},
|
|
}),
|
|
);
|
|
}
|
|
|
|
function openAIErrorType(status) {
|
|
switch (status) {
|
|
case 400:
|
|
return 'invalid_request_error';
|
|
case 401:
|
|
return 'authentication_error';
|
|
case 403:
|
|
return 'permission_error';
|
|
case 429:
|
|
return 'rate_limit_error';
|
|
case 503:
|
|
return 'service_unavailable_error';
|
|
default:
|
|
return status >= 500 ? 'api_error' : 'invalid_request_error';
|
|
}
|
|
}
|
|
|
|
function toBool(v) {
|
|
return v === true;
|
|
}
|
|
|
|
function isVercelRuntime() {
|
|
return asString(process.env.VERCEL) !== '' || asString(process.env.NOW_REGION) !== '';
|
|
}
|
|
|
|
function asString(v) {
|
|
if (typeof v === 'string') {
|
|
return v.trim();
|
|
}
|
|
if (Array.isArray(v)) {
|
|
return asString(v[0]);
|
|
}
|
|
if (v == null) {
|
|
return '';
|
|
}
|
|
return String(v).trim();
|
|
}
|
|
|
|
module.exports.__test = {
|
|
parseChunkForContent,
|
|
extractContentRecursive,
|
|
shouldSkipPath,
|
|
asString,
|
|
};
|