Function POST

docs/app/api/demo/github/stream/route.ts:48–112

(req: NextRequest)

// ── Route handler ──────────────────────────────────────────────────────────

export async function POST(req: NextRequest) {
  const { prompt, messages } = await req.json();

  const systemPrompt = getPrompt();

  const chatMessages: Array<{ role: string; content: string }> = [
    { role: "system", content: systemPrompt },
  ];
  if (messages && Array.isArray(messages)) {
    for (const m of messages) {
      chatMessages.push({ role: m.role, content: m.content });
    }
  }
  chatMessages.push({ role: "user", content: prompt });

  const apiKey = process.env.OPENROUTER_API_KEY;
  if (!apiKey) {
    return Response.json(
      { error: { message: "OPENROUTER_API_KEY not configured" } },
      { status: 500 },
    );
  }

  const res = await fetch("https://openrouter.ai/api/v1/chat/completions", {
    method: "POST",
    headers: {
      Authorization: `Bearer ${apiKey}`,
      "Content-Type": "application/json",
      "HTTP-Referer": `${BASE_URL}/demo/github`,
      "X-Title": "OpenUI GitHub Demo",
    },
    body: JSON.stringify({
      model: GITHUB_DEMO_MODEL,
      stream: true,
      messages: chatMessages,
    }),
    signal: req.signal,
  });

  if (!res.ok) {
    const err = await res.json().catch(() => ({}));
    if (isDemoCreditsExhaustedError(err, res.status)) {
      return createDemoCreditsExhaustedResponse();
    }

    return Response.json(
      {
        error: (err as { error?: { message?: string } }).error ?? {
          message: `OpenRouter error ${res.status}`,
        },
      },
      { status: res.status },
    );
  }

  // Keep credit handling to provider 4xx responses. Provider-specific mid-stream
  // error chunks are intentionally passed through because they are harder to
  // maintain across OpenRouter/OpenAI streaming shape changes.