Function handler

src/pages/api/chat.ts:16–166

(req: NextRequest)

};

const handler = async (req: NextRequest) => {
  const reqBody = await req.json();
  const apiKey = req.headers.get("x-openai-key") || openAIApiKey;

  if (!apiKey) {
    return new Response(
      JSON.stringify({
        error: {
          message: "OpenAI API Key is missing. You can supply your own key via [Setting](/setting).",
        },
      }),
      {
        headers: {
          "Content-Type": "application/json",
        },
        status: 401,
      }
    );
  }

  const useServerKey = !req.headers.get("x-openai-key");
  const sessionToken = req.cookies.get("next-auth.session-token")?.value;
  const currentUrl = new URL(req.url);
  const usageUrl = new URL(currentUrl.protocol + "//" + currentUrl.host + "/api/usage");
  const requestHeaders: any = {
    Authorization: `Bearer ${sessionToken}`,
  };
  if (req.headers.get("x-openai-model")) {
    // Pass model to usage API to calculate usage
    requestHeaders["x-openai-model"] = req.headers.get("x-openai-model");
  }

  if (useServerKey) {
    if (hasFeature("account") && !sessionToken) {
      return new Response(
        JSON.stringify({
          error: {
            message: "Please sign up to get free quota.",
          },
        }),
        {
          headers: {
            "Content-Type": "application/json",
          },
          status: 401,
        }
      );
    }

    if (hasFeature("quota")) {
      const usageRes = await fetch(usageUrl, {
        method: "GET",
        headers: requestHeaders,
      });
      if (!usageRes.ok) {
        return new Response(usageRes.body, {
          status: 500,
          statusText: usageRes.statusText,