37 lines
1.3 KiB
TypeScript
37 lines
1.3 KiB
TypeScript
import { createHmac } from "crypto";
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import dayjs from "dayjs";
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import { NextApiRequest, NextApiResponse } from "next";
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import { stringify } from "querystring";
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import getAppKeysFromSlug from "../../_utils/getAppKeysFromSlug";
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let signingSecret = "";
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export default async function slackVerify(req: NextApiRequest, res: NextApiResponse) {
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const body = req.body;
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const timeStamp = req.headers["x-slack-request-timestamp"] as string; // Always returns a string and not a string[]
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const slackSignature = req.headers["x-slack-signature"] as string;
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const currentTime = dayjs().unix();
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let { signing_secret } = await getAppKeysFromSlug("slack");
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if (typeof signing_secret === "string") signingSecret = signing_secret;
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if (!timeStamp) {
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return res.status(400).json({ message: "Missing X-Slack-Request-Timestamp header" });
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}
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if (!signingSecret) {
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return res.status(400).json({ message: "Missing Slack's signing_secret" });
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}
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if (Math.abs(currentTime - parseInt(timeStamp)) > 60 * 5) {
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return res.status(400).json({ message: "Request is too old" });
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}
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const signature_base = `v0:${timeStamp}:${stringify(body)}`;
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const signed_sig = "v0=" + createHmac("sha256", signingSecret).update(signature_base).digest("hex");
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if (signed_sig !== slackSignature) {
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return res.status(400).json({ message: "Invalid signature" });
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}
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}
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