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function isValidHmacSignature(signature: string, data: Buffer, secret: string) {
return signature === crypto.createHmac('sha256', secret).update(data).digest('hex')
}
export interface IsValidWebhookSignatureParams {
/**
* The value of the "fpjs-event-signature" header.
* */
header: string
/**
* The raw data of the incoming request
* */
data: Buffer
/**
* The secret key used to sign the request.
* */
secret: string
}
/**
* Verifies the HMAC signature extracted from the "fpjs-event-signature" header of the incoming request. This is a part of the webhook signing process, which is available only for enterprise customers.
* If you wish to enable it, please contact our support: https://fingerprint.com/support
*
* @param {IsValidWebhookSignatureParams} params
* @param {string} params.header - The value of the "fpjs-event-signature" header.
* @param {Buffer} params.data - The raw data of the incoming request.
* @param {string} params.secret - The secret key used to sign the request.
*
* @return {boolean} true if the signature is valid, false otherwise.
*
* @example
* ```javascript
* // Webhook endpoint handler
* export async function POST(request: Request) {
* try {
* const secret = process.env.WEBHOOK_SIGNATURE_SECRET;
* const header = request.headers.get("fpjs-event-signature");
* const data = Buffer.from(await request.arrayBuffer());
*
* if (!isValidWebhookSignature({ header, data, secret })) {
* return Response.json(
* { message: "Webhook signature is invalid." },
* { status: 403 },
* );
* }
*
* return Response.json({ message: "Webhook received." });
* } catch (error) {
* return Response.json({ error }, { status: 500 });
* }
* }
* ```
*/
export function isValidWebhookSignature(params: IsValidWebhookSignatureParams): boolean {
const { header, data, secret } = params
const signatures = header.split(',')
for (const signature of signatures) {
const [version, hash] = signature.split('=')
if (version === 'v1' && isValidHmacSignature(hash, data, secret)) {
return true
}
}
return false
}
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