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To ensure that the webhook requests are genuinely from Magna and have not been tampered with, Magna uses HMAC signatures. Each request sent to your webhook endpoint includes a signature in the x-magna-signature header.

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Signature Generation

Magna generates the signature using the following process:
  1. Serialize the Request Body: The JSON payload is stringified.
  2. Create HMAC Hash: An HMAC SHA1 hash is created using the generated secret.
  3. Format the Signature: The final signature is prefixed with sha1= followed by the hexadecimal representation of the hash.

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Verifying Signatures

To verify the integrity and authenticity of the incoming webhook requests, you must calculate the signature on your end and compare it with the x-magna-signature header provided in the request.

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TypeScript Signature Calculation

import crypto from 'crypto';

/**
 * Calculates the HMAC SHA1 signature for the given request body.
 * @param body - The request payload received from Magna.
 * @param secret - The secret generated by Magna for this webhook.
 * @returns The formatted signature string.
 */
function calculateSignature(body: unknown, secret: string): string {
    const hmac = crypto.createHmac('sha1', secret);
    hmac.update(JSON.stringify(body));
    return `sha1=${hmac.digest('hex')}`;
}