tlsigning

truelayer-signing

Go package to produce & verify TrueLayer API requests signatures.

// `Tl-Signature` value to send with the request.
signature, err := tlsigning.SignWithPem(Kid, privateKeyBytes).
        Method("POST").
        Path("/payouts").
        Header("Idempotency-Key", idempotencyKey).
        Body(body).
        Sign()

See full example.

Verifying webhooks

The VerifyWithJwks function can be used to verify webhook Tl-Signature header signatures.

// `jku` field is included in webhook signatures
jwsHeader, err := tlsigning.ExtractJwsHeader(webhookSignature)
if err != nil {
  // Handle error
}

// check `jku` is an allowed TrueLayer url & fetch jwks JSON (not provided by this lib)
if !jkuAllowed(jwsHeader.Jku) {
  // Handle error
}
jwks := fetchJwks(jwsHeader.Jku)

// jwks may be used directly to verify a signature
err = tlsigning.VerifyWithJwks(jwks).
        Method("POST").
        Path(path).
        Headers(allWebhookHeaders).
        Body(body).
        Verify(webhookSignature)

Installation

Install the package with:

go get github.com/Truelayer/truelayer-signing/go

See webhook server example.