fraiseql-server 2.0.0-alpha.1

HTTP server for FraiseQL v2 GraphQL engine
Documentation 
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//! Lemon Squeezy webhook signature verification.
//!
//! Format: Base64 encoded HMAC-SHA256

use base64::{Engine as _, engine::general_purpose};
use hmac::{Hmac, Mac};
use sha2::Sha256;

use crate::webhooks::{
    signature::{SignatureError, constant_time_eq},
    traits::SignatureVerifier,
};

pub struct LemonSqueezyVerifier;

impl SignatureVerifier for LemonSqueezyVerifier {
    fn name(&self) -> &'static str {
        "lemonsqueezy"
    }

    fn signature_header(&self) -> &'static str {
        "X-Signature"
    }

    fn verify(
        &self,
        payload: &[u8],
        signature: &str,
        secret: &str,
        _timestamp: Option<&str>,
    ) -> Result<bool, SignatureError> {
        let mut mac = Hmac::<Sha256>::new_from_slice(secret.as_bytes())
            .map_err(|e| SignatureError::Crypto(e.to_string()))?;
        mac.update(payload);

        let expected = general_purpose::STANDARD.encode(mac.finalize().into_bytes());

        Ok(constant_time_eq(signature.as_bytes(), expected.as_bytes()))
    }
}