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use shared::prometheus::{Counter, HistogramVec, labels, opts, register_counter, register_histogram_vec};
use ed25519_dalek::PublicKey;
use ed25519_dalek::Verifier;
use ed25519_dalek::Signature;
use std::convert::TryInto;
lazy_static::lazy_static! {
static ref SIGNATURE_TIME_HISTOGRAM: HistogramVec = register_histogram_vec!(
"nova_webhook_signature_time",
"The time taken by the signature verification",
&["signature"]
).unwrap();
static ref SIGNATURE_COUNTER: Counter = register_counter!(opts!(
"nova_webhook_signatures_verify",
"number of signatures verification issued by the service",
labels! {"handler" => "webhook_main"}
)).unwrap();
}
fn demo<T, const N: usize>(v: Vec<T>) -> [T; N] {
v.try_into()
.unwrap_or_else(|v: Vec<T>| panic!("Expected a Vec of length {} but it was {}", N, v.len()))
}
pub fn validate_signature(public_key: &PublicKey, data: &[u8], hex_signature: &str) -> bool {
SIGNATURE_COUNTER.inc();
let timer = SIGNATURE_TIME_HISTOGRAM.with_label_values(&["webhook_main"]).start_timer();
let signature_result = hex::decode(hex_signature);
let mut result = false;
if let Ok(signature) = signature_result {
let sig = Signature::from(demo(signature));
result = public_key.verify(data, &sig).is_ok();
}
timer.observe_duration();
result
}
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