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extern crate base64;
#[macro_use]
extern crate error_chain;
extern crate openssl;
pub mod errors {
use base64;
use openssl;
error_chain! {
foreign_links {
Base64(base64::DecodeError);
Openssl(openssl::error::ErrorStack);
}
errors {
SignatureNotFound {
display("no signature could be found in params")
}
}
}
}
use std::fmt::Display;
use std::ops::Deref;
use openssl::hash::MessageDigest;
use openssl::pkey::PKey;
use openssl::rsa::Rsa;
use openssl::sign::Verifier;
use errors::*;
// https://paddle.com/docs/reference-verifying-webhooks/
pub fn verify_signature<'a, S, I>(
pem: &[u8],
params: I,
) -> Result<bool>
where
S: AsRef<str> + Deref<Target = str> + PartialEq<str> + PartialOrd + Display,
I: IntoIterator<Item = (S, S)> + PartialOrd,
{
let rsa = Rsa::public_key_from_pem(pem)?;
let pkey = PKey::from_rsa(rsa)?;
let mut verifier = Verifier::new(MessageDigest::sha1(), &pkey)?;
let (signature_params, params): (Vec<_>, Vec<_>) = params
.into_iter()
.partition(|(k, _v)| k == "p_signature");
let signature = &signature_params
.first()
.ok_or(ErrorKind::SignatureNotFound)?
.1;
let signature = base64::decode(signature.as_bytes())?;
let digest = php_serialize(params);
verifier.update(digest.as_bytes())?;
Ok(verifier.verify(&signature)?)
}
fn php_serialize<'a, S, I>(pairs: I) -> String
where
S: AsRef<str> + Deref<Target = str> + Display,
I: IntoIterator<Item = (S, S)> + PartialOrd,
{
let mut serialized = String::with_capacity(500);
let mut len = 0;
for (key, value) in pairs {
serialized.push_str(
&format!(
"s:{key_length}:\"{key}\";s:{value_length}:\"{value}\";",
key_length = key.chars().count(),
key = key,
value_length = value.chars().count(),
value = value
)
);
len += 1;
}
serialized.push_str("}");
format!(
"a:{pairs_count}:{{{rest}",
pairs_count = len,
rest = serialized
)
}
#[cfg(test)]
mod tests {
use std::collections::BTreeMap;
use super::*;
#[test]
fn php_serialize_serializes_key_values_as_php_string() {
let mut data = BTreeMap::new();
data.insert("checkout_id", "1234asdfjkl");
data.insert("currency", "USD");
data.insert("customer_name", "Senjougahara");
let expected = r#"a:3:{s:11:"checkout_id";s:11:"1234asdfjkl";s:8:"currency";s:3:"USD";s:13:"customer_name";s:12:"Senjougahara";}"#;
let serialized_data = php_serialize(data);
assert_eq!(serialized_data, expected);
}
}
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