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use std::{io::Read, time::Duration};
use jsonwebtoken::{decode, decode_header, jwk::JwkSet, DecodingKey, TokenData, Validation};
use serde::de::DeserializeOwned;
use crate::{
error::{AuthError, InitError},
jwks::{key_store_manager::KeyStoreManager, KeySource},
};
pub trait ClaimsChecker<C> {
fn check(&self, claims: &C) -> bool;
}
#[derive(Clone)]
pub struct FnClaimsChecker<C>
where
C: Clone,
{
pub checker_fn: fn(&C) -> bool,
}
impl<C> ClaimsChecker<C> for FnClaimsChecker<C>
where
C: Clone,
{
fn check(&self, claims: &C) -> bool {
(self.checker_fn)(claims)
}
}
pub struct Authorizer<C>
where
C: Clone,
{
pub key_source: KeySource,
pub claims_checker: Option<FnClaimsChecker<C>>,
}
fn read_data(path: &str) -> Result<Vec<u8>, InitError> {
let mut data = Vec::<u8>::new();
let mut f = std::fs::File::open(path)?;
f.read_to_end(&mut data)?;
Ok(data)
}
pub enum KeySourceType {
RSA(String),
EC(String),
ED(String),
Secret(&'static str),
Jwks(String),
}
impl<C> Authorizer<C>
where
C: DeserializeOwned + Clone + Send + Sync,
{
pub fn from_jwks(jwks: &str, claims_checker: Option<FnClaimsChecker<C>>) -> Result<Authorizer<C>, AuthError> {
let set: JwkSet = serde_json::from_str(jwks)?;
let k = DecodingKey::from_jwk(&set.keys[0])?;
Ok(Authorizer {
key_source: KeySource::DecodingKeySource(k),
claims_checker,
})
}
pub fn from(key_source_type: &KeySourceType) -> Result<Authorizer<C>, InitError> {
let key = match key_source_type {
KeySourceType::RSA(path) => DecodingKey::from_rsa_pem(&read_data(path.as_str())?)?,
KeySourceType::EC(path) => DecodingKey::from_ec_der(&read_data(path.as_str())?),
KeySourceType::ED(path) => DecodingKey::from_ed_der(&read_data(path.as_str())?),
KeySourceType::Secret(secret) => DecodingKey::from_secret(secret.as_bytes()),
KeySourceType::Jwks(_) => panic!("bug: use from_jwks_url() to initialise Authorizer"), };
Ok(Authorizer {
key_source: KeySource::DecodingKeySource(key),
claims_checker: None,
})
}
pub fn from_jwks_url(url: &str, claims_checker: Option<FnClaimsChecker<C>>) -> Result<Authorizer<C>, InitError> {
let key_store_manager = KeyStoreManager::with_refresh_interval(url, Duration::from_secs(60));
Ok(Authorizer {
key_source: KeySource::KeyStoreSource(key_store_manager),
claims_checker,
})
}
pub async fn check_auth(&self, token: &str) -> Result<TokenData<C>, AuthError> {
let header = decode_header(token)?;
let validation = Validation::new(header.alg);
let decoding_key = self.key_source.get_key(header).await?;
let token_data = decode::<C>(token, &decoding_key, &validation)?;
if let Some(ref checker) = self.claims_checker {
if !checker.check(&token_data.claims) {
return Err(AuthError::InvalidClaims());
}
}
Ok(token_data)
}
}
#[cfg(test)]
mod tests {
use jsonwebtoken::{Algorithm, Header};
use serde_json::Value;
use super::{Authorizer, KeySourceType};
#[tokio::test]
async fn from_secret() {
let h = Header::new(Algorithm::HS256);
let a = Authorizer::<Value>::from(&KeySourceType::Secret("xxxxxx")).unwrap();
let k = a.key_source.get_key(h);
assert!(k.await.is_ok());
}
#[tokio::test]
async fn from_jwks() {
let jwks = r#"
{"keys": [{
"kid": "1",
"kty": "RSA",
"alg": "RS256",
"use": "sig",
"n": "2pQeZdxa7q093K7bj5h6-leIpxfTnuAxzXdhjfGEJHxmt2ekHyCBWWWXCBiDn2RTcEBcy6gZqOW45Uy_tw-5e-Px1xFj1PykGEkRlOpYSAeWsNaAWvvpGB9m4zQ0PgZeMDDXE5IIBrY6YAzmGQxV-fcGGLhJnXl0-5_z7tKC7RvBoT3SGwlc_AmJqpFtTpEBn_fDnyqiZbpcjXYLExFpExm41xDitRKHWIwfc3dV8_vlNntlxCPGy_THkjdXJoHv2IJmlhvmr5_h03iGMLWDKSywxOol_4Wc1BT7Hb6byMxW40GKwSJJ4p7W8eI5mqggRHc8jlwSsTN9LZ2VOvO-XiVShZRVg7JeraGAfWwaIgIJ1D8C1h5Pi0iFpp2suxpHAXHfyLMJXuVotpXbDh4NDX-A4KRMgaxcfAcui_x6gybksq6gF90-9nfQfmVMVJctZ6M-FvRr-itd1Nef5WAtwUp1qyZygAXU3cH3rarscajmurOsP6dE1OHl3grY_eZhQxk33VBK9lavqNKPg6Q_PLiq1ojbYBj3bcYifJrsNeQwxldQP83aWt5rGtgZTehKVJwa40Uy_Grae1iRnsDtdSy5sTJIJ6EiShnWAdMoGejdiI8vpkjrdU8SWH8lv1KXI54DsbyAuke2cYz02zPWc6JEotQqI0HwhzU0KHyoY4s",
"e": "AQAB"
}]}
"#;
let a = Authorizer::<Value>::from_jwks(jwks, None).unwrap();
let k = a.key_source.get_key(Header::new(Algorithm::RS256));
assert!(k.await.is_ok());
}
#[tokio::test]
async fn from_file() {
let a = Authorizer::<Value>::from(&KeySourceType::RSA("../config/jwtRS256.key.pub".to_owned())).unwrap();
let k = a.key_source.get_key(Header::new(Algorithm::RS256));
assert!(k.await.is_ok());
let a = Authorizer::<Value>::from(&KeySourceType::EC("../config/ec256-public.pem".to_owned())).unwrap();
let k = a.key_source.get_key(Header::new(Algorithm::ES256));
assert!(k.await.is_ok());
let a = Authorizer::<Value>::from(&KeySourceType::ED("../config/ed25519-public.pem".to_owned())).unwrap();
let k = a.key_source.get_key(Header::new(Algorithm::EdDSA));
assert!(k.await.is_ok());
}
#[tokio::test]
async fn from_file_errors() {
let a = Authorizer::<Value>::from(&KeySourceType::RSA("./config/does-not-exist.pem".to_owned()));
println!("{:?}", a.as_ref().err());
assert!(a.is_err());
}
}