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#![deny(missing_docs, unsafe_code, unused_extern_crates, warnings)]
extern crate openssl;
extern crate base64;
#[macro_use] extern crate error_chain;
#[macro_use] extern crate serde_json;
use std::borrow::Cow;
use std::str::FromStr;
use std::fmt;
use std::time::{ SystemTime, UNIX_EPOCH };
pub mod error;
pub mod algorithm;
pub mod signature;
pub mod claims;
pub mod verification;
pub use error::Error;
pub use algorithm::Algorithm;
pub use claims::RegisteredClaims;
pub use verification::Verifications;
use signature::{ AsKey, Sign, HMAC, RSA, ECDSA, BindSignature };
use serde_json::Value;
#[derive(Debug, Clone)]
pub struct Jwt<'jwt>(Cow<'jwt, str>);
impl<'jwt> Jwt<'jwt> {
pub fn new<S>(raw: S) -> Self where S: Into<Cow<'jwt, str>> {
Jwt(raw.into())
}
pub fn encode<K: AsKey>(header: &Header, payload: &Payload, key: &K, algorithm: Option<Algorithm>) -> error::Result<Self> {
let algorithm = match algorithm {
Some(algorithm) => algorithm,
None => header.as_algorithm()?
};
let header = header.from_base64()?;
let mut header: Value = serde_json::from_slice(&header)?;
header["alg"] = Value::String(algorithm.to_string());
header["typ"] = Value::String("JWT".to_owned());
let header = header.as_base64()?;
let header = Header::new(header);
let to_sign = format!("{}.{}", header, payload);
let signature = match algorithm {
Algorithm::HS256 | Algorithm::HS384 | Algorithm::HS512 => HMAC::sign(&to_sign, key, algorithm)?,
Algorithm::RS256 | Algorithm::RS384 | Algorithm::RS512 => RSA::sign(&to_sign, key, algorithm)?,
Algorithm::ES256 | Algorithm::ES384 | Algorithm::ES512 => ECDSA::sign(&to_sign, key, algorithm)?,
};
let token = Jwt::new(format!("{}.{}", to_sign, signature.0));
Ok(token)
}
pub fn decode<K: AsKey>(&self, key: &K, algorithm: Option<Algorithm>) -> error::Result<Parts> {
let parts = self.into_parts()?;
let Parts { header, payload, signature } = parts.clone();
let algorithm = match algorithm {
Some(algorithm) => algorithm,
None => header.as_algorithm()?
};
let data = format!("{}.{}", header, payload);
let signature = BindSignature(signature, algorithm);
let verification = match algorithm {
Algorithm::HS256 | Algorithm::HS384 | Algorithm::HS512 => HMAC::verify(signature, &data, key)?,
Algorithm::RS256 | Algorithm::RS384 | Algorithm::RS512 => RSA::verify(signature, &data, key)?,
Algorithm::ES256 | Algorithm::ES384 | Algorithm::ES512 => ECDSA::verify(signature, &data, key)?,
};
if !verification {
bail!(error::ErrorKind::InvalidSignature);
} else {
Ok(parts)
}
}
}
pub trait IntoParts<'c> {
type Error;
fn into_parts (&'c self) -> Result<Parts, Self::Error>;
}
impl<'jwt> IntoParts<'jwt> for Jwt<'jwt> {
type Error = error::Error;
fn into_parts (&'jwt self) -> error::Result<Parts> {
let parts: Vec<&'jwt str> = self.0.split(".").collect();
if parts.len() != 3 {
unimplemented!()
}
let parts = Parts {
header: Header::new(parts[0]),
payload: Payload::new(parts[1]),
signature: Signature::new(parts[2])
};
Ok(parts)
}
}
pub trait AsBase64 {
fn as_base64 (&self) -> error::Result<String>;
}
impl AsBase64 for Value {
fn as_base64 (&self) -> error::Result<String> {
let value = serde_json::to_string(&self)?;
Ok(base64::encode_config(value.as_bytes(), base64::URL_SAFE))
}
}
pub trait FromBase64 {
fn from_base64 (&self) -> error::Result<Vec<u8>>;
}
#[derive(Debug, Clone)]
pub struct Parts<'h, 'p, 's> {
header: Header<'h>,
payload: Payload<'p>,
signature: Signature<'s>
}
impl<'h, 'p, 's, 'jwt> Into<Jwt<'jwt>> for Parts<'h, 'p, 's> {
fn into (self) -> Jwt<'jwt> {
let jwt = format!("{}.{}.{}", self.header.0, self.payload.0, self.signature.0);
Jwt::new(jwt)
}
}
#[derive(Debug, Clone)]
pub struct Header<'h>(Cow<'h, str>);
impl<'h> Header<'h> {
pub fn new<S>(raw: S) -> Self where S: Into<Cow<'h, str>> {
Header(raw.into())
}
pub fn convert<T>(base: T) -> error::Result<Self> where T: AsBase64 {
Ok(Header::new(base.as_base64()?))
}
pub fn as_algorithm(&self) -> error::Result<Algorithm> {
let header = self.from_base64()?;
let header = header.as_slice();
let header: Value = serde_json::from_slice(header)?;
let header = header["alg"].as_str().ok_or(error::ErrorKind::MissingAlgorithm)?;
let algorithm = Algorithm::from_str(header)?;
Ok(algorithm)
}
}
impl<'h> FromBase64 for Header<'h> {
fn from_base64(&self) -> error::Result<Vec<u8>> {
let convertion = &*self.0;
let convertion = base64::decode_config(&convertion, base64::URL_SAFE)?;
Ok(convertion)
}
}
impl<'h> fmt::Display for Header<'h> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
#[derive(Debug, Clone)]
pub struct Payload<'p>(Cow<'p, str>);
impl<'p> Payload<'p> {
pub fn new<S>(raw: S) -> Self where S: Into<Cow<'p, str>> {
Payload(raw.into())
}
pub fn convert<T>(base: T) -> error::Result<Self> where T: AsBase64 {
Ok(Payload::new(base.as_base64()?))
}
pub fn apply(self, claims: Vec<RegisteredClaims>) -> error::Result<Payload<'p>> {
let payload = self.from_base64()?;
let mut payload: Value = serde_json::from_slice(&payload)?;
for claim in claims {
payload[claim.to_string()] = claim.clone().into();
}
let payload = payload.as_base64()?;
let payload = Payload::new(payload);
Ok(payload)
}
pub fn verify(&self, verification: Vec<Verifications>) -> error::Result<()> {
let payload = self.from_base64()?;
let payload: Value = serde_json::from_slice(&payload)?;
for verification in verification {
match verification {
Verifications::SameClaim(claim) => {
let payload = &payload[claim.to_string()];
let claim: Value = claim.clone().into();
if *payload != claim {
bail!(error::ErrorKind::VerificationFailed("same_claim".to_string()))
}
},
Verifications::Expired => {
let now = SystemTime::now().duration_since(UNIX_EPOCH)?.as_secs();
let exp = payload["exp"].as_u64();
if exp <= Some(now) {
bail!(error::ErrorKind::VerificationFailed("token_expired".to_string()))
}
}
}
}
Ok(())
}
}
impl<'p> FromBase64 for Payload<'p> {
fn from_base64(&self) -> error::Result<Vec<u8>> {
let convertion = &*self.0;
let convertion = base64::decode_config(&convertion, base64::URL_SAFE)?;
Ok(convertion)
}
}
impl<'p> fmt::Display for Payload<'p> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
#[derive(Debug, Clone, PartialEq)]
pub struct Signature<'s>(Cow<'s, str>);
impl<'s> Signature<'s> {
pub fn new<S>(raw: S) -> Self where S: Into<Cow<'s, str>> {
Signature(raw.into())
}
}
impl<'s> fmt::Display for Signature<'s> {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
write!(f, "{}", self.0)
}
}
#[cfg(test)]
mod tests {
use super::{ Jwt, Algorithm, IntoParts, Header, Payload, Value, RegisteredClaims, Verifications, SystemTime, UNIX_EPOCH };
#[test]
fn jwt_from_str () {
let s = test_jwt();
let jwt = Jwt::new(s);
assert_eq!(jwt.0.into_owned(), String::from(s));
}
#[test]
fn jwt_from_string () {
let s = test_jwt();
let s = String::from(s);
let jwt = Jwt::new(s.clone());
assert_eq!(jwt.0.into_owned(), s);
}
#[test]
fn jwt_into_parts () {
let s = test_jwt();
let jwt = Jwt::new(s);
let parts = jwt.into_parts();
println!("{:?}", parts);
}
#[test]
fn jwt_creation () {
let now = SystemTime::now().duration_since(UNIX_EPOCH).unwrap().as_secs();
let header = json!({});
let header = Header::convert(header).unwrap();
let payload = json!({
"light": "discord"
});
let payload = Payload::convert(payload).unwrap();
let payload = payload.apply(vec![
RegisteredClaims::Audience("FBI!".to_string()),
RegisteredClaims::Issuer("Test-man".to_string()),
RegisteredClaims::IssuedAt(now),
RegisteredClaims::ExpirationTime(now + 10),
RegisteredClaims::Custom("hello".to_string(), Value::String("world".to_string()))
]).unwrap();
let key = "This is super mega secret!".to_string();
let jwt = Jwt::encode(&header, &payload, &key, Some(Algorithm::HS256)).unwrap();
let jwt = jwt.into_parts().unwrap();
let payload = jwt.payload.clone();
let _ = payload.verify(vec![
Verifications::SameClaim(RegisteredClaims::Issuer("Test-man".to_string())),
Verifications::SameClaim(RegisteredClaims::Custom("hello".to_string(), Value::String("world".to_string()))),
Verifications::Expired
]);
let jwt: Jwt = jwt.into();
println!("{:?}", jwt);
assert!(jwt.decode(&key, None).is_ok());
}
fn test_jwt () -> &'static str {
"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJhdWQiOiJGQkkhIGN1eicgaXQncyBzZWNyZXQhIHNodXQhIiwiZXhwIjoxNTE5OTk0NTAxLCJoZWxsbyI6IndvcmxkIiwiaWF0IjoxNTE5OTk0NDkxLCJpc3MiOiJUZXN0LW1hbiEiLCJsaWdodCI6ImRpc2NvcmQifQ==.gS76BWOStsnrG9nMacQQE7ThHM1UIR2omB6YkBaQjZ0="
}
}