swadhinbiswas ✨ feat: new auth module — Rust + Python bindings · 7/25/2026
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use pyo3::prelude::*;
use pyo3::types::{PyAnyMethods, PyDict, PyList};
/// Rust-native JWT encoding/decoding, backed by the `jsonwebtoken` crate.
/// No Python crypto library needed.
#[pyclass(name = "_JwtAuth")]
pub struct PyJwtAuth {
encoding_key: jsonwebtoken::EncodingKey,
decoding_key: jsonwebtoken::DecodingKey,
algorithm: jsonwebtoken::Algorithm,
validation: jsonwebtoken::Validation,
}
#[pymethods]
impl PyJwtAuth {
#[new]
#[pyo3(signature = (secret, algorithm = "HS256"))]
fn new(secret: &str, algorithm: &str) -> PyResult<Self> {
let alg = parse_algorithm(algorithm)?;
Ok(Self {
encoding_key: jsonwebtoken::EncodingKey::from_secret(secret.as_bytes()),
decoding_key: jsonwebtoken::DecodingKey::from_secret(secret.as_bytes()),
algorithm: alg,
validation: jsonwebtoken::Validation::new(alg),
})
}
fn encode(&self, _py: Python<'_>, claims: &Bound<'_, PyDict>) -> PyResult<String> {
let claims_json = claims_to_json(claims);
jsonwebtoken::encode(
&jsonwebtoken::Header::new(self.algorithm),
&claims_json,
&self.encoding_key,
)
.map_err(|e| pyo3::exceptions::PyValueError::new_err(e.to_string()))
}
#[pyo3(signature = (token, options = None))]
fn decode(
&self,
py: Python<'_>,
token: &str,
options: Option<&Bound<'_, PyDict>>,
) -> PyResult<Py<PyDict>> {
let mut validation = self.validation.clone();
if let Some(opts) = options {
for (k, v) in opts.iter() {
let key: String = k.extract()?;
let val: bool = v.extract()?;
if key.as_str() == "verify_exp" {
validation.validate_exp = val;
}
}
}
let token_data =
jsonwebtoken::decode::<serde_json::Value>(token, &self.decoding_key, &validation)
.map_err(|e| {
pyo3::exceptions::PyValueError::new_err(format!("Invalid token: {}", e))
})?;
json_value_to_py_dict(py, &token_data.claims)
}
fn __repr__(&self) -> String {
format!("_JwtAuth(algorithm={:?})", self.algorithm)
}
}
fn parse_algorithm(s: &str) -> PyResult<jsonwebtoken::Algorithm> {
match s.to_uppercase().as_str() {
"HS256" => Ok(jsonwebtoken::Algorithm::HS256),
"HS384" => Ok(jsonwebtoken::Algorithm::HS384),
"HS512" => Ok(jsonwebtoken::Algorithm::HS512),
"RS256" => Ok(jsonwebtoken::Algorithm::RS256),
"RS384" => Ok(jsonwebtoken::Algorithm::RS384),
"RS512" => Ok(jsonwebtoken::Algorithm::RS512),
"ES256" => Ok(jsonwebtoken::Algorithm::ES256),
"ES384" => Ok(jsonwebtoken::Algorithm::ES384),
"ED25519" => Ok(jsonwebtoken::Algorithm::EdDSA),
_ => Err(pyo3::exceptions::PyValueError::new_err(format!(
"Unsupported algorithm: {}. Use HS256, HS384, HS512, RS256, RS384, RS512, ES256, ES384, or ED25519",
s
))),
}
}
fn claims_to_json(claims: &Bound<'_, PyDict>) -> serde_json::Value {
let mut map = serde_json::Map::new();
for (k, v) in claims.iter() {
let key: String = k.extract().unwrap_or_default();
map.insert(key, py_any_to_json(&v));
}
serde_json::Value::Object(map)
}
fn py_any_to_json(obj: &Bound<'_, PyAny>) -> serde_json::Value {
if let Ok(s) = obj.extract::<String>() {
return serde_json::Value::String(s);
}
if let Ok(i) = obj.extract::<i64>() {
return serde_json::Value::Number(i.into());
}
if let Ok(f) = obj.extract::<f64>() {
if let Some(n) = serde_json::Number::from_f64(f) {
return serde_json::Value::Number(n);
}
return serde_json::Value::String(f.to_string());
}
if let Ok(b) = obj.extract::<bool>() {
return serde_json::Value::Bool(b);
}
if let Ok(list) = obj.extract::<Vec<Bound<'_, PyAny>>>() {
let arr: Vec<serde_json::Value> = list.iter().map(|x| py_any_to_json(x)).collect();
return serde_json::Value::Array(arr);
}
serde_json::Value::Null
}
fn json_value_to_py_dict(py: Python<'_>, value: &serde_json::Value) -> PyResult<Py<PyDict>> {
match value {
serde_json::Value::Object(map) => {
let d = PyDict::new(py);
for (k, v) in map {
d.set_item(k, json_value_to_py(py, v)?)?;
}
Ok(d.into())
}
_ => Err(pyo3::exceptions::PyTypeError::new_err("expected object")),
}
}
fn json_value_to_py<'py>(py: Python<'py>, v: &serde_json::Value) -> PyResult<Bound<'py, PyAny>> {
match v {
serde_json::Value::Null => Ok(py.None().into_bound(py)),
serde_json::Value::Bool(b) => Ok((*b).into_pyobject(py)?.as_any().clone()),
serde_json::Value::Number(n) => {
if let Some(i) = n.as_i64() {
Ok(i.into_pyobject(py)?.as_any().clone())
} else if let Some(u) = n.as_u64() {
Ok(u.into_pyobject(py)?.as_any().clone())
} else {
Ok(n.as_f64().unwrap_or(0.0).into_pyobject(py)?.as_any().clone())
}
}
serde_json::Value::String(s) => Ok(s.clone().into_pyobject(py)?.as_any().clone()),
serde_json::Value::Array(a) => {
let list = PyList::empty(py);
for item in a {
list.append(json_value_to_py(py, item)?)?;
}
Ok(list.as_any().clone())
}
serde_json::Value::Object(o) => {
let d = PyDict::new(py);
for (k, val) in o {
d.set_item(k, json_value_to_py(py, val)?)?;
}
Ok(d.as_any().clone())
}
}
}
pub fn register(m: &Bound<'_, PyModule>) -> PyResult<()> {
m.add_class::<PyJwtAuth>()?;
Ok(())
}