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|
//! Example JWT authorization/authentication.
//!
//! Run with
//!
//! ```not_rust
//! JWT_SECRET=secret cargo run -p example-jwt
//! ```
use axum::{
async_trait,
extract::FromRequestParts,
http::{request::Parts, StatusCode},
response::{IntoResponse, Response},
routing::{get, post},
Json, RequestPartsExt, Router,
};
use axum_extra::{
headers::{authorization::Bearer, Authorization},
TypedHeader,
};
use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
use once_cell::sync::Lazy;
use serde::{Deserialize, Serialize};
use serde_json::json;
use std::fmt::Display;
use tracing_subscriber::{layer::SubscriberExt, util::SubscriberInitExt};
// Quick instructions
//
// - get an authorization token:
//
// curl -s \
// -w '\n' \
// -H 'Content-Type: application/json' \
// -d '{"client_id":"foo","client_secret":"bar"}' \
// http://localhost:3000/authorize
//
// - visit the protected area using the authorized token
//
// curl -s \
// -w '\n' \
// -H 'Content-Type: application/json' \
// -H 'Authorization: Bearer eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJzdWIiOiJiQGIuY29tIiwiY29tcGFueSI6IkFDTUUiLCJleHAiOjEwMDAwMDAwMDAwfQ.M3LAZmrzUkXDC1q5mSzFAs_kJrwuKz3jOoDmjJ0G4gM' \
// http://localhost:3000/protected
//
// - try to visit the protected area using an invalid token
//
// curl -s \
// -w '\n' \
// -H 'Content-Type: application/json' \
// -H 'Authorization: Bearer blahblahblah' \
// http://localhost:3000/protected
static KEYS: Lazy<Keys> = Lazy::new(|| {
let secret = std::env::var("JWT_SECRET").expect("JWT_SECRET must be set");
Keys::new(secret.as_bytes())
});
#[tokio::main]
async fn main() {
tracing_subscriber::registry()
.with(
tracing_subscriber::EnvFilter::try_from_default_env()
.unwrap_or_else(|_| format!("{}=debug", env!("CARGO_CRATE_NAME")).into()),
)
.with(tracing_subscriber::fmt::layer())
.init();
let app = Router::new()
.route("/protected", get(protected))
.route("/authorize", post(authorize));
let listener = tokio::net::TcpListener::bind("127.0.0.1:3000")
.await
.unwrap();
tracing::debug!("listening on {}", listener.local_addr().unwrap());
axum::serve(listener, app).await.unwrap();
}
async fn protected(claims: Claims) -> Result<String, AuthError> {
// Send the protected data to the user
Ok(format!(
"Welcome to the protected area :)\nYour data:\n{claims}",
))
}
async fn authorize(Json(payload): Json<AuthPayload>) -> Result<Json<AuthBody>, AuthError> {
// Check if the user sent the credentials
if payload.client_id.is_empty() || payload.client_secret.is_empty() {
return Err(AuthError::MissingCredentials);
}
// Here you can check the user credentials from a database
if payload.client_id != "foo" || payload.client_secret != "bar" {
return Err(AuthError::WrongCredentials);
}
let claims = Claims {
sub: "b@b.com".to_owned(),
company: "ACME".to_owned(),
// Mandatory expiry time as UTC timestamp
exp: 2000000000, // May 2033
};
// Create the authorization token
let token = encode(&Header::default(), &claims, &KEYS.encoding)
.map_err(|_| AuthError::TokenCreation)?;
// Send the authorized token
Ok(Json(AuthBody::new(token)))
}
impl Display for Claims {
fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
write!(f, "Email: {}\nCompany: {}", self.sub, self.company)
}
}
impl AuthBody {
fn new(access_token: String) -> Self {
Self {
access_token,
token_type: "Bearer".to_string(),
}
}
}
#[async_trait]
impl<S> FromRequestParts<S> for Claims
where
S: Send + Sync,
{
type Rejection = AuthError;
async fn from_request_parts(parts: &mut Parts, _state: &S) -> Result<Self, Self::Rejection> {
// Extract the token from the authorization header
let TypedHeader(Authorization(bearer)) = parts
.extract::<TypedHeader<Authorization<Bearer>>>()
.await
.map_err(|_| AuthError::InvalidToken)?;
// Decode the user data
let token_data = decode::<Claims>(bearer.token(), &KEYS.decoding, &Validation::default())
.map_err(|_| AuthError::InvalidToken)?;
Ok(token_data.claims)
}
}
impl IntoResponse for AuthError {
fn into_response(self) -> Response {
let (status, error_message) = match self {
AuthError::WrongCredentials => (StatusCode::UNAUTHORIZED, "Wrong credentials"),
AuthError::MissingCredentials => (StatusCode::BAD_REQUEST, "Missing credentials"),
AuthError::TokenCreation => (StatusCode::INTERNAL_SERVER_ERROR, "Token creation error"),
AuthError::InvalidToken => (StatusCode::BAD_REQUEST, "Invalid token"),
};
let body = Json(json!({
"error": error_message,
}));
(status, body).into_response()
}
}
struct Keys {
encoding: EncodingKey,
decoding: DecodingKey,
}
impl Keys {
fn new(secret: &[u8]) -> Self {
Self {
encoding: EncodingKey::from_secret(secret),
decoding: DecodingKey::from_secret(secret),
}
}
}
#[derive(Debug, Serialize, Deserialize)]
struct Claims {
sub: String,
company: String,
exp: usize,
}
#[derive(Debug, Serialize)]
struct AuthBody {
access_token: String,
token_type: String,
}
#[derive(Debug, Deserialize)]
struct AuthPayload {
client_id: String,
client_secret: String,
}
#[derive(Debug)]
enum AuthError {
WrongCredentials,
MissingCredentials,
TokenCreation,
InvalidToken,
}
|
