Add JWT signing and verification

src/auth/jwt.rs

@@ -0,0 +1,35 @@
+use jsonwebtoken::{decode, encode, DecodingKey, EncodingKey, Header, Validation};
+use serde::{Deserialize, Serialize};
+use std::env;
+
+#[derive(Debug, Serialize, Deserialize)]
+pub struct Claims {
+    pub sub: String,  // user id
+    pub exp: usize,
+}
+
+pub fn sign(user_id: &str) -> anyhow::Result<String> {
+    let secret = env::var("JWT_SECRET")?;
+    let expiry: usize = env::var("JWT_EXPIRY_SECS")
+        .unwrap_or("3600".into())
+        .parse()?;
+    let now = std::time::SystemTime::now()
+        .duration_since(std::time::UNIX_EPOCH)?
+        .as_secs() as usize;
+    let claims = Claims { sub: user_id.to_owned(), exp: now + expiry };
+    Ok(encode(
+        &Header::default(),
+        &claims,
+        &EncodingKey::from_secret(secret.as_bytes()),
+    )?)
+}
+
+pub fn verify(token: &str) -> anyhow::Result<Claims> {
+    let secret = env::var("JWT_SECRET")?;
+    let data = decode::<Claims>(
+        token,
+        &DecodingKey::from_secret(secret.as_bytes()),
+        &Validation::default(),
+    )?;
+    Ok(data.claims)
+}