systemprompt_security/jwt/
decode.rs

1//! Bearer-token decode for request-context middleware.
2//!
3//! [`extract_user_context`] decodes via
4//! [`super::validate::decode_rs256_claims`]
5//! with [`ValidationPolicy::session_context`] (signature, RS256, `kid`, `exp`,
6//! `nbf` + leeway, first-party `aud`), then re-derives `user_type` from
7//! `scope` so a forged or mis-minted type claim cannot ride past the gate, and
8//! returns the subset of claims the request-context layer consumes
9//! ([`JwtUserContext`]). Issuer pinning is left to the stateful validators
10//! that hold deployment config ([`crate::AuthValidationService`]); this path
11//! instead binds the token to a live session and user row in the database
12//! after decode.
13
14use std::collections::BTreeMap;
15use systemprompt_identifiers::{Actor, ClientId, SessionId, UserId};
16use systemprompt_models::auth::{Permission, UserType};
17
18use super::validate::{ValidationPolicy, decode_rs256_claims};
19use crate::error::{AuthError, AuthResult};
20
21#[derive(Debug, Clone)]
22pub struct JwtUserContext {
23    pub user_id: UserId,
24    pub session_id: SessionId,
25    pub role: Permission,
26    pub user_type: UserType,
27    pub client_id: Option<ClientId>,
28    pub act_chain: Vec<Actor>,
29    pub attributes: BTreeMap<String, serde_json::Value>,
30    pub jti: String,
31    pub exp: i64,
32}
33
34pub fn extract_user_context(token: &str) -> AuthResult<JwtUserContext> {
35    let claims = decode_rs256_claims(token, &ValidationPolicy::session_context())?;
36
37    let session_id = claims.session_id.ok_or(AuthError::MissingSessionId)?;
38    let role = *claims.scope.first().ok_or(AuthError::MissingScope)?;
39    let derived_type = UserType::from_permissions(&claims.scope);
40    if derived_type != claims.user_type {
41        return Err(AuthError::UserTypeMismatch {
42            claimed: claims.user_type,
43            derived: derived_type,
44        });
45    }
46    let act_chain = claims
47        .act
48        .as_ref()
49        .map(systemprompt_models::auth::ActClaim::flatten_to_chain)
50        .unwrap_or_default();
51
52    Ok(JwtUserContext {
53        user_id: UserId::new(claims.sub),
54        session_id,
55        role,
56        user_type: derived_type,
57        client_id: claims.client_id,
58        act_chain,
59        attributes: claims.attributes,
60        jti: claims.jti,
61        exp: claims.exp,
62    })
63}
systemprompt_security/jwt/decode.rs

systemprompt_security/jwt/
decode.rs
