| 1 | //! Web login sessions: opaque random tokens stored server-side and referenced |
| 2 | //! by a cookie. |
| 3 | |
| 4 | use rand::{ |
| 5 | Rng, |
| 6 | rand_core::UnwrapErr, |
| 7 | rngs::SysRng, |
| 8 | }; |
| 9 | |
| 10 | use crate::{ |
| 11 | error::Result, |
| 12 | models::{ |
| 13 | Session, |
| 14 | User, |
| 15 | }, |
| 16 | }; |
| 17 | |
| 18 | /// Default session lifetime: 30 days. |
| 19 | const SESSION_TTL_SECS: i64 = 60 * 60 * 24 * 30; |
| 20 | |
| 21 | /// Generate a 256-bit random session token, hex-encoded. |
| 22 | fn generate_token() -> String { |
| 23 | let mut bytes = [0u8; 32]; |
| 24 | let mut rng = UnwrapErr(SysRng); |
| 25 | rng.fill_bytes(&mut bytes); |
| 26 | bytes.iter().map(|b| format!("{b:02x}")).collect() |
| 27 | } |
| 28 | |
| 29 | /// Create a new session for `user_id`, returning it (the `token` goes in a cookie). |
| 30 | pub async fn create(db: &toasty::Db, user_id: i64) -> Result<Session> { |
| 31 | let mut conn = db.clone(); |
| 32 | let now = crate::now(); |
| 33 | let session = toasty::create!(Session { |
| 34 | token: generate_token(), |
| 35 | user_id: user_id, |
| 36 | created_at: now, |
| 37 | expires_at: now + SESSION_TTL_SECS, |
| 38 | }) |
| 39 | .exec(&mut conn) |
| 40 | .await?; |
| 41 | Ok(session) |
| 42 | } |
| 43 | |
| 44 | /// Resolve a session token to its user, or `None` if missing/expired. |
| 45 | /// Expired sessions are deleted as a side effect. |
| 46 | pub async fn lookup_user(db: &toasty::Db, token: &str) -> Result<Option<User>> { |
| 47 | let mut conn = db.clone(); |
| 48 | let Some(session) = Session::filter(Session::fields().token().eq(token)) |
| 49 | .first() |
| 50 | .exec(&mut conn) |
| 51 | .await? |
| 52 | else { |
| 53 | return Ok(None); |
| 54 | }; |
| 55 | |
| 56 | if session.expires_at < crate::now() { |
| 57 | let mut conn = db.clone(); |
| 58 | let _ = session.delete().exec(&mut conn).await; |
| 59 | return Ok(None); |
| 60 | } |
| 61 | |
| 62 | let mut conn = db.clone(); |
| 63 | let user = User::filter(User::fields().id().eq(session.user_id)) |
| 64 | .first() |
| 65 | .exec(&mut conn) |
| 66 | .await?; |
| 67 | Ok(user) |
| 68 | } |
| 69 | |
| 70 | /// Delete a session (logout). No-op if the token is unknown. |
| 71 | pub async fn delete(db: &toasty::Db, token: &str) -> Result<()> { |
| 72 | let mut conn = db.clone(); |
| 73 | if let Some(session) = Session::filter(Session::fields().token().eq(token)) |
| 74 | .first() |
| 75 | .exec(&mut conn) |
| 76 | .await? |
| 77 | { |
| 78 | let mut conn = db.clone(); |
| 79 | session.delete().exec(&mut conn).await?; |
| 80 | } |
| 81 | Ok(()) |
| 82 | } |