feat(gpodder): add create_user method to AuthStore

gpodder_sqlite/src/repository/auth.rs

@@ -4,7 +4,10 @@ use gpodder::AuthErr;
 
 use super::SqliteRepository;
 use crate::{
-    models::{session::Session, user::User},
+    models::{
+        session::Session,
+        user::{NewUser, User},
+    },
     schema::*,
     DbError,
 };
@@ -30,18 +33,34 @@ impl gpodder::AuthStore for SqliteRepository {
             .map(gpodder::User::from))
     }
 
+    fn insert_user(&self, username: &str, password_hash: &str) -> Result<gpodder::User, AuthErr> {
+        let conn = &mut self.pool.get().map_err(DbError::from)?;
+
+        Ok(diesel::insert_into(users::table)
+            .values(NewUser {
+                username,
+                password_hash,
+            })
+            .returning(User::as_returning())
+            .get_result(conn)
+            .map(gpodder::User::from)
+            .map_err(DbError::from)?)
+    }
+
     fn get_session(&self, session_id: i64) -> Result<Option<gpodder::models::Session>, AuthErr> {
         match sessions::table
             .inner_join(users::table)
             .filter(sessions::id.eq(session_id))
             .select((Session::as_select(), User::as_select()))
             .get_result(&mut self.pool.get().map_err(DbError::from)?)
+            .optional()
         {
-            Ok((session, user)) => Ok(Some(gpodder::Session {
+            Ok(Some((session, user))) => Ok(Some(gpodder::Session {
                 id: session.id,
                 last_seen: DateTime::from_timestamp(session.last_seen, 0).unwrap(),
                 user: user.into(),
             })),
+            Ok(None) => Ok(None),
             Err(err) => Err(DbError::from(err).into()),
         }
     }