I need to stop working on this shit.

src/db/_ledger_internal.rs

@@ -0,0 +1,39 @@
+use rusqlite::{Connection, params, Row, Transaction, Result};
+use crate::util::{CustomResult, Error};
+use base64::{Engine as _, engine::general_purpose};
+
+struct LedgerInternal {}
+
+impl LedgerInternal {
+    fn _decode_cookie_secret(row: &Row) -> Result<Vec<u8>> {
+        let encoded: String = row.get(0)?;
+        let ret = general_purpose::STANDARD.decode(encoded).unwrap();
+        Ok(ret)
+    }
+
+    pub fn get_cookie_secret(&self, tx: &Transaction) -> CustomResult<Vec<u8>> {
+        let q = "SELECT cookie_secret
+                      FROM ledger_internal
+                      ORDER BY cookie_secret DESC
+                      LIMIT 1";
+        tx.query_row(q, params![], Self::_decode_cookie_secret)
+            .map_err(Error::SqlError)
+    }
+
+    pub fn set_cookie_secret(&self, tx: &Transaction, secret: &Vec<u8>) {
+        let q = "CREATE TEMPORARY TABLE foo
+                         AS SELECT * FROM ledger_internal
+                            ORDER BY cookie_secret DESC
+                            LIMIT 1";
+    }
+}
+
+#[cfg(test)]
+mod test_ledger_internal {
+    use super::*;
+
+    #[test]
+    fn test_foo() {
+
+    }
+}

src/db/mod.rs

@@ -5,6 +5,7 @@ mod _interests;
 mod _securities;
 mod _test_utils;
 mod _users;
+mod _ledger_internal;
 
 pub mod external_id {
     pub use super::_external_id::*;

src/services/_authentication.rs

@@ -0,0 +1,40 @@
+use actix_web::HttpRequest;
+use cookie::{CookieJar, Cookie, Key};
+use cookie::time::OffsetDateTime;
+
+struct SessionService {
+    key: Key,
+}
+
+impl SessionService {
+    fn new() -> SessionService{
+        let super_secret_not_hardcoded_at_all: [u8; 32] = [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1];
+        SessionService{key: Key::derive_from(&super_secret_not_hardcoded_at_all)}
+    }
+
+    fn create_login_cookie(&self, user_id: &String ) -> Cookie{
+        let mut jar = CookieJar::new();
+        jar.private_mut(& self.key).add(Cookie::new("ledger-user-id", user_id.clone()));
+        jar.get("ledger-user-id").unwrap_or(& Cookie::new("ledger-user-id", "")).clone()
+    }
+
+    fn _decrypt_cookie(&self, cookie: Cookie<'static>) -> Option<Cookie>{
+        let mut jar = CookieJar::new();
+        jar.private(& self.key).decrypt(cookie)
+    }
+
+    // todo: this service should not be aware of http requests.
+    //       basically, it should be easy to migrate of
+    //       web framework
+    fn get_login(&self, req: &HttpRequest) -> Option<String> {
+        req.cookie("ledger-user-id")
+            .and_then(|c|self._decrypt_cookie(c)).map(|c| c.value().to_string())
+    }
+
+    fn logout(&self) -> Cookie{
+        let mut cookie = Cookie::new("ledger-user-id", "");
+        let epoch = OffsetDateTime::from_unix_timestamp_nanos(0).unwrap();
+        cookie.set_expires(epoch);
+        cookie
+    }
+}

src/services/mod.rs

@@ -4,6 +4,7 @@ use crate::services::_users::UserService;
 
 mod _transactions;
 mod _users;
+mod _authentication;
 
 pub struct ServiceFactory<'a> {
     conn: &'a Connection,