Add User models

src/models/user.rs

@@ -0,0 +1,112 @@
+//! Various user types. Some types marked server-only to help prevent
+//! leaking passwords to the frontend
+
+/// Standard informational user type, contains no password information
+#[derive(Clone, Debug)]
+#[cfg_attr(feature = "server", derive(Queryable, Selectable, Identifiable))]
+#[cfg_attr(feature = "server", diesel(table_name = crate::schema::users,
+        check_for_backend(diesel::pg::Pg)))]
+pub struct User {
+    pub id: i32,
+    pub username: String,
+    pub created_at: chrono::DateTime<chrono::Local>,
+}
+
+/// Plaintext user credentials, used for login/signup form
+pub struct UserCredentials {
+    pub username: String,
+    pub password: String,
+}
+
+cfg_if::cfg_if! {
+if #[cfg(feature = "server")] {
+
+use diesel::{
+    deserialize::{FromSql, FromSqlRow},
+    expression::AsExpression,
+    prelude::*,
+    serialize::ToSql,
+    sql_types,
+};
+use pbkdf2::{PasswordHasher, Pbkdf2};
+
+/// Newtype for a `String`-represented hashed password
+#[derive(Clone, Debug, AsExpression, FromSqlRow)]
+#[diesel(sql_type = sql_types::Text)]
+pub struct HashedPassword(String);
+
+impl<DB> FromSql<diesel::sql_types::Text, DB> for HashedPassword
+where
+    DB: diesel::backend::Backend,
+    String: FromSql<sql_types::Text, DB>,
+{
+    fn from_sql(bytes: DB::RawValue<'_>) -> diesel::deserialize::Result<Self> {
+        Ok(Self(String::from_sql(bytes)?))
+    }
+}
+
+impl<DB> ToSql<diesel::sql_types::Text, DB> for HashedPassword
+where
+    DB: diesel::backend::Backend,
+    String: ToSql<sql_types::Text, DB>,
+{
+    fn to_sql<'b>(
+        &'b self,
+        out: &mut diesel::serialize::Output<'b, '_, DB>,
+    ) -> diesel::serialize::Result {
+        self.0.to_sql(out)
+    }
+}
+
+/// User as it appears in the database, with hashed password
+#[derive(Clone, Debug, Identifiable, Queryable, Selectable)]
+#[diesel(table_name = crate::schema::users, check_for_backend(diesel::pg::Pg))]
+pub struct DbUser {
+    pub id: i32,
+    pub username: String,
+    pub hashed_password: HashedPassword,
+    pub created_at: chrono::DateTime<chrono::Local>,
+}
+
+impl From<DbUser> for User {
+    fn from(db_user: DbUser) -> Self {
+        User {
+            id: db_user.id,
+            username: db_user.username,
+            created_at: db_user.created_at,
+        }
+    }
+}
+
+/// User credentials with hashed password
+#[derive(Clone, Debug, Insertable, Queryable, Selectable)]
+#[diesel(table_name = crate::schema::users, check_for_backend(diesel::pg::Pg))]
+pub struct HashedUserCredentials {
+    username: String,
+    hashed_password: HashedPassword,
+}
+
+impl From<DbUser> for HashedUserCredentials {
+    fn from(db_user: DbUser) -> Self {
+        HashedUserCredentials {
+            username: db_user.username,
+            hashed_password: db_user.hashed_password,
+        }
+    }
+}
+
+impl UserCredentials {
+    /// Attempt to convert into `HashedUserCredentials` by hashing the password. Yields a PBKDF2
+    /// error on failure.
+    pub fn try_hash(self) -> Result<HashedUserCredentials, pbkdf2::password_hash::Error> {
+        let hashed_password = Pbkdf2::default().hash_password(self.password.as_bytes())?;
+
+        Ok(HashedUserCredentials {
+            username: self.username,
+            hashed_password: HashedPassword(hashed_password.to_string()),
+        })
+    }
+}
+
+}
+}