Add web site settings

backend/src/data/db/mod.rs

@@ -16,6 +16,7 @@ use tracing::{event, Level};
 use crate::consts;
 
 pub mod recipe;
+pub mod settings;
 pub mod user;
 
 const CURRENT_DB_VERSION: u32 = 1;

backend/src/data/db/settings.rs

@@ -0,0 +1,26 @@
+use std::str::FromStr;
+
+use super::{Connection, DBError, Result};
+
+impl Connection {
+    pub async fn get_new_user_registration_enabled(&self) -> Result<bool> {
+        self.get("new_user_registration_enabled").await
+    }
+
+    async fn get<T>(&self, name: &str) -> Result<T>
+    where
+        T: FromStr,
+    {
+        let v: String = sqlx::query_scalar("SELECT [value] FROM [Settings] WHERE [name] = $1")
+            .bind(name)
+            .fetch_one(&self.pool)
+            .await?;
+
+        T::from_str(&v).map_err(|_| {
+            DBError::Other(format!(
+                "Can't convert string value \"{}\" when reading setting {}",
+                v, name
+            ))
+        })
+    }
+}