Add config controller in server

server/src/utils/config.rs

@@ -0,0 +1,44 @@
+use crate::utils::{error::*, DbPool};
+use sqlx::Row;
+
+pub struct ConfigManager;
+
+impl ConfigManager {
+    pub async fn get_config(pool: &DbPool, key: &str) -> AppResult<Option<String>> {
+        let row = sqlx::query("SELECT value FROM config WHERE key = ?")
+            .bind(key)
+            .fetch_optional(pool)
+            .await?;
+
+        if let Some(row) = row {
+            Ok(Some(row.get("value")))
+        } else {
+            Ok(None)
+        }
+    }
+
+    pub async fn set_config(pool: &DbPool, key: &str, value: &str) -> AppResult<()> {
+        sqlx::query(
+            r#"
+            INSERT INTO config (key, value, updated_at)
+            VALUES (?, ?, CURRENT_TIMESTAMP)
+            ON CONFLICT(key) DO UPDATE SET
+                value = excluded.value,
+                updated_at = CURRENT_TIMESTAMP
+            "#,
+        )
+        .bind(key)
+        .bind(value)
+        .execute(pool)
+        .await?;
+
+        Ok(())
+    }
+
+    pub async fn get_external_url(pool: &DbPool) -> AppResult<String> {
+        match Self::get_config(pool, "EXTERNAL_URL").await? {
+            Some(url) => Ok(url),
+            None => Err(internal_error("EXTERNAL_URL not configured")),
+        }
+    }
+}