Refactor: Fix clippy warnings and introduce AppError

server/src/error.rs

@@ -6,6 +6,8 @@ use axum::{
 use serde_json::json;
 use thiserror::Error;
 
+pub type Result<T> = std::result::Result<T, AppError>;
+
 #[derive(Error, Debug)]
 pub enum AppError {
     #[error("Not Found: {0}")]
@@ -19,6 +21,18 @@ pub enum AppError {
 
     #[error("Bad Request: {0}")]
     BadRequest(String),
+
+    #[error("Serialization Error: {0}")]
+    JsonError(#[from] serde_json::Error),
+
+    #[error("I/O Error: {0}")]
+    IoError(#[from] std::io::Error),
+}
+
+impl From<AppError> for String {
+    fn from(err: AppError) -> String {
+        err.to_string()
+    }
 }
 
 impl IntoResponse for AppError {
@@ -26,8 +40,10 @@ impl IntoResponse for AppError {
         let (status, error_message) = match &self {
             AppError::NotFound(msg) => (StatusCode::NOT_FOUND, msg.clone()),
             AppError::Forbidden(msg) => (StatusCode::FORBIDDEN, msg.clone()),
-            AppError::Internal(msg) => (StatusCode::INTERNAL_SERVER_ERROR, msg.clone()),
             AppError::BadRequest(msg) => (StatusCode::BAD_REQUEST, msg.clone()),
+            AppError::Internal(msg) => (StatusCode::INTERNAL_SERVER_ERROR, msg.clone()),
+            AppError::JsonError(e) => (StatusCode::INTERNAL_SERVER_ERROR, format!("JSON Error: {}", e)),
+            AppError::IoError(e) => (StatusCode::INTERNAL_SERVER_ERROR, format!("I/O Error: {}", e)),
         };
 
         let body = Json(json!({