improve error type

src/models/errors.rs

 use serde::Serialize;
 use rocket::http::Status;
-use rocket::request::Request;
+use rocket::request::{Request, Outcome};
 use rocket::response::{self, Response, Responder};
 use rocket_contrib::json::Json;
 use crate::models::users::UserError;
+use serde_json::Value;
+
 
 #[derive(Serialize, Debug)]
-pub struct ErrorResponse<T> {
+pub struct ErrorResponse {
     #[serde(with = "StatusDef")]
     #[serde(flatten)]
     pub status: Status,
     pub message: String,
     #[serde(skip_serializing_if = "Option::is_none")]
-    pub details: Option<T>
+    pub details: Option<Value>
 }
 
 #[derive(Serialize)]
@@ -23,8 +25,8 @@ struct StatusDef {
     reason: &'static str,
 }
 
-impl<T> ErrorResponse<T> {
-    pub fn new(status: Status, message: String) -> ErrorResponse<T> {
+impl ErrorResponse {
+    pub fn new(status: Status, message: String) -> ErrorResponse {
         ErrorResponse {
             status,
             message,
@@ -32,26 +34,26 @@ impl<T> ErrorResponse<T> {
         }
     }
 
-    pub fn with_details(self, details: T) -> ErrorResponse<T> {
+    pub fn with_details<T: Serialize> (self, details: T) -> ErrorResponse {
         ErrorResponse {
-            details: Some(details),
+            details: serde_json::to_value(details).ok(),
             ..self
         }
     }
 
-    pub fn err<R>(self) -> Result<R, ErrorResponse<T>> {
+    pub fn err<R>(self) -> Result<R, ErrorResponse> {
         Err(self)
     }
 }
 
-impl<'r, T: Serialize> Responder<'r, 'static> for ErrorResponse<T> {
+impl<'r> Responder<'r, 'static> for ErrorResponse {
     fn respond_to(self, req: &'r Request<'_>) -> response::Result<'static> {
         let status = self.status;
         Response::build_from(Json(self).respond_to(req)?).status(status).ok()
     }
 }
 
-impl From<UserError> for ErrorResponse<()> {
+impl From<UserError> for ErrorResponse {
     fn from(e: UserError) -> Self {
         match e {
             UserError::NotFound => ErrorResponse::new(Status::Unauthorized, "Provided credentials or token do not match any existing user".into()),
@@ -66,7 +68,15 @@ impl From<UserError> for ErrorResponse<()> {
     }
 }
 
-pub fn make_500<E: std::fmt::Debug>(e: E) -> ErrorResponse<()> {
+
+impl<S> Into<Outcome<S, ErrorResponse>> for ErrorResponse {
+    fn into(self) -> Outcome<S, ErrorResponse> {
+        Outcome::Failure((self.status.clone(), self))
+    }
+}
+
+
+pub fn make_500<E: std::fmt::Debug>(e: E) -> ErrorResponse {
     println!("{:?}", e);
     ErrorResponse::new(Status::InternalServerError, "An unexpected error occured.".into())
 }

src/models/users.rs

@@ -4,7 +4,6 @@ use diesel::result::Error as DieselError;
 use diesel_derive_enum::DbEnum;
 use rocket::{State, request::{FromRequest, Request, Outcome}};
 use serde::{Serialize, Deserialize};
-use rocket::http::Status;
 use chrono::serde::ts_seconds;
 use chrono::prelude::{DateTime, Utc};
 use chrono::Duration;
@@ -21,6 +20,7 @@ use jsonwebtoken::{
 use crate::schema::*;
 use crate::DbConn;
 use crate::config::Config;
+use crate::models::errors::ErrorResponse;
 
 
 const BEARER: &'static str = "Bearer ";
@@ -95,7 +95,7 @@ pub struct UserInfo {
 
 #[rocket::async_trait]
 impl<'r> FromRequest<'r> for UserInfo {
-    type Error = UserError;
+    type Error = ErrorResponse;
 
     async fn from_request(request: &'r Request<'_>) -> Outcome<Self, Self::Error> {
         let auth_header = match request.headers().get_one(AUTH_HEADER) {
@@ -106,7 +106,7 @@ impl<'r> FromRequest<'r> for UserInfo {
         let token = if auth_header.starts_with(BEARER) {
             auth_header.trim_start_matches(BEARER)
         } else {
-            return Outcome::Failure((Status::BadRequest, UserError::MalformedHeader))
+            return ErrorResponse::from(UserError::MalformedHeader).into()
         };
 
         // TODO: Better error handling
@@ -116,12 +116,12 @@ impl<'r> FromRequest<'r> for UserInfo {
         let token_data = AuthClaims::decode(
             token, &config.web_app.secret
         ).map_err(|e| match e.into_kind() {
-            JwtErrorKind::ExpiredSignature => (Status::Unauthorized, UserError::ExpiredToken),
-            _ => (Status::BadRequest, UserError::BadToken),
+            JwtErrorKind::ExpiredSignature => UserError::ExpiredToken,
+            _ => UserError::BadToken,
         });
 
         let token_data = match token_data {
-            Err(e) => return Outcome::Failure(e),
+            Err(e) => return ErrorResponse::from(e).into(),
             Ok(data) => data
         };
 
@@ -129,8 +129,8 @@ impl<'r> FromRequest<'r> for UserInfo {
 
         conn.run(|c| {
             match LocalUser::get_user_by_uuid(c, user_id) {
-                Err(UserError::NotFound) => Outcome::Failure((Status::NotFound, UserError::NotFound)),
-                Err(e) => Outcome::Failure((Status::InternalServerError, e)),
+                Err(UserError::NotFound) => ErrorResponse::from(UserError::NotFound).into(),
+                Err(e) => ErrorResponse::from(e).into(),
                 Ok(d) => Outcome::Success(d),
             }
         }).await

src/routes/users.rs

@@ -13,7 +13,7 @@ pub async fn create_auth_token(
     conn: DbConn,
     config: State<'_, Config>,
     auth_request: Json<AuthTokenRequest>
-) -> Result<Json<AuthTokenResponse>, ErrorResponse<()>> {
+) -> Result<Json<AuthTokenResponse>, ErrorResponse> {
 
     let user_info = conn.run(move |c| {
         LocalUser::get_user_by_creds(c, &auth_request.username, &auth_request.password)
@@ -27,7 +27,7 @@ pub async fn create_auth_token(
 }
 
 #[post("/users", data = "<user_request>")]
-pub async fn create_user<'r>(conn: DbConn, user_request: Json<CreateUserRequest>) -> Result<Response<'r>, ErrorResponse<()>>{
+pub async fn create_user<'r>(conn: DbConn, user_request: Json<CreateUserRequest>) -> Result<Response<'r>, ErrorResponse>{
     // TODO: Check current user if any to check if user has permission to create users (with or without role)
     let _user_info = conn.run(|c| {
         LocalUser::create_user(&c, user_request.into_inner())

src/routes/zones.rs

@@ -16,9 +16,10 @@ use crate::DnsClient;
 #[get("/zones/<zone>/records")]
 pub fn get_zone_records(
     client: State<DnsClient>,
-    _user_info: UserInfo,
+    user_info: Result<UserInfo, ErrorResponse>,
     zone: String
-) -> Result<Json<Vec<dns::Record>>, ErrorResponse<()>> {
+) -> Result<Json<Vec<dns::Record>>, ErrorResponse> {
+    user_info?;
 
     // TODO: Implement FromParam for Name
     let name = Name::from_utf8(&zone).unwrap();