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/* -------------------------------------------------------------
Limiting Factor :: axum :: API :: replies
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
Project: Nasqueron
License: BSD-2-Clause
------------------------------------------------------------- */
//! # API standard and JSON responses.
//!
//! This module provides useful traits and methods to craft API replies from an existing type.
use axum::http::StatusCode;
use axum::Json;
#[cfg(feature = "serialization")]
use serde::Serialize;
/* -------------------------------------------------------------
JSON responses
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pub type ApiJsonResponse<T> = Result<Json<T>, (StatusCode, Json<String>)>;
/// This trait allows to consume an object into an HTTP response.
pub trait ApiResponse<T> {
/// Consumes the value and creates a JSON or a Status result response.
fn into_json_response(self) -> ApiJsonResponse<T>;
}
impl<T> ApiResponse<T> for Json<T> {
fn into_json_response(self) -> ApiJsonResponse<T> {
Ok(self)
}
}
#[cfg(feature = "serialization")]
impl<T> ApiResponse<T> for T where T: Serialize {
fn into_json_response(self) -> ApiJsonResponse<T> {
Ok(Json(self))
}
}
// -------------------------------------------------------------
// Failures
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pub trait FailureResponse {
fn status_code(&self) -> StatusCode;
fn response(&self) -> String;
}
impl<T, E> ApiResponse<T> for Result<T, E>
where T: ApiResponse<T>, E: FailureResponse
{
fn into_json_response(self) -> ApiJsonResponse<T> {
match self {
Ok(value) => value.into_json_response(),
Err(error) => Err((error.status_code(), Json(error.response())))
}
}
}

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