gotham_restful 0.9.1

use super::{handle_error, IntoResponse, ResourceError};
#[cfg(feature = "openapi")]
use crate::ResponseSchema;
use crate::{Response, ResponseBody, Success};
use futures_core::future::Future;
use gotham::{
	anyhow::Error,
	hyper::StatusCode,
	mime::{Mime, APPLICATION_JSON}
};
#[cfg(feature = "openapi")]
use openapi_type::{OpenapiSchema, OpenapiType};
use std::{fmt::Debug, pin::Pin};

pub trait IntoResponseError {
	type Err: Debug + Send + 'static;

	fn into_response_error(self) -> Result<Response, Self::Err>;

	#[cfg(feature = "openapi")]
	fn status_codes() -> Vec<StatusCode>;

	#[cfg(feature = "openapi")]
	fn schema(code: StatusCode) -> OpenapiSchema;
}

impl<E> IntoResponseError for E
where
	E: Into<Error>
{
	type Err = serde_json::Error;

	fn into_response_error(self) -> Result<Response, Self::Err> {
		let err: Error = self.into();
		let err: ResourceError = err.into();
		Ok(Response::json(
			StatusCode::INTERNAL_SERVER_ERROR,
			serde_json::to_string(&err)?
		))
	}

	#[cfg(feature = "openapi")]
	fn status_codes() -> Vec<StatusCode> {
		vec![StatusCode::INTERNAL_SERVER_ERROR]
	}

	#[cfg(feature = "openapi")]
	fn schema(code: StatusCode) -> OpenapiSchema {
		assert_eq!(code, StatusCode::INTERNAL_SERVER_ERROR);
		ResourceError::schema()
	}
}

impl<R, E> IntoResponse for Result<R, E>
where
	R: ResponseBody,
	E: Debug + IntoResponseError<Err = serde_json::Error>
{
	type Err = E::Err;

	fn into_response(self) -> Pin<Box<dyn Future<Output = Result<Response, E::Err>> + Send>> {
		match self {
			Ok(r) => Success::from(r).into_response(),
			Err(e) => handle_error(e)
		}
	}

	fn accepted_types() -> Option<Vec<Mime>> {
		Some(vec![APPLICATION_JSON])
	}
}

#[cfg(feature = "openapi")]
impl<R, E> ResponseSchema for Result<R, E>
where
	R: ResponseBody,
	E: Debug + IntoResponseError<Err = serde_json::Error>
{
	fn status_codes() -> Vec<StatusCode> {
		let mut status_codes = E::status_codes();
		status_codes.push(StatusCode::OK);
		status_codes
	}

	fn schema(code: StatusCode) -> OpenapiSchema {
		match code {
			StatusCode::OK => R::schema(),
			code => E::schema(code)
		}
	}
}

#[cfg(test)]
mod test {
	use super::*;
	use crate::response::OrAllTypes;
	use futures_executor::block_on;
	use thiserror::Error;

	#[derive(Debug, Default, Deserialize, Serialize)]
	#[cfg_attr(feature = "openapi", derive(openapi_type::OpenapiType))]
	struct Msg {
		msg: String
	}

	#[derive(Debug, Default, Error)]
	#[error("An Error")]
	struct MsgError;

	#[test]
	fn result_ok() {
		let ok: Result<Msg, MsgError> = Ok(Msg::default());
		let res = block_on(ok.into_response()).expect("didn't expect error response");
		assert_eq!(res.status, StatusCode::OK);
		assert_eq!(res.mime, Some(APPLICATION_JSON));
		assert_eq!(res.full_body().unwrap(), br#"{"msg":""}"#);
	}

	#[test]
	fn result_err() {
		let err: Result<Msg, MsgError> = Err(MsgError);
		let res = block_on(err.into_response()).expect("didn't expect error response");
		assert_eq!(res.status, StatusCode::INTERNAL_SERVER_ERROR);
		assert_eq!(res.mime, Some(APPLICATION_JSON));
		assert_eq!(
			res.full_body().unwrap(),
			format!(r#"{{"error":true,"message":"{}"}}"#, MsgError).as_bytes()
		);
	}

	#[test]
	fn success_accepts_json() {
		assert!(<Result<Msg, MsgError>>::accepted_types()
			.or_all_types()
			.contains(&APPLICATION_JSON))
	}
}