128 lines
3.6 KiB
Rust
128 lines
3.6 KiB
Rust
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use crate::error::{LemmyError, LemmyErrorType};
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use actix_web::{
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dev::ServiceResponse,
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http::header,
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middleware::ErrorHandlerResponse,
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HttpResponse,
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};
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pub fn jsonify_plain_text_errors<BODY>(
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res: ServiceResponse<BODY>,
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) -> actix_web::Result<ErrorHandlerResponse<BODY>> {
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let maybe_error = res.response().error();
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// This function is only expected to be called for errors, so if there is no error, return
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if maybe_error.is_none() {
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return Ok(ErrorHandlerResponse::Response(res.map_into_left_body()));
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}
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// We're assuming that any LemmyError is already in JSON format, so we don't need to do anything
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if maybe_error
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.expect("http responses with 400-599 statuses should have an error object")
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.as_error::<LemmyError>()
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.is_some()
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{
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return Ok(ErrorHandlerResponse::Response(res.map_into_left_body()));
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}
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let (req, res) = res.into_parts();
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let error = res
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.error()
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.expect("expected an error object in the response");
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let response = HttpResponse::build(res.status())
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.append_header(header::ContentType::json())
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.json(LemmyErrorType::Unknown(error.to_string()));
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let service_response = ServiceResponse::new(req, response);
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Ok(ErrorHandlerResponse::Response(
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service_response.map_into_right_body(),
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))
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}
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#[cfg(test)]
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mod tests {
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use super::*;
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use crate::error::{LemmyError, LemmyErrorType};
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use actix_web::{
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error::ErrorInternalServerError,
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middleware::ErrorHandlers,
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test,
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web,
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App,
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Error,
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Handler,
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Responder,
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};
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use http::StatusCode;
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#[actix_web::test]
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async fn test_non_error_responses_are_not_modified() {
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async fn ok_service() -> actix_web::Result<String, Error> {
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Ok("Oll Korrect".to_string())
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}
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check_for_jsonification(ok_service, StatusCode::OK, "Oll Korrect").await;
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}
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#[actix_web::test]
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async fn test_lemmy_errors_are_not_modified() {
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async fn lemmy_error_service() -> actix_web::Result<String, LemmyError> {
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Err(LemmyError::from(LemmyErrorType::EmailAlreadyExists))
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}
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check_for_jsonification(
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lemmy_error_service,
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StatusCode::BAD_REQUEST,
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"{\"error\":\"email_already_exists\"}",
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)
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.await;
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}
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#[actix_web::test]
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async fn test_generic_errors_are_jsonified_as_unknown_errors() {
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async fn generic_error_service() -> actix_web::Result<String, Error> {
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Err(ErrorInternalServerError("This is not a LemmyError"))
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}
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check_for_jsonification(
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generic_error_service,
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StatusCode::INTERNAL_SERVER_ERROR,
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"{\"error\":\"unknown\",\"message\":\"This is not a LemmyError\"}",
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)
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.await;
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}
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#[actix_web::test]
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async fn test_anyhow_errors_wrapped_in_lemmy_errors_are_jsonified_correctly() {
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async fn anyhow_error_service() -> actix_web::Result<String, LemmyError> {
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Err(LemmyError::from(anyhow::anyhow!("This is the inner error")))
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}
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check_for_jsonification(
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anyhow_error_service,
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StatusCode::BAD_REQUEST,
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"{\"error\":\"unknown\",\"message\":\"This is the inner error\"}",
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)
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.await;
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}
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async fn check_for_jsonification(
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service: impl Handler<(), Output = impl Responder + 'static>,
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expected_status_code: StatusCode,
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expected_body: &str,
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) {
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let app = test::init_service(
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App::new()
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.wrap(ErrorHandlers::new().default_handler(jsonify_plain_text_errors))
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.route("/", web::get().to(service)),
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)
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.await;
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let req = test::TestRequest::default().to_request();
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let res = test::call_service(&app, req).await;
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assert_eq!(res.status(), expected_status_code);
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let body = test::read_body(res).await;
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assert_eq!(body, expected_body);
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}
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}
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