mirror of
https://github.com/actix/actix-extras.git
synced 2025-02-21 10:04:49 +01:00
655 lines
19 KiB
Rust
655 lines
19 KiB
Rust
//! Json extractor/responder
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use std::future::Future;
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use std::pin::Pin;
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use std::sync::Arc;
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use std::task::{Context, Poll};
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use std::{fmt, ops};
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use bytes::BytesMut;
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use futures::future::{err, ok, FutureExt, LocalBoxFuture, Ready};
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use futures::StreamExt;
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use serde::de::DeserializeOwned;
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use serde::Serialize;
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use serde_json;
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use actix_http::http::{header::CONTENT_LENGTH, StatusCode};
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use actix_http::{HttpMessage, Payload, Response};
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#[cfg(feature = "compress")]
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use crate::dev::Decompress;
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use crate::error::{Error, JsonPayloadError};
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use crate::extract::FromRequest;
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use crate::request::HttpRequest;
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use crate::responder::Responder;
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/// Json helper
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///
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/// Json can be used for two different purpose. First is for json response
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/// generation and second is for extracting typed information from request's
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/// payload.
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///
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/// To extract typed information from request's body, the type `T` must
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/// implement the `Deserialize` trait from *serde*.
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///
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/// [**JsonConfig**](struct.JsonConfig.html) allows to configure extraction
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/// process.
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///
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/// ## Example
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///
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/// ```rust
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/// use actix_web::{web, App};
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/// use serde_derive::Deserialize;
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///
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/// #[derive(Deserialize)]
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/// struct Info {
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/// username: String,
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/// }
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///
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/// /// deserialize `Info` from request's body
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/// async fn index(info: web::Json<Info>) -> String {
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/// format!("Welcome {}!", info.username)
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/// }
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///
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/// fn main() {
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/// let app = App::new().service(
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/// web::resource("/index.html").route(
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/// web::post().to(index))
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/// );
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/// }
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/// ```
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///
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/// The `Json` type allows you to respond with well-formed JSON data: simply
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/// return a value of type Json<T> where T is the type of a structure
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/// to serialize into *JSON*. The type `T` must implement the `Serialize`
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/// trait from *serde*.
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///
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/// ```rust
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/// use actix_web::*;
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/// use serde_derive::Serialize;
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///
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/// #[derive(Serialize)]
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/// struct MyObj {
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/// name: String,
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/// }
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///
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/// fn index(req: HttpRequest) -> Result<web::Json<MyObj>> {
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/// Ok(web::Json(MyObj {
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/// name: req.match_info().get("name").unwrap().to_string(),
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/// }))
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/// }
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/// # fn main() {}
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/// ```
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pub struct Json<T>(pub T);
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impl<T> Json<T> {
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/// Deconstruct to an inner value
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pub fn into_inner(self) -> T {
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self.0
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}
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}
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impl<T> ops::Deref for Json<T> {
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type Target = T;
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fn deref(&self) -> &T {
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&self.0
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}
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}
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impl<T> ops::DerefMut for Json<T> {
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fn deref_mut(&mut self) -> &mut T {
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&mut self.0
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}
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}
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impl<T> fmt::Debug for Json<T>
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where
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T: fmt::Debug,
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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write!(f, "Json: {:?}", self.0)
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}
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}
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impl<T> fmt::Display for Json<T>
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where
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T: fmt::Display,
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{
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fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
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fmt::Display::fmt(&self.0, f)
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}
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}
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impl<T: Serialize> Responder for Json<T> {
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type Error = Error;
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type Future = Ready<Result<Response, Error>>;
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fn respond_to(self, _: &HttpRequest) -> Self::Future {
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let body = match serde_json::to_string(&self.0) {
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Ok(body) => body,
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Err(e) => return err(e.into()),
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};
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ok(Response::build(StatusCode::OK)
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.content_type("application/json")
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.body(body))
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}
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}
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/// Json extractor. Allow to extract typed information from request's
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/// payload.
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///
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/// To extract typed information from request's body, the type `T` must
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/// implement the `Deserialize` trait from *serde*.
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///
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/// [**JsonConfig**](struct.JsonConfig.html) allows to configure extraction
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/// process.
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///
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/// ## Example
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///
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/// ```rust
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/// use actix_web::{web, App};
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/// use serde_derive::Deserialize;
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///
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/// #[derive(Deserialize)]
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/// struct Info {
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/// username: String,
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/// }
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///
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/// /// deserialize `Info` from request's body
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/// async fn index(info: web::Json<Info>) -> String {
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/// format!("Welcome {}!", info.username)
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/// }
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///
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/// fn main() {
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/// let app = App::new().service(
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/// web::resource("/index.html").route(
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/// web::post().to(index))
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/// );
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/// }
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/// ```
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impl<T> FromRequest for Json<T>
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where
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T: DeserializeOwned + 'static,
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{
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type Error = Error;
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type Future = LocalBoxFuture<'static, Result<Self, Error>>;
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type Config = JsonConfig;
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#[inline]
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fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future {
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let req2 = req.clone();
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let (limit, err, ctype) = req
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.app_data::<Self::Config>()
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.map(|c| (c.limit, c.ehandler.clone(), c.content_type.clone()))
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.unwrap_or((32768, None, None));
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JsonBody::new(req, payload, ctype)
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.limit(limit)
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.map(move |res| match res {
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Err(e) => {
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log::debug!(
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"Failed to deserialize Json from payload. \
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Request path: {}",
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req2.path()
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);
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if let Some(err) = err {
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Err((*err)(e, &req2))
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} else {
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Err(e.into())
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}
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}
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Ok(data) => Ok(Json(data)),
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})
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.boxed_local()
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}
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}
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/// Json extractor configuration
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///
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/// ```rust
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/// use actix_web::{error, web, App, FromRequest, HttpResponse};
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/// use serde_derive::Deserialize;
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///
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/// #[derive(Deserialize)]
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/// struct Info {
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/// username: String,
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/// }
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///
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/// /// deserialize `Info` from request's body, max payload size is 4kb
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/// async fn index(info: web::Json<Info>) -> String {
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/// format!("Welcome {}!", info.username)
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/// }
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///
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/// fn main() {
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/// let app = App::new().service(
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/// web::resource("/index.html")
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/// .app_data(
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/// // change json extractor configuration
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/// web::Json::<Info>::configure(|cfg| {
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/// cfg.limit(4096)
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/// .content_type(|mime| { // <- accept text/plain content type
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/// mime.type_() == mime::TEXT && mime.subtype() == mime::PLAIN
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/// })
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/// .error_handler(|err, req| { // <- create custom error response
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/// error::InternalError::from_response(
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/// err, HttpResponse::Conflict().finish()).into()
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/// })
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/// }))
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/// .route(web::post().to(index))
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/// );
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/// }
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/// ```
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#[derive(Clone)]
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pub struct JsonConfig {
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limit: usize,
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ehandler: Option<Arc<dyn Fn(JsonPayloadError, &HttpRequest) -> Error + Send + Sync>>,
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content_type: Option<Arc<dyn Fn(mime::Mime) -> bool + Send + Sync>>,
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}
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impl JsonConfig {
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/// Change max size of payload. By default max size is 32Kb
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pub fn limit(mut self, limit: usize) -> Self {
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self.limit = limit;
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self
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}
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/// Set custom error handler
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pub fn error_handler<F>(mut self, f: F) -> Self
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where
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F: Fn(JsonPayloadError, &HttpRequest) -> Error + Send + Sync + 'static,
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{
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self.ehandler = Some(Arc::new(f));
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self
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}
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/// Set predicate for allowed content types
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pub fn content_type<F>(mut self, predicate: F) -> Self
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where
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F: Fn(mime::Mime) -> bool + Send + Sync + 'static,
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{
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self.content_type = Some(Arc::new(predicate));
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self
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}
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}
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impl Default for JsonConfig {
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fn default() -> Self {
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JsonConfig {
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limit: 32768,
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ehandler: None,
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content_type: None,
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}
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}
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}
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/// Request's payload json parser, it resolves to a deserialized `T` value.
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/// This future could be used with `ServiceRequest` and `ServiceFromRequest`.
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///
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/// Returns error:
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///
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/// * content type is not `application/json`
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/// (unless specified in [`JsonConfig`](struct.JsonConfig.html))
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/// * content length is greater than 256k
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pub struct JsonBody<U> {
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limit: usize,
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length: Option<usize>,
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#[cfg(feature = "compress")]
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stream: Option<Decompress<Payload>>,
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#[cfg(not(feature = "compress"))]
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stream: Option<Payload>,
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err: Option<JsonPayloadError>,
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fut: Option<LocalBoxFuture<'static, Result<U, JsonPayloadError>>>,
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}
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impl<U> JsonBody<U>
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where
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U: DeserializeOwned + 'static,
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{
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/// Create `JsonBody` for request.
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pub fn new(
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req: &HttpRequest,
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payload: &mut Payload,
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ctype: Option<Arc<dyn Fn(mime::Mime) -> bool + Send + Sync>>,
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) -> Self {
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// check content-type
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let json = if let Ok(Some(mime)) = req.mime_type() {
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mime.subtype() == mime::JSON
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|| mime.suffix() == Some(mime::JSON)
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|| ctype.as_ref().map_or(false, |predicate| predicate(mime))
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} else {
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false
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};
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if !json {
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return JsonBody {
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limit: 262_144,
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length: None,
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stream: None,
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fut: None,
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err: Some(JsonPayloadError::ContentType),
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};
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}
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let len = req
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.headers()
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.get(&CONTENT_LENGTH)
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.and_then(|l| l.to_str().ok())
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.and_then(|s| s.parse::<usize>().ok());
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#[cfg(feature = "compress")]
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let payload = Decompress::from_headers(payload.take(), req.headers());
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#[cfg(not(feature = "compress"))]
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let payload = payload.take();
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JsonBody {
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limit: 262_144,
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length: len,
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stream: Some(payload),
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fut: None,
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err: None,
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}
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}
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/// Change max size of payload. By default max size is 256Kb
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pub fn limit(mut self, limit: usize) -> Self {
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self.limit = limit;
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self
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}
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}
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impl<U> Future for JsonBody<U>
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where
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U: DeserializeOwned + 'static,
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{
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type Output = Result<U, JsonPayloadError>;
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fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
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if let Some(ref mut fut) = self.fut {
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return Pin::new(fut).poll(cx);
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}
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if let Some(err) = self.err.take() {
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return Poll::Ready(Err(err));
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}
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let limit = self.limit;
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if let Some(len) = self.length.take() {
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if len > limit {
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return Poll::Ready(Err(JsonPayloadError::Overflow));
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}
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}
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let mut stream = self.stream.take().unwrap();
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self.fut = Some(
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async move {
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let mut body = BytesMut::with_capacity(8192);
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while let Some(item) = stream.next().await {
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let chunk = item?;
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if (body.len() + chunk.len()) > limit {
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return Err(JsonPayloadError::Overflow);
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} else {
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body.extend_from_slice(&chunk);
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}
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}
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Ok(serde_json::from_slice::<U>(&body)?)
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}
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.boxed_local(),
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);
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self.poll(cx)
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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 bytes::Bytes;
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use serde_derive::{Deserialize, Serialize};
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use super::*;
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use crate::error::InternalError;
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use crate::http::header;
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use crate::test::{load_stream, TestRequest};
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use crate::HttpResponse;
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#[derive(Serialize, Deserialize, PartialEq, Debug)]
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struct MyObject {
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name: String,
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}
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fn json_eq(err: JsonPayloadError, other: JsonPayloadError) -> bool {
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match err {
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JsonPayloadError::Overflow => match other {
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JsonPayloadError::Overflow => true,
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_ => false,
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},
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JsonPayloadError::ContentType => match other {
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JsonPayloadError::ContentType => true,
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_ => false,
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},
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_ => false,
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}
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}
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#[actix_rt::test]
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async fn test_responder() {
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let req = TestRequest::default().to_http_request();
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let j = Json(MyObject {
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name: "test".to_string(),
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});
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let resp = j.respond_to(&req).await.unwrap();
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assert_eq!(resp.status(), StatusCode::OK);
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assert_eq!(
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resp.headers().get(header::CONTENT_TYPE).unwrap(),
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header::HeaderValue::from_static("application/json")
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);
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use crate::responder::tests::BodyTest;
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assert_eq!(resp.body().bin_ref(), b"{\"name\":\"test\"}");
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}
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#[actix_rt::test]
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async fn test_custom_error_responder() {
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let (req, mut pl) = TestRequest::default()
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.header(
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header::CONTENT_TYPE,
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header::HeaderValue::from_static("application/json"),
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)
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.header(
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header::CONTENT_LENGTH,
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header::HeaderValue::from_static("16"),
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)
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.set_payload(Bytes::from_static(b"{\"name\": \"test\"}"))
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.app_data(JsonConfig::default().limit(10).error_handler(|err, _| {
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let msg = MyObject {
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name: "invalid request".to_string(),
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};
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let resp = HttpResponse::BadRequest()
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.body(serde_json::to_string(&msg).unwrap());
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InternalError::from_response(err, resp).into()
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}))
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.to_http_parts();
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let s = Json::<MyObject>::from_request(&req, &mut pl).await;
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let mut resp = Response::from_error(s.err().unwrap().into());
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assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
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let body = load_stream(resp.take_body()).await.unwrap();
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let msg: MyObject = serde_json::from_slice(&body).unwrap();
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assert_eq!(msg.name, "invalid request");
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}
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#[actix_rt::test]
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async fn test_extract() {
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let (req, mut pl) = TestRequest::default()
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.header(
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header::CONTENT_TYPE,
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header::HeaderValue::from_static("application/json"),
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)
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.header(
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header::CONTENT_LENGTH,
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header::HeaderValue::from_static("16"),
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)
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.set_payload(Bytes::from_static(b"{\"name\": \"test\"}"))
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.to_http_parts();
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let s = Json::<MyObject>::from_request(&req, &mut pl).await.unwrap();
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assert_eq!(s.name, "test");
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assert_eq!(
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s.into_inner(),
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MyObject {
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name: "test".to_string()
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}
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);
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let (req, mut pl) = TestRequest::default()
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.header(
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header::CONTENT_TYPE,
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header::HeaderValue::from_static("application/json"),
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)
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.header(
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header::CONTENT_LENGTH,
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header::HeaderValue::from_static("16"),
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)
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.set_payload(Bytes::from_static(b"{\"name\": \"test\"}"))
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.app_data(JsonConfig::default().limit(10))
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.to_http_parts();
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let s = Json::<MyObject>::from_request(&req, &mut pl).await;
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assert!(format!("{}", s.err().unwrap())
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.contains("Json payload size is bigger than allowed"));
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let (req, mut pl) = TestRequest::default()
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.header(
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header::CONTENT_TYPE,
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header::HeaderValue::from_static("application/json"),
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)
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.header(
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header::CONTENT_LENGTH,
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header::HeaderValue::from_static("16"),
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)
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.set_payload(Bytes::from_static(b"{\"name\": \"test\"}"))
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.app_data(
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JsonConfig::default()
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.limit(10)
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.error_handler(|_, _| JsonPayloadError::ContentType.into()),
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)
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.to_http_parts();
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let s = Json::<MyObject>::from_request(&req, &mut pl).await;
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assert!(format!("{}", s.err().unwrap()).contains("Content type error"));
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}
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#[actix_rt::test]
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async fn test_json_body() {
|
|
let (req, mut pl) = TestRequest::default().to_http_parts();
|
|
let json = JsonBody::<MyObject>::new(&req, &mut pl, None).await;
|
|
assert!(json_eq(json.err().unwrap(), JsonPayloadError::ContentType));
|
|
|
|
let (req, mut pl) = TestRequest::default()
|
|
.header(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static("application/text"),
|
|
)
|
|
.to_http_parts();
|
|
let json = JsonBody::<MyObject>::new(&req, &mut pl, None).await;
|
|
assert!(json_eq(json.err().unwrap(), JsonPayloadError::ContentType));
|
|
|
|
let (req, mut pl) = TestRequest::default()
|
|
.header(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static("application/json"),
|
|
)
|
|
.header(
|
|
header::CONTENT_LENGTH,
|
|
header::HeaderValue::from_static("10000"),
|
|
)
|
|
.to_http_parts();
|
|
|
|
let json = JsonBody::<MyObject>::new(&req, &mut pl, None)
|
|
.limit(100)
|
|
.await;
|
|
assert!(json_eq(json.err().unwrap(), JsonPayloadError::Overflow));
|
|
|
|
let (req, mut pl) = TestRequest::default()
|
|
.header(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static("application/json"),
|
|
)
|
|
.header(
|
|
header::CONTENT_LENGTH,
|
|
header::HeaderValue::from_static("16"),
|
|
)
|
|
.set_payload(Bytes::from_static(b"{\"name\": \"test\"}"))
|
|
.to_http_parts();
|
|
|
|
let json = JsonBody::<MyObject>::new(&req, &mut pl, None).await;
|
|
assert_eq!(
|
|
json.ok().unwrap(),
|
|
MyObject {
|
|
name: "test".to_owned()
|
|
}
|
|
);
|
|
}
|
|
|
|
#[actix_rt::test]
|
|
async fn test_with_json_and_bad_content_type() {
|
|
let (req, mut pl) = TestRequest::with_header(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static("text/plain"),
|
|
)
|
|
.header(
|
|
header::CONTENT_LENGTH,
|
|
header::HeaderValue::from_static("16"),
|
|
)
|
|
.set_payload(Bytes::from_static(b"{\"name\": \"test\"}"))
|
|
.app_data(JsonConfig::default().limit(4096))
|
|
.to_http_parts();
|
|
|
|
let s = Json::<MyObject>::from_request(&req, &mut pl).await;
|
|
assert!(s.is_err())
|
|
}
|
|
|
|
#[actix_rt::test]
|
|
async fn test_with_json_and_good_custom_content_type() {
|
|
let (req, mut pl) = TestRequest::with_header(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static("text/plain"),
|
|
)
|
|
.header(
|
|
header::CONTENT_LENGTH,
|
|
header::HeaderValue::from_static("16"),
|
|
)
|
|
.set_payload(Bytes::from_static(b"{\"name\": \"test\"}"))
|
|
.app_data(JsonConfig::default().content_type(|mime: mime::Mime| {
|
|
mime.type_() == mime::TEXT && mime.subtype() == mime::PLAIN
|
|
}))
|
|
.to_http_parts();
|
|
|
|
let s = Json::<MyObject>::from_request(&req, &mut pl).await;
|
|
assert!(s.is_ok())
|
|
}
|
|
|
|
#[actix_rt::test]
|
|
async fn test_with_json_and_bad_custom_content_type() {
|
|
let (req, mut pl) = TestRequest::with_header(
|
|
header::CONTENT_TYPE,
|
|
header::HeaderValue::from_static("text/html"),
|
|
)
|
|
.header(
|
|
header::CONTENT_LENGTH,
|
|
header::HeaderValue::from_static("16"),
|
|
)
|
|
.set_payload(Bytes::from_static(b"{\"name\": \"test\"}"))
|
|
.app_data(JsonConfig::default().content_type(|mime: mime::Mime| {
|
|
mime.type_() == mime::TEXT && mime.subtype() == mime::PLAIN
|
|
}))
|
|
.to_http_parts();
|
|
|
|
let s = Json::<MyObject>::from_request(&req, &mut pl).await;
|
|
assert!(s.is_err())
|
|
}
|
|
}
|