Actix: extract querystring from form data (#98)

* Deprecate support for actix-web 2.0

* Update actix.rs

Added QsForm to support application/x-www-form-urlencoded Web forms

* Update actix.rs with working adjustments

Added Into_inner function for both QsQuery and QsForm to behave like actix_webs default extractors
Made some fixes

* Added missing code to actix.rs for QsForm

* Update actix.rs

Added new trait "IntoInner"
Fixed QsFormConfig not correctly setting new settings correctly

* Update actix.rs

Removed trait requirement for using into_inner() now functions as a function.

* Update src/actix.rs

* Remove redundant config, add tests

* Add changelog

* Bump serde qs version

* Add Debug bound to docs example

---------

Co-authored-by: nMessage <135612238+nMessage@users.noreply.github.com>

3 files changed, 136 insertions, 30 deletions

diff --git a/src/actix.rs b/src/actix.rs
index a185212..176ce7d 100644
--- a/src/actix.rs
+++ b/src/actix.rs
@@ -5,25 +5,25 @@
 use crate::de::Config as QsConfig;
 use crate::error::Error as QsError;
 
-#[cfg(feature = "actix2")]
-use actix_web2 as actix_web;
 #[cfg(feature = "actix3")]
 use actix_web3 as actix_web;
 #[cfg(feature = "actix4")]
 use actix_web4 as actix_web;
 
 use actix_web::dev::Payload;
-#[cfg(any(feature = "actix2", feature = "actix3"))]
+#[cfg(feature = "actix3")]
 use actix_web::HttpResponse;
-use actix_web::{Error as ActixError, FromRequest, HttpRequest, ResponseError};
-use futures::future::{ready, Ready};
+use actix_web::{web, Error as ActixError, FromRequest, HttpRequest, ResponseError};
+use futures::future::{ready, FutureExt, LocalBoxFuture, Ready};
+use futures::StreamExt;
 use serde::de;
+use serde::de::DeserializeOwned;
 use std::fmt;
 use std::fmt::{Debug, Display};
 use std::ops::{Deref, DerefMut};
 use std::sync::Arc;
 
-#[cfg(any(feature = "actix2", feature = "actix3"))]
+#[cfg(feature = "actix3")]
 impl ResponseError for QsError {
     fn error_response(&self) -> HttpResponse {
         HttpResponse::BadRequest().finish()
@@ -48,8 +48,6 @@ impl ResponseError for QsError {
 /// # use actix_web4 as actix_web;
 /// # #[cfg(feature = "actix3")]
 /// # use actix_web3 as actix_web;
-/// # #[cfg(feature = "actix2")]
-/// # use actix_web2 as actix_web;
 /// use actix_web::{web, App, HttpResponse};
 /// use serde_qs::actix::QsQuery;
 ///
@@ -74,6 +72,12 @@ impl ResponseError for QsError {
 /// ```
 pub struct QsQuery<T>(T);
 
+impl<T> QsQuery<T> {
+    /// Unwrap into inner T value
+    pub fn into_inner(self) -> T {
+        self.0
+    }
+}
 impl<T> Deref for QsQuery<T> {
     type Target = T;
 
@@ -88,13 +92,6 @@ impl<T> DerefMut for QsQuery<T> {
     }
 }
 
-impl<T> QsQuery<T> {
-    /// Deconstruct to a inner value
-    pub fn into_inner(self) -> T {
-        self.0
-    }
-}
-
 impl<T: Debug> Debug for QsQuery<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
         self.0.fmt(f)
@@ -113,25 +110,19 @@ where
 {
     type Error = ActixError;
     type Future = Ready<Result<Self, ActixError>>;
-    #[cfg(any(feature = "actix2", feature = "actix3"))]
+    #[cfg(feature = "actix3")]
     type Config = QsQueryConfig;
 
     #[inline]
     fn from_request(req: &HttpRequest, _: &mut Payload) -> Self::Future {
-        let query_config = req.app_data::<QsQueryConfig>();
-
-        let error_handler = query_config.map(|c| c.ehandler.clone()).unwrap_or(None);
-
-        let default_qsconfig = QsConfig::default();
-        let qsconfig = query_config
-            .map(|c| &c.qs_config)
-            .unwrap_or(&default_qsconfig);
+        let query_config = req.app_data::<QsQueryConfig>().unwrap_or(&DEFAULT_CONFIG);
 
-        let res = qsconfig
+        let res = query_config
+            .qs_config
             .deserialize_str::<T>(req.query_string())
             .map(|val| Ok(QsQuery(val)))
             .unwrap_or_else(move |e| {
-                let e = if let Some(error_handler) = error_handler {
+                let e = if let Some(error_handler) = &query_config.ehandler {
                     (error_handler)(e, req)
                 } else {
                     e.into()
@@ -151,8 +142,6 @@ where
 /// # use actix_web4 as actix_web;
 /// # #[cfg(feature = "actix3")]
 /// # use actix_web3 as actix_web;
-/// # #[cfg(feature = "actix2")]
-/// # use actix_web2 as actix_web;
 /// use actix_web::{error, web, App, FromRequest, HttpResponse};
 /// use serde_qs::actix::QsQuery;
 /// use serde_qs::Config as QsConfig;
@@ -184,11 +173,17 @@ where
 ///     );
 /// }
 /// ```
+#[derive(Clone)]
 pub struct QsQueryConfig {
     ehandler: Option<Arc<dyn Fn(QsError, &HttpRequest) -> ActixError + Send + Sync>>,
     qs_config: QsConfig,
 }
 
+static DEFAULT_CONFIG: QsQueryConfig = QsQueryConfig {
+    ehandler: None,
+    qs_config: crate::de::DEFAULT_CONFIG,
+};
+
 impl QsQueryConfig {
     /// Set custom error handler
     pub fn error_handler<F>(mut self, f: F) -> Self
@@ -214,3 +209,103 @@ impl Default for QsQueryConfig {
         }
     }
 }
+
+#[derive(PartialEq, Eq, PartialOrd, Ord)]
+/// Extract typed information from from the request's form data.
+///
+/// ## Example
+///
+/// ```rust
+/// # #[macro_use] extern crate serde_derive;
+/// # #[cfg(feature = "actix4")]
+/// # use actix_web4 as actix_web;
+/// # #[cfg(feature = "actix3")]
+/// # use actix_web3 as actix_web;
+/// use actix_web::{web, App, HttpResponse};
+/// use serde_qs::actix::QsForm;
+///
+/// #[derive(Debug, Deserialize)]
+/// pub struct UsersFilter {
+///    id: Vec<u64>,
+/// }
+///
+/// // Use `QsForm` extractor for Form information.
+/// // Content-Type:	application/x-www-form-urlencoded
+/// // The correct request payload for this handler would be `id[]=1124&id[]=88`
+/// async fn filter_users(info: QsForm<UsersFilter>) -> HttpResponse {
+///     HttpResponse::Ok().body(
+///         info.id.iter().map(|i| i.to_string()).collect::<Vec<String>>().join(", ")
+///     )
+/// }
+///
+/// fn main() {
+///     let app = App::new().service(
+///        web::resource("/users")
+///            .route(web::get().to(filter_users)));
+/// }
+/// ```
+#[derive(Debug)]
+pub struct QsForm<T>(T);
+
+impl<T> QsForm<T> {
+    /// Unwrap into inner T value
+    pub fn into_inner(self) -> T {
+        self.0
+    }
+}
+
+impl<T> Deref for QsForm<T> {
+    type Target = T;
+
+    fn deref(&self) -> &T {
+        &self.0
+    }
+}
+
+impl<T> DerefMut for QsForm<T> {
+    fn deref_mut(&mut self) -> &mut T {
+        &mut self.0
+    }
+}
+
+impl<T> FromRequest for QsForm<T>
+where
+    T: DeserializeOwned + Debug,
+{
+    type Error = ActixError;
+    type Future = LocalBoxFuture<'static, Result<Self, ActixError>>;
+    #[cfg(feature = "actix3")]
+    type Config = QsQueryConfig;
+
+    fn from_request(req: &HttpRequest, payload: &mut Payload) -> Self::Future {
+        let mut stream = payload.take();
+        let req_clone = req.clone();
+
+        let query_config: QsQueryConfig = req
+            .app_data::<QsQueryConfig>()
+            .unwrap_or(&DEFAULT_CONFIG)
+            .clone();
+        async move {
+            let mut bytes = web::BytesMut::new();
+
+            while let Some(item) = stream.next().await {
+                bytes.extend_from_slice(&item.unwrap());
+            }
+
+            query_config
+                .qs_config
+                .deserialize_bytes::<T>(&bytes)
+                .map(|val| Ok(QsForm(val)))
+                .unwrap_or_else(|e| {
+                    let e = if let Some(error_handler) = &query_config.ehandler {
+                        (error_handler)(e, &req_clone)
+                    } else {
+                        e.into()
+                    };
+
+                    Err(e)
+                })
+        }
+        .boxed_local()
+    }
+}
diff --git a/src/de/mod.rs b/src/de/mod.rs
index 290d843..f882ae7 100644
--- a/src/de/mod.rs
+++ b/src/de/mod.rs
@@ -80,6 +80,7 @@ use std::collections::btree_map::{BTreeMap, Entry, IntoIter};
 /// assert_eq!(map.get("a").unwrap().get("b").unwrap().get("c").unwrap(), "1");
 /// ```
 ///
+#[derive(Clone, Copy)]
 pub struct Config {
     /// Specifies the maximum depth key that `serde_qs` will attempt to
     /// deserialize. Default is 5.
@@ -88,9 +89,14 @@ pub struct Config {
     strict: bool,
 }
 
+pub const DEFAULT_CONFIG: Config = Config {
+    max_depth: 5,
+    strict: true,
+};
+
 impl Default for Config {
     fn default() -> Self {
-        Self::new(5, true)
+        DEFAULT_CONFIG
     }
 }
 
diff --git a/src/lib.rs b/src/lib.rs
index a21c5f2..e816839 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -186,7 +186,7 @@
 #[macro_use]
 extern crate serde;
 
-#[cfg(any(feature = "actix4", feature = "actix3", feature = "actix2"))]
+#[cfg(any(feature = "actix4", feature = "actix3"))]
 pub mod actix;
 
 #[cfg(feature = "actix")]
@@ -201,6 +201,11 @@ serde_qs = { version = "0.9", features = ["actix4"] }
 "#
 );
 
+#[cfg(feature = "actix2")]
+compile_error!(
+    r#"The `actix2` feature was removed in v0.13 due to CI issues and minimal interest in continuing support"#
+);
+
 mod de;
 mod error;
 mod ser;