decode reserved characters when extracting path with configuration (#577)

* decode reserved characters when extracting path with configuration * remove useless clone * add a method to get decoded parameter by name
2024-11-23 16:21:06 +01:00 · 2018-11-24 14:54:11 +01:00 · 2018-11-24 14:54:11 +01:00 · c386353337
commit c386353337
parent 9aab382ea8
7 changed files with 234 additions and 79 deletions
--- a/CHANGES.md
+++ b/CHANGES.md
@ -8,6 +8,12 @@

 * `QueryConfig` and `PathConfig` are made public.

+### Added
+
+* By default, `Path` extractor now percent decode all characters. This behaviour can be disabled
+  with `PathConfig::default().disable_decoding()`
+
+
 ## [0.7.14] - 2018-11-14

 ### Added
@ -16,6 +22,9 @@

 * Add method to configure `SameSite` option in `CookieIdentityPolicy`.

+* By default, `Path` extractor now percent decode all characters. This behaviour can be disabled
+  with `PathConfig::default().disable_decoding()`
+

 ### Fixed

--- a/MIGRATION.md
+++ b/MIGRATION.md
@ -1,3 +1,31 @@
+## 0.7.15
+
+* The `' '` character is not percent decoded anymore before matching routes. If you need to use it in
+  your routes, you should use `%20`.
+
+  instead of
+
+    ```rust
+    fn main() {
+         let app = App::new().resource("/my index", |r| {
+             r.method(http::Method::GET)
+                    .with(index);
+         });
+    }
+    ```
+
+  use
+
+    ```rust
+    fn main() {
+         let app = App::new().resource("/my%20index", |r| {
+             r.method(http::Method::GET)
+                    .with(index);
+         });
+    }
+    ```
+
+
 ## 0.7.4

 * `Route::with_config()`/`Route::with_async_config()` always passes configuration objects as tuple
--- a/src/de.rs
+++ b/src/de.rs
@ -1,7 +1,10 @@
+use std::rc::Rc;
+
 use serde::de::{self, Deserializer, Error as DeError, Visitor};

 use httprequest::HttpRequest;
 use param::ParamsIter;
+use uri::RESERVED_QUOTER;

 macro_rules! unsupported_type {
    ($trait_fn:ident, $name:expr) => {
@ -13,6 +16,20 @@ macro_rules! unsupported_type {
    };
 }

+macro_rules! percent_decode_if_needed {
+    ($value:expr, $decode:expr) => {
+        if $decode {
+            if let Some(ref mut value) = RESERVED_QUOTER.requote($value.as_bytes()) {
+                Rc::make_mut(value).parse()
+            } else {
+                $value.parse()
+            }
+        } else {
+            $value.parse()
+        }
+    }
+}
+
 macro_rules! parse_single_value {
    ($trait_fn:ident, $visit_fn:ident, $tp:tt) => {
        fn $trait_fn<V>(self, visitor: V) -> Result<V::Value, Self::Error>
@ -23,11 +40,11 @@ macro_rules! parse_single_value {
                    format!("wrong number of parameters: {} expected 1",
                            self.req.match_info().len()).as_str()))
            } else {
-                let v = self.req.match_info()[0].parse().map_err(
-                    |_| de::value::Error::custom(
-                        format!("can not parse {:?} to a {}",
-                                &self.req.match_info()[0], $tp)))?;
-                visitor.$visit_fn(v)
+                let v_parsed = percent_decode_if_needed!(&self.req.match_info()[0], self.decode)
+                    .map_err(|_| de::value::Error::custom(
+                        format!("can not parse {:?} to a {}", &self.req.match_info()[0], $tp)
+                    ))?;
+                visitor.$visit_fn(v_parsed)
            }
        }
    }
@ -35,11 +52,12 @@ macro_rules! parse_single_value {

 pub struct PathDeserializer<'de, S: 'de> {
    req: &'de HttpRequest<S>,
+    decode: bool,
 }

 impl<'de, S: 'de> PathDeserializer<'de, S> {
-    pub fn new(req: &'de HttpRequest<S>) -> Self {
-        PathDeserializer { req }
+    pub fn new(req: &'de HttpRequest<S>, decode: bool) -> Self {
+        PathDeserializer { req, decode }
    }
 }

@ -53,6 +71,7 @@ impl<'de, S: 'de> Deserializer<'de> for PathDeserializer<'de, S> {
        visitor.visit_map(ParamsDeserializer {
            params: self.req.match_info().iter(),
            current: None,
+            decode: self.decode,
        })
    }

@ -107,6 +126,7 @@ impl<'de, S: 'de> Deserializer<'de> for PathDeserializer<'de, S> {
        } else {
            visitor.visit_seq(ParamsSeq {
                params: self.req.match_info().iter(),
+                decode: self.decode,
            })
        }
    }
@ -128,6 +148,7 @@ impl<'de, S: 'de> Deserializer<'de> for PathDeserializer<'de, S> {
        } else {
            visitor.visit_seq(ParamsSeq {
                params: self.req.match_info().iter(),
+                decode: self.decode,
            })
        }
    }
@ -141,28 +162,13 @@ impl<'de, S: 'de> Deserializer<'de> for PathDeserializer<'de, S> {
        Err(de::value::Error::custom("unsupported type: enum"))
    }

-    fn deserialize_str<V>(self, visitor: V) -> Result<V::Value, Self::Error>
-    where
-        V: Visitor<'de>,
-    {
-        if self.req.match_info().len() != 1 {
-            Err(de::value::Error::custom(
-                format!(
-                    "wrong number of parameters: {} expected 1",
-                    self.req.match_info().len()
-                ).as_str(),
-            ))
-        } else {
-            visitor.visit_str(&self.req.match_info()[0])
-        }
-    }
-
    fn deserialize_seq<V>(self, visitor: V) -> Result<V::Value, Self::Error>
    where
        V: Visitor<'de>,
    {
        visitor.visit_seq(ParamsSeq {
            params: self.req.match_info().iter(),
+            decode: self.decode,
        })
    }

@ -184,13 +190,16 @@ impl<'de, S: 'de> Deserializer<'de> for PathDeserializer<'de, S> {
    parse_single_value!(deserialize_f32, visit_f32, "f32");
    parse_single_value!(deserialize_f64, visit_f64, "f64");
    parse_single_value!(deserialize_string, visit_string, "String");
+    parse_single_value!(deserialize_str, visit_string, "String");
    parse_single_value!(deserialize_byte_buf, visit_string, "String");
    parse_single_value!(deserialize_char, visit_char, "char");
+
 }

 struct ParamsDeserializer<'de> {
    params: ParamsIter<'de>,
    current: Option<(&'de str, &'de str)>,
+    decode: bool,
 }

 impl<'de> de::MapAccess<'de> for ParamsDeserializer<'de> {
@ -212,7 +221,7 @@ impl<'de> de::MapAccess<'de> for ParamsDeserializer<'de> {
        V: de::DeserializeSeed<'de>,
    {
        if let Some((_, value)) = self.current.take() {
-            seed.deserialize(Value { value })
+            seed.deserialize(Value { value, decode: self.decode })
        } else {
            Err(de::value::Error::custom("unexpected item"))
        }
@ -252,16 +261,18 @@ macro_rules! parse_value {
        fn $trait_fn<V>(self, visitor: V) -> Result<V::Value, Self::Error>
            where V: Visitor<'de>
        {
-            let v = self.value.parse().map_err(
-                |_| de::value::Error::custom(
-                    format!("can not parse {:?} to a {}", self.value, $tp)))?;
-            visitor.$visit_fn(v)
+            let v_parsed = percent_decode_if_needed!(&self.value, self.decode)
+                .map_err(|_| de::value::Error::custom(
+                    format!("can not parse {:?} to a {}", &self.value, $tp)
+                ))?;
+            visitor.$visit_fn(v_parsed)
        }
    }
 }

 struct Value<'de> {
    value: &'de str,
+    decode: bool,
 }

 impl<'de> Deserializer<'de> for Value<'de> {
@ -377,6 +388,7 @@ impl<'de> Deserializer<'de> for Value<'de> {

 struct ParamsSeq<'de> {
    params: ParamsIter<'de>,
+    decode: bool,
 }

 impl<'de> de::SeqAccess<'de> for ParamsSeq<'de> {
@ -387,7 +399,7 @@ impl<'de> de::SeqAccess<'de> for ParamsSeq<'de> {
        T: de::DeserializeSeed<'de>,
    {
        match self.params.next() {
-            Some(item) => Ok(Some(seed.deserialize(Value { value: item.1 })?)),
+            Some(item) => Ok(Some(seed.deserialize(Value { value: item.1, decode: self.decode })?)),
            None => Ok(None),
        }
    }
--- a/src/extractor.rs
+++ b/src/extractor.rs
@ -18,7 +18,8 @@ use httpmessage::{HttpMessage, MessageBody, UrlEncoded};
 use httprequest::HttpRequest;

 #[derive(PartialEq, Eq, PartialOrd, Ord)]
-/// Extract typed information from the request's path.
+/// Extract typed information from the request's path. Information from the path is
+/// URL decoded. Decoding of special characters can be disabled through `PathConfig`.
 ///
 /// ## Example
 ///
@ -119,7 +120,7 @@ where
        let req = req.clone();
        let req2 = req.clone();
        let err = Rc::clone(&cfg.ehandler);
-        de::Deserialize::deserialize(PathDeserializer::new(&req))
+        de::Deserialize::deserialize(PathDeserializer::new(&req, cfg.decode))
            .map_err(move |e| (*err)(e, &req2))
            .map(|inner| Path { inner })
    }
@ -149,6 +150,7 @@ where
 /// ```
 pub struct PathConfig<S> {
    ehandler: Rc<Fn(serde_urlencoded::de::Error, &HttpRequest<S>) -> Error>,
+    decode: bool,
 }
 impl<S> PathConfig<S> {
    /// Set custom error handler
@ -159,12 +161,20 @@ impl<S> PathConfig<S> {
        self.ehandler = Rc::new(f);
        self
    }
+
+    /// Disable decoding of URL encoded special charaters from the path
+    pub fn disable_decoding(&mut self) -> &mut Self
+    {
+        self.decode = false;
+        self
+    }
 }

 impl<S> Default for PathConfig<S> {
    fn default() -> Self {
        PathConfig {
            ehandler: Rc::new(|e, _| ErrorNotFound(e)),
+            decode: true,
        }
    }
 }
@ -1090,6 +1100,68 @@ mod tests {
        assert_eq!(*Path::<i8>::from_request(&req, &&PathConfig::default()).unwrap(), 32);
    }

+    #[test]
+    fn test_extract_path_decode() {
+        let mut router = Router::<()>::default();
+        router.register_resource(Resource::new(ResourceDef::new("/{value}/")));
+
+        macro_rules! test_single_value {
+            ($value:expr, $expected:expr) => {
+                {
+                    let req = TestRequest::with_uri($value).finish();
+                    let info = router.recognize(&req, &(), 0);
+                    let req = req.with_route_info(info);
+                    assert_eq!(*Path::<String>::from_request(&req, &PathConfig::default()).unwrap(), $expected);
+                }
+            }
+        }
+
+        test_single_value!("/%25/", "%");
+        test_single_value!("/%40%C2%A3%24%25%5E%26%2B%3D/", "@£$%^&+=");
+        test_single_value!("/%2B/", "+");
+        test_single_value!("/%252B/", "%2B");
+        test_single_value!("/%2F/", "/");
+        test_single_value!("/%252F/", "%2F");
+        test_single_value!("/http%3A%2F%2Flocalhost%3A80%2Ffoo/", "http://localhost:80/foo");
+        test_single_value!("/%2Fvar%2Flog%2Fsyslog/", "/var/log/syslog");
+        test_single_value!(
+            "/http%3A%2F%2Flocalhost%3A80%2Ffile%2F%252Fvar%252Flog%252Fsyslog/",
+            "http://localhost:80/file/%2Fvar%2Flog%2Fsyslog"
+        );
+
+        let req = TestRequest::with_uri("/%25/7/?id=test").finish();
+
+        let mut router = Router::<()>::default();
+        router.register_resource(Resource::new(ResourceDef::new("/{key}/{value}/")));
+        let info = router.recognize(&req, &(), 0);
+        let req = req.with_route_info(info);
+
+        let s = Path::<Test2>::from_request(&req, &PathConfig::default()).unwrap();
+        assert_eq!(s.key, "%");
+        assert_eq!(s.value, 7);
+
+        let s = Path::<(String, String)>::from_request(&req, &PathConfig::default()).unwrap();
+        assert_eq!(s.0, "%");
+        assert_eq!(s.1, "7");
+    }
+
+    #[test]
+    fn test_extract_path_no_decode() {
+        let mut router = Router::<()>::default();
+        router.register_resource(Resource::new(ResourceDef::new("/{value}/")));
+
+        let req = TestRequest::with_uri("/%25/").finish();
+        let info = router.recognize(&req, &(), 0);
+        let req = req.with_route_info(info);
+        assert_eq!(
+            *Path::<String>::from_request(
+                &req,
+                &&PathConfig::default().disable_decoding()
+            ).unwrap(),
+            "%25"
+        );
+    }
+
    #[test]
    fn test_tuple_extract() {
        let mut router = Router::<()>::default();
--- a/src/param.rs
+++ b/src/param.rs
@ -8,7 +8,7 @@ use http::StatusCode;
 use smallvec::SmallVec;

 use error::{InternalError, ResponseError, UriSegmentError};
-use uri::Url;
+use uri::{Url, RESERVED_QUOTER};

 /// A trait to abstract the idea of creating a new instance of a type from a
 /// path parameter.
@ -103,6 +103,17 @@ impl Params {
        }
    }

+    /// Get URL-decoded matched parameter by name without type conversion
+    pub fn get_decoded(&self, key: &str) -> Option<String> {
+        self.get(key).map(|value| {
+            if let Some(ref mut value) = RESERVED_QUOTER.requote(value.as_bytes()) {
+                Rc::make_mut(value).to_string()
+            } else {
+                value.to_string()
+            }
+        })
+    }
+
    /// Get unprocessed part of path
    pub fn unprocessed(&self) -> &str {
        &self.url.path()[(self.tail as usize)..]
@ -300,4 +311,24 @@ mod tests {
            Ok(PathBuf::from_iter(vec!["seg2"]))
        );
    }
+
+    #[test]
+    fn test_get_param_by_name() {
+        let mut params = Params::new();
+        params.add_static("item1", "path");
+        params.add_static("item2", "http%3A%2F%2Flocalhost%3A80%2Ffoo");
+
+        assert_eq!(params.get("item0"), None);
+        assert_eq!(params.get_decoded("item0"), None);
+        assert_eq!(params.get("item1"), Some("path"));
+        assert_eq!(params.get_decoded("item1"), Some("path".to_string()));
+        assert_eq!(
+            params.get("item2"),
+            Some("http%3A%2F%2Flocalhost%3A80%2Ffoo")
+        );
+        assert_eq!(
+            params.get_decoded("item2"),
+            Some("http://localhost:80/foo".to_string())
+        );
+    }
 }
--- a/src/uri.rs
+++ b/src/uri.rs
@ -1,25 +1,12 @@
 use http::Uri;
 use std::rc::Rc;

-#[allow(dead_code)]
-const GEN_DELIMS: &[u8] = b":/?#[]@";
-#[allow(dead_code)]
-const SUB_DELIMS_WITHOUT_QS: &[u8] = b"!$'()*,";
-#[allow(dead_code)]
-const SUB_DELIMS: &[u8] = b"!$'()*,+?=;";
-#[allow(dead_code)]
-const RESERVED: &[u8] = b":/?#[]@!$'()*,+?=;";
-#[allow(dead_code)]
-const UNRESERVED: &[u8] = b"abcdefghijklmnopqrstuvwxyz
-    ABCDEFGHIJKLMNOPQRSTUVWXYZ
-    1234567890
-    -._~";
-const ALLOWED: &[u8] = b"abcdefghijklmnopqrstuvwxyz
-    ABCDEFGHIJKLMNOPQRSTUVWXYZ
-    1234567890
-    -._~
-    !$'()*,";
-const QS: &[u8] = b"+&=;b";
+// https://tools.ietf.org/html/rfc3986#section-2.2
+const RESERVED_PLUS_EXTRA: &[u8] = b":/?#[]@!$&'()*,+?;=%^ <>\"\\`{}|";
+
+// https://tools.ietf.org/html/rfc3986#section-2.3
+const UNRESERVED: &[u8] =
+    b"abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ1234567890-._~";

 #[inline]
 fn bit_at(array: &[u8], ch: u8) -> bool {
@ -32,7 +19,8 @@ fn set_bit(array: &mut [u8], ch: u8) {
 }

 lazy_static! {
-    static ref DEFAULT_QUOTER: Quoter = { Quoter::new(b"@:", b"/+") };
+    static ref UNRESERVED_QUOTER: Quoter = { Quoter::new(UNRESERVED) };
+    pub(crate) static ref RESERVED_QUOTER: Quoter = { Quoter::new(RESERVED_PLUS_EXTRA) };
 }

 #[derive(Default, Clone, Debug)]
@ -43,7 +31,7 @@ pub(crate) struct Url {

 impl Url {
    pub fn new(uri: Uri) -> Url {
-        let path = DEFAULT_QUOTER.requote(uri.path().as_bytes());
+        let path = UNRESERVED_QUOTER.requote(uri.path().as_bytes());

        Url { uri, path }
    }
@ -63,36 +51,19 @@ impl Url {

 pub(crate) struct Quoter {
    safe_table: [u8; 16],
-    protected_table: [u8; 16],
 }

 impl Quoter {
-    pub fn new(safe: &[u8], protected: &[u8]) -> Quoter {
+    pub fn new(safe: &[u8]) -> Quoter {
        let mut q = Quoter {
            safe_table: [0; 16],
-            protected_table: [0; 16],
        };

        // prepare safe table
-        for i in 0..128 {
-            if ALLOWED.contains(&i) {
-                set_bit(&mut q.safe_table, i);
-            }
-            if QS.contains(&i) {
-                set_bit(&mut q.safe_table, i);
-            }
-        }
-
        for ch in safe {
            set_bit(&mut q.safe_table, *ch)
        }

-        // prepare protected table
-        for ch in protected {
-            set_bit(&mut q.safe_table, *ch);
-            set_bit(&mut q.protected_table, *ch);
-        }
-
        q
    }

@ -115,19 +86,17 @@ impl Quoter {

                    if let Some(ch) = restore_ch(pct[1], pct[2]) {
                        if ch < 128 {
-                            if bit_at(&self.protected_table, ch) {
-                                buf.extend_from_slice(&pct);
-                                idx += 1;
-                                continue;
-                            }
-
                            if bit_at(&self.safe_table, ch) {
                                buf.push(ch);
                                idx += 1;
                                continue;
                            }
+
+                            buf.extend_from_slice(&pct);
+                        } else {
+                            // Not ASCII, decode it
+                            buf.push(ch);
                        }
-                        buf.push(ch);
                    } else {
                        buf.extend_from_slice(&pct[..]);
                    }
@ -172,3 +141,37 @@ fn from_hex(v: u8) -> Option<u8> {
 fn restore_ch(d1: u8, d2: u8) -> Option<u8> {
    from_hex(d1).and_then(|d1| from_hex(d2).and_then(move |d2| Some(d1 << 4 | d2)))
 }
+
+
+#[cfg(test)]
+mod tests {
+    use std::rc::Rc;
+
+    use super::*;
+
+    #[test]
+    fn decode_path() {
+        assert_eq!(UNRESERVED_QUOTER.requote(b"https://localhost:80/foo"), None);
+
+        assert_eq!(
+            Rc::try_unwrap(UNRESERVED_QUOTER.requote(
+                b"https://localhost:80/foo%25"
+            ).unwrap()).unwrap(),
+            "https://localhost:80/foo%25".to_string()
+        );
+
+        assert_eq!(
+            Rc::try_unwrap(UNRESERVED_QUOTER.requote(
+                b"http://cache-service/http%3A%2F%2Flocalhost%3A80%2Ffoo"
+            ).unwrap()).unwrap(),
+            "http://cache-service/http%3A%2F%2Flocalhost%3A80%2Ffoo".to_string()
+        );
+
+        assert_eq!(
+            Rc::try_unwrap(UNRESERVED_QUOTER.requote(
+                b"http://cache/http%3A%2F%2Flocal%3A80%2Ffile%2F%252Fvar%252Flog%0A"
+            ).unwrap()).unwrap(),
+            "http://cache/http%3A%2F%2Flocal%3A80%2Ffile%2F%252Fvar%252Flog%0A".to_string()
+        );
+    }
+}
--- a/tests/test_handlers.rs
+++ b/tests/test_handlers.rs
@ -672,6 +672,6 @@ fn test_unsafe_path_route() {
    let bytes = srv.execute(response.body()).unwrap();
    assert_eq!(
        bytes,
-        Bytes::from_static(b"success: http:%2F%2Fexample.com")
+        Bytes::from_static(b"success: http%3A%2F%2Fexample.com")
    );
 }