Add path matchers that are more capable than gotham's stock ones

gotham_restful/Cargo.toml

@@ -25,18 +25,19 @@ gotham_derive = { git = "https://github.com/gotham-rs/gotham", version = "0.5.0-
 gotham_middleware_diesel = { git = "https://github.com/gotham-rs/gotham", version = "0.1.0", optional = true }
 gotham_restful_derive = { version = "0.0.4-dev" }
 indexmap = { version = "1.3.2", optional = true }
+itertools = "0.9.0"
 jsonwebtoken = { version = "7.1.0", optional = true }
 log = { version = "0.4.8", optional = true }
 mime = "0.3.16"
 openapiv3 = { version = "0.3", optional = true }
 serde = { version = "1.0.106", features = ["derive"] }
 serde_json = "1.0.51"
+thiserror = "1.0.15"
 uuid = { version = ">= 0.1, < 0.9", optional = true }
 
 [dev-dependencies]
 futures-executor = "0.3.4"
 paste = "0.1.10"
-thiserror = "1"
 
 [features]
 default = []

gotham_restful/src/lib.rs

@@ -151,6 +151,8 @@ pub use auth::{
 	StaticAuthHandler
 };
 
+pub mod matcher;
+
 #[cfg(feature = "openapi")]
 mod openapi;
 #[cfg(feature = "openapi")]

gotham_restful/src/matcher/accept.rs

@@ -0,0 +1,214 @@
+use super::{LookupTable, LookupTableFromTypes};
+use gotham::{
+	hyper::{
+		header::{HeaderMap, ACCEPT},
+		StatusCode
+	},
+	router::{non_match::RouteNonMatch, route::matcher::RouteMatcher},
+	state::{FromState, State}
+};
+use mime::Mime;
+use std::{
+	num::ParseFloatError,
+	str::FromStr
+};
+use thiserror::Error;
+
+
+/// A mime type that is optionally weighted with a quality.
+#[derive(Debug)]
+struct QMime
+{
+	mime : Mime,
+	weight : Option<f32>
+}
+
+impl QMime
+{
+	fn new(mime : Mime, weight : Option<f32>) -> Self
+	{
+		Self { mime, weight }
+	}
+}
+
+#[derive(Debug, Error)]
+enum QMimeError
+{
+	#[error("Unable to parse mime type: {0}")]
+	MimeError(#[from] mime::FromStrError),
+	#[error("Unable to parse mime quality: {0}")]
+	NumError(#[from] ParseFloatError)
+}
+
+impl FromStr for QMime
+{
+	type Err = QMimeError;
+	
+	fn from_str(str : &str) -> Result<Self, Self::Err>
+	{
+		match str.find(";q=") {
+			None => Ok(Self::new(str.parse()?, None)),
+			Some(index) => {
+				let mime = str[..index].parse()?;
+				let weight = str[index+3..].parse()?;
+				Ok(Self::new(mime, Some(weight)))
+			}
+		}
+	}
+}
+
+
+/**
+A route matcher that checks for the presence of a supported content type.
+
+Usage:
+
+```
+# use gotham::{helpers::http::response::create_response, hyper::StatusCode, router::builder::*};
+# use gotham_restful::matcher::ContentTypeMatcher;
+#
+let types = vec![mime::TEXT_HTML, mime::TEXT_PLAIN];
+let matcher = ContentTypeMatcher::new(types)
+	// optionally accept requests with no content type
+	.allow_no_type();
+
+# build_simple_router(|route| {
+// use the matcher for your request
+route.post("/foo")
+     .extend_route_matcher(matcher)
+	 .to(|state| {
+	 	let res = create_response(&state, StatusCode::OK, mime::TEXT_PLAIN, "Correct Content Type!");
+		(state, res)
+	});
+# });
+```
+*/
+#[derive(Clone)]
+pub struct AcceptHeaderMatcher
+{
+	types : Vec<Mime>,
+	lookup_table : LookupTable
+}
+
+impl AcceptHeaderMatcher
+{
+	/// Create a new `AcceptHeaderMatcher` with the given types that can be produced by the route.
+	pub fn new(types : Vec<Mime>) -> Self
+	{
+		let lookup_table = LookupTable::from_types(types.iter(), true);
+		Self { types, lookup_table }
+	}
+}
+
+#[inline]
+fn err() -> RouteNonMatch
+{
+	RouteNonMatch::new(StatusCode::NOT_ACCEPTABLE)
+}
+
+impl RouteMatcher for AcceptHeaderMatcher
+{
+	fn is_match(&self, state : &State) -> Result<(), RouteNonMatch>
+	{
+		HeaderMap::borrow_from(state).get(ACCEPT)
+			.map(|header| {
+				// parse mime types from the accept header
+				let acceptable = header.to_str()
+					.map_err(|_| err())?
+					.split(',')
+					.map(|str| str.trim().parse())
+					.collect::<Result<Vec<QMime>, _>>()
+					.map_err(|_| err())?;
+				
+				for qmime in acceptable
+				{
+					// get mime type candidates from the lookup table
+					let essence = qmime.mime.essence_str();
+					let candidates = match self.lookup_table.get(essence) {
+						Some(candidates) => candidates,
+						None => continue
+					};
+					for i in candidates
+					{
+						let candidate = &self.types[*i];
+						
+						// check that the candidates have the same suffix - this is not included in the
+						// essence string
+						if candidate.suffix() != qmime.mime.suffix()
+						{
+							continue
+						}
+						
+						// this candidate matches - params don't play a role in accept header matching
+						return Ok(())
+					}
+				}
+				
+				// no candidates found
+				Err(err())
+			}).unwrap_or_else(|| {
+				// no accept header - assume all types are acceptable
+				Ok(())
+			})
+	}
+}
+
+
+#[cfg(test)]
+mod test
+{
+	use super::*;
+	
+	fn with_state<F>(accept : Option<&str>, block : F)
+	where F : FnOnce(&mut State) -> ()
+	{
+		State::with_new(|state| {
+			let mut headers = HeaderMap::new();
+			if let Some(acc) = accept
+			{
+				headers.insert(ACCEPT, acc.parse().unwrap());
+			}
+			state.put(headers);
+			block(state);
+		});
+	}
+	
+	#[test]
+	fn no_accept_header()
+	{
+		let matcher = AcceptHeaderMatcher::new(vec!(mime::TEXT_PLAIN));
+		with_state(None, |state| assert!(matcher.is_match(&state).is_ok()));
+	}
+	
+	#[test]
+	fn single_mime_type()
+	{
+		let matcher = AcceptHeaderMatcher::new(vec!(mime::TEXT_PLAIN, mime::IMAGE_PNG));
+		with_state(Some("text/plain"), |state| assert!(matcher.is_match(&state).is_ok()));
+		with_state(Some("text/html"), |state| assert!(matcher.is_match(&state).is_err()));
+		with_state(Some("image/png"), |state| assert!(matcher.is_match(&state).is_ok()));
+		with_state(Some("image/webp"), |state| assert!(matcher.is_match(&state).is_err()));
+	}
+	
+	#[test]
+	fn star_star()
+	{
+		let matcher = AcceptHeaderMatcher::new(vec!(mime::IMAGE_PNG));
+		with_state(Some("*/*"), |state| assert!(matcher.is_match(&state).is_ok()));
+	}
+	
+	#[test]
+	fn image_star()
+	{
+		let matcher = AcceptHeaderMatcher::new(vec!(mime::IMAGE_PNG));
+		with_state(Some("image/*"), |state| assert!(matcher.is_match(&state).is_ok()));
+	}
+	
+	#[test]
+	fn complex_header()
+	{
+		let matcher = AcceptHeaderMatcher::new(vec!(mime::IMAGE_PNG));
+		with_state(Some("text/html,image/webp;q=0.8"), |state| assert!(matcher.is_match(&state).is_err()));
+		with_state(Some("text/html,image/webp;q=0.8,*/*;q=0.1"), |state| assert!(matcher.is_match(&state).is_ok()));
+	}
+}

gotham_restful/src/matcher/content_type.rs

@@ -0,0 +1,173 @@
+use super::{LookupTable, LookupTableFromTypes};
+use gotham::{
+	hyper::{
+		header::{HeaderMap, CONTENT_TYPE},
+		StatusCode
+	},
+	router::{non_match::RouteNonMatch, route::matcher::RouteMatcher},
+	state::{FromState, State}
+};
+use mime::Mime;
+
+/**
+A route matcher that checks for the presence of a supported content type.
+
+Usage:
+
+```
+# use gotham::{helpers::http::response::create_response, hyper::StatusCode, router::builder::*};
+# use gotham_restful::matcher::ContentTypeMatcher;
+#
+let types = vec![mime::TEXT_HTML, mime::TEXT_PLAIN];
+let matcher = ContentTypeMatcher::new(types)
+	// optionally accept requests with no content type
+	.allow_no_type();
+
+# build_simple_router(|route| {
+// use the matcher for your request
+route.post("/foo")
+     .extend_route_matcher(matcher)
+	 .to(|state| {
+	 	let res = create_response(&state, StatusCode::OK, mime::TEXT_PLAIN, "Correct Content Type!");
+		(state, res)
+	});
+# });
+```
+*/
+#[derive(Clone)]
+pub struct ContentTypeMatcher
+{
+	types : Vec<Mime>,
+	lookup_table : LookupTable,
+	allow_no_type : bool
+}
+
+impl ContentTypeMatcher
+{
+	/// Create a new `ContentTypeMatcher` with the given supported types that does not allow requests
+	/// that don't include a content-type header.
+	pub fn new(types : Vec<Mime>) -> Self
+	{
+		let lookup_table = LookupTable::from_types(types.iter(), false);
+		Self { types, lookup_table, allow_no_type: false }
+	}
+	
+	/// Modify this matcher to allow requests that don't include a content-type header.
+	pub fn allow_no_type(mut self) -> Self
+	{
+		self.allow_no_type = true;
+		self
+	}
+}
+
+#[inline]
+fn err() -> RouteNonMatch
+{
+	RouteNonMatch::new(StatusCode::UNSUPPORTED_MEDIA_TYPE)
+}
+
+impl RouteMatcher for ContentTypeMatcher
+{
+	fn is_match(&self, state : &State) -> Result<(), RouteNonMatch>
+	{
+		HeaderMap::borrow_from(state).get(CONTENT_TYPE)
+			.map(|ty| {
+				// parse mime type from the content type header
+				let mime : Mime = ty.to_str()
+					.map_err(|_| err())?
+					.parse()
+					.map_err(|_| err())?;
+				
+				// get mime type candidates from the lookup table
+				let essence = mime.essence_str();
+				let candidates = self.lookup_table.get(essence).ok_or_else(err)?;
+				for i in candidates
+				{
+					let candidate = &self.types[*i];
+					
+					// check that the candidates have the same suffix - this is not included in the
+					// essence string
+					if candidate.suffix() != mime.suffix()
+					{
+						continue
+					}
+					
+					// check that this candidate has at least the parameters that the content type
+					// has and that their values are equal
+					if candidate.params().any(|(key, value)| mime.get_param(key) != Some(value))
+					{
+						continue
+					}
+					
+					// this candidate matches
+					return Ok(())
+				}
+				
+				// no candidates found
+				Err(err())
+			}).unwrap_or_else(|| {
+				// no type present
+				if self.allow_no_type { Ok(()) } else { Err(err()) }
+			})
+	}
+}
+
+
+#[cfg(test)]
+mod test
+{
+	use super::*;
+	
+	fn with_state<F>(content_type : Option<&str>, block : F)
+	where F : FnOnce(&mut State) -> ()
+	{
+		State::with_new(|state| {
+			let mut headers = HeaderMap::new();
+			if let Some(ty) = content_type
+			{
+				headers.insert(CONTENT_TYPE, ty.parse().unwrap());
+			}
+			state.put(headers);
+			block(state);
+		});
+	}
+	
+	#[test]
+	fn empty_type_list()
+	{
+		let matcher = ContentTypeMatcher::new(Vec::new());
+		with_state(None, |state| assert!(matcher.is_match(&state).is_err()));
+		with_state(Some("text/plain"), |state| assert!(matcher.is_match(&state).is_err()));
+		
+		let matcher = matcher.allow_no_type();
+		with_state(None, |state| assert!(matcher.is_match(&state).is_ok()));
+	}
+	
+	#[test]
+	fn simple_type()
+	{
+		let matcher = ContentTypeMatcher::new(vec![mime::TEXT_PLAIN]);
+		with_state(None, |state| assert!(matcher.is_match(&state).is_err()));
+		with_state(Some("text/plain"), |state| assert!(matcher.is_match(&state).is_ok()));
+		with_state(Some("text/plain; charset=utf-8"), |state| assert!(matcher.is_match(&state).is_ok()));
+	}
+	
+	#[test]
+	fn complex_type()
+	{
+		let matcher = ContentTypeMatcher::new(vec!["image/svg+xml; charset=utf-8".parse().unwrap()]);
+		with_state(Some("image/svg"), |state| assert!(matcher.is_match(&state).is_err()));
+		with_state(Some("image/svg+xml"), |state| assert!(matcher.is_match(&state).is_err()));
+		with_state(Some("image/svg+xml; charset=utf-8"), |state| assert!(matcher.is_match(&state).is_ok()));
+		with_state(Some("image/svg+xml; charset=utf-8; eol=lf"), |state| assert!(matcher.is_match(&state).is_ok()));
+		with_state(Some("image/svg+xml; charset=us-ascii"), |state| assert!(matcher.is_match(&state).is_err()));
+		with_state(Some("image/svg+json; charset=utf-8"), |state| assert!(matcher.is_match(&state).is_err()));
+	}
+	
+	#[test]
+	fn type_mismatch()
+	{
+		let matcher = ContentTypeMatcher::new(vec![mime::TEXT_HTML]);
+		with_state(Some("text/plain"), |state| assert!(matcher.is_match(&state).is_err()));
+	}
+}

gotham_restful/src/matcher/mod.rs

@@ -0,0 +1,37 @@
+use itertools::Itertools;
+use mime::Mime;
+use std::collections::HashMap;
+
+mod accept;
+pub use accept::AcceptHeaderMatcher;
+
+mod content_type;
+pub use content_type::ContentTypeMatcher;
+
+type LookupTable = HashMap<String, Vec<usize>>;
+
+trait LookupTableFromTypes
+{
+	fn from_types<'a, I : Iterator<Item = &'a Mime>>(types : I, include_stars : bool) -> Self;
+}
+
+impl LookupTableFromTypes for LookupTable
+{
+	fn from_types<'a, I : Iterator<Item = &'a Mime>>(types : I, include_stars : bool) -> Self
+	{
+		if include_stars
+		{
+			types
+				.enumerate()
+				.flat_map(|(i, mime)| vec![("*/*".to_owned(), i), (format!("{}/*", mime.type_()), i), (mime.essence_str().to_owned(), i)].into_iter())
+				.into_group_map()
+		}
+		else
+		{
+			types
+				.enumerate()
+				.map(|(i, mime)| (mime.essence_str().to_owned(), i))
+				.into_group_map()
+		}
+	}
+}

gotham_restful/src/result.rs

@@ -6,7 +6,7 @@ use futures_util::{future, future::FutureExt};
 use gotham::hyper::Body;
 #[cfg(feature = "errorlog")]
 use log::error;
-use mime::{Mime, APPLICATION_JSON, STAR_STAR};
+use mime::{Mime, APPLICATION_JSON};
 #[cfg(feature = "openapi")]
 use openapiv3::{SchemaKind, StringFormat, StringType, Type, VariantOrUnknownOrEmpty};
 use serde::Serialize;
@@ -581,11 +581,6 @@ where
 		future::ok(Response::new(StatusCode::OK, self.raw, Some(self.mime.clone()))).boxed()
 	}
 	
-	fn accepted_types() -> Option<Vec<Mime>>
-	{
-		Some(vec![STAR_STAR])
-	}
-	
 	#[cfg(feature = "openapi")]
 	fn schema() -> OpenapiSchema
 	{

gotham_restful/src/routing.rs

@@ -1,4 +1,5 @@
 use crate::{
+	matcher::{AcceptHeaderMatcher, ContentTypeMatcher},
 	resource::*,
 	result::{ResourceError, ResourceResult, Response},
 	RequestBody,
@@ -15,11 +16,7 @@ use gotham::{
 	router::{
 		builder::*,
 		non_match::RouteNonMatch,
-		route::matcher::{
-			content_type::ContentTypeHeaderRouteMatcher,
-			AcceptHeaderRouteMatcher,
-			RouteMatcher
-		}
+		route::matcher::RouteMatcher
 	},
 	state::{FromState, State}
 };
@@ -253,7 +250,7 @@ fn delete_handler<Handler : ResourceDelete>(state : State) -> Pin<Box<HandlerFut
 #[derive(Clone)]
 struct MaybeMatchAcceptHeader
 {
-	matcher : Option<AcceptHeaderRouteMatcher>
+	matcher : Option<AcceptHeaderMatcher>
 }
 
 impl RouteMatcher for MaybeMatchAcceptHeader
@@ -276,7 +273,7 @@ impl From<Option<Vec<Mime>>> for MaybeMatchAcceptHeader
 			types => types
 		};
 		Self {
-			matcher: types.map(AcceptHeaderRouteMatcher::new)
+			matcher: types.map(AcceptHeaderMatcher::new)
 		}
 	}
 }
@@ -284,7 +281,7 @@ impl From<Option<Vec<Mime>>> for MaybeMatchAcceptHeader
 #[derive(Clone)]
 struct MaybeMatchContentTypeHeader
 {
-	matcher : Option<ContentTypeHeaderRouteMatcher>
+	matcher : Option<ContentTypeMatcher>
 }
 
 impl RouteMatcher for MaybeMatchContentTypeHeader
@@ -303,7 +300,7 @@ impl From<Option<Vec<Mime>>> for MaybeMatchContentTypeHeader
 	fn from(types : Option<Vec<Mime>>) -> Self
 	{
 		Self {
-			matcher: types.map(ContentTypeHeaderRouteMatcher::new)
+			matcher: types.map(ContentTypeMatcher::new).map(ContentTypeMatcher::allow_no_type)
 		}
 	}
 }