Allow displaying [T; N], Vec<T>, [u8] via 'uri!'.

Resolves #2750.

core/codegen/tests/typed-uris.rs

@@ -673,3 +673,39 @@ fn test_route_uri_normalization_with_prefix() {
         uri!("/foo/bar/", world()) => "/foo/bar/world",
     }
 }
+
+#[test]
+fn test_vec_in_query() {
+    #[post("/?<v>")]
+    fn f(v: Vec<usize>) { }
+
+    #[post("/?<v>")]
+    fn g(v: Vec<String>) { }
+
+    #[post("/?<v>")]
+    fn h(v: &[u8]) { }
+
+    let bytes = vec![0u8, 1, 2];
+    assert_uri_eq! {
+        uri!(f(v = vec![1, 2, 3])) => "/?v=1&v=2&v=3",
+        uri!(f(v = &vec![1, 2, 3])) => "/?v=1&v=2&v=3",
+        uri!(f(v = &[1, 2, 3])) => "/?v=1&v=2&v=3",
+        uri!(f(v = [1, 2, 3])) => "/?v=1&v=2&v=3",
+
+        uri!(f(vec![1, 2, 3])) => "/?v=1&v=2&v=3",
+        uri!(f(&vec![1, 2, 3])) => "/?v=1&v=2&v=3",
+        uri!(f(&[1, 2, 3])) => "/?v=1&v=2&v=3",
+        uri!(f([1, 2, 3])) => "/?v=1&v=2&v=3",
+
+        // TODO: Introduce `RawBytes` + FromUriParam + UriDisplay impls.
+        // uri!(f(v = &[1, 2, 3][..])) => "/?v=1&v=2&v=3",
+
+        uri!(g(v = vec!["a", "b=c", "d"])) => "/?v=a&v=b%3Dc&v=d",
+        uri!(g(v = &vec!["a", "b=c", "d"])) => "/?v=a&v=b%3Dc&v=d",
+        uri!(g(v = ["a", "b=c", "d"])) => "/?v=a&v=b%3Dc&v=d",
+        uri!(g(v = &["a", "b=c", "d"])) => "/?v=a&v=b%3Dc&v=d",
+
+        uri!(h(v = bytes.as_slice())) => "/?v=%00%01%02",
+        uri!(h(v = &[1, 2, 3][..])) => "/?v=%01%02%03",
+    }
+}

core/http/src/uri/fmt/from_uri_param.rs

@@ -16,15 +16,16 @@ use crate::uri::fmt::{self, Part};
 ///
 /// In the rare case that `UriDisplay` is implemented manually, this trait, too,
 /// must be implemented explicitly. In the majority of cases, implementation can
-/// be automated. Rocket provides [`impl_from_uri_param_identity`] to generate
+/// be automated. Rocket provides [`impl_from_uri_param_identity!`] to generate
 /// the _identity_ implementations automatically. For a type `T`, these are:
 ///
 ///   * `impl<P: Part> FromUriParam<P, T> for T`
 ///   * `impl<'x, P: Part> FromUriParam<P, &'x T> for T`
 ///   * `impl<'x, P: Part> FromUriParam<P, &'x mut T> for T`
 ///
-/// See [`impl_from_uri_param_identity!`](crate::impl_from_uri_param_identity!)
+/// See [`impl_from_uri_param_identity!`] for usage details.
-/// for usage details.
+///
+/// [`impl_from_uri_param_identity!`]: crate::impl_from_uri_param_identity!
 ///
 /// # Code Generation
 ///
@@ -316,7 +317,31 @@ impl_from_uri_param_identity!([fmt::Path] PathBuf);
 
 impl_conversion_ref! {
     [fmt::Path] ('a) &'a Path => PathBuf,
-    [fmt::Path] ('a) PathBuf => &'a Path
+    [fmt::Path] ('a) PathBuf => &'a Path,
+}
+
+// TODO: A specialized `RawBytes` instead of `&[u8]`. Then impl [T] => Vec<T>.
+impl_from_uri_param_identity!([fmt::Query] ('a) &'a [u8]);
+
+impl_conversion_ref! {
+    [fmt::Query] (T, A: FromUriParam<fmt::Query, T> + UriDisplay<fmt::Query>) Vec<A> => Vec<T>,
+    [fmt::Query] (
+            T,
+            A: FromUriParam<fmt::Query, T> + UriDisplay<fmt::Query>,
+            const N: usize
+        ) Vec<A> => [T; N],
+
+    [fmt::Query] (
+            T,
+            A: FromUriParam<fmt::Query, T> + UriDisplay<fmt::Query>,
+            const N: usize
+        ) [A; N] => Vec<T>,
+
+    [fmt::Query] (
+            T,
+            A: FromUriParam<fmt::Query, T> + UriDisplay<fmt::Query>,
+            const N: usize
+        ) [A; N] => [T; N],
 }
 
 /// A no cost conversion allowing an `&str` to be used in place of a `PathBuf`.

core/http/src/uri/fmt/uri_display.rs

@@ -453,11 +453,19 @@ impl<T: UriDisplay<Query>, E> UriDisplay<Query> for Result<T, E> {
 
 impl<T: UriDisplay<Query>> UriDisplay<Query> for Vec<T> {
     fn fmt(&self, f: &mut Formatter<'_, Query>) -> fmt::Result {
-        for value in self {
+        self.iter().try_for_each(|v| f.write_value(v))
-            f.write_value(value)?;
+    }
-        }
+}
 
-        Ok(())
+impl<T: UriDisplay<Query>, const N: usize> UriDisplay<Query> for [T; N] {
+    fn fmt(&self, f: &mut Formatter<'_, Query>) -> fmt::Result {
+        self.iter().try_for_each(|v| f.write_value(v))
+    }
+}
+
+impl UriDisplay<Query> for [u8] {
+    fn fmt(&self, f: &mut Formatter<'_, Query>) -> fmt::Result {
+        f.write_raw(RawStr::percent_encode_bytes(self).as_str())
     }
 }