fix(lsp): normalize "deno:" urls statelessly (#20867)

cli/lsp/urls.rs

@@ -24,8 +24,6 @@ pub static INVALID_SPECIFIER: Lazy<ModuleSpecifier> =
 /// the component percent encoding set.
 ///
 /// See: <https://url.spec.whatwg.org/#component-percent-encode-set>
-///
-// TODO(@kitsonk) - refactor when #9934 is landed.
 const COMPONENT: &percent_encoding::AsciiSet = &percent_encoding::CONTROLS
   .add(b' ')
   .add(b'"')
@@ -47,6 +45,7 @@ const COMPONENT: &percent_encoding::AsciiSet = &percent_encoding::CONTROLS
   .add(b'^')
   .add(b'|')
   .add(b'$')
+  .add(b'%')
   .add(b'&')
   .add(b'+')
   .add(b',');
@@ -60,6 +59,43 @@ fn hash_data_specifier(specifier: &ModuleSpecifier) -> String {
   crate::util::checksum::gen(&[file_name_str.as_bytes()])
 }
 
+fn to_deno_url(specifier: &Url) -> String {
+  let mut string = String::with_capacity(specifier.as_str().len() + 6);
+  string.push_str("deno:/");
+  string.push_str(specifier.scheme());
+  for p in specifier[Position::BeforeHost..].split('/') {
+    string.push('/');
+    string.push_str(
+      &percent_encoding::utf8_percent_encode(p, COMPONENT).to_string(),
+    );
+  }
+  string
+}
+
+fn from_deno_url(url: &Url) -> Option<Url> {
+  if url.scheme() != "deno" {
+    return None;
+  }
+  let mut segments = url.path_segments()?;
+  let mut string = String::with_capacity(url.as_str().len());
+  string.push_str(segments.next()?);
+  string.push_str("://");
+  string.push_str(
+    &percent_encoding::percent_decode(segments.next()?.as_bytes())
+      .decode_utf8()
+      .ok()?,
+  );
+  for segment in segments {
+    string.push('/');
+    string.push_str(
+      &percent_encoding::percent_decode(segment.as_bytes())
+        .decode_utf8()
+        .ok()?,
+    );
+  }
+  Url::parse(&string).ok()
+}
+
 /// This exists to make it a little bit harder to accidentally use a `Url`
 /// in the wrong place where a client url should be used.
 #[derive(Debug, Clone, Hash, PartialEq, Eq, Ord, PartialOrd)]
@@ -171,16 +207,7 @@ impl LspUrlMap {
             extension
           )
         } else {
-          let mut str = String::with_capacity(specifier.as_str().len() + 6);
-          str.push_str("deno:/");
-          str.push_str(specifier.scheme());
-          for p in specifier[Position::BeforeHost..].split('/') {
-            str.push('/');
-            str.push_str(
-              &percent_encoding::utf8_percent_encode(p, COMPONENT).to_string(),
-            );
-          }
-          str
+          to_deno_url(specifier)
         };
         let url = LspClientUrl(Url::parse(&specifier_str)?);
         inner.put(specifier.clone(), url.clone());
@@ -210,23 +237,22 @@ impl LspUrlMap {
     }
     let mut inner = self.inner.lock();
     if let Some(specifier) = inner.get_specifier(url).cloned() {
-      specifier
-    } else {
-      let specifier = if url.scheme() == "file" {
-        if let Ok(path) = url.to_file_path() {
-          match kind {
-            LspUrlKind::Folder => Url::from_directory_path(path).unwrap(),
-            LspUrlKind::File => Url::from_file_path(path).unwrap(),
-          }
-        } else {
-          url.clone()
-        }
-      } else {
-        url.clone()
-      };
-      inner.put(specifier.clone(), LspClientUrl(url.clone()));
-      specifier
+      return specifier;
     }
+    let mut specifier = None;
+    if url.scheme() == "file" {
+      if let Ok(path) = url.to_file_path() {
+        specifier = Some(match kind {
+          LspUrlKind::Folder => Url::from_directory_path(path).unwrap(),
+          LspUrlKind::File => Url::from_file_path(path).unwrap(),
+        });
+      }
+    } else if let Some(s) = from_deno_url(url) {
+      specifier = Some(s);
+    }
+    let specifier = specifier.unwrap_or_else(|| url.clone());
+    inner.put(specifier.clone(), LspClientUrl(url.clone()));
+    specifier
   }
 }
 
@@ -261,6 +287,24 @@ mod tests {
     assert_eq!(actual_specifier, fixture);
   }
 
+  #[test]
+  fn test_lsp_url_reverse() {
+    let map = LspUrlMap::default();
+    let fixture =
+      resolve_url("deno:/https/deno.land/x/pkg%401.0.0/mod.ts").unwrap();
+    let actual_specifier = map.normalize_url(&fixture, LspUrlKind::File);
+    let expected_specifier =
+      Url::parse("https://deno.land/x/pkg@1.0.0/mod.ts").unwrap();
+    assert_eq!(&actual_specifier, &expected_specifier);
+
+    let actual_url = map
+      .normalize_specifier(&actual_specifier)
+      .unwrap()
+      .as_url()
+      .clone();
+    assert_eq!(actual_url, fixture);
+  }
+
   #[test]
   fn test_lsp_url_map_complex_encoding() {
     // Test fix for #9741 - not properly encoding certain URLs