Ignore invalid extras from PyPI (#1731)

## Summary

We don't control these, so it seems preferable _not_ to fail on them,
but rather, to just ignore them entirely. (I considered adding a long
allow-list, but then questioned the point of it? We'd end up having to
extend it if more invalid extras were published in the future.)

Closes https://github.com/astral-sh/uv/issues/1633.

crates/pypi-types/src/lenient_requirement.rs

@@ -7,7 +7,6 @@ use tracing::warn;
 
 use pep440_rs::{VersionSpecifiers, VersionSpecifiersParseError};
 use pep508_rs::{Pep508Error, Requirement};
-use uv_normalize::{ExtraName, InvalidNameError};
 
 /// Ex) `>=7.2.0<8.0.0`
 static MISSING_COMMA: Lazy<Regex> = Lazy::new(|| Regex::new(r"(\d)([<>=~^!])").unwrap());
@@ -123,36 +122,6 @@ impl<'de> Deserialize<'de> for LenientVersionSpecifiers {
     }
 }
 
-#[derive(Debug, Clone)]
-pub struct LenientExtraName(ExtraName);
-
-impl LenientExtraName {
-    /// Parse an [`ExtraName`] from a string, but return `None` if the name is `.none`.
-    ///
-    /// Some versions of `flit` erroneously included `.none` as an extra name, which is not
-    /// allowed by PEP 508.
-    ///
-    /// See: <https://github.com/pypa/flit/issues/228/>
-    pub fn try_parse(name: String) -> Option<Result<Self, InvalidNameError>> {
-        match ExtraName::new(name) {
-            Ok(name) => Some(Ok(Self(name))),
-            Err(err) => {
-                if err.as_str() == ".none" {
-                    None
-                } else {
-                    Some(Err(err))
-                }
-            }
-        }
-    }
-}
-
-impl From<LenientExtraName> for ExtraName {
-    fn from(name: LenientExtraName) -> Self {
-        name.0
-    }
-}
-
 #[cfg(test)]
 mod tests {
     use std::str::FromStr;

crates/pypi-types/src/metadata.rs

@@ -6,13 +6,14 @@ use std::str::FromStr;
 use mailparse::{MailHeaderMap, MailParseError};
 use serde::{Deserialize, Serialize};
 use thiserror::Error;
+use tracing::warn;
 
 use pep440_rs::{Version, VersionParseError, VersionSpecifiers, VersionSpecifiersParseError};
 use pep508_rs::{Pep508Error, Requirement};
 use uv_normalize::{ExtraName, InvalidNameError, PackageName};
 
 use crate::lenient_requirement::LenientRequirement;
-use crate::{LenientExtraName, LenientVersionSpecifiers};
+use crate::LenientVersionSpecifiers;
 
 /// Python Package Metadata 2.1 as specified in
 /// <https://packaging.python.org/specifications/core-metadata/>.
@@ -119,12 +120,14 @@ impl Metadata21 {
             })
             .transpose()?;
         let provides_extras = get_all_values("Provides-Extra")
-            .filter_map(LenientExtraName::try_parse)
-            .map(|result| match result {
-                Ok(extra_name) => Ok(ExtraName::from(extra_name)),
-                Err(err) => Err(err),
+            .filter_map(|provides_extra| match ExtraName::new(provides_extra) {
+                Ok(extra_name) => Some(extra_name),
+                Err(err) => {
+                    warn!("Ignoring invalid extra: {err}");
+                    None
+                }
             })
-            .collect::<Result<Vec<_>, _>>()?;
+            .collect::<Vec<_>>();
 
         Ok(Metadata21 {
             metadata_version,