Add an optional authentication policy to [index] configuration

crates/uv-auth/Cargo.toml

@@ -24,6 +24,8 @@ reqwest = { workspace = true }
 reqwest-middleware = { workspace = true }
 rust-netrc = { workspace = true }
 rustc-hash = { workspace = true }
+schemars = { workspace = true, optional = true }
+serde = { workspace = true, features = ["derive"] }
 tokio = { workspace = true }
 tracing = { workspace = true }
 url = { workspace = true }

crates/uv-auth/src/credentials.rs

@@ -28,15 +28,7 @@ impl Username {
     /// Unlike `reqwest`, empty usernames are be encoded as `None` instead of an empty string.
     pub(crate) fn new(value: Option<String>) -> Self {
         // Ensure empty strings are `None`
-        if let Some(value) = value {
-            if value.is_empty() {
-                Self(None)
-            } else {
-                Self(Some(value))
-            }
-        } else {
-            Self(value)
-        }
+        Self(value.filter(|s| !s.is_empty()))
     }
 
     pub(crate) fn none() -> Self {

crates/uv-auth/src/lib.rs

@@ -7,12 +7,14 @@ use cache::CredentialsCache;
 pub use credentials::Credentials;
 pub use keyring::KeyringProvider;
 pub use middleware::AuthMiddleware;
+pub use policy::{AuthPolicy, UrlAuthPolicies};
 use realm::Realm;
 
 mod cache;
 mod credentials;
 mod keyring;
 mod middleware;
+mod policy;
 mod realm;
 
 // TODO(zanieb): Consider passing a cache explicitly throughout