FUTURE: initial support for .npmrc file (#23560)

This commit adds initial support for ".npmrc" files.

Currently we only discover ".npmrc" files next to "package.json" files
and discovering these files in user home dir is left for a follow up.

This pass supports "_authToken" and "_auth" configuration
for providing authentication.

LSP support has been left for a follow up PR.

Towards https://github.com/denoland/deno/issues/16105

1 files changed, 24 insertions, 0 deletions

diff --git a/cli/npm/common.rs b/cli/npm/common.rs
index e40924838..bf45aa5b8 100644
--- a/cli/npm/common.rs
+++ b/cli/npm/common.rs
@@ -1,5 +1,8 @@
 // Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.
 
+use deno_npm::npm_rc::RegistryConfig;
+use reqwest::header;
+
 /// Gets the corresponding @types package for the provided package name.
 pub fn types_package_name(package_name: &str) -> String {
   debug_assert!(!package_name.starts_with("@types/"));
@@ -8,6 +11,27 @@ pub fn types_package_name(package_name: &str) -> String {
   format!("@types/{}", package_name.replace('/', "__"))
 }
 
+// TODO(bartlomieju): support more auth methods besides token and basic auth
+pub fn maybe_auth_header_for_npm_registry(
+  registry_config: &RegistryConfig,
+) -> Option<(header::HeaderName, header::HeaderValue)> {
+  if let Some(token) = registry_config.auth_token.as_ref() {
+    return Some((
+      header::AUTHORIZATION,
+      header::HeaderValue::from_str(&format!("Bearer {}", token)).unwrap(),
+    ));
+  }
+
+  if let Some(auth) = registry_config.auth.as_ref() {
+    return Some((
+      header::AUTHORIZATION,
+      header::HeaderValue::from_str(&format!("Basic {}", auth)).unwrap(),
+    ));
+  }
+
+  None
+}
+
 #[cfg(test)]
 mod test {
   use super::types_package_name;