feat: Use a GitHub token for authorization if it exists.

src/fetcher/git.rs

@@ -20,9 +20,9 @@ impl<'a> SimpleFetcher<'a, 1> for Fetchgit {
     }
 }
 
-impl<'a> Fetchgit {
+impl Fetchgit {
     fn fetch(
-        &'a self,
+        &self,
         values @ [url]: &[&str; 1],
         rev: &str,
         submodules: bool,

src/fetcher/github.rs

@@ -14,6 +14,12 @@ struct Commit {
     sha: String,
 }
 
+fn token() -> Option<String> {
+    ["GH_TOKEN", "GITHUB_TOKEN", "GITHUB_API_TOKEN"]
+        .iter()
+        .find_map(|key| std::env::var(key).ok())
+}
+
 impl SimpleFetcher<'_, 2> for FetchFromGitHub<'_> {
     const HOST_KEY: &'static str = "githubBase";
     const KEYS: [&'static str; 2] = ["owner", "repo"];
@@ -28,7 +34,16 @@ impl SimpleFetcher<'_, 2> for FetchFromGitHub<'_> {
         let host = self.0.unwrap_or("github.com");
         let url = format!("https://api.{host}/repos/{owner}/{repo}/commits?per_page=1");
 
-        let [Commit { sha }] = ureq::get(&url)
+        // https://docs.github.com/en/rest/authentication/authenticating-to-the-rest-api
+        let mut request = ureq::get(&url)
+            .set("Accept", "application/vnd.github+json")
+            .set("X-GitHub-Api-Version", "2022-11-28");
+
+        if let Some(token) = token() {
+            request = request.set("Authorization", &format!("Bearer {token}"));
+        }
+
+        let [Commit { sha }] = request
             .call()?
             .into_json::<[_; 1]>()
             .with_context(|| format!("no commits found for https://{host}/{owner}/{repo}"))?;

src/simple.rs

@@ -41,7 +41,7 @@ pub trait SimpleFetcher<'a, const N: usize> {
     }
 
     fn resolve_submodules(&self, submodules: Option<bool>) -> bool {
-        submodules.map_or(false, |submodules| submodules ^ Self::SUBMODULES_DEFAULT)
+        submodules.is_some_and(|submodules| submodules ^ Self::SUBMODULES_DEFAULT)
     }
 
     fn fetch_rev(&self, _: &[&str; N]) -> Result<String> {