Add basic registry client

crates/dinopkg-npm-registry/Cargo.toml

@@ -0,0 +1,10 @@
+[package]
+name = "dinopkg-npm-registry"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+reqwest = { version = "0.12.5", features = ["json"] }
+serde = { version = "1.0.204", features = ["derive"] }
+thiserror = "1.0.63"
+dinopkg-package-json = { path = "../dinopkg-package-json" }

crates/dinopkg-npm-registry/src/lib.rs

@@ -0,0 +1,32 @@
+use std::collections::HashMap;
+
+use serde::{Serialize, Deserialize};
+use dinopkg_package_json::PackageJson;
+
+const NPM_REGISTRY_ROOT_URL: &str = "https://registry.npmjs.org";
+
+#[derive(Serialize, Deserialize)]
+pub struct PackageInfo {
+    /// The name of the package, for example `discord.js`.
+    name: String,
+
+    /// A map of versions to their respective version info.
+    /// 
+    /// The key is the version string (e.g. `0.1.0`), and the value is the version's `package.json` info.
+    versions: HashMap<String, PackageJson>,
+}
+
+#[derive(thiserror::Error, Debug)]
+pub enum Error {
+    #[error("network error: {0}")]
+    NetworkError(#[from] reqwest::Error),
+}
+
+impl PackageInfo {
+    pub async fn get_package_info(package_name: &str, client: &reqwest::Client) -> Result<PackageInfo, Error> {
+        let url = format!("{NPM_REGISTRY_ROOT_URL}/{package_name}");
+        let response = client.get(&url).send().await?;
+        let package_info = response.json::<PackageInfo>().await?;
+        Ok(package_info)
+    }
+}