From aa248568d0a6742a981a588e1dbabf0248d6f8b4 Mon Sep 17 00:00:00 2001
From: Praveen Perera <me@praveenperera.com>
Date: Tue, 26 Nov 2024 10:29:30 -0600
Subject: [PATCH] Create download-release.js

---
 npm/lib/download-release.js | 54 +++++++++++++++++++++++++++++++++++++
 1 file changed, 54 insertions(+)
 create mode 100644 npm/lib/download-release.js

diff --git a/npm/lib/download-release.js b/npm/lib/download-release.js
new file mode 100644
index 0000000..64b05e6
--- /dev/null
+++ b/npm/lib/download-release.js
@@ -0,0 +1,54 @@
+// @ts-check
+"use strict";
+
+const { REPO } = require("./constants");
+const get = require("./get");
+
+/**
+ * @param {string} repo
+ * @param {string} tag
+ */
+function getApiUrl(repo, tag) {
+    return `https://api.github.com/repos/${repo}/releases/tags/${tag}`;
+}
+
+/**
+ * @param {{ token?: string; version: string; }} opts
+ */
+async function getReleaseFromGitHubApi(opts) {
+    const downloadOpts = {
+        headers: {
+            "user-agent": "rustywind",
+        },
+    };
+
+    if (opts.token) {
+        downloadOpts.headers.authorization = `token ${opts.token}`;
+    }
+
+    console.log(`Finding rustywind ${opts.version} release`);
+    const release = await get(getApiUrl(REPO, opts.version), downloadOpts);
+    let jsonRelease;
+    try {
+        jsonRelease = JSON.parse(release);
+    } catch (e) {
+        throw new Error("Malformed API response: " + e.stack);
+    }
+
+    if (!jsonRelease.assets) {
+        throw new Error("Bad API response: " + JSON.stringify(release));
+    }
+
+    return jsonRelease;
+}
+
+/**
+ * @param {{ token?: string; version: string; }} opts
+ */
+module.exports = async (opts) => {
+    if (!opts.version) {
+        return Promise.reject(new Error("Missing version"));
+    }
+
+    return getReleaseFromGitHubApi(opts);
+};