chore: Implement utilities for git

Author: koki-develop

lib/util/git.ts

@@ -0,0 +1,50 @@
+import { Octokit } from "octokit";
+
+const octokit = new Octokit({
+  auth: process.env.GITHUB_TOKEN,
+});
+
+export async function getLatestRelease(owner: string, repo: string) {
+  const { data: latestRelease } = await octokit.rest.repos.getLatestRelease({
+    owner,
+    repo,
+  });
+  return latestRelease;
+}
+
+export async function getCommit(owner: string, repo: string, ref: string) {
+  const { data: commit } = await octokit.rest.repos.getCommit({
+    owner,
+    repo,
+    ref,
+  });
+  return commit;
+}
+
+export async function getFileContent(
+  owner: string,
+  repo: string,
+  ref: string,
+  path: string,
+) {
+  const { data: content } = await octokit.rest.repos.getContent({
+    owner,
+    repo,
+    ref,
+    path,
+  });
+
+  if (Array.isArray(content)) {
+    throw new Error("Expected a single file, got a directory");
+  }
+
+  if (content.type !== "file") {
+    throw new Error(`Expected a file, got a ${content.type}`);
+  }
+
+  if (content.encoding !== "base64") {
+    throw new Error(`Expected base64 encoding, got ${content.encoding}`);
+  }
+
+  return Buffer.from(content.content, "base64").toString("utf-8");
+}