Merge pull request #260 from eSolia/feat/nightly-rebuild-cron

feat: add Worker cron trigger for nightly rebuild

Author: RickCogley

worker/index.ts

@@ -0,0 +1,119 @@
+// Cloudflare Worker entry point.
+//
+// Two responsibilities:
+//   1. fetch()     — delegate every request to the Static Assets binding so
+//                    the site is served from _site/ exactly as before.
+//   2. scheduled() — once per day, push an empty commit to main via the
+//                    GitHub API. CF Workers Builds (already connected to
+//                    eSolia/blog.esolia.pro) sees the push and rebuilds.
+//                    This refreshes time-dependent build artefacts such as
+//                    `elapseddays` per post (computed in _config.ts).
+//
+// Manual one-time setup outside this file:
+//   - Create a fine-grained GitHub PAT scoped to eSolia/blog.esolia.pro only,
+//     permission: Contents = read & write.
+//   - Bind it to the Worker:
+//       deno run -A npm:wrangler@latest secret put GITHUB_TOKEN
+//
+// Minimal Cloudflare Workers types declared inline to avoid pulling in
+// @cloudflare/workers-types and dueling tsconfigs with the Lume Deno setup.
+
+interface Fetcher {
+  fetch(request: Request): Promise<Response>;
+}
+
+interface ExecutionContext {
+  waitUntil(promise: Promise<unknown>): void;
+  passThroughOnException(): void;
+}
+
+interface ScheduledEvent {
+  cron: string;
+  scheduledTime: number;
+  type: "scheduled";
+}
+
+interface Env {
+  ASSETS: Fetcher;
+  GITHUB_TOKEN: string;
+}
+
+const REPO_OWNER = "eSolia";
+const REPO_NAME = "blog.esolia.pro";
+const REPO_BRANCH = "main";
+const USER_AGENT = "blog-esolia-pro-rebuild-cron";
+
+export default {
+  fetch(request: Request, env: Env): Promise<Response> {
+    return env.ASSETS.fetch(request);
+  },
+
+  scheduled(_event: ScheduledEvent, env: Env, ctx: ExecutionContext): void {
+    ctx.waitUntil(triggerRebuild(env));
+  },
+};
+
+async function triggerRebuild(env: Env): Promise<void> {
+  const ghHeaders = {
+    "Authorization": `Bearer ${env.GITHUB_TOKEN}`,
+    "User-Agent": USER_AGENT,
+    "Accept": "application/vnd.github+json",
+    "X-GitHub-Api-Version": "2022-11-28",
+  };
+  const apiBase = `https://api.github.com/repos/${REPO_OWNER}/${REPO_NAME}`;
+
+  const refResp = await fetch(`${apiBase}/git/ref/heads/${REPO_BRANCH}`, {
+    headers: ghHeaders,
+  });
+  if (!refResp.ok) {
+    throw new Error(
+      `get ref failed: ${refResp.status} ${await refResp.text()}`,
+    );
+  }
+  const ref = (await refResp.json()) as { object: { sha: string } };
+  const parentSha = ref.object.sha;
+
+  const commitResp = await fetch(`${apiBase}/git/commits/${parentSha}`, {
+    headers: ghHeaders,
+  });
+  if (!commitResp.ok) {
+    throw new Error(
+      `get commit failed: ${commitResp.status} ${await commitResp.text()}`,
+    );
+  }
+  const parent = (await commitResp.json()) as { tree: { sha: string } };
+
+  const createResp = await fetch(`${apiBase}/git/commits`, {
+    method: "POST",
+    headers: { ...ghHeaders, "Content-Type": "application/json" },
+    body: JSON.stringify({
+      message:
+        "chore: nightly rebuild trigger\n\nInfoSec: no security impact — empty commit fired by Worker cron to refresh time-dependent build artefacts.",
+      tree: parent.tree.sha,
+      parents: [parentSha],
+      author: {
+        name: "blog-esolia-pro-cron",
+        email: "noreply@esolia.pro",
+        date: new Date().toISOString(),
+      },
+    }),
+  });
+  if (!createResp.ok) {
+    throw new Error(
+      `create commit failed: ${createResp.status} ${await createResp.text()}`,
+    );
+  }
+  const newCommit = (await createResp.json()) as { sha: string };
+
+  const updateResp = await fetch(`${apiBase}/git/refs/heads/${REPO_BRANCH}`, {
+    method: "PATCH",
+    headers: { ...ghHeaders, "Content-Type": "application/json" },
+    body: JSON.stringify({ sha: newCommit.sha, force: false }),
+  });
+  if (!updateResp.ok) {
+    throw new Error(
+      `update ref failed: ${updateResp.status} ${await updateResp.text()}`,
+    );
+  }
+  console.log(`Triggered rebuild via empty commit ${newCommit.sha}`);
+}

wrangler.jsonc

@@ -2,11 +2,16 @@
   "$schema": "node_modules/wrangler/config-schema.json",
   "account_id": "ab2ac8ca4000c79ae4a66377276585be",
   "name": "blog-esolia-pro",
+  "main": "./worker/index.ts",
   "compatibility_date": "2026-05-01",
   "assets": {
     "directory": "./_site",
+    "binding": "ASSETS",
     "not_found_handling": "404-page"
   },
+  "triggers": {
+    "crons": ["0 17 * * *"]
+  },
   "observability": {
     "enabled": true,
     "logs": {