From cb743f53e7f720d54e9dce944a3ad41617a79f83 Mon Sep 17 00:00:00 2001
From: Yasutake Yohei <61961825+yasutakeyohei@users.noreply.github.com>
Date: Wed, 7 Oct 2026 06:39:31 +0900
Subject: astro.config.mjs, package.json, scripts/indexnow.mjs:
 IndexNowとサイトマップlastmodを追加
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IndexNowのキーファイルと送信スクリプト、npm run indexnow、各ページの最終更新日をlastmodに反映。
---
 astro.config.mjs                            | 45 +++++++++++++++++-
 package.json                                |  1 +
 public/b6f59342dacdbcb8d12be4b280873d19.txt |  1 +
 scripts/indexnow.mjs                        | 71 +++++++++++++++++++++++++++++
 4 files changed, 117 insertions(+), 1 deletion(-)
 create mode 100644 public/b6f59342dacdbcb8d12be4b280873d19.txt
 create mode 100644 scripts/indexnow.mjs

diff --git a/astro.config.mjs b/astro.config.mjs
index 46174d3..f6dd237 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -1,3 +1,4 @@
+import { execSync } from "node:child_process";
 import { existsSync } from "node:fs";
 import { join } from "node:path";
 import { fileURLToPath } from "node:url";
@@ -45,6 +46,42 @@ function publicDirIndexPlugin() {
   };
 }
 
+// ページの最終更新日を git の履歴から引く（サイトマップの lastmod 用）。
+function buildGitDateMap() {
+  const map = new Map();
+  try {
+    const out = execSync("git log --no-merges --pretty=format:__C__%cI --name-only", {
+      encoding: "utf-8",
+      maxBuffer: 256 * 1024 * 1024,
+    });
+    let date = "";
+    for (const raw of out.split("\n")) {
+      const line = raw.trim();
+      if (line.startsWith("__C__")) {
+        date = line.slice(5);
+      } else if (line && date && !map.has(line)) {
+        map.set(line, date);
+      }
+    }
+  } catch {
+    // git が使えない環境では lastmod を付けない。
+  }
+  return map;
+}
+const gitDates = buildGitDateMap();
+
+function lastmodFor(url) {
+  const path = url.replace(/^https?:\/\/[^/]+/, "").replace(/^\/+|\/+$/g, "");
+  const bases = path ? [path, `${path}/index`] : ["index"];
+  for (const base of bases) {
+    for (const ext of [".mdx", ".md"]) {
+      const date = gitDates.get(`src/content/docs/${base}${ext}`);
+      if (date) return new Date(date);
+    }
+  }
+  return undefined;
+}
+
 export default defineConfig({
   site: "https://yasutakeyohei.com",
   base: "/",
@@ -61,7 +98,13 @@ export default defineConfig({
     plugins: [publicDirIndexPlugin()],
   },
   integrations: [
-    sitemap(),
+    sitemap({
+      serialize(item) {
+        const lastmod = lastmodFor(item.url);
+        if (lastmod) item.lastmod = lastmod;
+        return item;
+      },
+    }),
     updatesIntegration(),
     ogImagePlugin(),
     starlight({
diff --git a/package.json b/package.json
index ddbe175..046dbd5 100644
--- a/package.json
+++ b/package.json
@@ -10,6 +10,7 @@
     "prebuild": "node scripts/optimize-images.mjs --apply",
     "build": "astro build && py -c \"import shutil; shutil.copy('public/.htaccess', 'dist/.htaccess')\" && py removeNullCharacters.py && node scripts/generate-llms-full.mjs",
     "deploy": "sh deploy.sh",
+    "indexnow": "node scripts/indexnow.mjs",
     "preview": "astro preview",
     "postinstall": "patch-package",
     "astro": "astro"
diff --git a/public/b6f59342dacdbcb8d12be4b280873d19.txt b/public/b6f59342dacdbcb8d12be4b280873d19.txt
new file mode 100644
index 0000000..8ee84ae
--- /dev/null
+++ b/public/b6f59342dacdbcb8d12be4b280873d19.txt
@@ -0,0 +1 @@
+b6f59342dacdbcb8d12be4b280873d19
diff --git a/scripts/indexnow.mjs b/scripts/indexnow.mjs
new file mode 100644
index 0000000..25bc768
--- /dev/null
+++ b/scripts/indexnow.mjs
@@ -0,0 +1,71 @@
+// IndexNow: URL を検索エンジン（Bing・Yandex・Seznam・Naver 等）へ即時通知する。
+//
+// 使い方（デプロイしてキーファイルが公開された状態で実行する）:
+//   1) サイトマップの全URLを送る:   npm run indexnow
+//   2) 特定URLだけ送る:             node scripts/indexnow.mjs https://yasutakeyohei.com/foo/ ...
+//
+// 仕様: https://www.indexnow.org/documentation
+// キーは public/<key>.txt（名前＝中身）として公開する。
+import { readFileSync, readdirSync } from "node:fs";
+import { fileURLToPath } from "node:url";
+import { dirname, join } from "node:path";
+
+const root = join(dirname(fileURLToPath(import.meta.url)), "..");
+const HOST = "yasutakeyohei.com";
+const KEY_RE = /^[A-Za-z0-9-]{8,128}$/;
+
+// public/ から IndexNow キーファイル（ファイル名＝中身の .txt）を探す。
+function findKey() {
+  if (process.env.INDEXNOW_KEY) return process.env.INDEXNOW_KEY;
+  for (const name of readdirSync(join(root, "public"))) {
+    if (!name.endsWith(".txt")) continue;
+    const stem = name.slice(0, -4);
+    if (!KEY_RE.test(stem)) continue;
+    if (readFileSync(join(root, "public", name), "utf-8").trim() === stem) {
+      return stem;
+    }
+  }
+  throw new Error("IndexNow キーファイル（public/<key>.txt）が見つかりません");
+}
+
+// 送るURLを集める（引数があればそれ、無ければ dist のサイトマップ）。
+function collectUrls() {
+  const args = process.argv.slice(2).filter((a) => a.startsWith("http"));
+  if (args.length) return args;
+  const dir = join(root, "dist");
+  const urls = [];
+  for (const name of readdirSync(dir)) {
+    if (!/^sitemap.*\.xml$/.test(name) || name === "sitemap-index.xml") continue;
+    const xml = readFileSync(join(dir, name), "utf-8");
+    for (const m of xml.matchAll(/<loc>([^<]+)<\/loc>/g)) urls.push(m[1].trim());
+  }
+  return urls;
+}
+
+async function submit(endpoint, key, urls) {
+  const res = await fetch(endpoint, {
+    method: "POST",
+    headers: { "Content-Type": "application/json; charset=utf-8" },
+    body: JSON.stringify({
+      host: HOST,
+      key,
+      keyLocation: `https://${HOST}/${key}.txt`,
+      urlList: urls,
+    }),
+  });
+  return `${endpoint} -> ${res.status} ${res.statusText}`;
+}
+
+const key = findKey();
+const urls = collectUrls();
+console.log(`IndexNow: key=${key} / urls=${urls.length}`);
+for (const ep of [
+  "https://api.indexnow.org/indexnow",
+  "https://www.bing.com/indexnow",
+]) {
+  try {
+    console.log(" ", await submit(ep, key, urls));
+  } catch (e) {
+    console.error(` ${ep} FAILED:`, e.message);
+  }
+}
-- 
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