305 lines
10 KiB
TypeScript
305 lines
10 KiB
TypeScript
/**
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* SEO/GEO 构建期钩子（仅 Node 构建时运行，不进客户端 bundle）：
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* - transformPageData：每页独立 title（去编号前缀）与 description（取 :::tip 首句）
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* - transformHead：canonical / Open Graph / twitter 卡片 / JSON-LD 结构化数据
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* - sitemap.transformItems：注入 lastmod（git 最后提交时间）并过滤 404
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*
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* 由 config/index.ts 通过 createSeoHooks(zhConfig.themeConfig?.sidebar) 挂载。
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* 依赖 extract.mjs（纯 ESM，同被 scripts/generate-llms-txt.mjs 复用）。
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*/
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import fs from "node:fs";
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import path from "node:path";
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import { execSync } from "node:child_process";
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import {
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SITE_URL,
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extractDescription,
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extractFaqs,
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stripNumberPrefix,
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} from "./extract.mjs";
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/** 与 vitepress HeadConfig 同构：[tag, attrs, innerHTML?] */
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type HeadTuple = [string, Record<string, any>, string?];
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interface SideItem {
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text?: string;
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link?: string;
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items?: SideItem[];
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}
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interface PageDataLike {
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relativePath?: string;
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title?: string;
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description?: string;
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frontmatter?: Record<string, any>;
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[k: string]: any;
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}
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interface TransformCtx {
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pageData?: PageDataLike;
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title?: string;
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description?: string;
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content?: string;
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siteConfig?: { root?: string; srcDir?: string };
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}
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const ORG = {
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"@type": "Organization",
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name: "EasyGoAdmin",
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url: "https://www.easygoadmin.vip",
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logo: `${SITE_URL}/logo.png`,
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sameAs: [
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"https://gitee.com/easygoadmin/EasyGoAdmin_GoFrame_EleVue",
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"https://www.easygoadmin.vip",
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],
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};
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/** 相对路径 → 站内路由（cleanUrls 关闭，正文页带 .html） */
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function routeOf(relativePath: string): string {
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if (relativePath === "index.md") return "/";
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if (relativePath === "404.md") return "/404.html";
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return `/${relativePath.replace(/\.md$/, ".html")}`;
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}
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/** 去掉侧边栏文案前导 emoji/符号，保留 "1.1 项目介绍" 这类编号文字 */
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function cleanLabel(s?: string): string {
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return (s || "").replace(/^[^\p{L}\p{N}]+/u, "").trim();
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}
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/** 从侧边栏构建 route → 面包屑文案链（含分组小节） */
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function buildCrumbMap(sidebar: unknown): Map<string, string[]> {
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const map = new Map<string, string[]>();
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const groups: SideItem[] = Array.isArray(sidebar)
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? sidebar
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: ((sidebar as Record<string, SideItem[]>)?.["/zh/"] ?? []);
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const walk = (items: SideItem[], trail: string[]) => {
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for (const item of items) {
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if (item.link && item.link.startsWith("/")) {
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map.set(item.link, [...trail, cleanLabel(item.text)]);
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} else if (item.items?.length) {
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walk(item.items, [...trail, cleanLabel(item.text)]);
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}
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}
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};
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for (const group of groups) {
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walk(group.items ?? [], [cleanLabel(group.text)].filter(Boolean));
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}
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return map;
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}
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/** 从渲染后的 HTML 提取 H1 纯文本（JSON-LD headline 须与页面 H1 一致） */
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function h1OfHtml(html?: string): string {
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const m = (html || "").match(/<h1[^>]*>([\s\S]*?)<\/h1>/i);
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if (!m) return "";
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return m[1]
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.replace(/<[^>]+>/g, "")
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.replace(/&/g, "&")
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.replace(/</g, "<")
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.replace(/>/g, ">")
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.replace(/"/g, '"')
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.replace(/'/g, "'")
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.trim();
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}
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/** 从 Markdown 源提取 H1 纯文本（去除行内 markdown 标记） */
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function h1OfMd(md: string): string {
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const m = md.match(/^# (?!#)(.+)$/m);
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if (!m) return "";
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return m[1]
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.replace(/`([^`]+)`/g, "$1")
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.replace(/\*\*([^*]+)\*\*/g, "$1")
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.trim();
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}
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export function createSeoHooks(sidebar: unknown) {
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const crumbs = buildCrumbMap(sidebar);
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const projectDirs: string[] = [];
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let gitDates: Map<string, string> | null = null;
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const readMd = (relativePath: string, srcDir?: string): string => {
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try {
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return fs.readFileSync(
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path.resolve(srcDir || process.cwd(), relativePath),
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"utf8",
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);
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} catch {
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return "";
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}
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};
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/**
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* 项目内每个文件最后一次 git 提交的 ISO 时间。
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* 单次 git log 调用构建全量映射（key = 相对路径，与 pageData.relativePath 一致）；
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* git 不可用时静默降级（sitemap 无 lastmod、JSON-LD 无 dateModified）。
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*/
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const getGitDates = (root: string): Map<string, string> => {
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if (gitDates) return gitDates;
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gitDates = new Map<string, string>();
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try {
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const out = execSync(
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"git log --format=:::%cI --name-only --relative -n 500 -- .",
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{
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cwd: root,
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encoding: "utf8",
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maxBuffer: 64 * 1024 * 1024,
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stdio: ["ignore", "pipe", "ignore"],
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},
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);
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let current = "";
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for (const line of out.split(/\r?\n/)) {
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if (line.startsWith(":::")) {
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current = line.slice(3).trim();
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continue;
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}
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const file = line.trim();
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if (file && current && !gitDates.has(file)) {
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gitDates.set(file, current);
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}
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}
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} catch {
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// 降级：无 lastmod / dateModified
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}
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return gitDates;
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};
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/** 每页独立 title（去 "5.10 " 编号前缀，关键词前置）与 description（:::tip 首句） */
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function transformPageData(pageData: PageDataLike, ctx?: any): Record<string, unknown> {
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const srcDir: string | undefined = ctx?.siteConfig?.srcDir;
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const root: string | undefined = ctx?.siteConfig?.root;
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if (root && !projectDirs.includes(root)) projectDirs.push(root);
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const out: Record<string, unknown> = {};
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const rel = pageData.relativePath;
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if (rel && !pageData.frontmatter?.description) {
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const desc = extractDescription(readMd(rel, srcDir));
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if (desc) out.description = desc;
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}
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if (pageData.title) {
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out.title = stripNumberPrefix(pageData.title);
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}
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return out;
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}
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/** 构建期注入 canonical / OG / twitter / JSON-LD */
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function transformHead(ctx: TransformCtx): HeadTuple[] {
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const rel = ctx?.pageData?.relativePath || "";
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if (!rel || rel === "404.md") return [];
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const route = routeOf(rel);
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const url = `${SITE_URL}${route}`;
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const title = ctx.pageData?.title || ctx.title || "";
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const desc = ctx.description || "";
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const isHome = rel === "index.md";
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const image = `${SITE_URL}/logo.png`;
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const heads: HeadTuple[] = [
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["link", { rel: "canonical", href: url }],
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["meta", { property: "og:type", content: isHome ? "website" : "article" }],
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["meta", { property: "og:site_name", content: "EasyGoAdmin" }],
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["meta", { property: "og:locale", content: "zh_CN" }],
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["meta", { property: "og:title", content: title }],
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["meta", { property: "og:description", content: desc }],
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["meta", { property: "og:url", content: url }],
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["meta", { property: "og:image", content: image }],
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["meta", { property: "twitter:title", content: title }],
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["meta", { property: "twitter:description", content: desc }],
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["meta", { property: "twitter:url", content: url }],
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["meta", { property: "twitter:image", content: image }],
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];
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// ---- JSON-LD ----
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const root = ctx.siteConfig?.root || projectDirs[0] || process.cwd();
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const srcDir = ctx.siteConfig?.srcDir || root;
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const lastMod = getGitDates(root).get(rel);
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const blocks: Record<string, any>[] = [];
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if (isHome) {
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blocks.push({
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"@context": "https://schema.org",
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"@type": "WebSite",
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name: "EasyGoAdmin 开发文档",
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url: `${SITE_URL}/`,
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inLanguage: "zh-CN",
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description: desc,
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});
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blocks.push({ "@context": "https://schema.org", ...ORG });
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} else {
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const md = readMd(rel, srcDir);
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const article: Record<string, any> = {
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"@context": "https://schema.org",
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"@type": "TechArticle",
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headline: h1OfMd(md) || h1OfHtml(ctx.content) || title,
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description: desc,
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url,
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inLanguage: "zh-CN",
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mainEntityOfPage: { "@type": "WebPage", "@id": url },
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publisher: ORG,
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};
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if (lastMod) article.dateModified = lastMod;
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blocks.push(article);
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const trail = crumbs.get(route);
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if (trail?.length) {
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const items: Record<string, any>[] = [
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{ "@type": "ListItem", position: 1, name: "首页", item: `${SITE_URL}/` },
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];
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trail.forEach((name, i) => {
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const node: Record<string, any> = {
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"@type": "ListItem",
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position: i + 2,
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name,
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};
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if (i === trail.length - 1) node.item = url;
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items.push(node);
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});
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blocks.push({
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"@context": "https://schema.org",
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"@type": "BreadcrumbList",
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itemListElement: items,
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});
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}
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const faqs = extractFaqs(md);
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if (faqs.length) {
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blocks.push({
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"@context": "https://schema.org",
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"@type": "FAQPage",
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mainEntity: faqs.map((f) => ({
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"@type": "Question",
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name: f.q,
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acceptedAnswer: { "@type": "Answer", text: f.a },
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})),
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});
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}
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}
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// 转义 "<"，防止内容中出现 </script> 破坏注入
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const json = JSON.stringify(blocks).replace(/</g, "\\u003c");
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heads.push(["script", { type: "application/ld+json" }, json]);
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return heads;
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}
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/** sitemap.xml：过滤 404/README，注入 git lastmod */
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const sitemap = {
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hostname: SITE_URL,
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transformItems(items: { url: string; lastmod?: string }[]) {
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const root = projectDirs[0] || process.cwd();
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const dates = getGitDates(root);
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const out: { url: string; lastmod?: string }[] = [];
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for (const item of items) {
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// ⚠ vitepress 传入的 item.url 是相对路径（"404.html"、"zh/x.html"、""），
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// 无前导斜杠也无域名——hostname 由 SitemapStream 事后拼接。
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if (/(^|\/)404\.html$/.test(item.url)) continue; // 404 页不收录
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if (/(^|\/)README\.html$/.test(item.url)) continue; // 仓库 README 非文档页
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const p = item.url.replace(/^\//, "");
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const rel =
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p === "" || p === "index.html" ? "index.md" : p.replace(/\.html$/, ".md");
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const lastmod = dates.get(rel);
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out.push(lastmod ? { ...item, lastmod } : item);
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}
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return out;
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},
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};
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return { transformPageData, transformHead, sitemap };
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}
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