526 lines
14 KiB
Go
526 lines
14 KiB
Go
package handler
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import (
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"encoding/json"
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"net/http"
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"regexp"
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"strconv"
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"strings"
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"time"
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"github.com/gin-gonic/gin"
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"git.iioio.com/freefire/jiang13-forum/embed_static"
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"git.iioio.com/freefire/jiang13-forum/model"
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"git.iioio.com/freefire/jiang13-forum/service"
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)
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var (
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seoPostEditRe = regexp.MustCompile(`^/post/(\d+)/edit/?$`)
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seoBoardPathRe = regexp.MustCompile(`^/board/(\d+)/?$`)
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)
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const (
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seoDescMax = 160
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seoPrerenderMax = 4000
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seoSitemapLimit = 5000
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)
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// RobotsTxt 搜索引擎抓取规则
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func (h *Handlers) RobotsTxt(c *gin.Context) {
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base := h.publicBaseURL(c)
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var b strings.Builder
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b.WriteString("User-agent: *\n")
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b.WriteString("Allow: /\n")
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b.WriteString("Disallow: /api/\n")
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b.WriteString("Disallow: /admin\n")
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b.WriteString("Disallow: /compose\n")
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b.WriteString("Disallow: /login\n")
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b.WriteString("Disallow: /register\n")
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b.WriteString("Disallow: /profile\n")
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b.WriteString("Disallow: /favorites\n")
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b.WriteString("Disallow: /oauth/\n")
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b.WriteString("Disallow: /media/\n")
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b.WriteString("Disallow: /*/edit\n")
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if base != "" {
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b.WriteString("\nSitemap: ")
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b.WriteString(base)
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b.WriteString("/sitemap.xml\n")
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}
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c.Data(http.StatusOK, "text/plain; charset=utf-8", []byte(b.String()))
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}
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// SitemapXML 公开页面站点地图
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func (h *Handlers) SitemapXML(c *gin.Context) {
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base := h.publicBaseURL(c)
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if base == "" {
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c.String(http.StatusServiceUnavailable, "未配置站点 ROOT_URL，无法生成 sitemap")
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return
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}
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now := time.Now().UTC()
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urls := []service.SitemapURL{
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{Loc: base + "/", LastMod: now, ChangeFreq: "hourly", Priority: "1.0"},
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{Loc: base + "/projects", LastMod: now, ChangeFreq: "daily", Priority: "0.6"},
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}
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if boards, err := h.Board.List(); err == nil {
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for _, board := range boards {
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urls = append(urls, service.SitemapURL{
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Loc: base + service.QueryBoardHome(board.ID),
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LastMod: board.UpdatedAt.UTC(),
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ChangeFreq: "daily",
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Priority: "0.7",
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})
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}
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}
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permalink := h.Settings.Permalink()
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if posts, err := h.Post.ListSitemap(seoSitemapLimit); err == nil {
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for _, p := range posts {
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lm := p.UpdatedAt
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if lm.IsZero() {
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lm = p.CreatedAt
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}
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urls = append(urls, service.SitemapURL{
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Loc: base + permalink.PostPath(p.ID),
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LastMod: lm.UTC(),
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ChangeFreq: "weekly",
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Priority: "0.8",
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})
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}
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}
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if users, err := h.User.ListSitemap(seoSitemapLimit); err == nil {
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for _, u := range users {
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urls = append(urls, service.SitemapURL{
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Loc: base + permalink.UserPath(u.ID),
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LastMod: u.UpdatedAt.UTC(),
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ChangeFreq: "weekly",
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Priority: "0.5",
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})
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}
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}
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var b strings.Builder
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b.WriteString(`<?xml version="1.0" encoding="UTF-8"?>`)
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b.WriteString(`<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">`)
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for _, u := range urls {
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b.WriteString("<url>")
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b.WriteString("<loc>")
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b.WriteString(xmlEscape(u.Loc))
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b.WriteString("</loc>")
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if !u.LastMod.IsZero() {
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b.WriteString("<lastmod>")
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b.WriteString(u.LastMod.Format("2006-01-02"))
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b.WriteString("</lastmod>")
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}
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if u.ChangeFreq != "" {
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b.WriteString("<changefreq>")
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b.WriteString(u.ChangeFreq)
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b.WriteString("</changefreq>")
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}
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if u.Priority != "" {
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b.WriteString("<priority>")
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b.WriteString(u.Priority)
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b.WriteString("</priority>")
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}
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b.WriteString("</url>")
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}
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b.WriteString("</urlset>")
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c.Data(http.StatusOK, "application/xml; charset=utf-8", []byte(b.String()))
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}
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// ServePublicSPA 公开页入口：
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// - 普通用户：干净 SPA + <head> meta（无正文预渲染，避免刷新闪屏）
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// - 搜索/社交爬虫：服务端 HTML（动态渲染）
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// - 伪静态：按后台配置的后缀做规范 URL，非规范路径 301
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func (h *Handlers) ServePublicSPA(c *gin.Context) {
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path := c.Request.URL.Path
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if m := seoBoardPathRe.FindStringSubmatch(path); len(m) == 2 {
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c.Redirect(http.StatusMovedPermanently, "/?board="+m[1])
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return
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}
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brand := h.Settings.SiteBranding()
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base := h.publicBaseURL(c)
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siteName := strings.TrimSpace(brand.Name)
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if siteName == "" {
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siteName = "姜十三论坛"
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}
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defaultImage := service.AbsoluteURL(base, brand.DefaultShareImage())
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siteKeywords := brand.MetaKeywords()
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permalink := h.Settings.Permalink()
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isBot := service.IsSEOCrawler(c.Request.UserAgent())
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if isBot {
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c.Header("Vary", "User-Agent")
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}
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// 帖子详情（含可选伪静态后缀）
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if pm := permalink.MatchPostPath(path); pm.OK {
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if pm.NeedsCanonicalRedirect(path) {
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c.Redirect(http.StatusMovedPermanently, pm.Canonical)
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return
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}
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post, err := h.Post.FindByID(pm.ID)
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if err != nil || !service.CanViewPost(post, h.currentUserID(c), h.isAdmin(c)) {
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h.serveNotFound(c, base, siteName, siteKeywords, path, isBot)
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return
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}
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postKeywords := service.JoinSEOKeywords(post.Board.Name, siteKeywords)
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if isBot {
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c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(h.botPostHTML(base, siteName, defaultImage, postKeywords, post)))
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return
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}
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embed_static.ServeSPAWithMeta(c, attachSiteSEO(h.postPageMeta(base, siteName, defaultImage, post), siteName, postKeywords))
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return
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}
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// 用户主页
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if um := permalink.MatchUserPath(path); um.OK {
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if um.NeedsCanonicalRedirect(path) {
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c.Redirect(http.StatusMovedPermanently, um.Canonical)
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return
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}
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user, err := h.User.GetByID(um.ID)
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if err != nil || user.Banned {
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h.serveNotFound(c, base, siteName, siteKeywords, path, isBot)
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return
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}
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if isBot {
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c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(h.botUserHTML(base, siteName, defaultImage, siteKeywords, user)))
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return
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}
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embed_static.ServeSPAWithMeta(c, attachSiteSEO(h.userPageMeta(base, siteName, defaultImage, user), siteName, siteKeywords))
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return
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}
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// 未知路径 → 404
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if !isKnownPublicPath(path) {
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h.serveNotFound(c, base, siteName, siteKeywords, path, isBot)
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return
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}
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// 其余已知路由：SPA + head meta；首页对爬虫额外返回可读正文
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meta := h.buildSPAPageMeta(c, path, brand, base, siteName, defaultImage)
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if isBot && (path == "/" || path == "") {
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c.Data(http.StatusOK, "text/html; charset=utf-8", []byte(h.botHomeHTML(meta, brand)))
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return
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}
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embed_static.ServeSPAWithMeta(c, meta)
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}
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func (h *Handlers) serveNotFound(c *gin.Context, base, siteName, keywords, path string, isBot bool) {
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if isBot {
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c.Header("Vary", "User-Agent")
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c.Data(http.StatusNotFound, "text/html; charset=utf-8", []byte(botNotFoundHTML(base, siteName, keywords, path)))
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return
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}
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embed_static.ServeSPAWithMeta(c, notFoundPageMeta(base, siteName, keywords, path))
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}
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func notFoundPageMeta(base, siteName, keywords, path string) *embed_static.SPAPageMeta {
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return attachSiteSEO(&embed_static.SPAPageMeta{
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Title: pageTitle("页面不存在", siteName),
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Description: "您访问的页面不存在或已删除",
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Canonical: service.AbsoluteURL(base, path),
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OGType: "website",
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Robots: "noindex,follow",
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Status: http.StatusNotFound,
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}, siteName, keywords)
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}
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// attachSiteSEO 填充站点级 keywords / og:site_name / og:locale
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func attachSiteSEO(meta *embed_static.SPAPageMeta, siteName, keywords string) *embed_static.SPAPageMeta {
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if meta == nil {
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return nil
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}
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meta.SiteName = strings.TrimSpace(siteName)
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if strings.TrimSpace(meta.Keywords) == "" {
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meta.Keywords = strings.TrimSpace(keywords)
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}
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meta.Locale = "zh_CN"
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return meta
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}
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func isKnownPublicPath(path string) bool {
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switch path {
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case "/", "/login", "/register", "/compose", "/profile", "/favorites", "/projects", "/boards":
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return true
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}
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if seoPostEditRe.MatchString(path) {
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return true
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}
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return false
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}
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func (h *Handlers) buildSPAPageMeta(c *gin.Context, path string, brand service.SiteBranding, base, siteName, defaultImage string) *embed_static.SPAPageMeta {
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siteTitle := brand.DocumentTitle()
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homeDesc := service.TruncateRunes(brand.MetaDescription(), seoDescMax)
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siteKeywords := brand.MetaKeywords()
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meta := attachSiteSEO(&embed_static.SPAPageMeta{
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Title: siteTitle,
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Description: homeDesc,
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Keywords: siteKeywords,
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Canonical: service.AbsoluteURL(base, pathWithQuery(c)),
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OGType: "website",
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OGImage: defaultImage,
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}, siteName, siteKeywords)
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if isNoIndexPath(path) {
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meta.Robots = "noindex,nofollow"
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meta.Title = pageTitle(pathLabel(path), siteName)
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return meta
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}
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if path == "/" || path == "" {
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boardID, _ := strconv.ParseUint(c.Query("board"), 10, 64)
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if boardID > 0 {
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if board, err := h.Board.GetByID(uint(boardID)); err == nil {
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desc := strings.TrimSpace(board.Description)
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if desc == "" {
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desc = brand.MetaDescription()
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}
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meta.Title = pageTitle(board.Name, siteName)
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meta.Description = service.TruncateRunes(desc, seoDescMax)
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meta.Canonical = service.AbsoluteURL(base, service.QueryBoardHome(board.ID))
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meta.Keywords = service.JoinSEOKeywords(board.Name, siteKeywords)
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return meta
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}
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// 无效板块 id：仍显示首页，但可标记 noindex
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meta.Robots = "noindex,follow"
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return meta
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}
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meta.JSONLD = mustJSON(map[string]any{
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"@context": "https://schema.org",
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"@type": "WebSite",
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"name": siteName,
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"description": meta.Description,
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"url": service.AbsoluteURL(base, "/"),
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})
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}
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if path == "/projects" {
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meta.Title = pageTitle("项目", siteName)
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meta.Description = service.TruncateRunes(siteName+" 的公开项目列表", seoDescMax)
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meta.Keywords = service.JoinSEOKeywords("项目", siteKeywords)
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}
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return meta
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}
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func (h *Handlers) postPageMeta(base, siteName, defaultImage string, post *model.Post) *embed_static.SPAPageMeta {
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permalink := h.Settings.Permalink()
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content := service.RedactMembersOnlyHTML(post.Content)
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plain := post.ContentPlain
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if plain == "" {
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plain = service.StripHTMLForSearch(content)
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}
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desc := service.TruncateRunes(plain, seoDescMax)
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author := service.DisplayName(&post.User)
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canonical := service.AbsoluteURL(base, permalink.PostPath(post.ID))
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ogImage := service.AbsoluteURL(base, service.FirstImageURL(content))
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if ogImage == "" {
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ogImage = service.AbsoluteURL(base, post.User.Avatar)
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}
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if ogImage == "" {
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ogImage = defaultImage
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}
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jsonld := map[string]any{
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"@context": "https://schema.org",
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"@type": "DiscussionForumPosting",
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"headline": post.Title,
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"description": desc,
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"datePublished": post.CreatedAt.UTC().Format(time.RFC3339),
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"dateModified": post.UpdatedAt.UTC().Format(time.RFC3339),
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"url": canonical,
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"mainEntityOfPage": canonical,
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"author": map[string]any{
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"@type": "Person",
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"name": author,
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"url": service.AbsoluteURL(base, permalink.UserPath(post.UserID)),
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},
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"interactionStatistic": map[string]any{
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"@type": "InteractionCounter",
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"interactionType": "https://schema.org/ViewAction",
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"userInteractionCount": post.ViewCount,
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},
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}
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if post.Board.Name != "" {
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jsonld["articleSection"] = post.Board.Name
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}
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if ogImage != "" {
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jsonld["image"] = []string{ogImage}
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}
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body := service.TruncateRunes(plain, seoPrerenderMax)
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if body != "" {
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jsonld["articleBody"] = body
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}
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return &embed_static.SPAPageMeta{
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Title: pageTitle(post.Title, siteName),
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Description: desc,
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Canonical: canonical,
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OGType: "article",
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OGImage: ogImage,
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JSONLD: mustJSON(jsonld),
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}
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}
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func (h *Handlers) userPageMeta(base, siteName, defaultImage string, user *model.User) *embed_static.SPAPageMeta {
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permalink := h.Settings.Permalink()
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name := service.DisplayName(user)
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desc := strings.TrimSpace(user.Signature)
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if desc == "" {
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desc = name + " 的主页"
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}
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desc = service.TruncateRunes(desc, seoDescMax)
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canonical := service.AbsoluteURL(base, permalink.UserPath(user.ID))
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ogImage := service.AbsoluteURL(base, user.Avatar)
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if ogImage == "" {
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ogImage = defaultImage
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}
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jsonld := map[string]any{
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"@context": "https://schema.org",
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"@type": "ProfilePage",
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"url": canonical,
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"mainEntity": map[string]any{
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"@type": "Person",
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"name": name,
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"description": desc,
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"url": canonical,
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},
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}
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if ogImage != "" {
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jsonld["mainEntity"].(map[string]any)["image"] = ogImage
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}
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return &embed_static.SPAPageMeta{
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Title: pageTitle(name+" 的主页", siteName),
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Description: desc,
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Canonical: canonical,
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OGType: "profile",
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OGImage: ogImage,
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JSONLD: mustJSON(jsonld),
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}
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}
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func (h *Handlers) publicBaseURL(c *gin.Context) string {
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return h.Settings.SitePublicBaseURL(requestOrigin(c))
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}
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func requestOrigin(c *gin.Context) string {
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proto := c.GetHeader("X-Forwarded-Proto")
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if proto == "" {
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if c.Request.TLS != nil {
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proto = "https"
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} else {
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proto = "http"
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}
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}
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host := c.GetHeader("X-Forwarded-Host")
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if host == "" {
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host = c.Request.Host
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}
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if host == "" {
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return ""
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}
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return proto + "://" + host
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}
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func pathWithQuery(c *gin.Context) string {
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path := c.Request.URL.Path
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if path == "" {
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path = "/"
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}
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if q := c.Request.URL.RawQuery; q != "" {
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// 首页排序/搜索不作为 canonical；板块筛选保留
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if path == "/" {
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board := c.Query("board")
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if board != "" {
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return service.QueryBoardHome(uint(parseUintOrZero(board)))
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}
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return "/"
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}
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return path + "?" + q
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}
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return path
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}
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func parseUintOrZero(s string) uint64 {
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n, _ := strconv.ParseUint(s, 10, 64)
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return n
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}
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func isNoIndexPath(path string) bool {
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switch {
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case path == "/login", path == "/register", path == "/compose",
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path == "/profile", path == "/favorites":
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return true
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case strings.HasPrefix(path, "/admin"):
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return true
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case strings.HasSuffix(path, "/edit"):
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return true
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default:
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return false
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}
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}
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func pathLabel(path string) string {
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switch {
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case path == "/login":
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return "登录"
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case path == "/register":
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return "注册"
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case path == "/compose":
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return "发帖"
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case path == "/profile":
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return "个人中心"
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case path == "/favorites":
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return "我的收藏"
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case strings.HasSuffix(path, "/edit"):
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return "编辑帖子"
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case strings.HasPrefix(path, "/admin"):
|
||
return "管理后台"
|
||
default:
|
||
return ""
|
||
}
|
||
}
|
||
|
||
func pageTitle(page, siteName string) string {
|
||
page = strings.TrimSpace(page)
|
||
siteName = strings.TrimSpace(siteName)
|
||
switch {
|
||
case page == "" && siteName == "":
|
||
return "姜十三论坛"
|
||
case page == "":
|
||
return siteName
|
||
case siteName == "":
|
||
return page
|
||
default:
|
||
return page + " - " + siteName
|
||
}
|
||
}
|
||
|
||
func mustJSON(v any) string {
|
||
b, err := json.Marshal(v)
|
||
if err != nil {
|
||
return ""
|
||
}
|
||
return string(b)
|
||
}
|
||
|
||
func xmlEscape(s string) string {
|
||
r := strings.NewReplacer(
|
||
`&`, "&",
|
||
`<`, "<",
|
||
`>`, ">",
|
||
`"`, """,
|
||
`'`, "'",
|
||
)
|
||
return r.Replace(s)
|
||
}
|