159 lines
5.6 KiB
Go
159 lines
5.6 KiB
Go
package handler
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import (
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"fmt"
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"html"
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"strings"
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"time"
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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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// 爬虫专用伪静态 HTML（无 SPA；仅 User-Agent 命中爬虫时返回，避免用户刷新闪屏）
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func renderBotHTML(meta *embed_static.SPAPageMeta, bodyInner string) string {
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if meta == nil {
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meta = &embed_static.SPAPageMeta{}
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}
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ogType := strings.TrimSpace(meta.OGType)
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if ogType == "" {
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ogType = "website"
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}
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locale := strings.TrimSpace(meta.Locale)
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if locale == "" {
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locale = "zh_CN"
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}
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var b strings.Builder
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b.WriteString("<!DOCTYPE html><html lang=\"zh-CN\"><head>")
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b.WriteString("<meta charset=\"UTF-8\"/>")
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b.WriteString("<meta name=\"viewport\" content=\"width=device-width, initial-scale=1.0\"/>")
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writeEscapedTag(&b, "title", meta.Title)
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writeEscapedMeta(&b, "name", "description", meta.Description)
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writeEscapedMeta(&b, "name", "keywords", meta.Keywords)
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if meta.Robots != "" {
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writeEscapedMeta(&b, "name", "robots", meta.Robots)
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}
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if meta.Canonical != "" {
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b.WriteString(`<link rel="canonical" href="` + html.EscapeString(meta.Canonical) + `"/>`)
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}
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writeEscapedMeta(&b, "property", "og:type", ogType)
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writeEscapedMeta(&b, "property", "og:site_name", meta.SiteName)
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writeEscapedMeta(&b, "property", "og:locale", locale)
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writeEscapedMeta(&b, "property", "og:title", meta.Title)
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writeEscapedMeta(&b, "property", "og:description", meta.Description)
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writeEscapedMeta(&b, "property", "og:url", meta.Canonical)
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writeEscapedMeta(&b, "property", "og:image", meta.OGImage)
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card := "summary"
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if strings.TrimSpace(meta.OGImage) != "" {
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card = "summary_large_image"
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}
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writeEscapedMeta(&b, "name", "twitter:card", card)
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writeEscapedMeta(&b, "name", "twitter:title", meta.Title)
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writeEscapedMeta(&b, "name", "twitter:description", meta.Description)
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writeEscapedMeta(&b, "name", "twitter:image", meta.OGImage)
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if meta.JSONLD != "" {
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b.WriteString(`<script type="application/ld+json">`)
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b.WriteString(meta.JSONLD)
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b.WriteString(`</script>`)
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}
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b.WriteString(`<style>
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body{font-family:system-ui,sans-serif;line-height:1.6;max-width:800px;margin:24px auto;padding:0 16px;color:#222}
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a{color:#2d6a4f}img{max-width:100%;height:auto}
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.meta{color:#666;font-size:14px;margin:8px 0 20px}
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.nav{margin:32px 0;font-size:14px}
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</style>`)
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b.WriteString("</head><body>")
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b.WriteString(bodyInner)
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b.WriteString(`<p class="nav"><a href="/">← 返回首页</a></p>`)
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b.WriteString("</body></html>")
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return b.String()
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}
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func writeEscapedTag(b *strings.Builder, tag, text string) {
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text = strings.TrimSpace(text)
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if text == "" {
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return
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}
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b.WriteString("<" + tag + ">" + html.EscapeString(text) + "</" + tag + ">")
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}
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func writeEscapedMeta(b *strings.Builder, attr, key, content string) {
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content = strings.TrimSpace(content)
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if content == "" {
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return
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}
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b.WriteString("<meta " + attr + "=\"" + html.EscapeString(key) + "\" content=\"" + html.EscapeString(content) + "\"/>")
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}
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func (h *Handlers) botBoardHTML(meta *embed_static.SPAPageMeta, board model.Board) string {
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desc := strings.TrimSpace(board.Description)
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if desc == "" {
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desc = meta.Description
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}
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body := fmt.Sprintf(`<h1>%s</h1><p class="meta">%s</p>`,
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html.EscapeString(board.Name),
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html.EscapeString(desc),
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)
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return renderBotHTML(meta, body)
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}
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func (h *Handlers) botHomeHTML(meta *embed_static.SPAPageMeta, brand service.SiteBranding) string {
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name := strings.TrimSpace(brand.Name)
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if name == "" {
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name = "姜十三论坛"
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}
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intro := brand.MetaDescription()
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if intro == "" {
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intro = brand.Slogan
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}
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var body strings.Builder
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body.WriteString("<h1>" + html.EscapeString(name) + "</h1>")
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if intro != "" {
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body.WriteString("<p>" + html.EscapeString(intro) + "</p>")
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}
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body.WriteString(`<p><a href="/projects">浏览项目</a></p>`)
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return renderBotHTML(meta, body.String())
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}
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func (h *Handlers) botPostHTML(base, siteName, defaultImage, keywords string, post *model.Post) string {
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meta := attachSiteSEO(h.postPageMeta(base, siteName, defaultImage, post), siteName, keywords)
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content := service.SanitizePostHTML(service.RedactGatedPostHTML(post.Content))
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author := service.DisplayName(&post.User)
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var body strings.Builder
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body.WriteString("<article>")
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body.WriteString("<h1>" + html.EscapeString(post.Title) + "</h1>")
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body.WriteString(`<p class="meta">`)
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body.WriteString(html.EscapeString(author))
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body.WriteString(" · ")
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body.WriteString(html.EscapeString(post.CreatedAt.Local().Format("2006-01-02 15:04")))
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if post.Board.Name != "" {
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body.WriteString(" · ")
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body.WriteString(html.EscapeString(post.Board.Name))
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}
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body.WriteString("</p>")
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body.WriteString(content)
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body.WriteString("</article>")
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return renderBotHTML(meta, body.String())
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}
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func (h *Handlers) botUserHTML(base, siteName, defaultImage, keywords string, user *model.User) string {
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meta := attachSiteSEO(h.userPageMeta(base, siteName, defaultImage, user), siteName, keywords)
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name := service.DisplayName(user)
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sig := strings.TrimSpace(user.Signature)
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var body strings.Builder
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body.WriteString("<h1>" + html.EscapeString(name) + " 的主页</h1>")
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if sig != "" {
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body.WriteString("<p>" + html.EscapeString(sig) + "</p>")
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}
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body.WriteString(fmt.Sprintf(`<p class="meta">加入于 %s</p>`, html.EscapeString(user.CreatedAt.Local().Format(time.DateOnly))))
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return renderBotHTML(meta, body.String())
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}
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func botNotFoundHTML(base, siteName, keywords, path string) string {
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meta := notFoundPageMeta(base, siteName, keywords, path)
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body := `<h1>页面不存在</h1><p>您访问的页面不存在或已删除。</p>`
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return renderBotHTML(meta, body)
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}
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