初始提交：姜十三论坛 Jiang13 Forum

轻量自用论坛，Go 单二进制 + React SPA 内嵌 + SQLite。

Co-authored-by: Cursor <cursoragent@cursor.com>

service/content.go

@@ -0,0 +1,37 @@
+package service
+
+import (
+	"regexp"
+	"strconv"
+	"strings"
+	"unicode/utf8"
+)
+
+var (
+	membersOnlyBlockRe = regexp.MustCompile(`(?is)<members-only\b[^>]*>([\s\S]*?)</members-only>`)
+	htmlTagRe          = regexp.MustCompile(`<[^>]+>`)
+)
+
+// RedactMembersOnlyHTML 未登录时移除会员专属区块内的正文，保留长度提示供前端展示
+func RedactMembersOnlyHTML(html string) string {
+	if html == "" {
+		return html
+	}
+	return membersOnlyBlockRe.ReplaceAllStringFunc(html, func(full string) string {
+		m := membersOnlyBlockRe.FindStringSubmatch(full)
+		inner := ""
+		if len(m) > 1 {
+			inner = m[1]
+		}
+		length := membersContentLength(inner)
+		return `<members-only data-locked="true" data-length="` + strconv.Itoa(length) + `"></members-only>`
+	})
+}
+
+func membersContentLength(html string) int {
+	text := strings.TrimSpace(htmlTagRe.ReplaceAllString(html, ""))
+	if text == "" {
+		return 0
+	}
+	return utf8.RuneCountInString(text)
+}