golang中如何驗證輸入是否為有效的Html標籤

package main

import (
    "fmt"
    "golang.org/x/net/html"
    "strings"
)

func isValidHTMLTags(html string) bool {
    doc, err := html.Parse(strings.NewReader(html))
    if err != nil {
        fmt.Println(err)
        return false
    }
    for c := doc.FirstChild; c != nil; c = c.NextSibling {
        if c.Type == html.ElementNode {
            switch c.Data {
            case "a", "em", "strong":
                // 检查、、标签是否包含 href 和 title 属性
                if !containsAttributes(c, "href", "title") {
                    return false
                }
            case "img":
                // 检查标签是否包含 src、alt、和 title 属性
                if !containsAttributes(c, "src", "alt", "title") {
                    return false
                }
            default:
                // 其他不允许的标签
                return false
            }
        }
    }
    return true
}

func containsAttributes(n *html.Node, attrs ...string) bool {
    for _, attr := range attrs {
        found := false
        for _, a := range n.Attr {
            if a.Key == attr {
                found = true
                break
            }
        }
        if !found {
            return false
        }
    }
    return true
}

func main() {
    html1 := "
Hello, world!
"
    fmt.Println(isValidHTMLTags(html1))   // output: true

    html2 := ""
    fmt.Println(isValidHTMLTags(html2))   // output: false

    html3 := "Google"
    fmt.Println(isValidHTMLTags(html3))   // output: true

    html4 := ""
    fmt.Println(isValidHTMLTags(html4))   // output: true

    html5 := ""
    fmt.Println(isValidHTMLTags(html5))   // output: false
}

package main

import (
    "fmt"
    "github.com/microcosm-cc/bluemonday"
)

func main() {
    html := "
Hello, world!
"
    policy := bluemonday.StrictPolicy()
    sanitizedHTML := policy.Sanitize(html)
    fmt.Println(sanitizedHTML)   // output: 
Hello, world!
}