我正在使用 Jeff Atwood 发现的代码清理我的 Htmlhere http://refactormycode.com/codes/333-sanitize-html
但我遇到的问题是当我将 Markdown 链接输入表单时(它们被删除)
<http://www.example.com>
这是我正在使用的代码。
private static Regex _tags = new Regex("<[^>]*(>|$)",
RegexOptions.Singleline | RegexOptions.ExplicitCapture | RegexOptions.Compiled);
private static Regex _whitelist = new Regex(@"
^</?(b(lockquote)?|code|d(d|t|l|el)|em|h(1|2|3)|i|kbd|li|ol|p(re)?|s(ub|up|trong|trike)?|ul)>$|
^<(b|h)r\s?/?>$",
RegexOptions.Singleline | RegexOptions.ExplicitCapture | RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace);
private static Regex _whitelist_a = new Regex(@"
^<a\s
href=""(\#\d+|(https?|ftp)://[-a-z0-9+&@#/%?=~_|!:,.;\(\)]+)""
(\stitle=""[^""<>]+"")?\s?>$|
^</a>$",
RegexOptions.Singleline | RegexOptions.ExplicitCapture | RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace);
private static Regex _whitelist_img = new Regex(@"
^<img\s
src=""https?://[-a-z0-9+&@#/%?=~_|!:,.;\(\)]+""
(\swidth=""\d{1,3}"")?
(\sheight=""\d{1,3}"")?
(\salt=""[^""<>]*"")?
(\stitle=""[^""<>]*"")?
\s?/?>$",
RegexOptions.Singleline | RegexOptions.ExplicitCapture | RegexOptions.Compiled | RegexOptions.IgnorePatternWhitespace);
/// <summary>
/// sanitize any potentially dangerous tags from the provided raw HTML input using
/// a whitelist based approach, leaving the "safe" HTML tags
/// CODESNIPPET:4100A61A-1711-4366-B0B0-144D1179A937
/// </summary>
public static string Sanitize(string html)
{
if (String.IsNullOrEmpty(html)) return html;
string tagname;
Match tag;
// match every HTML tag in the input
MatchCollection tags = _tags.Matches(html);
for (int i = tags.Count - 1; i > -1; i--)
{
tag = tags[i];
tagname = tag.Value.ToLowerInvariant();
if(!(_whitelist.IsMatch(tagname) || _whitelist_a.IsMatch(tagname) || _whitelist_img.IsMatch(tagname)))
{
html = html.Remove(tag.Index, tag.Length);
System.Diagnostics.Debug.WriteLine("tag sanitized: " + tagname);
}
}
return html;
}
是的,因为那不是有效的 HTML...所以代码正在执行它声称要做的事情。
由于 Markdown 允许嵌入 HTML,但 HTML 不允许(所有形式的)嵌入 Markdown,我建议您首先将 Markdown 转换为 HTML,然后then消毒它...
本文内容由网友自发贡献,版权归原作者所有,本站不承担相应法律责任。如您发现有涉嫌抄袭侵权的内容,请联系:hwhale#tublm.com(使用前将#替换为@)