// Copyright 2017 The Gitea Authors. All rights reserved. // Copyright 2017 The Gogs Authors. All rights reserved. // Use of this source code is governed by a MIT-style // license that can be found in the LICENSE file. package markup import ( "bytes" "io" "regexp" "sync" "code.gitea.io/gitea/modules/setting" "github.com/microcosm-cc/bluemonday" ) // Sanitizer is a protection wrapper of *bluemonday.Policy which does not allow // any modification to the underlying policies once it's been created. type Sanitizer struct { policy *bluemonday.Policy init sync.Once } var sanitizer = &Sanitizer{} // NewSanitizer initializes sanitizer with allowed attributes based on settings. // Multiple calls to this function will only create one instance of Sanitizer during // entire application lifecycle. func NewSanitizer() { sanitizer.init.Do(func() { ReplaceSanitizer() }) } // ReplaceSanitizer replaces the current sanitizer to account for changes in settings func ReplaceSanitizer() { sanitizer.policy = bluemonday.UGCPolicy() // We only want to allow HighlightJS specific classes for code blocks sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`^language-[\w-]+$`)).OnElements("code") // Checkboxes sanitizer.policy.AllowAttrs("type").Matching(regexp.MustCompile(`^checkbox$`)).OnElements("input") sanitizer.policy.AllowAttrs("checked", "disabled", "readonly").OnElements("input") // Custom URL-Schemes sanitizer.policy.AllowURLSchemes(setting.Markdown.CustomURLSchemes...) // Allow keyword markup sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`^` + keywordClass + `$`)).OnElements("span") // Allow classes for anchors sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`ref-issue`)).OnElements("a") // Allow classes for task lists sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`task-list-item`)).OnElements("li") // Allow icons sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`^icon(\s+[\p{L}\p{N}_-]+)+$`)).OnElements("i") // Allow unlabelled labels sanitizer.policy.AllowNoAttrs().OnElements("label") // Allow classes for emojis sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`emoji`)).OnElements("img") // Allow icons, checkboxes and emojis on span sanitizer.policy.AllowAttrs("class").Matching(regexp.MustCompile(`^((icon(\s+[\p{L}\p{N}_-]+)+)|(ui checkbox)|(ui checked checkbox)|(emoji))$`)).OnElements("span") // Allow generally safe attributes generalSafeAttrs := []string{"abbr", "accept", "accept-charset", "accesskey", "action", "align", "alt", "aria-describedby", "aria-hidden", "aria-label", "aria-labelledby", "axis", "border", "cellpadding", "cellspacing", "char", "charoff", "charset", "checked", "clear", "cols", "colspan", "color", "compact", "coords", "datetime", "dir", "disabled", "enctype", "for", "frame", "headers", "height", "hreflang", "hspace", "ismap", "label", "lang", "maxlength", "media", "method", "multiple", "name", "nohref", "noshade", "nowrap", "open", "prompt", "readonly", "rel", "rev", "rows", "rowspan", "rules", "scope", "selected", "shape", "size", "span", "start", "summary", "tabindex", "target", "title", "type", "usemap", "valign", "value", "vspace", "width", "itemprop", } generalSafeElements := []string{ "h1", "h2", "h3", "h4", "h5", "h6", "h7", "h8", "br", "b", "i", "strong", "em", "a", "pre", "code", "img", "tt", "div", "ins", "del", "sup", "sub", "p", "ol", "ul", "table", "thead", "tbody", "tfoot", "blockquote", "dl", "dt", "dd", "kbd", "q", "samp", "var", "hr", "ruby", "rt", "rp", "li", "tr", "td", "th", "s", "strike", "summary", "details", "caption", "figure", "figcaption", "abbr", "bdo", "cite", "dfn", "mark", "small", "span", "time", "wbr", } sanitizer.policy.AllowAttrs(generalSafeAttrs...).OnElements(generalSafeElements...) sanitizer.policy.AllowAttrs("itemscope", "itemtype").OnElements("div") // FIXME: Need to handle longdesc in img but there is no easy way to do it // Custom keyword markup for _, rule := range setting.ExternalSanitizerRules { if rule.Regexp != nil { sanitizer.policy.AllowAttrs(rule.AllowAttr).Matching(rule.Regexp).OnElements(rule.Element) } else { sanitizer.policy.AllowAttrs(rule.AllowAttr).OnElements(rule.Element) } } } // Sanitize takes a string that contains a HTML fragment or document and applies policy whitelist. func Sanitize(s string) string { NewSanitizer() return sanitizer.policy.Sanitize(s) } // SanitizeReader sanitizes a Reader func SanitizeReader(r io.Reader) *bytes.Buffer { NewSanitizer() return sanitizer.policy.SanitizeReader(r) } // SanitizeBytes takes a []byte slice that contains a HTML fragment or document and applies policy whitelist. func SanitizeBytes(b []byte) []byte { if len(b) == 0 { // nothing to sanitize return b } NewSanitizer() return sanitizer.policy.SanitizeBytes(b) } ption> Nextcloud server, a safe home for all your data: https://github.com/nextcloud/serverwww-data
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