gitlin/utils/ugcpolicy.go

package utils

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

// copied from bluemonday's GitHub repostiory, with some adaptations
func UGCPolicy() *bluemonday.Policy {

	p := bluemonday.NewPolicy()

	///////////////////////
	// Global attributes //
	///////////////////////

	// "class" is not permitted as we are not allowing users to style their own
	// content

	p.AllowStandardAttributes()

	//////////////////////////////
	// Global URL format policy //
	//////////////////////////////

	p.AllowStandardURLs()

	////////////////////////////////
	// Declarations and structure //
	////////////////////////////////

	// "xml" "xslt" "DOCTYPE" "html" "head" are not permitted as we are
	// expecting user generated content to be a fragment of HTML and not a full
	// document.

	//////////////////////////
	// Sectioning root tags //
	//////////////////////////

	// "article" and "aside" are permitted and takes no attributes
	p.AllowElements("article", "aside")

	// "body" is not permitted as we are expecting user generated content to be a fragment
	// of HTML and not a full document.

	// "details" is permitted, including the "open" attribute which can either
	// be blank or the value "open".
	p.AllowAttrs(
		"open",
	).Matching(regexp.MustCompile(`(?i)^(|open)$`)).OnElements("details")

	// "fieldset" is not permitted as we are not allowing forms to be created.

	// "figure" is permitted and takes no attributes
	p.AllowElements("figure")

	// "nav" is not permitted as it is assumed that the site (and not the user)
	// has defined navigation elements

	// "section" is permitted and takes no attributes
	p.AllowElements("section")

	// "summary" is permitted and takes no attributes
	p.AllowElements("summary")

	//////////////////////////
	// Headings and footers //
	//////////////////////////

	// "footer" is not permitted as we expect user content to be a fragment and
	// not structural to this extent

	// "h1" through "h6" are permitted and take no attributes
	p.AllowElements("h1", "h2", "h3", "h4", "h5", "h6")

	// "header" is not permitted as we expect user content to be a fragment and
	// not structural to this extent

	// "hgroup" is permitted and takes no attributes
	p.AllowElements("hgroup")

	/////////////////////////////////////
	// Content grouping and separating //
	/////////////////////////////////////

	// "blockquote" is permitted, including the "cite" attribute which must be
	// a standard URL.
	p.AllowAttrs("cite").OnElements("blockquote")

	// "br" "div" "hr" "p" "span" "wbr" are permitted and take no attributes
	p.AllowElements("br", "div", "hr", "p", "span", "wbr")

	///////////
	// Links //
	///////////

	// "a" is permitted
	p.AllowAttrs("href").OnElements("a")

	// "area" is permitted along with the attributes that map image maps work
	p.AllowAttrs("name").Matching(
		regexp.MustCompile(`^([\p{L}\p{N}_-]+)$`),
	).OnElements("map")
	p.AllowAttrs("alt").Matching(bluemonday.Paragraph).OnElements("area")
	p.AllowAttrs("coords").Matching(
		regexp.MustCompile(`^([0-9]+,)+[0-9]+$`),
	).OnElements("area")
	p.AllowAttrs("href").OnElements("area")
	p.AllowAttrs("rel").Matching(bluemonday.SpaceSeparatedTokens).OnElements("area")
	p.AllowAttrs("shape").Matching(
		regexp.MustCompile(`(?i)^(default|circle|rect|poly)$`),
	).OnElements("area")

	// "img" is permitted
	p.AllowImages()
	p.AllowAttrs("usemap").Matching(
		regexp.MustCompile(`(?i)^#[\p{L}\p{N}_-]+$`),
	).OnElements("img")
	p.AllowAttrs("src").Matching(
		regexp.MustCompile(`(?i)^\/[\p{L}\p{N}\/\.]+$`),
	).OnElements("img")
	p.AllowAttrs("style").OnElements("img")
	p.AllowAttrs("alt").OnElements("img")

	// "link" is not permitted

	/////////////////////
	// Phrase elements //
	/////////////////////

	// The following are all inline phrasing elements
	p.AllowElements("abbr", "acronym", "cite", "code", "dfn", "em",
		"figcaption", "mark", "s", "samp", "strong", "sub", "sup", "var")

	// "q" is permitted and "cite" is a URL and handled by URL policies
	p.AllowAttrs("cite").OnElements("q")

	// "time" is permitted
	p.AllowAttrs("datetime").Matching(bluemonday.ISO8601).OnElements("time")

	////////////////////
	// Style elements //
	////////////////////

	// block and inline elements that impart no semantic meaning but style the
	// document
	p.AllowElements("b", "i", "pre", "small", "strike", "tt", "u")

	// "style" is not permitted as we are not yet sanitising CSS and it is an
	// XSS attack vector

	//////////////////////
	// HTML5 Formatting //
	//////////////////////

	// "bdi" "bdo" are permitted
	p.AllowAttrs("dir").Matching(bluemonday.Direction).OnElements("bdi", "bdo")

	// "rp" "rt" "ruby" are permitted
	p.AllowElements("rp", "rt", "ruby")

	///////////////////////////
	// HTML5 Change tracking //
	///////////////////////////

	// "del" "ins" are permitted
	p.AllowAttrs("cite").Matching(bluemonday.Paragraph).OnElements("del", "ins")
	p.AllowAttrs("datetime").Matching(bluemonday.ISO8601).OnElements("del", "ins")

	///////////
	// Lists //
	///////////

	p.AllowLists()

	////////////
	// Tables //
	////////////

	p.AllowTables()

	///////////
	// Forms //
	///////////

	// By and large, forms are not permitted. However there are some form
	// elements that can be used to present data, and we do permit those
	//
	// "button" "fieldset" "input" "keygen" "label" "output" "select" "datalist"
	// "textarea" "optgroup" "option" are all not permitted

	// "meter" is permitted
	p.AllowAttrs(
		"value",
		"min",
		"max",
		"low",
		"high",
		"optimum",
	).Matching(bluemonday.Number).OnElements("meter")

	// "progress" is permitted
	p.AllowAttrs("value", "max").Matching(bluemonday.Number).OnElements("progress")

	return p
}