bluemonday

package module
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 Go to latest Published: Mar 6, 2016 License: BSD-3-Clause Imports: 7 Imported by: 2

README

bluemonday Build Status

bluemonday is a HTML sanitizer implemented in Go. It is fast and highly configurable.

bluemonday takes untrusted user generated content as an input, and will return HTML that has been sanitised against a whitelist of approved HTML elements and attributes so that you can safely include the content in your web page.

If you accept user generated content, and your server uses Go, you need bluemonday.

Why this fork?

This fork of bluemonday was created in an attempt to make the sanitizing process a little bit more flexible.

Normally with bluemonday, if your user provides you with bad content (bluemonday.UGCPolicy().Sanitize()) turns this:

Hello <STYLE>.XSS{background-image:url("javascript:alert('XSS')");}</STYLE><A CLASS=XSS></A>World

Into a harmless:

Hello World

But what if you are looking for something a little more flexible? I frequently wish there was an option to, instead, turn the code into this:

Hello &lt;style&gt;.XSS{background-image:url(&#34;javascript:alert(&#39;XSS&#39;)&#34;);}&lt;/style&gt;&lt;a class="XSS"&gt;&lt;/a&gt;World

Which will visually render to the original text on the screen without having to sacrifice the functionality of allowed tags.

But what about invalid attributes within the whitelisted tags? For this, we have opted to simply strip out the attribute and leave the valid parts intact.

This means that if your users try to provide you with this bad content:

<b onclick="alert('XSS')">Hello</b> world!

You will be delighted to see that it is sanitized to a safe

<b>Hello</b> world!

Usage

All of the original policies are still available with this fork. The original usage is described in their github page

For WYSIWYG, install in your ${GOPATH} using go get -u github.com/cosban/bluemonday

Then call it:

package main

import (
	"fmt"

	"github.com/microcosm-cc/bluemonday"
)

func main() {
	p := bluemonday.WYSIWYGPolicy()
	html := p.Sanitize(
		`<a onblur="alert(secret)" href="http://www.google.com">Google</a>`,
	)

	// Output:
	// <a href="http://www.google.com" rel="nofollow">Google</a>
	fmt.Println(html)
}

You are able to use all three of the original methods to sanitize with this addition.

p.Sanitize(string) string
p.SanitizeBytes([]byte) []byte
p.SanitizeReader(io.Reader) bytes.Buffer

TODO

  • More extensive tests to ensure there are not any cases being left out.
  • Keep up-to-date with the original bluemonday
  • Possibly submit a pull request for this after more testing.

Documentation

Overview

Package bluemonday provides a way of describing a whitelist of HTML elements and attributes as a policy, and for that policy to be applied to untrusted strings from users that may contain markup. All elements and attributes not on the whitelist will be stripped.

The default bluemonday.UGCPolicy().Sanitize() turns this: 

Hello <STYLE>.XSS{background-image:url("javascript:alert('XSS')");}</STYLE><A CLASS=XSS></A>World

Into the more harmless: 

Hello World

And it turns this: 

<a href="javascript:alert('XSS1')" onmouseover="alert('XSS2')">XSS<a>

Into this: 

XSS

Whilst still allowing this: 

<a href="http://www.google.com/">
  <img src="https://ssl.gstatic.com/accounts/ui/logo_2x.png"/>
</a>

To pass through mostly unaltered (it gained a rel="nofollow"): 

<a href="http://www.google.com/" rel="nofollow">
  <img src="https://ssl.gstatic.com/accounts/ui/logo_2x.png"/>
</a>

The primary purpose of bluemonday is to take potentially unsafe user generated content (from things like Markdown, HTML WYSIWYG tools, etc) and make it safe for you to put on your website.

It protects sites against XSS (http://en.wikipedia.org/wiki/Cross-site_scripting) and other malicious content that a user interface may deliver. There are many vectors for an XSS attack (https://www.owasp.org/index.php/XSS_Filter_Evasion_Cheat_Sheet) and the safest thing to do is to sanitize user input against a known safe list of HTML elements and attributes.

Note: You should always run bluemonday after any other processing.

If you use blackfriday (https://github.com/russross/blackfriday) or Pandoc (http://johnmacfarlane.net/pandoc/) then bluemonday should be run after these steps. This ensures that no insecure HTML is introduced later in your process.

bluemonday is heavily inspired by both the OWASP Java HTML Sanitizer (https://code.google.com/p/owasp-java-html-sanitizer/) and the HTML Purifier (http://htmlpurifier.org/).

We ship two default policies, one is bluemonday.StrictPolicy() and can be thought of as equivalent to stripping all HTML elements and their attributes as it has nothing on it's whitelist.

The other is bluemonday.UGCPolicy() and allows a broad selection of HTML elements and attributes that are safe for user generated content. Note that this policy does not whitelist iframes, object, embed, styles, script, etc.

The essence of building a policy is to determine which HTML elements and attributes are considered safe for your scenario. OWASP provide an XSS prevention cheat sheet ( https://www.google.com/search?q=xss+prevention+cheat+sheet ) to help explain the risks, but essentially:

  1. Avoid whitelisting anything other than plain HTML elements
  2. Avoid whitelisting `script`, `style`, `iframe`, `object`, `embed`, `base` elements
  3. Avoid whitelisting anything other than plain HTML elements with simple values that you can match to a regexp
Example 
package main

import (
	"fmt"
	"regexp"

	"github.com/cosban/bluemonday"
)

func main() {
	// Create a new policy
	p := bluemonday.NewPolicy()

	// Add elements to a policy without attributes
	p.AllowElements("b", "strong")

	// Add elements as a virtue of adding an attribute
	p.AllowAttrs("nowrap").OnElements("td", "th")

	// Attributes can either be added to all elements
	p.AllowAttrs("dir").Globally()

	//Or attributes can be added to specific elements
	p.AllowAttrs("value").OnElements("li")

	// It is ALWAYS recommended that an attribute be made to match a pattern
	// XSS in HTML attributes is a very easy attack vector

	// \p{L} matches unicode letters, \p{N} matches unicode numbers
	p.AllowAttrs("title").Matching(regexp.MustCompile(`[\p{L}\p{N}\s\-_',:\[\]!\./\\\(\)&]*`)).Globally()

	// You can stop at any time and call .Sanitize()

	// Assumes that string htmlIn was passed in from a HTTP POST and contains
	// untrusted user generated content
	htmlIn := `untrusted user generated content <body onload="alert('XSS')">`
	fmt.Println(p.Sanitize(htmlIn))

	// And you can take any existing policy and extend it
	p = bluemonday.UGCPolicy()
	p.AllowElements("fieldset", "select", "option")

	// Links are complex beasts and one of the biggest attack vectors for
	// malicious content so we have included features specifically to help here.

	// This is not recommended:
	p = bluemonday.NewPolicy()
	p.AllowAttrs("href").Matching(regexp.MustCompile(`(?i)mailto|https?`)).OnElements("a")

	// The regexp is insufficient in this case to have prevented a malformed
	// value doing something unexpected.

	// This will ensure that URLs are not considered invalid by Go's net/url
	// package.
	p.RequireParseableURLs(true)

	// If you have enabled parseable URLs then the following option will allow
	// relative URLs. By default this is disabled and will prevent all local and
	// schema relative URLs (i.e. `href="//www.google.com"` is schema relative).
	p.AllowRelativeURLs(true)

	// If you have enabled parseable URLs then you can whitelist the schemas
	// that are permitted. Bear in mind that allowing relative URLs in the above
	// option allows for blank schemas.
	p.AllowURLSchemes("mailto", "http", "https")

	// Regardless of whether you have enabled parseable URLs, you can force all
	// URLs to have a rel="nofollow" attribute. This will be added if it does
	// not exist.

	// This applies to "a" "area" "link" elements that have a "href" attribute
	p.RequireNoFollowOnLinks(true)

	// We provide a convenience function that applies all of the above, but you
	// will still need to whitelist the linkable elements:
	p = bluemonday.NewPolicy()
	p.AllowStandardURLs()
	p.AllowAttrs("cite").OnElements("blockquote")
	p.AllowAttrs("href").OnElements("a", "area")
	p.AllowAttrs("src").OnElements("img")

	// Policy Building Helpers

	// If you've got this far and you're bored already, we also bundle some
	// other convenience functions
	p = bluemonday.NewPolicy()
	p.AllowStandardAttributes()
	p.AllowImages()
	p.AllowLists()
	p.AllowTables()
}

Output:

Index

Examples

Constants

This section is empty.

Variables

View Source 
var (
	// CellAlign handles the `align` attribute
	// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td#attr-align
	CellAlign = regexp.MustCompile(`(?i)^(center|justify|left|right|char)$`)

	// CellVerticalAlign handles the `valign` attribute
	// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td#attr-valign
	CellVerticalAlign = regexp.MustCompile(`(?i)^(baseline|bottom|middle|top)$`)

	// Direction handles the `dir` attribute
	// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/bdo#attr-dir
	Direction = regexp.MustCompile(`(?i)^(rtl|ltr)$`)

	// ImageAlign handles the `align` attribute on the `image` tag
	// http://www.w3.org/MarkUp/Test/Img/imgtest.html
	ImageAlign = regexp.MustCompile(
		`(?i)^(left|right|top|texttop|middle|absmiddle|baseline|bottom|absbottom)$`,
	)

	// Integer describes whole positive integers (including 0) used in places
	// like td.colspan
	// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/td#attr-colspan
	Integer = regexp.MustCompile(`^[0-9]+$`)

	// ISO8601 according to the W3 group is only a subset of the ISO8601
	// standard: http://www.w3.org/TR/NOTE-datetime
	//
	// Used in places like time.datetime
	// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/time#attr-datetime
	//
	// Matches patterns:
	//  Year:
	//     YYYY (eg 1997)
	//  Year and month:
	//     YYYY-MM (eg 1997-07)
	//  Complete date:
	//     YYYY-MM-DD (eg 1997-07-16)
	//  Complete date plus hours and minutes:
	//     YYYY-MM-DDThh:mmTZD (eg 1997-07-16T19:20+01:00)
	//  Complete date plus hours, minutes and seconds:
	//     YYYY-MM-DDThh:mm:ssTZD (eg 1997-07-16T19:20:30+01:00)
	//  Complete date plus hours, minutes, seconds and a decimal fraction of a
	//  second
	//      YYYY-MM-DDThh:mm:ss.sTZD (eg 1997-07-16T19:20:30.45+01:00)
	ISO8601 = regexp.MustCompile(
		`^[0-9]{4}(-[0-9]{2}(-[0-9]{2}([ T][0-9]{2}(:[0-9]{2}){1,2}(.[0-9]{1,6})` +
			`?Z?([\+-][0-9]{2}:[0-9]{2})?)?)?)?$`,
	)

	// ListType encapsulates the common value as well as the latest spec
	// values for lists
	// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/ol#attr-type
	ListType = regexp.MustCompile(`(?i)^(circle|disc|square|a|A|i|I|1)$`)

	// SpaceSeparatedTokens is used in places like `a.rel` and the common attribute
	// `class` which both contain space delimited lists of data tokens
	// http://www.w3.org/TR/html-markup/datatypes.html#common.data.tokens-def
	// Regexp: \p{L} matches unicode letters, \p{N} matches unicode numbers
	SpaceSeparatedTokens = regexp.MustCompile(`^([\s\p{L}\p{N}_-]+)$`)

	// Number is a double value used on HTML5 meter and progress elements
	// http://www.whatwg.org/specs/web-apps/current-work/multipage/the-button-element.html#the-meter-element
	Number = regexp.MustCompile(`^[-+]?[0-9]*\.?[0-9]+([eE][-+]?[0-9]+)?$`)

	// NumberOrPercent is used predominantly as units of measurement in width
	// and height attributes
	// https://developer.mozilla.org/en-US/docs/Web/HTML/Element/img#attr-height
	NumberOrPercent = regexp.MustCompile(`^[0-9]+[%]?$`)

	// Paragraph of text in an attribute such as *.'title', img.alt, etc
	// https://developer.mozilla.org/en-US/docs/Web/HTML/Global_attributes#attr-title
	// Note that we are not allowing chars that could close tags like '>'
	Paragraph = regexp.MustCompile(`^[\p{L}\p{N}\s\-_',\[\]!\./\\\(\)]*$`)
)

A selection of regular expressions that can be used as .Matching() rules on HTML attributes.

Functions

This section is empty.

Types

type Policy 

type Policy struct {
	// contains filtered or unexported fields
}

Policy encapsulates the whitelist of HTML elements and attributes that will be applied to the sanitised HTML.

You should use bluemonday.NewPolicy() to create a blank policy as the unexported fields contain maps that need to be initialized.

func NewPolicy 

func NewPolicy() *Policy

NewPolicy returns a blank policy with nothing whitelisted or permitted. This is the recommended way to start building a policy and you should now use AllowAttrs() and/or AllowElements() to construct the whitelist of HTML elements and attributes.

Example 
package main

import (
	"fmt"

	"github.com/cosban/bluemonday"
)

func main() {
	// NewPolicy is a blank policy and we need to explicitly whitelist anything
	// that we wish to allow through
	p := bluemonday.NewPolicy()

	// We ensure any URLs are parseable and have rel="nofollow" where applicable
	p.AllowStandardURLs()

	// AllowStandardURLs already ensures that the href will be valid, and so we
	// can skip the .Matching()
	p.AllowAttrs("href").OnElements("a")

	// We allow paragraphs too
	p.AllowElements("p")

	html := p.Sanitize(
		`<p><a onblur="alert(secret)" href="http://www.google.com">Google</a></p>`,
	)

	fmt.Println(html)

}

Output:

<p><a href="http://www.google.com" rel="nofollow">Google</a></p>

func StrictPolicy 

func StrictPolicy() *Policy

StrictPolicy returns an empty policy, which will effectively strip all HTML elements and their attributes from a document.

Example 
package main

import (
	"fmt"

	"github.com/cosban/bluemonday"
)

func main() {
	// StrictPolicy is equivalent to NewPolicy and as nothing else is declared
	// we are stripping all elements (and their attributes)
	p := bluemonday.StrictPolicy()

	html := p.Sanitize(
		`Goodbye <a onblur="alert(secret)" href="http://en.wikipedia.org/wiki/Goodbye_Cruel_World_(Pink_Floyd_song)">Cruel</a> World`,
	)

	fmt.Println(html)

}

Output:

Goodbye Cruel World

func StripTagsPolicy 

func StripTagsPolicy() *Policy

StripTagsPolicy is DEPRECATED. Use StrictPolicy instead.

func UGCPolicy 

func UGCPolicy() *Policy

UGCPolicy returns a policy aimed at user generated content that is a result of HTML WYSIWYG tools and Markdown conversions.

This is expected to be a fairly rich document where as much markup as possible should be retained. Markdown permits raw HTML so we are basically providing a policy to sanitise HTML5 documents safely but with the least intrusion on the formatting expectations of the user.

Example 
package main

import (
	"fmt"

	"github.com/cosban/bluemonday"
)

func main() {
	// UGCPolicy is a convenience policy for user generated content.
	p := bluemonday.UGCPolicy()

	html := p.Sanitize(
		`<a onblur="alert(secret)" href="http://www.google.com">Google</a>`,
	)

	fmt.Println(html)

}

Output:

<a href="http://www.google.com" rel="nofollow">Google</a>

func WYSIWYGPolicy 

func WYSIWYGPolicy() *Policy

WYSIWYGPolicy returns a Strictlike policy aimed at preventing content from being stripped.

Instead of stripping tags completely untrusted tag sets will have their angle brackets replaced with &lt; and &gt;

Example 
package main

import (
	"fmt"

	"github.com/cosban/bluemonday"
)

func main() {
	p := bluemonday.WYSIWYGPolicy()
	html := p.Sanitize(
		`<a onblur="alert(secret)" href="http://www.google.com">Google</a>`,
	)

	fmt.Println(html)
}

Output:

&lt;a onblur="alert(secret)" href="http://www.google.com"&gt;Google&lt;/a&gt;

func (p *Policy) AddTargetBlankToFullyQualifiedLinks(require bool) *Policy

AddTargetBlankToFullyQualifiedLinks will result in all <a> tags that point to a non-local destination (i.e. starts with a protocol and has a host) having a target="_blank" added to them if one does not already exist

Note: This requires p.RequireParseableURLs(true) and will enable it.

func (*Policy) AllowAttrs 

func (p *Policy) AllowAttrs(attrNames ...string) *attrPolicyBuilder

AllowAttrs takes a range of HTML attribute names and returns an attribute policy builder that allows you to specify the pattern and scope of the whitelisted attribute.

The attribute policy is only added to the core policy when either Globally() or OnElements(...) are called.

Example 
package main

import (
	"github.com/cosban/bluemonday"
)

func main() {
	p := bluemonday.NewPolicy()

	// Allow the 'title' attribute on every HTML element that has been
	// whitelisted
	p.AllowAttrs("title").Matching(bluemonday.Paragraph).Globally()

	// Allow the 'abbr' attribute on only the 'td' and 'th' elements.
	p.AllowAttrs("abbr").Matching(bluemonday.Paragraph).OnElements("td", "th")

	// Allow the 'colspan' and 'rowspan' attributes, matching a positive integer
	// pattern, on only the 'td' and 'th' elements.
	p.AllowAttrs("colspan", "rowspan").Matching(
		bluemonday.Integer,
	).OnElements("td", "th")
}

Output:

func (*Policy) AllowDataURIImages 

func (p *Policy) AllowDataURIImages()

AllowDataURIImages permits the use of inline images defined in RFC2397 http://tools.ietf.org/html/rfc2397 http://en.wikipedia.org/wiki/Data_URI_scheme

Images must have a mimetype matching: 

image/gif
image/jpeg
image/png
image/webp

NOTE: There is a potential security risk to allowing data URIs and you should only permit them on content you already trust. http://palizine.plynt.com/issues/2010Oct/bypass-xss-filters/ https://capec.mitre.org/data/definitions/244.html

func (*Policy) AllowDocType 

func (p *Policy) AllowDocType(allow bool) *Policy

AllowDocType states whether the HTML sanitised by the sanitizer is allowed to contain the HTML DocType tag: <!DOCTYPE HTML> or one of it's variants.

The HTML spec only permits one doctype per document, and as you know how you are using the output of this, you know best as to whether we should ignore it (default) or not.

If you are sanitizing a HTML fragment the default (false) is fine.

func (*Policy) AllowElements 

func (p *Policy) AllowElements(names ...string) *Policy

AllowElements will append HTML elements to the whitelist without applying an attribute policy to those elements (the elements are permitted sans-attributes)

Example 
package main

import (
	"github.com/cosban/bluemonday"
)

func main() {
	p := bluemonday.NewPolicy()

	// Allow styling elements without attributes
	p.AllowElements("br", "div", "hr", "p", "span")
}

Output:

func (*Policy) AllowImages 

func (p *Policy) AllowImages()

AllowImages enables the img element and some popular attributes. It will also ensure that URL values are parseable. This helper does not enable data URI images, for that you should also use the AllowDataURIImages() helper.

func (*Policy) AllowLists 

func (p *Policy) AllowLists()

AllowLists will enabled ordered and unordered lists, as well as definition lists

func (*Policy) AllowNoAttrs 

func (p *Policy) AllowNoAttrs() *attrPolicyBuilder

AllowNoAttrs says that attributes on element are optional.

The attribute policy is only added to the core policy when OnElements(...) are called.

func (*Policy) AllowRelativeURLs 

func (p *Policy) AllowRelativeURLs(require bool) *Policy

AllowRelativeURLs enables RequireParseableURLs and then permits URLs that are parseable, have no schema information and url.IsAbs() returns false This permits local URLs

func (*Policy) AllowStandardAttributes 

func (p *Policy) AllowStandardAttributes()

AllowStandardAttributes will enable "id", "title" and the language specific attributes "dir" and "lang" on all elements that are whitelisted

func (*Policy) AllowStandardURLs 

func (p *Policy) AllowStandardURLs()

AllowStandardURLs is a convenience function that will enable rel="nofollow" on "a", "area" and "link" (if you have allowed those elements) and will ensure that the URL values are parseable and either relative or belong to the "mailto", "http", or "https" schemes

func (*Policy) AllowStyling 

func (p *Policy) AllowStyling()

AllowStyling presently enables the class attribute globally.

Note: When bluemonday ships a CSS parser and we can safely sanitise that, this will also allow sanitized styling of elements via the style attribute.

func (*Policy) AllowTables 

func (p *Policy) AllowTables()

AllowTables will enable a rich set of elements and attributes to describe HTML tables

func (*Policy) AllowURLSchemeWithCustomPolicy 

func (p *Policy) AllowURLSchemeWithCustomPolicy(
	scheme string,
	urlPolicy func(url *url.URL) (allowUrl bool),
) *Policy

AllowURLSchemeWithCustomPolicy will append URL schemes with a custom URL policy to the whitelist. Only the URLs with matching schema and urlPolicy(url) returning true will be allowed.

func (*Policy) AllowURLSchemes 

func (p *Policy) AllowURLSchemes(schemes ...string) *Policy

AllowURLSchemes will append URL schemes to the whitelist Example: p.AllowURLSchemes("mailto", "http", "https") 

func (p *Policy) RequireNoFollowOnFullyQualifiedLinks(require bool) *Policy

RequireNoFollowOnFullyQualifiedLinks will result in all <a> tags that point to a non-local destination (i.e. starts with a protocol and has a host) having a rel="nofollow" added to them if one does not already exist

Note: This requires p.RequireParseableURLs(true) and will enable it. 

func (p *Policy) RequireNoFollowOnLinks(require bool) *Policy

RequireNoFollowOnLinks will result in all <a> tags having a rel="nofollow" added to them if one does not already exist

Note: This requires p.RequireParseableURLs(true) and will enable it.

func (*Policy) RequireParseableURLs 

func (p *Policy) RequireParseableURLs(require bool) *Policy

RequireParseableURLs will result in all URLs requiring that they be parseable by "net/url" url.Parse() This applies to: - a.href - area.href - blockquote.cite - img.src - link.href - script.src

func (*Policy) Sanitize 

func (p *Policy) Sanitize(s string) string

Sanitize takes a string that contains a HTML fragment or document and applies the given policy whitelist.

It returns a HTML string that has been sanitized by the policy or an empty string if an error has occurred (most likely as a consequence of extremely malformed input)

Example 
package main

import (
	"fmt"

	"github.com/cosban/bluemonday"
)

func main() {
	// UGCPolicy is a convenience policy for user generated content.
	p := bluemonday.UGCPolicy()

	// string in, string out
	html := p.Sanitize(`<a onblur="alert(secret)" href="http://www.google.com">Google</a>`)

	fmt.Println(html)

}

Output:

<a href="http://www.google.com" rel="nofollow">Google</a>

func (*Policy) SanitizeBytes 

func (p *Policy) SanitizeBytes(b []byte) []byte

SanitizeBytes takes a []byte that contains a HTML fragment or document and applies the given policy whitelist.

It returns a []byte containing the HTML that has been sanitized by the policy or an empty []byte if an error has occurred (most likely as a consequence of extremely malformed input)

Example 
package main

import (
	"fmt"

	"github.com/cosban/bluemonday"
)

func main() {
	// UGCPolicy is a convenience policy for user generated content.
	p := bluemonday.UGCPolicy()

	// []byte in, []byte out
	b := []byte(`<a onblur="alert(secret)" href="http://www.google.com">Google</a>`)
	b = p.SanitizeBytes(b)

	fmt.Println(string(b))

}

Output:

<a href="http://www.google.com" rel="nofollow">Google</a>

func (*Policy) SanitizeReader 

func (p *Policy) SanitizeReader(r io.Reader) *bytes.Buffer

SanitizeReader takes an io.Reader that contains a HTML fragment or document and applies the given policy whitelist.

It returns a bytes.Buffer containing the HTML that has been sanitized by the policy. Errors during sanitization will merely return an empty result.

Example 
package main

import (
	"fmt"
	"strings"

	"github.com/cosban/bluemonday"
)

func main() {
	// UGCPolicy is a convenience policy for user generated content.
	p := bluemonday.UGCPolicy()

	// io.Reader in, bytes.Buffer out
	r := strings.NewReader(`<a onblur="alert(secret)" href="http://www.google.com">Google</a>`)
	buf := p.SanitizeReader(r)

	fmt.Println(buf.String())

}

Output:

<a href="http://www.google.com" rel="nofollow">Google</a>

func (*Policy) SkipElementsContent 

func (p *Policy) SkipElementsContent(names ...string) *Policy

SkipElementsContent adds the HTML elements whose tags is needed to be removed with it's content.

func (*Policy) StripBrackets 

func (p *Policy) StripBrackets(b bool)

func (*Policy) ToStripBrackets 

func (p *Policy) ToStripBrackets() bool

Source Files

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