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549 lines
18 KiB
Go
549 lines
18 KiB
Go
// Copyright (c) 2014, David Kitchen <david@buro9.com>
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are met:
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//
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// * Redistributions of source code must retain the above copyright notice, this
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// list of conditions and the following disclaimer.
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//
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// * Redistributions in binary form must reproduce the above copyright notice,
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// this list of conditions and the following disclaimer in the documentation
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// and/or other materials provided with the distribution.
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//
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// * Neither the name of the organisation (Microcosm) nor the names of its
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// contributors may be used to endorse or promote products derived from
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// this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
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// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
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// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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package bluemonday
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import (
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"net/url"
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"regexp"
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"strings"
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)
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// Policy encapsulates the whitelist of HTML elements and attributes that will
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// be applied to the sanitised HTML.
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//
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// You should use bluemonday.NewPolicy() to create a blank policy as the
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// unexported fields contain maps that need to be initialized.
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type Policy struct {
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// Declares whether the maps have been initialized, used as a cheap check to
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// ensure that those using Policy{} directly won't cause nil pointer
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// exceptions
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initialized bool
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// Allows the <!DOCTYPE > tag to exist in the sanitized document
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allowDocType bool
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// If true then we add spaces when stripping tags, specifically the closing
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// tag is replaced by a space character.
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addSpaces bool
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// When true, add rel="nofollow" to HTML anchors
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requireNoFollow bool
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// When true, add rel="nofollow" to HTML anchors
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// Will add for href="http://foo"
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// Will skip for href="/foo" or href="foo"
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requireNoFollowFullyQualifiedLinks bool
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// When true add target="_blank" to fully qualified links
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// Will add for href="http://foo"
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// Will skip for href="/foo" or href="foo"
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addTargetBlankToFullyQualifiedLinks bool
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// When true, URLs must be parseable by "net/url" url.Parse()
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requireParseableURLs bool
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// When true, u, _ := url.Parse("url"); !u.IsAbs() is permitted
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allowRelativeURLs bool
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// map[htmlElementName]map[htmlAttributeName]attrPolicy
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elsAndAttrs map[string]map[string]attrPolicy
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// map[htmlAttributeName]attrPolicy
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globalAttrs map[string]attrPolicy
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// If urlPolicy is nil, all URLs with matching schema are allowed.
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// Otherwise, only the URLs with matching schema and urlPolicy(url)
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// returning true are allowed.
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allowURLSchemes map[string]urlPolicy
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// If an element has had all attributes removed as a result of a policy
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// being applied, then the element would be removed from the output.
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//
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// However some elements are valid and have strong layout meaning without
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// any attributes, i.e. <table>. To prevent those being removed we maintain
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// a list of elements that are allowed to have no attributes and that will
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// be maintained in the output HTML.
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setOfElementsAllowedWithoutAttrs map[string]struct{}
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setOfElementsToSkipContent map[string]struct{}
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}
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type attrPolicy struct {
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// optional pattern to match, when not nil the regexp needs to match
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// otherwise the attribute is removed
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regexp *regexp.Regexp
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}
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type attrPolicyBuilder struct {
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p *Policy
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attrNames []string
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regexp *regexp.Regexp
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allowEmpty bool
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}
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type urlPolicy func(url *url.URL) (allowUrl bool)
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// init initializes the maps if this has not been done already
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func (p *Policy) init() {
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if !p.initialized {
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p.elsAndAttrs = make(map[string]map[string]attrPolicy)
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p.globalAttrs = make(map[string]attrPolicy)
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p.allowURLSchemes = make(map[string]urlPolicy)
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p.setOfElementsAllowedWithoutAttrs = make(map[string]struct{})
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p.setOfElementsToSkipContent = make(map[string]struct{})
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p.initialized = true
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}
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}
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// NewPolicy returns a blank policy with nothing whitelisted or permitted. This
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// is the recommended way to start building a policy and you should now use
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// AllowAttrs() and/or AllowElements() to construct the whitelist of HTML
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// elements and attributes.
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func NewPolicy() *Policy {
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p := Policy{}
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p.addDefaultElementsWithoutAttrs()
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p.addDefaultSkipElementContent()
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return &p
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}
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// AllowAttrs takes a range of HTML attribute names and returns an
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// attribute policy builder that allows you to specify the pattern and scope of
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// the whitelisted attribute.
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//
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// The attribute policy is only added to the core policy when either Globally()
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// or OnElements(...) are called.
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func (p *Policy) AllowAttrs(attrNames ...string) *attrPolicyBuilder {
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p.init()
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abp := attrPolicyBuilder{
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p: p,
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allowEmpty: false,
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}
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for _, attrName := range attrNames {
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abp.attrNames = append(abp.attrNames, strings.ToLower(attrName))
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}
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return &abp
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}
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// AllowNoAttrs says that attributes on element are optional.
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//
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// The attribute policy is only added to the core policy when OnElements(...)
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// are called.
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func (p *Policy) AllowNoAttrs() *attrPolicyBuilder {
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p.init()
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abp := attrPolicyBuilder{
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p: p,
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allowEmpty: true,
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}
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return &abp
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}
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// AllowNoAttrs says that attributes on element are optional.
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//
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// The attribute policy is only added to the core policy when OnElements(...)
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// are called.
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func (abp *attrPolicyBuilder) AllowNoAttrs() *attrPolicyBuilder {
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abp.allowEmpty = true
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return abp
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}
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// Matching allows a regular expression to be applied to a nascent attribute
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// policy, and returns the attribute policy. Calling this more than once will
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// replace the existing regexp.
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func (abp *attrPolicyBuilder) Matching(regex *regexp.Regexp) *attrPolicyBuilder {
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abp.regexp = regex
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return abp
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}
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// OnElements will bind an attribute policy to a given range of HTML elements
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// and return the updated policy
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func (abp *attrPolicyBuilder) OnElements(elements ...string) *Policy {
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for _, element := range elements {
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element = strings.ToLower(element)
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for _, attr := range abp.attrNames {
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if _, ok := abp.p.elsAndAttrs[element]; !ok {
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abp.p.elsAndAttrs[element] = make(map[string]attrPolicy)
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}
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ap := attrPolicy{}
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if abp.regexp != nil {
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ap.regexp = abp.regexp
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}
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abp.p.elsAndAttrs[element][attr] = ap
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}
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if abp.allowEmpty {
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abp.p.setOfElementsAllowedWithoutAttrs[element] = struct{}{}
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if _, ok := abp.p.elsAndAttrs[element]; !ok {
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abp.p.elsAndAttrs[element] = make(map[string]attrPolicy)
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}
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}
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}
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return abp.p
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}
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// Globally will bind an attribute policy to all HTML elements and return the
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// updated policy
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func (abp *attrPolicyBuilder) Globally() *Policy {
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for _, attr := range abp.attrNames {
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if _, ok := abp.p.globalAttrs[attr]; !ok {
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abp.p.globalAttrs[attr] = attrPolicy{}
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}
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ap := attrPolicy{}
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if abp.regexp != nil {
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ap.regexp = abp.regexp
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}
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abp.p.globalAttrs[attr] = ap
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}
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return abp.p
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}
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// AllowElements will append HTML elements to the whitelist without applying an
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// attribute policy to those elements (the elements are permitted
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// sans-attributes)
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func (p *Policy) AllowElements(names ...string) *Policy {
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p.init()
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for _, element := range names {
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element = strings.ToLower(element)
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if _, ok := p.elsAndAttrs[element]; !ok {
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p.elsAndAttrs[element] = make(map[string]attrPolicy)
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}
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}
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return p
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}
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// RequireNoFollowOnLinks will result in all <a> tags having a rel="nofollow"
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// added to them if one does not already exist
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//
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// Note: This requires p.RequireParseableURLs(true) and will enable it.
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func (p *Policy) RequireNoFollowOnLinks(require bool) *Policy {
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p.requireNoFollow = require
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p.requireParseableURLs = true
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return p
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}
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// RequireNoFollowOnFullyQualifiedLinks will result in all <a> tags that point
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// to a non-local destination (i.e. starts with a protocol and has a host)
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// having a rel="nofollow" added to them if one does not already exist
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//
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// Note: This requires p.RequireParseableURLs(true) and will enable it.
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func (p *Policy) RequireNoFollowOnFullyQualifiedLinks(require bool) *Policy {
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p.requireNoFollowFullyQualifiedLinks = require
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p.requireParseableURLs = true
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return p
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}
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// AddTargetBlankToFullyQualifiedLinks will result in all <a> tags that point
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// to a non-local destination (i.e. starts with a protocol and has a host)
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// having a target="_blank" added to them if one does not already exist
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//
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// Note: This requires p.RequireParseableURLs(true) and will enable it.
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func (p *Policy) AddTargetBlankToFullyQualifiedLinks(require bool) *Policy {
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p.addTargetBlankToFullyQualifiedLinks = require
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p.requireParseableURLs = true
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return p
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}
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// RequireParseableURLs will result in all URLs requiring that they be parseable
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// by "net/url" url.Parse()
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// This applies to:
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// - a.href
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// - area.href
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// - blockquote.cite
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// - img.src
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// - link.href
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// - script.src
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func (p *Policy) RequireParseableURLs(require bool) *Policy {
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p.requireParseableURLs = require
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return p
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}
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// AllowRelativeURLs enables RequireParseableURLs and then permits URLs that
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// are parseable, have no schema information and url.IsAbs() returns false
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// This permits local URLs
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func (p *Policy) AllowRelativeURLs(require bool) *Policy {
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p.RequireParseableURLs(true)
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p.allowRelativeURLs = require
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return p
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}
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// AllowURLSchemes will append URL schemes to the whitelist
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// Example: p.AllowURLSchemes("mailto", "http", "https")
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func (p *Policy) AllowURLSchemes(schemes ...string) *Policy {
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p.init()
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p.RequireParseableURLs(true)
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for _, scheme := range schemes {
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scheme = strings.ToLower(scheme)
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// Allow all URLs with matching scheme.
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p.allowURLSchemes[scheme] = nil
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}
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return p
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}
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// AllowURLSchemeWithCustomPolicy will append URL schemes with
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// a custom URL policy to the whitelist.
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// Only the URLs with matching schema and urlPolicy(url)
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// returning true will be allowed.
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func (p *Policy) AllowURLSchemeWithCustomPolicy(
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scheme string,
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urlPolicy func(url *url.URL) (allowUrl bool),
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) *Policy {
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p.init()
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p.RequireParseableURLs(true)
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scheme = strings.ToLower(scheme)
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p.allowURLSchemes[scheme] = urlPolicy
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return p
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}
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// AllowDocType states whether the HTML sanitised by the sanitizer is allowed to
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// contain the HTML DocType tag: <!DOCTYPE HTML> or one of it's variants.
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//
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// The HTML spec only permits one doctype per document, and as you know how you
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// are using the output of this, you know best as to whether we should ignore it
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// (default) or not.
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//
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// If you are sanitizing a HTML fragment the default (false) is fine.
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func (p *Policy) AllowDocType(allow bool) *Policy {
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p.allowDocType = allow
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return p
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}
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// AddSpaceWhenStrippingTag states whether to add a single space " " when
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// removing tags that are not whitelisted by the policy.
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//
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// This is useful if you expect to strip tags in dense markup and may lose the
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// value of whitespace.
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//
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// For example: "<p>Hello</p><p>World</p>"" would be sanitized to "HelloWorld"
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// with the default value of false, but you may wish to sanitize this to
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// " Hello World " by setting AddSpaceWhenStrippingTag to true as this would
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// retain the intent of the text.
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func (p *Policy) AddSpaceWhenStrippingTag(allow bool) *Policy {
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p.addSpaces = allow
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return p
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}
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// SkipElementsContent adds the HTML elements whose tags is needed to be removed
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// with it's content.
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func (p *Policy) SkipElementsContent(names ...string) *Policy {
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p.init()
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for _, element := range names {
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element = strings.ToLower(element)
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if _, ok := p.setOfElementsToSkipContent[element]; !ok {
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p.setOfElementsToSkipContent[element] = struct{}{}
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}
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}
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return p
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}
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// AllowElementsContent marks the HTML elements whose content should be
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// retained after removing the tag.
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func (p *Policy) AllowElementsContent(names ...string) *Policy {
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p.init()
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for _, element := range names {
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delete(p.setOfElementsToSkipContent, strings.ToLower(element))
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}
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return p
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}
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// addDefaultElementsWithoutAttrs adds the HTML elements that we know are valid
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// without any attributes to an internal map.
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// i.e. we know that <table> is valid, but <bdo> isn't valid as the "dir" attr
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// is mandatory
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func (p *Policy) addDefaultElementsWithoutAttrs() {
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p.init()
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p.setOfElementsAllowedWithoutAttrs["abbr"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["acronym"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["article"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["aside"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["audio"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["b"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["bdi"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["blockquote"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["body"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["br"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["button"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["canvas"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["caption"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["cite"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["code"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["col"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["colgroup"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["datalist"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["dd"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["del"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["details"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["dfn"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["div"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["dl"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["dt"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["em"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["fieldset"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["figcaption"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["figure"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["footer"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["h1"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["h2"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["h3"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["h4"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["h5"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["h6"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["head"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["header"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["hgroup"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["hr"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["html"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["i"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["ins"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["kbd"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["li"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["mark"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["nav"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["ol"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["optgroup"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["option"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["p"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["pre"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["q"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["rp"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["rt"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["ruby"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["s"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["samp"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["section"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["select"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["small"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["span"] = struct{}{}
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p.setOfElementsAllowedWithoutAttrs["strike"] = struct{}{}
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|
p.setOfElementsAllowedWithoutAttrs["strong"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["style"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["sub"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["summary"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["sup"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["svg"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["table"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["tbody"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["td"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["textarea"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["tfoot"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["th"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["thead"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["title"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["time"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["tr"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["tt"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["u"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["ul"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["var"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["video"] = struct{}{}
|
|
p.setOfElementsAllowedWithoutAttrs["wbr"] = struct{}{}
|
|
|
|
}
|
|
|
|
// addDefaultSkipElementContent adds the HTML elements that we should skip
|
|
// rendering the character content of, if the element itself is not allowed.
|
|
// This is all character data that the end user would not normally see.
|
|
// i.e. if we exclude a <script> tag then we shouldn't render the JavaScript or
|
|
// anything else until we encounter the closing </script> tag.
|
|
func (p *Policy) addDefaultSkipElementContent() {
|
|
p.init()
|
|
|
|
p.setOfElementsToSkipContent["frame"] = struct{}{}
|
|
p.setOfElementsToSkipContent["frameset"] = struct{}{}
|
|
p.setOfElementsToSkipContent["iframe"] = struct{}{}
|
|
p.setOfElementsToSkipContent["noembed"] = struct{}{}
|
|
p.setOfElementsToSkipContent["noframes"] = struct{}{}
|
|
p.setOfElementsToSkipContent["noscript"] = struct{}{}
|
|
p.setOfElementsToSkipContent["nostyle"] = struct{}{}
|
|
p.setOfElementsToSkipContent["object"] = struct{}{}
|
|
p.setOfElementsToSkipContent["script"] = struct{}{}
|
|
p.setOfElementsToSkipContent["style"] = struct{}{}
|
|
p.setOfElementsToSkipContent["title"] = struct{}{}
|
|
}
|