/usr/share/gocode/src/github.com/microcosm-cc/bluemonday/policies.go is in golang-github-microcosm-cc-bluemonday-dev 0.0~git20161202.0.e797637-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 | // Copyright (c) 2014, David Kitchen <david@buro9.com>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are met:
//
// * Redistributions of source code must retain the above copyright notice, this
// list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of the organisation (Microcosm) nor the names of its
// contributors may be used to endorse or promote products derived from
// this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
// DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
// FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
// DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
// SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
// OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
package bluemonday
import (
"regexp"
)
// StrictPolicy returns an empty policy, which will effectively strip all HTML
// elements and their attributes from a document.
func StrictPolicy() *Policy {
return NewPolicy()
}
// StripTagsPolicy is DEPRECATED. Use StrictPolicy instead.
func StripTagsPolicy() *Policy {
return StrictPolicy()
}
// 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.
func UGCPolicy() *Policy {
p := 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(Paragraph).OnElements("area")
p.AllowAttrs("coords").Matching(
regexp.MustCompile(`^([0-9]+,)+[0-9]+$`),
).OnElements("area")
p.AllowAttrs("href").OnElements("area")
p.AllowAttrs("rel").Matching(SpaceSeparatedTokens).OnElements("area")
p.AllowAttrs("shape").Matching(
regexp.MustCompile(`(?i)^(default|circle|rect|poly)$`),
).OnElements("area")
p.AllowAttrs("usemap").Matching(
regexp.MustCompile(`(?i)^#[\p{L}\p{N}_-]+$`),
).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(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(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(Paragraph).OnElements("del", "ins")
p.AllowAttrs("datetime").Matching(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(Number).OnElements("meter")
// "progress" is permitted
p.AllowAttrs("value", "max").Matching(Number).OnElements("progress")
//////////////////////
// Embedded content //
//////////////////////
// Vast majority not permitted
// "audio" "canvas" "embed" "iframe" "object" "param" "source" "svg" "track"
// "video" are all not permitted
p.AllowImages()
return p
}
|