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safelist.rb
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# frozen_string_literal: true
require "set"
module Loofah
module HTML5 # :nodoc:
#
# HTML safelist lifted from HTML5lib sanitizer code:
#
# http://code.google.com/p/html5lib/
#
# <html5_license>
#
# Copyright (c) 2006-2008 The Authors
#
# Contributors:
# James Graham - jg307@cam.ac.uk
# Anne van Kesteren - annevankesteren@gmail.com
# Lachlan Hunt - lachlan.hunt@lachy.id.au
# Matt McDonald - kanashii@kanashii.ca
# Sam Ruby - rubys@intertwingly.net
# Ian Hickson (Google) - ian@hixie.ch
# Thomas Broyer - t.broyer@ltgt.net
# Jacques Distler - distler@golem.ph.utexas.edu
# Henri Sivonen - hsivonen@iki.fi
# The Mozilla Foundation (contributions from Henri Sivonen since 2008)
#
# Permission is hereby granted, free of charge, to any person
# obtaining a copy of this software and associated documentation
# files (the "Software"), to deal in the Software without
# restriction, including without limitation the rights to use, copy,
# modify, merge, publish, distribute, sublicense, and/or sell copies
# of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
# HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
# WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
# DEALINGS IN THE SOFTWARE.
#
# </html5_license>
module SafeList
ACCEPTABLE_ELEMENTS = Set.new([
"a",
"abbr",
"acronym",
"address",
"area",
"article",
"aside",
"audio",
"b",
"bdi",
"bdo",
"big",
"blockquote",
"br",
"button",
"canvas",
"caption",
"center",
"cite",
"code",
"col",
"colgroup",
"command",
"datalist",
"dd",
"del",
"details",
"dfn",
"dir",
"div",
"dl",
"dt",
"em",
"fieldset",
"figcaption",
"figure",
"font",
"footer",
"form",
"h1",
"h2",
"h3",
"h4",
"h5",
"h6",
"header",
"hr",
"i",
"img",
"input",
"ins",
"kbd",
"label",
"legend",
"li",
"main",
"map",
"mark",
"menu",
"meter",
"nav",
"ol",
"optgroup",
"option",
"output",
"p",
"pre",
"q",
"s",
"samp",
"section",
"select",
"small",
"span",
"strike",
"strong",
"sub",
"summary",
"sup",
"table",
"tbody",
"td",
"textarea",
"tfoot",
"th",
"thead",
"time",
"tr",
"tt",
"u",
"ul",
"var",
"video",
"wbr",
])
MATHML_ELEMENTS = Set.new([
"annotation",
"annotation-xml",
"maction",
"math",
"menclose",
"merror",
"mfenced",
"mfrac",
"mi",
"mmultiscripts",
"mn",
"mo",
"mover",
"mpadded",
"mphantom",
"mprescripts",
"mroot",
"mrow",
"ms",
"mspace",
"msqrt",
"mstyle",
"msub",
"msubsup",
"msup",
"mtable",
"mtd",
"mtext",
"mtr",
"munder",
"munderover",
"none",
"semantics",
])
SVG_ELEMENTS = Set.new([
"a",
"altGlyph",
"animate",
"animateColor",
"animateMotion",
"animateTransform",
"circle",
"clipPath",
"cursor",
"defs",
"desc",
"ellipse",
"feGaussianBlur",
"feImage",
"filter",
"font-face",
"font-face-name",
"font-face-src",
"foreignObject",
"g",
"glyph",
"hkern",
"line",
"linearGradient",
"marker",
"mask",
"metadata",
"missing-glyph",
"mpath",
"path",
"pattern",
"polygon",
"polyline",
"radialGradient",
"rect",
"set",
"stop",
"svg",
"switch",
"symbol",
"text",
"textPath",
"title",
"tref",
"tspan",
"use",
])
ACCEPTABLE_ATTRIBUTES = Set.new([
"abbr",
"accept",
"accept-charset",
"accesskey",
"action",
"align",
"alt",
"axis",
"border",
"cellpadding",
"cellspacing",
"char",
"charoff",
"charset",
"checked",
"cite",
"class",
"clear",
"color",
"cols",
"colspan",
"compact",
"contenteditable",
"coords",
"datetime",
"dir",
"disabled",
"enctype",
"for",
"frame",
"headers",
"height",
"href",
"hreflang",
"hspace",
"id",
"ismap",
"label",
"lang",
"longdesc",
"loop",
"loopcount",
"loopend",
"loopstart",
"maxlength",
"media",
"method",
"multiple",
"name",
"nohref",
"noshade",
"nowrap",
"poster",
"preload",
"prompt",
"readonly",
"rel",
"rev",
"rows",
"rowspan",
"rules",
"scope",
"selected",
"shape",
"size",
"span",
"src",
"start",
"style",
"summary",
"tabindex",
"target",
"title",
"type",
"usemap",
"valign",
"value",
"vspace",
"width",
"xml:lang",
])
MATHML_ATTRIBUTES = Set.new([
"actiontype",
"align",
"close",
"columnalign",
"columnlines",
"columnspacing",
"columnspan",
"depth",
"dir",
"display",
"displaystyle",
"encoding",
"equalcolumns",
"equalrows",
"fence",
"fontstyle",
"fontweight",
"frame",
"height",
"href",
"linethickness",
"lquote",
"lspace",
"mathbackground",
"mathcolor",
"mathsize",
"mathvariant",
"maxsize",
"minsize",
"notation",
"open",
"other",
"rowalign",
"rowlines",
"rowspacing",
"rowspan",
"rquote",
"rspace",
"scriptlevel",
"selection",
"separator",
"separators",
"stretchy",
"width",
"xlink:href",
"xlink:show",
"xlink:type",
"xmlns",
"xmlns:xlink",
])
SVG_ATTRIBUTES = Set.new([
"accent-height",
"accumulate",
"additive",
"alphabetic",
"arabic-form",
"ascent",
"attributeName",
"attributeType",
"baseProfile",
"bbox",
"begin",
"calcMode",
"cap-height",
"class",
"clip-path",
"clip-rule",
"color",
"color-interpolation-filters",
"color-profile",
"color-rendering",
"content",
"cursor",
"cx",
"cy",
"d",
"descent",
"display",
"dur",
"dx",
"dy",
"end",
"fill",
"fill-opacity",
"fill-rule",
"filter",
"filterRes",
"filterUnits",
"font-family",
"font-size",
"font-stretch",
"font-style",
"font-variant",
"font-weight",
"fx",
"fy",
"g1",
"g2",
"glyph-name",
"gradientUnits",
"hanging",
"height",
"horiz-adv-x",
"horiz-origin-x",
"id",
"ideographic",
"k",
"keyPoints",
"keySplines",
"keyTimes",
"lang",
"marker",
"marker-end",
"marker-mid",
"marker-start",
"markerHeight",
"markerUnits",
"markerWidth",
"mask",
"maskContentUnits",
"maskUnits",
"mathematical",
"max",
"method",
"min",
"name",
"offset",
"opacity",
"orient",
"origin",
"overline-position",
"overline-thickness",
"panose-1",
"path",
"pathLength",
"patternContentUnits",
"patternTransform",
"patternUnits",
"points",
"preserveAspectRatio",
"primitiveUnits",
"r",
"refX",
"refY",
"repeatCount",
"repeatDur",
"requiredExtensions",
"requiredFeatures",
"restart",
"rotate",
"rx",
"ry",
"slope",
"spacing",
"startOffset",
"stdDeviation",
"stemh",
"stemv",
"stop-color",
"stop-opacity",
"strikethrough-position",
"strikethrough-thickness",
"stroke",
"stroke-dasharray",
"stroke-dashoffset",
"stroke-linecap",
"stroke-linejoin",
"stroke-miterlimit",
"stroke-opacity",
"stroke-width",
"systemLanguage",
"target",
"text-anchor",
"transform",
"type",
"u1",
"u2",
"underline-position",
"underline-thickness",
"unicode",
"unicode-range",
"units-per-em",
"version",
"viewBox",
"visibility",
"width",
"widths",
"x",
"x-height",
"x1",
"x2",
"xlink:actuate",
"xlink:arcrole",
"xlink:href",
"xlink:role",
"xlink:show",
"xlink:title",
"xlink:type",
"xml:base",
"xml:lang",
"xml:space",
"xmlns",
"xmlns:xlink",
"y",
"y1",
"y2",
"zoomAndPan",
])
ARIA_ATTRIBUTES = Set.new([
"aria-activedescendant",
"aria-atomic",
"aria-autocomplete",
"aria-braillelabel",
"aria-brailleroledescription",
"aria-busy",
"aria-checked",
"aria-colcount",
"aria-colindex",
"aria-colindextext",
"aria-colspan",
"aria-controls",
"aria-current",
"aria-describedby",
"aria-description",
"aria-details",
"aria-disabled",
"aria-dropeffect",
"aria-errormessage",
"aria-expanded",
"aria-flowto",
"aria-grabbed",
"aria-haspopup",
"aria-hidden",
"aria-invalid",
"aria-keyshortcuts",
"aria-label",
"aria-labelledby",
"aria-level",
"aria-live",
"aria-multiline",
"aria-multiselectable",
"aria-orientation",
"aria-owns",
"aria-placeholder",
"aria-posinset",
"aria-pressed",
"aria-readonly",
"aria-relevant",
"aria-required",
"aria-roledescription",
"aria-rowcount",
"aria-rowindex",
"aria-rowindextext",
"aria-rowspan",
"aria-selected",
"aria-setsize",
"aria-sort",
"aria-valuemax",
"aria-valuemin",
"aria-valuenow",
"aria-valuetext",
"role",
])
ATTR_VAL_IS_URI = Set.new([
"action",
"cite",
"href",
"longdesc",
"poster",
"preload",
"src",
"xlink:href",
"xml:base",
])
SVG_ATTR_VAL_ALLOWS_REF = Set.new([
"clip-path",
"color-profile",
"cursor",
"fill",
"filter",
"marker",
"marker-end",
"marker-mid",
"marker-start",
"mask",
"stroke",
])
SVG_ALLOW_LOCAL_HREF = Set.new([
"altGlyph",
"animate",
"animateColor",
"animateMotion",
"animateTransform",
"cursor",
"feImage",
"filter",
"linearGradient",
"pattern",
"radialGradient",
"set",
"textpath",
"tref",
"use",
])
ACCEPTABLE_CSS_PROPERTIES = Set.new([
"accent-color",
"align-content",
"align-items",
"align-self",
"aspect-ratio",
"azimuth",
"background-color",
"border-bottom-color",
"border-collapse",
"border-color",
"border-left-color",
"border-right-color",
"border-top-color",
"clear",
"color",
"cursor",
"direction",
"display",
"elevation",
"flex",
"flex-basis",
"flex-direction",
"flex-flow",
"flex-grow",
"flex-shrink",
"flex-wrap",
"float",
"font",
"font-family",
"font-size",
"font-style",
"font-variant",
"font-weight",
"height",
"justify-content",
"letter-spacing",
"line-height",
"list-style",
"list-style-type",
"max-height",
"max-width",
"min-height",
"min-width",
"order",
"overflow",
"overflow-x",
"overflow-y",
"page-break-after",
"page-break-before",
"page-break-inside",
"pause",
"pause-after",
"pause-before",
"pitch",
"pitch-range",
"position",
"richness",
"speak",
"speak-header",
"speak-numeral",
"speak-punctuation",
"speech-rate",
"stress",
"scroll-margin",
"scroll-padding",
"text-align",
"text-decoration",
"text-decoration-color",
"text-decoration-line",
"text-decoration-skip",
"text-decoration-skip-ink",
"text-decoration-style",
"text-decoration-thickness",
"text-emphasis",
"text-emphasis-color",
"text-emphasis-position",
"text-emphasis-style",
"text-indent",
"text-justify",
"text-orientation",
"text-overflow",
"text-rendering",
"text-shadow",
"text-size-adjust",
"text-transform",
"text-underline-offset",
"text-underline-position",
"unicode-bidi",
"vertical-align",
"voice-family",
"volume",
"white-space",
"width",
"z-index",
])
ACCEPTABLE_CSS_KEYWORDS = Set.new([
"!important",
"auto",
"block",
"bold",
"both",
"bottom",
"center",
"collapse",
"dashed",
"dotted",
"double",
"groove",
"hidden",
"inherit",
"initial",
"inset",
"italic",
"left",
"medium",
"no-repeat",
"none",
"normal",
"nowrap",
"outset",
"pointer",
"repeat",
"repeat-x",
"repeat-y",
"revert",
"ridge",
"right",
"round",
"separate",
"solid",
"space",
"thick",
"thin",
"top",
"transparent",
"underline",
"unset",
])
# https://www.w3.org/TR/css-color-3/#html4
ACCEPTABLE_CSS_COLORS = Set.new([
"aqua",
"black",
"blue",
"fuchsia",
"gray",
"green",
"lime",
"maroon",
"navy",
"olive",
"purple",
"red",
"silver",
"teal",
"white",
"yellow",
])
# https://www.w3.org/TR/css-color-3/#svg-color
ACCEPTABLE_CSS_EXTENDED_COLORS = Set.new([
"aliceblue",
"antiquewhite",
"aqua",
"aquamarine",
"azure",
"beige",
"bisque",
"black",
"blanchedalmond",
"blue",
"blueviolet",
"brown",
"burlywood",
"cadetblue",
"chartreuse",
"chocolate",
"coral",
"cornflowerblue",
"cornsilk",
"crimson",
"cyan",
"darkblue",
"darkcyan",
"darkgoldenrod",
"darkgray",
"darkgreen",
"darkgrey",
"darkkhaki",
"darkmagenta",
"darkolivegreen",
"darkorange",
"darkorchid",
"darkred",
"darksalmon",
"darkseagreen",
"darkslateblue",
"darkslategray",
"darkslategrey",
"darkturquoise",
"darkviolet",
"deeppink",
"deepskyblue",
"dimgray",
"dimgrey",
"dodgerblue",
"firebrick",
"floralwhite",
"forestgreen",
"fuchsia",
"gainsboro",
"ghostwhite",
"gold",
"goldenrod",
"gray",
"green",
"greenyellow",
"grey",
"honeydew",
"hotpink",
"indianred",
"indigo",
"ivory",
"khaki",
"lavender",
"lavenderblush",
"lawngreen",
"lemonchiffon",
"lightblue",
"lightcoral",
"lightcyan",
"lightgoldenrodyellow",
"lightgray",
"lightgreen",
"lightgrey",
"lightpink",
"lightsalmon",
"lightseagreen",
"lightskyblue",
"lightslategray",
"lightslategrey",
"lightsteelblue",
"lightyellow",
"lime",
"limegreen",
"linen",
"magenta",
"maroon",
"mediumaquamarine",
"mediumblue",
"mediumorchid",
"mediumpurple",
"mediumseagreen",
"mediumslateblue",
"mediumspringgreen",
"mediumturquoise",
"mediumvioletred",
"midnightblue",
"mintcream",
"mistyrose",
"moccasin",
"navajowhite",
"navy",
"oldlace",
"olive",
"olivedrab",
"orange",
"orangered",
"orchid",
"palegoldenrod",
"palegreen",
"paleturquoise",
"palevioletred",
"papayawhip",
"peachpuff",
"peru",
"pink",
"plum",
"powderblue",
"purple",
"red",
"rosybrown",
"royalblue",
"saddlebrown",
"salmon",
"sandybrown",
"seagreen",
"seashell",
"sienna",
"silver",
"skyblue",
"slateblue",
"slategray",
"slategrey",
"snow",
"springgreen",
"steelblue",
"tan",
"teal",
"thistle",
"tomato",
"turquoise",
"violet",
"wheat",
"white",
"whitesmoke",
"yellow",
"yellowgreen",
])
# see https://www.quackit.com/css/functions/
# omit `url` and `image` from that list
ACCEPTABLE_CSS_FUNCTIONS = Set.new([
"attr",
"blur",
"brightness",
"calc",
"circle",
"contrast",
"counter",
"counters",
"cubic-bezier",
"drop-shadow",
"ellipse",
"grayscale",
"hsl",
"hsla",
"hue-rotate",
"hwb",
"inset",
"invert",
"linear-gradient",
"matrix",
"matrix3d",
"opacity",
"perspective",
"polygon",
"radial-gradient",
"repeating-linear-gradient",
"repeating-radial-gradient",
"rgb",
"rgba",
"rotate",
"rotate3d",
"rotateX",
"rotateY",
"rotateZ",
"saturate",
"sepia",
"scale",
"scale3d",
"scaleX",
"scaleY",
"scaleZ",
"skew",
"skewX",
"skewY",
"symbols",
"translate",
"translate3d",
"translateX",
"translateY",
"translateZ",
])
SHORTHAND_CSS_PROPERTIES = Set.new([
"background",
"border",
"margin",
"padding",
])
ACCEPTABLE_SVG_PROPERTIES = Set.new([
"fill",