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sanitizer.ts
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sanitizer.ts
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/* eslint-disable camelcase */
// Copyright (c) Jupyter Development Team.
// Distributed under the terms of the Modified BSD License.
import sanitize from 'sanitize-html';
import { IRenderMime } from '@jupyterlab/rendermime-interfaces';
/**
* Helper class that contains regular expressions for inline CSS style validation.
*
* Which properties (and values) to allow is largely based on the Google Caja project:
* https://github.com/google/caja
*
* The regular expressions are largly based on the syntax definition found at
* https://developer.mozilla.org/en-US/docs/Web/CSS.
*/
class CssProp {
static reg(r: string): RegExp {
return new RegExp('^' + r + '$', 'i');
}
/*
* Numeric base expressions used to help build more complex regular expressions
*/
private static readonly N = {
integer: `[+-]?[0-9]+`,
integer_pos: `[+]?[0-9]+`,
integer_zero_ff: `([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])`,
number: `[+-]?([0-9]*[.])?[0-9]+(e-?[0-9]*)?`,
number_pos: `[+]?([0-9]*[.])?[0-9]+(e-?[0-9]*)?`,
number_zero_hundred: `[+]?(([0-9]|[1-9][0-9])([.][0-9]+)?|100)`,
number_zero_one: `[+]?(1([.][0]+)?|0?([.][0-9]+)?)`
};
/*
* Base expressions of common CSS syntax elements
*/
private static readonly B = {
angle: `(${CssProp.N.number}(deg|rad|grad|turn)|0)`,
frequency: `${CssProp.N.number}(Hz|kHz)`,
ident: String.raw`-?([_a-z]|[\xA0-\xFF]|\\[0-9a-f]{1,6}(\r\n|[ \t\r\n\f])?|\\[^\r\n\f0-9a-f])([_a-z0-9-]|[\xA0-\xFF]|\\[0-9a-f]{1,6}(\r\n|[ \t\r\n\f])?|\\[^\r\n\f0-9a-f])*`,
len_or_perc: `(0|${CssProp.N.number}(px|em|rem|ex|in|cm|mm|pt|pc|%))`,
length: `(${CssProp.N.number}(px|em|rem|ex|in|cm|mm|pt|pc)|0)`,
length_pos: `(${CssProp.N.number_pos}(px|em|rem|ex|in|cm|mm|pt|pc)|0)`,
percentage: `${CssProp.N.number}%`,
percentage_pos: `${CssProp.N.number_pos}%`,
percentage_zero_hundred: `${CssProp.N.number_zero_hundred}%`,
string: String.raw`(\"([^\n\r\f\\"]|\\\n|\r\n|\r|\f|\\[0-9a-f]{1,6}(\r\n|[ \t\r\n\f])?|\\[^\r\n\f0-9a-f])*\")|(\'([^\n\r\f\\']|\\\n|\r\n|\r|\f|\\[0-9a-f]{1,6}(\r\n|[ \t\r\n\f])?|\\[^\r\n\f0-9a-f])*\')`,
time: `${CssProp.N.number}(s|ms)`,
url: `url\\(.*?\\)`,
z_index: `[+-]?[0-9]{1,7}`
};
/*
* Atomic (i.e. not dependant on other regular expressions) sub RegEx segments
*/
private static readonly A = {
absolute_size: `xx-small|x-small|small|medium|large|x-large|xx-large`,
attachment: `scroll|fixed|local`,
bg_origin: `border-box|padding-box|content-box`,
border_style: `none|hidden|dotted|dashed|solid|double|groove|ridge|inset|outset`,
box: `border-box|padding-box|content-box`,
display_inside: `auto|block|table|flex|grid`,
display_outside: `block-level|inline-level|none|table-row-group|table-header-group|table-footer-group|table-row|table-cell|table-column-group|table-column|table-caption`,
ending_shape: `circle|ellipse`,
generic_family: `serif|sans-serif|cursive|fantasy|monospace`,
generic_voice: `male|female|child`,
relative_size: `smaller|larger`,
repeat_style: `repeat-x|repeat-y|((?:repeat|space|round|no-repeat)(?:\\s*(?:repeat|space|round|no-repeat))?)`,
side_or_corner: `(left|right)?\\s*(top|bottom)?`,
single_animation_direction: `normal|reverse|alternate|alternate-reverse`,
single_animation_fill_mode: `none|forwards|backwards|both`,
single_animation_play_state: `running|paused`
};
/*
* Color definition sub expressions
*/
private static readonly _COLOR = {
hex: `\\#(0x)?[0-9a-f]+`,
name: `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|darkkhaki|darkmagenta|darkolivegreen|darkorange|darkorchid|darkred|darksalmon|darkseagreen|darkslateblue|darkslategray|darkturquoise|darkviolet|deeppink|deepskyblue|dimgray|dodgerblue|firebrick|floralwhite|forestgreen|fuchsia|gainsboro|ghostwhite|gold|goldenrod|gray|green|greenyellow|honeydew|hotpink|indianred|indigo|ivory|khaki|lavender|lavenderblush|lawngreen|lemonchiffon|lightblue|lightcoral|lightcyan|lightgoldenrodyellow|lightgreen|lightgrey|lightpink|lightsalmon|lightseagreen|lightskyblue|lightslategray|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|snow|springgreen|steelblue|tan|teal|thistle|tomato|turquoise|transparent|violet|wheat|white|whitesmoke|yellow|yellowgreen`,
rgb: String.raw`rgb\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*\)`,
rgba: String.raw`rgba\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(\d{1,3})\s*,\s*(${CssProp.N.integer_zero_ff}|${CssProp.N.number_zero_one}|${CssProp.B.percentage_zero_hundred})\s*\)`
};
/*
* Compound (i.e. dependant on other (sub) regular expressions) sub RegEx segments
*/
private static readonly _C = {
alpha: `${CssProp.N.integer_zero_ff}|${CssProp.N.number_zero_one}|${CssProp.B.percentage_zero_hundred}`,
alphavalue: CssProp.N.number_zero_one,
bg_position: `((${CssProp.B.len_or_perc}|left|center|right|top|bottom)\\s*){1,4}`,
bg_size: `(${CssProp.B.length_pos}|${CssProp.B.percentage}|auto){1,2}|cover|contain`,
border_width: `thin|medium|thick|${CssProp.B.length}`,
bottom: `${CssProp.B.length}|auto`,
color: `${CssProp._COLOR.hex}|${CssProp._COLOR.rgb}|${CssProp._COLOR.rgba}|${CssProp._COLOR.name}`,
color_stop_length: `(${CssProp.B.len_or_perc}\\s*){1,2}`,
linear_color_hint: `${CssProp.B.len_or_perc}`,
family_name: `${CssProp.B.string}|(${CssProp.B.ident}\\s*)+`,
image_decl: CssProp.B.url,
left: `${CssProp.B.length}|auto`,
loose_quotable_words: `(${CssProp.B.ident})+`,
margin_width: `${CssProp.B.len_or_perc}|auto`,
padding_width: `${CssProp.B.length_pos}|${CssProp.B.percentage_pos}`,
page_url: CssProp.B.url,
position: `((${CssProp.B.len_or_perc}|left|center|right|top|bottom)\\s*){1,4}`,
right: `${CssProp.B.length}|auto`,
shadow: '',
size: `closest-side|farthest-side|closest-corner|farthest-corner|${CssProp.B.length}|(${CssProp.B.len_or_perc})\\s+(${CssProp.B.len_or_perc})`,
top: `${CssProp.B.length}|auto`
};
private static readonly _C1 = {
image_list: `image\\(\\s*(${CssProp.B.url})*\\s*(${CssProp.B.url}|${CssProp._C.color})\\s*\\)`,
linear_color_stop: `(${CssProp._C.color})(\\s*${CssProp._C.color_stop_length})?`,
shadow: `((${CssProp._C.color})\\s+((${CssProp.B.length})\\s*){2,4}(\s+inset)?)|((inset\\s+)?((${CssProp.B.length})\\s*){2,4}\\s*(${CssProp._C.color})?)`
};
private static readonly _C2 = {
color_stop_list: `((${CssProp._C1.linear_color_stop})(\\s*(${CssProp._C.linear_color_hint}))?\\s*,\\s*)+(${CssProp._C1.linear_color_stop})`,
shape: `rect\\(\\s*(${CssProp._C.top})\\s*,\\s*(${CssProp._C.right})\\s*,\\s*(${CssProp._C.bottom})\\s*,\\s*(${CssProp._C.left})\\s*\\)`
};
private static readonly _C3 = {
linear_gradient: `linear-gradient\\((((${CssProp.B.angle})|to\\s+(${CssProp.A.side_or_corner}))\\s*,\\s*)?\\s*(${CssProp._C2.color_stop_list})\\s*\\)`,
radial_gradient: `radial-gradient\\(((((${CssProp.A.ending_shape})|(${CssProp._C.size}))\\s*)*\\s*(at\\s+${CssProp._C.position})?\\s*,\\s*)?\\s*(${CssProp._C2.color_stop_list})\\s*\\)`
};
private static readonly _C4 = {
image: `${CssProp.B.url}|${CssProp._C3.linear_gradient}|${CssProp._C3.radial_gradient}|${CssProp._C1.image_list}`,
bg_image: `(${CssProp.B.url}|${CssProp._C3.linear_gradient}|${CssProp._C3.radial_gradient}|${CssProp._C1.image_list})|none`
};
private static readonly C = {
...CssProp._C,
...CssProp._C1,
...CssProp._C2,
...CssProp._C3,
...CssProp._C4
};
/*
* Property value regular expressions not dependant on other sub expressions
*/
private static readonly AP = {
border_collapse: `collapse|separate`,
box: `normal|none|contents`,
box_sizing: `content-box|padding-box|border-box`,
caption_side: `top|bottom`,
clear: `none|left|right|both`,
direction: `ltr|rtl`,
empty_cells: `show|hide`,
float: `left|right|none`,
font_stretch: `normal|wider|narrower|ultra-condensed|extra-condensed|condensed|semi-condensed|semi-expanded|expanded|extra-expanded|ultra-expanded`,
font_style: `normal|italic|oblique`,
font_variant: `normal|small-caps`,
font_weight: `normal|bold|bolder|lighter|100|200|300|400|500|600|700|800|900`,
list_style_position: `inside|outside`,
list_style_type: `disc|circle|square|decimal|decimal-leading-zero|lower-roman|upper-roman|lower-greek|lower-latin|upper-latin|armenian|georgian|lower-alpha|upper-alpha|none`,
overflow: `visible|hidden|scroll|auto`,
overflow_wrap: `normal|break-word`,
overflow_x: `visible|hidden|scroll|auto|no-display|no-content`,
page_break_after: `auto|always|avoid|left|right`,
page_break_before: `auto|always|avoid|left|right`,
page_break_inside: `avoid|auto`,
position: `static|relative|absolute`,
resize: `none|both|horizontal|vertical`,
speak: `normal|none|spell-out`,
speak_header: `once|always`,
speak_numeral: `digits|continuous`,
speak_punctuation: `code|none`,
table_layout: `auto|fixed`,
text_align: `left|right|center|justify`,
text_decoration: `none|((underline|overline|line-through|blink)\\s*)+`,
text_transform: `capitalize|uppercase|lowercase|none`,
text_wrap: `normal|unrestricted|none|suppress`,
unicode_bidi: `normal|embed|bidi-override`,
visibility: `visible|hidden|collapse`,
white_space: `normal|pre|nowrap|pre-wrap|pre-line`,
word_break: `normal|keep-all|break-all`
};
/*
* Compound propertiy value regular expressions (i.e. dependant on other sub expressions)
*/
private static readonly _CP = {
background_attachment: `${CssProp.A.attachment}(,\\s*${CssProp.A.attachment})*`,
background_color: CssProp.C.color,
background_origin: `${CssProp.A.box}(,\\s*${CssProp.A.box})*`,
background_repeat: `${CssProp.A.repeat_style}(,\\s*${CssProp.A.repeat_style})*`,
border: `((${CssProp.C.border_width}|${CssProp.A.border_style}|${CssProp.C.color})\\s*){1,3}`,
border_radius: `((${CssProp.B.len_or_perc})\\s*){1,4}(\\/\\s*((${CssProp.B.len_or_perc})\\s*){1,4})?`,
border_spacing: `${CssProp.B.length}\\s*(${CssProp.B.length})?`,
border_top_color: CssProp.C.color,
border_top_style: CssProp.A.border_style,
border_width: `((${CssProp.C.border_width})\\s*){1,4}`,
color: CssProp.C.color,
cursor: `(${CssProp.B.url}(\\s*,\\s*)?)*(auto|crosshair|default|pointer|move|e-resize|ne-resize|nw-resize|n-resize|se-resize|sw-resize|s-resize|w-resize|text|wait|help|progress|all-scroll|col-resize|hand|no-drop|not-allowed|row-resize|vertical-text)`,
display: `inline|block|list-item|run-in|inline-list-item|inline-block|table|inline-table|table-cell|table-caption|flex|inline-flex|grid|inline-grid|${CssProp.A.display_inside}|${CssProp.A.display_outside}|inherit|inline-box|inline-stack`,
display_outside: CssProp.A.display_outside,
elevation: `${CssProp.B.angle}|below|level|above|higher|lower`,
font_family: `(${CssProp.C.family_name}|${CssProp.A.generic_family})(,\\s*(${CssProp.C.family_name}|${CssProp.A.generic_family}))*`,
height: `${CssProp.B.length}|${CssProp.B.percentage}|auto`,
letter_spacing: `normal|${CssProp.B.length}`,
list_style_image: `${CssProp.C.image}|none`,
margin_right: CssProp.C.margin_width,
max_height: `${CssProp.B.length_pos}|${CssProp.B.percentage_pos}|none|auto`,
min_height: `${CssProp.B.length_pos}|${CssProp.B.percentage_pos}|auto`,
opacity: CssProp.C.alphavalue,
outline_color: `${CssProp.C.color}|invert`,
outline_width: CssProp.C.border_width,
padding: `((${CssProp.C.padding_width})\\s*){1,4}`,
padding_top: CssProp.C.padding_width,
pitch_range: CssProp.N.number,
right: `${CssProp.B.length}|${CssProp.B.percentage}|auto`,
stress: CssProp.N.number,
text_indent: `${CssProp.B.length}|${CssProp.B.percentage}`,
text_shadow: `none|${CssProp.C.shadow}(,\\s*(${CssProp.C.shadow}))*`,
volume: `${CssProp.N.number_pos}|${CssProp.B.percentage_pos}|silent|x-soft|soft|medium|loud|x-loud`,
word_wrap: CssProp.AP.overflow_wrap,
zoom: `normal|${CssProp.N.number_pos}|${CssProp.B.percentage_pos}`,
backface_visibility: CssProp.AP.visibility,
background_clip: `${CssProp.A.box}(,\\s*(${CssProp.A.box}))*`,
background_position: `${CssProp.C.bg_position}(,\\s*(${CssProp.C.bg_position}))*`,
border_bottom_color: CssProp.C.color,
border_bottom_style: CssProp.A.border_style,
border_color: `((${CssProp.C.color})\\s*){1,4}`,
border_left_color: CssProp.C.color,
border_right_color: CssProp.C.color,
border_style: `((${CssProp.A.border_style})\\s*){1,4}`,
border_top_left_radius: `(${CssProp.B.length}|${CssProp.B.percentage})(\\s*(${CssProp.B.length}|${CssProp.B.percentage}))?`,
border_top_width: CssProp.C.border_width,
box_shadow: `none|${CssProp.C.shadow}(,\\s*(${CssProp.C.shadow}))*`,
clip: `${CssProp.C.shape}|auto`,
display_inside: CssProp.A.display_inside,
font_size: `${CssProp.A.absolute_size}|${CssProp.A.relative_size}|${CssProp.B.length_pos}|${CssProp.B.percentage_pos}`,
line_height: `normal|${CssProp.N.number_pos}|${CssProp.B.length_pos}|${CssProp.B.percentage_pos}`,
margin_left: CssProp.C.margin_width,
max_width: `${CssProp.B.length_pos}|${CssProp.B.percentage_pos}|none|auto`,
outline_style: CssProp.A.border_style,
padding_bottom: CssProp.C.padding_width,
padding_right: CssProp.C.padding_width,
perspective: `none|${CssProp.B.length}`,
richness: CssProp.N.number,
text_overflow: `((clip|ellipsis|${CssProp.B.string})\\s*){1,2}`,
top: `${CssProp.B.length}|${CssProp.B.percentage}|auto`,
width: `${CssProp.B.length_pos}|${CssProp.B.percentage_pos}|auto`,
z_index: `auto|${CssProp.B.z_index}`,
// Simplified background
background: `(((${CssProp.C.bg_position}\\s*(\\/\\s*${CssProp.C.bg_size})?)|(${CssProp.A.repeat_style})|(${CssProp.A.attachment})|(${CssProp.A.bg_origin})|(${CssProp.C.bg_image})|(${CssProp.C.color}))\\s*)+`,
background_size: `${CssProp.C.bg_size}(,\\s*${CssProp.C.bg_size})*`,
border_bottom_left_radius: `(${CssProp.B.length}|${CssProp.B.percentage})(\\s*(${CssProp.B.length}|${CssProp.B.percentage}))?`,
border_bottom_width: CssProp.C.border_width,
border_left_style: CssProp.A.border_style,
border_right_style: CssProp.A.border_style,
border_top: `((${CssProp.C.border_width}|${CssProp.A.border_style}|${CssProp.C.color})\\s*){1,3}`,
bottom: `${CssProp.B.len_or_perc}|auto`,
list_style: `((${CssProp.AP.list_style_type}|${CssProp.AP.list_style_position}|${CssProp.C.image}|none})\\s*){1,3}`,
margin_top: CssProp.C.margin_width,
outline: `((${CssProp.C.color}|invert|${CssProp.A.border_style}|${CssProp.C.border_width})\\s*){1,3}`,
overflow_y: CssProp.AP.overflow_x,
pitch: `${CssProp.B.frequency}|x-low|low|medium|high|x-high`,
vertical_align: `baseline|sub|super|top|text-top|middle|bottom|text-bottom|${CssProp.B.len_or_perc}`,
word_spacing: `normal|${CssProp.B.length}`,
background_image: `${CssProp.C.bg_image}(,\\s*${CssProp.C.bg_image})*`,
border_bottom_right_radius: `(${CssProp.B.length}|${CssProp.B.percentage})(\\s*(${CssProp.B.length}|${CssProp.B.percentage}))?`,
border_left_width: CssProp.C.border_width,
border_right_width: CssProp.C.border_width,
left: `${CssProp.B.len_or_perc}|auto`,
margin_bottom: CssProp.C.margin_width,
pause_after: `${CssProp.B.time}|${CssProp.B.percentage}`,
speech_rate: `${CssProp.N.number}|x-slow|slow|medium|fast|x-fast|faster|slower`,
transition_duration: `${CssProp.B.time}(,\\s*${CssProp.B.time})*`,
border_bottom: `((${CssProp.C.border_width}|${CssProp.A.border_style}|${CssProp.C.color})\\s*){1,3}`,
border_right: `((${CssProp.C.border_width}|${CssProp.A.border_style}|${CssProp.C.color})\\s*){1,3}`,
margin: `((${CssProp.C.margin_width})\\s*){1,4}`,
padding_left: CssProp.C.padding_width,
border_left: `((${CssProp.C.border_width}|${CssProp.A.border_style}|${CssProp.C.color})\\s*){1,3}`,
quotes: `(${CssProp.B.string}\\s*${CssProp.B.string})+|none`,
border_top_right_radius: `(${CssProp.B.length}|${CssProp.B.percentage})(\\s*(${CssProp.B.length}|${CssProp.B.percentage}))?`,
min_width: `${CssProp.B.length_pos}|${CssProp.B.percentage_pos}|auto`
};
private static readonly _CP1 = {
font: `(((((${CssProp.AP.font_style}|${CssProp.AP.font_variant}|${CssProp.AP.font_weight})\\s*){1,3})?\\s*(${CssProp._CP.font_size})\\s*(\\/\\s*(${CssProp._CP.line_height}))?\\s+(${CssProp._CP.font_family}))|caption|icon|menu|message-box|small-caption|status-bar)`
};
private static readonly CP = { ...CssProp._CP, ...CssProp._CP1 };
// CSS Property value validation regular expressions for use with sanitize-html
static BORDER_COLLAPSE = CssProp.reg(CssProp.AP.border_collapse);
static BOX = CssProp.reg(CssProp.AP.box);
static BOX_SIZING = CssProp.reg(CssProp.AP.box_sizing);
static CAPTION_SIDE = CssProp.reg(CssProp.AP.caption_side);
static CLEAR = CssProp.reg(CssProp.AP.clear);
static DIRECTION = CssProp.reg(CssProp.AP.direction);
static EMPTY_CELLS = CssProp.reg(CssProp.AP.empty_cells);
static FLOAT = CssProp.reg(CssProp.AP.float);
static FONT_STRETCH = CssProp.reg(CssProp.AP.font_stretch);
static FONT_STYLE = CssProp.reg(CssProp.AP.font_style);
static FONT_VARIANT = CssProp.reg(CssProp.AP.font_variant);
static FONT_WEIGHT = CssProp.reg(CssProp.AP.font_weight);
static LIST_STYLE_POSITION = CssProp.reg(CssProp.AP.list_style_position);
static LIST_STYLE_TYPE = CssProp.reg(CssProp.AP.list_style_type);
static OVERFLOW = CssProp.reg(CssProp.AP.overflow);
static OVERFLOW_WRAP = CssProp.reg(CssProp.AP.overflow_wrap);
static OVERFLOW_X = CssProp.reg(CssProp.AP.overflow_x);
static PAGE_BREAK_AFTER = CssProp.reg(CssProp.AP.page_break_after);
static PAGE_BREAK_BEFORE = CssProp.reg(CssProp.AP.page_break_before);
static PAGE_BREAK_INSIDE = CssProp.reg(CssProp.AP.page_break_inside);
static POSITION = CssProp.reg(CssProp.AP.position);
static RESIZE = CssProp.reg(CssProp.AP.resize);
static SPEAK = CssProp.reg(CssProp.AP.speak);
static SPEAK_HEADER = CssProp.reg(CssProp.AP.speak_header);
static SPEAK_NUMERAL = CssProp.reg(CssProp.AP.speak_numeral);
static SPEAK_PUNCTUATION = CssProp.reg(CssProp.AP.speak_punctuation);
static TABLE_LAYOUT = CssProp.reg(CssProp.AP.table_layout);
static TEXT_ALIGN = CssProp.reg(CssProp.AP.text_align);
static TEXT_DECORATION = CssProp.reg(CssProp.AP.text_decoration);
static TEXT_TRANSFORM = CssProp.reg(CssProp.AP.text_transform);
static TEXT_WRAP = CssProp.reg(CssProp.AP.text_wrap);
static UNICODE_BIDI = CssProp.reg(CssProp.AP.unicode_bidi);
static VISIBILITY = CssProp.reg(CssProp.AP.visibility);
static WHITE_SPACE = CssProp.reg(CssProp.AP.white_space);
static WORD_BREAK = CssProp.reg(CssProp.AP.word_break);
static BACKGROUND_ATTACHMENT = CssProp.reg(CssProp.CP.background_attachment);
static BACKGROUND_COLOR = CssProp.reg(CssProp.CP.background_color);
static BACKGROUND_ORIGIN = CssProp.reg(CssProp.CP.background_origin);
static BACKGROUND_REPEAT = CssProp.reg(CssProp.CP.background_repeat);
static BORDER = CssProp.reg(CssProp.CP.border);
static BORDER_RADIUS = CssProp.reg(CssProp.CP.border_radius);
static BORDER_SPACING = CssProp.reg(CssProp.CP.border_spacing);
static BORDER_TOP_COLOR = CssProp.reg(CssProp.CP.border_top_color);
static BORDER_TOP_STYLE = CssProp.reg(CssProp.CP.border_top_style);
static BORDER_WIDTH = CssProp.reg(CssProp.CP.border_width);
static COLOR = CssProp.reg(CssProp.CP.color);
static CURSOR = CssProp.reg(CssProp.CP.cursor);
static DISPLAY = CssProp.reg(CssProp.CP.display);
static DISPLAY_OUTSIDE = CssProp.reg(CssProp.CP.display_outside);
static ELEVATION = CssProp.reg(CssProp.CP.elevation);
static FONT_FAMILY = CssProp.reg(CssProp.CP.font_family);
static HEIGHT = CssProp.reg(CssProp.CP.height);
static LETTER_SPACING = CssProp.reg(CssProp.CP.letter_spacing);
static LIST_STYLE_IMAGE = CssProp.reg(CssProp.CP.list_style_image);
static MARGIN_RIGHT = CssProp.reg(CssProp.CP.margin_right);
static MAX_HEIGHT = CssProp.reg(CssProp.CP.max_height);
static MIN_HEIGHT = CssProp.reg(CssProp.CP.min_height);
static OPACITY = CssProp.reg(CssProp.CP.opacity);
static OUTLINE_COLOR = CssProp.reg(CssProp.CP.outline_color);
static OUTLINE_WIDTH = CssProp.reg(CssProp.CP.outline_width);
static PADDING = CssProp.reg(CssProp.CP.padding);
static PADDING_TOP = CssProp.reg(CssProp.CP.padding_top);
static PITCH_RANGE = CssProp.reg(CssProp.CP.pitch_range);
static RIGHT = CssProp.reg(CssProp.CP.right);
static STRESS = CssProp.reg(CssProp.CP.stress);
static TEXT_INDENT = CssProp.reg(CssProp.CP.text_indent);
static TEXT_SHADOW = CssProp.reg(CssProp.CP.text_shadow);
static VOLUME = CssProp.reg(CssProp.CP.volume);
static WORD_WRAP = CssProp.reg(CssProp.CP.word_wrap);
static ZOOM = CssProp.reg(CssProp.CP.zoom);
static BACKFACE_VISIBILITY = CssProp.reg(CssProp.CP.backface_visibility);
static BACKGROUND_CLIP = CssProp.reg(CssProp.CP.background_clip);
static BACKGROUND_POSITION = CssProp.reg(CssProp.CP.background_position);
static BORDER_BOTTOM_COLOR = CssProp.reg(CssProp.CP.border_bottom_color);
static BORDER_BOTTOM_STYLE = CssProp.reg(CssProp.CP.border_bottom_style);
static BORDER_COLOR = CssProp.reg(CssProp.CP.border_color);
static BORDER_LEFT_COLOR = CssProp.reg(CssProp.CP.border_left_color);
static BORDER_RIGHT_COLOR = CssProp.reg(CssProp.CP.border_right_color);
static BORDER_STYLE = CssProp.reg(CssProp.CP.border_style);
static BORDER_TOP_LEFT_RADIUS = CssProp.reg(
CssProp.CP.border_top_left_radius
);
static BORDER_TOP_WIDTH = CssProp.reg(CssProp.CP.border_top_width);
static BOX_SHADOW = CssProp.reg(CssProp.CP.box_shadow);
static CLIP = CssProp.reg(CssProp.CP.clip);
static DISPLAY_INSIDE = CssProp.reg(CssProp.CP.display_inside);
static FONT_SIZE = CssProp.reg(CssProp.CP.font_size);
static LINE_HEIGHT = CssProp.reg(CssProp.CP.line_height);
static MARGIN_LEFT = CssProp.reg(CssProp.CP.margin_left);
static MAX_WIDTH = CssProp.reg(CssProp.CP.max_width);
static OUTLINE_STYLE = CssProp.reg(CssProp.CP.outline_style);
static PADDING_BOTTOM = CssProp.reg(CssProp.CP.padding_bottom);
static PADDING_RIGHT = CssProp.reg(CssProp.CP.padding_right);
static PERSPECTIVE = CssProp.reg(CssProp.CP.perspective);
static RICHNESS = CssProp.reg(CssProp.CP.richness);
static TEXT_OVERFLOW = CssProp.reg(CssProp.CP.text_overflow);
static TOP = CssProp.reg(CssProp.CP.top);
static WIDTH = CssProp.reg(CssProp.CP.width);
static Z_INDEX = CssProp.reg(CssProp.CP.z_index);
static BACKGROUND = CssProp.reg(CssProp.CP.background);
static BACKGROUND_SIZE = CssProp.reg(CssProp.CP.background_size);
static BORDER_BOTTOM_LEFT_RADIUS = CssProp.reg(
CssProp.CP.border_bottom_left_radius
);
static BORDER_BOTTOM_WIDTH = CssProp.reg(CssProp.CP.border_bottom_width);
static BORDER_LEFT_STYLE = CssProp.reg(CssProp.CP.border_left_style);
static BORDER_RIGHT_STYLE = CssProp.reg(CssProp.CP.border_right_style);
static BORDER_TOP = CssProp.reg(CssProp.CP.border_top);
static BOTTOM = CssProp.reg(CssProp.CP.bottom);
static LIST_STYLE = CssProp.reg(CssProp.CP.list_style);
static MARGIN_TOP = CssProp.reg(CssProp.CP.margin_top);
static OUTLINE = CssProp.reg(CssProp.CP.outline);
static OVERFLOW_Y = CssProp.reg(CssProp.CP.overflow_y);
static PITCH = CssProp.reg(CssProp.CP.pitch);
static VERTICAL_ALIGN = CssProp.reg(CssProp.CP.vertical_align);
static WORD_SPACING = CssProp.reg(CssProp.CP.word_spacing);
static BACKGROUND_IMAGE = CssProp.reg(CssProp.CP.background_image);
static BORDER_BOTTOM_RIGHT_RADIUS = CssProp.reg(
CssProp.CP.border_bottom_right_radius
);
static BORDER_LEFT_WIDTH = CssProp.reg(CssProp.CP.border_left_width);
static BORDER_RIGHT_WIDTH = CssProp.reg(CssProp.CP.border_right_width);
static LEFT = CssProp.reg(CssProp.CP.left);
static MARGIN_BOTTOM = CssProp.reg(CssProp.CP.margin_bottom);
static PAUSE_AFTER = CssProp.reg(CssProp.CP.pause_after);
static SPEECH_RATE = CssProp.reg(CssProp.CP.speech_rate);
static TRANSITION_DURATION = CssProp.reg(CssProp.CP.transition_duration);
static BORDER_BOTTOM = CssProp.reg(CssProp.CP.border_bottom);
static BORDER_RIGHT = CssProp.reg(CssProp.CP.border_right);
static MARGIN = CssProp.reg(CssProp.CP.margin);
static PADDING_LEFT = CssProp.reg(CssProp.CP.padding_left);
static BORDER_LEFT = CssProp.reg(CssProp.CP.border_left);
static FONT = CssProp.reg(CssProp.CP.font);
static QUOTES = CssProp.reg(CssProp.CP.quotes);
static BORDER_TOP_RIGHT_RADIUS = CssProp.reg(
CssProp.CP.border_top_right_radius
);
static MIN_WIDTH = CssProp.reg(CssProp.CP.min_width);
}
/**
* A class to sanitize HTML strings.
*/
export class Sanitizer implements IRenderMime.ISanitizer {
/**
* Sanitize an HTML string.
*
* @param dirty - The dirty text.
*
* @param options - The optional sanitization options.
*
* @returns The sanitized string.
*/
sanitize(dirty: string, options?: IRenderMime.ISanitizerOptions): string {
return sanitize(dirty, { ...this._options, ...(options || {}) });
}
/**
* @returns Whether to replace URLs by HTML anchors.
*/
getAutolink(): boolean {
return this._autolink;
}
/**
* Set the allowed schemes
*
* @param scheme Allowed schemes
*/
setAllowedSchemes(scheme: Array<string>): void {
// Force copy of `scheme`
this._options.allowedSchemes = [...scheme];
}
/**
* Set the URL replacement boolean.
*
* @param autolink URL replacement boolean.
*/
setAutolink(autolink: boolean): void {
this._autolink = autolink;
}
private _autolink: boolean = true;
private _options: sanitize.IOptions = {
// HTML tags that are allowed to be used. Tags were extracted from Google Caja
allowedTags: [
'a',
'abbr',
'acronym',
'address',
'area',
'article',
'aside',
'audio',
'b',
'bdi',
'bdo',
'big',
'blockquote',
'br',
'button',
'canvas',
'caption',
'center',
'cite',
'code',
'col',
'colgroup',
'colspan',
'command',
'data',
'datalist',
'dd',
'del',
'details',
'dfn',
'dir',
'div',
'dl',
'dt',
'em',
'fieldset',
'figcaption',
'figure',
'font',
'footer',
'form',
'h1',
'h2',
'h3',
'h4',
'h5',
'h6',
'header',
'hgroup',
'hr',
'i',
// 'iframe' is allowed by Google Caja, but disallowed by default by sanitize-html
// , 'iframe'
'img',
'input',
'ins',
'kbd',
'label',
'legend',
'li',
'map',
'mark',
'menu',
'meter',
'nav',
'nobr',
'ol',
'optgroup',
'option',
'output',
'p',
'pre',
'progress',
'q',
'rowspan',
's',
'samp',
'section',
'select',
'small',
'source',
'span',
'strike',
'strong',
'sub',
'summary',
'sup',
'table',
'tbody',
'td',
'textarea',
'tfoot',
'th',
'thead',
'time',
'tr',
'track',
'tt',
'u',
'ul',
'var',
'video',
'wbr'
],
// Attributes that HTML tags are allowed to have, extracted from Google Caja.
// See https://github.com/jupyterlab/jupyterlab/issues/1812#issuecomment-285848435
allowedAttributes: {
'*': [
'class',
'dir',
'draggable',
'hidden',
'id',
'inert',
'itemprop',
'itemref',
'itemscope',
'lang',
'spellcheck',
'style',
'title',
'translate'
],
// 'rel' and 'target' were *not* allowed by Google Caja
a: [
'accesskey',
'coords',
'href',
'hreflang',
'name',
'rel',
'shape',
'tabindex',
'target',
'type'
],
area: [
'accesskey',
'alt',
'coords',
'href',
'nohref',
'shape',
'tabindex'
],
// 'autoplay' was *not* allowed by Google Caja
audio: [
'autoplay',
'controls',
'loop',
'mediagroup',
'muted',
'preload',
'src'
],
bdo: ['dir'],
blockquote: ['cite'],
br: ['clear'],
button: [
'accesskey',
'data-commandlinker-args',
'data-commandlinker-command',
'disabled',
'name',
'tabindex',
'type',
'value'
],
canvas: ['height', 'width'],
caption: ['align'],
col: ['align', 'char', 'charoff', 'span', 'valign', 'width'],
colgroup: ['align', 'char', 'charoff', 'span', 'valign', 'width'],
command: [
'checked',
'command',
'disabled',
'icon',
'label',
'radiogroup',
'type'
],
data: ['value'],
del: ['cite', 'datetime'],
details: ['open'],
dir: ['compact'],
div: ['align'],
dl: ['compact'],
fieldset: ['disabled'],
font: ['color', 'face', 'size'],
form: [
'accept',
'autocomplete',
'enctype',
'method',
'name',
'novalidate'
],
h1: ['align'],
h2: ['align'],
h3: ['align'],
h4: ['align'],
h5: ['align'],
h6: ['align'],
hr: ['align', 'noshade', 'size', 'width'],
iframe: [
'align',
'frameborder',
'height',
'marginheight',
'marginwidth',
'width'
],
img: [
'align',
'alt',
'border',
'height',
'hspace',
'ismap',
'name',
'src',
'usemap',
'vspace',
'width'
],
input: [
'accept',
'accesskey',
'align',
'alt',
'autocomplete',
'checked',
'disabled',
'inputmode',
'ismap',
'list',
'max',
'maxlength',
'min',
'multiple',
'name',
'placeholder',
'readonly',
'required',
'size',
'src',
'step',
'tabindex',
'type',
'usemap',
'value'
],
ins: ['cite', 'datetime'],
label: ['accesskey', 'for'],
legend: ['accesskey', 'align'],
li: ['type', 'value'],
map: ['name'],
menu: ['compact', 'label', 'type'],
meter: ['high', 'low', 'max', 'min', 'value'],
ol: ['compact', 'reversed', 'start', 'type'],
optgroup: ['disabled', 'label'],
option: ['disabled', 'label', 'selected', 'value'],
output: ['for', 'name'],
p: ['align'],
pre: ['width'],
progress: ['max', 'min', 'value'],
q: ['cite'],
select: [
'autocomplete',
'disabled',
'multiple',
'name',
'required',
'size',
'tabindex'
],
source: ['type'],
table: [
'align',
'bgcolor',
'border',
'cellpadding',
'cellspacing',
'frame',
'rules',
'summary',
'width'
],
tbody: ['align', 'char', 'charoff', 'valign'],
td: [
'abbr',
'align',
'axis',
'bgcolor',
'char',
'charoff',
'colspan',
'headers',
'height',
'nowrap',
'rowspan',
'scope',
'valign',
'width'
],
textarea: [
'accesskey',
'autocomplete',
'cols',
'disabled',
'inputmode',
'name',
'placeholder',
'readonly',
'required',
'rows',
'tabindex',
'wrap'
],
tfoot: ['align', 'char', 'charoff', 'valign'],
th: [
'abbr',
'align',
'axis',
'bgcolor',
'char',
'charoff',
'colspan',
'headers',
'height',
'nowrap',
'rowspan',
'scope',
'valign',
'width'
],
thead: ['align', 'char', 'charoff', 'valign'],
tr: ['align', 'bgcolor', 'char', 'charoff', 'valign'],
track: ['default', 'kind', 'label', 'srclang'],
ul: ['compact', 'type'],
video: [
'autoplay',
'controls',
'height',
'loop',
'mediagroup',
'muted',
'poster',
'preload',
'src',
'width'
]
},
// Inline CSS styles that HTML tags may have (and their allowed values)
allowedStyles: {
// To simplify the data, all styles are allowed on all tags that allow the style attribute
'*': {
'backface-visibility': [CssProp.BACKFACE_VISIBILITY],
background: [CssProp.BACKGROUND],
'background-attachment': [CssProp.BACKGROUND_ATTACHMENT],
'background-clip': [CssProp.BACKGROUND_CLIP],
'background-color': [CssProp.BACKGROUND_COLOR],
'background-image': [CssProp.BACKGROUND_IMAGE],
'background-origin': [CssProp.BACKGROUND_ORIGIN],
'background-position': [CssProp.BACKGROUND_POSITION],
'background-repeat': [CssProp.BACKGROUND_REPEAT],
'background-size': [CssProp.BACKGROUND_SIZE],
border: [CssProp.BORDER],
'border-bottom': [CssProp.BORDER_BOTTOM],
'border-bottom-color': [CssProp.BORDER_BOTTOM_COLOR],
'border-bottom-left-radius': [CssProp.BORDER_BOTTOM_LEFT_RADIUS],
'border-bottom-right-radius': [CssProp.BORDER_BOTTOM_RIGHT_RADIUS],
'border-bottom-style': [CssProp.BORDER_BOTTOM_STYLE],
'border-bottom-width': [CssProp.BORDER_BOTTOM_WIDTH],
'border-collapse': [CssProp.BORDER_COLLAPSE],
'border-color': [CssProp.BORDER_COLOR],
'border-left': [CssProp.BORDER_LEFT],
'border-left-color': [CssProp.BORDER_LEFT_COLOR],
'border-left-style': [CssProp.BORDER_LEFT_STYLE],
'border-left-width': [CssProp.BORDER_LEFT_WIDTH],
'border-radius': [CssProp.BORDER_RADIUS],
'border-right': [CssProp.BORDER_RIGHT],
'border-right-color': [CssProp.BORDER_RIGHT_COLOR],
'border-right-style': [CssProp.BORDER_RIGHT_STYLE],
'border-right-width': [CssProp.BORDER_RIGHT_WIDTH],
'border-spacing': [CssProp.BORDER_SPACING],
'border-style': [CssProp.BORDER_STYLE],
'border-top': [CssProp.BORDER_TOP],
'border-top-color': [CssProp.BORDER_TOP_COLOR],
'border-top-left-radius': [CssProp.BORDER_TOP_LEFT_RADIUS],
'border-top-right-radius': [CssProp.BORDER_TOP_RIGHT_RADIUS],
'border-top-style': [CssProp.BORDER_TOP_STYLE],
'border-top-width': [CssProp.BORDER_TOP_WIDTH],
'border-width': [CssProp.BORDER_WIDTH],
bottom: [CssProp.BOTTOM],
box: [CssProp.BOX],
'box-shadow': [CssProp.BOX_SHADOW],
'box-sizing': [CssProp.BOX_SIZING],
'caption-side': [CssProp.CAPTION_SIDE],
clear: [CssProp.CLEAR],
clip: [CssProp.CLIP],
color: [CssProp.COLOR],
cursor: [CssProp.CURSOR],
direction: [CssProp.DIRECTION],
display: [CssProp.DISPLAY],
'display-inside': [CssProp.DISPLAY_INSIDE],
'display-outside': [CssProp.DISPLAY_OUTSIDE],
elevation: [CssProp.ELEVATION],
'empty-cells': [CssProp.EMPTY_CELLS],
float: [CssProp.FLOAT],
font: [CssProp.FONT],
'font-family': [CssProp.FONT_FAMILY],
'font-size': [CssProp.FONT_SIZE],
'font-stretch': [CssProp.FONT_STRETCH],
'font-style': [CssProp.FONT_STYLE],
'font-variant': [CssProp.FONT_VARIANT],
'font-weight': [CssProp.FONT_WEIGHT],
height: [CssProp.HEIGHT],
left: [CssProp.LEFT],
'letter-spacing': [CssProp.LETTER_SPACING],
'line-height': [CssProp.LINE_HEIGHT],
'list-style': [CssProp.LIST_STYLE],
'list-style-image': [CssProp.LIST_STYLE_IMAGE],
'list-style-position': [CssProp.LIST_STYLE_POSITION],
'list-style-type': [CssProp.LIST_STYLE_TYPE],
margin: [CssProp.MARGIN],
'margin-bottom': [CssProp.MARGIN_BOTTOM],
'margin-left': [CssProp.MARGIN_LEFT],
'margin-right': [CssProp.MARGIN_RIGHT],
'margin-top': [CssProp.MARGIN_TOP],
'max-height': [CssProp.MAX_HEIGHT],
'max-width': [CssProp.MAX_WIDTH],
'min-height': [CssProp.MIN_HEIGHT],
'min-width': [CssProp.MIN_WIDTH],
opacity: [CssProp.OPACITY],
outline: [CssProp.OUTLINE],
'outline-color': [CssProp.OUTLINE_COLOR],
'outline-style': [CssProp.OUTLINE_STYLE],
'outline-width': [CssProp.OUTLINE_WIDTH],
overflow: [CssProp.OVERFLOW],
'overflow-wrap': [CssProp.OVERFLOW_WRAP],
'overflow-x': [CssProp.OVERFLOW_X],
'overflow-y': [CssProp.OVERFLOW_Y],
padding: [CssProp.PADDING],
'padding-bottom': [CssProp.PADDING_BOTTOM],
'padding-left': [CssProp.PADDING_LEFT],
'padding-right': [CssProp.PADDING_RIGHT],
'padding-top': [CssProp.PADDING_TOP],
'page-break-after': [CssProp.PAGE_BREAK_AFTER],
'page-break-before': [CssProp.PAGE_BREAK_BEFORE],
'page-break-inside': [CssProp.PAGE_BREAK_INSIDE],
'pause-after': [CssProp.PAUSE_AFTER],
perspective: [CssProp.PERSPECTIVE],
pitch: [CssProp.PITCH],
'pitch-range': [CssProp.PITCH_RANGE],
position: [CssProp.POSITION],
quotes: [CssProp.QUOTES],
resize: [CssProp.RESIZE],
richness: [CssProp.RICHNESS],
right: [CssProp.RIGHT],
speak: [CssProp.SPEAK],
'speak-header': [CssProp.SPEAK_HEADER],
'speak-numeral': [CssProp.SPEAK_NUMERAL],
'speak-punctuation': [CssProp.SPEAK_PUNCTUATION],
'speech-rate': [CssProp.SPEECH_RATE],
stress: [CssProp.STRESS],
'table-layout': [CssProp.TABLE_LAYOUT],
'text-align': [CssProp.TEXT_ALIGN],
'text-decoration': [CssProp.TEXT_DECORATION],
'text-indent': [CssProp.TEXT_INDENT],
'text-overflow': [CssProp.TEXT_OVERFLOW],
'text-shadow': [CssProp.TEXT_SHADOW],
'text-transform': [CssProp.TEXT_TRANSFORM],
'text-wrap': [CssProp.TEXT_WRAP],
top: [CssProp.TOP],
'unicode-bidi': [CssProp.UNICODE_BIDI],
'vertical-align': [CssProp.VERTICAL_ALIGN],
visibility: [CssProp.VISIBILITY],
volume: [CssProp.VOLUME],
'white-space': [CssProp.WHITE_SPACE],
width: [CssProp.WIDTH],
'word-break': [CssProp.WORD_BREAK],
'word-spacing': [CssProp.WORD_SPACING],
'word-wrap': [CssProp.WORD_WRAP],
'z-index': [CssProp.Z_INDEX],
zoom: [CssProp.ZOOM]
}
},
transformTags: {
// Set the "rel" attribute for <a> tags to "nofollow".
a: sanitize.simpleTransform('a', { rel: 'nofollow' }),
// Set the "disabled" attribute for <input> tags.
input: sanitize.simpleTransform('input', { disabled: 'disabled' })
},
allowedSchemes: [...sanitize.defaults.allowedSchemes],
allowedSchemesByTag: {
// Allow 'attachment:' img src (used for markdown cell attachments).
img: sanitize.defaults.allowedSchemes.concat(['attachment'])
},
// Override of the default option, so we can skip 'src' attribute validation.
// 'src' Attributes are validated to be URIs, which does not allow for embedded (image) data.
// Since embedded data is no longer deemed to be a threat, validation can be skipped.
// See https://github.com/jupyterlab/jupyterlab/issues/5183
allowedSchemesAppliedToAttributes: ['href', 'cite']
};
}