-
-
Notifications
You must be signed in to change notification settings - Fork 0
/
trust-policies.js
243 lines (217 loc) · 6.16 KB
/
trust-policies.js
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
/**
* @copyright 2023-2024 Chris Zuber <admin@kernvalley.us>
*/
import { createPolicy } from './trust.js';
import { callOnce } from './utility.js';
import { attributes, elements, comments } from '@aegisjsproject/sanitizer/config/base.js';
export { getYouTubePolicy } from'./google/policies.js';
/*
* Do NOT export this! It is dangerous and MUST only be used internally.
* But it still needs to be added to `trusted-types` in CSP if used.
*/
const getRawHTMLPolicy = callOnce(() => {
return createPolicy('trust-raw#html', { createHTML: input => input });
});
export const trustedOrigins = [
location.origin,
'https://cdn.kernvalley.us',
'https://unpkg.com',
];
export const googleOrigins = [
'https://www.googletagmanager.com',
'https://www.google-analytics.com',
];
export const youtubeEmbedOrigins = [
'https://www.youtube.com',
'https://www.youtube-nocookie.com',
];
export const youtubeEmbeds = youtubeEmbedOrigins.map(origin => `${origin}/embed/`);
export function isTrustedScriptOrigin(input) {
const { origin } = new URL(input, document.baseURI);
return trustedOrigins.includes(origin);
}
export function isGoogleOrigin(input) {
const { origin } = new URL(input, document.baseURI);
return googleOrigins.includes(origin);
}
export function isYouTubeEmbed(input) {
const { origin, pathname } = new URL(input, document.baseURI);
return youtubeEmbedOrigins.includes(origin) && pathname.startsWith('/embed/');
}
export function escapeHTML(input) {
const el = document.createElement('div');
el.textContent = input;
return el.innerHTML;
}
export function stripHTML(input) {
const tmp = document.createElement('template');
const policy = getRawHTMLPolicy();
tmp.innerHTML = policy.createHTML(`<div>${input}</div>`);
return tmp.content.firstElementChild.textContent;
}
export function sanitizeHTML(input, { elements, attributes, comments } = {}) {
if (Element.prototype.setHTML instanceof Function) {
const el = document.createElement('div');
el.setHTML(input, { sanitizer: { elements, attributes, comments }});
return el.innerHTML;
} else {
console.warn('Sanitizer not supported. Returning escaped HTML');
return escapeHTML(input);
}
}
export function isDisqusEmbedScript(input) {
return /^https:\/\/[\w-]+\.disqus\.com\/embed\.js$/.test(input);
}
export function isDisqusEmbed(input) {
return input.startsWith('https://disqus.com/embed/comments/');
}
export const createEmptyHTML = () => trustedTypes.emptyHTML;
export const createEmptyScript = () => trustedTypes.emptyScript;
/**
* @TODO: Add support for SVG
*/
export const sanitizerConfig = {
comments,
elements: [
...elements, 'krv-ad', 'krv-events', 'leaflet-map', 'leaflet-marker',
'youtube-player', 'spotify-player', 'weather-current', 'weather-forecast',
'github-user', 'github-repo', 'github-gist', 'wfd-events', 'codepen-embed',
'bacon-ipsum', 'facebook-post',
],
attributes: [
...attributes,
'theme',
'loading',
'source',
'medium',
'content',
'campaign',
'term',
'count',
'layout',
'center',
'zoom',
'tilesrc',
'allowlocate',
'allowfullscreen',
'zoomcontrol',
'minzoom',
'maxzoom',
'longitude',
'latitude',
'open',
'appid',
'postalcode',
'large',
'uri',
'user',
'bio',
'gist',
'file',
'repo',
'pen',
'tab',
'editable',
'clicktoload',
'lines',
'paras',
'start-with-lorem',
'filler',
'post',
'showtext',
],
};
export const getDefaultPolicy = callOnce(() => {
return createPolicy('default', {
createHTML: input => sanitizeHTML(input,{ elements, attributes, comments }),
createScript: createEmptyScript,
createScriptURL: input => {
if (isTrustedScriptOrigin(input)) {
return input;
} else {
throw new TypeError(`Disallowed script origin: ${input}`);
}
}
});
});
/**
* Instead of using this policy and setting `innerHTML`, you would do better
* to set `textContent` instead.
*/
export const getEscapeHTMLPolicy = callOnce(() => {
return createPolicy('escape#html', { createHTML: escapeHTML });
});
export const getStripHTMLPolicy = callOnce(() => {
return createPolicy('strip#html', { createHTML: stripHTML });
});
export const getJSONScriptPolicy = callOnce(() => {
return createPolicy('json#script', {
createScript: input => JSON.stringify(JSON.parse(input)),
});
});
export const getBlobScriptURLPolicy = callOnce(() => createPolicy('blob#script-url', {
createScriptURL: input => {
if (input.startsWith('blob:')) {
return input;
} else {
throw new TypeError(`${input} is not a blob: URI.`);
}
}
}));
export const getDataScriptURLPolicy = callOnce(() => createPolicy('data#script-url', {
createScriptURL: input => {
if (input.startsWith('data:')) {
return input;
} else {
throw new TypeError(`${input} is not a data: URI.`);
}
}
}));
// Disqus embeds are created via their script & must use default policy :(
export const getDefaultPolicyWithDisqus = callOnce(() => {
return createPolicy('default', {
createHTML: input => sanitizeHTML(input, { elements, attributes, comments }),
createScript: createEmptyScript,
createScriptURL: input => {
if (isTrustedScriptOrigin(input) || isDisqusEmbed(input)) {
return input;
} else {
throw new TypeError(`Disallowed script origin: ${input}`);
}
}
});
});
export const getKRVPolicy = callOnce(() => {
return createPolicy('krv', {
createHTML: input => sanitizeHTML(input, { elements, attributes, comments }),
createScript: createEmptyScript,
createScriptURL: input => {
if (isTrustedScriptOrigin(input)) {
return input;
} else {
throw new TypeError(`Disallowed script origin: ${input}`);
}
}
});
});
export const getGooglePolicy = callOnce(() => createPolicy('ga#script-url', {
createHTML: createEmptyHTML,
createScript: createEmptyScript,
createScriptURL: input => {
if (isGoogleOrigin(input)) {
return input;
} else {
throw new TypeError(`${input} is not a known Google origin.`);
}
}
}));
export const getDisqusPolicy = callOnce(() => createPolicy('disqus#script-url', {
createScriptURL: input => {
if (isDisqusEmbedScript(input)) {
return input;
} else {
throw new TypeError(`Invalid Disqus URL: ${input}`);
}
}
}));
export const getDefaultNoOpPolicy = callOnce(() => createPolicy('default', {}));