100 lines
3.8 KiB
JavaScript
100 lines
3.8 KiB
JavaScript
"use strict";
|
|
function isPlainObject(value) {
|
|
return Boolean(value &&
|
|
!Array.isArray(value) &&
|
|
typeof value === 'object');
|
|
}
|
|
function getHeaderValueFromOptions(options) {
|
|
var FEATURES = {
|
|
accelerometer: 'accelerometer',
|
|
ambientLightSensor: 'ambient-light-sensor',
|
|
autoplay: 'autoplay',
|
|
camera: 'camera',
|
|
documentDomain: 'document-domain',
|
|
documentWrite: 'document-write',
|
|
encryptedMedia: 'encrypted-media',
|
|
fontDisplayLateSwap: 'font-display-late-swap',
|
|
fullscreen: 'fullscreen',
|
|
geolocation: 'geolocation',
|
|
gyroscope: 'gyroscope',
|
|
layoutAnimations: 'layout-animations',
|
|
legacyImageFormats: 'legacy-image-formats',
|
|
loadingFrameDefaultEager: 'loading-frame-default-eager',
|
|
magnetometer: 'magnetometer',
|
|
microphone: 'microphone',
|
|
midi: 'midi',
|
|
notifications: 'notifications',
|
|
oversizedImages: 'oversized-images',
|
|
payment: 'payment',
|
|
pictureInPicture: 'picture-in-picture',
|
|
push: 'push',
|
|
serial: 'serial',
|
|
speaker: 'speaker',
|
|
syncScript: 'sync-script',
|
|
syncXhr: 'sync-xhr',
|
|
unoptimizedImages: 'unoptimized-images',
|
|
unoptimizedLosslessImages: 'unoptimized-lossless-images',
|
|
unoptimizedLossyImages: 'unoptimized-lossy-images',
|
|
unsizedMedia: 'unsized-media',
|
|
usb: 'usb',
|
|
verticalScroll: 'vertical-scroll',
|
|
vibrate: 'vibrate',
|
|
vr: 'vr',
|
|
wakeLock: 'wake-lock',
|
|
xr: 'xr',
|
|
};
|
|
if (!isPlainObject(options)) {
|
|
throw new Error('featurePolicy must be called with an object argument. See the documentation.');
|
|
}
|
|
var features = options.features;
|
|
if (!isPlainObject(features)) {
|
|
throw new Error('featurePolicy must have a single key, "features", which is an object of features. See the documentation.');
|
|
}
|
|
var result = Object.keys(features).map(function (featureKeyCamelCase) {
|
|
if (!Object.prototype.hasOwnProperty.call(FEATURES, featureKeyCamelCase)) {
|
|
throw new Error("featurePolicy does not support the \"" + featureKeyCamelCase + "\" feature.");
|
|
}
|
|
var featureValue = features[featureKeyCamelCase];
|
|
if (!Array.isArray(featureValue) || featureValue.length === 0) {
|
|
throw new Error("The value of the \"" + featureKeyCamelCase + "\" feature must be a non-empty array.");
|
|
}
|
|
var containsStar = false;
|
|
var containsNone = false;
|
|
featureValue.forEach(function (allowed) {
|
|
if (allowed === '*') {
|
|
containsStar = true;
|
|
}
|
|
else if (allowed === "'none'") {
|
|
containsNone = true;
|
|
}
|
|
else if (allowed === 'self') {
|
|
throw new Error("'self' must be quoted.");
|
|
}
|
|
else if (allowed === 'none') {
|
|
throw new Error("'none' must be quoted.");
|
|
}
|
|
});
|
|
if (featureValue.length > 1) {
|
|
if (containsStar) {
|
|
throw new Error("The value of the \"" + featureKeyCamelCase + "\" feature cannot contain * and other values.");
|
|
}
|
|
else if (containsNone) {
|
|
throw new Error("The value of the \"" + featureKeyCamelCase + "\" feature cannot contain 'none' and other values.");
|
|
}
|
|
}
|
|
var featureKeyDashed = FEATURES[featureKeyCamelCase];
|
|
return [featureKeyDashed].concat(featureValue).join(' ');
|
|
}).join(';');
|
|
if (result.length === 0) {
|
|
throw new Error('At least one feature is required.');
|
|
}
|
|
return result;
|
|
}
|
|
module.exports = function featurePolicy(options) {
|
|
var headerValue = getHeaderValueFromOptions(options);
|
|
return function featurePolicy(_req, res, next) {
|
|
res.setHeader('Feature-Policy', headerValue);
|
|
next();
|
|
};
|
|
};
|