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feat: temp add unsafe-svg directive till upstream PR merged
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packages/uikit-workshop/src/scripts/lit-components/pl-icon/unsafe-svg.ts
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/** | ||
* @license | ||
* Copyright (c) 2017 The Polymer Project Authors. All rights reserved. | ||
* This code may only be used under the BSD style license found at | ||
* http://polymer.github.io/LICENSE.txt | ||
* The complete set of authors may be found at | ||
* http://polymer.github.io/AUTHORS.txt | ||
* The complete set of contributors may be found at | ||
* http://polymer.github.io/CONTRIBUTORS.txt | ||
* Code distributed by Google as part of the polymer project is also | ||
* subject to an additional IP rights grant found at | ||
* http://polymer.github.io/PATENTS.txt | ||
*/ | ||
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import { reparentNodes } from 'lit-html/lib/dom.js'; | ||
import { isPrimitive } from 'lit-html/lib/parts.js'; | ||
import { directive, NodePart, Part } from 'lit-html/lit-html.js'; | ||
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interface PreviousValue { | ||
readonly value: unknown; | ||
readonly fragment: DocumentFragment; | ||
} | ||
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// For each part, remember the value that was last rendered to the part by the | ||
// unsafeSVG directive, and the DocumentFragment that was last set as a value. | ||
// The DocumentFragment is used as a unique key to check if the last value | ||
// rendered to the part was with unsafeSVG. If not, we'll always re-render the | ||
// value passed to unsafeSVG. | ||
const previousValues = new WeakMap<NodePart, PreviousValue>(); | ||
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/** | ||
* Renders the result as SVG, rather than text. | ||
* | ||
* Note, this is unsafe to use with any user-provided input that hasn't been | ||
* sanitized or escaped, as it may lead to cross-site-scripting | ||
* vulnerabilities. | ||
*/ | ||
export const unsafeSVG = directive((value: unknown) => (part: Part): void => { | ||
if (!(part instanceof NodePart)) { | ||
throw new Error('unsafeSVG can only be used in text bindings'); | ||
} | ||
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const previousValue = previousValues.get(part); | ||
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if ( | ||
previousValue !== undefined && | ||
isPrimitive(value) && | ||
value === previousValue.value && | ||
part.value === previousValue.fragment | ||
) { | ||
return; | ||
} | ||
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const template = document.createElement('template'); | ||
template.innerHTML = `<svg>${value}</svg>`; | ||
const content = template.content; | ||
const svgElement = content.firstElementChild!; | ||
content.removeChild(svgElement); | ||
reparentNodes(content, svgElement.firstChild); | ||
const fragment = document.importNode(content, true); | ||
part.setValue(fragment); | ||
previousValues.set(part, { value, fragment }); | ||
}); |