/*
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MIT License http://www.opensource.org/licenses/mit-license.php
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Author Natsu @xiaoxiaojx
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*/
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"use strict";
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// data URL scheme: "data:text/javascript;charset=utf-8;base64,some-string"
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// http://www.ietf.org/rfc/rfc2397.txt
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const URIRegEx = /^data:([^;,]+)?((?:;[^;,]+)*?)(?:;(base64)?)?,(.*)$/i;
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/**
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* @param {string} uri data URI
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* @returns {Buffer | null} decoded data
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*/
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const decodeDataURI = (uri) => {
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const match = URIRegEx.exec(uri);
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if (!match) return null;
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const isBase64 = match[3];
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const body = match[4];
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if (isBase64) {
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return Buffer.from(body, "base64");
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}
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// CSS allows to use `data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg"><rect width="100%" height="100%" style="stroke: rgb(223,224,225); stroke-width: 2px; fill: none; stroke-dasharray: 6px 3px" /></svg>`
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// so we return original body if we can't `decodeURIComponent`
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try {
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return Buffer.from(decodeURIComponent(body), "ascii");
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} catch (_) {
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return Buffer.from(body, "ascii");
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}
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};
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module.exports = {
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URIRegEx,
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decodeDataURI
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};
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