54 lines
2.1 KiB
JavaScript
54 lines
2.1 KiB
JavaScript
/*
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Copyright 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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const fs = require("fs");
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const path = require("path");
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const xxhash = require('xxhashjs');
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function createHash(content) {
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const hasher = new xxhash.h32(0);
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hasher.update(content);
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return hasher.digest();
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}
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/**
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* Builds a new svg with the colors replaced and returns its location.
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* @param {string} svgLocation The location of the input svg file
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* @param {string} primaryColor Primary color for the new svg
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* @param {string} secondaryColor Secondary color for the new svg
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*/
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module.exports.buildColorizedSVG = function (svgLocation, primaryColor, secondaryColor) {
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const svgCode = fs.readFileSync(svgLocation, { encoding: "utf8"});
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let coloredSVGCode = svgCode.replaceAll("#ff00ff", primaryColor);
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coloredSVGCode = coloredSVGCode.replaceAll("#00ffff", secondaryColor);
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if (svgCode === coloredSVGCode) {
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throw new Error("svg-colorizer made no color replacements! The input svg should only contain colors #ff00ff (primary, case-sensitive) and #00ffff (secondary, case-sensitive).");
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}
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const fileName = svgLocation.match(/.+\/(.+\.svg)/)[1];
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const outputName = `${fileName.substring(0, fileName.length - 4)}-${createHash(coloredSVGCode)}.svg`;
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const outputPath = path.resolve(__dirname, "../../.tmp");
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try {
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fs.mkdirSync(outputPath);
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}
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catch (e) {
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if (e.code !== "EEXIST") {
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throw e;
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}
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}
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const outputFile = `${outputPath}/${outputName}`;
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fs.writeFileSync(outputFile, coloredSVGCode);
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return outputFile;
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}
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