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resizer.js
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resizer.js
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const fs = require('fs').promises;
const path = require('path');
const sharp = require('sharp');
const heicConvert = require('heic-convert');
const imageExtensions = require('./imageExtensions');
let processor_queue = [];
function _resizerGenerator(suffix, maxWidth) {
const width = parseInt(maxWidth);
if (!width) {
return undefined;
}
return async function (buffer, dir, fileNameWithoutSuffix) {
return await sharp(buffer)
.resize({ width, withoutEnlargement: true })
.toFile(path.resolve(dir, fileNameWithoutSuffix + suffix + '.webp'))
.catch(console.error);
};
}
async function _resize(buffer, dir, fileNameWithoutSuffix) {
for (const processor of processor_queue) {
await processor(buffer, dir, fileNameWithoutSuffix);
}
}
async function _process(files) {
for (const file of files) {
const filePath = file.path;
const stats = await fs.stat(filePath);
if (stats.isFile()) {
let { dir, ext, name } = path.parse(filePath);
ext = ext.toLowerCase();
if (imageExtensions.includes(ext)) {
const inputBuffer = await fs.readFile(filePath);
await _resize(inputBuffer, dir, name);
} else if (ext === '.heic') {
const inputBuffer = await fs.readFile(filePath);
const outputBuffer = await heicConvert({
buffer: inputBuffer,
format: 'JPEG',
quality: 1,
});
await _resize(outputBuffer, dir, name);
}
} else if (stats.isDirectory()) {
const children = await fs.readdir(filePath);
await _process(
children.map((child) => ({
path: path.resolve(filePath, child),
}))
);
}
}
}
exports.handle = async function handle(payload) {
const { files, targetPlatform } = payload;
processor_queue = targetPlatform
.map(({ suffix, max_width }) => _resizerGenerator(suffix, max_width))
.filter((i) => i !== undefined);
await _process(files);
};