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47 lines
942 B
JavaScript
47 lines
942 B
JavaScript
'use strict';
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var fs = require('fs');
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var path = require('path');
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var mkdirp = require('mkdirp');
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var winston = require('winston');
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var filePath = path.join(__dirname, '../../build/cache-buster');
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var cached;
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// cache buster is an 11-character, lowercase, alphanumeric string
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function generate() {
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return (Math.random() * 1e18).toString(32).slice(0, 11);
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}
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exports.write = function write(callback) {
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mkdirp(path.dirname(filePath), function (err) {
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if (err) {
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return callback(err);
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}
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fs.writeFile(filePath, generate(), callback);
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});
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};
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exports.read = function read(callback) {
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if (cached) {
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return callback(null, cached);
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}
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fs.readFile(filePath, function (err, buffer) {
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if (err) {
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winston.warn('[cache-buster] could not read cache buster: ' + err.message);
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return callback();
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}
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buffer = buffer.toString();
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if (buffer) {
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cached = buffer;
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return callback(null, cached);
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}
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callback();
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});
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};
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