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78 lines
2.0 KiB
78 lines
2.0 KiB
var fs = require('fs')
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, crypto = require('crypto')
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, path = require('path')
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;
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/**
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* Check if a directory exists and create it on the fly if it is not the case
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* Does it recursively
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* cb is optional, signature: err
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*/
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function ensureDirectoryExists (dir, cb) {
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var callback = cb || function () {}
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, parts, currentPart
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;
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if (typeof dir === 'string') { return ensureDirectoryExists({ toTreat: dir, treated: '' }); }
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if (dir.toTreat.length === 0) { return callback(); }
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parts = dir.toTreat.split(path.sep);
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currentPart = path.join(dir.treated, parts[0]);
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parts = parts.slice(1).join(path.sep);
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fs.exists(currentPart, function (exists) {
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if (exists) {
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return ensureDirectoryExists({ toTreat: parts, treated: currentPart }, callback);
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} else {
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return fs.mkdir(currentPart, '0777', function (err) {
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if (err) { return callback(err); }
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return ensureDirectoryExists({ toTreat: parts, treated: currentPart }, callback);
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});
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}
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});
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}
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/**
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* Return a random alphanumerical string of length len
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* There is a very small probability for the length to be less than len
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* (il the base64 conversion yields to many pluses and slashes) but
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* that's not an issue here
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*/
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function uid (len) {
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return crypto.randomBytes(Math.ceil(len * 5 / 4))
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.toString('base64')
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.replace(/[+\/]/g, '')
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.slice(0, len);
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}
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/**
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* Deep copy an DB object
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* TODO: Put in serialization/deserialization and tackle all cases
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*/
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function deepCopy (obj) {
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var res;
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if (typeof obj === 'boolean' || typeof obj === 'number' || typeof obj === 'string') {
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return obj;
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}
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if (typeof obj === 'object') {
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res = {};
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Object.keys(obj).forEach(function (k) {
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res[k] = deepCopy(obj[k]);
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});
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return res;
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}
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return undefined; // For now everything else is undefined. We should probably throw an error instead
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}
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module.exports.ensureDirectoryExists = ensureDirectoryExists;
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module.exports.uid = uid;
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module.exports.deepCopy = deepCopy;
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