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23 lines
610 B
JavaScript
23 lines
610 B
JavaScript
const _ = require('lodash')
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const path = require('path')
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//
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// The advice in http://docs.aws.amazon.com/AmazonS3/latest/dev/
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// request-rate-perf-considerations.html is to avoid sequential key prefixes,
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// so we reverse the project ID part of the key as they suggest.
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//
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function format(projectId) {
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const prefix = naiveReverse(pad(projectId))
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return path.join(prefix.slice(0, 3), prefix.slice(3, 6), prefix.slice(6))
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}
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function pad(number) {
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return _.padStart(number, 9, '0')
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}
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function naiveReverse(string) {
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return string.split('').reverse().join('')
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}
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exports.format = format
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exports.pad = pad
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