Elijah
724d70e58b
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39 lines
1.1 KiB
JavaScript
39 lines
1.1 KiB
JavaScript
import { createHash } from 'crypto'
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import * as fs from 'fs'
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import * as path from 'path'
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/**
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* Generate a fingerprint for a file which will be used the store the endpoint
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*
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* @param {File} file
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* @param {Object} options
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*/
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export default function fingerprint(file, options) {
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if (Buffer.isBuffer(file)) {
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// create MD5 hash for buffer type
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const blockSize = 64 * 1024 // 64kb
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const content = file.slice(0, Math.min(blockSize, file.length))
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const hash = createHash('md5').update(content).digest('hex')
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const ret = ['node-buffer', hash, file.length, options.endpoint].join('-')
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return Promise.resolve(ret)
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}
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if (file instanceof fs.ReadStream && file.path != null) {
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return new Promise((resolve, reject) => {
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const name = path.resolve(file.path)
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fs.stat(file.path, (err, info) => {
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if (err) {
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reject(err)
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return
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}
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const ret = ['node-file', name, info.size, info.mtime.getTime(), options.endpoint].join('-')
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resolve(ret)
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})
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})
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}
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// fingerprint cannot be computed for file input type
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return Promise.resolve(null)
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}
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