Elijah
724d70e58b
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36 lines
No EOL
1.1 KiB
JavaScript
36 lines
No EOL
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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var blockSize = 64 * 1024; // 64kb
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var content = file.slice(0, Math.min(blockSize, file.length));
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var hash = createHash('md5').update(content).digest('hex');
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var 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(function (resolve, reject) {
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var name = path.resolve(file.path);
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fs.stat(file.path, function (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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var 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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} |