39 lines
749 B
JavaScript
39 lines
749 B
JavaScript
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'use strict';
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const crypto = require('crypto'),
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stream = require('stream'),
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TransformStream = stream.Transform;
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class HashStream extends TransformStream {
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#hasher;
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#digest;
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#size;
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constructor() {
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super();
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this.#hasher = crypto.createHash('sha256');
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this.#digest = null;
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this.#size = 0;
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}
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digest() {
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return this.#digest;
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}
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size() {
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return this.#size;
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}
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_transform(chunk, encoding, callback) {
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this.#hasher.update(chunk);
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this.#size += chunk.length;
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callback(null, chunk);
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}
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_flush(callback) {
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this.#digest = this.#hasher.digest('hex');
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callback(null);
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}
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}
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exports = module.exports = HashStream;
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