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// Copyright (c) 2019 The Brave Authors. All rights reserved. | ||
// This Source Code Form is subject to the terms of the Mozilla Public | ||
// License, v. 2.0. If a copy of the MPL was not distributed with this file, | ||
// you can obtain one at http://mozilla.org/MPL/2.0/. | ||
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const crypto = require('crypto') | ||
const fs = require('fs') | ||
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module.exports = function CalculateFileChecksum(filePath, algorithm = 'sha256') { | ||
return new Promise((resolve, reject) => { | ||
try { | ||
const checksumGenerator = crypto.createHash(algorithm); | ||
const fileStream = fs.createReadStream(filePath) | ||
fileStream.on('error', function (err) { | ||
err.message = `CalculateFileChecksum error in FileStream at path "${filePath}": ${err.message}` | ||
reject(err) | ||
}) | ||
checksumGenerator.once('readable', function () { | ||
const checksum = checksumGenerator.read().toString('hex') | ||
resolve(checksum) | ||
}) | ||
fileStream.pipe(checksumGenerator) | ||
} catch (err) { | ||
err.message = `CalculateFileChecksum error using algorithm "${algorithm}" at path "${filePath}": ${err.message}` | ||
reject(err); | ||
} | ||
}); | ||
} |
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const path = require('path') | ||
const fs = require('fs-extra') | ||
const os = require('os') | ||
const calculateFileChecksum = require('./calculateFileChecksum') | ||
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const dirPrefixTmp = 'brave-browser-test-calculate-file-checksum-' | ||
const testFile1Name = 'file1' | ||
const testFile1InitialContent = 'this is a test' | ||
const encoding = 'utf8' | ||
let testDirPath, testFile1Path | ||
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beforeEach(async function () { | ||
// Test directory | ||
testDirPath = await fs.mkdtemp(path.join(os.tmpdir(), dirPrefixTmp)) | ||
// Initial test file | ||
testFile1Path = path.join(testDirPath, testFile1Name) | ||
await fs.writeFile(testFile1Path, testFile1InitialContent, encoding) | ||
}) | ||
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afterEach(async function () { | ||
// Remove test directory | ||
try { | ||
await fs.remove(testDirPath) | ||
} catch (err) { | ||
console.warn('Test cleanup: could not remove temp directory at ' + testDirPath) | ||
} | ||
}) | ||
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test('generates a checksum', async function () { | ||
const checksum1 = await calculateFileChecksum(testFile1Path) | ||
expect(checksum1).toBeTruthy() | ||
}) | ||
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test('checksum is stable', async function () { | ||
const checksum1 = await calculateFileChecksum(testFile1Path) | ||
const checksum2 = await calculateFileChecksum(testFile1Path) | ||
expect(checksum2).toBe(checksum1) | ||
}) | ||
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test('checksum changes when file contents change', async function () { | ||
const checksum1 = await calculateFileChecksum(testFile1Path) | ||
await fs.writeFile(testFile1Path, testFile1InitialContent + testFile1InitialContent, encoding) | ||
const checksum2 = await calculateFileChecksum(testFile1Path) | ||
expect(checksum2).not.toBe(checksum1) | ||
}) |
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