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63 lines
1.5 KiB
63 lines
1.5 KiB
var crypto = require('crypto')
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var fs
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try {
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fs = require('graceful-fs')
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} catch (ex) {
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fs = require('fs')
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}
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try {
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process.binding('crypto')
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} catch (e) {
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var er = new Error( 'crypto binding not found.\n'
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+ 'Please build node with openssl.\n'
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+ e.message )
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throw er
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}
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exports.check = check
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exports.get = get
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function check(file, expected, options, cb) {
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if (typeof options === 'function') {
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cb = options;
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options = undefined;
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}
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expected = expected.toLowerCase().trim();
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get(file, options, function (er, actual) {
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if (er) {
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if (er.message) er.message += ' while getting shasum for ' + file;
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return cb(er)
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}
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if (actual === expected) return cb(null);
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cb(new Error(
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'shasum check failed for ' + file + '\n'
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+ 'Expected: ' + expected + '\n'
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+ 'Actual: ' + actual))
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})
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}
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function get(file, options, cb) {
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if (typeof options === 'function') {
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cb = options;
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options = undefined;
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}
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options = options || {};
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var algorithm = options.algorithm || 'sha1';
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var hash = crypto.createHash(algorithm)
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var source = fs.createReadStream(file)
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var errState = null
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source
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.on('error', function (er) {
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if (errState) return
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return cb(errState = er)
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})
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.on('data', function (chunk) {
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if (errState) return
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hash.update(chunk)
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})
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.on('end', function () {
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if (errState) return
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var actual = hash.digest("hex").toLowerCase().trim()
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cb(null, actual)
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})
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}
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