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