replace `./lib/utils/sha.js` with `sha`

closes #3381

1 files changed, 63 insertions, 0 deletions

diff --git a/node_modules/sha/index.js b/node_modules/sha/index.js
new file mode 100644
index 000000000..8e4e13683
--- /dev/null
+++ b/node_modules/sha/index.js
@@ -0,0 +1,63 @@
+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)
+    })
+}