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

closes #3381

4 files changed, 125 insertions, 0 deletions

diff --git a/node_modules/sha/.npmignore b/node_modules/sha/.npmignore
new file mode 100644
index 000000000..fcfd94494
--- /dev/null
+++ b/node_modules/sha/.npmignore
@@ -0,0 +1,4 @@
+node_modules
+test
+.gitignore
+.travis.yml
\ No newline at end of file
diff --git a/node_modules/sha/README.md b/node_modules/sha/README.md
new file mode 100644
index 000000000..9ac740731
--- /dev/null
+++ b/node_modules/sha/README.md
@@ -0,0 +1,32 @@
+# sha
+
+Check and get file hashes (using any algorithm)
+
+[![Build Status](https://travis-ci.org/ForbesLindesay/sha.png?branch=master)](https://travis-ci.org/ForbesLindesay/sha)
+[![Dependency Status](https://gemnasium.com/ForbesLindesay/sha.png)](https://gemnasium.com/ForbesLindesay/sha)
+
+## Installation
+
+    $ npm install sha
+
+## API
+
+### check(fileName, expected, [options,] cb)
+
+Asynchronously check that `fileName` has a "hash" of `expected`.  The callback will be called with either `null` or an error (indicating that they did not match).
+
+Options:
+
+- algorithm: defaults to `sha1` and can be any of the algorithms supported by `crypto.createHash`
+
+### get(fileName, [options,] cb)
+
+Asynchronously get the "hash" of `fileName`.  The callback will be called with an optional `error` object and the (lower cased) hex digest of the hash.
+
+Options:
+
+- algorithm: defaults to `sha1` and can be any of the algorithms supported by `crypto.createHash`
+
+## License
+
+BSD
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)
+    })
+}
diff --git a/node_modules/sha/package.json b/node_modules/sha/package.json
new file mode 100644
index 000000000..3b0e5822e
--- /dev/null
+++ b/node_modules/sha/package.json
@@ -0,0 +1,26 @@
+{
+  "name": "sha",
+  "version": "1.0.1",
+  "description": "Check and get file hashes",
+  "scripts": {
+    "test": "mocha -R list"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/ForbesLindesay/sha.git"
+  },
+  "license": "BSD",
+  "optionalDependencies": {
+    "graceful-fs": "1.2"
+  },
+  "devDependencies": {
+    "mocha": "~1.9.0"
+  },
+  "readme": "# sha\r\n\r\nCheck and get file hashes (using any algorithm)\r\n\r\n[![Build Status](https://travis-ci.org/ForbesLindesay/sha.png?branch=master)](https://travis-ci.org/ForbesLindesay/sha)\r\n[![Dependency Status](https://gemnasium.com/ForbesLindesay/sha.png)](https://gemnasium.com/ForbesLindesay/sha)\r\n\r\n## Installation\r\n\r\n    $ npm install sha\r\n\r\n## API\r\n\r\n### check(fileName, expected, [options,] cb)\r\n\r\nAsynchronously check that `fileName` has a \"hash\" of `expected`.  The callback will be called with either `null` or an error (indicating that they did not match).\r\n\r\nOptions:\r\n\r\n- algorithm: defaults to `sha1` and can be any of the algorithms supported by `crypto.createHash`\r\n\r\n### get(fileName, [options,] cb)\r\n\r\nAsynchronously get the \"hash\" of `fileName`.  The callback will be called with an optional `error` object and the (lower cased) hex digest of the hash.\r\n\r\nOptions:\r\n\r\n- algorithm: defaults to `sha1` and can be any of the algorithms supported by `crypto.createHash`\r\n\r\n## License\r\n\r\nBSD\r\n",
+  "readmeFilename": "README.md",
+  "_id": "sha@1.0.1",
+  "dependencies": {
+    "graceful-fs": "1.2"
+  },
+  "_from": "sha@~1.0.1"
+}