GoogleOauth2.0 First implementation

First try for GoogleOauth2.0

express-server/node_modules/uid2/index.js

@@ -0,0 +1,55 @@
+/**
+ * Module dependencies
+ */
+
+var crypto = require('crypto');
+
+/**
+ * 62 characters in the ascii range that can be used in URLs without special
+ * encoding.
+ */
+var UIDCHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
+
+/**
+ * Make a Buffer into a string ready for use in URLs
+ *
+ * @param {String}
+ * @returns {String}
+ * @api private
+ */
+function tostr(bytes) {
+  var chars, r, i;
+
+  r = [];
+  for (i = 0; i < bytes.length; i++) {
+    r.push(UIDCHARS[bytes[i] % UIDCHARS.length]);
+  }
+
+  return r.join('');
+}
+
+/**
+ * Generate an Unique Id
+ *
+ * @param {Number} length  The number of chars of the uid
+ * @param {Number} cb (optional)  Callback for async uid generation
+ * @api public
+ */
+
+function uid(length, cb) {
+
+  if (typeof cb === 'undefined') {
+    return tostr(crypto.pseudoRandomBytes(length));
+  } else {
+    crypto.pseudoRandomBytes(length, function(err, bytes) {
+       if (err) return cb(err);
+       cb(null, tostr(bytes));
+    })
+  }
+}
+
+/**
+ * Exports
+ */
+
+module.exports = uid;