add user signup through loopback

server/boot/a-extendUser.js

@@ -0,0 +1,84 @@
+var debug = require('debug')('freecc:extendUser');
+
+module.exports = function(app) {
+  var User = app.models.User;
+  debug('setting up user hooks');
+  // send verification email to new camper
+  User.afterRemote('create', function(ctx, user, next) {
+    debug('user created, sending email');
+    if (!user.email) { return next(); }
+
+    var mailOptions = {
+      type: 'email',
+      to: user.email,
+      from: 'Team@freecodecamp.com',
+      subject: 'Welcome to Free Code Camp!',
+      redirect: '/',
+      text: [
+        'Greetings from San Francisco!\n\n',
+        'Thank you for joining our community.\n',
+        'Feel free to email us at this address if you have ',
+        'any questions about Free Code Camp.\n',
+        'And if you have a moment, check out our blog: ',
+        'blog.freecodecamp.com.\n',
+        'Good luck with the challenges!\n\n',
+        '- the Free Code Camp Volunteer Team'
+      ].join('')
+    };
+    user.verify(mailOptions, function(err) {
+      if (err) { return next(err); }
+      debug('verification email sent');
+      ctx.req.flash({
+        msg: 'Please check your email and click on the verification link '
+          + 'before logging in.'
+      });
+      ctx.res.redirect('/');
+    });
+  });
+
+  User.doesExist = function doesExist(username, email, cb) {
+    debug('checking existence');
+    var where = {};
+    if (username) {
+      where.username = username;
+    } else {
+      where.email = email;
+    }
+    User.count(
+      { where: where },
+      function (err, count) {
+        if (err) { return cb(err); }
+        if (count > 0) {
+          return cb(null, true);
+        }
+        return cb(null, false);
+      }
+    );
+  };
+
+  User.remoteMethod(
+    'doesExist',
+    {
+      description: 'checks whether a user exists using email or username',
+      accepts: [
+        {
+          arg: 'username',
+          type: 'string'
+        },
+        {
+          arg: 'email',
+          type: 'string'
+        }
+      ],
+      returns: [
+        {
+          arg: 'exists',
+          type: 'boolean'
+        }
+      ],
+      http: {
+        path: '/exists'
+      }
+    }
+  );
+};