add email validation

config.js

@@ -40,7 +40,7 @@ var config = {
     },
   },
   // To use email notifications uncomment this:
-  email: {
+  emailOpts: {
     host: 'localhost',
     port: 25,
     ignoreTLS: true,

lib/emailservice.js

@@ -33,13 +33,13 @@ var EMAIL_TYPES = {
 function EmailService(opts) {
   $.checkArgument(opts);
 
-  opts.email = opts.email || {};
+  opts.emailOpts = opts.emailOpts || {};
 
   this.storage = opts.storage;
   this.lock = opts.lock;
-  this.mailer = opts.mailer || nodemailer.createTransport(opts.email);
-  this.subjectPrefix = opts.email.subjectPrefix || '[Wallet service]';
-  this.from = opts.email.from;
+  this.mailer = opts.mailer || nodemailer.createTransport(opts.emailOpts);
+  this.subjectPrefix = opts.emailOpts.subjectPrefix || '[Wallet service]';
+  this.from = opts.emailOpts.from;
 
   $.checkState(this.mailer);
   $.checkState(this.from);

lib/server.js

@@ -87,7 +87,7 @@ WalletService.initialize = function(opts, cb) {
       lock: lock,
       storage: storage,
       mailer: opts.mailer,
-      email: opts.email,
+      emailOpts: opts.emailOpts,
     });
     return cb();
   };
@@ -448,6 +448,12 @@ WalletService.prototype.savePreferences = function(opts, cb) {
 
   opts = opts || {};
 
+  if (opts.email) {
+    if (opts.email.length > 254 || opts.email.indexOf('@') == -1) {
+      return cb(new ClientError('Invalid email address'));
+    }
+  }
+
   self._runLocked(cb, function(cb) {
     var preferences = Model.Preferences.create({
       walletId: self.walletId,

test/integration/server.js

@@ -255,7 +255,7 @@ describe('Wallet service', function() {
         storage: storage,
         blockchainExplorer: blockchainExplorer,
         mailer: mailer,
-        email: {
+        emailOpts: {
           from: 'bws@dummy.net',
         }
       }, done);
@@ -779,6 +779,21 @@ describe('Wallet service', function() {
       });
     });
     it.skip('should save preferences only for requesting wallet', function(done) {});
+    it('should validate email address', function(done) {
+      server.savePreferences({
+        email: ' '
+      }, function(err) {
+        should.exist(err);
+        err.message.should.contain('email');
+        server.savePreferences({
+          email: 'dummy@' + _.repeat('domain', 50),
+        }, function(err) {
+          should.exist(err);
+          err.message.should.contain('email');
+          done();
+        });
+      });
+    });
   });
 
   describe('#getBalance', function() {