closes #1175

public/language/en_GB/login.json

@@ -1,6 +1,6 @@
 {
 	"login": "Login",
-	"username": "Username",
+	"username": "Username / Email",
 	"password": "Password",
 	"remember_me": "Remember Me?",
 	"forgot_password": "Forgot Password?",

src/routes/authentication.js

@@ -134,8 +134,17 @@
 				}
 
 				app.post('/logout', logout);
-				app.post('/login', login);
 				app.post('/register', register);
+				app.post('/login', function(req, res, next) {
+					if (req.body.username && utils.isEmailValid(req.body.username)) {
+						user.getUsernameByEmail(req.body.username, function(err, username) {
+							req.body.username = username ? username : req.body.username;
+							login(req, res, next);
+						});
+					} else {
+						login(req, res, next);
+					}
+				});
 			});
 		});
 	};

src/user.js

@@ -412,6 +412,12 @@ var bcrypt = require('bcryptjs'),
 		db.getObjectField('email:uid', email, callback);
 	};
 
+	User.getUsernameByEmail = function(email, callback) {
+		db.getObjectField('email:uid', email, function(err, uid) {
+			User.getUserField(uid, 'username', callback);
+		});
+	};
+
 	User.isModerator = function(uid, cid, callback) {
 		groups.isMemberByGroupName(uid, 'cid:' + cid + ':privileges:mods', callback);
 	};