Prompt twice when setting password

Fixes #364

boot/boot.js

@@ -477,6 +477,7 @@ submitText: text to use for submit button (defaults to "Login")
 serviceName: text of the human readable service name
 noUserName: set true to disable username prompt
 canCancel: set true to enable a cancel button (callback called with null)
+repeatPassword: set true to prompt for the password twice
 callback: function to be called on submission with parameter of object {username:,password:}. Callback must return `true` to remove the password prompt
 */
 $tw.utils.PasswordPrompt.prototype.createPrompt = function(options) {
@@ -493,6 +494,11 @@ $tw.utils.PasswordPrompt.prototype.createPrompt = function(options) {
 	children.push(dm("input",{
 		attributes: {type: "password", name: "password", placeholder: "Password"}
 	}));
+	if(options.repeatPassword) {
+		children.push(dm("input",{
+			attributes: {type: "password", name: "password2", placeholder: "Repeat password"}
+		}));
+	}
 	if(options.canCancel) {
 		children.push(dm("button",{
 			text: "Cancel",
@@ -527,18 +533,23 @@ $tw.utils.PasswordPrompt.prototype.createPrompt = function(options) {
 				data[element.name] = element.value;
 			}
 		});
-		// Call the callback
-		if(options.callback(data)) {
-			// Remove the prompt if the callback returned true
-			self.removePrompt(promptInfo);
+		// Check that the passwords match
+		if(options.repeatPassword && data.password !== data.password2) {
+			alert("Passwords do not match");
 		} else {
-			// Clear the password if the callback returned false
-			$tw.utils.each(form.elements,function(element) {
-				if(element.name === "password") {
-					element.value = "";
-				}
-			});
-		}
+			// Call the callback
+			if(options.callback(data)) {
+				// Remove the prompt if the callback returned true
+				self.removePrompt(promptInfo);
+			} else {
+				// Clear the password if the callback returned false
+				$tw.utils.each(form.elements,function(element) {
+					if(element.name === "password" || element.name === "password2") {
+						element.value = "";
+					}
+				});
+			}
+		} 
 		event.preventDefault();
 		return false;
 	},true);

core/modules/startup/password.js

@@ -25,6 +25,7 @@ exports.startup = function() {
 			noUserName: true,
 			submitText: "Set password",
 			canCancel: true,
+			repeatPassword: true,
 			callback: function(data) {
 				if(data) {
 					$tw.crypto.setPassword(data.password);