From 7aa4d505604e3ce96968d533a727a5e8696ef347 Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Thu, 16 Jul 2015 14:08:52 +0100
Subject: [PATCH 1/2] Handle registration errors.

---
 skins/base/views/templates/Register.js |  9 +++++++
 src/controllers/templates/Register.js  | 37 ++++++++++++++++++--------
 2 files changed, 35 insertions(+), 11 deletions(-)

diff --git a/skins/base/views/templates/Register.js b/skins/base/views/templates/Register.js
index 2a61fa2e..13b9b2a1 100644
--- a/skins/base/views/templates/Register.js
+++ b/skins/base/views/templates/Register.js
@@ -104,6 +104,15 @@ module.exports = React.createClass({
                 case this.FieldErrors.PasswordMismatch:
                     strings.push("Passwords don't match");
                     break;
+                case this.FieldErrors.Missing:
+                    strings.push("Missing "+keys[i]);
+                    break;
+                case this.FieldErrors.TooShort:
+                    strings.push(keys[i]+" is too short");
+                    break;
+                case this.FieldErrors.InUse:
+                    strings.push(keys[i]+" is already taken");
+                    break;
             }
         }
         var errtxt = strings.join(', ');
diff --git a/src/controllers/templates/Register.js b/src/controllers/templates/Register.js
index 4ad66d9f..2ff75e0c 100644
--- a/src/controllers/templates/Register.js
+++ b/src/controllers/templates/Register.js
@@ -27,7 +27,9 @@ var ComponentBroker = require("../../ComponentBroker");
 module.exports = {
     FieldErrors: {
         PasswordMismatch: 'PasswordMismatch',
-        PasswordLength: 'PasswordLength'
+        TooShort: 'TooShort',
+        Missing: 'Missing',
+        InUse: 'InUse'
     },
 
     getInitialState: function() {
@@ -166,10 +168,18 @@ module.exports = {
         if (formVals.password != formVals.confirmPassword) {
             badFields.confirmPassword = this.FieldErrors.PasswordMismatch;
         }
-        if (formVals.password.length < 6) {
-            badFields.password = this.FieldErrors.PasswordLength;
+        if (formVals.password == '') {
+            badFields.password = this.FieldErrors.Missing;
+        } else if (formVals.password.length < 6) {
+            badFields.password = this.FieldErrors.Length;
+        }
+        if (formVals.username == '') {
+            badFields.username = this.FieldErrors.Missing;
+        }
+        if (Object.keys(badFields).length > 0) {
+            this.onBadFields(badFields);
+            return;
         }
-        this.onBadFields(badFields);
 
         MatrixClientPeg.replaceUsingUrls(
             this.getHsUrl(),
@@ -308,15 +318,20 @@ module.exports = {
                 });
                 self.startStage(flow.stages[flowStage]);
             } else {
-                var errorText = "Unable to contact the given Home Server";
-                if (error.httpStatus == 401) {
-                    errorText = "Authorisation failed!";
-                }
                 self.setStep("initial");
-                self.setState({
+                var newState = {
                     busy: false,
-                    errorText: errorText
-                });
+                    errorText: "Unable to contact the given Home Server"
+                };
+                if (error.name == 'M_USER_IN_USE') {
+                    delete newState.errorText;
+                    self.onBadFields({
+                        username: self.FieldErrors.InUse
+                    });
+                } else if (error.httpStatus == 401) {
+                    newState.errorText = "Authorisation failed!";
+                }
+                self.setState(newState);
             }
         });
     },

From a6df6ca29b135e266612fa014ba7c08e728176cf Mon Sep 17 00:00:00 2001
From: David Baker <dave@matrix.org>
Date: Thu, 16 Jul 2015 14:19:13 +0100
Subject: [PATCH 2/2] Don't forget form values on error

---
 skins/base/views/templates/Register.js | 8 ++++----
 src/controllers/templates/Register.js  | 7 +++++++
 2 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/skins/base/views/templates/Register.js b/skins/base/views/templates/Register.js
index 13b9b2a1..94f3b969 100644
--- a/skins/base/views/templates/Register.js
+++ b/skins/base/views/templates/Register.js
@@ -53,10 +53,10 @@ module.exports = React.createClass({
                 return (
                     <div>
                         <form onSubmit={this.onInitialStageSubmit}>
-                        Email: <input type="text" ref="email" /><br />
-                        Username: <input type="text" ref="username" /><br />
-                        Password: <input type="password" ref="password" /><br />
-                        Confirm Password: <input type="password" ref="confirmPassword" /><br />
+                        Email: <input type="text" ref="email" defaultValue={this.savedParams.email} /><br />
+                        Username: <input type="text" ref="username" defaultValue={this.savedParams.username} /><br />
+                        Password: <input type="password" ref="password" defaultValue={this.savedParams.password} /><br />
+                        Confirm Password: <input type="password" ref="confirmPassword" defaultValue={this.savedParams.confirmPassword} /><br />
                         <ServerConfig ref="serverConfig" />
                         <input type="submit" value="Continue" />
                         </form>
diff --git a/src/controllers/templates/Register.js b/src/controllers/templates/Register.js
index 2ff75e0c..664b36b3 100644
--- a/src/controllers/templates/Register.js
+++ b/src/controllers/templates/Register.js
@@ -42,6 +42,12 @@ module.exports = {
     },
 
     componentWillMount: function() {
+        this.savedParams = {
+            email: '',
+            username: '',
+            password: '',
+            confirmPassword: ''
+        };
         this.readNewProps();
     },
 
@@ -163,6 +169,7 @@ module.exports = {
         ev.preventDefault();
 
         var formVals = this.getRegFormVals();
+        this.savedParams = formVals;
 
         var badFields = {};
         if (formVals.password != formVals.confirmPassword) {