When signing up with 3rd party verified email, don't allow changing email in the signup form. Add ability to cancel signup form, which clears its state.

app/assets/javascripts/discourse/controllers/create_account_controller.js

@@ -18,6 +18,22 @@ Discourse.CreateAccountController = Discourse.Controller.extend(Discourse.ModalF
   rejectedPasswords: Em.A([]),
   prefilledUsername: null,
 
+  resetForm: function() {
+    this.setProperties({
+      accountName: '',
+      accountEmail: '',
+      accountUsername: '',
+      accountPassword: '',
+      authOptions: null,
+      globalNicknameExists: false,
+      complete: false,
+      formSubmitted: false,
+      rejectedEmails: Em.A([]),
+      rejectedPasswords: Em.A([]),
+      prefilledUsername: null
+    });
+  },
+
   submitDisabled: function() {
     if (this.get('formSubmitted')) return true;
     if (this.get('nameValidation.failed')) return true;
@@ -37,7 +53,6 @@ Discourse.CreateAccountController = Discourse.Controller.extend(Discourse.ModalF
 
   // Validate the name
   nameValidation: function() {
-
     // If blank, fail without a reason
     if (this.blank('accountName')) return Discourse.InputValidation.create({ failed: true });
 
@@ -101,6 +116,10 @@ Discourse.CreateAccountController = Discourse.Controller.extend(Discourse.ModalF
     });
   }.property('accountEmail', 'rejectedEmails.@each'),
 
+  emailValidated: function() {
+    return this.get('authOptions.email') === this.get("accountEmail") && this.get('authOptions.email_valid');
+  }.property('accountEmail', 'authOptions.email', 'authOptions.email_valid'),
+
   prefillUsername: function() {
     if (this.get('prefilledUsername')) {
       // If username field has been filled automatically, and email field just changed,

app/assets/javascripts/discourse/controllers/login_controller.js

@@ -12,6 +12,11 @@ Discourse.LoginController = Discourse.Controller.extend(Discourse.ModalFunctiona
   authenticate: null,
   loggingIn: false,
 
+  resetForm: function() {
+    this.set('authenticate', null);
+    this.set('loggingIn', false);
+  },
+
   site: function() {
     return Discourse.Site.current();
   }.property(),
@@ -89,6 +94,12 @@ Discourse.LoginController = Discourse.Controller.extend(Discourse.ModalFunctiona
         window.open(Discourse.getURL("/auth/" + name), "_blank",
             "menubar=no,status=no,height=" + height + ",width=" + width +  ",left=" + left + ",top=" + top);
       }
+    },
+
+    createAccount: function() {
+      var createAccountController = this.get('controllers.createAccount');
+      createAccountController.resetForm();
+      this.send('showCreateAccount');
     }
   },
 

app/assets/javascripts/discourse/routes/application_route.js

@@ -11,6 +11,7 @@ Discourse.ApplicationRoute = Em.Route.extend({
   actions: {
     showLogin: function() {
       Discourse.Route.showModal(this, 'login');
+      this.controllerFor('login').resetForm();
     },
 
     showCreateAccount: function() {

app/assets/javascripts/discourse/templates/modal/create_account.js.handlebars

@@ -18,7 +18,7 @@
       <tr class="input">
             <td><label for='new-account-email'>{{i18n user.email.title}}</label></td>
             <td>
-            {{input value=accountEmail id="new-account-email"}}
+            {{input value=accountEmail id="new-account-email" disabled=emailValidated}}
             &nbsp;{{inputTip validation=emailValidation}}
             </td>
       </tr>
@@ -70,6 +70,8 @@
     <button class='btn btn-large btn-primary' {{bindAttr disabled="submitDisabled"}} {{action createAccount}}>{{i18n create_account.title}}</button>
     {{#if formSubmitted}}
       &nbsp; <i class='fa fa-spinner fa-spin'></i>
+    {{else}}
+      &nbsp; <a {{action showLogin}}>{{i18n cancel}}</a>
     {{/if}}
   </div>
 {{/unless}}

app/assets/javascripts/discourse/templates/modal/login.js.handlebars

@@ -53,7 +53,7 @@
 
     {{#if showSignupLink}}
         {{i18n create_account.invite}}
-      <a id="new-account-link" {{action showCreateAccount}}>
+      <a id="new-account-link" {{action createAccount}}>
         {{i18n create_account.action}}
       </a>
     {{/if}}