Pre-fill the invite-email on signin/register pages

app/controllers/invites_controller.rb

@@ -75,7 +75,7 @@ class InvitesController < ApplicationController
     notice = notice.join(' ') + "."
 
     store_location_for :user, request.fullpath
-    redirect_to new_user_session_path, notice: notice
+    redirect_to new_user_session_path(invite_email: member.invite_email), notice: notice
   end
 
   def invite_details

app/controllers/sessions_controller.rb

@@ -25,6 +25,7 @@ class SessionsController < Devise::SessionsController
   before_action :store_unauthenticated_sessions, only: [:new]
   before_action :save_failed_login, if: :action_new_and_failed_login?
   before_action :load_recaptcha
+  before_action :set_invite_params, only: [:new]
 
   after_action :log_failed_login, if: :action_new_and_failed_login?
   after_action :verify_known_sign_in, only: [:create]
@@ -291,6 +292,10 @@ class SessionsController < Devise::SessionsController
       "standard"
     end
   end
+
+  def set_invite_params
+    @invite_email = ActionController::Base.helpers.sanitize(params[:invite_email])
+  end
 end
 
 SessionsController.prepend_if_ee('EE::SessionsController')

app/views/devise/sessions/_new_base.html.haml

 = form_for(resource, as: resource_name, url: session_path(resource_name), html: { class: 'new_user gl-show-field-errors', 'aria-live' => 'assertive'}) do |f|
   .form-group
     = f.label _('Username or email'), for: 'user_login', class: 'label-bold'
-    = f.text_field :login, class: 'form-control top', autofocus: 'autofocus', autocapitalize: 'off', autocorrect: 'off', required: true, title: _('This field is required.'), data: { qa_selector: 'login_field' }
+    = f.text_field :login, value: @invite_email, class: 'form-control top', autofocus: 'autofocus', autocapitalize: 'off', autocorrect: 'off', required: true, title: _('This field is required.'), data: { qa_selector: 'login_field' }
   .form-group
     = f.label :password, class: 'label-bold'
     = f.password_field :password, class: 'form-control bottom', required: true, title: _('This field is required.'), data: { qa_selector: 'password_field' }

app/views/devise/shared/_signup_box.html.haml

@@ -19,7 +19,7 @@
         %p.validation-pending.gl-field-error-ignore.field-validation.hide= _('Checking username availability...')
       .form-group
         = f.label :email, class: 'label-bold'
-        = f.email_field :email, class: "form-control middle", data: { qa_selector: 'new_user_email_field' }, required: true, title: _("Please provide a valid email address.")
+        = f.email_field :email, value: @invite_email, class: "form-control middle", data: { qa_selector: 'new_user_email_field' }, required: true, title: _("Please provide a valid email address.")
       .form-group
         = f.label :email_confirmation, class: 'label-bold'
         = f.email_field :email_confirmation, class: "form-control middle", data: { qa_selector: 'new_user_email_confirmation_field' }, required: true, title: _("Please retype the email address.")

changelogs/unreleased/214100-pre-fill-the-email-input-on-sign-in-sign-up-pages.yml

+---
+title: Pre-fill the email input on sign-in / sign up pages
+merge_request: 33851
+author:
+type: changed

spec/features/invites_spec.rb

@@ -48,6 +48,14 @@ RSpec.describe 'Invites', :aggregate_failures do
       expect(page).to have_content('To accept this invitation, sign in')
     end
 
+    it 'pre-fills the "Username or email" field on the sign in box with the invite_email from the invite' do
+      expect(find_field('Username or email').value).to eq(group_invite.invite_email)
+    end
+
+    it 'pre-fills the Email field on the sign up box  with the invite_email from the invite' do
+      expect(find_field('Email').value).to eq(group_invite.invite_email)
+    end
+
     it 'sign in, grants access and redirects to group page' do
       fill_in_sign_in_form(user)