Create SignUp component

src/api/app/components/sign_up_component.html.haml

@@ -0,0 +1,29 @@
+- if proxy_auth_enabled?
+  - if proxy_auth_register_page.blank?
+    %p Sorry, signing up is currently disabled
+  - else
+    %p= link_to 'Use this link to Sign Up', proxy_auth_register_page
+- else
+  = form_tag(users_path, method: :post, class: 'sign-up', autocomplete: 'off') do
+    .form-group
+      = label_tag 'login', 'Username:'
+      %abbr.text-danger{ title: 'required' } *
+      = text_field_tag 'login', nil, placeholder: 'Username', autocomplete: 'off', class: 'form-control', required: true
+    .form-group
+      = label_tag 'email', 'Email:'
+      %abbr.text-danger{ title: 'required' } *
+      = text_field_tag 'email', nil, placeholder: 'Email address', autocomplete: 'off', class: 'form-control', type: 'email', required: true
+    .form-group
+      = label_tag 'password', 'Password:'
+      %abbr.text-danger{ title: 'required' } *
+      = password_field_tag :password, nil, id: 'pwd', placeholder: 'Enter a password', autocomplete: 'off', class: 'form-control', required: true
+    .form-group
+      = label_tag 'password_confirmation', 'Password confirmation:'
+      %abbr.text-danger{ title: 'required' } *
+      = password_field_tag(:password_confirmation, nil, id: 'pwd_confirmation', placeholder: 'Password confirmation', autocomplete: 'off',
+        class: 'form-control', required: true)
+    = hidden_field_tag 'register', 'true'
+    = submit_tag submit_btn_text, class: 'btn btn-primary'
+    - unless User.session
+      or
+      = link_to('Log In', new_session_path)

src/api/app/components/sign_up_component.rb

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+# frozen_string_literal: true
+
+class SignUpComponent < ApplicationComponent
+  attr_accessor :submit_btn_text
+
+  def initialize(submit_btn_text: 'Sign Up', create_page: false, config: CONFIG)
+    super
+
+    @config = config
+    @submit_btn_text = sanitize(create_page ? 'Create' : submit_btn_text)
+  end
+
+  def proxy_auth_enabled?
+    @config['proxy_auth_mode'] == :on
+  end
+
+  def proxy_auth_register_page
+    @config['proxy_auth_register_page']
+  end
+end

src/api/spec/components/sign_up_component_spec.rb

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+require 'rails_helper'
+
+RSpec.describe SignUpComponent, type: :component do
+  context 'signing up disabled' do
+    let(:config) { { 'proxy_auth_mode' => :on } }
+
+    it do
+      expect(render_inline(described_class.new(config: config)).to_html).to have_text('signing up is currently disabled')
+    end
+
+    context 'there is a proxy auth register page' do
+      let(:config) { { 'proxy_auth_mode' => :on, 'proxy_auth_register_page' => 'http://foo.org' } }
+
+      it do
+        expect(render_inline(described_class.new(config: config)).to_html).to have_text('Use this link to Sign Up')
+      end
+    end
+  end
+end