Clean up about page (#1282)

* Add InstancePresenter to expose site details

* Clean up about controller, use instance presenter

8 files changed, 175 insertions, 55 deletions

diff --git a/app/controllers/about_controller.rb b/app/controllers/about_controller.rb
index 7fd43489f..04e7ddacf 100644
--- a/app/controllers/about_controller.rb
+++ b/app/controllers/about_controller.rb
@@ -2,30 +2,25 @@
 
 class AboutController < ApplicationController
   before_action :set_body_classes
+  before_action :set_instance_presenter, only: [:show, :more]
 
-  def index
-    @description                  = Setting.site_description
-    @open_registrations           = Setting.open_registrations
-    @closed_registrations_message = Setting.closed_registrations_message
+  def show; end
 
-    @user = User.new
-    @user.build_account
-  end
-
-  def more
-    @description          = Setting.site_description
-    @extended_description = Setting.site_extended_description
-    @contact_account      = Account.find_local(Setting.site_contact_username)
-    @contact_email        = Setting.site_contact_email
-    @user_count           = Rails.cache.fetch('user_count')            { User.count }
-    @status_count         = Rails.cache.fetch('local_status_count')    { Status.local.count }
-    @domain_count         = Rails.cache.fetch('distinct_domain_count') { Account.distinct.count(:domain) }
-  end
+  def more; end
 
   def terms; end
 
   private
 
+  def new_user
+    User.new.tap(&:build_account)
+  end
+  helper_method :new_user
+
+  def set_instance_presenter
+    @instance_presenter = InstancePresenter.new
+  end
+
   def set_body_classes
     @body_classes = 'about-body'
   end
diff --git a/app/presenters/instance_presenter.rb b/app/presenters/instance_presenter.rb
new file mode 100644
index 000000000..cd809566f
--- /dev/null
+++ b/app/presenters/instance_presenter.rb
@@ -0,0 +1,28 @@
+# frozen_string_literal: true
+
+class InstancePresenter
+  delegate(
+    :closed_registrations_message,
+    :contact_email,
+    :open_registrations,
+    :site_description,
+    :site_extended_description,
+    to: Setting
+  )
+
+  def contact_account
+    Account.find_local(Setting.site_contact_username)
+  end
+
+  def user_count
+    Rails.cache.fetch('user_count') { User.count }
+  end
+
+  def status_count
+    Rails.cache.fetch('local_status_count') { Status.local.count }
+  end
+
+  def domain_count
+    Rails.cache.fetch('distinct_domain_count') { Account.distinct.count(:domain) }
+  end
+end
diff --git a/app/views/about/_registration.html.haml b/app/views/about/_registration.html.haml
new file mode 100644
index 000000000..c7a9a488b
--- /dev/null
+++ b/app/views/about/_registration.html.haml
@@ -0,0 +1,30 @@
+= simple_form_for(new_user, url: user_registration_path) do |f|
+  = f.simple_fields_for :account do |account_fields|
+    = account_fields.input :username,
+      autofocus: true,
+      placeholder: t('simple_form.labels.defaults.username'),
+      required: true,
+      input_html: { 'aria-label' => t('simple_form.labels.defaults.username') }
+
+  = f.input :email,
+    placeholder: t('simple_form.labels.defaults.email'),
+    required: true,
+    input_html: { 'aria-label' => t('simple_form.labels.defaults.email') }
+  = f.input :password,
+    autocomplete: "off",
+    placeholder: t('simple_form.labels.defaults.password'),
+    required: true,
+    input_html: { 'aria-label' => t('simple_form.labels.defaults.password') }
+  = f.input :password_confirmation,
+    autocomplete: "off",
+    placeholder: t('simple_form.labels.defaults.confirm_password'),
+    required: true,
+    input_html: { 'aria-label' => t('simple_form.labels.defaults.confirm_password') }
+
+  .actions
+    = f.button :button, t('about.get_started'), type: :submit
+
+  .info
+    = link_to t('auth.login'), new_user_session_path, class: 'webapp-btn'
+    ·
+    = link_to t('about.about_this'), about_more_path
diff --git a/app/views/about/more.html.haml b/app/views/about/more.html.haml
index 2de3bf986..8c12f57c1 100644
--- a/app/views/about/more.html.haml
+++ b/app/views/about/more.html.haml
@@ -7,42 +7,42 @@
       .panel
         %h2= Rails.configuration.x.local_domain
 
-        - unless @description.blank?
-          %p= @description.html_safe
+        - unless @instance_presenter.site_description.blank?
+          %p= @instance_presenter.site_description.html_safe
 
       .information-board
         .section
           %span= t 'about.user_count_before'
-          %strong= number_with_delimiter @user_count
+          %strong= number_with_delimiter @instance_presenter.user_count
           %span= t 'about.user_count_after'
         .section
           %span= t 'about.status_count_before'
-          %strong= number_with_delimiter @status_count
+          %strong= number_with_delimiter @instance_presenter.status_count
           %span= t 'about.status_count_after'
         .section
           %span= t 'about.domain_count_before'
-          %strong= number_with_delimiter @domain_count
+          %strong= number_with_delimiter @instance_presenter.domain_count
           %span= t 'about.domain_count_after'
 
-      - unless @extended_description.blank?
-        .panel= @extended_description.html_safe
+      - unless @instance_presenter.site_extended_description.blank?
+        .panel= @instance_presenter.site_extended_description.html_safe
 
     .sidebar
       .panel
         .panel-header= t 'about.contact'
         .panel-body
-          - if @contact_account
+          - if @instance_presenter.contact_account
             .owner
-              .avatar= image_tag @contact_account.avatar.url
+              .avatar= image_tag @instance_presenter.contact_account.avatar.url
               .name
-                = link_to TagManager.instance.url_for(@contact_account) do
-                  %span.display_name.emojify= display_name(@contact_account)
-                  %span.username= "@#{@contact_account.acct}"
+                = link_to TagManager.instance.url_for(@instance_presenter.contact_account) do
+                  %span.display_name.emojify= display_name(@instance_presenter.contact_account)
+                  %span.username= "@#{@instance_presenter.contact_account.acct}"
 
-          - unless @contact_email.blank?
+          - unless @instance_presenter.contact_email.blank?
             .contact-email
               = t 'about.business_email'
-              %strong= @contact_email
+              %strong= @instance_presenter.contact_email
       .panel
         .panel-header= t 'about.links'
         .panel-list
diff --git a/app/views/about/index.html.haml b/app/views/about/show.html.haml
index f6b0c1668..8a0d00daa 100644
--- a/app/views/about/index.html.haml
+++ b/app/views/about/show.html.haml
@@ -8,7 +8,7 @@
   %meta{ property: 'og:site_name', content: site_title }/
   %meta{ property: 'og:type', content: 'website' }/
   %meta{ property: 'og:title', content: Rails.configuration.x.local_domain }/
-  %meta{ property: 'og:description', content: @description.blank? ? "Mastodon is a free, open-source social network server. A decentralized alternative to commercial platforms, it avoids the risks of a single company monopolizing your communication. Anyone can run Mastodon and participate in the social network seamlessly" : strip_tags(@description) }/
+  %meta{ property: 'og:description', content: strip_tags(@instance_presenter.site_description.blank? ? t('about.about_mastodon') : @instance_presenter.site_description) }/
   %meta{ property: 'og:image', content: asset_url('mastodon_small.jpg') }/
   %meta{ property: 'og:image:width', content: '400' }/
   %meta{ property: 'og:image:height', content: '400' }/
@@ -24,28 +24,14 @@
   .screenshot-with-signup
     .mascot= image_tag 'fluffy-elephant-friend.png'
 
-    - if @open_registrations
-      = simple_form_for(@user, url: user_registration_path) do |f|
-        = f.simple_fields_for :account do |ff|
-          = ff.input :username, autofocus: true, placeholder: t('simple_form.labels.defaults.username'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.username') }
-
-        = f.input :email, placeholder: t('simple_form.labels.defaults.email'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.email') }
-        = f.input :password, autocomplete: "off", placeholder: t('simple_form.labels.defaults.password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.password') }
-        = f.input :password_confirmation, autocomplete: "off", placeholder: t('simple_form.labels.defaults.confirm_password'), required: true, input_html: { 'aria-label' => t('simple_form.labels.defaults.confirm_password') }
-
-        .actions
-          = f.button :button, t('about.get_started'), type: :submit
-
-        .info
-          = link_to t('auth.login'), new_user_session_path, class: 'webapp-btn'
-          ·
-          = link_to t('about.about_this'), about_more_path
+    - if @instance_presenter.open_registrations
+      = render 'registration'
     - else
       .closed-registrations-message
-        - if @closed_registrations_message.blank?
+        - if @instance_presenter.closed_registrations_message.blank?
           %p= t('about.closed_registrations')
         - else
-          = @closed_registrations_message.html_safe
+          = @instance_presenter.closed_registrations_message.html_safe
         .info
           = link_to t('auth.login'), new_user_session_path, class: 'webapp-btn'
           ·
@@ -85,9 +71,9 @@
           = fa_icon('li check-square')
           = t 'about.features.api'
 
-  - unless @description.blank?
+  - unless @instance_presenter.site_description.blank?
     %h3= t('about.description_headline', domain: Rails.configuration.x.local_domain)
-    %p= @description.html_safe
+    %p= @instance_presenter.site_description.html_safe
 
   .actions
     .info
diff --git a/config/routes.rb b/config/routes.rb
index 66b0ed830..b0a13aa78 100644
--- a/config/routes.rb
+++ b/config/routes.rb
@@ -188,7 +188,7 @@ Rails.application.routes.draw do
 
   get '/web/(*any)', to: 'home#index', as: :web
 
-  get '/about',      to: 'about#index'
+  get '/about',      to: 'about#show'
   get '/about/more', to: 'about#more'
   get '/terms',      to: 'about#terms'
 
diff --git a/spec/controllers/about_controller_spec.rb b/spec/controllers/about_controller_spec.rb
index 4282649e1..f49de9622 100644
--- a/spec/controllers/about_controller_spec.rb
+++ b/spec/controllers/about_controller_spec.rb
@@ -3,9 +3,16 @@ require 'rails_helper'
 RSpec.describe AboutController, type: :controller do
   render_views
 
-  describe 'GET #index' do
+  describe 'GET #show' do
     it 'returns http success' do
-      get :index
+      get :show
+      expect(response).to have_http_status(:success)
+    end
+  end
+
+  describe 'GET #more' do
+    it 'returns http success' do
+      get :more
       expect(response).to have_http_status(:success)
     end
   end
diff --git a/spec/presenters/instance_presenter_spec.rb b/spec/presenters/instance_presenter_spec.rb
new file mode 100644
index 000000000..0f318d9c3
--- /dev/null
+++ b/spec/presenters/instance_presenter_spec.rb
@@ -0,0 +1,74 @@
+require 'rails_helper'
+
+describe InstancePresenter do
+  let(:instance_presenter) { InstancePresenter.new }
+
+  it "delegates site_description to Setting" do
+    Setting.site_description = "Site desc"
+
+    expect(instance_presenter.site_description).to eq "Site desc"
+  end
+
+  it "delegates site_extended_description to Setting" do
+    Setting.site_extended_description = "Extended desc"
+
+    expect(instance_presenter.site_extended_description).to eq "Extended desc"
+  end
+
+  it "delegates open_registrations to Setting" do
+    Setting.open_registrations = false
+
+    expect(instance_presenter.open_registrations).to eq false
+  end
+
+  it "delegates closed_registrations_message to Setting" do
+    Setting.closed_registrations_message = "Closed message"
+
+    expect(instance_presenter.closed_registrations_message).to eq "Closed message"
+  end
+
+  it "delegates contact_email to Setting" do
+    Setting.contact_email = "admin@example.com"
+
+    expect(instance_presenter.contact_email).to eq "admin@example.com"
+  end
+
+  describe "contact_account" do
+    it "returns the account for the site contact username" do
+      Setting.site_contact_username = "aaa"
+      account = Fabricate(:account, username: "aaa")
+
+      expect(instance_presenter.contact_account).to eq(account)
+    end
+  end
+
+  describe "user_count" do
+    it "returns the number of site users" do
+      cache = double
+      allow(Rails).to receive(:cache).and_return(cache)
+      allow(cache).to receive(:fetch).with("user_count").and_return(123)
+
+      expect(instance_presenter.user_count).to eq(123)
+    end
+  end
+
+  describe "status_count" do
+    it "returns the number of local statuses" do
+      cache = double
+      allow(Rails).to receive(:cache).and_return(cache)
+      allow(cache).to receive(:fetch).with("local_status_count").and_return(234)
+
+      expect(instance_presenter.status_count).to eq(234)
+    end
+  end
+
+  describe "domain_count" do
+    it "returns the number of known domains" do
+      cache = double
+      allow(Rails).to receive(:cache).and_return(cache)
+      allow(cache).to receive(:fetch).with("distinct_domain_count").and_return(345)
+
+      expect(instance_presenter.domain_count).to eq(345)
+    end
+  end
+end