Add zero-config self hosting on Render (#612)

* v1 of backend implementation for self hosting

* Add docs

* Add upgrades controller

* Add global helpers for self hosting mode

* Add self host settings controller

* Conditionally show self hosting settings

* Environment and config updates

* Complete upgrade prompting flow

* Update config for forked repo

* Move configuration of github provider within class

* Add upgrades cron

* Update deploy button

* Update guides

* Fix render deployer

* Typo

* Enable auto upgrades

* Fix cron

* Make upgrade modes more clear and consistent

* Trigger new available version

* Fix logic for displaying upgrade prompts

* Finish implementation

* Fix regression

* Trigger new version

* Add i18n translations

* trigger new version

* reduce caching time for testing

* Decrease cache for testing

* trigger upgrade

* trigger upgrade

* Only trigger deploy once

* trigger upgrade

* If target is commit, always upgrade if any upgrade is available

* trigger upgrade

* trigger upgrade

* Test release

* Change back to maybe repo for defaults

* Fix lint errors

* Clearer naming

* Fix relative link

* Add abs path

* Relative link

* Update docs

app/controllers/application_controller.rb

@@ -1,5 +1,5 @@
 class ApplicationController < ActionController::Base
-  include Authentication
+  include Authentication, Invitable, SelfHostable
   include Pagy::Backend
 
   before_action :sync_accounts
@@ -11,11 +11,6 @@ class ApplicationController < ActionController::Base
 
   private
 
-  def hosted_app?
-    ENV["HOSTED"] == "true"
-  end
-  helper_method :hosted_app?
-
   def sync_accounts
     return if Current.user.blank?
 

app/controllers/concerns/invitable.rb

@@ -0,0 +1,12 @@
+module Invitable
+  extend ActiveSupport::Concern
+
+  included do
+    helper_method :invite_code_required?
+  end
+
+  private
+    def invite_code_required?
+      ENV["REQUIRE_INVITE_CODE"] == "true"
+    end
+end

app/controllers/concerns/self_hostable.rb

@@ -0,0 +1,12 @@
+module SelfHostable
+  extend ActiveSupport::Concern
+
+  included do
+    helper_method :self_hosted?
+  end
+
+  private
+    def self_hosted?
+      ENV["SELF_HOSTING_ENABLED"] == "true"
+    end
+end

app/controllers/registrations_controller.rb

@@ -4,7 +4,7 @@ class RegistrationsController < ApplicationController
   layout "auth"
 
   before_action :set_user, only: :create
-  before_action :claim_invite_code, only: :create, if: :hosted_app?
+  before_action :claim_invite_code, only: :create, if: :invite_code_required?
 
   def new
     @user = User.new

app/controllers/settings/self_hosting_controller.rb

@@ -0,0 +1,46 @@
+class Settings::SelfHostingController < ApplicationController
+  before_action :verify_self_hosting_enabled
+
+  def edit
+  end
+
+  def update
+    if all_updates_valid?
+      self_hosting_params.keys.each do |key|
+        Setting.send("#{key}=", self_hosting_params[key].strip)
+      end
+
+      redirect_to edit_settings_self_hosting_path, notice: t(".success")
+    else
+      flash.now[:error] = @errors.first.message
+      render :edit, status: :unprocessable_entity
+    end
+  end
+
+  private
+    def all_updates_valid?
+      @errors = ActiveModel::Errors.new(Setting)
+      self_hosting_params.keys.each do |key|
+        setting = Setting.new(var: key)
+        setting.value = self_hosting_params[key].strip
+
+        unless setting.valid?
+          @errors.merge!(setting.errors)
+        end
+      end
+
+      if self_hosting_params[:upgrades_mode] == "auto" && self_hosting_params[:render_deploy_hook].blank?
+        @errors.add(:render_deploy_hook, t("settings.self_hosting.update.render_deploy_hook_error"))
+      end
+
+      @errors.empty?
+    end
+
+    def self_hosting_params
+      params.require(:setting).permit(:render_deploy_hook, :upgrades_mode, :upgrades_target)
+    end
+
+    def verify_self_hosting_enabled
+      head :not_found unless self_hosted?
+    end
+end

app/controllers/upgrades_controller.rb

@@ -0,0 +1,56 @@
+class UpgradesController < ApplicationController
+  before_action :verify_upgrades_enabled
+
+  def acknowledge
+    commit_sha = params[:id]
+    upgrade = Upgrader.find_upgrade(commit_sha)
+
+    if upgrade
+      if upgrade.available?
+        Current.user.acknowledge_upgrade_prompt(upgrade.commit_sha)
+        flash[:notice] = t(".upgrade_dismissed")
+      elsif upgrade.complete?
+        Current.user.acknowledge_upgrade_alert(upgrade.commit_sha)
+        flash[:notice] = t(".upgrade_complete_dismiss")
+      else
+        flash[:alert] = t(".upgrade_not_available")
+      end
+    else
+      flash[:alert] = t(".upgrade_not_found")
+    end
+
+    redirect_back(fallback_location: root_path)
+  end
+
+  def deploy
+    commit_sha = params[:id]
+    upgrade = Upgrader.find_upgrade(commit_sha)
+
+    unless upgrade
+      flash[:alert] = t(".upgrade_not_found")
+      return redirect_back(fallback_location: root_path)
+    end
+
+    prior_acknowledged_upgrade_commit_sha = Current.user.last_prompted_upgrade_commit_sha
+
+    # Optimistically acknowledge the upgrade prompt
+    Current.user.acknowledge_upgrade_prompt(upgrade.commit_sha)
+
+    upgrade_result = Upgrader.upgrade_to(upgrade)
+
+    if upgrade_result[:success]
+      flash[:notice] = upgrade_result[:message]
+    else
+      # If the upgrade fails, revert to the prior acknowledged upgrade
+      Current.user.acknowledge_upgrade_prompt(prior_acknowledged_upgrade_commit_sha)
+      flash[:alert] = upgrade_result[:message]
+    end
+
+    redirect_back(fallback_location: root_path)
+  end
+
+  private
+    def verify_upgrades_enabled
+      head :not_found unless ENV["UPGRADES_ENABLED"] == "true"
+    end
+end