lib/zuora_connect/controllers/helpers.rb



require 'apartment/migrator'
module ZuoraConnect
  module Controllers
    module Helpers
      extend ActiveSupport::Concern

      def authenticate_app_api_request
        #Skip session for api requests
        Thread.current[:appinstance] = nil
        request.session_options[:skip] = true
        ElasticAPM.set_tag(:trace_id, request.uuid) if defined?(ElasticAPM) && ElasticAPM.running?

        start_time = Time.now
        if request.headers["API-Token"].present?
          @appinstance = ZuoraConnect::AppInstance.where(:api_token => request.headers["API-Token"]).first
          ZuoraConnect.logger.debug("[#{@appinstance.id}] API REQUEST - API token") if @appinstance.present?
          check_instance
        elsif ZuoraConnect::AppInstance::INTERNAL_HOSTS.include?(request.headers.fetch("HOST", nil))
          zuora_host, zuora_entity_id, zuora_instance_id = [request.headers['zuora-host'], (request.headers['zuora-entity-ids'] || "").gsub('-',''), request.headers['zuora-instance-id']]

          #Validate host present
          if zuora_host.blank?
            render json: {"status": 401, "message": "zuora-host header was not supplied."}, status: :unauthorized
            return
          end
          #Validate entity-ids present
          if zuora_entity_id.blank?
            render json: {"status": 401, "message": "zuora-entity-ids header was not supplied."}, status: :unauthorized
            return
          end
          #Select with instance id if present. Used where mulitple deployments are done.
          if zuora_instance_id.present?
            appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host AND id = :id", entities: [zuora_entity_id], host: zuora_host, id: zuora_instance_id)
          else
            appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host", entities: [zuora_entity_id], host: zuora_host)
          end

          if appinstances.size == 0
            render json: {"status": 401, "message": "Missing mapping or no deployment for '#{zuora_host}-#{zuora_entity_id}' ."}, status: :unauthorized
            return
          elsif appinstances.size > 1
            render json: {"status": 401, "message": "More than one app instance binded to host and entity ids. Please indicate correct instance via 'zuora-instance-id' header"}, status: :unauthorized
            return
          else
            @appinstance = appinstances.first
            check_instance
          end
      
        elsif request.headers.fetch("Authorization", "").include?("Basic ")
          authenticate_or_request_with_http_basic do |username, password|
            @appinstance = ZuoraConnect::AppInstance.where(:token => password).first
            @appinstance ||= ZuoraConnect::AppInstance.where(:api_token => password).first
            ZuoraConnect.logger.debug("[#{@appinstance.id}] API REQUEST - Basic Auth") if @appinstance.present?
            check_instance
          end
        else
          check_instance
        end
        
        if @appinstance.present?
          ZuoraConnect.logger.debug("[#{@appinstance.id}] Authenticate App API Request Completed In - #{(Time.now - start_time).round(2)}s")
        end
      end

       #API ONLY
      def check_instance
        if defined?(@appinstance) && @appinstance.present?
          if @appinstance.new_session_for_api_requests(:params => params)
            @appinstance.new_session(:session => @appinstance.data_lookup(:session => session))
          end
          Thread.current[:appinstance] = @appinstance
          PaperTrail.whodunnit = "API User" if defined?(PaperTrail)
          ElasticAPM.set_user("API User")  if defined?(ElasticAPM) && ElasticAPM.running?
          return true
        else
          response.set_header('WWW-Authenticate', "Basic realm=\"Application\"")
          render json: {"status": 401, "message": "Access Denied"}, status: :unauthorized
          return false
        end
      end

      def authenticate_connect_app_request
        ElasticAPM.set_tag(:trace_id, request.uuid) if defined?(ElasticAPM) && ElasticAPM.running?
        Thread.current[:appinstance] = nil
        start_time = Time.now

        if ZuoraConnect.configuration.mode == "Production"
          zuora_entity_id = request.headers['ZuoraCurrentEntity'] || cookies['ZuoraCurrentEntity']

          if zuora_entity_id.present?

            #Do we need to refresh session identity
            zuora_host = request.headers["HTTP_X_FORWARDED_HOST"] || "apisandbox.zuora.com"
            if request.headers["Zuora-Auth-Token"].present?
              zuora_client = ZuoraAPI::Oauth.new(url: "https://#{zuora_host}", bearer_token: request.headers["Zuora-Auth-Token"], oauth_session_expires_at: Time.now + 5.minutes )
            elsif cookies['ZSession'].present?
              zuora_client = ZuoraAPI::Basic.new(url: "https://#{zuora_host}", session: cookies['ZSession'])
            else
              render "zuora_connect/static/error_handled", :locals => {
                :title => "Missing Authorization Token", 
                :message => "Zuora 'Zuora-Auth-Token' header and 'ZSession' cookie not present."
              }
              return
            end
            zuora_instance_id = params[:sidebar_launch].to_bool ? nil : (params[:app_instance_id] || session["appInstance"])

            #Identity blank or current entity different
            if (session["ZuoraCurrentIdentity"].blank? || session["ZuoraCurrentEntity"] != zuora_entity_id)
              begin
                identity, response = zuora_client.rest_call(url: zuora_client.rest_endpoint("identity"))
                session["ZuoraCurrentIdentity"] = identity
                session["ZuoraCurrentEntity"] = identity['entityId']

                begin 
                  client_describe, response = zuora_client.rest_call(url: zuora_client.rest_endpoint("genesis/user/info").gsub('v1/', ''), session_type: zuora_client.class == ZuoraAPI::Oauth ? :bearer : :basic, headers: zuora_client.class == ZuoraAPI::Oauth ? {} : {'Authorization' => "ZSession-a3N2w #{zuora_client.get_session(prefix: false, auth_type: :basic)}"})
                  session["ZuoraCurrentUserInfo"] = client_describe
                rescue => ex
                  ZuoraConnect.logger.error(ex)
                end

                raise ZuoraConnect::Exceptions::Error.new("Header entity id, '#{zuora_entity_id}' does not match identity call entity id, '#{identity['entityId']}'.") if zuora_entity_id != identity['entityId']

              rescue ZuoraAPI::Exceptions::ZuoraAPIAuthenticationTypeError => ex
                redirect_to "https://#{zuora_host}/apps/newlogin.do?retURL=#{CGI.escape(request.fullpath)}"
                return
              rescue => ex
                ZuoraConnect.logger.error(ex)
                render "zuora_connect/static/error_unhandled", :locals => {:exception => ex}
                return              
              end
            end

            #Find matching app instances.
            if zuora_instance_id.present?
              appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host AND id = :id", entities: [zuora_entity_id], host: zuora_client.rest_domain, id: zuora_instance_id).pluck(:id, :name)
            else
              #if app_instance_ids is present then permissions still controlled by connect
              if params[:app_instance_ids].present? 
                begin
                  navbar, response = zuora_client.rest_call(url: zuora_client.rest_endpoint("navigation"))
                  urls = navbar['menus'].map {|x| x['url']}
                  app_env = ENV["DEIS_APP"] || "xyz123"
                  url = urls.compact.select {|url| File.basename(url).start_with?(app_env + '?')}.first
                  task_ids = JSON.parse(Base64.urlsafe_decode64(CGI.parse(URI.parse(url).query)["app_instance_ids"][0]))
                  
                  appinstances = ZuoraConnect::AppInstance.where(:id => task_ids).pluck(:id, :name)
                rescue => ex
                  ZuoraConnect.logger.error(ex)
                  render "zuora_connect/static/error_unhandled", :locals => {:exception => ex}
                  return
                end
              else
                appinstances = ZuoraConnect::AppInstance.where("zuora_entity_ids ?& array[:entities] = true AND zuora_domain = :host", entities: [zuora_entity_id], host: zuora_client.rest_domain).pluck(:id, :name)
              end
            end

            zuora_user_id = cookies['Zuora-User-Id'] || session["ZuoraCurrentIdentity"]['userId']

            #One deployed instance
            if appinstances.size == 1
              ZuoraConnect.logger.debug("Instance is #{appinstances.to_h.keys.first}")
              @appinstance = ZuoraConnect::AppInstance.find(appinstances.to_h.keys.first)

              #Add user/update 
              @zuora_user = ZuoraConnect::ZuoraUser.where(:zuora_user_id => zuora_user_id).first
              if @zuora_user.present?
                ZuoraConnect.logger.debug("Current zuora user #{zuora_user_id}")
                if @zuora_user.updated_at < Time.now - 1.day
                  @zuora_user.zuora_identity_response[zuora_entity_id] = session["ZuoraCurrentIdentity"]
                  @zuora_user.save!
                end
              else
                ZuoraConnect.logger.debug("New zuora user object for #{zuora_user_id}")
                @zuora_user = ZuoraConnect::ZuoraUser.create!(:zuora_user_id => zuora_user_id, :zuora_identity_response => {zuora_entity_id => session["ZuoraCurrentIdentity"]})
              end 
              @zuora_user.session = session
              session["appInstance"] = @appinstance.id

            #We have multiple, user must pick
            elsif appinstances.size > 1
              ZuoraConnect.logger.debug("User must select instance. #{@names}")
              render "zuora_connect/static/launch", :locals => {:names => appinstances.to_h}
              return
            else 
              begin
                #Ensure user can access oauth creation API 
                if session["ZuoraCurrentIdentity"]['platformRole'] != 'ADMIN' 
                  Thread.current[:appinstance] = nil
                  session["appInstance"] = nil
                  render "zuora_connect/static/error_handled", :locals => {
                    :title => "Application can only complete its initial setup via platform administrator", 
                    :message => "Please contact admin of tenant and have them click on link again to launch application."
                  }
                  return
                end

                user = (ENV['DEIS_APP'] || "Application").split('-').map(&:capitalize).join(' ')
                
                body = {
                  'userId' => zuora_user_id, 
                  'entityIds' => [zuora_entity_id.unpack("a8a4a4a4a12").join('-')], 
                  'customAuthorities' => [], 
                  'additionalInformation' => {
                    'description' => "This user is for #{user} application.", 
                    'name' => "#{user} API User"
                  }
                }

                oauth_response, response = zuora_client.rest_call(method: :post, body: body.to_json, url: zuora_client.rest_endpoint("genesis/clients").gsub('v1/', ''), session_type: zuora_client.class == ZuoraAPI::Oauth ? :bearer : :basic, headers: zuora_client.class == ZuoraAPI::Oauth ? {} : {'Authorization' => "ZSession-a3N2w #{zuora_client.get_session(prefix: false, auth_type: :basic)}"})

                new_zuora_client = ZuoraAPI::Oauth.new(url: "https://#{zuora_host}", oauth_client_id: oauth_response["clientId"], oauth_secret: oauth_response["clientSecret"] )
                if session["ZuoraCurrentUserInfo"].blank?
                  client_describe, response = new_zuora_client.rest_call(url: zuora_client.rest_endpoint("genesis/user/info").gsub('v1/', ''), session_type: :bearer)
                else
                  client_describe = session["ZuoraCurrentUserInfo"]
                end

                Apartment::Tenant.switch!("public")
                next_id = (ZuoraConnect::AppInstance.all.where(:access_token => nil).order(id: :desc).limit(1).pluck(:id).first || 24999999) + 1
                begin
                  Apartment::Tenant.create(next_id.to_s)
                rescue Apartment::TenantExists => ex
                  ZuoraConnect.logger.debug("Tenant Already Exists")
                end
                available_entities = client_describe["accessibleEntities"].select {|entity| entity['id'] == client_describe['defaultEntityId']}
                task_data = {
                  "id": next_id,
                  "name": client_describe["tenantName"],
                  "mode": "Collections",
                  "status": "Running",
                  ZuoraConnect::AppInstance::LOGIN_TENANT_DESTINATION => {
                    "tenant_type": "Zuora",
                    "username": session["ZuoraCurrentIdentity"]["username"],
                    "url": new_zuora_client.url,
                    "status": "Active",
                    "oauth_client_id": oauth_response['clientId'],
                    "oauth_secret": oauth_response['clientSecret'],
                    "authentication_type": "OAUTH",
                    "entities": available_entities.map {|e| e.merge({'displayName' => client_describe["tenantName"]})}
                  },
                  "tenant_ids": available_entities.map{|e| e['entityId'] }.push(client_describe["tenantId"]).uniq,
                }

                @appinstance = ZuoraConnect::AppInstance.new(:id => next_id, :zuora_logins => task_data, :oauth_expires_at => Time.now + 1000.years)
                @appinstance.save(:validate => false)
                @appinstance.refresh
                session["appInstance"] = @appinstance.id
              rescue => ex
                ZuoraConnect.logger.error(ex)
                render "zuora_connect/static/error_unhandled", :locals => {:exception => ex}
                return
              end
            end
          elsif request["data"] && /^([A-Za-z0-9+\/\-\_]{4})*([A-Za-z0-9+\/]{4}|[A-Za-z0-9+\/]{3}=|[A-Za-z0-9+\/]{2}==)$/.match(request["data"].to_s)
            setup_instance_via_data
          else
            if session["appInstance"].present?
              @appinstance = ZuoraConnect::AppInstance.where(:id => session["appInstance"]).first 
            else
              render "zuora_connect/static/error_handled", :locals => {
                :title => "Application state could not be verified", 
                :message => "Please relaunch application."
              }
              return 
            end
          end
        else
          setup_instance_via_dev_mode
        end

        if !defined?(@appinstance) 
          render "zuora_connect/static/error_handled", :locals => {
            :title => "Application state could not be found.", 
            :message => "Please relaunch application."
          }
          return 
        end
        #Call .data_lookup with the current session to retrieve session. In some cases session may be stored/cache in redis 
        #so data lookup provides a model method that can be overriden per app.
        if params[:controller] != 'zuora_connect/api/v1/app_instance' && params[:action] != 'drop'
          if @appinstance.new_session_for_ui_requests(:params => params)
            @appinstance.new_session(:session => @appinstance.data_lookup(:session => session))
          end
        end

        if session["#{@appinstance.id}::user::email"].present? 
          ElasticAPM.set_user(session["#{@appinstance.id}::user::email"])  if defined?(ElasticAPM) && ElasticAPM.running?
          PaperTrail.whodunnit =  session["#{@appinstance.id}::user::email"] if defined?(PaperTrail)
        end
        begin
          I18n.locale = session["#{@appinstance.id}::user::locale"] ?  session["#{@appinstance.id}::user::locale"] : @appinstance.locale
        rescue I18n::InvalidLocale => ex
          ZuoraConnect.logger.error(ex) if !ZuoraConnect::AppInstance::IGNORED_LOCALS.include?(ex.locale.to_s.downcase)
        end
        Time.zone = session["#{@appinstance.id}::user::timezone"] ? session["#{@appinstance.id}::user::timezone"] : @appinstance.timezone
        ZuoraConnect.logger.debug("[#{@appinstance.blank? ? "N/A" : @appinstance.id}] Authenticate App Request Completed In - #{(Time.now - start_time).round(2)}s")
      end

      def persist_connect_app_session
        if @appinstance.present?
          if defined?(Redis.current)
            @appinstance.cache_app_instance
          else
            session.merge!(@appinstance.save_data)
          end
        end
      end

      def check_connect_admin!
        raise ZuoraConnect::Exceptions::AccessDenied.new("User is not an authorized admin for this application") if !session["#{@appinstance.id}::admin"]
      end

      def check_connect_admin
        return session["#{@appinstance.id}::admin"]
      end

      def zuora_user
        return @zuora_user
      end

    private
      def setup_instance_via_data
        session.clear
        values = JSON.parse(ZuoraConnect::AppInstance.decrypt_response(Base64.urlsafe_decode64(request["data"])))
        if values["param_data"]
          values["param_data"].each do |k ,v|
            params[k] = v
          end
        end
        session["#{values["appInstance"]}::destroy"] = values["destroy"]
        session["appInstance"] = values["appInstance"]
        if values["current_user"]
          session["#{values["appInstance"]}::admin"] = values["current_user"]["admin"] ? values["current_user"]["admin"] : false
          session["#{values["appInstance"]}::user::timezone"] = values["current_user"]["timezone"]
          session["#{values["appInstance"]}::user::locale"] = values["current_user"]["locale"]
          session["#{values["appInstance"]}::user::email"] = values["current_user"]["email"]
        end

        ZuoraConnect.logger.debug({msg: 'Setup values', connect: values}) if Rails.env != "production"

        @appinstance = ZuoraConnect::AppInstance.where(:id => values["appInstance"].to_i).first
        if @appinstance.blank?
          Apartment::Tenant.switch!("public")
          begin
            Apartment::Tenant.create(values["appInstance"].to_s)
          rescue Apartment::TenantExists => ex
            ZuoraConnect.logger.debug("Tenant Already Exists")
          end
          @appinstance = ZuoraConnect::AppInstance.new(:api_token =>  values[:api_token],:id => values["appInstance"].to_i, :access_token => values["access_token"].blank? ? values["user"] : values["access_token"], :token => values["refresh_token"]  , :refresh_token => values["refresh_token"].blank? ? values["key"] : values["refresh_token"], :oauth_expires_at => values["expires"])
          @appinstance.save(:validate => false)
        else
          @appinstance.access_token = values["access_token"] if !values["access_token"].blank? && @appinstance.access_token != values["access_token"]
          @appinstance.refresh_token = values["refresh_token"] if !values["refresh_token"].blank? && @appinstance.refresh_token != values["refresh_token"]
          @appinstance.oauth_expires_at = values["expires"] if !values["expires"].blank?
          @appinstance.api_token = values["api_token"] if !values["api_token"].blank? && @appinstance.api_token != values["api_token"]
          if @appinstance.access_token_changed? && @appinstance.refresh_token_changed?
            @appinstance.save(:validate => false)
          else
            raise ZuoraConnect::Exceptions::AccessDenied.new("Authorization mistmatch. Possible tampering")
          end
        end     
      end

      def setup_instance_via_dev_mode
        session["appInstance"] = ZuoraConnect.configuration.dev_mode_appinstance
        user = ZuoraConnect.configuration.dev_mode_user
        key = ZuoraConnect.configuration.dev_mode_pass
        values = {:user => user , :key => key, :appinstance => session["appInstance"]}
        @appinstance = ZuoraConnect::AppInstance.where(:id => values[:appinstance].to_i).first
        if @appinstance.blank?
          Apartment::Tenant.switch!("public")
          begin
            Apartment::Tenant.create(values[:appinstance].to_s)
          rescue Apartment::TenantExists => ex
            Apartment::Tenant.drop(values[:appinstance].to_s)
            retry
          end

          @appinstance = ZuoraConnect::AppInstance.new(:id => values[:appinstance].to_i, :access_token => values[:user], :refresh_token => values[:key], :token => "#{values[:key]}#{values[:key]}", :api_token => "#{values[:key]}#{values[:key]}")
          @appinstance.save(:validate => false)
        end
        if @appinstance.access_token.blank? || @appinstance.refresh_token.blank? || @appinstance.token.blank? || @appinstance.api_token.blank?
          @appinstance.update_attributes!(:access_token =>  values["user"], :refresh_token =>  values["key"], :token => "#{values[:key]}#{values[:key]}", :api_token => "#{values[:key]}#{values[:key]}")
        end
        session["#{@appinstance.id}::admin"] =  ZuoraConnect.configuration.dev_mode_admin
      end
    end
  end
end