Persist RS auth tokens in Redis

spec/factories/remote_storage_authorizations.rb

@@ -0,0 +1,9 @@
+FactoryBot.define do
+  factory :remote_storage_authorization do
+    permissions { ["documents:rw"] }
+    client_id { "some-fancy-app" }
+    redirect_uri { "https://example.com/some-fancy-app" }
+    app_name { "Fancy App" }
+    expire_at { nil }
+  end
+end

spec/jobs/expire_remote_storage_authorization_job_spec.rb

@@ -0,0 +1,36 @@
+require 'rails_helper'
+
+RSpec.describe ExpireRemoteStorageAuthorizationJob, type: :job do
+  before do
+    @user = create :user, cn: "ronald", ou: "kosmos.org"
+    @rs_authorization = create :remote_storage_authorization, user: @user, expire_at: 1.day.ago
+  end
+
+  after do
+    clear_enqueued_jobs
+    clear_performed_jobs
+  end
+
+  subject(:job) {
+    described_class.perform_later(@rs_authorization.id)
+  }
+
+  let(:redis) {
+    @redis ||= Redis.new(url: Setting.redis_url)
+  }
+
+  it "removes the RS authorization from redis" do
+    redis_key = "rs:authorizations:#{@user.address}:#{@rs_authorization.token}"
+    expect(redis.keys(redis_key)).to_not be_empty
+
+    perform_enqueued_jobs { job }
+
+    expect(redis.keys(redis_key)).to be_empty
+  end
+
+  it "deletes the RS authorization object" do
+    expect {
+      perform_enqueued_jobs { job }
+    }.to change(RemoteStorageAuthorization, :count).by(-1)
+  end
+end