add service for purging files from cloudflare cache

test/unit/cloudflare_service_test.rb

@@ -0,0 +1,27 @@
+require 'test_helper'
+require 'webmock/minitest'
+
+class CloudflareServiceTest < ActiveSupport::TestCase
+  def setup
+    super
+
+    Danbooru.config.stubs(:cloudflare_key).returns("xyz")
+    Danbooru.config.stubs(:cloudflare_email).returns("abc")
+    Danbooru.config.stubs(:cloudflare_zone).returns("123")
+  end
+
+  subject { CloudflareService.new }
+
+  context "#delete" do
+    setup do
+      stub_request(:any, "api.cloudflare.com")
+    end
+
+    should "make calls to cloudflare's api" do
+      subject.delete("md5", "png")
+      assert_requested(:delete,  "https://api.cloudflare.com/client/v4/zones/123/purge_cache", times: 1) do |req|
+        req.body =~ /danbooru\.donmai\.us/ && req.body =~ /safebooru\.donmai\.us/ && req.body =~ /sample/ && req.body =~ /preview/
+      end
+    end
+  end
+end