cloudflare: fix purging of cached urls.

* Switch CloudflareService from HttpartyCache to Danbooru::Http.

* Purge cached urls from Cloudflare when a post is replaced and the md5
  doesn't change. This happens when a corrupted image is replaced or
  thumbnails are regenerated. Before we purged urls when a post was
  expunged, which was unneeded because those urls can expire naturally.
  It was also wrong because the subdomains were hardcoded, the urls used
  http:// instead of https://, and we didn't account for tagged urls.

app/logical/cloudflare_service.rb

@@ -1,48 +1,32 @@
-# donmai.us specific
-
 class CloudflareService
+  attr_reader :api_token, :zone
+
+  def initialize(api_token: Danbooru.config.cloudflare_api_token, zone: Danbooru.config.cloudflare_zone)
+    @api_token, @zone = api_token, zone
+  end
+
   def enabled?
     api_token.present? && zone.present?
   end
 
-  def api_token
-    Danbooru.config.cloudflare_api_token
-  end
-
-  def zone
-    Danbooru.config.cloudflare_zone
-  end
-
-  def options
-    Danbooru.config.httparty_options.deep_merge(headers: {
-      "Authorization" => "Bearer #{api_token}",
-      "Content-Type" => "application/json",
-      "User-Agent" => "#{Danbooru.config.canonical_app_name}/#{Rails.application.config.x.git_hash}"
-    })
-  end
-
   def ips(expiry: 24.hours)
-    text, code = HttpartyCache.get("https://api.cloudflare.com/client/v4/ips", expiry: expiry)
-    return [] if code != 200
+    response = Danbooru::Http.cache(expiry).get("https://api.cloudflare.com/client/v4/ips")
+    return [] if response.code != 200
 
-    json = JSON.parse(text, symbolize_names: true)
-    ips = json[:result][:ipv4_cidrs] + json[:result][:ipv6_cidrs]
+    result = response.parse["result"]
+    ips = result["ipv4_cidrs"] + result["ipv6_cidrs"]
     ips.map { |ip| IPAddr.new(ip) }
   end
 
-  def delete(md5, ext)
+  def purge_cache(urls)
     return unless enabled?
 
-    url = "https://api.cloudflare.com/client/v4/zones/#{zone}/purge_cache"
-    files = ["#{md5}.#{ext}", "preview/#{md5}.jpg", "sample/sample-#{md5}.jpg"].map do |name|
-      ["danbooru", "safebooru", "raikou1", "raikou2", "raikou3", "raikou4"].map do |subdomain|
-        "http://#{subdomain}.donmai.us/data/#{name}"
-      end
-    end.flatten
-    body = {
-      "files" => files
-    }.to_json
+    cloudflare = Danbooru::Http.headers(
+      "Authorization" => "Bearer #{api_token}",
+      "Content-Type" => "application/json"
+    )
 
-    HTTParty.delete(url, options.merge(body: body)) #, body: body)
+    url = "https://api.cloudflare.com/client/v4/zones/#{zone}/purge_cache"
+    cloudflare.delete(url, json: { files: urls })
   end
 end