ip addresses: add ip lookup api client.

app/logical/ip_lookup.rb

@@ -0,0 +1,27 @@
+# API client for https://ipregistry.co/
+
+class IpLookup
+  extend Memoist
+
+  attr_reader :ip_addr, :api_key, :cache_duration
+
+  def initialize(ip_addr, api_key: Danbooru.config.ip_registry_api_key, cache_duration: 1.day)
+    @ip_addr = ip_addr
+    @api_key = api_key
+    @cache_duration = cache_duration
+  end
+
+  def info
+    return {} unless api_key.present?
+    response = Danbooru::Http.cache(cache_duration).get("https://api.ipregistry.co/#{ip_addr}?key=#{api_key}")
+    return {} if response.status != 200
+    json = response.parse.deep_symbolize_keys.with_indifferent_access
+    json
+  end
+
+  def is_proxy?
+    info[:security].present? && info[:security].values.any?
+  end
+
+  memoize :info, :is_proxy?
+end