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

app/models/ip_address.rb

@@ -37,6 +37,10 @@ class IpAddress < ApplicationRecord
     group(:user_id).select("user_id, COUNT(*) AS count_all").reorder("count_all DESC, user_id")
   end
 
+  def lookup
+    @lookup ||= IpLookup.new(ip_addr)
+  end
+
   def to_s
     # include the subnet mask only when the IP denotes a subnet.
     (ip_addr.size > 1) ? ip_addr.to_string : ip_addr.to_s