Add IPService

app/services/ip_service.rb

@@ -0,0 +1,36 @@
+class IPService
+  class << self
+    def ip_trusted?(ip)
+      ip_address = parse_address(ip)
+
+      if ip_address.nil?
+        false
+      elsif trusted_networks.present?
+        trusted_networks.any? { |network| network.include?(ip_address) }
+      else
+        false
+      end
+    end
+
+    private
+
+    def trusted_networks
+      if ENV['TRUSTED_NETWORKS'].present?
+        ENV['TRUSTED_NETWORKS']
+          .split
+          .map { |string| parse_address(string) }
+          .compact
+      else
+        []
+      end
+    end
+
+    def parse_address(address)
+      begin
+        IPAddr.new(address)
+      rescue
+        nil
+      end
+    end
+  end
+end