ip addresses: move more logic to Danbooru::IpAddress.

* Move `is_local?` from IpLookup to Danbooru::IpAddress.
* Refactor more things to use Danbooru::IpAddress instead of using
  IPAddress directly.

app/logical/concerns/searchable.rb

@@ -79,10 +79,10 @@ module Searchable
 
   def where_inet_matches(attr, value)
     if value.match?(/[, ]/)
-      ips = value.split(/[, ]+/).map { |ip| IPAddress.parse(ip).to_string }
+      ips = value.split(/[, ]+/).map { |ip| Danbooru::IpAddress.new(ip).to_string }
       where("#{qualified_column_for(attr)} = ANY(ARRAY[?]::inet[])", ips)
     else
-      ip = IPAddress.parse(value)
+      ip = Danbooru::IpAddress.new(value)
       where("#{qualified_column_for(attr)} <<= ?", ip.to_string)
     end
   end

app/logical/danbooru/ip_address.rb

@@ -5,10 +5,23 @@
 module Danbooru
   class IpAddress
     attr_reader :ip_address
-    delegate_missing_to :ip_address
+    delegate :ipv4?, :ipv6?, :loopback?, :link_local?, :unique_local?, :private?, :to_string, :prefix, :multicast?, :unspecified?, to: :ip_address
+    delegate :ip_info, :is_proxy?, to: :ip_lookup
 
     def initialize(string)
-      @ip_address = ::IPAddress.parse(string)
+      @ip_address = ::IPAddress.parse(string.to_s)
+    end
+
+    def ip_lookup
+      @ip_lookup ||= IpLookup.new(self)
+    end
+
+    def is_local?
+      if ipv4?
+        loopback? || link_local? || multicast? || private?
+      elsif ipv6?
+        loopback? || link_local? || unique_local? || unspecified?
+      end
     end
 
     # "1.2.3.4/24" if the address is a subnet, "1.2.3.4" otherwise.
@@ -19,5 +32,17 @@ module Danbooru
     def inspect
       "#<Danbooru::IpAddress #{to_s}>"
     end
+
+    def ==(other)
+      self.class == other.class && to_s == other.to_s
+    end
+
+    # This is needed to be able to correctly treat IpAddresses as hash keys,
+    # which Rails does internally when preloading associations.
+    def hash
+      to_s.hash
+    end
+
+    alias_method :eql?, :==
   end
 end

app/logical/ip_lookup.rb

@@ -10,12 +10,13 @@ class IpLookup
   end
 
   def initialize(ip_addr, api_key: Danbooru.config.ip_registry_api_key, cache_duration: 3.days)
-    @ip_addr = IPAddress.parse(ip_addr.to_s)
+    @ip_addr = Danbooru::IpAddress.new(ip_addr)
     @api_key = api_key
     @cache_duration = cache_duration
   end
 
   def ip_info
+    return {} if ip_addr.is_local?
     return {} if response.blank?
 
     {
@@ -43,14 +44,6 @@ class IpLookup
     json
   end
 
-  def is_local?
-    if ip_addr.ipv4?
-      ip_addr.loopback? || ip_addr.link_local? || ip_addr.private?
-    elsif ip_addr.ipv6?
-      ip_addr.loopback? || ip_addr.link_local? || ip_addr.unique_local?
-    end
-  end
-
   def is_proxy?
     response[:security].present? && response[:security].values.any?
   end

app/logical/user_verifier.rb

@@ -12,7 +12,7 @@ class UserVerifier
 
   def requires_verification?
     return false if !Danbooru.config.new_user_verification?
-    return false if is_local_ip?
+    return false if ip_address.is_local?
 
     # we check for IP bans first to make sure we bump the IP ban hit count
     is_ip_banned? || is_logged_in? || is_recent_signup? || is_proxy?
@@ -33,11 +33,7 @@ class UserVerifier
   private
 
   def ip_address
-    @ip_address ||= IPAddress.parse(request.remote_ip)
-  end
-
-  def is_local_ip?
-    IpLookup.new(ip_address).is_local?
+    @ip_address ||= Danbooru::IpAddress.new(request.remote_ip)
   end
 
   def is_logged_in?
@@ -56,7 +52,7 @@ class UserVerifier
   end
 
   def is_proxy?
-    IpLookup.new(ip_address).is_proxy?
+    ip_address.is_proxy?
   end
 
   def to_h

app/logical/validating_socket.rb

@@ -12,16 +12,8 @@ class ValidatingSocket < TCPSocket
   end
 
   def validate_hostname!(hostname)
-    ip = IPAddress.parse(::Resolv.getaddress(hostname))
-    raise ProhibitedIpError, "Connection to #{hostname} failed; #{ip} is a prohibited IP" if prohibited_ip?(ip)
+    ip = Danbooru::IpAddress.new(::Resolv.getaddress(hostname))
+    raise ProhibitedIpError, "Connection to #{hostname} failed; #{ip} is a prohibited IP" if ip.is_local?
     ip.to_s
   end
-
-  def prohibited_ip?(ip)
-    if ip.ipv4?
-      ip.loopback? || ip.link_local? || ip.multicast? || ip.private?
-    elsif ip.ipv6?
-      ip.loopback? || ip.link_local? || ip.unique_local? || ip.unspecified?
-    end
-  end
 end

app/models/ip_address.rb

@@ -37,7 +37,7 @@ class IpAddress < ApplicationRecord
   end
 
   def lookup
-    @lookup ||= IpLookup.new(ip_addr)
+    @lookup ||= ip_addr.ip_lookup
   end
 
   def to_s

app/models/ip_geolocation.rb

@@ -1,6 +1,9 @@
 # An IpGeolocation contains metadata associated with an IP address, primarily geolocation data.
 
 class IpGeolocation < ApplicationRecord
+  attribute :ip_addr, :ip_address
+  attribute :network, :ip_address
+
   has_many :user_sessions, foreign_key: :ip_addr, primary_key: :ip_addr
 
   def self.visible(user)
@@ -17,13 +20,12 @@ class IpGeolocation < ApplicationRecord
     q
   end
 
-  def self.create_or_update!(ip_addr)
-    ip_lookup = IpLookup.new(ip_addr)
-    return nil if ip_lookup.is_local?
-    return nil if ip_lookup.ip_info.blank?
+  def self.create_or_update!(ip)
+    ip_address = Danbooru::IpAddress.new(ip)
+    return nil if ip_address.ip_info.blank?
 
-    ip_geolocation = IpGeolocation.create_with(**ip_lookup.ip_info).create_or_find_by!(ip_addr: ip_addr)
-    ip_geolocation.update!(**ip_lookup.ip_info)
+    ip_geolocation = IpGeolocation.create_with(**ip_address.ip_info).create_or_find_by!(ip_addr: ip_address)
+    ip_geolocation.update!(**ip_address.ip_info)
     ip_geolocation
   end
 end

app/models/user_session.rb

@@ -3,6 +3,8 @@
 # and their browser user agent. This is used to track logins and other events.
 
 class UserSession < ApplicationRecord
+  attribute :ip_addr, :ip_address
+
   belongs_to :ip_geolocation, foreign_key: :ip_addr, primary_key: :ip_addr, optional: true
 
   def self.visible(user)