Add OpenPGP key to LDAP directory and User model

app/models/user.rb

@@ -3,9 +3,10 @@ require 'nostr'
 class User < ApplicationRecord
   include EmailValidatable
 
-  attr_accessor :display_name
-  attr_accessor :avatar_new
   attr_accessor :current_password
+  attr_accessor :avatar_new
+  attr_accessor :display_name
+  attr_accessor :pgp_pubkey
 
   serialize :preferences, coder: UserPreferences
 
@@ -51,6 +52,8 @@ class User < ApplicationRecord
 
   validate :acceptable_avatar
 
+  validate :acceptable_pgp_key_format, if: -> { defined?(@pgp_pubkey) && @pgp_pubkey != "" }
+
   #
   # Scopes
   #
@@ -165,6 +168,23 @@ class User < ApplicationRecord
     Nostr::PublicKey.new(nostr_pubkey).to_bech32
   end
 
+  def pgp_pubkey
+    @pgp_pubkey ||= ldap_entry[:pgp_key]
+  end
+
+  def gnupg_key
+    return nil unless pgp_pubkey.present?
+    @gnupg_key ||= GPGME::Key.get(pgp_fpr)
+  end
+
+  def pgp_pubkey_contains_user_address?
+    gnupg_key.uids.map(&:email).include?(address)
+  end
+
+  def wkd_hash
+    ZBase32.encode(Digest::SHA1.digest(cn))
+  end
+
   def avatar
     @avatar_base64 ||= LdapManager::FetchAvatar.call(cn: cn)
   end
@@ -214,4 +234,10 @@ class User < ApplicationRecord
         errors.add(:avatar, "must be a JPEG or PNG file")
       end
     end
+
+    def acceptable_pgp_key_format
+      unless GPGME::Key.valid?(pgp_pubkey)
+        errors.add(:pgp_pubkey, 'is not a valid armored PGP public key block')
+      end
+    end
 end