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packages/zammad-addon-pgp/src/app/models/pgp_keypair.rb

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+# Copyright (C) 2012-2022 Zammad Foundation, https://zammad-foundation.org/
+
+class PGPKeypair < ApplicationModel
+  validates :fingerprint, uniqueness: { case_sensitive: true }
+
+  def self.create_private_keys(raw, secret)
+    Sequoia.emails_of(keys: raw).each do |address|
+      downcased_address = address.downcase
+      public_key = find_each.detect do |certificate|
+        certificate.email_addresses.include?(downcased_address)
+      end
+
+      unless public_key
+        raise Exceptions::UnprocessableEntity,
+              'The public key for this private key could not be found.'
+      end
+
+      public_key.update!(private_key: raw, private_key_secret: secret)
+    end
+  end
+
+  def self.create_public_keys(raw)
+    create!(public_key: raw)
+  end
+
+  def self.for_sender_email_address(address)
+    downcased_address = address.downcase
+    where.not(private_key: nil).find_each.detect do |certificate|
+      certificate.email_addresses.include?(downcased_address)
+    end
+  end
+
+  def self.for_recipient_email_addresses!(addresses)
+    certificates        = []
+    remaining_addresses = addresses.map(&:downcase)
+    find_each do |certificate|
+      # intersection of both lists
+      certificate_for = certificate.email_addresses & remaining_addresses
+      next if certificate_for.blank?
+
+      certificates.push(certificate)
+
+      # subtract found recipient(s)
+      remaining_addresses -= certificate_for
+
+      # end loop if no addresses are remaining
+      break if remaining_addresses.blank?
+    end
+
+    return certificates if remaining_addresses.blank?
+
+    raise ActiveRecord::RecordNotFound,
+          "Can't find PGP encryption certificates for: #{remaining_addresses.join(', ')}"
+  end
+
+  def public_key=(string)
+    self.fingerprint = Sequoia.fingerprints_of(keys: string).first
+    self[:public_key] = string
+  end
+
+  def email_addresses
+    @email_addresses ||= Sequoia.emails_of(keys: public_key)
+  end
+end