+
+ def public_key_must_be_unique
+ if self.public_key
+ valid_key = SSHKey.valid_ssh_public_key? self.public_key
+
+ if not valid_key
+ errors.add(:public_key, "does not appear to be a valid ssh-rsa or dsa public key")
+ else
+ # Valid if no other rows have this public key
+ if self.class.where('uuid != ? and public_key like ?',
+ uuid || '', "%#{self.public_key}%").any?
+ errors.add(:public_key, "already exists in the database, use a different key.")
+ return false
+ end
+ end
+ end
+ return true
+ end