+
+ def public_key_must_be_unique
+ if self.public_key
+ key = /ssh-rsa [A-Za-z0-9+\/]+/.match(self.public_key)
+
+ if not key
+ errors.add(:public_key, "Does not appear to be a valid ssh-rsa key")
+ else
+ # Valid if no other rows have this public key
+ if self.class.where('public_key like ?', "%#{key[0]}%").any?
+ errors.add(:public_key, "Key already exists in the database, use a different key.")
+ return false
+ end
+ end
+ end
+ return true
+ end