# File lib/dragonfly/job.rb, line 154 def sha unless app.secret raise CannotGenerateSha, "A secret is required to sign and verify Dragonfly job requests. "\ "Use `secret '...'` or `verify_urls false` (not recommended!) in your config." end OpenSSL::HMAC.hexdigest('SHA256', app.secret, to_unique_s)[0,16] end