access-engine/internal/decision/json_profile.go

package decision

import "context"

// LosslessJSONProfile is an explicit optional wire decoder profile for the
// normal /v1/check handler. Legacy callers retain their original float64
// projection. The canonical request and signature algorithms are unchanged.
const LosslessJSONProfile = "lossless-json-v1"
const losslessStandaloneMode = "standalone/lossless-json-v1"

type jsonProfileContextKey struct{}

// WithLosslessJSONProfile is called only by the producer after selecting its
// UseNumber decoder. No request/body flag can install this context key. The
// signed provenance mode authenticates which decoder produced the decision.
func WithLosslessJSONProfile(ctx context.Context) context.Context {
	return context.WithValue(ctx, jsonProfileContextKey{}, LosslessJSONProfile)
}

func envelopeMode(ctx context.Context) string {
	if ctx.Value(jsonProfileContextKey{}) == LosslessJSONProfile {
		return losslessStandaloneMode
	}
	return "standalone"
}