feat(protocol): validate generated gateway contracts

gen/go/protocol/protocol.go

@@ -414,6 +414,9 @@ func (v AllocationPolicy) Validate() error {
 	if v.ReservationLeaseSeconds > 3600 {
 		violations = append(violations, FieldViolation{Field: "reservation_lease_seconds", Code: "maximum"})
 	}
+	if v.MinimumKbps > v.TargetKbps || v.TargetKbps > v.MaximumKbps {
+		violations = append(violations, FieldViolation{Field: "bounds", Code: "invalid_order"})
+	}
 	if len(violations) > 0 {
 		return ValidationError{Violations: violations}
 	}
@@ -918,6 +921,9 @@ func (v ChannelFrame) Validate() error {
 	if len(v.Payload) > 87384 {
 		violations = append(violations, FieldViolation{Field: "payload", Code: "max_length"})
 	}
+	if v.FragmentIndex >= v.FragmentCount {
+		violations = append(violations, FieldViolation{Field: "fragment_index", Code: "invalid_order"})
+	}
 	if len(violations) > 0 {
 		return ValidationError{Violations: violations}
 	}
@@ -2227,6 +2233,9 @@ func (v GatewayRegistration) Validate() error {
 	if err := v.Capabilities.Validate(); err != nil {
 		violations = append(violations, FieldViolation{Field: "capabilities", Code: "invalid_object"})
 	}
+	if v.ProtocolMinVersion > v.ProtocolMaxVersion {
+		violations = append(violations, FieldViolation{Field: "protocol_version", Code: "invalid_order"})
+	}
 	if len(violations) > 0 {
 		return ValidationError{Violations: violations}
 	}
@@ -2484,6 +2493,9 @@ func (v ManifestBounds) Validate() error {
 	if v.MaximumKbps > 100000000 {
 		violations = append(violations, FieldViolation{Field: "maximum_kbps", Code: "maximum"})
 	}
+	if v.MinimumKbps > v.TargetKbps || v.TargetKbps > v.MaximumKbps {
+		violations = append(violations, FieldViolation{Field: "bounds", Code: "invalid_order"})
+	}
 	if len(violations) > 0 {
 		return ValidationError{Violations: violations}
 	}
@@ -4043,3 +4055,21 @@ func EncodeVersionNegotiation(value VersionNegotiation) ([]byte, error) {
 	}
 	return json.Marshal(value)
 }
+
+var ErrNoCapabilityOverlap = errors.New("no capability overlap")
+
+func IntersectCapabilityProfiles(profiles ...CapabilityProfile) (CapabilityProfile, error) {
+	if len(profiles) == 0 {
+		return CapabilityProfile{}, ErrNoCapabilityOverlap
+	}
+	selected := profiles[0]
+	if err := selected.Validate(); err != nil {
+		return CapabilityProfile{}, ErrNoCapabilityOverlap
+	}
+	for _, profile := range profiles[1:] {
+		if err := profile.Validate(); err != nil || profile != selected {
+			return CapabilityProfile{}, ErrNoCapabilityOverlap
+		}
+	}
+	return selected, nil
+}