adding time checking (ebauman#1)

* added notAfter and notBefore checks

* ignoring golicense binary

.gitignore

@@ -1,3 +1,4 @@
 ./golicense
 *.pem
-.idea/
+.idea/
+golicense

pkg/client/client.go

@@ -5,6 +5,7 @@ import (
 	"fmt"
 	license2 "github.com/ebauman/golicense/pkg/license"
 	"github.com/ebauman/golicense/pkg/types"
+	"time"
 )
 
 func Blocking(licenseKey string, usages map[string]int, publicKeys []*rsa.PublicKey) types.LicensingResponse {
@@ -25,6 +26,16 @@ func Blocking(licenseKey string, usages map[string]int, publicKeys []*rsa.Public
 		return types.NewLicensingResponse(false, err)
 	}
 
+	// it's a license. is it expired?
+	if license.NotAfter.Before(time.Now()) {
+		return types.NewLicensingResponse(false, types.NewLicenseExpiredError())
+	}
+
+	// are we using it before we should?
+	if license.NotBefore.After(time.Now()) {
+		return types.NewLicensingResponse(false, types.NewLicenseNotYetValidError())
+	}
+
 	// valid license, check usages
 	for k, v := range usages {
 		// check to see if there is a grant for what we're trying to use

pkg/types/errors.go

@@ -99,3 +99,25 @@ func (InvalidPublicKeysError) Error() string {
 func NewInvalidPublicKeysError() InvalidPublicKeysError {
 	return InvalidPublicKeysError{}
 }
+
+type LicenseExpiredError struct {
+}
+
+func (LicenseExpiredError) Error() string {
+	return fmt.Sprintf("license expired")
+}
+
+func NewLicenseExpiredError() LicenseExpiredError {
+	return LicenseExpiredError{}
+}
+
+type LicenseNotYetValidError struct {
+}
+
+func (LicenseNotYetValidError) Error() string {
+	return fmt.Sprintf("license not yet valid")
+}
+
+func NewLicenseNotYetValidError() LicenseNotYetValidError {
+	return LicenseNotYetValidError{}
+}