Merge branch 'xx-2655/permissioning' into 'peppa/newClient'

Add function for registering with permissioning

See merge request !419

api/permissioning.go

+////////////////////////////////////////////////////////////////////////////////
+// Copyright © 2020 Privategrity Corporation                                   /
+//                                                                             /
+// All rights reserved.                                                        /
+////////////////////////////////////////////////////////////////////////////////
+
+package api
+
+import (
+	"github.com/pkg/errors"
+	"gitlab.com/elixxir/client/context"
+	"gitlab.com/elixxir/client/globals"
+	"gitlab.com/elixxir/client/network/permissioning"
+	"gitlab.com/elixxir/client/storage"
+	"gitlab.com/elixxir/comms/client"
+)
+
+// Returns an error if registration fails.
+func RegisterWithPermissioning(ctx context.Context, comms client.Comms, registrationCode string) error {
+	instance := ctx.Manager.GetInstance()
+	instance.GetPartialNdf()
+
+	//Check the regState is in proper state for registration
+	regState := ctx.Session.GetRegistrationStatus()
+	if regState != storage.KeyGenComplete {
+		return errors.Errorf("Attempting to register before key generation!")
+	}
+
+	userData := ctx.Session.User()
+
+	// Register with the permissioning server and generate user information
+	regValidationSignature, err := permissioning.RegisterWithPermissioning(&comms,
+		userData.GetCryptographicIdentity().GetRSA().GetPublic(), registrationCode)
+	if err != nil {
+		globals.Log.INFO.Printf(err.Error())
+		return err
+	}
+
+	// update the session with the registration response
+	userData.SetRegistrationValidationSignature(regValidationSignature)
+
+	err = ctx.Session.ForwardRegistrationStatus(storage.PermissioningComplete)
+	if err != nil {
+		return err
+	}
+
+	return nil
+}