extended unregister API endpoint

* added possibility to delete the local data with the
  "deleteLocalAccountData" signal-cli command

see #242

src/api/api.go

@@ -70,6 +70,7 @@ type RegisterNumberRequest struct {
 
 type UnregisterNumberRequest struct {
 	DeleteAccount bool `json:"delete_account" example:"false"`
+	DeleteLocalData bool `json:"delete_local_data" example:"false"`
 }
 
 type VerifyNumberSettings struct {
@@ -223,6 +224,7 @@ func (a *Api) UnregisterNumber(c *gin.Context) {
 	number := c.Param("number")
 
 	deleteAccount := false
+	deleteLocalData := false
 	buf := new(bytes.Buffer)
 	buf.ReadFrom(c.Request.Body)
 	if buf.String() != "" {
@@ -234,9 +236,10 @@ func (a *Api) UnregisterNumber(c *gin.Context) {
 			return
 		}
 		deleteAccount = req.DeleteAccount
+		deleteLocalData = req.DeleteLocalData
 	}
 
-	err := a.signalClient.UnregisterNumber(number, deleteAccount)
+	err := a.signalClient.UnregisterNumber(number, deleteAccount, deleteLocalData)
 	if err != nil {
 		c.JSON(400, gin.H{"error": err.Error()})
 		return

src/client/client.go

@@ -9,6 +9,7 @@ import (
 	"path/filepath"
 	"strconv"
 	"strings"
+	"fmt"
 
 	securejoin "github.com/cyphar/filepath-securejoin"
 	"github.com/gabriel-vasile/mimetype"
@@ -427,7 +428,7 @@ func (s *SignalClient) RegisterNumber(number string, useVoice bool, captcha stri
 	return err
 }
 
-func (s *SignalClient) UnregisterNumber(number string, deleteAccount bool) error {
+func (s *SignalClient) UnregisterNumber(number string, deleteAccount bool, deleteLocalData bool) error {
 	if s.signalCliMode == JsonRpc {
 		return errors.New("This functionality is only available in normal/native mode!")
 	}
@@ -438,6 +439,17 @@ func (s *SignalClient) UnregisterNumber(number string, deleteAccount bool) error
 	}
 
 	_, err := s.cliClient.Execute(true, command, "")
+
+	if deleteLocalData {
+		command := []string{"--config", s.signalCliConfig, "-a", number, "deleteLocalAccountData"}
+		_, err2 := s.cliClient.Execute(true, command, "")
+		if (err2 != nil) && (err != nil) {
+			err = fmt.Errorf("%w (%w)", err, err2)
+		} else if (err2 != nil) && (err == nil) {
+			err = err2
+		}
+	}
+
 	return err
 }