Merge pull request #41 from jwetzell/fix/dtmf-create-rune-check

return error if DTMF create results in invalid characters

internal/processor/sip-response-dtmf-create.go

@@ -4,6 +4,7 @@ import (
 	"bytes"
 	"context"
 	"errors"
+	"regexp"
 	"text/template"
 
 	"github.com/jwetzell/showbridge-go/internal/config"
@@ -14,6 +15,7 @@ type SipResponseDTMFCreate struct {
 	PreWait   int
 	PostWait  int
 	Digits    *template.Template
+	validDTMF *regexp.Regexp
 }
 
 type SipDTMFResponse struct {
@@ -33,6 +35,10 @@ func (scc *SipResponseDTMFCreate) Process(ctx context.Context, payload any) (any
 
 	digitsString := digitsBuffer.String()
 
+	if !scc.validDTMF.MatchString(digitsString) {
+		return nil, errors.New("sip.response.dtmf.create result of digits template contains invalid characters")
+	}
+
 	return SipDTMFResponse{
 		PreWait:  scc.PreWait,
 		PostWait: scc.PostWait,
@@ -91,7 +97,7 @@ func init() {
 			if err != nil {
 				return nil, err
 			}
-			return &SipResponseDTMFCreate{config: config, Digits: digitsTemplate, PreWait: int(preWaitNum), PostWait: int(postWaitNum)}, nil
+			return &SipResponseDTMFCreate{config: config, Digits: digitsTemplate, PreWait: int(preWaitNum), PostWait: int(postWaitNum), validDTMF: regexp.MustCompile(`^[0-9*#A-Da-d]+$`)}, nil
 		},
 	})
 }