generalize request decoding

agt/ballotagent/ballotagent.go

@@ -34,7 +34,7 @@ func (rsa *BallotServerAgent) checkMethod(method string, w http.ResponseWriter,
 	return true
 }
 
-func (*BallotServerAgent) decodeRequest(r *http.Request) (req rad.BallotRequest, err error) {
+func decodeRequest[Req rad.Request](r *http.Request) (req Req, err error) {
 	buf := new(bytes.Buffer)
 	buf.ReadFrom(r.Body)
 	err = json.Unmarshal(buf.Bytes(), &req)

agt/ballotagent/new_ballot.go

@@ -31,7 +31,7 @@ func (rsa *BallotServerAgent) createBallot(w http.ResponseWriter, r *http.Reques
 	}
 
 	// décodage de la requête
-	req, err := rsa.decodeRequest(r)
+	req, err := decodeRequest[rad.BallotRequest](r)
 	if err != nil {
 		w.WriteHeader(http.StatusBadRequest)
 		fmt.Fprint(w, err.Error())

types.go

@@ -23,3 +23,7 @@ type ResultResponse struct {
 	Winner  int   `json:"winner"`
 	Ranking []int `json:"ranking"`
 }
+
+type Request interface {
+	BallotRequest | Ballot | Vote
+}