fix: use helpers to create flow

selfservice/flow/registration/flow.go

@@ -75,19 +75,12 @@ type Flow struct {
 }
 
 func NewFlow(exp time.Duration, csrf string, r *http.Request, ft flow.Type) *Flow {
-	source := urlx.Copy(r.URL)
-	source.Host = r.Host
-
-	source.Scheme = "http"
-	if r.TLS != nil {
-		source.Scheme = "https"
-	}
-
+	now := time.Now().UTC()
 	return &Flow{
 		ID:         x.NewUUID(),
-		ExpiresAt:  time.Now().UTC().Add(exp),
-		IssuedAt:   time.Now().UTC(),
-		RequestURL: source.String(),
+		ExpiresAt:  now.Add(exp),
+		IssuedAt:   now,
+		RequestURL: x.RequestURL(r).String(),
 		Methods:    map[identity.CredentialsType]*FlowMethod{},
 		CSRFToken:  csrf,
 		Type:       ft,

selfservice/flow/registration/flow_test.go

@@ -57,7 +57,7 @@ func TestNewFlow(t *testing.T) {
 		r := registration.NewFlow(0, "csrf", &http.Request{
 			URL:  urlx.ParseOrPanic("https://ory.sh/"),
 			Host: "ory.sh"}, flow.TypeBrowser)
-		assert.Equal(t, "http://ory.sh/", r.RequestURL)
+		assert.Equal(t, "https://ory.sh/", r.RequestURL)
 	})
 }