members/echo: don't invalidate echo key after echoing, only expiry invalidates now

jdav_web/jdav_web/settings/local.py

@@ -28,6 +28,7 @@ LJP_CONTRIBUTION_PER_DAY = 25
 # echo
 
 ECHO_PASSWORD_BIRTHDATE_FORMAT = '%d.%m.%Y'
+ECHO_GRACE_PERIOD = 30
 
 # misc
 

jdav_web/members/models.py

@@ -326,7 +326,7 @@ class Member(Person):
 
     def generate_echo_key(self):
         self.echo_key = uuid.uuid4().hex
-        self.echo_expire = timezone.now() + timezone.timedelta(days=30)
+        self.echo_expire = timezone.now() + timezone.timedelta(days=settings.ECHO_GRACE_PERIOD)
         self.echoed = False
         self.save()
         return self.echo_key

jdav_web/members/views.py

@@ -158,7 +158,9 @@ def echo(request):
                 raise ValueError(_("Invalid emergency contacts"))
             form.save()
             emergency_contacts_formset.save()
-            member.echo_key, member.echo_expire = "", timezone.now()
+            # We don't invalidate the echo key, so the user
+            # can echo again if wanted.
+            # member.echo_key, member.echo_expire = "", timezone.now()
             member.echoed = True
             member.save()
             return render_echo_success(request, member.prename)