#32 Disable file download

* refactors: attached files can only be downloaded by users with shared access
* adds hint on unshared data being unshared for compensation, ema, eco-account
* minor optical enhancement for user contact form

ema/views.py

@@ -17,7 +17,7 @@ from konova.forms import RemoveModalForm, NewDocumentForm, SimpleGeomForm, Recor
 from konova.settings import DEFAULT_GROUP, ZB_GROUP, ETS_GROUP
 from konova.utils.documents import get_document, remove_document
 from konova.utils.generators import generate_qr_code
-from konova.utils.message_templates import IDENTIFIER_REPLACED, FORM_INVALID
+from konova.utils.message_templates import IDENTIFIER_REPLACED, FORM_INVALID, DATA_UNSHARED, DATA_UNSHARED_EXPLANATION
 from konova.utils.user_checks import in_group
 
 
@@ -136,6 +136,9 @@ def detail_view(request: HttpRequest, id: str):
     sum_after_states = after_states.aggregate(Sum("surface"))["surface__sum"] or 0
     diff_states = abs(sum_before_states - sum_after_states)
 
+    if not is_data_shared:
+        messages.info(request, DATA_UNSHARED_EXPLANATION)
+
     context = {
         "obj": ema,
         "geom_form": geom_form,
@@ -343,6 +346,15 @@ def get_document_view(request: HttpRequest, doc_id: str):
 
     """
     doc = get_object_or_404(EmaDocument, id=doc_id)
+    user = request.user
+    instance = doc.instance
+    # File download only possible if related instance is shared with user
+    if not instance.users.filter(id=user.id):
+        messages.info(
+            request,
+            DATA_UNSHARED
+        )
+        return redirect("ema:detail", id=instance.id)
     return get_document(doc)