Add button to download all solutions and syntheses in a ZIP file

Signed-off-by: Emmy D'Anello <emmy.danello@animath.fr>

participation/views.py

@@ -733,6 +733,42 @@ class PoolUpdateTeamsView(VolunteerMixin, UpdateView):
         return self.handle_no_permission()
 
 
+class PoolDownloadView(VolunteerMixin, DetailView):
+    """
+    Download all solutions or syntheses as a ZIP archive.
+    """
+    model = Pool
+
+    def dispatch(self, request, *args, **kwargs):
+        if not request.user.is_authenticated:
+            return self.handle_no_permission()
+        if request.user.registration.is_admin or request.user.registration.is_volunteer \
+                and (self.get_object().tournament in request.user.registration.organized_tournaments.all()
+                     or request.user.registration in self.get_object().juries.all()):
+            return super().dispatch(request, *args, **kwargs)
+        return self.handle_no_permission()
+
+    def get(self, request, *args, **kwargs):
+        pool = self.get_object()
+
+        is_solution = 'solutions' in request.path
+
+        output = BytesIO()
+        zf = ZipFile(output, "w")
+        for s in (pool.solutions if is_solution else Synthesis.objects.filter(passage__pool=pool).all()):
+            zf.write("media/" + s.file.name, f"{s}.pdf")
+
+        zf.close()
+        response = HttpResponse(content_type="application/zip")
+        filename = _("Solutions for pool {pool} of tournament {tournament}.zip") \
+            if is_solution else _("Syntheses for pool {pool} of tournament {tournament}.zip")
+        filename = filename.format(pool=pool.get_letter_display() + str(pool.round), tournament=pool.tournament.name)
+        response["Content-Disposition"] = "attachment; filename=\"{filename}\"" \
+            .format(filename=filename)
+        response.write(output.getvalue())
+        return response
+
+
 class PoolAddJurysView(VolunteerMixin, FormView, DetailView):
     """
     This view lets organizers set jurys for a pool, without multiplying clicks.