implement new django-based models and loadmappkg command

src/c3nav/mapdata/views.py

@@ -1,19 +1,15 @@
 import mimetypes
 
 from django.contrib.admin.views.decorators import staff_member_required
-from django.http import Http404, HttpResponse
-from django.shortcuts import render
-
-from ..mapdata import mapmanager
+from django.http import HttpResponse
+from django.shortcuts import get_object_or_404, render
+from .models import MapSource
 
 
 @staff_member_required
-def source(request, filename):
-    source = mapmanager.sources_by_filename.get(filename)
-    if source is None:
-        raise Http404('Source does not exist')
-
-    response = HttpResponse(content_type=mimetypes.guess_type(source.src)[0])
-    with open(source.src, 'rb') as f:
-        response.write(f.read())
+def source(request, source):
+    source = get_object_or_404(MapSource, name=source)
+    response = HttpResponse(content_type=mimetypes.guess_type(source.image.name)[0])
+    for chunk in source.image.chunks():
+        response.write(chunk)
     return response