more abstract import/export interface

cookbook/integration/integration.py

@@ -1,4 +1,12 @@
 import datetime
+import uuid
+
+from io import BytesIO, StringIO
+from zipfile import ZipFile
+
+from django.core.files import File
+from django.http import HttpResponseRedirect, HttpResponse
+from django.urls import reverse
 
 from cookbook.models import Keyword
 
@@ -16,20 +24,50 @@ class Integration:
         )
 
     def do_export(self, recipes):
-        raise Exception('Method not implemented in storage integration')
+        export_zip_stream = BytesIO()
+        export_zip_obj = ZipFile(export_zip_stream, 'w')
+
+        for r in recipes:
+            if r.internal:
+                recipe_zip_stream = BytesIO()
+                recipe_zip_obj = ZipFile(recipe_zip_stream, 'w')
+
+                recipe_stream = StringIO()
+                filename, data = self.get_file_from_recipe(r)
+                recipe_stream.write(data)
+                recipe_zip_obj.writestr(filename, recipe_stream.getvalue())
+                recipe_stream.close()
+
+                try:
+                    recipe_zip_obj.write(r.image.path, 'image.png')
+                except ValueError:
+                    pass
+
+                recipe_zip_obj.close()
+                export_zip_obj.writestr(str(r.pk) + '.zip', recipe_zip_stream.getvalue())
+
+        export_zip_obj.close()
+
+        response = HttpResponse(export_zip_stream.getvalue(), content_type='application/force-download')
+        response['Content-Disposition'] = 'attachment; filename="export.zip"'
+        return response
 
     def do_import(self, files):
+        for f in files:
+            import_zip = ZipFile(f.file)
+            for z in import_zip.namelist():
+                recipe = self.get_recipe_from_file(BytesIO(import_zip.read(z)))
+                recipe.keywords.add(self.keyword)
+
+        return HttpResponseRedirect(reverse('view_search') + '?keywords=' + str(self.keyword.pk))
+
+    @staticmethod
+    def import_recipe_image(recipe, image_file):
+        recipe.image = File(image_file, name=f'{uuid.uuid4()}_{recipe.pk}.png')
+        recipe.save()
+
+    def get_recipe_from_file(self, file):
         raise Exception('Method not implemented in storage integration')
 
-    def get_recipe(self, string):
+    def get_file_from_recipe(self, recipe):
         raise Exception('Method not implemented in storage integration')
-
-    def get_export(self, recipe):
-        raise Exception('Method not implemented in storage integration')
-
-    def get_export_file(self, recipe):
-        try:
-            with open(recipe.image.path, 'rb') as img_f:
-                return img_f
-        except:
-            return None