def import_(request):
"""Generates and accepts GET and POST requests for importing courses
If the request is get or an invalid POST, uses the template export/import.html, if valid then redirect to the newly
uploaded course.
"""
ctx = {}
if request.method == "GET":
# Return an empty form
ctx["form"] = ImportForm()
return render(request, "export/import.html", ctx)
else:
with atomic():
# Try to import the course
ctx["form"] = ImportForm(request.POST)
if not ctx["form"].is_valid():
# Form invalid? Send it right back to the user
return render(request, "export/import.html", ctx)
try:
# Attempt decode
data = decode(ctx["form"].cleaned_data["text"].replace("\r\n", "\n"))
if data is None:
raise RuntimeError("No data could be extracted from the import")
new = Course.from_dict(data, ctx["form"].cleaned_data["mode"], ctx["form"].cleaned_data["user_mode"])
return redirect(new.get_absolute_url())
except RuntimeError as e:
# Any error? Add it as an error and then show the form again
ctx["import_error"] = "Sorry, that failed to import, the error was: {}".format(e)
return render(request, "export/import.html", ctx)
