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from django import forms
from django.shortcuts import render
from django.core.validators import ValidationError
from django.db import transaction
import base64
import json
from postgresqleu.confreg.util import get_authenticated_conference
from postgresqleu.util.widgets import StaticTextWidget
from postgresqleu.confreg.models import ConferenceSession
class UploadTypes:
def __init__(self):
self.types = {}
def register(self, cls):
self.types[cls.__name__] = cls
def get(self, name):
return self.types[name]
@property
def choices(self):
yield ('', '-- Select type of file to upload --')
for k, v in self.types.items():
yield k, v.name
uploadtypes = UploadTypes()
class BaseUploadType:
def __init__(self, conference, content):
self.conference = conference
self.content = content
def validate(self):
try:
self.decoded = json.loads(self.content)
except json.decoder.JSONDecodeError:
raise ValidationError('Could not parse JSON')
class VideoLinks(BaseUploadType):
name = 'Video links'
def validate(self):
super().validate()
providers = self.conference.videoproviders.split(',')
if 'sessions' not in self.decoded:
raise ValidationError('Root key "sessions" does not exist')
if not isinstance(self.decoded['sessions'], dict):
raise ValidationError('"sessions" is not a dict')
for k, v in self.decoded['sessions'].items():
try:
int(k)
except ValueError:
raise ValidationError('Session id {} is not an integer'.format(k))
if not isinstance(v, dict):
raise ValidationError('Video data for session {} is not a dict'.format(k))
for kk, vv in v.items():
if kk not in providers:
raise ValidationError('Unknown video type "{}" for session {}. Is it enabled for this conference?'.format(kk, k))
num = len(self.decoded['sessions'])
found = self.conference.conferencesession_set.filter(id__in=self.decoded['sessions'].keys()).count()
previous = self.conference.conferencesession_set.exclude(videolinks={}).exclude(id__in=self.decoded['sessions'].keys()).count()
return 'Loaded videos for {} sessions, {} were found and {} were not found and will be ignored.<br/>{} sessions already had videos but are not included in the import, and will not be overwritten.'.format(
num,
found,
num - found,
previous,
)
def execute(self):
for k, v in self.decoded['sessions'].items():
try:
s = ConferenceSession.objects.only('id', 'title', 'videolinks').get(pk=k, conference=self.conference)
for kk, vv in v.items():
if s.videolinks.get(kk, None) != vv:
s.videolinks[kk] = vv
s.save(update_fields=['videolinks'])
yield 'Set {} on {} ({}) to {}'.format(kk, s.id, s.title, vv)
else:
yield 'Unmodified video {} ({}).'.format(k, s.title)
except ConferenceSession.DoesNotExist:
yield 'Could not find session {} for this conference.'.format(k)
uploadtypes.register(VideoLinks)
class UploadForm(forms.Form):
resourcetype = forms.ChoiceField(choices=uploadtypes.choices, label='Type', required=False)
f = forms.FileField(label='File', required=False, help_text='File to upload (JSON format)')
data = forms.CharField(widget=forms.HiddenInput, required=False)
status = forms.CharField(widget=StaticTextWidget, required=False)
def __init__(self, conference, *args, **kwargs):
self.conference = conference
self.statusstring = None
self.persistentdata = None
super().__init__(*args, **kwargs)
if 'data' not in kwargs:
self.stage = 0
elif kwargs['data'].get('submit', None) == 'Upload file':
self.stage = 1
else:
self.stage = 2
self.fields['f'].widget.attrs['accept'] = 'application/json'
def remove_fields(self):
if self.stage == 0:
del self.fields['status']
else:
del self.fields['resourcetype']
del self.fields['f']
def clean(self):
data = super().clean()
if self.stage == 1:
if not data.get('resourcetype', None):
self.add_error('resourcetype', 'This field is required')
return data
if not data.get('f', None):
self.add_error('f', 'A file must be uploaded')
return data
uploadtype = uploadtypes.get(data['resourcetype'])
filedata = data['f'].read()
else:
try:
j = json.loads(base64.b64decode(data['data']))
except Exception:
self.add_error('status', "Failed to parse presisted data, please start over.")
uploadtype = uploadtypes.get(j['resourcetype'])
data['resourcetype'] = j['resourcetype']
filedata = j['data'].encode()
if uploadtype is None:
self.add_error('resourcetype', 'Could not find resource type')
return data
self.upload_processor = uploadtype(self.conference, filedata)
try:
self.statusstring = self.upload_processor.validate()
except ValidationError as e:
self.add_error('f', e)
return data
self.persistentdata = base64.b64encode(json.dumps({
'resourcetype': data['resourcetype'],
'data': filedata.decode(),
}).encode()).decode()
return data
def execute(self):
return self.upload_processor.execute()
def index(request, confname):
conference = get_authenticated_conference(request, confname)
if request.method == 'POST':
form = UploadForm(conference, data=request.POST, files=request.FILES)
if form.is_valid():
if form.stage == 1:
# Ugly way, but it works. I think
form.data = {**form.data.dict(), 'status': form.statusstring, 'data': form.persistentdata}
else:
with transaction.atomic():
results = form.execute()
return render(request, 'confreg/file_upload_results.html', {
'conference': conference,
'results': list(results),
'breadcrumbs': [
('./', 'Upload file'),
],
'helplink': 'upload',
})
else:
form.stage = 0
else:
form = UploadForm(conference)
form.remove_fields()
return render(request, 'confreg/admin_backend_form.html', {
'conference': conference,
'conference': conference,
'basetemplate': 'confreg/confadmin_base.html',
'form': form,
'savebutton': 'Upload file' if form.stage == 0 else 'Confirm and upload file',
'cancelurl': '.' if form.stage > 0 else None,
'whatverb': 'Upload',
'what': 'file',
'helplink': 'upload',
})
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