from collections import Counter, defaultdict, namedtuple from datetime import datetime, time, timedelta from decimal import Decimal from typing import List, Optional from celery.exceptions import MaxRetriesExceededError from django.core.exceptions import ValidationError from django.db import DatabaseError, transaction from django.db.models import Count, Exists, OuterRef, Q from django.dispatch import receiver from django.utils.timezone import make_aware, now from django.utils.translation import pgettext_lazy, ugettext as _ from django_scopes import scopes_disabled from pretix.base.i18n import language from pretix.base.models import ( CartPosition, Event, InvoiceAddress, Item, ItemBundle, ItemVariation, Seat, SeatCategoryMapping, Voucher, ) from pretix.base.models.event import SubEvent from pretix.base.models.orders import OrderFee from pretix.base.models.tax import TAXED_ZERO, TaxedPrice, TaxRule from pretix.base.reldate import RelativeDateWrapper from pretix.base.services.checkin import _save_answers from pretix.base.services.locking import LockTimeoutException, NoLockManager from pretix.base.services.pricing import get_price from pretix.base.services.tasks import ProfiledEventTask from pretix.base.settings import PERSON_NAME_SCHEMES from pretix.base.signals import validate_cart_addons from pretix.base.templatetags.rich_text import rich_text from pretix.celery_app import app from pretix.presale.signals import ( checkout_confirm_messages, fee_calculation_for_cart, ) class CartError(Exception): def __init__(self, *args): msg = args[0] msgargs = args[1] if len(args) > 1 else None self.args = args if msgargs: msg = _(msg) % msgargs else: msg = _(msg) super().__init__(msg) error_messages = { 'busy': _('We were not able to process your request completely as the ' 'server was too busy. Please try again.'), 'empty': _('You did not select any products.'), 'unknown_position': _('Unknown cart position.'), 'subevent_required': pgettext_lazy('subevent', 'No date was specified.'), 'not_for_sale': _('You selected a product which is not available for sale.'), 'unavailable': _('Some of the products you selected are no longer available. ' 'Please see below for details.'), 'in_part': _('Some of the products you selected are no longer available in ' 'the quantity you selected. Please see below for details.'), 'max_items': _("You cannot select more than %s items per order."), 'max_items_per_product': _("You cannot select more than %(max)s items of the product %(product)s."), 'min_items_per_product': _("You need to select at least %(min)s items of the product %(product)s."), 'min_items_per_product_removed': _("We removed %(product)s from your cart as you can not buy less than " "%(min)s items of it."), 'not_started': _('The presale period for this event has not yet started.'), 'ended': _('The presale period for this event has ended.'), 'some_subevent_not_started': _('The presale period for this event has not yet started. The affected positions ' 'have been removed from your cart.'), 'some_subevent_ended': _('The presale period for one of the events in your cart has ended. The affected ' 'positions have been removed from your cart.'), 'price_too_high': _('The entered price is to high.'), 'voucher_invalid': _('This voucher code is not known in our database.'), 'voucher_redeemed': _('This voucher code has already been used the maximum number of times allowed.'), 'voucher_redeemed_cart': _('This voucher code is currently locked since it is already contained in a cart. This ' 'might mean that someone else is redeeming this voucher right now, or that you tried ' 'to redeem it before but did not complete the checkout process. You can try to use it ' 'again in %d minutes.'), 'voucher_redeemed_partial': _('This voucher code can only be redeemed %d more times.'), 'voucher_double': _('You already used this voucher code. Remove the associated line from your ' 'cart if you want to use it for a different product.'), 'voucher_expired': _('This voucher is expired.'), 'voucher_invalid_item': _('This voucher is not valid for this product.'), 'voucher_item_not_available': _( 'Your voucher is valid for a product that is currently not for sale.'), 'voucher_invalid_subevent': pgettext_lazy('subevent', 'This voucher is not valid for this event date.'), 'voucher_required': _('You need a valid voucher code to order this product.'), 'inactive_subevent': pgettext_lazy('subevent', 'The selected event date is not active.'), 'addon_invalid_base': _('You can not select an add-on for the selected product.'), 'addon_duplicate_item': _('You can not select two variations of the same add-on product.'), 'addon_max_count': _('You can select at most %(max)s add-ons from the category %(cat)s for the product %(base)s.'), 'addon_min_count': _('You need to select at least %(min)s add-ons from the category %(cat)s for the ' 'product %(base)s.'), 'addon_only': _('One of the products you selected can only be bought as an add-on to another project.'), 'bundled_only': _('One of the products you selected can only be bought part of a bundle.'), 'seat_required': _('You need to select a specific seat.'), 'seat_invalid': _('Please select a valid seat.'), 'seat_forbidden': _('You can not select a seat for this position.'), 'seat_unavailable': _('The seat you selected has already been taken. Please select a different seat.'), 'seat_multiple': _('You can not select the same seat multiple times.'), } class CartManager: AddOperation = namedtuple('AddOperation', ('count', 'item', 'variation', 'price', 'voucher', 'quotas', 'addon_to', 'subevent', 'includes_tax', 'bundled', 'seat')) RemoveOperation = namedtuple('RemoveOperation', ('position',)) ExtendOperation = namedtuple('ExtendOperation', ('position', 'count', 'item', 'variation', 'price', 'voucher', 'quotas', 'subevent', 'seat')) order = { RemoveOperation: 10, ExtendOperation: 20, AddOperation: 30 } def __init__(self, event: Event, cart_id: str, invoice_address: InvoiceAddress=None, widget_data=None, sales_channel='web'): self.event = event self.cart_id = cart_id self.now_dt = now() self._operations = [] self._quota_diff = Counter() self._voucher_use_diff = Counter() self._items_cache = {} self._subevents_cache = {} self._variations_cache = {} self._seated_cache = {} self._expiry = None self.invoice_address = invoice_address self._widget_data = widget_data or {} self._sales_channel = sales_channel @property def positions(self): return CartPosition.objects.filter( Q(cart_id=self.cart_id) & Q(event=self.event) ).select_related('item', 'subevent') def _is_seated(self, item, subevent): if (item, subevent) not in self._seated_cache: self._seated_cache[item, subevent] = item.seat_category_mappings.filter(subevent=subevent).exists() return self._seated_cache[item, subevent] def _calculate_expiry(self): self._expiry = self.now_dt + timedelta(minutes=self.event.settings.get('reservation_time', as_type=int)) def _check_presale_dates(self): if self.event.presale_start and self.now_dt < self.event.presale_start: raise CartError(error_messages['not_started']) if self.event.presale_has_ended: raise CartError(error_messages['ended']) if not self.event.has_subevents: tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper) if tlv: term_last = make_aware(datetime.combine( tlv.datetime(self.event).date(), time(hour=23, minute=59, second=59) ), self.event.timezone) if term_last < self.now_dt: raise CartError(error_messages['ended']) def _extend_expiry_of_valid_existing_positions(self): # Extend this user's cart session to ensure all items in the cart expire at the same time # We can extend the reservation of items which are not yet expired without risk self.positions.filter(expires__gt=self.now_dt).update(expires=self._expiry) def _delete_out_of_timeframe(self): err = None for cp in self.positions: if cp.subevent and cp.subevent.presale_start and self.now_dt < cp.subevent.presale_start: err = error_messages['some_subevent_not_started'] cp.addons.all().delete() cp.delete() if cp.subevent and cp.subevent.presale_end and self.now_dt > cp.subevent.presale_end: err = error_messages['some_subevent_ended'] cp.addons.all().delete() cp.delete() if cp.subevent: tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper) if tlv: term_last = make_aware(datetime.combine( tlv.datetime(cp.subevent).date(), time(hour=23, minute=59, second=59) ), self.event.timezone) if term_last < self.now_dt: err = error_messages['some_subevent_ended'] cp.addons.all().delete() cp.delete() return err def _update_subevents_cache(self, se_ids: List[int]): self._subevents_cache.update({ i.pk: i for i in self.event.subevents.filter(id__in=[i for i in se_ids if i and i not in self._items_cache]) }) def _update_items_cache(self, item_ids: List[int], variation_ids: List[int]): self._items_cache.update({ i.pk: i for i in self.event.items.select_related('category').prefetch_related( 'addons', 'bundles', 'addons__addon_category', 'quotas' ).annotate( has_variations=Count('variations'), ).filter( id__in=[i for i in item_ids if i and i not in self._items_cache] ) }) self._variations_cache.update({ v.pk: v for v in ItemVariation.objects.filter(item__event=self.event).prefetch_related( 'quotas' ).select_related('item', 'item__event').filter( id__in=[i for i in variation_ids if i and i not in self._variations_cache] ) }) def _check_max_cart_size(self): cartsize = self.positions.filter(addon_to__isnull=True).count() cartsize += sum([op.count for op in self._operations if isinstance(op, self.AddOperation) and not op.addon_to]) cartsize -= len([1 for op in self._operations if isinstance(op, self.RemoveOperation) if not op.position.addon_to_id]) if cartsize > int(self.event.settings.max_items_per_order): # TODO: i18n plurals raise CartError(_(error_messages['max_items']) % (self.event.settings.max_items_per_order,)) def _check_item_constraints(self, op): if isinstance(op, self.AddOperation) or isinstance(op, self.ExtendOperation): if not ( (isinstance(op, self.AddOperation) and op.addon_to == 'FAKE') or (isinstance(op, self.ExtendOperation) and op.position.is_bundled) ): if op.item.require_voucher and op.voucher is None: raise CartError(error_messages['voucher_required']) if op.item.hide_without_voucher and (op.voucher is None or not op.voucher.show_hidden_items): raise CartError(error_messages['voucher_required']) if not op.item.is_available() or (op.variation and not op.variation.active): raise CartError(error_messages['unavailable']) if self._sales_channel not in op.item.sales_channels: raise CartError(error_messages['unavailable']) if op.item.has_variations and not op.variation: raise CartError(error_messages['not_for_sale']) if op.variation and op.variation.item_id != op.item.pk: raise CartError(error_messages['not_for_sale']) if op.voucher and not op.voucher.applies_to(op.item, op.variation): raise CartError(error_messages['voucher_invalid_item']) if op.voucher and op.voucher.subevent_id and op.voucher.subevent_id != op.subevent.pk: raise CartError(error_messages['voucher_invalid_subevent']) if op.subevent and not op.subevent.active: raise CartError(error_messages['inactive_subevent']) if op.subevent and op.subevent.presale_start and self.now_dt < op.subevent.presale_start: raise CartError(error_messages['not_started']) if op.subevent and op.subevent.presale_has_ended: raise CartError(error_messages['ended']) seated = self._is_seated(op.item, op.subevent) if seated and (not op.seat or op.seat.blocked): raise CartError(error_messages['seat_invalid']) elif op.seat and not seated: raise CartError(error_messages['seat_forbidden']) elif op.seat and op.seat.product != op.item: raise CartError(error_messages['seat_invalid']) elif op.seat and op.count > 1: raise CartError('Invalid request: A seat can only be bought once.') if op.subevent: tlv = self.event.settings.get('payment_term_last', as_type=RelativeDateWrapper) if tlv: term_last = make_aware(datetime.combine( tlv.datetime(op.subevent).date(), time(hour=23, minute=59, second=59) ), self.event.timezone) if term_last < self.now_dt: raise CartError(error_messages['ended']) if isinstance(op, self.AddOperation): if op.item.category and op.item.category.is_addon and not (op.addon_to and op.addon_to != 'FAKE'): raise CartError(error_messages['addon_only']) if op.item.require_bundling and not op.addon_to == 'FAKE': raise CartError(error_messages['bundled_only']) if op.item.max_per_order or op.item.min_per_order: new_total = ( len([1 for p in self.positions if p.item_id == op.item.pk]) + sum([_op.count for _op in self._operations if isinstance(_op, self.AddOperation) and _op.item == op.item]) + op.count - len([1 for _op in self._operations if isinstance(_op, self.RemoveOperation) and _op.position.item_id == op.item.pk]) ) if op.item.max_per_order and new_total > op.item.max_per_order: raise CartError( _(error_messages['max_items_per_product']) % { 'max': op.item.max_per_order, 'product': op.item.name } ) if op.item.min_per_order and new_total < op.item.min_per_order: raise CartError( _(error_messages['min_items_per_product']) % { 'min': op.item.min_per_order, 'product': op.item.name } ) def _get_price(self, item: Item, variation: Optional[ItemVariation], voucher: Optional[Voucher], custom_price: Optional[Decimal], subevent: Optional[SubEvent], cp_is_net: bool=None, force_custom_price=False, bundled_sum=Decimal('0.00')): try: return get_price( item, variation, voucher, custom_price, subevent, custom_price_is_net=cp_is_net if cp_is_net is not None else self.event.settings.display_net_prices, invoice_address=self.invoice_address, force_custom_price=force_custom_price, bundled_sum=bundled_sum ) except ValueError as e: if str(e) == 'price_too_high': raise CartError(error_messages['price_too_high']) else: raise e def extend_expired_positions(self): expired = self.positions.filter(expires__lte=self.now_dt).select_related( 'item', 'variation', 'voucher', 'addon_to', 'addon_to__item' ).annotate( requires_seat=Exists( SeatCategoryMapping.objects.filter( Q(product=OuterRef('item')) & (Q(subevent=OuterRef('subevent')) if self.event.has_subevents else Q(subevent__isnull=True)) ) ) ).prefetch_related( 'item__quotas', 'variation__quotas', 'addons' ).order_by('-is_bundled') err = None changed_prices = {} for cp in expired: removed_positions = {op.position.pk for op in self._operations if isinstance(op, self.RemoveOperation)} if cp.pk in removed_positions or (cp.addon_to_id and cp.addon_to_id in removed_positions): continue cp.item.requires_seat = cp.requires_seat if cp.is_bundled: try: bundle = cp.addon_to.item.bundles.get(bundled_item=cp.item, bundled_variation=cp.variation) price = bundle.designated_price or 0 except ItemBundle.DoesNotExist: price = cp.price changed_prices[cp.pk] = price if not cp.includes_tax: price = self._get_price(cp.item, cp.variation, cp.voucher, price, cp.subevent, force_custom_price=True, cp_is_net=False) price = TaxedPrice(net=price.net, gross=price.net, rate=0, tax=0, name='') else: price = self._get_price(cp.item, cp.variation, cp.voucher, price, cp.subevent, force_custom_price=True) else: bundled_sum = Decimal('0.00') if not cp.addon_to_id: for bundledp in cp.addons.all(): if bundledp.is_bundled: bundledprice = changed_prices.get(bundledp.pk, bundledp.price) bundled_sum += bundledprice if not cp.includes_tax: price = self._get_price(cp.item, cp.variation, cp.voucher, cp.price, cp.subevent, cp_is_net=True, bundled_sum=bundled_sum) price = TaxedPrice(net=price.net, gross=price.net, rate=0, tax=0, name='') else: price = self._get_price(cp.item, cp.variation, cp.voucher, cp.price, cp.subevent, bundled_sum=bundled_sum) quotas = list(cp.quotas) if not quotas: self._operations.append(self.RemoveOperation(position=cp)) err = error_messages['unavailable'] continue if not cp.voucher or (not cp.voucher.allow_ignore_quota and not cp.voucher.block_quota): for quota in quotas: self._quota_diff[quota] += 1 else: quotas = [] op = self.ExtendOperation( position=cp, item=cp.item, variation=cp.variation, voucher=cp.voucher, count=1, price=price, quotas=quotas, subevent=cp.subevent, seat=cp.seat ) self._check_item_constraints(op) if cp.voucher: self._voucher_use_diff[cp.voucher] += 1 self._operations.append(op) return err def add_new_items(self, items: List[dict]): # Fetch items from the database self._update_items_cache([i['item'] for i in items], [i['variation'] for i in items]) self._update_subevents_cache([i['subevent'] for i in items if i.get('subevent')]) quota_diff = Counter() voucher_use_diff = Counter() operations = [] for i in items: if self.event.has_subevents: if not i.get('subevent'): raise CartError(error_messages['subevent_required']) subevent = self._subevents_cache[int(i.get('subevent'))] else: subevent = None # When a seat is given, we ignore the item that was given, since we can infer it from the # seat. The variation is still relevant, though! seat = None if i.get('seat'): try: seat = (subevent or self.event).seats.get(seat_guid=i.get('seat')) except Seat.DoesNotExist: raise CartError(error_messages['seat_invalid']) except Seat.MultipleObjectsReturned: raise CartError(error_messages['seat_invalid']) i['item'] = seat.product_id if i['item'] not in self._items_cache: self._update_items_cache([i['item']], [i['variation']]) # Check whether the specified items are part of what we just fetched from the database # If they are not, the user supplied item IDs which either do not exist or belong to # a different event if i['item'] not in self._items_cache or (i['variation'] and i['variation'] not in self._variations_cache): raise CartError(error_messages['not_for_sale']) item = self._items_cache[i['item']] variation = self._variations_cache[i['variation']] if i['variation'] is not None else None voucher = None if i.get('voucher'): try: voucher = self.event.vouchers.get(code__iexact=i.get('voucher').strip()) except Voucher.DoesNotExist: raise CartError(error_messages['voucher_invalid']) else: voucher_use_diff[voucher] += i['count'] # Fetch all quotas. If there are no quotas, this item is not allowed to be sold. quotas = list(item.quotas.filter(subevent=subevent) if variation is None else variation.quotas.filter(subevent=subevent)) if not quotas: raise CartError(error_messages['unavailable']) if not voucher or (not voucher.allow_ignore_quota and not voucher.block_quota): for quota in quotas: quota_diff[quota] += i['count'] else: quotas = [] # Fetch bundled items bundled = [] bundled_sum = Decimal('0.00') db_bundles = list(item.bundles.all()) self._update_items_cache([b.bundled_item_id for b in db_bundles], [b.bundled_variation_id for b in db_bundles]) for bundle in db_bundles: if bundle.bundled_item_id not in self._items_cache or ( bundle.bundled_variation_id and bundle.bundled_variation_id not in self._variations_cache ): raise CartError(error_messages['not_for_sale']) bitem = self._items_cache[bundle.bundled_item_id] bvar = self._variations_cache[bundle.bundled_variation_id] if bundle.bundled_variation_id else None bundle_quotas = list(bitem.quotas.filter(subevent=subevent) if bvar is None else bvar.quotas.filter(subevent=subevent)) if not bundle_quotas: raise CartError(error_messages['unavailable']) if not voucher or not voucher.allow_ignore_quota: for quota in bundle_quotas: quota_diff[quota] += bundle.count * i['count'] else: bundle_quotas = [] if bundle.designated_price: bprice = self._get_price(bitem, bvar, None, bundle.designated_price, subevent, force_custom_price=True, cp_is_net=False) else: bprice = TAXED_ZERO bundled_sum += bundle.designated_price * bundle.count bop = self.AddOperation( count=bundle.count, item=bitem, variation=bvar, price=bprice, voucher=None, quotas=bundle_quotas, addon_to='FAKE', subevent=subevent, includes_tax=bool(bprice.rate), bundled=[], seat=None ) self._check_item_constraints(bop) bundled.append(bop) price = self._get_price(item, variation, voucher, i.get('price'), subevent, bundled_sum=bundled_sum) op = self.AddOperation( count=i['count'], item=item, variation=variation, price=price, voucher=voucher, quotas=quotas, addon_to=False, subevent=subevent, includes_tax=bool(price.rate), bundled=bundled, seat=seat ) self._check_item_constraints(op) operations.append(op) self._quota_diff.update(quota_diff) self._voucher_use_diff += voucher_use_diff self._operations += operations def remove_item(self, pos_id: int): # TODO: We could calculate quotadiffs and voucherdiffs here, which would lead to more # flexible usages (e.g. a RemoveOperation and an AddOperation in the same transaction # could cancel each other out quota-wise). However, we are not taking this performance # penalty for now as there is currently no outside interface that would allow building # such a transaction. try: cp = self.positions.get(pk=pos_id) except CartPosition.DoesNotExist: raise CartError(error_messages['unknown_position']) self._operations.append(self.RemoveOperation(position=cp)) def clear(self): # TODO: We could calculate quotadiffs and voucherdiffs here, which would lead to more # flexible usages (e.g. a RemoveOperation and an AddOperation in the same transaction # could cancel each other out quota-wise). However, we are not taking this performance # penalty for now as there is currently no outside interface that would allow building # such a transaction. for cp in self.positions.filter(addon_to__isnull=True): self._operations.append(self.RemoveOperation(position=cp)) def set_addons(self, addons): self._update_items_cache( [a['item'] for a in addons], [a['variation'] for a in addons], ) # Prepare various containers to hold data later current_addons = defaultdict(dict) # CartPos -> currently attached add-ons input_addons = defaultdict(set) # CartPos -> add-ons according to input selected_addons = defaultdict(set) # CartPos -> final desired set of add-ons cpcache = {} # CartPos.pk -> CartPos quota_diff = Counter() # Quota -> Number of usages operations = [] available_categories = defaultdict(set) # CartPos -> Category IDs to choose from price_included = defaultdict(dict) # CartPos -> CategoryID -> bool(price is included) toplevel_cp = self.positions.filter( addon_to__isnull=True ).prefetch_related( 'addons', 'item__addons', 'item__addons__addon_category' ).select_related('item', 'variation') # Prefill some of the cache containers for cp in toplevel_cp: available_categories[cp.pk] = {iao.addon_category_id for iao in cp.item.addons.all()} price_included[cp.pk] = {iao.addon_category_id: iao.price_included for iao in cp.item.addons.all()} cpcache[cp.pk] = cp current_addons[cp] = { (a.item_id, a.variation_id): a for a in cp.addons.all() if not a.is_bundled } # Create operations, perform various checks for a in addons: # Check whether the specified items are part of what we just fetched from the database # If they are not, the user supplied item IDs which either do not exist or belong to # a different event if a['item'] not in self._items_cache or (a['variation'] and a['variation'] not in self._variations_cache): raise CartError(error_messages['not_for_sale']) # Only attach addons to things that are actually in this user's cart if a['addon_to'] not in cpcache: raise CartError(error_messages['addon_invalid_base']) cp = cpcache[a['addon_to']] item = self._items_cache[a['item']] variation = self._variations_cache[a['variation']] if a['variation'] is not None else None if item.category_id not in available_categories[cp.pk]: raise CartError(error_messages['addon_invalid_base']) # Fetch all quotas. If there are no quotas, this item is not allowed to be sold. quotas = list(item.quotas.filter(subevent=cp.subevent) if variation is None else variation.quotas.filter(subevent=cp.subevent)) if not quotas: raise CartError(error_messages['unavailable']) # Every item can be attached to very CartPosition at most once if a['item'] in ([_a[0] for _a in input_addons[cp.id]]): raise CartError(error_messages['addon_duplicate_item']) input_addons[cp.id].add((a['item'], a['variation'])) selected_addons[cp.id, item.category_id].add((a['item'], a['variation'])) if (a['item'], a['variation']) not in current_addons[cp]: # This add-on is new, add it to the cart for quota in quotas: quota_diff[quota] += 1 if price_included[cp.pk].get(item.category_id): price = TAXED_ZERO else: price = self._get_price(item, variation, None, None, cp.subevent) op = self.AddOperation( count=1, item=item, variation=variation, price=price, voucher=None, quotas=quotas, addon_to=cp, subevent=cp.subevent, includes_tax=bool(price.rate), bundled=[], seat=None ) self._check_item_constraints(op) operations.append(op) # Check constraints on the add-on combinations for cp in toplevel_cp: item = cp.item for iao in item.addons.all(): selected = selected_addons[cp.id, iao.addon_category_id] if len(selected) > iao.max_count: # TODO: Proper i18n # TODO: Proper pluralization raise CartError( error_messages['addon_max_count'], { 'base': str(item.name), 'max': iao.max_count, 'cat': str(iao.addon_category.name), } ) elif len(selected) < iao.min_count: # TODO: Proper i18n # TODO: Proper pluralization raise CartError( error_messages['addon_min_count'], { 'base': str(item.name), 'min': iao.min_count, 'cat': str(iao.addon_category.name), } ) validate_cart_addons.send( sender=self.event, addons={ (self._items_cache[s[0]], self._variations_cache[s[1]] if s[1] else None) for s in selected }, base_position=cp, iao=iao ) # Detect removed add-ons and create RemoveOperations for cp, al in current_addons.items(): for k, v in al.items(): if k not in input_addons[cp.id]: if v.expires > self.now_dt: quotas = list(v.quotas) for quota in quotas: quota_diff[quota] -= 1 op = self.RemoveOperation(position=v) operations.append(op) self._quota_diff.update(quota_diff) self._operations += operations def _get_quota_availability(self): quotas_ok = defaultdict(int) for quota, count in self._quota_diff.items(): if count <= 0: quotas_ok[quota] = 0 avail = quota.availability(self.now_dt) if avail[1] is not None and avail[1] < count: quotas_ok[quota] = min(count, avail[1]) else: quotas_ok[quota] = count return quotas_ok def _get_voucher_availability(self): vouchers_ok = {} self._voucher_depend_on_cart = set() for voucher, count in self._voucher_use_diff.items(): voucher.refresh_from_db() if voucher.valid_until is not None and voucher.valid_until < self.now_dt: raise CartError(error_messages['voucher_expired']) redeemed_in_carts = CartPosition.objects.filter( Q(voucher=voucher) & Q(event=self.event) & Q(expires__gte=self.now_dt) ).exclude(pk__in=[ op.position.id for op in self._operations if isinstance(op, self.ExtendOperation) ]) cart_count = redeemed_in_carts.count() v_avail = voucher.max_usages - voucher.redeemed - cart_count if cart_count > 0: self._voucher_depend_on_cart.add(voucher) vouchers_ok[voucher] = v_avail return vouchers_ok def _check_min_per_product(self): per_product = Counter() min_per_product = {} for p in self.positions: per_product[p.item_id] += 1 min_per_product[p.item.pk] = p.item.min_per_order for op in self._operations: if isinstance(op, self.AddOperation): per_product[op.item.pk] += op.count min_per_product[op.item.pk] = op.item.min_per_order elif isinstance(op, self.RemoveOperation): per_product[op.position.item_id] -= 1 min_per_product[op.position.item.pk] = op.position.item.min_per_order err = None for itemid, num in per_product.items(): min_p = min_per_product[itemid] if min_p and num < min_p: self._operations = [o for o in self._operations if not ( isinstance(o, self.AddOperation) and o.item.pk == itemid )] removals = [o.position.pk for o in self._operations if isinstance(o, self.RemoveOperation)] for p in self.positions: if p.item_id == itemid and p.pk not in removals: self._operations.append(self.RemoveOperation(position=p)) err = _(error_messages['min_items_per_product_removed']) % { 'min': min_p, 'product': p.item.name } return err def _perform_operations(self): vouchers_ok = self._get_voucher_availability() quotas_ok = self._get_quota_availability() err = None new_cart_positions = [] err = err or self._check_min_per_product() self._operations.sort(key=lambda a: self.order[type(a)]) seats_seen = set() for op in self._operations: if isinstance(op, self.RemoveOperation): if op.position.expires > self.now_dt: for q in op.position.quotas: quotas_ok[q] += 1 op.position.addons.all().delete() op.position.delete() elif isinstance(op, self.AddOperation) or isinstance(op, self.ExtendOperation): # Create a CartPosition for as much items as we can requested_count = quota_available_count = voucher_available_count = op.count if op.seat: if op.seat in seats_seen: err = err or error_messages['seat_multiple'] seats_seen.add(op.seat) if op.quotas: quota_available_count = min(requested_count, min(quotas_ok[q] for q in op.quotas)) if op.voucher: voucher_available_count = min(voucher_available_count, vouchers_ok[op.voucher]) if quota_available_count < 1: err = err or error_messages['unavailable'] elif quota_available_count < requested_count: err = err or error_messages['in_part'] if voucher_available_count < 1: if op.voucher in self._voucher_depend_on_cart: err = err or error_messages['voucher_redeemed_cart'] % self.event.settings.reservation_time else: err = err or error_messages['voucher_redeemed'] elif voucher_available_count < requested_count: err = err or error_messages['voucher_redeemed_partial'] % voucher_available_count available_count = min(quota_available_count, voucher_available_count) if isinstance(op, self.AddOperation): for b in op.bundled: b_quotas = list(b.quotas) if not b_quotas: if not op.voucher or not op.voucher.allow_ignore_quota: err = err or error_messages['unavailable'] available_count = 0 continue b_quota_available_count = min(available_count * b.count, min(quotas_ok[q] for q in b_quotas)) if b_quota_available_count < b.count: err = err or error_messages['unavailable'] available_count = 0 elif b_quota_available_count < available_count * b.count: err = err or error_messages['in_part'] available_count = b_quota_available_count // b.count for q in b_quotas: quotas_ok[q] -= available_count * b.count # TODO: is this correct? for q in op.quotas: quotas_ok[q] -= available_count if op.voucher: vouchers_ok[op.voucher] -= available_count if any(qa < 0 for qa in quotas_ok.values()): # Safeguard, shouldn't happen err = err or error_messages['unavailable'] available_count = 0 if isinstance(op, self.AddOperation): if op.seat and not op.seat.is_available(): available_count = 0 err = err or error_messages['seat_unavailable'] for k in range(available_count): cp = CartPosition( event=self.event, item=op.item, variation=op.variation, price=op.price.gross, expires=self._expiry, cart_id=self.cart_id, voucher=op.voucher, addon_to=op.addon_to if op.addon_to else None, subevent=op.subevent, includes_tax=op.includes_tax, seat=op.seat ) if self.event.settings.attendee_names_asked: scheme = PERSON_NAME_SCHEMES.get(self.event.settings.name_scheme) if 'attendee-name' in self._widget_data: cp.attendee_name_parts = {'_legacy': self._widget_data['attendee-name']} if any('attendee-name-{}'.format(k.replace('_', '-')) in self._widget_data for k, l, w in scheme['fields']): cp.attendee_name_parts = { k: self._widget_data.get('attendee-name-{}'.format(k.replace('_', '-')), '') for k, l, w in scheme['fields'] } if self.event.settings.attendee_emails_asked and 'email' in self._widget_data: cp.attendee_email = self._widget_data.get('email') cp._answers = {} for k, v in self._widget_data.items(): if not k.startswith('question-'): continue q = cp.item.questions.filter(ask_during_checkin=False, identifier__iexact=k[9:]).first() if q: try: cp._answers[q] = q.clean_answer(v) except ValidationError: pass if op.bundled: cp.save() # Needs to be in the database already so we have a PK that we can reference for b in op.bundled: for j in range(b.count): new_cart_positions.append(CartPosition( event=self.event, item=b.item, variation=b.variation, price=b.price.gross, expires=self._expiry, cart_id=self.cart_id, voucher=None, addon_to=cp, subevent=b.subevent, includes_tax=b.includes_tax, is_bundled=True )) new_cart_positions.append(cp) elif isinstance(op, self.ExtendOperation): if op.seat and not op.seat.is_available(ignore_cart=op.position): err = err or error_messages['seat_unavailable'] op.position.addons.all().delete() op.position.delete() elif available_count == 1: op.position.expires = self._expiry op.position.price = op.price.gross try: op.position.save(force_update=True) except DatabaseError: # Best effort... The position might have been deleted in the meantime! pass elif available_count == 0: op.position.addons.all().delete() op.position.delete() else: raise AssertionError("ExtendOperation cannot affect more than one item") for p in new_cart_positions: if getattr(p, '_answers', None): if not p.pk: # We stored some to the database already before p.save() _save_answers(p, {}, p._answers) CartPosition.objects.bulk_create([p for p in new_cart_positions if not getattr(p, '_answers', None) and not p.pk]) return err def _require_locking(self): if self._voucher_use_diff: # If any vouchers are used, we lock to make sure we don't redeem them to often return True if self._quota_diff and any(q.size is not None for q in self._quota_diff): # If any quotas are affected that are not unlimited, we lock return True if any(getattr(o, 'seat', False) for o in self._operations): return True return False def commit(self): self._check_presale_dates() self._check_max_cart_size() self._calculate_expiry() err = self._delete_out_of_timeframe() err = self.extend_expired_positions() or err lockfn = NoLockManager if self._require_locking(): lockfn = self.event.lock with lockfn() as now_dt: with transaction.atomic(): self.now_dt = now_dt self._extend_expiry_of_valid_existing_positions() err = self._perform_operations() or err if err: raise CartError(err) def update_tax_rates(event: Event, cart_id: str, invoice_address: InvoiceAddress): positions = CartPosition.objects.filter( cart_id=cart_id, event=event ).select_related('item', 'item__tax_rule') totaldiff = Decimal('0.00') for pos in positions: if not pos.item.tax_rule: continue charge_tax = pos.item.tax_rule.tax_applicable(invoice_address) if pos.includes_tax and not charge_tax: price = pos.item.tax(pos.price, base_price_is='gross').net totaldiff += price - pos.price pos.price = price pos.includes_tax = False pos.save(update_fields=['price', 'includes_tax']) elif charge_tax and not pos.includes_tax: price = pos.item.tax(pos.price, base_price_is='net').gross totaldiff += price - pos.price pos.price = price pos.includes_tax = True pos.save(update_fields=['price', 'includes_tax']) return totaldiff def get_fees(event, request, total, invoice_address, provider): from pretix.presale.views.cart import cart_session fees = [] for recv, resp in fee_calculation_for_cart.send(sender=event, request=request, invoice_address=invoice_address, total=total): if resp: fees += resp total = total + sum(f.value for f in fees) cs = cart_session(request) if cs.get('gift_cards'): gc_qs = event.organizer.accepted_gift_cards.filter(pk__in=cs.get('gift_cards'), currency=event.currency) summed = 0 for gc in gc_qs: fval = Decimal(gc.value) # TODO: don't require an extra query fval = min(fval, total - summed) if fval > 0: total -= fval summed += fval fees.append(OrderFee( fee_type=OrderFee.FEE_TYPE_GIFTCARD, internal_type='giftcard', description=gc.secret, value=-1 * fval, tax_rate=Decimal('0.00'), tax_value=Decimal('0.00'), tax_rule=TaxRule.zero() )) if provider and total != 0: provider = event.get_payment_providers().get(provider) if provider: payment_fee = provider.calculate_fee(total) if payment_fee: payment_fee_tax_rule = event.settings.tax_rate_default or TaxRule.zero() if payment_fee_tax_rule.tax_applicable(invoice_address): payment_fee_tax = payment_fee_tax_rule.tax(payment_fee, base_price_is='gross') fees.append(OrderFee( fee_type=OrderFee.FEE_TYPE_PAYMENT, value=payment_fee, tax_rate=payment_fee_tax.rate, tax_value=payment_fee_tax.tax, tax_rule=payment_fee_tax_rule )) else: fees.append(OrderFee( fee_type=OrderFee.FEE_TYPE_PAYMENT, value=payment_fee, tax_rate=Decimal('0.00'), tax_value=Decimal('0.00'), tax_rule=payment_fee_tax_rule )) return fees @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,)) def add_items_to_cart(self, event: int, items: List[dict], cart_id: str=None, locale='en', invoice_address: int=None, widget_data=None, sales_channel='web') -> None: """ Adds a list of items to a user's cart. :param event: The event ID in question :param items: A list of dicts with the keys item, variation, count, custom_price, voucher, seat ID :param cart_id: Session ID of a guest :raises CartError: On any error that occured """ with language(locale): ia = False if invoice_address: try: with scopes_disabled(): ia = InvoiceAddress.objects.get(pk=invoice_address) except InvoiceAddress.DoesNotExist: pass try: try: cm = CartManager(event=event, cart_id=cart_id, invoice_address=ia, widget_data=widget_data, sales_channel=sales_channel) cm.add_new_items(items) cm.commit() except LockTimeoutException: self.retry() except (MaxRetriesExceededError, LockTimeoutException): raise CartError(error_messages['busy']) @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,)) def remove_cart_position(self, event: Event, position: int, cart_id: str=None, locale='en') -> None: """ Removes a list of items from a user's cart. :param event: The event ID in question :param position: A cart position ID :param session: Session ID of a guest """ with language(locale): try: try: cm = CartManager(event=event, cart_id=cart_id) cm.remove_item(position) cm.commit() except LockTimeoutException: self.retry() except (MaxRetriesExceededError, LockTimeoutException): raise CartError(error_messages['busy']) @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,)) def clear_cart(self, event: Event, cart_id: str=None, locale='en') -> None: """ Removes a list of items from a user's cart. :param event: The event ID in question :param session: Session ID of a guest """ with language(locale): try: try: cm = CartManager(event=event, cart_id=cart_id) cm.clear() cm.commit() except LockTimeoutException: self.retry() except (MaxRetriesExceededError, LockTimeoutException): raise CartError(error_messages['busy']) @app.task(base=ProfiledEventTask, bind=True, max_retries=5, default_retry_delay=1, throws=(CartError,)) def set_cart_addons(self, event: Event, addons: List[dict], cart_id: str=None, locale='en', invoice_address: int=None, sales_channel='web') -> None: """ Removes a list of items from a user's cart. :param event: The event ID in question :param addons: A list of dicts with the keys addon_to, item, variation :param session: Session ID of a guest """ with language(locale): ia = False if invoice_address: try: with scopes_disabled(): ia = InvoiceAddress.objects.get(pk=invoice_address) except InvoiceAddress.DoesNotExist: pass try: try: cm = CartManager(event=event, cart_id=cart_id, invoice_address=ia, sales_channel=sales_channel) cm.set_addons(addons) cm.commit() except LockTimeoutException: self.retry() except (MaxRetriesExceededError, LockTimeoutException): raise CartError(error_messages['busy']) @receiver(checkout_confirm_messages, dispatch_uid="cart_confirm_messages") def confirm_messages(sender, *args, **kwargs): if not sender.settings.confirm_text: return {} return { 'confirm_text': rich_text(str(sender.settings.confirm_text)) }