moviewyrm/bookwyrm/views/list/list.py
2022-01-26 12:02:48 -08:00

323 lines
11 KiB
Python

""" book list views"""
from typing import Optional
from urllib.parse import urlencode
from django.contrib.auth.decorators import login_required
from django.core.exceptions import PermissionDenied
from django.core.paginator import Paginator
from django.db import IntegrityError, transaction
from django.db.models import Avg, DecimalField, Q, Max
from django.db.models.functions import Coalesce
from django.http import HttpResponseBadRequest, HttpResponse
from django.shortcuts import get_object_or_404, redirect
from django.template.response import TemplateResponse
from django.urls import reverse
from django.utils.decorators import method_decorator
from django.views import View
from django.views.decorators.http import require_POST
from bookwyrm import book_search, forms, models
from bookwyrm.activitypub import ActivitypubResponse
from bookwyrm.settings import PAGE_LENGTH
from bookwyrm.views.helpers import is_api_request
# pylint: disable=no-self-use
class List(View):
"""book list page"""
def get(self, request, list_id):
"""display a book list"""
book_list = get_object_or_404(models.List, id=list_id)
book_list.raise_visible_to_user(request.user)
if is_api_request(request):
return ActivitypubResponse(book_list.to_activity(**request.GET))
query = request.GET.get("q")
suggestions = None
# sort_by shall be "order" unless a valid alternative is given
sort_by = request.GET.get("sort_by", "order")
if sort_by not in ("order", "title", "rating"):
sort_by = "order"
# direction shall be "ascending" unless a valid alternative is given
direction = request.GET.get("direction", "ascending")
if direction not in ("ascending", "descending"):
direction = "ascending"
directional_sort_by = {
"order": "order",
"title": "book__title",
"rating": "average_rating",
}[sort_by]
if direction == "descending":
directional_sort_by = "-" + directional_sort_by
items = book_list.listitem_set.prefetch_related("user", "book", "book__authors")
if sort_by == "rating":
items = items.annotate(
average_rating=Avg(
Coalesce("book__review__rating", 0.0),
output_field=DecimalField(),
)
)
items = items.filter(approved=True).order_by(directional_sort_by)
paginated = Paginator(items, PAGE_LENGTH)
if query and request.user.is_authenticated:
# search for books
suggestions = book_search.search(
query,
filters=[~Q(parent_work__editions__in=book_list.books.all())],
)
elif request.user.is_authenticated:
# just suggest whatever books are nearby
suggestions = request.user.shelfbook_set.filter(
~Q(book__in=book_list.books.all())
)
suggestions = [s.book for s in suggestions[:5]]
if len(suggestions) < 5:
suggestions += [
s.default_edition
for s in models.Work.objects.filter(
~Q(editions__in=book_list.books.all()),
).order_by("-updated_date")
][: 5 - len(suggestions)]
page = paginated.get_page(request.GET.get("page"))
embed_key = str(book_list.embed_key.hex)
embed_url = reverse("embed-list", args=[book_list.id, embed_key])
embed_url = request.build_absolute_uri(embed_url)
if request.GET:
embed_url = f"{embed_url}?{request.GET.urlencode()}"
data = {
"list": book_list,
"items": page,
"page_range": paginated.get_elided_page_range(
page.number, on_each_side=2, on_ends=1
),
"pending_count": book_list.listitem_set.filter(approved=False).count(),
"suggested_books": suggestions,
"list_form": forms.ListForm(instance=book_list),
"query": query or "",
"sort_form": forms.SortListForm(
{"direction": direction, "sort_by": sort_by}
),
"embed_url": embed_url,
}
return TemplateResponse(request, "lists/list.html", data)
@method_decorator(login_required, name="dispatch")
def post(self, request, list_id):
"""edit a list"""
book_list = get_object_or_404(models.List, id=list_id)
book_list.raise_not_editable(request.user)
form = forms.ListForm(request.POST, instance=book_list)
if not form.is_valid():
# this shouldn't happen
raise Exception(form.errors)
book_list = form.save()
if not book_list.curation == "group":
book_list.group = None
book_list.save(broadcast=False)
return redirect(book_list.local_path)
@require_POST
@login_required
def save_list(request, list_id):
"""save a list"""
book_list = get_object_or_404(models.List, id=list_id)
request.user.saved_lists.add(book_list)
return redirect("list", list_id)
@require_POST
@login_required
def unsave_list(request, list_id):
"""unsave a list"""
book_list = get_object_or_404(models.List, id=list_id)
request.user.saved_lists.remove(book_list)
return redirect("list", list_id)
@require_POST
@login_required
def delete_list(request, list_id):
"""delete a list"""
book_list = get_object_or_404(models.List, id=list_id)
# only the owner or a moderator can delete a list
book_list.raise_not_deletable(request.user)
book_list.delete()
return redirect("lists")
@require_POST
@login_required
@transaction.atomic
def add_book(request):
"""put a book on a list"""
book_list = get_object_or_404(models.List, id=request.POST.get("book_list"))
# make sure the user is allowed to submit to this list
book_list.raise_visible_to_user(request.user)
if request.user != book_list.user and book_list.curation == "closed":
raise PermissionDenied()
is_group_member = models.GroupMember.objects.filter(
group=book_list.group, user=request.user
).exists()
form = forms.ListItemForm(request.POST)
if not form.is_valid():
# this shouldn't happen, there aren't validated fields
raise Exception(form.errors)
item = form.save(commit=False)
if book_list.curation == "curated":
# make a pending entry at the end of the list
order_max = (book_list.listitem_set.aggregate(Max("order"))["order__max"]) or 0
item.approved = is_group_member or request.user == book_list.user
else:
# add the book at the latest order of approved books, before pending books
order_max = (
book_list.listitem_set.filter(approved=True).aggregate(Max("order"))[
"order__max"
]
) or 0
increment_order_in_reverse(book_list.id, order_max + 1)
item.order = order_max + 1
try:
item.save()
except IntegrityError:
# if the book is already on the list, don't flip out
pass
path = reverse("list", args=[book_list.id])
params = request.GET.copy()
params["updated"] = True
return redirect(f"{path}?{urlencode(params)}")
@require_POST
@login_required
def remove_book(request, list_id):
"""remove a book from a list"""
book_list = get_object_or_404(models.List, id=list_id)
item = get_object_or_404(models.ListItem, id=request.POST.get("item"))
item.raise_not_deletable(request.user)
with transaction.atomic():
deleted_order = item.order
item.delete()
normalize_book_list_ordering(book_list.id, start=deleted_order)
return redirect("list", list_id)
@require_POST
@login_required
def set_book_position(request, list_item_id):
"""
Action for when the list user manually specifies a list position, takes
special care with the unique ordering per list.
"""
list_item = get_object_or_404(models.ListItem, id=list_item_id)
list_item.book_list.raise_not_editable(request.user)
try:
int_position = int(request.POST.get("position"))
except ValueError:
return HttpResponseBadRequest("bad value for position. should be an integer")
if int_position < 1:
return HttpResponseBadRequest("position cannot be less than 1")
book_list = list_item.book_list
# the max position to which a book may be set is the highest order for
# books which are approved
order_max = book_list.listitem_set.filter(approved=True).aggregate(Max("order"))[
"order__max"
]
int_position = min(int_position, order_max)
original_order = list_item.order
if original_order == int_position:
# no change
return HttpResponse(status=204)
with transaction.atomic():
if original_order > int_position:
list_item.order = -1
list_item.save()
increment_order_in_reverse(book_list.id, int_position, original_order)
else:
list_item.order = -1
list_item.save()
decrement_order(book_list.id, original_order, int_position)
list_item.order = int_position
list_item.save()
return redirect("list", book_list.id)
@transaction.atomic
def increment_order_in_reverse(
book_list_id: int, start: int, end: Optional[int] = None
):
"""increase the order number for every item in a list"""
try:
book_list = models.List.objects.get(id=book_list_id)
except models.List.DoesNotExist:
return
items = book_list.listitem_set.filter(order__gte=start)
if end is not None:
items = items.filter(order__lt=end)
items = items.order_by("-order")
for item in items:
item.order += 1
item.save()
@transaction.atomic
def decrement_order(book_list_id, start, end):
"""decrement the order value for every item in a list"""
try:
book_list = models.List.objects.get(id=book_list_id)
except models.List.DoesNotExist:
return
items = book_list.listitem_set.filter(order__gt=start, order__lte=end).order_by(
"order"
)
for item in items:
item.order -= 1
item.save()
@transaction.atomic
def normalize_book_list_ordering(book_list_id, start=0, add_offset=0):
"""gives each book in a list the proper sequential order number"""
try:
book_list = models.List.objects.get(id=book_list_id)
except models.List.DoesNotExist:
return
items = book_list.listitem_set.filter(order__gt=start).order_by("order")
for i, item in enumerate(items, start):
effective_order = i + add_offset
if item.order != effective_order:
item.order = effective_order
item.save()