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