import operator import logging from difflib import SequenceMatcher from urllib.parse import urlparse from django.shortcuts import render, redirect, reverse from django.contrib.auth.decorators import login_required from django.utils.translation import gettext_lazy as _ from django.core.paginator import Paginator from django.core.validators import URLValidator from django.core.exceptions import ValidationError, ObjectDoesNotExist from django.db.models import Q, Count from django.http import HttpResponseBadRequest from books.models import Book from movies.models import Movie from games.models import Game from music.models import Album, Song, AlbumMark, SongMark from users.models import Report, User, Preference from mastodon.decorators import mastodon_request_included from users.views import home as user_home from common.models import MarkStatusEnum from common.utils import PageLinksGenerator from common.scraper import scraper_registry from common.config import * from common.searcher import ExternalSources from management.models import Announcement from django.conf import settings logger = logging.getLogger(__name__) @login_required def home(request): return user_home(request, request.user.id) @login_required def search(request): if request.method == 'GET': # test if input serach string is empty or not excluding param ?c= empty_querystring_criteria = {k: v for k, v in request.GET.items() if k != 'c'} if not len(empty_querystring_criteria): return HttpResponseBadRequest() # test if user input an URL, if so jump to URL handling function url_validator = URLValidator() input_string = request.GET.get('q', default='').strip() try: url_validator(input_string) # validation success return jump_or_scrape(request, input_string) except ValidationError as e: pass # category, book/movie/music etc category = request.GET.get("c", default='').strip().lower() # keywords, seperated by blank space # it is better not to split the keywords keywords = request.GET.get("q", default='').strip() keywords = [keywords] if keywords else '' # tag, when tag is provided there should be no keywords , for now tag = request.GET.get("tag", default='') # white space string, empty query if not (keywords or tag): return render( request, "common/search_result.html", { "items": None, } ) def book_param_handler(**kwargs): # keywords keywords = kwargs.get('keywords') # tag tag = kwargs.get('tag') query_args = [] q = Q() for keyword in keywords: q = q | Q(title__icontains=keyword) q = q | Q(subtitle__icontains=keyword) q = q | Q(orig_title__icontains=keyword) if tag: q = q & Q(book_tags__content__iexact=tag) query_args.append(q) queryset = Book.objects.filter(*query_args).distinct() def calculate_similarity(book): if keywords: # search by keywords similarity, n = 0, 0 for keyword in keywords: similarity += 1/2 * SequenceMatcher(None, keyword, book.title).quick_ratio() + 1/3 * SequenceMatcher(None, keyword, book.orig_title).quick_ratio() + 1/6 * SequenceMatcher(None, keyword, book.subtitle).quick_ratio() n += 1 book.similarity = similarity / n elif tag: # search by single tag book.similarity = 0 if book.rating_number is None else book.rating_number else: book.similarity = 0 return book.similarity if len(queryset) > 0: ordered_queryset = sorted(queryset, key=calculate_similarity, reverse=True) else: ordered_queryset = list(queryset) return ordered_queryset def movie_param_handler(**kwargs): # keywords keywords = kwargs.get('keywords') # tag tag = kwargs.get('tag') query_args = [] q = Q() for keyword in keywords: q = q | Q(title__icontains=keyword) q = q | Q(other_title__icontains=keyword) q = q | Q(orig_title__icontains=keyword) if tag: q = q & Q(movie_tags__content__iexact=tag) query_args.append(q) queryset = Movie.objects.filter(*query_args).distinct() def calculate_similarity(movie): if keywords: # search by name similarity, n = 0, 0 for keyword in keywords: similarity += 1/2 * SequenceMatcher(None, keyword, movie.title).quick_ratio() + 1/4 * SequenceMatcher(None, keyword, movie.orig_title).quick_ratio() + 1/4 * SequenceMatcher(None, keyword, movie.other_title).quick_ratio() n += 1 movie.similarity = similarity / n elif tag: # search by single tag movie.similarity = 0 if movie.rating_number is None else movie.rating_number else: movie.similarity = 0 return movie.similarity if len(queryset) > 0: ordered_queryset = sorted(queryset, key=calculate_similarity, reverse=True) else: ordered_queryset = list(queryset) return ordered_queryset def game_param_handler(**kwargs): # keywords keywords = kwargs.get('keywords') # tag tag = kwargs.get('tag') query_args = [] q = Q() for keyword in keywords: q = q | Q(title__icontains=keyword) q = q | Q(other_title__icontains=keyword) q = q | Q(developer__icontains=keyword) q = q | Q(publisher__icontains=keyword) if tag: q = q & Q(game_tags__content__iexact=tag) query_args.append(q) queryset = Game.objects.filter(*query_args).distinct() def calculate_similarity(game): if keywords: # search by name developer_dump = ' '.join(game.developer) publisher_dump = ' '.join(game.publisher) similarity, n = 0, 0 for keyword in keywords: similarity += 1/2 * SequenceMatcher(None, keyword, game.title).quick_ratio() + 1/4 * SequenceMatcher(None, keyword, game.other_title).quick_ratio() + 1/16 * SequenceMatcher(None, keyword, developer_dump).quick_ratio() + 1/16 * SequenceMatcher(None, keyword, publisher_dump).quick_ratio() n += 1 game.similarity = similarity / n elif tag: # search by single tag game.similarity = 0 if game.rating_number is None else game.rating_number else: game.similarity = 0 return game.similarity if len(queryset) > 0: ordered_queryset = sorted(queryset, key=calculate_similarity, reverse=True) else: ordered_queryset = list(queryset) return ordered_queryset def music_param_handler(**kwargs): # keywords keywords = kwargs.get('keywords') # tag tag = kwargs.get('tag') query_args = [] q = Q() # search albums for keyword in keywords: q = q | Q(title__icontains=keyword) q = q | Q(artist__icontains=keyword) if tag: q = q & Q(album_tags__content__iexact=tag) query_args.append(q) album_queryset = Album.objects.filter(*query_args).distinct() # extra query args for songs q = Q() for keyword in keywords: q = q | Q(album__title__icontains=keyword) q = q | Q(title__icontains=keyword) q = q | Q(artist__icontains=keyword) if tag: q = q & Q(song_tags__content__iexact=tag) query_args.clear() query_args.append(q) song_queryset = Song.objects.filter(*query_args).distinct() queryset = list(album_queryset) + list(song_queryset) def calculate_similarity(music): if keywords: # search by name similarity, n = 0, 0 artist_dump = ' '.join(music.artist) for keyword in keywords: if music.__class__ == Album: similarity += 1/2 * SequenceMatcher(None, keyword, music.title).quick_ratio() \ + 1/2 * SequenceMatcher(None, keyword, artist_dump).quick_ratio() elif music.__class__ == Song: similarity += 1/2 * SequenceMatcher(None, keyword, music.title).quick_ratio() \ + 1/6 * SequenceMatcher(None, keyword, artist_dump).quick_ratio() \ + 1/6 * SequenceMatcher(None, keyword, music.album.title).quick_ratio() n += 1 music.similarity = similarity / n elif tag: # search by single tag music.similarity = 0 if music.rating_number is None else music.rating_number else: music.similarity = 0 return music.similarity if len(queryset) > 0: ordered_queryset = sorted(queryset, key=calculate_similarity, reverse=True) else: ordered_queryset = list(queryset) return ordered_queryset def all_param_handler(**kwargs): book_queryset = book_param_handler(**kwargs) movie_queryset = movie_param_handler(**kwargs) music_queryset = music_param_handler(**kwargs) game_queryset = game_param_handler(**kwargs) ordered_queryset = sorted( book_queryset + movie_queryset + music_queryset + game_queryset, key=operator.attrgetter('similarity'), reverse=True ) return ordered_queryset param_handler = { 'book': book_param_handler, 'movie': movie_param_handler, 'music': music_param_handler, 'game': game_param_handler, 'all': all_param_handler, '': all_param_handler } categories = [k for k in param_handler.keys() if not k in ['all', '']] try: queryset = param_handler[category]( keywords=keywords, tag=tag ) except KeyError as e: queryset = param_handler['all']( keywords=keywords, tag=tag ) paginator = Paginator(queryset, ITEMS_PER_PAGE) page_number = request.GET.get('page', default=1) items = paginator.get_page(page_number) items.pagination = PageLinksGenerator(PAGE_LINK_NUMBER, page_number, paginator.num_pages) for item in items: item.tag_list = item.get_tags_manager().values('content').annotate( tag_frequency=Count('content')).order_by('-tag_frequency')[:TAG_NUMBER_ON_LIST] return render( request, "common/search_result.html", { "items": items, "external_items": ExternalSources.search(category, input_string, page_number), "categories": categories, } ) else: return HttpResponseBadRequest() @login_required @mastodon_request_included def jump_or_scrape(request, url): """ 1. match url to registered scrapers 2. try to find the url in the db, if exits then jump, else scrape and jump """ # redirect to this site this_site = request.get_host() if this_site in url: return redirect(url) # match url to registerd sites matched_host = None for host in scraper_registry: if host in url: matched_host = host break if matched_host is None: # invalid url return render(request, 'common/error.html', {'msg': _("链接非法，查询失败")}) else: scraper = scraper_registry[matched_host] try: # raise ObjectDoesNotExist effective_url = scraper.get_effective_url(url) entity = scraper.data_class.objects.get(source_url=effective_url) # if exists then jump to detail page return redirect(entity) except ObjectDoesNotExist: # scrape if not exists try: scraper.scrape(url) form = scraper.save(request_user=request.user) except Exception as e: logger.error(f"Scrape Failed URL: {url}\n{e}") if settings.DEBUG: logger.error("Expections during saving scraped data:", exc_info=e) return render(request, 'common/error.html', {'msg': _("爬取数据失败😫")}) return redirect(form.instance)