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							"""
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							 BTDigg (Videos, Music, Files)
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							 @website     https://btdigg.org
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							 @provide-api yes (on demand)
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							 @using-api   no
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							 @results     HTML (using search portal)
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							 @stable      no (HTML can change)
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							 @parse       url, title, content, seed, leech, magnetlink
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							"""
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							from lxml import html
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							from operator import itemgetter
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							from searx.engines.xpath import extract_text
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							from searx.url_utils import quote, urljoin
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							from searx.utils import get_torrent_size
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							# engine dependent config
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							categories = ['videos', 'music', 'files']
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							paging = True
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							# search-url
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							url = 'https://btdigg.org'
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							search_url = url + '/search?q={search_term}&p={pageno}'
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							# do search-request
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							def request(query, params):
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							    params['url'] = search_url.format(search_term=quote(query),
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							                                      pageno=params['pageno'] - 1)
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							    return params
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							# get response from search-request
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							def response(resp):
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							    results = []
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							    dom = html.fromstring(resp.text)
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							    search_res = dom.xpath('//div[@id="search_res"]/table/tr')
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							    # return empty array if nothing is found
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							    if not search_res:
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							        return []
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							    # parse results
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							    for result in search_res:
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							        link = result.xpath('.//td[@class="torrent_name"]//a')[0]
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							        href = urljoin(url, link.attrib.get('href'))
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							        title = extract_text(link)
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							        content = extract_text(result.xpath('.//pre[@class="snippet"]')[0])
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							        content = "<br />".join(content.split("\n"))
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							        filesize = result.xpath('.//span[@class="attr_val"]/text()')[0].split()[0]
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							        filesize_multiplier = result.xpath('.//span[@class="attr_val"]/text()')[0].split()[1]
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							        files = result.xpath('.//span[@class="attr_val"]/text()')[1]
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							        seed = result.xpath('.//span[@class="attr_val"]/text()')[2]
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							        # convert seed to int if possible
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							        if seed.isdigit():
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							            seed = int(seed)
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							        else:
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							            seed = 0
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							        leech = 0
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							        # convert filesize to byte if possible
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							        filesize = get_torrent_size(filesize, filesize_multiplier)
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							        # convert files to int if possible
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							        if files.isdigit():
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							            files = int(files)
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							        else:
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							            files = None
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							        magnetlink = result.xpath('.//td[@class="ttth"]//a')[0].attrib['href']
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							        # append result
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							        results.append({'url': href,
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							                        'title': title,
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							                        'content': content,
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							                        'seed': seed,
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							                        'leech': leech,
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							                        'filesize': filesize,
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							                        'files': files,
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							                        'magnetlink': magnetlink,
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							                        'template': 'torrent.html'})
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							    # return results sorted by seeder
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							    return sorted(results, key=itemgetter('seed'), reverse=True)
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