Current File : //lib/calibre/calibre/ebooks/metadata/sources/search_engines.py
#!/usr/bin/env python3
# vim:fileencoding=utf-8
# License: GPLv3 Copyright: 2017, Kovid Goyal <kovid at kovidgoyal.net>
from __future__ import absolute_import, division, print_function, unicode_literals
import json
import re
import time
from collections import defaultdict, namedtuple
try:
from urllib.parse import parse_qs, quote_plus, urlencode, unquote
except ImportError:
from urlparse import parse_qs
from urllib import quote_plus, urlencode, unquote
from lxml import etree
from calibre import browser as _browser, prints, random_user_agent
from calibre.utils.monotonic import monotonic
from calibre.utils.random_ua import accept_header_for_ua
current_version = (1, 0, 9)
minimum_calibre_version = (2, 80, 0)
last_visited = defaultdict(lambda: 0)
Result = namedtuple('Result', 'url title cached_url')
def tostring(elem):
return etree.tostring(elem, encoding='unicode', method='text', with_tail=False)
def browser():
ua = random_user_agent(allow_ie=False)
# ua = 'Mozilla/5.0 (Linux; Android 8.0.0; VTR-L29; rv:63.0) Gecko/20100101 Firefox/63.0'
br = _browser(user_agent=ua)
br.set_handle_gzip(True)
br.addheaders += [
('Accept', accept_header_for_ua(ua)),
('Upgrade-insecure-requests', '1'),
]
return br
def encode_query(**query):
q = {k.encode('utf-8'): v.encode('utf-8') for k, v in query.items()}
return urlencode(q).decode('utf-8')
def parse_html(raw):
try:
from html5_parser import parse
except ImportError:
# Old versions of calibre
import html5lib
return html5lib.parse(raw, treebuilder='lxml', namespaceHTMLElements=False)
else:
return parse(raw)
def query(br, url, key, dump_raw=None, limit=1, parser=parse_html, timeout=60, save_raw=None):
delta = monotonic() - last_visited[key]
if delta < limit and delta > 0:
time.sleep(delta)
try:
raw = br.open_novisit(url, timeout=timeout).read()
finally:
last_visited[key] = monotonic()
if dump_raw is not None:
with open(dump_raw, 'wb') as f:
f.write(raw)
if save_raw is not None:
save_raw(raw)
return parser(raw)
def quote_term(x):
ans = quote_plus(x.encode('utf-8'))
if isinstance(ans, bytes):
ans = ans.decode('utf-8')
return ans
# DDG + Wayback machine {{{
def ddg_term(t):
t = t.replace('"', '')
if t.lower() in {'map', 'news'}:
t = '"' + t + '"'
if t in {'OR', 'AND', 'NOT'}:
t = t.lower()
return t
def ddg_href(url):
if url.startswith('/'):
q = url.partition('?')[2]
url = parse_qs(q.encode('utf-8'))['uddg'][0].decode('utf-8')
return url
def wayback_machine_cached_url(url, br=None, log=prints, timeout=60):
q = quote_term(url)
br = br or browser()
data = query(br, 'https://archive.org/wayback/available?url=' +
q, 'wayback', parser=json.loads, limit=0.25, timeout=timeout)
try:
closest = data['archived_snapshots']['closest']
if closest['available']:
return closest['url'].replace('http:', 'https:')
except Exception:
pass
from pprint import pformat
log('Response from wayback machine:', pformat(data))
def wayback_url_processor(url):
if url.startswith('/'):
# Use original URL instead of absolutizing to wayback URL as wayback is
# slow
m = re.search('https?:', url)
if m is None:
url = 'https://web.archive.org' + url
else:
url = url[m.start():]
return url
def ddg_search(terms, site=None, br=None, log=prints, safe_search=False, dump_raw=None, timeout=60):
# https://duck.co/help/results/syntax
terms = [quote_term(ddg_term(t)) for t in terms]
if site is not None:
terms.append(quote_term(('site:' + site)))
q = '+'.join(terms)
url = 'https://duckduckgo.com/html/?q={q}&kp={kp}'.format(
q=q, kp=1 if safe_search else -1)
log('Making ddg query: ' + url)
br = br or browser()
root = query(br, url, 'ddg', dump_raw, timeout=timeout)
ans = []
for a in root.xpath('//*[@class="results"]//*[@class="result__title"]/a[@href and @class="result__a"]'):
ans.append(Result(ddg_href(a.get('href')), tostring(a), None))
return ans, url
def ddg_develop():
br = browser()
for result in ddg_search('heroes abercrombie'.split(), 'www.amazon.com', dump_raw='/t/raw.html', br=br)[0]:
if '/dp/' in result.url:
print(result.title)
print(' ', result.url)
print(' ', wayback_machine_cached_url(result.url, br))
print()
# }}}
# Bing {{{
def bing_term(t):
t = t.replace('"', '')
if t in {'OR', 'AND', 'NOT'}:
t = t.lower()
return t
def bing_url_processor(url):
return url
def bing_search(terms, site=None, br=None, log=prints, safe_search=False, dump_raw=None, timeout=60):
# http://vlaurie.com/computers2/Articles/bing_advanced_search.htm
terms = [quote_term(bing_term(t)) for t in terms]
if site is not None:
terms.append(quote_term(('site:' + site)))
q = '+'.join(terms)
url = 'https://www.bing.com/search?q={q}'.format(q=q)
log('Making bing query: ' + url)
br = br or browser()
root = query(br, url, 'bing', dump_raw, timeout=timeout)
ans = []
for li in root.xpath('//*[@id="b_results"]/li[@class="b_algo"]'):
a = li.xpath('descendant::h2/a[@href]') or li.xpath('descendant::div[@class="b_algoheader"]/a[@href]')
a = a[0]
title = tostring(a)
try:
div = li.xpath('descendant::div[@class="b_attribution" and @u]')[0]
except IndexError:
log('Ignoring {!r} as it has no cached page'.format(title))
continue
d, w = div.get('u').split('|')[-2:]
cached_url = 'https://cc.bingj.com/cache.aspx?q={q}&d={d}&mkt=en-US&setlang=en-US&w={w}'.format(
q=q, d=d, w=w)
ans.append(Result(a.get('href'), title, cached_url))
if not ans:
title = ' '.join(root.xpath('//title/text()'))
log('Failed to find any results on results page, with title:', title)
return ans, url
def bing_develop():
br = browser()
for result in bing_search('heroes abercrombie'.split(), 'www.amazon.com', dump_raw='/t/raw.html', br=br)[0]:
if '/dp/' in result.url:
print(result.title)
print(' ', result.url)
print(' ', result.cached_url)
print()
# }}}
# Google {{{
def google_term(t):
t = t.replace('"', '')
if t in {'OR', 'AND', 'NOT'}:
t = t.lower()
return t
def google_url_processor(url):
return url
def google_extract_cache_urls(raw):
if isinstance(raw, bytes):
raw = raw.decode('utf-8', 'replace')
pat = re.compile(r'\\x22(https://webcache\.googleusercontent\.com/.+?)\\x22')
upat = re.compile(r'\\\\u([0-9a-fA-F]{4})')
cache_pat = re.compile('cache:([^:]+):(.+)')
def urepl(m):
return chr(int(m.group(1), 16))
seen = set()
ans = {}
for m in pat.finditer(raw):
cache_url = upat.sub(urepl, m.group(1))
m = cache_pat.search(cache_url)
cache_id, src_url = m.group(1), m.group(2)
if cache_id in seen:
continue
seen.add(cache_id)
src_url = src_url.split('+')[0]
src_url = unquote(src_url)
ans[src_url] = cache_url
return ans
def google_parse_results(root, raw, log=prints):
cache_url_map = google_extract_cache_urls(raw)
# print('\n'.join(cache_url_map))
ans = []
for div in root.xpath('//*[@id="search"]//*[@id="rso"]//*[@class="kWxLod"]'):
try:
a = div.xpath('descendant::a[@href]')[0]
except IndexError:
log('Ignoring div with no main result link')
continue
title = tostring(a)
src_url = a.get('href')
if src_url in cache_url_map:
cached_url = cache_url_map[src_url]
else:
try:
c = div.xpath('descendant::*[@role="menuitem"]//a[@class="fl"]')[0]
except IndexError:
log('Ignoring {!r} as it has no cached page'.format(title))
continue
cached_url = c.get('href')
ans.append(Result(a.get('href'), title, cached_url))
if not ans:
title = ' '.join(root.xpath('//title/text()'))
log('Failed to find any results on results page, with title:', title)
return ans
def google_search(terms, site=None, br=None, log=prints, safe_search=False, dump_raw=None, timeout=60):
terms = [quote_term(google_term(t)) for t in terms]
if site is not None:
terms.append(quote_term(('site:' + site)))
q = '+'.join(terms)
url = 'https://www.google.com/search?q={q}'.format(q=q)
log('Making google query: ' + url)
br = br or browser()
r = []
root = query(br, url, 'google', dump_raw, timeout=timeout, save_raw=r.append)
return google_parse_results(root, r[0], log=log), url
def google_develop(search_terms='1423146786', raw_from=''):
if raw_from:
with open(raw_from, 'rb') as f:
raw = f.read()
results = google_parse_results(parse_html(raw), raw)
else:
br = browser()
results = google_search(search_terms.split(), 'www.amazon.com', dump_raw='/t/raw.html', br=br)[0]
for result in results:
if '/dp/' in result.url:
print(result.title)
print(' ', result.url)
print(' ', result.cached_url)
print()
# }}}
def resolve_url(url):
prefix, rest = url.partition(':')[::2]
if prefix == 'bing':
return bing_url_processor(rest)
if prefix == 'wayback':
return wayback_url_processor(rest)
return url
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