searxng/searx/utils.py

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import cStringIO
import csv
import os
import re
from babel.dates import format_date
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from codecs import getincrementalencoder
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from HTMLParser import HTMLParser
from random import choice
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from searx.version import VERSION_STRING
from searx import settings
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from searx import logger
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logger = logger.getChild('utils')
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ua_versions = ('40.0',
'41.0',
'42.0',
'43.0',
'44.0',
'45.0',
'46.0',
'47.0')
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ua_os = ('Windows NT 6.3; WOW64',
'X11; Linux x86_64',
'X11; Linux x86')
ua = "Mozilla/5.0 ({os}; rv:{version}) Gecko/20100101 Firefox/{version}"
blocked_tags = ('script',
'style')
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def gen_useragent():
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# TODO
return ua.format(os=choice(ua_os), version=choice(ua_versions))
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def searx_useragent():
return 'searx/{searx_version} {suffix}'.format(
searx_version=VERSION_STRING,
suffix=settings['outgoing'].get('useragent_suffix', ''))
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def highlight_content(content, query):
if not content:
return None
# ignoring html contents
# TODO better html content detection
if content.find('<') != -1:
return content
query = query.decode('utf-8')
if content.lower().find(query.lower()) > -1:
query_regex = u'({0})'.format(re.escape(query))
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content = re.sub(query_regex, '<span class="highlight">\\1</span>',
content, flags=re.I | re.U)
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else:
regex_parts = []
for chunk in query.split():
if len(chunk) == 1:
regex_parts.append(u'\W+{0}\W+'.format(re.escape(chunk)))
else:
regex_parts.append(u'{0}'.format(re.escape(chunk)))
query_regex = u'({0})'.format('|'.join(regex_parts))
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content = re.sub(query_regex, '<span class="highlight">\\1</span>',
content, flags=re.I | re.U)
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return content
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class HTMLTextExtractor(HTMLParser):
def __init__(self):
HTMLParser.__init__(self)
self.result = []
self.tags = []
def handle_starttag(self, tag, attrs):
self.tags.append(tag)
def handle_endtag(self, tag):
if not self.tags:
return
if tag != self.tags[-1]:
raise Exception("invalid html")
self.tags.pop()
def is_valid_tag(self):
return not self.tags or self.tags[-1] not in blocked_tags
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def handle_data(self, d):
if not self.is_valid_tag():
return
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self.result.append(d)
def handle_charref(self, number):
if not self.is_valid_tag():
return
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if number[0] in (u'x', u'X'):
codepoint = int(number[1:], 16)
else:
codepoint = int(number)
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self.result.append(unichr(codepoint))
def handle_entityref(self, name):
if not self.is_valid_tag():
return
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# codepoint = htmlentitydefs.name2codepoint[name]
# self.result.append(unichr(codepoint))
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self.result.append(name)
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def get_text(self):
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return u''.join(self.result).strip()
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def html_to_text(html):
html = html.replace('\n', ' ')
html = ' '.join(html.split())
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s = HTMLTextExtractor()
s.feed(html)
return s.get_text()
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class UnicodeWriter:
"""
A CSV writer which will write rows to CSV file "f",
which is encoded in the given encoding.
"""
def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
# Redirect output to a queue
self.queue = cStringIO.StringIO()
self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
self.stream = f
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self.encoder = getincrementalencoder(encoding)()
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def writerow(self, row):
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unicode_row = []
for col in row:
if type(col) == str or type(col) == unicode:
unicode_row.append(col.encode('utf-8').strip())
else:
unicode_row.append(col)
self.writer.writerow(unicode_row)
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# Fetch UTF-8 output from the queue ...
data = self.queue.getvalue()
data = data.decode("utf-8")
# ... and reencode it into the target encoding
data = self.encoder.encode(data)
# write to the target stream
self.stream.write(data)
# empty queue
self.queue.truncate(0)
def writerows(self, rows):
for row in rows:
self.writerow(row)
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def get_themes(root):
"""Returns available themes list."""
static_path = os.path.join(root, 'static')
templates_path = os.path.join(root, 'templates')
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themes = os.listdir(os.path.join(static_path, 'themes'))
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return static_path, templates_path, themes
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def get_static_files(base_path):
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base_path = os.path.join(base_path, 'static')
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static_files = set()
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base_path_length = len(base_path) + 1
for directory, _, files in os.walk(base_path):
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for filename in files:
f = os.path.join(directory[base_path_length:], filename)
static_files.add(f)
return static_files
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def get_result_templates(base_path):
base_path = os.path.join(base_path, 'templates')
result_templates = set()
base_path_length = len(base_path) + 1
for directory, _, files in os.walk(base_path):
if directory.endswith('result_templates'):
for filename in files:
f = os.path.join(directory[base_path_length:], filename)
result_templates.add(f)
return result_templates
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def format_date_by_locale(date, locale_string):
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# strftime works only on dates after 1900
if date.year <= 1900:
return date.isoformat().split('T')[0]
if locale_string == 'all':
locale_string = settings['ui']['default_locale'] or 'en_US'
return format_date(date, locale=locale_string)
def dict_subset(d, properties):
result = {}
for k in properties:
if k in d:
result[k] = d[k]
return result
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def prettify_url(url, max_length=74):
if len(url) > max_length:
chunk_len = max_length / 2 + 1
return u'{0}[...]{1}'.format(url[:chunk_len], url[-chunk_len:])
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else:
return url
# get element in list or default value
def list_get(a_list, index, default=None):
if len(a_list) > index:
return a_list[index]
else:
return default