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# -*- coding: utf-8 -*-
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import os
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import csv
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import hashlib
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import hmac
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import re
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import inspect
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import itertools
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from typing import Iterable, List, Tuple
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from io import StringIO
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from codecs import getincrementalencoder
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from searx import logger, settings
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from searx.engines import Engine, OTHER_CATEGORY
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VALID_LANGUAGE_CODE = re.compile(r'^[a-z]{2,3}(-[a-zA-Z]{2})?$')
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logger = logger.getChild('webutils')
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class UnicodeWriter:
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"""
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A CSV writer which will write rows to CSV file "f",
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which is encoded in the given encoding.
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"""
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def __init__(self, f, dialect=csv.excel, encoding="utf-8", **kwds):
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# Redirect output to a queue
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self.queue = StringIO()
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self.writer = csv.writer(self.queue, dialect=dialect, **kwds)
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self.stream = f
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self.encoder = getincrementalencoder(encoding)()
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def writerow(self, row):
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self.writer.writerow(row)
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# Fetch UTF-8 output from the queue ...
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data = self.queue.getvalue()
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data = data.strip('\x00')
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# ... and reencode it into the target encoding
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data = self.encoder.encode(data)
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# write to the target stream
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self.stream.write(data.decode())
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# empty queue
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self.queue.truncate(0)
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def writerows(self, rows):
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for row in rows:
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self.writerow(row)
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def get_themes(templates_path):
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"""Returns available themes list."""
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themes = os.listdir(templates_path)
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if '__common__' in themes:
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themes.remove('__common__')
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return themes
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def get_static_files(static_path):
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static_files = set()
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static_path_length = len(static_path) + 1
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for directory, _, files in os.walk(static_path):
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for filename in files:
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f = os.path.join(directory[static_path_length:], filename)
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static_files.add(f)
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return static_files
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def get_result_templates(templates_path):
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result_templates = set()
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templates_path_length = len(templates_path) + 1
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for directory, _, files in os.walk(templates_path):
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if directory.endswith('result_templates'):
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for filename in files:
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f = os.path.join(directory[templates_path_length:], filename)
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result_templates.add(f)
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return result_templates
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def new_hmac(secret_key, url):
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return hmac.new(secret_key.encode(), url, hashlib.sha256).hexdigest()
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def is_hmac_of(secret_key, value, hmac_to_check):
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hmac_of_value = new_hmac(secret_key, value)
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return len(hmac_of_value) == len(hmac_to_check) and hmac.compare_digest(hmac_of_value, hmac_to_check)
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def prettify_url(url, max_length=74):
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if len(url) > max_length:
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chunk_len = int(max_length / 2 + 1)
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return '{0}[...]{1}'.format(url[:chunk_len], url[-chunk_len:])
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else:
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return url
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def highlight_content(content, query):
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if not content:
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return None
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# ignoring html contents
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# TODO better html content detection
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if content.find('<') != -1:
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return content
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if content.lower().find(query.lower()) > -1:
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query_regex = '({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:
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regex_parts = []
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for chunk in query.split():
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chunk = chunk.replace('"', '')
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if len(chunk) == 0:
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continue
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elif len(chunk) == 1:
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regex_parts.append('\\W+{0}\\W+'.format(re.escape(chunk)))
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else:
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regex_parts.append('{0}'.format(re.escape(chunk)))
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query_regex = '({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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def is_flask_run_cmdline():
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"""Check if the application was started using "flask run" command line
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Inspect the callstack.
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See https://github.com/pallets/flask/blob/master/src/flask/__main__.py
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Returns:
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bool: True if the application was started using "flask run".
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"""
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frames = inspect.stack()
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if len(frames) < 2:
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return False
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return frames[-2].filename.endswith('flask/cli.py')
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DEFAULT_GROUP_NAME = 'others'
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def group_engines_in_tab(engines: Iterable[Engine]) -> List[Tuple[str, Iterable[Engine]]]:
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"""Groups an Iterable of engines by their first non tab category"""
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def get_group(eng):
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non_tab_categories = [
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c for c in eng.categories if c not in list(settings['categories_as_tabs'].keys()) + [OTHER_CATEGORY]
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]
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return non_tab_categories[0] if len(non_tab_categories) > 0 else DEFAULT_GROUP_NAME
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groups = itertools.groupby(sorted(engines, key=get_group), get_group)
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def group_sort_key(group):
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return (group[0] == DEFAULT_GROUP_NAME, group[0].lower())
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sorted_groups = sorted(((name, list(engines)) for name, engines in groups), key=group_sort_key)
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def engine_sort_key(engine):
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return (engine.about.get('language', ''), engine.name)
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return [(groupname, sorted(engines, key=engine_sort_key)) for groupname, engines in sorted_groups]
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