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searxng/searx/webapp.py

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#!/usr/bin/env python
'''
searx is free software: you can redistribute it and/or modify
it under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
searx is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Affero General Public License for more details.
You should have received a copy of the GNU Affero General Public License
along with searx. If not, see < http://www.gnu.org/licenses/ >.
(C) 2013- by Adam Tauber, <asciimoo@gmail.com>
'''
if __name__ == '__main__':
from sys import path
from os.path import realpath, dirname
path.append(realpath(dirname(realpath(__file__))+'/../'))
import json
import cStringIO
import os
import hashlib
from datetime import datetime, timedelta
from requests import get as http_get
from itertools import chain
from urllib import urlencode
from flask import (
Flask, request, render_template, url_for, Response, make_response,
redirect, send_from_directory
)
from flask.ext.babel import Babel, gettext, format_date
from searx import settings, searx_dir
from searx.engines import (
categories, engines, get_engines_stats, engine_shortcuts
)
from searx.utils import (
UnicodeWriter, highlight_content, html_to_text, get_themes,
get_static_files, get_result_templates, gen_useragent, dict_subset
)
from searx.version import VERSION_STRING
from searx.languages import language_codes
from searx.https_rewrite import https_url_rewrite
from searx.search import Search
from searx.query import Query
from searx.autocomplete import searx_bang, backends as autocomplete_backends
from searx import logger
try:
from pygments import highlight
from pygments.lexers import get_lexer_by_name
from pygments.formatters import HtmlFormatter
except:
logger.critical("cannot import dependency: pygments")
from sys import exit
exit(1)
logger = logger.getChild('webapp')
static_path, templates_path, themes =\
get_themes(settings['themes_path']
if settings.get('themes_path')
else searx_dir)
default_theme = settings['server'].get('default_theme', 'default')
static_files = get_static_files(searx_dir)
result_templates = get_result_templates(searx_dir)
app = Flask(
__name__,
static_folder=static_path,
template_folder=templates_path
)
app.secret_key = settings['server']['secret_key']
babel = Babel(app)
global_favicons = []
for indice, theme in enumerate(themes):
global_favicons.append([])
theme_img_path = searx_dir+"/static/themes/"+theme+"/img/icons/"
for (dirpath, dirnames, filenames) in os.walk(theme_img_path):
global_favicons[indice].extend(filenames)
cookie_max_age = 60 * 60 * 24 * 365 * 23 # 23 years
@babel.localeselector
def get_locale():
locale = request.accept_languages.best_match(settings['locales'].keys())
if settings['server'].get('default_locale'):
locale = settings['server']['default_locale']
if request.cookies.get('locale', '') in settings['locales']:
locale = request.cookies.get('locale', '')
if 'locale' in request.args\
and request.args['locale'] in settings['locales']:
locale = request.args['locale']
if 'locale' in request.form\
and request.form['locale'] in settings['locales']:
locale = request.form['locale']
return locale
# code-highlighter
@app.template_filter('code_highlighter')
def code_highlighter(codelines, language=None):
if not language:
language = 'text'
try:
# find lexer by programing language
lexer = get_lexer_by_name(language, stripall=True)
except:
# if lexer is not found, using default one
logger.debug('highlighter cannot find lexer for {0}'.format(language))
lexer = get_lexer_by_name('text', stripall=True)
html_code = ''
tmp_code = ''
last_line = None
# parse lines
for line, code in codelines:
if not last_line:
line_code_start = line
# new codeblock is detected
if last_line is not None and\
last_line + 1 != line:
# highlight last codepart
formatter = HtmlFormatter(linenos='inline',
linenostart=line_code_start)
html_code = html_code + highlight(tmp_code, lexer, formatter)
# reset conditions for next codepart
tmp_code = ''
line_code_start = line
# add codepart
tmp_code += code + '\n'
# update line
last_line = line
# highlight last codepart
formatter = HtmlFormatter(linenos='inline', linenostart=line_code_start)
html_code = html_code + highlight(tmp_code, lexer, formatter)
return html_code
def get_base_url():
if settings['server']['base_url']:
hostname = settings['server']['base_url']
else:
scheme = 'http'
if request.is_secure:
scheme = 'https'
hostname = url_for('index', _external=True, _scheme=scheme)
return hostname
def get_current_theme_name(override=None):
"""Returns theme name.
Checks in this order:
1. override
2. cookies
3. settings"""
if override and override in themes:
return override
theme_name = request.args.get('theme',
request.cookies.get('theme',
default_theme))
if theme_name not in themes:
theme_name = default_theme
return theme_name
def get_result_template(theme, template_name):
themed_path = theme + '/result_templates/' + template_name
if themed_path in result_templates:
return themed_path
return 'result_templates/' + template_name
def url_for_theme(endpoint, override_theme=None, **values):
if endpoint == 'static' and values.get('filename'):
theme_name = get_current_theme_name(override=override_theme)
filename_with_theme = "themes/{}/{}".format(theme_name, values['filename'])
if filename_with_theme in static_files:
values['filename'] = filename_with_theme
return url_for(endpoint, **values)
def image_proxify(url):
if url.startswith('//'):
url = 'https:' + url
if not settings['server'].get('image_proxy') and not request.cookies.get('image_proxy'):
return url
h = hashlib.sha256(url + settings['server']['secret_key']).hexdigest()
return '{0}?{1}'.format(url_for('image_proxy'),
urlencode(dict(url=url, h=h)))
def render(template_name, override_theme=None, **kwargs):
blocked_engines = request.cookies.get('blocked_engines', '').split(',')
autocomplete = request.cookies.get('autocomplete')
if autocomplete not in autocomplete_backends:
autocomplete = None
nonblocked_categories = (engines[e].categories
for e in engines
if e not in blocked_engines)
nonblocked_categories = set(chain.from_iterable(nonblocked_categories))
if 'categories' not in kwargs:
kwargs['categories'] = ['general']
kwargs['categories'].extend(x for x in
sorted(categories.keys())
if x != 'general'
and x in nonblocked_categories)
if 'selected_categories' not in kwargs:
kwargs['selected_categories'] = []
for arg in request.args:
if arg.startswith('category_'):
c = arg.split('_', 1)[1]
if c in categories:
kwargs['selected_categories'].append(c)
if not kwargs['selected_categories']:
cookie_categories = request.cookies.get('categories', '').split(',')
for ccateg in cookie_categories:
if ccateg in categories:
kwargs['selected_categories'].append(ccateg)
if not kwargs['selected_categories']:
kwargs['selected_categories'] = ['general']
if 'autocomplete' not in kwargs:
kwargs['autocomplete'] = autocomplete
kwargs['searx_version'] = VERSION_STRING
kwargs['method'] = request.cookies.get('method', 'POST')
# override url_for function in templates
kwargs['url_for'] = url_for_theme
kwargs['image_proxify'] = image_proxify
kwargs['get_result_template'] = get_result_template
kwargs['theme'] = get_current_theme_name(override=override_theme)
kwargs['template_name'] = template_name
return render_template(
'{}/{}'.format(kwargs['theme'], template_name), **kwargs)
@app.route('/search', methods=['GET', 'POST'])
@app.route('/', methods=['GET', 'POST'])
def index():
"""Render index page.
Supported outputs: html, json, csv, rss.
"""
if not request.args and not request.form:
return render(
'index.html',
)
try:
search = Search(request)
except:
return render(
'index.html',
)
search.results, search.suggestions,\
search.answers, search.infoboxes = search.search(request)
for result in search.results:
if not search.paging and engines[result['engine']].paging:
search.paging = True
# check if HTTPS rewrite is required
if settings['server']['https_rewrite']\
and result['parsed_url'].scheme == 'http':
result = https_url_rewrite(result)
if search.request_data.get('format', 'html') == 'html':
if 'content' in result:
result['content'] = highlight_content(result['content'],
search.query.encode('utf-8')) # noqa
result['title'] = highlight_content(result['title'],
search.query.encode('utf-8'))
else:
if 'content' in result:
result['content'] = html_to_text(result['content']).strip()
# removing html content and whitespace duplications
result['title'] = ' '.join(html_to_text(result['title'])
.strip().split())
if len(result['url']) > 74:
url_parts = result['url'][:35], result['url'][-35:]
result['pretty_url'] = u'{0}[...]{1}'.format(*url_parts)
else:
result['pretty_url'] = result['url']
# TODO, check if timezone is calculated right
if 'publishedDate' in result:
result['pubdate'] = result['publishedDate'].strftime('%Y-%m-%d %H:%M:%S%z')
if result['publishedDate'].replace(tzinfo=None) >= datetime.now() - timedelta(days=1):
timedifference = datetime.now() - result['publishedDate'].replace(tzinfo=None)
minutes = int((timedifference.seconds / 60) % 60)
hours = int(timedifference.seconds / 60 / 60)
if hours == 0:
result['publishedDate'] = gettext(u'{minutes} minute(s) ago').format(minutes=minutes) # noqa
else:
result['publishedDate'] = gettext(u'{hours} hour(s), {minutes} minute(s) ago').format(hours=hours, minutes=minutes) # noqa
else:
result['publishedDate'] = format_date(result['publishedDate'])
if search.request_data.get('format') == 'json':
return Response(json.dumps({'query': search.query,
'results': search.results}),
mimetype='application/json')
elif search.request_data.get('format') == 'csv':
csv = UnicodeWriter(cStringIO.StringIO())
keys = ('title', 'url', 'content', 'host', 'engine', 'score')
if search.results:
csv.writerow(keys)
for row in search.results:
row['host'] = row['parsed_url'].netloc
csv.writerow([row.get(key, '') for key in keys])
csv.stream.seek(0)
response = Response(csv.stream.read(), mimetype='application/csv')
cont_disp = 'attachment;Filename=searx_-_{0}.csv'.format(search.query)
response.headers.add('Content-Disposition', cont_disp)
return response
elif search.request_data.get('format') == 'rss':
response_rss = render(
'opensearch_response_rss.xml',
results=search.results,
q=search.request_data['q'],
number_of_results=len(search.results),
base_url=get_base_url()
)
return Response(response_rss, mimetype='text/xml')
return render(
'results.html',
results=search.results,
q=search.request_data['q'],
selected_categories=search.categories,
paging=search.paging,
pageno=search.pageno,
base_url=get_base_url(),
suggestions=search.suggestions,
answers=search.answers,
infoboxes=search.infoboxes,
theme=get_current_theme_name(),
favicons=global_favicons[themes.index(get_current_theme_name())]
)
@app.route('/about', methods=['GET'])
def about():
"""Render about page"""
return render(
'about.html',
)
@app.route('/autocompleter', methods=['GET', 'POST'])
def autocompleter():
"""Return autocompleter results"""
request_data = {}
# select request method
if request.method == 'POST':
request_data = request.form
else:
request_data = request.args
# set blocked engines
if request.cookies.get('blocked_engines'):
blocked_engines = request.cookies['blocked_engines'].split(',') # noqa
else:
blocked_engines = []
# parse query
query = Query(request_data.get('q', '').encode('utf-8'), blocked_engines)
query.parse_query()
# check if search query is set
if not query.getSearchQuery():
return '', 400
# run autocompleter
completer = autocomplete_backends.get(request.cookies.get('autocomplete'))
# check if valid autocompleter is selected
if not completer:
return '', 400
# parse searx specific autocompleter results like !bang
raw_results = searx_bang(query)
# normal autocompletion results only appear if max 3. searx results returned
if len(raw_results) <= 3:
# run autocompletion
raw_results.extend(completer(query.getSearchQuery()))
# parse results (write :language and !engine back to result string)
results = []
for result in raw_results:
result_query = query
result_query.changeSearchQuery(result)
# add parsed result
results.append(result_query.getFullQuery())
# return autocompleter results
if request_data.get('format') == 'x-suggestions':
return Response(json.dumps([query.query, results]),
mimetype='application/json')
else:
return Response(json.dumps(results),
mimetype='application/json')
@app.route('/preferences', methods=['GET', 'POST'])
def preferences():
"""Render preferences page.
Settings that are going to be saved as cookies."""
lang = None
image_proxy = request.cookies.get('image_proxy', settings['server'].get('image_proxy'))
if request.cookies.get('language')\
and request.cookies['language'] in (x[0] for x in language_codes):
lang = request.cookies['language']
blocked_engines = []
if request.method == 'GET':
blocked_engines = request.cookies.get('blocked_engines', '').split(',')
else: # on save
selected_categories = []
locale = None
autocomplete = ''
method = 'POST'
for pd_name, pd in request.form.items():
if pd_name.startswith('category_'):
category = pd_name[9:]
if category not in categories:
continue
selected_categories.append(category)
elif pd_name == 'locale' and pd in settings['locales']:
locale = pd
elif pd_name == 'image_proxy':
image_proxy = pd
elif pd_name == 'autocomplete':
autocomplete = pd
elif pd_name == 'language' and (pd == 'all' or
pd in (x[0] for
x in language_codes)):
lang = pd
elif pd_name == 'method':
method = pd
elif pd_name.startswith('engine_'):
engine_name = pd_name.replace('engine_', '', 1)
if engine_name in engines:
blocked_engines.append(engine_name)
elif pd_name == 'theme':
theme = pd if pd in themes else default_theme
resp = make_response(redirect(url_for('index')))
user_blocked_engines = request.cookies.get('blocked_engines', '').split(',') # noqa
if sorted(blocked_engines) != sorted(user_blocked_engines):
resp.set_cookie(
'blocked_engines', ','.join(blocked_engines),
max_age=cookie_max_age
)
if locale:
resp.set_cookie(
'locale', locale,
max_age=cookie_max_age
)
if lang:
resp.set_cookie(
'language', lang,
max_age=cookie_max_age
)
if selected_categories:
# cookie max age: 4 weeks
resp.set_cookie(
'categories', ','.join(selected_categories),
max_age=cookie_max_age
)
resp.set_cookie(
'autocomplete', autocomplete,
max_age=cookie_max_age
)
resp.set_cookie('method', method, max_age=cookie_max_age)
resp.set_cookie('image_proxy', image_proxy, max_age=cookie_max_age)
resp.set_cookie('theme', theme, max_age=cookie_max_age)
return resp
return render('preferences.html',
locales=settings['locales'],
current_locale=get_locale(),
current_language=lang or 'all',
image_proxy=image_proxy,
language_codes=language_codes,
categs=categories.items(),
blocked_engines=blocked_engines,
autocomplete_backends=autocomplete_backends,
shortcuts={y: x for x, y in engine_shortcuts.items()},
themes=themes,
theme=get_current_theme_name())
@app.route('/image_proxy', methods=['GET'])
def image_proxy():
url = request.args.get('url')
if not url:
return '', 400
h = hashlib.sha256(url + settings['server']['secret_key']).hexdigest()
if h != request.args.get('h'):
return '', 400
headers = dict_subset(request.headers, {'If-Modified-Since', 'If-None-Match'})
headers['User-Agent'] = gen_useragent()
resp = http_get(url,
stream=True,
timeout=settings['server'].get('request_timeout', 2),
headers=headers)
if resp.status_code == 304:
return '', resp.status_code
if resp.status_code != 200:
logger.debug('image-proxy: wrong response code: {0}'.format(resp.status_code))
if resp.status_code >= 400:
return '', resp.status_code
return '', 400
if not resp.headers.get('content-type', '').startswith('image/'):
logger.debug('image-proxy: wrong content-type: {0}'.format(resp.get('content-type')))
return '', 400
img = ''
chunk_counter = 0
for chunk in resp.iter_content(1024*1024):
chunk_counter += 1
if chunk_counter > 5:
return '', 502 # Bad gateway - file is too big (>5M)
img += chunk
headers = dict_subset(resp.headers, {'Content-Length', 'Length', 'Date', 'Last-Modified', 'Expires', 'Etag'})
return Response(img, mimetype=resp.headers['content-type'], headers=headers)
@app.route('/stats', methods=['GET'])
def stats():
"""Render engine statistics page."""
stats = get_engines_stats()
return render(
'stats.html',
stats=stats,
)
@app.route('/robots.txt', methods=['GET'])
def robots():
return Response("""User-agent: *
Allow: /
Allow: /about
Disallow: /stats
Disallow: /preferences
""", mimetype='text/plain')
@app.route('/opensearch.xml', methods=['GET'])
def opensearch():
method = 'post'
# chrome/chromium only supports HTTP GET....
if request.headers.get('User-Agent', '').lower().find('webkit') >= 0:
method = 'get'
ret = render('opensearch.xml',
opensearch_method=method,
host=get_base_url())
resp = Response(response=ret,
status=200,
mimetype="application/xml")
return resp
@app.route('/favicon.ico')
def favicon():
return send_from_directory(os.path.join(app.root_path,
'static/themes',
get_current_theme_name(),
'img'),
'favicon.png',
mimetype='image/vnd.microsoft.icon')
def run():
app.run(
debug=settings['server']['debug'],
use_debugger=settings['server']['debug'],
port=settings['server']['port']
)
application = app
if __name__ == "__main__":
run()
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