[enh] image proxification

    default_theme : oscar # ui theme

    https_rewrite : True # Force rewrite result urls. See searx/https_rewrite.py

    useragent_suffix : "" # suffix of searx_useragent, could contain informations like an email address to the administrator

    image_proxy : False # Proxying image results through searx

engines:

  - name : wikipedia

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

    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

    return '{0}?{1}'.format(url_for('image_proxy'),

                            urlencode(dict(url=url)))

def render(template_name, override_theme=None, **kwargs):

    blocked_engines = request.cookies.get('blocked_engines', '').split(',')

    # 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)