[fix] revise google images engine

"""

 Google (Images)

# SPDX-License-Identifier: AGPL-3.0-or-later

"""Google (Images)

:website:     https://images.google.com (redirected to subdomain www.)

:provide-api: yes (https://developers.google.com/custom-search/)

:using-api:   not the offical, since it needs registration to another service

:results:     HTML

:stable:      no

:template:    images.html

:parse:       url, title, content, source, thumbnail_src, img_src

For detailed description of the *REST-full* API see: `Query Parameter

Definitions`_.

.. _admonition:: Content-Security-Policy (CSP)

   This engine needs to allow images from the `data URLs`_ (prefixed with the

   ``data:` scheme).::

 @website     https://www.google.com

 @provide-api yes (https://developers.google.com/custom-search/)

     Header set Content-Security-Policy "img-src 'self' data: ;"

.. _Query Parameter Definitions:

   https://developers.google.com/custom-search/docs/xml_results#WebSearch_Query_Parameter_Definitions

 @using-api   no

 @results     HTML chunks with JSON inside

 @stable      no

 @parse       url, title, img_src

"""

from datetime import date, timedelta

from json import loads

from lxml import html

from searx.url_utils import urlencode

from flask_babel import gettext

from searx import logger

from searx.url_utils import urlencode, urlparse

from searx.utils import eval_xpath

from searx.engines.xpath import extract_text

# pylint: disable=unused-import

from searx.engines.google import (

    supported_languages_url

    ,  _fetch_supported_languages

)

# pylint: enable=unused-import

from searx.engines.google import (

    get_lang_country

    , google_domains

    , time_range_dict

)

logger = logger.getChild('google images')

# engine dependent config

categories = ['images']

paging = True

safesearch = True

paging = False

language_support = True

use_locale_domain = True

time_range_support = True

number_of_results = 100

safesearch = True

search_url = 'https://www.google.com/search'\

    '?{query}'\

    '&tbm=isch'\

    '&yv=2'\

    '&{search_options}'

time_range_attr = "qdr:{range}"

time_range_custom_attr = "cdr:1,cd_min:{start},cd_max{end}"

time_range_dict = {'day': 'd',

                   'week': 'w',

                   'month': 'm'}

filter_mapping = {

    0 : 'images',

    1 : 'active',

    2 : 'active'

}

def scrap_out_thumbs(dom):

    """Scrap out thumbnail data from <script> tags.

    """

    ret_val = dict()

    for script in eval_xpath(dom, '//script[contains(., "_setImgSrc(")]'):

        _script = script.text

        # _setImgSrc('0','data:image\/jpeg;base64,\/9j\/4AAQSkZJR ....');

        _thumb_no, _img_data = _script[len("_setImgSrc("):-2].split(",",1)

        _thumb_no = _thumb_no.replace("'","")

        _img_data = _img_data.replace("'","")

        _img_data = _img_data.replace(r"\/", r"/")

        ret_val[_thumb_no] = _img_data.replace(r"\x3d", "=")

    return ret_val

# do search-request

def request(query, params):

    search_options = {

        'ijn': params['pageno'] - 1,

        'start': (params['pageno'] - 1) * number_of_results

    }

    """Google-Video search request"""

    language, country, lang_country = get_lang_country(

        # pylint: disable=undefined-variable

        params, supported_languages, language_aliases

    )

    subdomain = 'www.' + google_domains.get(country.upper(), 'google.com')

    query_url = 'https://'+ subdomain + '/search' + "?" + urlencode({

        'q':   query,

        'tbm': "isch",

        'hl':  lang_country,

        'lr': "lang_" + language,

        'ie': "utf8",

        'oe': "utf8",

        'num': 30,

    })

    if params['time_range'] in time_range_dict:

        search_options['tbs'] = time_range_attr.format(range=time_range_dict[params['time_range']])

    elif params['time_range'] == 'year':

        now = date.today()

        then = now - timedelta(days=365)

        start = then.strftime('%m/%d/%Y')

        end = now.strftime('%m/%d/%Y')

        search_options['tbs'] = time_range_custom_attr.format(start=start, end=end)

    if safesearch and params['safesearch']:

        search_options['safe'] = 'on'

    params['url'] = search_url.format(query=urlencode({'q': query}),

                                      search_options=urlencode(search_options))

        query_url += '&' + urlencode({'tbs': 'qdr:' + time_range_dict[params['time_range']]})

    if params['safesearch']:

        query_url += '&' + urlencode({'safe': filter_mapping[params['safesearch']]})

    params['url'] = query_url

    logger.debug("query_url --> %s", query_url)

    params['headers']['Accept-Language'] = (

        "%s,%s;q=0.8,%s;q=0.5" % (lang_country, language, language))

    logger.debug(

        "HTTP Accept-Language --> %s", params['headers']['Accept-Language'])

    params['headers']['Accept'] = (

        'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8'

        )

    #params['google_subdomain'] = subdomain

    return params

# get response from search-request

def response(resp):

    """Get response from google's search request"""

    results = []

    # detect google sorry

    resp_url = urlparse(resp.url)

    if resp_url.netloc == 'sorry.google.com' or resp_url.path == '/sorry/IndexRedirect':

        raise RuntimeWarning('sorry.google.com')

    if resp_url.path.startswith('/sorry'):

        raise RuntimeWarning(gettext('CAPTCHA required'))

    # which subdomain ?

    # subdomain = resp.search_params.get('google_subdomain')

    # convert the text to dom

    dom = html.fromstring(resp.text)

    img_bas64_map = scrap_out_thumbs(dom)

    # parse results

    for result in dom.xpath('//div[contains(@class, "rg_meta")]/text()'):

    #

    # root element::

    #     <div id="islmp" ..>

    # result div per image::

    #     <div jsmodel="tTXmib"> / <div jsaction="..." data-id="..."

    #     The data-id matches to a item in a json-data structure in::

    #         <script nonce="I+vqelcy/01CKiBJi5Z1Ow">AF_initDataCallback({key: 'ds:1', ... data:function(){return [ ...

    #     In this structure the ling to the origin PNG, JPG or whatever is given

    #     (we do not blow out the link there, you could still implement that)

    # first link per image-div contains a <img> with the data-iid for bas64 encoded image data::

    #      <img class="rg_i Q4LuWd" data-iid="0"

    # second link per image-div is the target link::

    #      <a class="VFACy kGQAp" href="https://en.wikipedia.org/wiki/The_Sacrament_of_the_Last_Supper">

    # the second link also contains two div tags with the *description* and *publisher*::

    #      <div class="WGvvNb">The Sacrament of the Last Supper ...</div>

    #      <div class="fxgdke">en.wikipedia.org</div>

    root = eval_xpath(dom, '//div[@id="islmp"]')

    if not root:

        logger.error("did not find root element id='islmp'")

        return results

    root = root[0]

    for img_node in eval_xpath(root, './/img[contains(@class, "rg_i")]'):

        try:

            metadata = loads(result)

            img_format = metadata.get('ity', '')

            img_width = metadata.get('ow', '')

            img_height = metadata.get('oh', '')

            if img_width and img_height:

                img_format += " {0}x{1}".format(img_width, img_height)

            source = metadata.get('st', '')

            source_url = metadata.get('isu', '')

            if source_url:

                source += " ({0})".format(source_url)

            results.append({'url': metadata['ru'],

                            'title': metadata['pt'],

                            'content': metadata.get('s', ''),

                            'source': source,

                            'img_format': img_format,

                            'thumbnail_src': metadata['tu'],

                            'img_src': metadata['ou'],

                            'template': 'images.html'})

        except:

            img_alt = eval_xpath(img_node, '@alt')[0]

            img_base64_id = eval_xpath(img_node, '@data-iid')

            if img_base64_id:

                img_base64_id = img_base64_id[0]

                thumbnail_src = img_bas64_map[img_base64_id]

            else:

                thumbnail_src = eval_xpath(img_node, '@src')

                if not thumbnail_src:

                    thumbnail_src = eval_xpath(img_node, '@data-src')

                if thumbnail_src:

                    thumbnail_src = thumbnail_src[0]

                else:

                    thumbnail_src = ''

            link_node = eval_xpath(img_node, '../../../a[2]')[0]

            url = eval_xpath(link_node, '@href')[0]

            pub_nodes = eval_xpath(link_node, './div/div')

            pub_descr = img_alt

            pub_source = ''

            if pub_nodes:

                pub_descr = extract_text(pub_nodes[0])

                pub_source = extract_text(pub_nodes[1])

            results.append({

                'url': url,

                'title': img_alt,

                'content': pub_descr,

                'source': pub_source,

                'img_src': url,

                # 'img_format': img_format,

                'thumbnail_src': thumbnail_src,

                'template': 'images.html'

            })

        except Exception as e:  # pylint: disable=broad-except

            logger.error(e, exc_info=True)

            #from lxml import etree

            #logger.debug(etree.tostring(img_node, pretty_print=True))

            #import pdb

            #pdb.set_trace()

            continue

    return results