[refactor] deviantart - improve results and clean up source code

Devian's request and response forms has been changed.

- fixed title
- fixed time_range_dict to 'popular-*-***'
- use image from <noscript> if exists
- drop obsolete "http to https, remove domain sharding"
- use query URL https://www.deviantart.com/search/deviations?page=5&q=foo
- add searx/engines/deviantart.py to pylint check (test.pylint)

Error pattern::

    There DEBUG:searx:result: invalid title: {'url': 'https://www.deviantart.com/  ...

Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

Makefile

@@ -217,6 +217,7 @@ test.pylint: pyenvinstall
 		searx/preferences.py \
 		searx/testing.py \
 		searx/engines/gigablast.py \
+		searx/engines/deviantart.py \
 	)
 
 # ignored rules:
@@ -236,7 +237,7 @@ test.sh:
 
 test.pep8: pyenvinstall
 	@echo "TEST      pycodestyle (formerly pep8)"
-	$(Q)$(PY_ENV_ACT); pycodestyle --exclude='searx/static, searx/languages.py, searx/engines/gigablast.py' \
+	$(Q)$(PY_ENV_ACT); pycodestyle --exclude='searx/static, searx/languages.py, searx/engines/gigablast.py, searx/engines/deviantart.py' \
         --max-line-length=120 --ignore "E117,E252,E402,E722,E741,W503,W504,W605" searx tests
 
 test.unit: pyenvinstall

searx/engines/deviantart.py

@@ -7,75 +7,70 @@
  @using-api   no (TODO, rewrite to api)
  @results     HTML
  @stable      no (HTML can change)
- @parse       url, title, thumbnail_src, img_src
+ @parse       url, title, img_src
 
  @todo        rewrite to api
 """
+# pylint: disable=missing-function-docstring
 
-from lxml import html
-import re
 from urllib.parse import urlencode
-
+from lxml import html
 
 # engine dependent config
 categories = ['images']
 paging = True
 time_range_support = True
 
-# search-url
-base_url = 'https://www.deviantart.com/'
-search_url = base_url + 'search?page={page}&{query}'
-time_range_url = '&order={range}'
-
-time_range_dict = {'day': 11,
-                   'week': 14,
-                   'month': 15}
+time_range_dict = {
+    'day': 'popular-24-hours',
+    'week': 'popular-1-week',
+    'month': 'popular-1-month',
+    'year': 'most-recent',
+}
 
+# search-url
+base_url = 'https://www.deviantart.com'
 
-# do search-request
 def request(query, params):
-    if params['time_range'] and params['time_range'] not in time_range_dict:
-        return params
 
-    params['url'] = search_url.format(page=params['pageno'],
-                                      query=urlencode({'q': query}))
+    # https://www.deviantart.com/search/deviations?page=5&q=foo
+
+    query =  {
+        'page' : params['pageno'],
+        'q'    : query,
+    }
     if params['time_range'] in time_range_dict:
-        params['url'] += time_range_url.format(range=time_range_dict[params['time_range']])
+        query['order'] = time_range_dict[params['time_range']]
 
-    return params
+    params['url'] = base_url + '/search/deviations?' + urlencode(query)
 
+    return params
 
-# get response from search-request
 def response(resp):
-    results = []
 
-    # return empty array if a redirection code is returned
-    if resp.status_code == 302:
-        return []
+    results = []
 
     dom = html.fromstring(resp.text)
 
-    # parse results
     for row in dom.xpath('//div[contains(@data-hook, "content_row")]'):
         for result in row.xpath('./div'):
-            link = result.xpath('.//a[@data-hook="deviation_link"]')[0]
-            url = link.attrib.get('href')
-            title = link.attrib.get('title')
-            thumbnail_src = result.xpath('.//img')[0].attrib.get('src')
-            img_src = thumbnail_src
-
-            # http to https, remove domain sharding
-            thumbnail_src = re.sub(r"https?://(th|fc)\d+.", "https://th01.", thumbnail_src)
-            thumbnail_src = re.sub(r"http://", "https://", thumbnail_src)
-
-            url = re.sub(r"http://(.*)\.deviantart\.com/", "https://\\1.deviantart.com/", url)
-
-            # append result
-            results.append({'url': url,
-                            'title': title,
-                            'img_src': img_src,
-                            'thumbnail_src': thumbnail_src,
-                            'template': 'images.html'})
-
-    # return results
+
+            a_tag = result.xpath('.//a[@data-hook="deviation_link"]')[0]
+            noscript_tag = a_tag.xpath('.//noscript')
+
+            if noscript_tag:
+                img_tag = noscript_tag[0].xpath('.//img')
+            else:
+                img_tag = a_tag.xpath('.//img')
+            if not img_tag:
+                continue
+            img_tag = img_tag[0]
+
+            results.append({
+                'template': 'images.html',
+                'url': a_tag.attrib.get('href'),
+                'img_src': img_tag.attrib.get('src'),
+                'title': img_tag.attrib.get('alt'),
+            })
+
     return results