[fix] yahoo url extraction

searx/engines/yahoo.py

 
 paging = True
 
+def parse_url(url_string):
+    start = url_string.find('http', url_string.find('/RU=')+1)
+    end = min(url_string.rfind('/RS'), url_string.rfind('/RK'))
+    return unquote(url_string[start:end])
 
 def request(query, params):
     offset = (params['pageno'] - 1) * 10 + 1
     dom = html.fromstring(resp.text)
 
     for result in dom.xpath(results_xpath):
-        url_string = extract_url(result.xpath(url_xpath), search_url)
-        start = url_string.find('http', url_string.find('/RU=')+1)
-        end = url_string.rfind('/RS')
-        url = unquote(url_string[start:end])
+        url = parse_url(extract_url(result.xpath(url_xpath), search_url))
         title = extract_text(result.xpath(title_xpath)[0])
         content = extract_text(result.xpath(content_xpath)[0])
         results.append({'url': url, 'title': title, 'content': content})

searx/engines/yahoo_news.py

 #!/usr/bin/env python
 
 from urllib import urlencode
-from urlparse import unquote
 from lxml import html
 from searx.engines.xpath import extract_text, extract_url
+from searx.engines.yahoo import parse_url
 
 categories = ['news']
 search_url = 'http://news.search.yahoo.com/search?{query}&b={offset}'
     dom = html.fromstring(resp.text)
 
     for result in dom.xpath(results_xpath):
-        url_string = extract_url(result.xpath(url_xpath), search_url)
-        start = url_string.find('http', url_string.find('/RU=')+1)
-        end = url_string.rfind('/RS')
-        url = unquote(url_string[start:end])
+        url = parse_url(extract_url(result.xpath(url_xpath), search_url))
         title = extract_text(result.xpath(title_xpath)[0])
         content = extract_text(result.xpath(content_xpath)[0])
         results.append({'url': url, 'title': title, 'content': content})