[fix] rewrite the google engine since Google Web Search API is about to expire

searx/engines/google.py

@@ -1,15 +1,17 @@
 ## Google (Web)
 # 
 # @website     https://www.google.com
-# @provide-api yes (https://developers.google.com/web-search/docs/), deprecated!
+# @provide-api yes (https://developers.google.com/custom-search/)
 # 
-# @using-api   yes
-# @results     JSON
-# @stable      yes (but deprecated)
-# @parse       url, title, content
+# @using-api   no
+# @results     HTML
+# @stable      no (HTML can change)
+# @parse       url, title, content, suggestion
 
 from urllib import urlencode
-from json import loads
+from urlparse import unquote,urlparse,parse_qsl
+from lxml import html
+from searx.engines.xpath import extract_text, extract_url
 
 # engine dependent config
 categories = ['general']
@@ -17,21 +19,45 @@ paging = True
 language_support = True
 
 # search-url
-url = 'https://ajax.googleapis.com/'
-search_url = url + 'ajax/services/search/web?v=2.0&start={offset}&rsz=large&safe=off&filter=off&{query}&hl={language}'  # noqa
+google_hostname = 'www.google.com'
+search_path = '/search'
+redirect_path = '/url'
+images_path = '/images'
+search_url = 'https://' + google_hostname + search_path + '?{query}&start={offset}&gbv=1'
 
+# specific xpath variables
+results_xpath= '//li[@class="g"]'
+url_xpath = './/h3/a/@href'
+title_xpath = './/h3'
+content_xpath = './/span[@class="st"]'
+suggestion_xpath = '//p[@class="_Bmc"]'
+
+images_xpath = './/div/a'
+image_url_xpath = './@href'
+image_img_src_xpath = './img/@src'
+
+# remove google-specific tracking-url
+def parse_url(url_string):
+    parsed_url = urlparse(url_string)
+    if parsed_url.netloc in [google_hostname, ''] and parsed_url.path==redirect_path:
+        query = dict(parse_qsl(parsed_url.query))
+        return query['q']
+    else:
+        return url_string
 
 # do search-request
 def request(query, params):
-    offset = (params['pageno'] - 1) * 8
+    offset = (params['pageno'] - 1) * 10
 
-    language = 'en-US'
-    if params['language'] != 'all':
-        language = params['language'].replace('_', '-')
+    if params['language'] == 'all':
+        language = 'en'
+    else:
+        language = params['language'].replace('_','-').lower()
 
     params['url'] = search_url.format(offset=offset,
-                                      query=urlencode({'q': query}),
-                                      language=language)
+                                      query=urlencode({'q': query}))
+
+    params['headers']['Accept-Language'] = language
 
     return params
 
@@ -40,18 +66,50 @@ def request(query, params):
 def response(resp):
     results = []
 
-    search_res = loads(resp.text)
-
-    # return empty array if there are no results
-    if not search_res.get('responseData', {}).get('results'):
-        return []
+    dom = html.fromstring(resp.text)
 
     # parse results
-    for result in search_res['responseData']['results']:
+    for result in dom.xpath(results_xpath):
+        title = extract_text(result.xpath(title_xpath)[0])
+        try:
+            url = parse_url(extract_url(result.xpath(url_xpath), search_url))
+            parsed_url = urlparse(url)
+            if parsed_url.netloc==google_hostname and parsed_url.path==search_path:
+                # remove the link to google news
+                continue
+
+            if parsed_url.netloc==google_hostname and parsed_url.path==images_path:
+                # images result
+                results = results + parse_images(result)
+            else:
+                # normal result
+                content = extract_text(result.xpath(content_xpath)[0])
                 # append result
-        results.append({'url': result['unescapedUrl'],
-                        'title': result['titleNoFormatting'],
-                        'content': result['content']})
+                results.append({'url': url, 
+                                'title': title, 
+                                'content': content})
+        except:
+            continue
+
+    # parse suggestion
+    for suggestion in dom.xpath(suggestion_xpath):
+        # append suggestion
+        results.append({'suggestion': extract_text(suggestion)})
 
     # return results
     return results
+
+def parse_images(result):
+    results = []
+    for image in result.xpath(images_xpath):
+        url = parse_url(extract_text(image.xpath(image_url_xpath)[0]))
+        img_src = extract_text(image.xpath(image_img_src_xpath)[0])
+        
+        # append result
+        results.append({'url': url,
+                        'title': '',
+                        'content': '',
+                        'img_src': img_src,
+                        'template': 'images.html'})
+
+    return results