[enh] implement swisscows engine, FIX #347

TODO: implement image engine

searx/engines/swisscows.py

@@ -0,0 +1,86 @@
+"""
+ Swisscows (Web)
+
+ @website     https://swisscows.ch
+ @provide-api no
+
+ @using-api   no
+ @results     HTML (using search portal)
+ @stable      no (HTML can change)
+ @parse       url, title, content
+"""
+
+from json import loads
+from urllib import urlencode, unquote
+import re
+
+# engine dependent config
+categories = ['general']
+paging = True
+language_support = True
+
+# search-url
+base_url = 'https://swisscows.ch/'
+search_string = '?{query}&page={page}'
+
+# regex
+regex_json = re.compile('initialData: {"Request":(.|\n)*}\]},\s*environment')
+regex_json_remove_start = re.compile('^initialData:\s*')
+regex_json_remove_end = re.compile(',\s*environment$')
+regex_img_url_remove_start = re.compile('^https?://i\.swisscows\.ch/\?link=')
+
+
+# do search-request
+def request(query, params):
+    if params['language'] == 'all':
+        ui_language = 'browser'
+        region = 'browser'
+    else:
+        region = params['language'].replace('_', '-')
+        ui_language = params['language'].split('_')[0]
+
+    search_path = search_string.format(
+        query=urlencode({'query': query,
+                         'uiLanguage': ui_language,
+                         'region': region}),
+        page=params['pageno'])
+
+    params['url'] = base_url + search_path
+
+    return params
+
+
+# get response from search-request
+def response(resp):
+    results = []
+
+    json_regex = regex_json.search(resp.content)
+
+    # check if results are returned
+    if not json_regex:
+        return []
+
+    json_raw = regex_json_remove_end.sub('', regex_json_remove_start.sub('', json_regex.group()))
+    json = loads(json_raw)
+
+    # parse normal results
+    for result in json['Results'].get('items', []):
+        # append result
+        results.append({'url': result['Url'].replace(u'\uE000', '').replace(u'\uE001', ''),
+                        'title': result['Title'].replace(u'\uE000', '').replace(u'\uE001', ''),
+                        'content': result['Description'].replace(u'\uE000', '').replace(u'\uE001', '')})
+
+    # parse images
+    for result in json.get('Images', []):
+        # decode image url
+        img_url = unquote(regex_img_url_remove_start.sub('', result['Url']))
+
+        # append result
+        results.append({'url': result['SourceUrl'],
+                        'title': result['Title'],
+                        'content': '',
+                        'img_src': img_url,
+                        'template': 'images.html'})
+
+    # return results
+    return results