Merge pull request #478 from a01200356/master

Wolfram Alpha API

searx/engines/wolframalpha_api.py

@@ -0,0 +1,60 @@
+# Wolfram Alpha (Maths)
+#
+# @website     http://www.wolframalpha.com
+# @provide-api yes (http://api.wolframalpha.com/v2/)
+#
+# @using-api   yes
+# @results     XML
+# @stable      yes
+# @parse       result
+
+from urllib import urlencode
+from lxml import etree
+
+# search-url
+base_url = 'http://api.wolframalpha.com/v2/query'
+search_url = base_url + '?appid={api_key}&{query}&format=plaintext'
+api_key = ''
+
+
+# do search-request
+def request(query, params):
+    params['url'] = search_url.format(query=urlencode({'input': query}),
+                                      api_key=api_key)
+
+    return params
+
+
+# replace private user area characters to make text legible
+def replace_pua_chars(text):
+    pua_chars = {u'\uf74c': 'd',
+                 u'\uf74d': u'\u212f',
+                 u'\uf74e': 'i',
+                 u'\uf7d9': '='}
+
+    for k, v in pua_chars.iteritems():
+        text = text.replace(k, v)
+
+    return text
+
+
+# get response from search-request
+def response(resp):
+    results = []
+
+    search_results = etree.XML(resp.content)
+
+    # return empty array if there are no results
+    if search_results.xpath('/queryresult[attribute::success="false"]'):
+        return []
+
+    # parse result
+    result = search_results.xpath('//pod[attribute::primary="true"]/subpod/plaintext')[0].text
+    result = replace_pua_chars(result)
+
+    # append result
+    # TODO: shouldn't it bind the source too?
+    results.append({'answer': result})
+
+    # return results
+    return results

searx/settings.yml

@@ -300,6 +300,14 @@ engines:
     engine : vimeo
     shortcut : vm
 
+# You can use the engine using the official stable API, but you need an API key
+# See : http://products.wolframalpha.com/api/
+#  - name : wolframalpha
+#    shortcut : wa
+#    engine : wolframalpha_api
+#    api_key: 'apikey' # required!
+#    timeout: 6.0
+
 #The blekko technology and team have joined IBM Watson! -> https://blekko.com/
 #  - name : blekko images
 #    engine : blekko_images