[fix] duckduckgo images doesn't fail with countryless language

searx/engines/duckduckgo.py

 
 
 # match query's language to a region code that duckduckgo will accept
-def get_region_code(lang):
+def get_region_code(lang, lang_list=None):
     # custom fixes for languages
     if lang == 'all':
         region_code = None
         else:
             # tries to get a country code from language
             region_code = region_code[0].lower()
-            for lc in supported_languages:
+            for lc in (lang_list or supported_languages):
                 lc = lc.split('-')
                 if region_code == lc[0]:
                     region_code = lc[1].lower() + '-' + lc[0].lower()

searx/engines/duckduckgo_images.py

 
     safesearch = params['safesearch'] - 1
 
-    region_code = get_region_code(params['language'])
+    region_code = get_region_code(params['language'], lang_list=supported_languages)
     if region_code:
         params['url'] = images_url.format(
             query=urlencode({'q': query, 'l': region_code}), offset=offset, safesearch=safesearch, vqd=vqd)

tests/unit/engines/test_duckduckgo_images.py

 class TestDuckduckgoImagesEngine(SearxTestCase):
 
     def test_request(self):
+        duckduckgo_images.supported_languages = ['de-CH', 'en-US']
+
         query = 'test_query'
         dicto = defaultdict(dict)
         dicto['is_test'] = True
         self.assertIn('p=-1', params['url'])
         self.assertIn('vqd=12345', params['url'])
 
-        # test paging and safe search
+        # test paging, safe search and language
         dicto['pageno'] = 2
         dicto['safesearch'] = 2
+        dicto['language'] = 'de'
         params = duckduckgo_images.request(query, dicto)
         self.assertIn('url', params)
         self.assertIn(query, params['url'])
         self.assertIn('s=50', params['url'])
         self.assertIn('p=1', params['url'])
+        self.assertIn('ch-de', params['url'])
 
     def test_response(self):
         self.assertRaises(AttributeError, duckduckgo_images.response, None)