From 41800835f9ea82f4b5342525df1c8174eddb9efc Mon Sep 17 00:00:00 2001
From: Marc Abonce Seguin <marc-abonce@mailbox.org>
Date: Mon, 14 Sep 2020 00:06:58 -0700
Subject: [PATCH] fetch supported languages for startpage engine

---
 searx/engines/startpage.py | 69 ++++++++++++++++++++++++++++++++++----
 1 file changed, 62 insertions(+), 7 deletions(-)

diff --git a/searx/engines/startpage.py b/searx/engines/startpage.py
index 953734934..b6d0c24f7 100644
--- a/searx/engines/startpage.py
+++ b/searx/engines/startpage.py
@@ -14,9 +14,12 @@ from lxml import html
 from dateutil import parser
 from datetime import datetime, timedelta
 import re
+from unicodedata import normalize, combining
+from babel import Locale
+from babel.localedata import locale_identifiers
 from searx.engines.xpath import extract_text
 from searx.languages import language_codes
-from searx.utils import eval_xpath
+from searx.utils import eval_xpath, match_language
 
 # engine dependent config
 categories = ['general']
@@ -26,6 +29,7 @@ categories = ['general']
 
 paging = True
 language_support = True
+supported_languages_url = 'https://www.startpage.com/do/settings'
 
 # search-url
 base_url = 'https://startpage.com/'
@@ -54,12 +58,11 @@ def request(query, params):
 
     # set language if specified
     if params['language'] != 'all':
-        language = 'english'
-        for lc, _, _, lang in language_codes:
-            if lc == params['language']:
-                language = lang
-        params['data']['language'] = language
-        params['data']['lui'] = language
+        lang_code = match_language(params['language'], supported_languages, fallback=None)
+        if lang_code:
+            language_name = supported_languages[lang_code]['alias']
+            params['data']['language'] = language_name
+            params['data']['lui'] = language_name
 
     return params
 
@@ -132,3 +135,55 @@ def response(resp):
 
     # return results
     return results
+
+
+# get supported languages from their site
+def _fetch_supported_languages(resp):
+    # startpage's language selector is a mess
+    # each option has a displayed name and a value, either of which may represent the language name
+    # in the native script, the language name in English, an English transliteration of the native name,
+    # the English name of the writing script used by the language, or occasionally something else entirely.
+
+    # this cases are so special they need to be hardcoded, a couple of them are mispellings
+    language_names = {
+        'english_uk': 'en-GB',
+        'fantizhengwen': ['zh-TW', 'zh-HK'],
+        'hangul': 'ko',
+        'malayam': 'ml',
+        'norsk': 'nb',
+        'sinhalese': 'si',
+        'sudanese': 'su'
+    }
+
+    # get the English name of every language known by babel
+    language_names.update({name.lower(): lang_code for lang_code, name in Locale('en')._data['languages'].items()})
+
+    # get the native name of every language known by babel
+    for lang_code in filter(lambda lang_code: lang_code.find('_') == -1, locale_identifiers()):
+        native_name = Locale(lang_code).get_language_name().lower()
+        # add native name exactly as it is
+        language_names[native_name] = lang_code
+
+        # add "normalized" language name (i.e. français becomes francais and español becomes espanol)
+        unaccented_name = ''.join(filter(lambda c: not combining(c), normalize('NFKD', native_name)))
+        if len(unaccented_name) == len(unaccented_name.encode()):
+            # add only if result is ascii (otherwise "normalization" didn't work)
+            language_names[unaccented_name] = lang_code
+
+    dom = html.fromstring(resp.text)
+    sp_lang_names = []
+    for option in dom.xpath('//form[@id="settings-form"]//select[@name="language"]/option'):
+        sp_lang_names.append((option.get('value'), extract_text(option).lower()))
+
+    supported_languages = {}
+    for sp_option_value, sp_option_text in sp_lang_names:
+        lang_code = language_names.get(sp_option_value) or language_names.get(sp_option_text)
+        if isinstance(lang_code, str):
+            supported_languages[lang_code] = {'alias': sp_option_value}
+        elif isinstance(lang_code, list):
+            for lc in lang_code:
+                supported_languages[lc] = {'alias': sp_option_value}
+        else:
+            print('Unknown language option in Startpage: {} ({})'.format(sp_option_value, sp_option_text))
+
+    return supported_languages