[enh] generate search url of saved preferences

searx/preferences.py

 from searx import settings, autocomplete
 from searx.languages import language_codes as languages
+from searx.url_utils import urlencode
 
 
 COOKIE_MAX_AGE = 60 * 60 * 24 * 365 * 5  # 5 years
 
 
 class Preferences(object):
-    """Stores, validates and saves preferences to cookies"""
+    """Validates and saves preferences to cookies"""
 
     def __init__(self, themes, categories, engines, plugins):
         super(Preferences, self).__init__()
                                    'image_proxy': MapSetting(settings['server']['image_proxy'],
                                                              map={'': settings['server']['image_proxy'],
                                                                   '0': False,
-                                                                  '1': True}),
+                                                                  '1': True,
+                                                                  'True': True,
+                                                                  'False': False}),
                                    'method': EnumStringSetting('POST', choices=('GET', 'POST')),
                                    'safesearch': MapSetting(settings['search']['safe_search'], map={'0': 0,
                                                                                                     '1': 1,
                                                                                                     '2': 2}),
                                    'theme': EnumStringSetting(settings['ui']['default_theme'], choices=themes),
-                                   'results_on_new_tab': MapSetting(False, map={'0': False, '1': True})}
+                                   'results_on_new_tab': MapSetting(False, map={'0': False,
+                                                                                '1': True,
+                                                                                'False': False,
+                                                                                'True': True})}
 
         self.engines = EnginesSetting('engines', choices=engines)
         self.plugins = PluginsSetting('plugins', choices=plugins)
         self.unknown_params = {}
 
-    def parse_cookies(self, input_data):
+    def get_as_url_params(self):
+        settings_kv = {}
+        for k, v in self.key_value_settings.items():
+            if isinstance(v, MultipleChoiceSetting):
+                settings_kv[k] = ','.join(v.get_value())
+            else:
+                settings_kv[k] = v.get_value()
+
+        settings_kv['disabled_engines'] = ','.join(self.engines.disabled)
+        settings_kv['enabled_engines'] = ','.join(self.engines.enabled)
+
+        settings_kv['disabled_plugins'] = ','.join(self.plugins.disabled)
+        settings_kv['enabled_plugins'] = ','.join(self.plugins.enabled)
+
+        return urlencode(settings_kv)
+
+    def parse_dict(self, input_data):
         for user_setting_name, user_setting in input_data.items():
             if user_setting_name in self.key_value_settings:
                 self.key_value_settings[user_setting_name].parse(user_setting)

searx/templates/oscar/preferences.html

         <br />
         {{ _("These cookies serve your sole convenience, we don't use these cookies to track you.") }}
         </p>
+        <p style="margin:20px 0;">{{ _('Search URL of the currently saved preferences') }} <small class="text-muted">({{ _('Note: specifying custom settings in the search URL can reduce privacy by leaking data to the clicked result sites.') }})</small>:<br/>
+          <input readonly="" class="form-control select-all-on-click cursor-text" type="url" value="{{ url_for('index', _external=True) }}?{{ preferences_url_params|e }}{% raw %}&amp;q=%s{% endraw %}">
+        </p>
 
         <input type="submit" class="btn btn-primary" value="{{ _('save') }}" />
         <a href="{{ url_for('index') }}"><div class="btn btn-default">{{ _('back') }}</div></a>

searx/webapp.py

     preferences = Preferences(themes, list(categories.keys()), engines, plugins)
     request.preferences = preferences
     try:
-        preferences.parse_cookies(request.cookies)
+        preferences.parse_dict(request.cookies)
     except:
         request.errors.append(gettext('Invalid settings, please edit your preferences'))
 
     for k, v in request.args.items():
         if k not in request.form:
             request.form[k] = v
+    try:
+        preferences.parse_dict(request.form)
+    except Exception as e:
+        logger.exception('invalid settings')
+        request.errors.append(gettext('Invalid settings'))
 
     # request.user_plugins
     request.user_plugins = []
                   plugins=plugins,
                   allowed_plugins=allowed_plugins,
                   theme=get_current_theme_name(),
+                  preferences_url_params=request.preferences.get_as_url_params(),
+                  base_url=get_base_url(),
                   preferences=True)