[enh] plugin preferences - server-side ++ oscar theme

searx/templates/oscar/preferences.html

-{% from 'oscar/macros.html' import preferences_item_header, preferences_item_header_rtl, preferences_item_footer, preferences_item_footer_rtl %}
+{% from 'oscar/macros.html' import preferences_item_header, preferences_item_header_rtl, preferences_item_footer, preferences_item_footer_rtl, checkbox_toggle %}
 {% extends "oscar/base.html" %}
 {% block title %}{{ _('preferences') }} - {% endblock %}
 {% block site_alert_warning_nojs %}
     <ul class="nav nav-tabs nav-justified hide_if_nojs" role="tablist" style="margin-bottom:20px;">
       <li class="active"><a href="#tab_general" role="tab" data-toggle="tab">{{ _('General') }}</a></li>
       <li><a href="#tab_engine" role="tab" data-toggle="tab">{{ _('Engines') }}</a></li>
+      <li><a href="#tab_plugins" role="tab" data-toggle="tab">{{ _('Plugins') }}</a></li>
     </ul>
 
     <!-- Tab panes -->
                                 <div class="col-xs-6 col-sm-4 col-md-4">{{ search_engine.name }} ({{ shortcuts[search_engine.name] }})</div>
                                 {% endif %}
                                 <div class="col-xs-6 col-sm-4 col-md-4">
-                                    <div class="checkbox">
-                                    <input class="hidden" type="checkbox" id="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}" name="engine_{{ search_engine.name }}__{{ categ }}"{% if (search_engine.name, categ) in blocked_engines %} checked="checked"{% endif %} />
-                                    <label class="btn btn-success label_hide_if_checked" for="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}">{{ _('Block') }}</label>
-                                    <label class="btn btn-danger label_hide_if_not_checked" for="engine_{{ categ|replace(' ', '_') }}_{{ search_engine.name|replace(' ', '_') }}">{{ _('Allow') }}</label>
-                                    </div>
+                                    {{ checkbox_toggle('engine_' + search_engine.name|replace(' ', '_') + '__' + categ|replace(' ', '_'), (search_engine.name, categ) in blocked_engines) }}
                                 </div>
                                 {% if rtl %}
                                 <div class="col-xs-6 col-sm-4 col-md-4">{{ search_engine.name }} ({{ shortcuts[search_engine.name] }})&lrm;</div>
                 {% endfor %}
             </div>
         </div>
+        <div class="tab-pane active_if_nojs" id="tab_plugins">
+            <noscript>
+                <h3>{{ _('Plugins') }}</h3>
+            </noscript>
+            <fieldset>
+            <div class="container-fluid">
+                {% for plugin in plugins %}
+                <div class="panel panel-default">
+                    <div class="panel-heading">
+                        <h3 class="panel-title">{{ plugin.name }}</h3>
+                    </div>
+                    <div class="panel-body">
+                        <div class="col-xs-6 col-sm-4 col-md-6">{{ plugin.description }}</div>
+                        <div class="col-xs-6 col-sm-4 col-md-6">
+                            {{ checkbox_toggle('plugin_' + plugin.id, plugin.id not in allowed_plugins) }}
+                        </div>
+                    </div>
+                </div>
+                {% endfor %}
+            </div>
+            </fieldset>
+        </div>
     </div>
     <p class="text-muted" style="margin:20px 0;">{{ _('These settings are stored in your cookies, this allows us not to store this data about you.') }}
     <br />

searx/webapp.py

     allowed_plugins = request.cookies.get('allowed_plugins', '').split(',')
     disabled_plugins = request.cookies.get('disabled_plugins', '').split(',')
     for plugin in plugins:
-        if ((plugin.default_on and plugin.name not in disabled_plugins)
-                or plugin.name in allowed_plugins):
+        if ((plugin.default_on and plugin.id not in disabled_plugins)
+                or plugin.id in allowed_plugins):
             request.user_plugins.append(plugin)
 
 
         blocked_engines = get_blocked_engines(engines, request.cookies)
     else:  # on save
         selected_categories = []
+        post_disabled_plugins = []
         locale = None
         autocomplete = ''
         method = 'POST'
                 safesearch = pd
             elif pd_name.startswith('engine_'):
                 if pd_name.find('__') > -1:
-                    engine_name, category = pd_name.replace('engine_', '', 1).split('__', 1)
+                    # TODO fix underscore vs space
+                    engine_name, category = [x.replace('_', ' ') for x in
+                                             pd_name.replace('engine_', '', 1).split('__', 1)]
                     if engine_name in engines and category in engines[engine_name].categories:
                         blocked_engines.append((engine_name, category))
             elif pd_name == 'theme':
                 theme = pd if pd in themes else default_theme
+            elif pd_name.startswith('plugin_'):
+                plugin_id = pd_name.replace('plugin_', '', 1)
+                if not any(plugin.id == plugin_id for plugin in plugins):
+                    continue
+                post_disabled_plugins.append(plugin_id)
             else:
                 resp.set_cookie(pd_name, pd, max_age=cookie_max_age)
 
+        disabled_plugins = []
+        allowed_plugins = []
+        for plugin in plugins:
+            if plugin.default_on:
+                if plugin.id in post_disabled_plugins:
+                    disabled_plugins.append(plugin.id)
+            elif plugin.id not in post_disabled_plugins:
+                allowed_plugins.append(plugin.id)
+
+        resp.set_cookie('disabled_plugins', ','.join(disabled_plugins), max_age=cookie_max_age)
+
+        resp.set_cookie('allowed_plugins', ','.join(allowed_plugins), max_age=cookie_max_age)
+
         resp.set_cookie(
             'blocked_engines', ','.join('__'.join(e) for e in blocked_engines),
             max_age=cookie_max_age
                   autocomplete_backends=autocomplete_backends,
                   shortcuts={y: x for x, y in engine_shortcuts.items()},
                   themes=themes,
+                  plugins=plugins,
+                  allowed_plugins=[plugin.id for plugin in request.user_plugins],
                   theme=get_current_theme_name())