[fix] make /stats more CSP compliant - simple theme

Replace simple theme's *styles* (see below) by CSP compliant implementation in
``searx/static/themes/simple/less/stats.less`` ::

    ./simple/stats.html:26:  <table style="max-width: 1280px; margin: 0 auto 0 0;">
    ./simple/stats.html:28:  <th scope="col" style="width:20rem;">{{ th_sort('name', _("Engine name")) }}</th>
    ./simple/stats.html:29:  <th scope="col" style="width:7rem; text-align: right;">{{ th_sort('score', _('Scores')) }}</th>
    ./simple/stats.html:32:  <th scope="col" style="text-align: right;">{{ th_sort('reliability', _('Reliability')) }}</th>
    ./simple/stats.html:37:  <td style="text-align: right;">
    ./simple/stats.html:90:  <td style="text-align: right;"> {{ engine_reliabilities.get(engine_stat.name, {}).get('reliablity') }}</td>
    ./simple/stats.html:106: <table style="max-width: 1280px; margin: 1rem; border: 1px solid gray;">
    ./simple/stats.html:107: <tbody style="padding-top: 1rem;">
    ./simple/stats.html:110: <th scope="row" style="width: 10rem">{{ _('Exception') }}</th><td>{{ error.exception_classname }}</td>
    ./simple/stats.html:112: <th scope="row" style="width: 10rem">{{ _('Message') }}</th><td>{{ error.log_message }}</td>
    ./simple/stats.html:114: <th scope="row" style="width: 10rem">{{ _('Percentage') }}</th><td style="width: 10rem">{{ error.percentage }}</td>
    ./simple/stats.html:119: <span style="border-right: 1px solid gray; padding: 0 1rem 0 0; margin: 0 0 0 0.5rem;">{{ param }}</span>
    ./simple/stats.html:136: <th scope="col" style="width: 10rem">{{ _('Failed test') }}</th>

Reported-by: https://github.com/searxng/searxng/issues/57
Signed-off-by: Markus Heiser <markus.heiser@darmarit.de>

2 files changed, 65 insertions, 18 deletions

diff --git a/searx/static/themes/__common__/less/stats.less b/searx/static/themes/__common__/less/stats.less
index 6c2117b39..2204fb02b 100644
--- a/searx/static/themes/__common__/less/stats.less
+++ b/searx/static/themes/__common__/less/stats.less
@@ -1,3 +1,50 @@
+#main_stats {
+
+    table {
+	margin: 0 auto 0 0;
+    }
+
+    table .engine-name {
+	width: 20rem;
+    }
+
+    table .engine-scores {
+	width: 7rem;
+    }
+
+    table .result-count {
+    }
+
+    table .response-time {
+    }
+
+    table .engine-reliability {
+	text-align: right;
+    }
+
+    table.engine-error {
+	max-width: 1280px;
+	margin: 1rem;
+	border: 1px solid gray;
+    }
+
+    table.engine-error th.engine-error-type,
+    table.engine-error td.engine-error-type,
+    failed-test {
+	width: 10rem;
+    }
+
+    table.engine-error span.log_parameters
+    {
+	border-right: 1px solid gray;
+	padding: 0 1rem 0 0;
+	margin: 0 0 0 0.5rem;
+    }
+}
+
+@media screen and (max-width: 75em) {
+}
+
 .bar-chart-value {
     width: 3em;
 }
diff --git a/searx/templates/simple/stats.html b/searx/templates/simple/stats.html
index c2396f0e5..968208381 100644
--- a/searx/templates/simple/stats.html
+++ b/searx/templates/simple/stats.html
@@ -23,18 +23,18 @@
 {% if not engine_stats.get('time') %}
 {{ _('There is currently no data available. ') }}
 {% else %}
-<table style="max-width: 1280px; margin: 0 auto 0 0;">
+<table class="engine-stats">
     <tr>
-        <th scope="col" style="width:20rem;">{{ th_sort('name', _("Engine name")) }}</th>
-        <th scope="col" style="width:7rem; text-align: right;">{{ th_sort('score', _('Scores')) }}</th>
-        <th scope="col">{{ th_sort('result_count', _('Result count')) }}</th>
-        <th scope="col">{{ th_sort('time', _('Response time')) }}</th>
-        <th scope="col" style="text-align: right;">{{ th_sort('reliability', _('Reliability')) }}</th>
+        <th scope="col" class="engine-name">{{ th_sort('name', _("Engine name")) }}</th>
+        <th scope="col" class="engine-scores">{{ th_sort('score', _('Scores')) }}</th>
+        <th scope="col" class="result-count">{{ th_sort('result_count', _('Result count')) }}</th>
+        <th scope="col" class="response-time">{{ th_sort('time', _('Response time')) }}</th>
+        <th scope="col" class="engine-reliability">{{ th_sort('reliability', _('Reliability')) }}</th>
     </tr>
     {% for engine_stat in engine_stats.get('time', []) %}
     <tr>
-        <td><a href="{{ url_for('stats', engine=engine_stat.name|e) }}">{{ engine_stat.name }}</a></td>
-        <td style="text-align: right;">
+        <td class="engine-name"><a href="{{ url_for('stats', engine=engine_stat.name|e) }}">{{ engine_stat.name }}</a></td>
+        <td class="engine-scores">
             {% if engine_stat.score %}
             <span aria-labelledby="{{engine_stat.name}}_score" >{{ engine_stat.score|round(1) }}</span>
             <div class="engine-tooltip" role="tooltip" id="{{engine_stat.name}}_score">{{- "" -}}
@@ -42,7 +42,7 @@
             </div>
             {% endif %}
         </td>
-        <td>
+        <td class="engine-result-count">
             {%- if engine_stat.result_count -%}
 
             <div class="bar-chart-value">{{- engine_stat.result_count | int -}}</div>{{- "" -}}
@@ -51,7 +51,7 @@
 	    </div>
             {%- endif -%}
         </td>
-        <td>
+        <td class="response-time">
             {%- if engine_stat.total -%}
 
             <div class="bar-chart-value">{{- engine_stat.total | round(1) -}}</div>{{- "" -}}
@@ -89,7 +89,7 @@
             </div>
             {%- endif -%}
         </td>
-        <td style="text-align: right;"> {{ engine_reliabilities.get(engine_stat.name, {}).get('reliablity') }}</td>
+        <td class="engine-reliability"> {{ engine_reliabilities.get(engine_stat.name, {}).get('reliablity') }}</td>
     </tr>
     {% endfor %}
 </table>
@@ -105,20 +105,20 @@
                         {% set ns.first = false %}
                         <h3>{% if secondary %}{{ _('Warnings') }}{% else %}{{ _('Errors and exceptions') }}{% endif %}</h3>
                     {% endif %}
-                    <table style="max-width: 1280px; margin: 1rem; border: 1px solid gray;">
-                        <tbody style="padding-top: 1rem;">
+                    <table class="engine-error">
+                        <tbody>
                             <tr>
                                 {%- if error.exception_classname -%}
-                                    <th scope="row" style="width: 10rem">{{ _('Exception') }}</th><td>{{ error.exception_classname }}</td>
+                                    <th scope="row" class="engine-error-type">{{ _('Exception') }}</th><td>{{ error.exception_classname }}</td>
                                 {%- elif error.log_message -%}
-                                    <th scope="row" style="width: 10rem">{{ _('Message') }}</th><td>{{ error.log_message }}</td>
+                                    <th scope="row" class="engine-error-type">{{ _('Message') }}</th><td>{{ error.log_message }}</td>
                                 {%- endif -%}
-                                <th scope="row" style="width: 10rem">{{ _('Percentage') }}</th><td style="width: 10rem">{{ error.percentage }}</td>
+                                <th scope="row" class="engine-error-type">{{ _('Percentage') }}</th><td class="engine-error-type">{{ error.percentage }}</td>
                             </tr>
                             {% if error.log_parameters and error.log_parameters != (None, None, None) %}<tr><th scope="row">{{ _('Parameter') }}</th>{{- '' -}}
                                 <td colspan="3">
                                     {%- for param in error.log_parameters -%}
-                                        <span style="border-right: 1px solid gray; padding: 0 1rem 0 0; margin: 0 0 0 0.5rem;">{{ param }}</span>
+                                        <span class="log_parameters">{{ param }}</span>
                                     {%- endfor -%}
                                 </td>
                             </tr>
@@ -135,7 +135,7 @@
             <h3>{{ _('Checker') }}</h3>
             <table>
                 <tr>
-                    <th scope="col" style="width: 10rem">{{ _('Failed test') }}</th>
+                    <th scope="col" class="failed-test">{{ _('Failed test') }}</th>
                     <th scope="col">{{ _('Comment(s)') }}</th>
                 </tr>
                 {% for test_name, results in engine_reliabilities[selected_engine_name].checker.items() %}