backoffice: compute data_source URL if it's a template (#13902)

tests/test_admin_pages.py

@@ -4994,6 +4994,13 @@ def test_data_sources_view(pub):
     assert 'Preview' in resp.text
     assert 'foo' in resp.text
 
+    # variadic url
+    data_source.data_source = {'type': 'json', 'value': '{{ site_url }}/foo/bar'}
+    data_source.store()
+    with HttpRequestsMocking() as http_requests:
+        resp = app.get('/backoffice/settings/data-sources/%s/' % data_source.id)
+    assert '<a href="http://example.net/foo/bar"' in resp.text
+
     data_source.data_source = {'type': 'formula', 'value': '[str(x) for x in range(100)]'}
     data_source.store()
     resp = app.get('/backoffice/settings/data-sources/%s/' % data_source.id)

wcs/data_sources.py

@@ -424,6 +424,13 @@ class NamedDataSource(XmlStorableObject):
     def humanized_cache_duration(self):
         return seconds2humanduration(int(self.cache_duration))
 
+    def get_variadic_url(self):
+        url = self.data_source.get('value').strip()
+        if url and Template.is_template_string(url):
+            vars = get_publisher().substitutions.get_context_variables(mode='lazy')
+            url = get_variadic_url(url, vars)
+        return url
+
     def is_used_in_formdef(self, formdef):
         from .fields import WidgetField
         for field in formdef.fields or []:

wcs/templates/wcs/backoffice/data-sources.html

@@ -18,7 +18,7 @@
 <ul>
   <li>{% trans "Type of source:" %} {{ datasource.type_label }}</li>
   {% if datasource.data_source.type == 'json' or datasource.data_source.type == 'jsonp' %}
-  <li>{% trans "URL:" %} <a href="{{ datasource.data_source.value }}">{{ datasource.data_source.value }}</a></li>
+  <li>{% trans "URL:" %} <a href="{{ datasource.get_variadic_url }}">{{ datasource.data_source.value }}</a></li>
   {% elif datasource.data_source.type == 'formula' %}
   <li>{% trans "Python Expression:" %} {{ datasource.data_source.value }}</li>
   {% endif %}