Pillar extensions can now register global Jinja2 context processors.

pillar/__init__.py

@@ -304,6 +304,14 @@ class PillarServer(Eve):
 
         pillar.web.jinja.setup_jinja_env(self.jinja_env)
 
+        # Register context processors from extensions
+        for ext in self.pillar_extensions.values():
+            if not ext.has_context_processor:
+                continue
+
+            self.log.debug('Registering context processor for %s', ext.name)
+            self.context_processor(ext.context_processor)
+
     def _config_static_dirs(self):
         # Setup static folder for the instanced app
         self.static_folder = os.path.join(self.app_root, 'static')

pillar/extension.py

@@ -26,6 +26,9 @@ class PillarExtension(object, metaclass=abc.ABCMeta):
     # Set to True when your extension implements the project_settings() method.
     has_project_settings = False
 
+    # Set to True when your extension implements the context_processor() method.
+    has_context_processor = False
+
     # List of Celery task modules introduced by this extension.
     celery_task_modules: typing.List[str] = []
 
@@ -121,3 +124,11 @@ class PillarExtension(object, metaclass=abc.ABCMeta):
         :param template_args: additional template arguments.
         :returns: a Flask HTTP response
         """
+
+    def context_processor(self) -> dict:
+        """Returns a dictionary that gets injected into the Flask Jinja2 namespace.
+
+        Set has_context_processor  to True when your extension implements this method.
+        """
+
+        return {}