Add roles from presenters adapter to be used with event session

Author: datakurre

backend/src/collective/techevent/behaviors/configure.zcml

@@ -26,4 +26,16 @@
       provides=".session.IEventSession"
       />
 
+  <plone:behavior
+      name="collective.techevent.presenter_roles"
+      title="Tech Event: Apply presenter roles"
+      description=""
+      provides=".presenter.IPresenterLocalRoles"
+      />
+
+  <adapter
+      factory=".presenter.PresenterRoleProvider"
+      name="collective.techevent.presenter_roles"
+      />
+
 </configure>

backend/src/collective/techevent/behaviors/presenter.py

@@ -0,0 +1,57 @@
+from borg.localrole.interfaces import ILocalRoleProvider
+from plone import api
+from z3c.relationfield import RelationValue
+from zope.component import adapter
+from zope.interface import implementer
+from zope.interface import Interface
+
+
+class IPresenterLocalRoles(Interface):
+    """Marker interface for the local roles of a presenter."""
+
+
+@implementer(ILocalRoleProvider)
+@adapter(IPresenterLocalRoles)
+class PresenterRoleProvider:
+    def __init__(self, context):
+        self.context = context
+
+    def getRoles(self, user_id):
+        """
+        Return the roles assigned to the given user ID in the context of presenters for the current event session.
+        """
+        mtool = api.portal.get_tool("portal_membership")
+        user = mtool.getMemberById(user_id)
+        if not user:
+            return []
+        roles = set()
+        presenters = getattr(self.context, "presenters", [])
+        for presenter_relation in presenters:
+            if (
+                isinstance(presenter_relation, RelationValue)
+                and presenter_relation.to_object
+            ):
+                presenter = presenter_relation.to_object
+                roles.update(user.getRolesInContext(presenter))
+        return list(roles)
+
+    def getAllRoles(self):
+        """
+        Retrieve all roles assigned to users in the context of presenters for the current event session.
+
+        This method merges roles from all presenters for each user. It does not consider additional role adapters.
+        """
+        roles = {}
+        presenters = getattr(self.context, "presenters", [])
+        for presenter_relation in presenters:
+            if (
+                isinstance(presenter_relation, RelationValue)
+                and presenter_relation.to_object
+            ):
+                presenter = presenter_relation.to_object
+                local_roles = presenter.get_local_roles()
+                for user_id, user_roles in local_roles:
+                    if user_id not in roles:
+                        roles[user_id] = set()
+                    roles[user_id].update(user_roles)
+        return [(user_id, tuple(user_roles)) for user_id, user_roles in roles.items()]