Deprecate LogoutButton

components/dash-core-components/tests/integration/location/test_location_logout.py

@@ -1,10 +1,12 @@
 from dash.exceptions import PreventUpdate
 from dash import Dash, Input, Output, dcc, html
 import flask
+import pytest
 import time
 
 
-def test_llgo001_location_logout(dash_dcc):
+@pytest.mark.parametrize("add_initial_logout_button", [False, True])
+def test_llgo001_location_logout(dash_dcc, add_initial_logout_button):
     app = Dash(__name__)
 
     @app.server.route("/_logout", methods=["POST"])
@@ -13,9 +15,14 @@ def on_logout():
         rep.set_cookie("logout-cookie", "", 0)
         return rep
 
-    app.layout = html.Div(
-        [html.H2("Logout test"), dcc.Location(id="location"), html.Div(id="content")]
-    )
+    layout_children = [
+        html.H2("Logout test"),
+        dcc.Location(id="location"),
+        html.Div(id="content"),
+    ]
+    if add_initial_logout_button:
+        layout_children.append(dcc.LogoutButton())
+    app.layout = html.Div(layout_children)
 
     @app.callback(Output("content", "children"), [Input("location", "pathname")])
     def on_location(location_path):
@@ -33,15 +40,19 @@ def _insert_cookie(rep):
 
             return dcc.LogoutButton(id="logout-btn", logout_url="/_logout")
 
-    dash_dcc.start_server(app)
-    time.sleep(1)
-    dash_dcc.percy_snapshot("Core Logout button")
+    with pytest.warns(
+        DeprecationWarning,
+        match="The Logout Button is no longer used with Dash Enterprise and can be replaced with a html.Button or html.A.",
+    ):
+        dash_dcc.start_server(app)
+        time.sleep(1)
+        dash_dcc.percy_snapshot("Core Logout button")
 
-    assert dash_dcc.driver.get_cookie("logout-cookie")["value"] == "logged-in"
+        assert dash_dcc.driver.get_cookie("logout-cookie")["value"] == "logged-in"
 
-    dash_dcc.wait_for_element("#logout-btn").click()
-    dash_dcc.wait_for_text_to_equal("#content", "Logged out")
+        dash_dcc.wait_for_element("#logout-btn").click()
+        dash_dcc.wait_for_text_to_equal("#content", "Logged out")
 
-    assert not dash_dcc.driver.get_cookie("logout-cookie")
+        assert not dash_dcc.driver.get_cookie("logout-cookie")
 
-    assert dash_dcc.get_logs() == []
+        assert dash_dcc.get_logs() == []

dash/_validate.py

@@ -1,6 +1,8 @@
 import sys
+from collections import defaultdict
 from collections.abc import MutableSequence
 import re
+import warnings
 from textwrap import dedent
 from keyword import iskeyword
 import flask
@@ -422,6 +424,21 @@ def validate_layout(layout, layout_value):
     component_ids = set()
 
     def _validate(value):
+        def _validate_type(comp):
+            deprecated_components = defaultdict(lambda: defaultdict(dict))
+            deprecated_components["dash_core_components"][
+                "LogoutButton"
+            ] = """
+                The Logout Button is no longer used with Dash Enterprise and can be replaced with a html.Button or html.A.
+                eg: html.A(href=os.getenv('DASH_LOGOUT_URL'))
+            """
+
+            _type = getattr(comp, "_type", "")
+            _ns = getattr(comp, "_namespace", "")
+            deprecation_message = deprecated_components[_ns][_type]
+            if deprecation_message:
+                warnings.warn(dedent(deprecation_message), DeprecationWarning)
+
         def _validate_id(comp):
             component_id = stringify_id(getattr(comp, "id", None))
             if component_id and component_id in component_ids:
@@ -432,9 +449,11 @@ def _validate_id(comp):
                 )
             component_ids.add(component_id)
 
+        _validate_type(value)
         _validate_id(value)
 
         for component in value._traverse():  # pylint: disable=protected-access
+            _validate_type(component)
             _validate_id(component)
 
     if isinstance(layout_value, (list, tuple)):