From e7ded8b1e750d92d7325362efa6d91495228d64e Mon Sep 17 00:00:00 2001
From: Alejandro Rojas <alrolorojas@github.com>
Date: Wed, 26 Jun 2019 15:53:55 +0200
Subject: [PATCH] [AIRFLOW-5387] Handle showPaused URL param properly

---
 airflow/www/utils.py    | 17 +++++++++++++++--
 tests/www/test_utils.py | 42 +++++++++++++++++++++++++++++++++--------
 2 files changed, 49 insertions(+), 10 deletions(-)

diff --git a/airflow/www/utils.py b/airflow/www/utils.py
index 4902a3c1daca9..1422ac2f0187b 100644
--- a/airflow/www/utils.py
+++ b/airflow/www/utils.py
@@ -65,13 +65,26 @@ def should_hide_value_for_key(key_name):
 
 
 def get_params(**kwargs):
+    hide_paused_dags_by_default = conf.getboolean('webserver',
+                                                  'hide_paused_dags_by_default')
     if 'showPaused' in kwargs:
-        v = kwargs['showPaused']
-        if v or v is None:
+        show_paused_dags_url_param = kwargs['showPaused']
+        if _should_remove_show_paused_from_url_params(
+            show_paused_dags_url_param,
+            hide_paused_dags_by_default
+        ):
             kwargs.pop('showPaused')
     return urlencode({d: v if v is not None else '' for d, v in kwargs.items()})
 
 
+def _should_remove_show_paused_from_url_params(show_paused_dags_url_param,
+                                               hide_paused_dags_by_default):
+    return any([
+        show_paused_dags_url_param != hide_paused_dags_by_default,
+        show_paused_dags_url_param is None
+    ])
+
+
 def generate_pages(current_page, num_of_pages,
                    search=None, showPaused=None, window=7):
     """
diff --git a/tests/www/test_utils.py b/tests/www/test_utils.py
index 002d19eda03b6..a5e519b8ec775 100644
--- a/tests/www/test_utils.py
+++ b/tests/www/test_utils.py
@@ -23,8 +23,10 @@
 from urllib.parse import parse_qs
 
 from bs4 import BeautifulSoup
+from parameterized import parameterized
 
 from airflow.www import utils
+from tests.test_utils.config import conf_vars
 
 
 class TestUtils(unittest.TestCase):
@@ -103,14 +105,38 @@ def test_params_search(self):
         self.assertEqual('search=bash_',
                          utils.get_params(search='bash_'))
 
-    def test_params_showPaused_true(self):
-        """Should detect True as default for showPaused"""
-        self.assertEqual('',
-                         utils.get_params(showPaused=True))
-
-    def test_params_showPaused_false(self):
-        self.assertEqual('showPaused=False',
-                         utils.get_params(showPaused=False))
+    @parameterized.expand([
+        (True, False, ''),
+        (False, True, ''),
+        (True, True, 'showPaused=True'),
+        (False, False, 'showPaused=False'),
+        (None, True, ''),
+        (None, False, ''),
+    ])
+    def test_params_showPaused(self, show_paused, hide_by_default, expected_result):
+        with conf_vars({('webserver', 'hide_paused_dags_by_default'): str(hide_by_default)}):
+            self.assertEqual(expected_result,
+                             utils.get_params(showPaused=show_paused))
+
+    @parameterized.expand([
+        (True, False, True),
+        (False, True, True),
+        (True, True, False),
+        (False, False, False),
+        (None, True, True),
+        (None, False, True),
+    ])
+    def test_should_remove_show_paused_from_url_params(self, show_paused,
+                                                       hide_by_default, expected_result):
+        with conf_vars({('webserver', 'hide_paused_dags_by_default'): str(hide_by_default)}):
+
+            self.assertEqual(
+                expected_result,
+                utils._should_remove_show_paused_from_url_params(
+                    show_paused,
+                    hide_by_default
+                )
+            )
 
     def test_params_none_and_zero(self):
         qs = utils.get_params(a=0, b=None)