From 15a853bd8a8f40521fd7fedf821c7c7b98037d45 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?P=C4=93teris=20Caune?= <cuu508@gmail.com>
Date: Tue, 19 Feb 2019 11:11:29 +0200
Subject: [PATCH] Escape asterisks in Slack messages. Fixes #223

---
 CHANGELOG.md                              | 1 +
 hc/front/templatetags/hc_extras.py        | 7 +++++++
 templates/integrations/slack_message.json | 2 +-
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/CHANGELOG.md b/CHANGELOG.md
index c04c83fb..34af2094 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -8,6 +8,7 @@ All notable changes to this project will be documented in this file.
 
 ### Bug Fixes
 - Fix refreshing of the checks page filtered by tags (#221)
+- Escape asterisks in Slack messages (#223)
 
 
 ## 1.5.0 - 2019-02-04
diff --git a/hc/front/templatetags/hc_extras.py b/hc/front/templatetags/hc_extras.py
index d8306f84..c25182f5 100644
--- a/hc/front/templatetags/hc_extras.py
+++ b/hc/front/templatetags/hc_extras.py
@@ -114,3 +114,10 @@ def break_underscore(s):
         s = s.replace("_", "_\u200b")
 
     return s
+
+
+@register.filter
+def fix_asterisks(s):
+    """ Prepend asterisks with "Combining Grapheme Joiner" characters. """
+
+    return s.replace("*", "\u034f*")
diff --git a/templates/integrations/slack_message.json b/templates/integrations/slack_message.json
index 8983ec18..40338b3a 100644
--- a/templates/integrations/slack_message.json
+++ b/templates/integrations/slack_message.json
@@ -25,7 +25,7 @@
                 },
             {% elif check.kind == "cron" %}
                 {"title": "Schedule",
-                 "value": "{{ check.schedule|escapejs }}",
+                 "value": "{{ check.schedule|fix_asterisks|escapejs }}",
                  "short": true
                 },
             {% endif %}