Escape asterisks in Slack messages. Fixes #223

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

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*")

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 %}