Extract the first 3 chars during 3pid obfuscation, not just the 3rd c…

…har (matrix-org#317) This is a duplicate of matrix-org#316 for mainline which fixed the same bug on `dinsic`. The bug originally stemmed from matrix-org#311.
ShadowJonathan · Oct 14, 2020 · 0f826b6 · 0f826b6
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diff --git a/changelog.d/317.bugfix b/changelog.d/317.bugfix
@@ -0,0 +1 @@
+Fix a regression in v2.2.0 where the wrong characters would be obfuscated in a 3pid invite.
diff --git a/sydent/http/servlets/store_invite_servlet.py b/sydent/http/servlets/store_invite_servlet.py
@@ -169,7 +169,7 @@ def _redact(self, s, characters_to_reveal):
         # If the string is shorter than the defined threshold, redact based on length
         if len(s) <= characters_to_reveal:
             if len(s) > 5:
-                return s[3] + u"..."
+                return s[:3] + u"..."
             if len(s) > 1:
                 return s[0] + u"..."
             return u"..."