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https://issues.apache.org/jira/browse/COUCHDB-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13499581#comment-13499581
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Dale Harvey commented on COUCHDB-1607:
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Good debugging, you can use re:split("a:b:c", ":", [{return, list}]). although
I would be worried about 1. why its using lists at all, 2. why is it generating
an empty value in the first place?
> cookie_authentication_handler does not properly handle AuthSession signatures
> starting with ":" character(s)
> ------------------------------------------------------------------------------------------------------------
>
> Key: COUCHDB-1607
> URL: https://issues.apache.org/jira/browse/COUCHDB-1607
> Project: CouchDB
> Issue Type: Bug
> Affects Versions: 1.2
> Reporter: Nathan Vander Wilt
> Priority: Critical
>
> AuthSession cookies will intermittently "break" — a user will have a
> perfectly valid session, but suddenly after their cookie gets refreshed they
> can randomly get "logged out" for practical purposes.
> The cause is that Erlang's `string:tokens` behaviour does act as this code
> expects:
> https://github.com/apache/couchdb/blob/7d4181346626c0cdb50b44f7e5e33435a8ccae0f/src/couchdb/couch_httpd_auth.erl#L163
> https://github.com/apache/couchdb/blob/7d4181346626c0cdb50b44f7e5e33435a8ccae0f/src/couchdb/couch_httpd_auth.erl#L183
> After evaluating `[A,B | C] = string:tokens("a:b::c:d").` the value of C is
> not `["","c","d"]` but rather `["c","d"]`. So when rejoined, the signature
> becomes "c:d" instead of the original ":c:d"!
> It appears that using re.split/2 would avoid this problem, but yields a
> list/array result containing <<"">> instead of "" types, which string:join
> does not like. Should be pretty quick fix though for someone who knows just a
> bit more of the Erlang way.
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