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From "Curt Arnold (JIRA)" <>
Subject [jira] Commented: (COUCHDB-345) "High ASCII" can be inserted into db but not retrieved
Date Sat, 29 Aug 2009 16:29:32 GMT


Curt Arnold commented on COUCHDB-345:

I looked at the Erlang test suite and didn't see anything that looked similar to what I wanted
to test.  When I did "make check", I got a lot of lines like:

    Test returned status 127 (wstat 32512, 0x7f00)

Looks like it is beyond my skills at the moment to write an Erlang test that would effectively
test the changes.

If you wanted to accept interpret badly encoded UTF-8 as ISO-8859-1, I'd suggest logging it,
but in the catch, you could do something like:


Sniffing the multi-byte encodings could also be done in couch_db:json_decode as an enhancement.
 You don't have the Content-Encoding header available, so you could not support users who
explicitly try to send JSON in arbitrary encodings.  However, since JSON is supposed to be
encoded in Unicode and you can unambiguously determine the encoding from the content.  I think
it is best to ignore the Content-Encoding even if it was available.

I do not know the performance implications of the patch.  It would likely be cheaper if the
binary could be scanned only and not extracted to a list, but I think that has to be relatively
minor compared to the JSON parsing.

> "High ASCII" can be inserted into db but not retrieved
> ------------------------------------------------------
>                 Key: COUCHDB-345
>                 URL:
>             Project: CouchDB
>          Issue Type: Bug
>    Affects Versions: 0.9
>         Environment: OSX 10.5.6
>            Reporter: Joan Touzet
>         Attachments: badenc1.patch, badtext.tar.gz,, reject_invalid_utf8.patch
> It is possible to PUT/POST a document into CouchDB with a "high ASCII" value that cannot
be retrieved. This results from not escaping a non-ASCII value into \u#### when PUT/POSTing
the document.
> The attached sample code will recreate the problem using the hex value D8 (Ø) in a possibly
unsavoury test string.
> Sample output against 0.9.0 is as follows:
> ================================================
> {
>     "ok": true
> }
> {
>     "id": "fail", 
>     "ok": true, 
>     "rev": "1-76726372"
> }
> {
>     "error": "ucs", 
>     "reason": "{bad_utf8_character_code}"
> }
> ================================================
> Please note this defect turned up another problem, namely that the bad_utf8_character_code
exception thrown by a design document attempting to map() the bad document caused Futon to
fail silently in building the view, with no indication (except via debug log) that there was
a failure. The log indicated two attempts to build the view, both failing, followed by an
uncaught exception error for Futon.
> Based on this, there are likely other areas in the codebase that do not handle the bad_utf8_character_code
exception correctly.
> My belief is that CouchDB shouldn't accept this input and should have rejected the PUT/POST,
or should have escaped the input itself before the insertion.

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