A quick little script to get the internal OAuth API token from Gitter desktop (Mac).

get_token.sh

cat query.sql | sqlite3 ~/Library/Caches/com.troupe.gitter.mac.Gitter/Cache.db
plutil -convert xml1 /tmp/request_object.plist
cat /tmp/request_object.plist | grep Bearer

query.sql

SELECT Writefile('/tmp/request_object.plist', b.request_object) 
FROM   cfurl_cache_response AS r 
       INNER JOIN cfurl_cache_blob_data AS b 
               ON r.entry_id = b.entry_id 
WHERE  r.request_key LIKE '%/api/private/%' 
LIMIT  1