Dongsheng - I am using moodle.jesuitscholar.com as a test server and tried to setup Dropbox repository when navigating to select a file, I receive a message about an invalid JSON string:

Notice: Undefined property: stdClass::$path in /home1/jesuits1/public_html/moodle/repository/dropbox/lib.php on line 134

Notice: Undefined property: stdClass::$contents in /home1/jesuits1/public_html/moodle/repository/dropbox/lib.php on line 163

Warning: Invalid argument supplied for foreach() in /home1/jesuits1/public_html/moodle/repository/dropbox/lib.php on line 164
{"list":[],"path":[

],"manage":false,"dynload":true,"nosearch":true,"repo_id":5}

I took a quick look and the logic about testing for whether $result->path is set seems like it could use a little attention. It seems to be used without being checked for on line 134, then it is checked for being empty and sets a current path. It looks like a general review of the get_listing function could be helpful in cleaning up some whitespacing issues as well.

I'm hoping I have everything entered for this to work. I did enter the Dropbox API key on the Moodle end.

Peace - Anthony