When error "master key and slave key don't exist" is raised encrypted field not visible about cozy-data-system

[ZeHiro]

After restarting the stack, everything is back

[clochix]

Hi ZeHiro,
This error is thrown when the stack has been restarted and an application try to access some password in database before the user connects.
Password are encrypted with your instance password as key. When you first connect, we keep it in memory to decrypt content from the data system when applications need it. If your server is restarted, the password is lost and application are unable to decrypt data before you log again. So application don't see encrypted data between a restart and your next connection.

[ZeHiro]

That'a what I understood. Should'nt the app stopped or restarted in this case?

[clochix]

@poupotte will give you a more precise answer, but be patient, she's AFK for some days.

[frankrousseau]

It mostly happens with Konnectors. I will try to understand what happens with this app. It will probably help to solve the problem.

[aenario]

It is caused by the .save calls and goes like this :
Application get the document
GET /data/23723823872
{doctype: X, password: 'stillencryptedblob' or undefined }

Then, it does a .save
PUT /data/23723823872
{doctype: X, password: 'stillencryptedblob' or undefined, lastSync: now}

And the DS store the password twice encrypted (or encrypted with "undefined" as the key, or something weird like that). We should probably prevent GETing something if we cant decrypt it and avoid usage of the .save method in the applications.