User preferences

[jnordberg]

Stored in s3 as file per user: conveyor_${username}_prefs.json

get_user_prefs <username> <key | undefined>
set_user_prefs <username> <object | key-value pair>

Both calls require signature of <username> or admin

[sneak]

make it part of the whole prefs object. there should be a special lang code “xx” which means “whatever the browser sends in headers should be used (aka don’t override with prefs).

[sneak]

the getter for the prefs should provide defaults to the client for any key that is unset.

[sneak]

that way we have a single place for all pref defaults to be set... though maybe we should have the defaults be in condenser and this should only record user-modified ones.

[sneak]

condenser is probably a better place for the sum total defaults, then this object will just override them with set keys. then when we change defaults in condenser, the change is retroactive for users who have not changed from the default setting.

[jnordberg]

Updated to reflect latest spec

Refs #7