This lambda runs on two schedules...
- one every minute with
isProcessPermissionChangesOnly: truein its input payload - one every 24hours with an empty input payload.
It looks up which users have Pinboard permission and looks up their details using the Google Admin Directory API (for people's names) and the Google People API (for their avatarUrl - where available).
It stores all these into the User table. Based on the input event it will either process all users or just those who have had their permission changed (compared to the DB).
If people no longer have Pinboard permission, it sets the isMentionable property to false in the User table.
This User information serves various purposes, such as populating the list of people available to 'mention', as well as acting as a lookup for resolving people's names and avatars in the display of each item (meaning we only need to store userEmail against each row in the Item table, rather than repeating all that metadata for every single message).
On the daily 'full run' we also load the map of groups (key: a 'shorthand' for the group, value: any email address associated with the group) from the AWS Param Store, then for each we lookup the group details (via groups.get call) and the group members (via members.list call) and write to the Group and GroupMember tables respectively.