import { isDeepStrictEqual } from "util" ; import * as functions from "firebase-functions" ; import * as admin from "firebase-admin" ; admin . initializeApp ( ) ; const auth = admin . auth ( ) ; const CLAIMS_FIELD = process . env . CLAIMS_FIELD || null ; exports . sync = functions . handler . firestore . document . onWrite ( async ( change ) => { const uid = change . after . id ; try { await auth . getUser ( uid ) ; } catch ( e ) { functions . logger . error ( `Unable to sync claims for user '${ uid }', error:` , e , { uid } ) ; } if ( ! change . after . exists || ( CLAIMS_FIELD && ! change . after . get ( CLAIMS_FIELD ) ) ) { functions . logger . info ( `Claims for user '${ uid }' were deleted, removing from Auth.` , { uid } ) ; return auth . setCustomUserClaims ( uid , null ) ; } const beforeData = ( CLAIMS_FIELD ? change . before . get ( CLAIMS_FIELD ) : change . before . data ( ) ) || { } ; const data = ( CLAIMS_FIELD ? change . after . get ( CLAIMS_FIELD ) : change . after . data ( ) ) || { } ; if ( data . _synced ) { delete data . _synced ; } if ( beforeData . _synced ) { delete beforeData . _synced ; } if ( isDeepStrictEqual ( beforeData , data ) ) { return ; } functions . logger . info ( `Updating claims for user '${ uid }', setting keys ${ Object . keys ( data ) . join ( ", " ) }.` , { uid } ) ; if ( typeof data !== "object" ) { functions . logger . error ( `Invalid custom claims for user '${ uid }'. Must be object, was ${ JSON . stringify ( data ) }` , { uid } ) ; return ; } await auth . setCustomUserClaims ( uid , data ) ; const fpath = [ "_synced" ] ; if ( CLAIMS_FIELD ) { fpath . unshift ( CLAIMS_FIELD ) ; } functions . logger . info ( `Claims set for user '${ uid }', logging sync time to Firestore` , { uid } ) ; return change . after . ref . update ( new admin . firestore . FieldPath ( ... fpath ) , admin . firestore . FieldValue . serverTimestamp ( ) ) ; } ) ;