import { CloudFront } from 'aws-sdk' ; const limitMultiPathsPerInvalidation = 15 ; const limitTotalPathsPerInvalidation = 3000 ; param invalidationPaths returns export function prepareInvalidations ( invalidationPaths ) { let multiPaths = [ ] ; let singlePaths = [ ] ; for ( const invalidationPath of invalidationPaths ) { if ( invalidationPath . endsWith ( '*' ) ) { multiPaths . push ( invalidationPath ) ; } else { singlePaths . push ( invalidationPath ) ; } } multiPaths = multiPaths . sort ( ( a , b ) => b . length - a . length ) . filter ( ( multiPath , index , array ) => { for ( let i = index + 1 ; i < array . length ; i ++ ) { const pathWithoutTail = array [ i ] . substr ( 0 , array [ i ] . length - 1 ) ; if ( multiPath . startsWith ( pathWithoutTail ) ) { return false ; } } return true ; } ) ; singlePaths = singlePaths . filter ( ( singlePath ) => { for ( const multiPath of multiPaths ) { const pathWithoutTail = multiPath . substr ( 0 , multiPath . length - 1 ) ; if ( singlePath . startsWith ( pathWithoutTail ) ) { return false ; } } return true ; } ) ; return [ multiPaths , singlePaths ] ; } param multiPaths param singlePaths param maxMultiPaths param maxTotalPaths returns export function createInvalidationChunk ( multiPaths , singlePaths , maxMultiPaths , maxTotalPaths ) { let pathsChunk = [ ] ; let newSinglePaths = singlePaths ; let newMultiPaths = multiPaths ; const singlePathIndex = Math . min ( singlePaths . length , maxTotalPaths ) ; if ( singlePathIndex > 0 ) { pathsChunk = singlePaths . slice ( 0 , singlePathIndex ) ; newSinglePaths = singlePaths . slice ( singlePathIndex ) ; } const numOfAvailablePathsInChunk = maxTotalPaths - pathsChunk . length ; const numOfAvailableMultiPathsInChunk = Math . min ( numOfAvailablePathsInChunk , maxMultiPaths ) ; if ( numOfAvailableMultiPathsInChunk > 0 ) { pathsChunk . push ( ... multiPaths . slice ( 0 , numOfAvailableMultiPathsInChunk ) ) ; newMultiPaths = multiPaths . slice ( numOfAvailableMultiPathsInChunk ) ; } return [ pathsChunk , newMultiPaths , newSinglePaths ] ; } param invalidationPaths returns export function createInvalidation ( invalidationId , multiPaths , singlePaths ) { const [ pathsChunk , newMultiPaths , newSinglePaths ] = createInvalidationChunk ( multiPaths , singlePaths , limitMultiPathsPerInvalidation , limitTotalPathsPerInvalidation ) ; const cloudFrontInvalidationBatch = { CallerReference : `${ new Date ( ) . getTime ( ) }-${ invalidationId }` , Paths : { Quantity : pathsChunk . length , Items : pathsChunk , } , } ; return [ cloudFrontInvalidationBatch , newMultiPaths , newSinglePaths ] ; }