import type { TransformCallback } from "stream" ; import { Transform } from "stream" ; import { File as BufferFile } from "@web-std/file" ; import { Meter } from "./meter" ; import type { UploadHandler } from "../formData" ; export type MemoryUploadHandlerFilterArgs = { filename : string ; encoding : string ; mimetype : string ; } ; export type MemoryUploadHandlerOptions = { /**
     * The maximum upload size allowed. If the size is exceeded an error will be thrown.
     * Defaults to 3000000B (3MB).
     */ maxFileSize ? : number ; param filename param mimetype param encoding filter ? ( args ) : boolean | Promise < boolean > ; } ; export function createMemoryUploadHandler ( { filter , maxFileSize = 3000000 } ) { return async ( { name , stream , filename , encoding , mimetype } ) => { if ( filter && ! ( await filter ( { filename , encoding , mimetype } ) ) ) { stream . resume ( ) ; return ; } let bufferStream = new BufferStream ( ) ; await new Promise < void > ( ( resolve , reject ) => { let meter = new Meter ( name , maxFileSize ) ; let aborted = false ; async function abort ( error ) { if ( aborted ) return ; aborted = true ; stream . unpipe ( ) ; meter . unpipe ( ) ; stream . removeAllListeners ( ) ; meter . removeAllListeners ( ) ; bufferStream . removeAllListeners ( ) ; reject ( error ) ; } stream . on ( "error" , abort ) ; meter . on ( "error" , abort ) ; bufferStream . on ( "error" , abort ) ; bufferStream . on ( "finish" , resolve ) ; stream . pipe ( meter ) . pipe ( bufferStream ) ; } ) ; return new BufferFile ( bufferStream . data , filename , { type : mimetype } ) ; } ; } class BufferStream extends Transform { public data : any [ ] ; constructor ( ) { super ( ) ; this . data = [ ] ; } _transform ( chunk , _ , callback ) { this . data . push ( chunk ) ; callback ( ) ; } }