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파일 업로드 방식을 Chunking 방식으로 변경

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static
2026-01-11 04:45:21 +09:00
parent b9e6f17b0c
commit 4b783a36e9
30 changed files with 667 additions and 315 deletions
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34
src/lib/modules/file/download.svelte.ts
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@@ -1,6 +1,7 @@
import axios from "axios";
import { limitFunction } from "p-limit";
import { decryptData } from "$lib/modules/crypto";
import { CHUNK_SIZE, ENCRYPTION_OVERHEAD } from "$lib/constants";
import { decryptChunk, concatenateBuffers } from "$lib/modules/crypto";
export interface FileDownloadState {
id: number;
@@ -62,15 +63,24 @@ const requestFileDownload = limitFunction(
);
const decryptFile = limitFunction(
async (state: FileDownloadState, fileEncrypted: ArrayBuffer, dataKey: CryptoKey) => {
async (
state: FileDownloadState,
fileEncrypted: ArrayBuffer,
encryptedChunkSize: number,
dataKey: CryptoKey,
) => {
state.status = "decrypting";
const fileBuffer = await decryptData(
fileEncrypted.slice(12),
fileEncrypted.slice(0, 12),
dataKey,
);
const chunks: ArrayBuffer[] = [];
let offset = 0;
while (offset < fileEncrypted.byteLength) {
const nextOffset = Math.min(offset + encryptedChunkSize, fileEncrypted.byteLength);
chunks.push(await decryptChunk(fileEncrypted.slice(offset, nextOffset), dataKey));
offset = nextOffset;
}
const fileBuffer = concatenateBuffers(...chunks).buffer;
state.status = "decrypted";
state.result = fileBuffer;
return fileBuffer;
@@ -78,7 +88,7 @@ const decryptFile = limitFunction(
{ concurrency: 4 },
);
export const downloadFile = async (id: number, dataKey: CryptoKey) => {
export const downloadFile = async (id: number, dataKey: CryptoKey, isLegacy: boolean) => {
downloadingFiles.push({
id,
status: "download-pending",
@@ -86,7 +96,13 @@ export const downloadFile = async (id: number, dataKey: CryptoKey) => {
const state = downloadingFiles.at(-1)!;
try {
return await decryptFile(state, await requestFileDownload(state, id), dataKey);
const fileEncrypted = await requestFileDownload(state, id);
return await decryptFile(
state,
fileEncrypted,
isLegacy ? fileEncrypted.byteLength : CHUNK_SIZE + ENCRYPTION_OVERHEAD,
dataKey,
);
} catch (e) {
state.status = "error";
throw e;