subnub
89 lines
2.5 KiB
TypeScript
89 lines
2.5 KiB
TypeScript
import { EventEmitter } from "stream";
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import { UserInterface } from "../../../models/user-model";
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import { Response } from "express";
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import ForbiddenError from "../../../utils/ForbiddenError";
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import NotFoundError from "../../../utils/NotFoundError";
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import crypto from "crypto";
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import { createGenericParams } from "./storageHelper";
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import { getStorageActions } from "../actions/helper-actions";
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import FileDB from "../../../db/mongoDB/fileDB";
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const fileDB = new FileDB();
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const storageActions = getStorageActions();
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const proccessData = (res: Response, fileID: string, user: UserInterface) => {
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const eventEmitter = new EventEmitter();
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const processFile = async () => {
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try {
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const currentFile = await fileDB.getFileInfo(fileID, user._id.toString());
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if (!currentFile) throw new NotFoundError("Download File Not Found");
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const password = user.getEncryptionKey();
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if (!password) throw new ForbiddenError("Invalid Encryption Key");
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const IV = currentFile.metadata.IV;
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const readStreamParams = createGenericParams({
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filePath: currentFile.metadata.filePath,
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Key: currentFile.metadata.s3ID,
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});
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const readStream = storageActions.createReadStream(readStreamParams);
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const CIPHER_KEY = crypto.createHash("sha256").update(password).digest();
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const decipher = crypto.createDecipheriv("aes256", CIPHER_KEY, IV);
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decipher.on("error", (e: Error) => {
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eventEmitter.emit("error", e);
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});
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readStream.on("error", (e: Error) => {
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eventEmitter.emit("error", e);
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});
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res.on("error", (e: Error) => {
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eventEmitter.emit("error", e);
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});
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res.set("Content-Type", "binary/octet-stream");
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res.set(
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"Content-Disposition",
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'attachment; filename="' + currentFile.filename + '"'
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);
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res.set("Content-Length", currentFile.metadata.size.toString());
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readStream
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.pipe(decipher)
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.pipe(res)
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.on("finish", () => {
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eventEmitter.emit("finish");
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});
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} catch (e) {
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eventEmitter.emit("error", e);
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}
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};
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processFile();
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return eventEmitter;
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};
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const getFileData = (res: Response, fileID: string, user: UserInterface) => {
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return new Promise((resolve, reject) => {
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const eventEmitter = proccessData(res, fileID, user);
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eventEmitter.on("finish", (data) => {
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resolve(data);
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});
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eventEmitter.on("error", (e) => {
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reject(e);
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});
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});
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};
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export default getFileData;
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