我开始学习NodeJS,并开始制作一个小型应用程序,根据用户单击请求对文件进行加密和解密。下面的代码在第一个加密请求上运行良好,但在另一个请求上崩溃。
App.js
var fs = require('fs')
var crypto = require('crypto')
const express = require('express')
const app = express()
const port = 3000
var key = '1bd';
var cipher = crypto.createCipher('aes-256-cbc', key);
var decipher = crypto.createDecipher('aes-256-cbc', key);
app.use(express.static('public'))
app.get('/', (req, res) => {
res.sendFile('/enc-dec.html', { root: __dirname })
})
app.post('/encrypt', (req, res) => {
fs.createReadStream('input.txt')
.pipe(cipher)
.pipe(fs.createWriteStream('input.txt.enc'))
.on('finish', function() {
res.end("Encrypted")
});
})
app.listen(port, () => console.log(`App listening on port ${port}!`))
错误:
NodeError: write after end
at writeAfterEnd (_stream_writable.js:237:12)
at Cipher.Writable.write (_stream_writable.js:287:5)
at ReadStream.ondata (_stream_readable.js:646:20)
at ReadStream.emit (events.js:180:13)
at addChunk (_stream_readable.js:269:12)
at readableAddChunk (_stream_readable.js:256:11)
at ReadStream.Readable.push (_stream_readable.js:213:10)
at fs.read (fs.js:2123:12)
at FSReqWrap.wrapper [as oncomplete] (fs.js:680:17)
Emitted 'error' event at:
at Cipher.onerror (_stream_readable.js:670:12)
at Cipher.emit (events.js:180:13)
at writeAfterEnd (_stream_writable.js:239:10)
at Cipher.Writable.write (_stream_writable.js:287:5)
[... lines matching original stack trace ...]
at fs.read (fs.js:2123:12)
我不是那方面的专家,但是 fs 似乎存在问题。任何帮助将不胜感激。谢谢!
答案 0 :(得分:1)
您的问题是您多次重复使用相同的密码。在流中使用一次后,将无法重用;必须创建一个新的。
您应在请求处理程序中创建密码,如下所示:
multipart/form-data
您似乎还没有完成解密功能,但是在构建解密功能时,还需要将app.post('/encrypt', (req, res) => {
var cipher = crypto.createCipher('aes-256-cbc', key);
fs.createReadStream('input.txt')
.pipe(cipher)
.pipe(fs.createWriteStream('input.txt.enc'))
.on('finish', function() {
res.end("Encrypted")
});
})
下移到请求处理程序中,因为解密器也无法重复使用。