的NodeJS / EX preSS和POST二进制数据 [英] nodejs/express and binary data in POST
问题描述
我想二进制数据发送到一个前preSS应用程序。它工作正常,只要我的值小于0x80的小。如果一个值是0x80的或更大,它搅乱了整个缓冲区。
防爆preSS处理程序:
=二进制需要('二进制');exports.api =功能(REQ,RES){
VAR体= req.body.name;
VAR BUF =新的缓冲区(身体,'二进制'); 的console.log(身体,req.body);
的console.log('REQ身体LEN,body.length);
的console.log('BUF LEN,buf.length); 变种G = binary.parse(BUF)
.word16bu('A')// 16位无符号大端值
.word16bu(B)。瓦尔 的console.log('G.A',G.A);
的console.log('g.b',g.b); res.send(与资源应对);
};
Python客户端(内容类型:应用程序/ x-WWW的形式urlen codeD):
进口要求
从进口结构包
#发送两个符号短裤(每个16位)。
requests.post(的http://本地主机:3000 / API,数据= {'名':'HH'包(1,2)})
防爆preSS输出,当数据= 1,2。 这是我期望什么
{体名称:\\ u0000的\\ U0001 \\ u0000的\\ u0002'}
REQ体LEN 4
BUF LEN 4
1 G.A
g.b 2
POST / API 200毫秒 - 23B
防爆preSS输出,当数据= 1,0xFF。这是有趣的是,9520实际上0x25的0x30十六进制,相当于0%的ASCII是。是的,这似乎是在解析%00%01 ...字符串。 我希望我能知道如何prevent这个!
{体名称:%00%01%00%FF'}
REQ体len个12
BUF LEN 12
9520 G.A
g.b 12325
POST / API 200 2MS - 23B
这竟然是一个编码问题。一切似乎默认为'UTF8',但在这种情况下,需要将其设置为'二进制
例如:
VAR BUF =新的缓冲区(body.toString('二进制'),'二进制');
同样重要的是,我需要设置多方的NodeJS解析器的编码为二进制。请参阅: https://github.com/superjoe30/node-multiparty/issues/37一>
I'm trying to send binary data to an express app. It works fine, as long as my values are smaller than 0x80. If a single value is 0x80 or greater, it messes up the whole buffer.
Express Handler:
binary = require('binary');
exports.api = function(req, res){
var body = req.body.name;
var buf = new Buffer(body,'binary');
console.log('body',req.body);
console.log('req body len', body.length);
console.log('buf len', buf.length);
var g = binary.parse(buf)
.word16bu('a') // unsigned 16-bit big-endian value
.word16bu('b').vars
console.log('g.a', g.a);
console.log('g.b', g.b);
res.send("respond with a resource");
};
Python client (Content-Type: application/x-www-form-urlencoded):
import requests
from struct import pack
# send two unsigned shorts (16-bits each).
requests.post('http://localhost:3000/api', data={'name':pack('!HH',1,2)})
Express output when data = 1,2. This is what I'd expect.
body { name: '\u0000\u0001\u0000\u0002' }
req body len 4
buf len 4
g.a 1
g.b 2
POST /api 200 1ms - 23b
Express output when data = 1,0xFF. It's interesting to note that 9520 is actually 0x25 0x30 in hex, which corresponds to "%0" in ASCII. Yes, it appears to be parsing the '%00%01...' string. I wish I knew how to prevent this!!!
body { name: '%00%01%00%FF' }
req body len 12
buf len 12
g.a 9520
g.b 12325
POST /api 200 2ms - 23b
It turned out to be an encoding issue. Everything seems to default to 'utf8', but in this case it needs to be set to 'binary'.
For example:
var buf = new Buffer(body.toString('binary'),'binary');
Equally as important, I needed to set nodejs multiparty parser's encoding to 'binary'. See: https://github.com/superjoe30/node-multiparty/issues/37
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