How to use Harmon in SSL proxy server? about harmon HOT 9 CLOSED

no9 commented on September 1, 2024

How to use Harmon in SSL proxy server?

from harmon.

Comments (9)

No9 commented on September 1, 2024

Hi @liuxujim
It isn't clear what you are trying to achieve
It looks like your are trying to hand off the initial request to the proxy to a backend server and have encryption all the way?

from harmon.

liuxujin commented on September 1, 2024

Thanks No9. The problem above has been resolved but I have a new question. How can I append(instead of replacing) a javascript reference(for example: <script type=text/javascript src="sample.js"/>) to the "head" element of the response using Harmon. Does the following look good? Any better solution?

var simpleselect2 = {};
simpleselect2.query = 'head';
simpleselect2.func = function (node) {
    var inData = "<script>alert();</script>";
    var readStream = node.createReadStream();
    readStream.on('data', function(chunk) {
        inData += chunk;
        node.createWriteStream({ outer: false }).end(inData)
    });
}
selects.push(simpleselect2);

from harmon.

liuxujin commented on September 1, 2024

This is the error I got

c:\nodejs\node_modules\harmon\node_modules\trumpet\lib\tokenize.js:76
tokenize.queue([ 'tag-begin', Buffer(m[0]), arg ]);
^
TypeError: Cannot read property '0' of null
at makeFn (c:\nodejs\node_modules\harmon\node_modules\trumpet\lib\tokenize.j
s:76:51)
at SAXStream.parser.(anonymous function) (c:\nodejs\node_modules\harmon\node
_modules\trumpet\lib\tokenize.js:26:50)
at SAXStream.EventEmitter.emit (events.js:95:17)
at Object.me.parser.(anonymous function) [as onopentag](c:nodejsnode_mod
ulesharmonnode_modulestrumpetnode_modulessaxlibsax.js:245:15)
at emit (c:\nodejs\node_modules\harmon\node_modules\trumpet\node_modules\sax
\lib\sax.js:615:33)
at emitNode (c:\nodejs\node_modules\harmon\node_modules\trumpet\node_modules
\sax\lib\sax.js:620:3)
at openTag (c:\nodejs\node_modules\harmon\node_modules\trumpet\node_modules
sax\lib\sax.js:801:3)
at Object.write (c:\nodejs\node_modules\harmon\node_modules\trumpet\node_mod
ules\sax\lib\sax.js:1191:29)
at SAXStream.write (c:\nodejs\node_modules\harmon\node_modules\trumpet\node
modules\sax\lib\sax.js:227:16)
at Stream. (c:\nodejs\node_modules\harmon\node_modules\trumpet\li
b\tokenize.js:18:27)

from harmon.

No9 commented on September 1, 2024

Hi @liuxujim
You are heading in the right direction.
This is more of a trumpet implementation detail and here is a sample of something that you can start working with

index.js

var trumpet = require('trumpet');
var through = require('through');
var tr = trumpet();

tr.selectAll('.b span', function (node) {
            var s = node.createStream();
            s.pipe(through(function (data) {
                s.write(data + " data");
            }))
});

var fs = require('fs');
fs.createReadStream(__dirname + '\\test.html').pipe(tr).pipe(process.stdout);

test.html

<html>
  <head>
    <title>beep</title>
  </head>
  <body>
    <div class="a">¡¡¡</div>
    <div class="b">
      <span>tacos</span>
      <span> y </span>
      <span>burritos</span>
    </div>
    <div class="a">!!!</div>
  </body>
</html>

If you have time I would suggest going through the following tutorial on streams.
It has more details on through which is required in the sample above and is also a very handy utility function.

http://nodeschool.io/#stream-adventure

from harmon.

liuxujin commented on September 1, 2024

Hi Anton, thank you for the response.
The sample you pasted can implement replacing the content of an element, but what I am looking for is appending a new element behind a selected element.
For example, my previous HTML is

<title>This is the title</title> ........ .....

What I want to do is add a javascript behind the <title> element of the . So it should be updated like this:

<title>This is the title</title>

  \<script .....HERE IS SOME JAVASCRIPT CODE.........\>
   ........

.....

I tried the sample code in comment 3, but failed. Can you please advise?

from harmon.

No9 commented on September 1, 2024

Hi
So here is something closer to what you are looking for.
It puts the script tag in before the closing head tag.
The stream seems to be firing per parsed token within the node so we need to
filter it out with an if statement.
The functionality works but my feeling is that when outer:true is used the
data argument should contain the whole node not an event for each token.

index.js

var trumpet = require('trumpet');
var through = require('through');
var tr = trumpet();

tr.selectAll('head', function (node) {
            var s = node.createStream({outer : true });
            s.pipe(through(function (data) {
                //If test is a work around for the event firing  
                //for each token in the selected node.
                //Uncomment the console.dir to reproduce
                //console.dir('fired');
                //Output is 
                //fired <head fired>fired <title fired>fired beep fired<title fired fired

                if(data.toString().indexOf('</head>') > -1) {
                   s.write('<script>alert("hello");</script>');
                }
                s.write(data);
            }))
});

var fs = require('fs');
fs.createReadStream(__dirname + '\\test.html').pipe(tr).pipe(process.stdout);

test.html

<html>
  <head>
    <title>beep</title>
  </head>
  <body>
    <div class="a">¡¡¡</div>
    <div class="b">
      <span>tacos</span>
      <span> y </span>
      <span>burritos</span>
    </div>
    <div class="a">!!!</div>
  </body>
</html>

from harmon.

liuxujin commented on September 1, 2024

Hi Anton, thank you very much for your immediate response. I think your comment should work. But my problem seems a little complicated than that.

What I am implementing

Create a reveres proxy to proxy a remote server(https://:greenhouse.lotus.com/profiles, for example)
Modify the response to inject a script like <script ....></script>

The problem is the response of this remote server is in gzip format, so it looks like if we need to modify the response, we have to (1) read response (2) decompress response (3) modify response (4) re-compress.(5) write response.

My problem is I can finish step 1,2,3,4,but don't know how to implement step5 after step 4. See my sample code below. Please check line 21(forgive me the format, don't know how to make it look better), Not sure if you can help? Or do you have other better solution?

------------------------------

var http = require('http'),
    https = require('https'),
    connect = require('connect'),
    httpProxy = require('http-proxy');
    fs = require('fs'),
    path = require('path'),
    zlib = require('zlib'),
    fixturesDir = path.join(__dirname);

var app = connect();
app.use(function(req, res, next) {
    var _write = res.write;
    res.write = function (data) {
        var zlib = require('zlib');
        zlib.unzip(data, function(err, bufferNew) {
                if (!err) {
                    var newContent = bufferNew.toString().replace("\<head\>", "\<head\>\\n\<script\>alert('test')\</script\>");

                    var buf = new Buffer(newContent, 'utf-8');   
                        zlib.gzip(buf, function (_, result) {  
                          /***********************************************************
                          Need to write back the response, how????
                          res.end(result);                     
                          _write.call(res, result);
                          ***********************************************************/
                    });

                }
        });     
        //_write.call(res, data);
    }

    next();
});
var httpsOpts = {
  //TODO this need to be changed accordingly
  key: fs.readFileSync(path.join(fixturesDir, 'localhost-key.pem'), 'utf8'),
  cert: fs.readFileSync(path.join(__dirname, 'localhost-cer.pem'), 'utf8')
};
var proxySSL = httpProxy.createProxyServer({
      xfwd: true,
      ssl: httpsOpts,
      target: 'https://greenhouse.lotus.com',
      secure: false
    }
);
app.use(function(req, res) {        
    proxySSL.web(req, res);
});
http.createServer(app).listen(80);
https.createServer(httpsOpts, app).listen(443);
-------------------------------------------------------------------

from harmon.

No9 commented on September 1, 2024

Sorry but this is getting off topic for harmon.
You problem is now around connect library usage and I would suggest going to their project as they could give you clearer/better guidance on that.
https://github.com/senchalabs/connect

from harmon.

No9 commented on September 1, 2024

@liuxujim Gzip support and a sample has been added to the repo
https://github.com/No9/harmon/blob/master/examples/gzipped.js

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How to use Harmon in SSL proxy server? about harmon HOT 9 CLOSED

Comments (9)

index.js

test.html

index.js

test.html

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