POSTing torrent to utorrent webui; base64encoded? General error msg

[dabear]

Hi, i am trying to do a POST request to http://mysite.mine.nu:9000/gui/?action=add-file using gm_xmlhttprequest (greasemonkey extension, provides cross-site ajax) in firefox, but because javascript munges binary content when concatenated with a string, I have no chose but to base64encode the data. Is base64 supported by the utorrent webui?

The reason for me asking, is that although I get a response, I get an error message. The error message isn't that helpful though.

greasemonkey/myscript: fetching url https://someaddress/sometorrent.torrent?passkey=mypasskey
greasemonkey/myscript: Status is:200, attempting to send binary data to url: http://mysite.mine.nu:9000/gui/?action=add-url
greasemonkey/myscript: binary content converted to base64, will now send to http://mysite.mine.nu:9000/gui/?action=add-url
greasemonkey/myscript: Binary sent with base64 encoding. Status is: 200, reponseText is {"build":14458,"error": "Error"}

function sendBinary(binaryContents, url) {
  var base64Encoded = Base64.encode(binaryContents); 
  //var base64Encoded = binaryContents;

  var boundary_string = 'whatever';
  var boundary = '--' + boundary_string + '--' ;
  //try file or form-data as disposition
  var data = boundary + '\r\n'+ 'Content-Disposition: form-data; name="torrent_file"; filename="mytorrent.torrent"\r\n'+
  'Content-Type: application/x-bittorrent\r\n'
  + 'Content-Transfer-Encoding: base64\r\n' 
  + '\r\n'+ base64Encoded + '\r\n'
  + boundary;

  console.log("binary content converted to base64, will now send to " + url)
  GM_xmlhttpRequest({
      method: 'POST',
      url: url,
      headers: {'Content-Type':'multipart/form-data; boundary="'+boundary_string +'"', 'Content-Length':data.length },
      data: data,
      onload: function(response){
        console.log("Binary sent with base64 encoding. Status is: " + response.status + ", reponseText is " + response.responseText);

      },
      onerror: function(){
        alert("error in sending")
      }
  }); 

}

base64.encode is this:

var Base64 = {

    // private property
    _keyStr : "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=",

    // public method for encoding
    encode : function (input) {
        var output = "";
        var chr1, chr2, chr3, enc1, enc2, enc3, enc4;
        var i = 0;

        input = Base64._utf8_encode(input);

        while (i < input.length) {

            chr1 = input.charCodeAt(i++);
            chr2 = input.charCodeAt(i++);
            chr3 = input.charCodeAt(i++);

            enc1 = chr1 >> 2;
            enc2 = ((chr1 & 3) << 4) | (chr2 >> 4);
            enc3 = ((chr2 & 15) << 2) | (chr3 >> 6);
            enc4 = chr3 & 63;

            if (isNaN(chr2)) {
                enc3 = enc4 = 64;
            } else if (isNaN(chr3)) {
                enc4 = 64;
            }

            output = output +
            this._keyStr.charAt(enc1) + this._keyStr.charAt(enc2) +
            this._keyStr.charAt(enc3) + this._keyStr.charAt(enc4);

        }

        return output;
    },

    // public method for decoding
    decode : function (input) {
        var output = "";
        var chr1, chr2, chr3;
        var enc1, enc2, enc3, enc4;
        var i = 0;

        input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");

        while (i < input.length) {

            enc1 = this._keyStr.indexOf(input.charAt(i++));
            enc2 = this._keyStr.indexOf(input.charAt(i++));
            enc3 = this._keyStr.indexOf(input.charAt(i++));
            enc4 = this._keyStr.indexOf(input.charAt(i++));

            chr1 = (enc1 << 2) | (enc2 >> 4);
            chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
            chr3 = ((enc3 & 3) << 6) | enc4;

            output = output + String.fromCharCode(chr1);

            if (enc3 != 64) {
                output = output + String.fromCharCode(chr2);
            }
            if (enc4 != 64) {
                output = output + String.fromCharCode(chr3);
            }

        }

        output = Base64._utf8_decode(output);

        return output;

    },

    // private method for UTF-8 encoding
    _utf8_encode : function (string) {
        string = string.replace(/\r\n/g,"\n");
        var utftext = "";

        for (var n = 0; n < string.length; n++) {

            var c = string.charCodeAt(n);

            if (c < 128) {
                utftext += String.fromCharCode(c);
            }
            else if((c > 127) && (c < 2048)) {
                utftext += String.fromCharCode((c >> 6) | 192);
                utftext += String.fromCharCode((c & 63) | 128);
            }
            else {
                utftext += String.fromCharCode((c >> 12) | 224);
                utftext += String.fromCharCode(((c >> 6) & 63) | 128);
                utftext += String.fromCharCode((c & 63) | 128);
            }

        }

        return utftext;
    },

    // private method for UTF-8 decoding
    _utf8_decode : function (utftext) {
        var string = "";
        var i = 0;
        var c = c1 = c2 = 0;

        while ( i < utftext.length ) {

            c = utftext.charCodeAt(i);

            if (c < 128) {
                string += String.fromCharCode(c);
                i++;
            }
            else if((c > 191) && (c < 224)) {
                c2 = utftext.charCodeAt(i+1);
                string += String.fromCharCode(((c & 31) << 6) | (c2 & 63));
                i += 2;
            }
            else {
                c2 = utftext.charCodeAt(i+1);
                c3 = utftext.charCodeAt(i+2);
                string += String.fromCharCode(((c & 15) << 12) | ((c2 & 63) << 6) | (c3 & 63));
                i += 3;
            }

        }

        return string;
    }

}

[Ultima]

Nope, AFAIK, µTorrent doesn't accept Base64 encoded binary data.

http://blog.footle.org/2007/07/31/binary-multipart-posts-in-javascript/

Have you seen this blog post?

[dabear]

Thanks for answering. Yes, I've seen that post and others. However, that post assumes Components.classes is usable, which is not the case in greasemonkey userscripts.

Well, it _is_ available, but not usable. "Permission denied to get property XPCComponents.classes" will be the error when you access Components.classes from within a greasemonkey script.

before firefox 3.0, you could also ask for permissions to access Components.classes, but that's not allowed either, anymore. So I guess I'm stuck with ?add-url

Error: A script from "http://example.com" was denied UniversalXPConnect privileges.

Here's the code to test that, from within a greasemonkey userscript:

try {
  unsafeWindow.netscape.security.PrivilegeManager.enablePrivilege('UniversalXPConnect');
  var stream = Components.classes["@mozilla.org/network/file-input-stream;1"]  
                        .createInstance(Components.interfaces.nsIFileInputStream);
  alert("worked");
} catch(e){
alert("Didn't work: " + e);
}