I've been working on a project for a client and had a lot of fun integrating SignalR into the system.
Everything seems to work really well and the client is really excited about how the SignalR gives true real-time feedback for their application.
For the most part everything has gone swimmingly, however I've come into a strange issue I simply cannot pin down.
Everything works great for the following locales:
en-US
en-GB
it
nl
However these languages simply never get a callback from the hub:
fr
de
es
en-ZW - we use English Zimbabwe to check all the strings are translated.
I can step through the code right up until Clients.Client(ConnectionId).update(Result); (where ConnectionId is the correct Connection ID, and Result is the object ready to be serialized, with the first four languages this goes flawlessly and I get my Javascript method with the expected output.
On the last four languages however, the method is fired, but nothing comes through to the other side. Nothing. Zip.
If I replace the Strings.fr.resx file with the default Strings.resx then my site functions as expected, but since the Strings.en-ZW.resx file is identical to Strings.resx (only each string is wrapped in [()]) I doubt that is the issue. I also tried using the fr locale with all unicode translations (`, é, â, etc) removed, but that didn't help.
I've been going over this for almost a full day now and found nothing that would indicate the issue, and the fact that en works fine and en-ZW does not really confuses me.
Anyone have any suggestions?
Hub method:
public class ClientHub : Hub
{
[...]
protected void UpdateRecords(List<Int32> ChangedValues)
{
using (var database = new DbContext())
{
foreach (Record R in database.Records.Where(Rc => ChangedValues.Contains(Rc.Id))
{
SignalRFormattedRecord Serialized = new SignalRFormattedRecord(Record);
foreach (SavedFilter Filter in SavedFilters.ByRecord(Record))
{
// Next line is always called.
Clients.Client(Filter.ConnectionId).updateRow(Serialized);
}
}
}
}
[...]
}
Javascript:
$.connection.clientHub.updateRow = function(value) {
debugger;
// update code works in all languages except FR, DE, ES and en-ZW.
}
$.connection.start();
Turns out the filtering system wasn't language agnostic where it should have been, and I was getting false positives due to dangling connections during debug.
I feel quite stupid now.
Related
Update:
Please see the answer noted below as, ultimately, the problem had nothing to do with jsquery.
=============
Issue:
I submit an object to jquery to convert into a serialized string that will become part of a "POST" request to a server, and the data returned from the serialization request is different than the data sent on many occasions.
An example:
The JavaScript code that implements the server POST request:
function send_data(gpg_data) {
var query_string;
query_string = '?' + $.param(gpg_data, traditional = true);
console.log('gpg_data =', gpg_data)
console.log('query_string =', query_string);
$.post(server_address + query_string);
return;
}
This is the structure sent to the jquery param() function.
(copied from the browser console in developer mode.)
gpg_data =
{controller_status: 'Connected', motion_state: 'Stopped', angle_dir: 'Stopped', time_stamp: 21442, x_axis: 0, …}
angle_dir: "Stopped"
controller_status: "Connected"
force: 0
head_enable: 0
head_x_axis: 0
head_y_axis: 0
motion_state: "Stopped"
time_stamp: 21490
trigger_1: 0
trigger_2: 0
x_axis: 0
y_axis: "0.00"
. . . and the returned "query string" was:
query_string = ?controller_status=Connected&motion_state=Stopped&angle_dir=Stopped&time_stamp=21282&x_axis=0&y_axis=0.00&head_x_axis=0&head_y_axis=0&force=0&trigger_1=1&trigger_2=1&head_enable=0
The data received by the server is:
ImmutableMultiDict([('controller_status', 'Connected'), ('motion_state', 'Stopped'), ('angle_dir', 'Stopped'), ('time_stamp', '21282'), ('x_axis', '0'), ('y_axis', '0.00'), ('head_x_axis', '0'), ('head_y_axis', '0'), ('force', '0'), ('trigger_1', '1'), ('trigger_2', '1'), ('head_enable', '0')])
For example, note that "trigger_1" returns 1 when the data sent to it is a zero.
I have tried setting the query to "traditional = true" to revert to an earlier style of query handling as some articles suggested - which did not work. I tried this with jquery 3.2 and 3.6.
I am not sure exactly how jquery manages to munge the data so I have no idea where to look.
I have looked at my script and at the unpacked jquery code, and I can make no sense out of why or how it does what it does.
Any help understanding this would be appreciated.
P.S.
web searches on "troubleshooting jquery" returned very complex replies that had more to do with editing e-commerce web pages with fancy buttons and logins than with simply serializing data.
P.P.S.
I am tempted to just chuck the jquery and write my own serialization routine. (grrrr!)
===================
Update:
As requested, a link to the browser-side context.
To run: unpack the zip file in a folder somewhere and attach an analog joystick/gamepad to any USB port, then launch index.html in a local browser. Note that a purely digital gamepad - with buttons only or with a joystick that acts like four buttons - won't work.
You will want to try moving joystick axes 1 and 2, (programmatically axes 0 and 1) and use the first (0th) trigger button.
You will get a zillion CORS errors and it will complain bitterly that it cannot reach the server, but the server side context requires a GoPiGo-3 robot running GoPiGo O/S 3.0.1, so I did not include it.
Note: This does not work in Firefox as Firefox absolutely requires a "secure context" to use the Gamepad API. It does work in the current version of Chrome, (Version 97.0.4692.99 (Official Build) (64-bit)), but throws warnings about requiring a secure context.
Please also note that I have made every attempt I know how to try to troubleshoot the offending JavaScript, but trying to debug code that depends on real-time event handling in a browser is something I have not figured out how to do - despite continuous searching and efforts. Any advice on how to do this would be appreciated!
======================
Update:
Researching debugging JavaScript in Chrome disclosed an interesting tidbit:
Including the line // #ts-check as the first line in the JavaScript code turns on additional "linting" (?) or other checks that, (mostly) were a question of adding "var" to the beginning of variable declarations.
However. . . .
There was one comment it made:
gopigo3_joystick.x_axis = Number.parseFloat((jsdata.axes[0]).toFixed(2));
gopigo3_joystick.y_axis = Number.parseFloat(jsdata.axes[1]).toFixed(2);
I could not assign gopigo3_joystick.y_axis to a string object, (or something like that), and I was scratching my head - that was one of the pesky problems I was trying to solve!
If you look closely at that second line, you will notice I forgot a pair of parenthesis, and that second line should look like this:
gopigo3_joystick.y_axis = Number.parseFloat((jsdata.axes[1]).toFixed(2));
Problem solved - at least with respect to that problem.
I figured it out and it had nothing to do with jquery.
Apparently two things are true:
The state of the gpg_data object's structure is "computed", (snapshot taken), the first time the JavaScript engine sees the structure and that is the state that is saved, (even though the value may change later on). In other words, that value is likely totally bogus.
Note: This may only be true for Chrome. Previous experiments with Firefox showed that these structures were updated each time they were encountered and the values seen in the console were valid. Since Firefox now absolutely requires a secure context to use the gamepad API, I could not use Firefox for debugging.
I was trying to be "too clever". Given the following code snippet:
function is_something_happening(old_time, gopigo3_joystick) {
if (gopigo3_joystick.trigger_1 == 1 || gopigo3_joystick.head_enable == 1) {
if (old_time != Number.parseFloat((gopigo3_joystick.time_stamp).toFixed(0))) {
send_data(gopigo3_joystick)
old_time = gopigo3_joystick.time_stamp
}
}
return;
}
The idea behind this particular construction was to determine if "something interesting" is happening, where "something interesting" is defined as:
A keypress, (handled separately)
A joystick movement if either the primary trigger or the pinky trigger is pressed.
Movement without any trigger pressed is ignored so that if the user accidentally bumps against the joystick, the robot doesn't go running around.
Therefore the joystick data only gets updated if the trigger is pressed. In other words, trigger "release" events - the trigger is now = 0 - are not recorded.
The combination of these two events - Chrome taking a "snapshot" of object variables once and once only, (or not keeping them current) - and the trigger value persisting, lead me to believe that jquery was the problem since the values appeared to be different on each side of the jquery call.
I'm working on adding WebAuthn support to a newly-minted web site and am running into a problem during the navigator.credentials.get() call. The client is Firefox 85.0 on Fedora 33. In case it matters, the server is Apache httpd on Fedora 33. The token is either a Yubikey 4 or a Yubikey 5NFC (the results are the same). This is the function making the API call. Obviously the credential IDs hard-coded here are for testing, not part of the final product:
function handleUserAuthenticationResponse(r) {
var cid1 = {type: "public-key", id: base64ToArrayBuffer("gL0Ig10uA2tn8L0kn2L9FoGqIPSrqvc1lLBwgQhcVDa200b1P94kPv94T6O1bDZyYRrfLbTrLRsubDxuYUxHCg==")};
var cid2 = {type: "public-key", id: base64ToArrayBuffer("tjW1RPqtAJm69I/qeV7eRFJx6h87J3NPeJ/hhbkjttcCc2BWHQ2v2nueoKBSGabw1eYsT8S+lhJv1l1mYWX+Uw==")};
var options = {
rpID: "http://localhost",
challenge: base64ToArrayBuffer(r.challenge),
allowCredentials: [cid1,cid2],
timeout: 60000
};
if (!window.PublicKeyCredential) {
throw new Error("Unable to access credentials interface");
}
navigator.credentials.get({"publicKey":options})
.then(assertion => handleTokenAssertion(assertion))
.catch(e => {console.log("Error fetching token assertion:",e);});
}
function base64ToArrayBuffer(base64) {
var binary_string = window.atob(base64);
var len = binary_string.length;
var bytes = new Uint8Array(len);
for (var i = 0; i < len; i++) {
bytes[i] = binary_string.charCodeAt(i);
}
return bytes.buffer;
}
function handleTokenAssertion(a) {
alert("Got an assertion!");
}
Everything seems to work, the Yubikey LED blinks, I press the touchpad, but then I get back an exception:
Error fetching token assertion: DOMException: An attempt was made to use an object that is not, or is no longer, usable
This seems to be a bit of a Firefox catch-all. It could indicate that the token doesn't match one of the allowedCredentials[], or perhaps other things. It's hard to tell. The FIDO2 credential on the Yubikey was created with fido2-cred(1) tool packaged with the libfido2 source. In this case the credentialId is from the fido2-cred -M output:
CuCEGL10uPhBmNCY4NsGaAz0gir/68UMGFQn0pfb6tc=
http://localhost
fido-u2f
WMSGBbi6CMINQvnkVRUYcYltDg3pgFlihvtzbRHuwBPipEEAAAAAAAAAAAAAAAAAAAAAAAAAAABAgL0Ig10uA2tn8L0kn2L9FoGqIPSrqvc1lLBwgQhcVDa200b1P94kPv94T6O1bDZyYRrfLbTrLRsubDxuYUxHCqUBAgMmIAEhWCA5itRRCBO0lnsztvPvI1waVZLBCZ1XMJjOvlN2oZmBCyJYILFaRjThs5Paj1sOp81iID1LpUBYHJhp4dizC0eI/RrE
gL0Ig10uA2tn8L0kn2L9FoGqIPSrqvc1lLBwgQhcVDa200b1P94kPv94T6O1bDZyYRrfLbTrLRsubDxuYUxHCg==
MEQCIFfs8PagKhNnDgzxfurVzdkTDVTT6ixKk0ak/2qrbSPUAiAf64w390rX1cyY58JgSC/Ac97w6TLcYKuqxOSn5lxV0g==
<long assertion certificate>
You can see the credentialId on line 5, and that it matches cid1 in the Javascript function. Furthermore, if I request an assertion from the token using this credentialId and all else identical (except the challenge) with fido2-assert -G, everything works fine: I get the assertion and it verifies correctly using fido2-assert -V.
Without a more meaningful diagnostic it's hard to know what to try, so I thought I would ask here and see if anyone has any hints. Perhaps I've made some basic error with either Javascript or the credentials API?
Thanks!
UPDATE: One possibility I thought might be worth trying was removing the scheme from the RP ID but that made no difference.
UPDATE: Looking at the firefox source code, the error is apparently NS_ERROR_DOM_INVALID_STATE_ERR, which covers several different situations but in this case is most likely a translation of U2F_ERROR_INVALID_STATE (in dom/webauthn/U2FHIDTokenManager.h). U2F_ERROR_INVALID_STATE, in turn, is defined in third_party/rust/authenticator/src/u2fhid-capi.h as a simple numerical value (3), with no indication of where the value came from. Perhaps it's defined by the underlying HID driver for the Yubikey, but it's not clear what driver that corresponds to. The hunt continues...
It turns out that the problem was indeed the format of the relying party ID. Based on example code from the net (which may have worked with other browsers or versions of the code?), I initially used the full scheme://domain format for the rpID (so in my code above, http://localhost), but it turns out that what's needed is just the domain (localhost). Modifying the rpID in this way allows the assertion process to succeed.
Initially I thought this did not work, but it turned out that I'd simply forgotten to commit the change. Having belatedly done that, it works.
https://github.com/gg2001/monero/blob/master/monero/NewWallet.js
I have a js file that is quite large 6000 lines and JavaScript core does not seem to be able to retrieve variable values whereas running the same file in any web browser works fine for me. When I try to retrieve the value of a variable it shows up as undefined, but when I use a js console in a browswer it shows up fine. I am speculating that this is due to the size of the file because when I put
var helloWorld = "Hello World";
in the front of the js file this swift code can retrieve it
func helloWorld() {
if let variableHelloWorld = self.jsContext.objectForKeyedSubscript("helloWorld") {
print(variableHelloWorld.toString())
}
}
but when I put it at the end it cannot.
Normally this indicates a parsing error. Try adding an error handler to self.jsContext before calling objectForKeyedSubscript() and see if it outputs anything insightful.
self.jsContext.exceptionHandler = { context, exception in
print("JS Error: \(exception?.description ?? "unknown error")")
}
Although your JS code may be valid in a browser console, iOS Safari doesn't support as many Javascript features as newer browsers.
I did see a line in your JS source code beginning with just a semicolon (followed immediately by (function). I wonder if the parser might complain about an empty line without a statement..? Maybe nothing, though.
I am in the process of setting up a blog through blogger.com and used a template from veethemes.com to get me started.
However, I noticed that there's an obfuscated script in the template and I'd prefer to know what it does to ensure that nothing untowards or unwanted is being done.
The code is as follows:
var 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eval(function(_0x6c60x1,_0x6c60x2,_0x6c60x3,_0x6c60x4,_0x6c60x5,_0x6c60x6)
{_0x6c60x5=function(_0x6c60x3){return (_0x6c60x3<_0x6c60x2?_0x378a[4]:_0x6c60x5(
parseInt(_0x6c60x3/_0x6c60x2)))+((_0x6c60x3=_0x6c60x3%_0x6c60x2)>35?String[_0x378a[5]]
(_0x6c60x3+29):_0x6c60x3.toString(36))};if(!_0x378a[4][_0x378a[6]]
(/^/,String)){while(_0x6c60x3--){_0x6c60x6[_0x6c60x5(_0x6c60x3)]=_0x6c60x4[_0x6c60x3]||_0x6c60x5(_0x6c60x3)};
_0x6c60x4=[function(_0x6c60x5){return _0x6c60x6[_0x6c60x5]}];_0x6c60x5=function(){return _0x378a[7]};_0x6c60x3=1;};
while(_0x6c60x3--){if(_0x6c60x4[_0x6c60x3])
{_0x6c60x1=_0x6c60x1[_0x378a[6]]( new
RegExp(_0x378a[8]+_0x6c60x5(_0x6c60x3)+_0x378a[8],_0x378a[9]),
_0x6c60x4[_0x6c60x3])}};return _0x6c60x1;}(_0x378a[0],62,92,_0x378a[3]
[_0x378a[2]](_0x378a[1]),0,{}));
I was able to decode the first part using ddecode.com and came up with the following:
var _0x378a=["k E(s,n){y s.w(/<\/?(?!S\s*\/?)[a-z][a-T-9]*[^<>]*>/L,"").K(/\s+/).17(0,n-1).Z(' ')}k 11(e,t,n,h,c,b,q){5 r=j.f(e);5 i=j.f(n);5 c=c;5 b=b;5 s="";5 o=r.19("A");5 a=X;5 p="";5 16="u.M(W.8, '10', '12=Y, 13=14, 18=x, 15=x, O, N'); y P;";I(o.Q>=1){s='<3 6="V-U"><a 8="'+t+'"><A 6="R" v="'+o[0].v.w(/s\B\d{2,4}/,'s'+1o)+'" 1q=""/></a></3>';a=1s}5 g='<3 6="1r"><3 6="1t"><3 6="C"><7 6="1a">'+b+'</7><7 6="1p"><a 8="'+t+'#1m">'+c+'</a></7></3><D><a 8="'+t+'">'+n+'</a></D><3 6="C 1f"><7 6="q">1e 1n '+q+'</7><7 6="h">1d '+h+'</7></3></3>'+s+'<3 6="1b"><p>'+E(r.m,a)+' [.....]</p></3></3>';r.m=g};u.1c=k(){5 e=j.f("1g");I(e==1h){u.1l.8="J://F.G.l"}e.H("8","J://F.G.l/");e.H("1k","1j");e.m="1i.l"}","|","split","|||div||var|class|span|href|||tag|comment|||getElementById||date||document|function|com|innerHTML||||author||||window|src|replace|24|return||img||meta|h2|stripTags|www|veethemes|setAttribute|if|http|split|ig|open|resizable|scrollbars|false|length|article_img|br|z0|media|post|this|summary_noimg|550|join|windowName|rm|width|height|600|top|popup|slice|left|getElementsByTagName|article_tags|article_excerpt|onload|on|posted|post_meta|attri_bution|null|VeeThemes|dofollow|rel|location|comments|by|700|article_comments|style|article_container|summaryi|article_header","","fromCharCode","replace","\w+","\b","g"];
If I remove the script, the site breaks in certain places like Read More no longer cuts off the article on the home page and post headers are no longer visible, etc.
Any help in decoding this or tips on tools that may be available that would help me would be much appreciated.
Just remove eval in the code and throw it in the developer console.
Our lab recently got an Agilent Bravo pipetting robot (it precisely dispenses tiny quantities of liquid for doing rapidly doing many biology or chemistry experiments). Apparently the glue language for extending the software that controls the robot is Javascript! I know, right?
Anyway, for the robot to be useful, we have to be able to retrieve information about the samples it's handling but every example I can find for sending queries in Javascript depends on PHP and usually the assumption that the script is running in a web-browser.
Is there some way to wrap a command-line mysql or is there already some library or utility that does this? The OS we're running is Windows 7.
Wow, thanks for the quick and useful answers.
In addition, I found a platform-specific answer: http://www.velocity11.com/techdocs/helpsystem/vworks_ug/usingjavascriptinvworks.html
Long story short, VWorks (control software for Agilent's equipment) has a run() global function that does exactly that. But, the above answers are probably more useful to this site than my own is, because they are relevant to a broader range of problems, so thanks again.
"sending queries in Javascript depends on PHP"
no it doesn't.
Just send retreive data(json) using ajax, I'd use http://api.jquery.com/jQuery.ajax/.
Yes, you can use ADO with Javascript on Windows to access various data sources. Search for "jscript ado" and you will get lots of information on this, e.g.:
// path to database
var DBpath="\\\\Server\\Path\\myDB.mdb"
// set up a few object constants
var adLockReadOnly=1
var adOpenForwardOnly=0
var adCmdText=1
// create and open a new connection (MSAccess)
var cnn=new ActiveXObject("ADODB.connection")
cnn.Provider = "Microsoft.Jet.OLEDB.4.0;Data Source=" + DBpath
try
{
cnn.open
}
catch(err)
{
// could not open connection
// view details in err.Description and err.Number
return 0
}
//open a read only recordset
var rs = new ActiveXObject("ADODB.Recordset")
try
{
rs.Open("Select * from myTable", cnn, adOpenForwardOnly, adLockReadOnly)
}
catch(err)
{
// could not open recordset
return 0
}
while(!rs.EOF)
{
// do something
rs.movenext
}
rs.close
Update:
According to info here, you can develop plugins using Visual Studio/C#. Maybe that is of some use? You could write a plugin to send the data somewhere...