Develop Reference

CefSharp Javascript registration and execution is not working in Release 79.1.36

I tried to upgrade CefSharp from Version 69.0.0.0 to 79.1.36.
I could not get the Javascript interaction working.
The registration changed from
this.Browser.RegisterJsObject
to
this.Browser.JavascriptObjectRepository.Register
according to https://github.com/cefsharp/CefSharp/issues/2990.
When I execute EvaluateScriptAsync, I get a response back with Status Canceled.
Trying to understand how to implement it correctly, I examined the CefSharp.WpfExample and noticed that the Javascript functionality in the example WPF application does not work either.
The Execute Javascript (asynchronously) does not do anything when clicking the Run button.
The Evaluate Javascript (Async) returns:
Uncaught ReferenceError: bound is not defined # about:blank:1:0
Did the Javascript functionality break in the latest release?
Update
Here is how it is used in our code.
This is the registration
public void RegisterJavaScriptHandler(string name, object handler)
{
try
{
CefSharpSettings.LegacyJavascriptBindingEnabled = true;
this.Browser.JavascriptObjectRepository.Register(name, handler, false, new BindingOptions() { CamelCaseJavascriptNames = false });
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
This is the EvaluateScriptAsync part
public void InitializeLayers()
{
try
{
int count = _mapLogic.Layers.Count();
foreach (WMSLayer layer in _mapLogic.Layers)
{
if (!_loadedLayers.Contains(layer))
{
var script = string.Format("addWMSLayer('{0}', '{1}', '{2}', '{3}', '{4}', '{5}', '{6}', '{7}', '{8}', '{9}')",
layer.ProviderCode.Url, layer.AttributionText, layer.AttributionHref,
layer.Layer, layer.FormatCode.Format, layer.ServerType, layer.Res1, layer.Res2, layer.Res3, layer.Res4);
var response = this.ECBBrowser.Browser.EvaluateScriptAsync(script, new TimeSpan(0, 0, 1));
response.ContinueWith(t =>
{
count--;
if (count == 0) this.initializeMap();
});
_loadedLayers.Add(layer);
}
else
{
count--;
if(count == 0) this.initializeMap();
}
}
}
catch (Exception ex)
{
Console.WriteLine(ex);
}
}
Update II
I now believe something has changed with the resource loading.
This is what I have (unimportant parts are left out).
public class ECBSchemeHandler : IResourceHandler
{
private string _mimeType;
private Stream _stream;
public bool Open(IRequest request, out bool handleRequest, ICallback callback)
{
var result = open(request, callback);
handleRequest = result;
return result;
}
public bool Read(Stream dataOut, out int bytesRead, IResourceReadCallback callback)
{
return read(dataOut, out bytesRead, callback);
}
public bool ReadResponse(Stream dataOut, out int bytesRead, ICallback callback)
{
return read(dataOut, out bytesRead, callback);
}
private bool open(IRequest request, ICallback callback)
{
var u = new Uri(request.Url);
var file = u.Authority + u.AbsolutePath;
var ass = Assembly.GetExecutingAssembly();
var resourcePath = ECBConfiguration.DEFAULT_ASSEMBLY_NAMESPACE + "." + file.Replace("/", ".");
if (ass.GetManifestResourceInfo(resourcePath) != null)
{
Task.Run(() =>
{
using (callback)
{
_stream = ass.GetManifestResourceStream(resourcePath);
var fileExtension = Path.GetExtension(file);
_mimeType = ResourceHandler.GetMimeType(fileExtension);
callback.Continue();
}
});
return true;
}
else
{
callback.Dispose();
}
return false;
}
private bool read(Stream dataOut, out int bytesRead, IDisposable callback)
{
callback.Dispose();
if (_stream == null)
{
bytesRead = 0;
return false;
}
//Data out represents an underlying buffer (typically 32kb in size).
var buffer = new byte[dataOut.Length];
bytesRead = _stream.Read(buffer, 0, buffer.Length);
dataOut.Write(buffer, 0, buffer.Length);
return bytesRead > 0;
}
}
}

Using the built-in ResourceHandlers as pointed out by #amaitland solved the problem with the Javascript registration.

How to read a Javascript file

I have a file a /path/to/my_js_functions.js that contains a Javascript function my_js_functions(), amongst other functions.
How can I go about reading the function myJsFunction as a String in C++?
I am looking for a way to get the whole function and only that function, and then contain it in a char *jsFunction.
function myJsFunction(stringParam) {
return stringParam // The function returns a stringParam from the parameter
}
function anotherJsFunction(stringParam) {
return stringParam // Another function
}
Thank you all in advance.

Using fstream, I would read line by line and check whether each line contains the sequence myJsFunction. If a line does contain this sequence, then you begin aggregating to a string until you reach the next function (stopping after you reach the next keyword "function" or something of that sort). Note that using } as a keyword may not work as functions are likely to have multiple closing braces.
Another possible solution could include identifying the end of the function by noticing that when a newline is immediately followed by non-whitespace a new function is beginning, assuming the code in your file is formatted where anything lower in scope is tabbed over correctly.

To do this you need to read your javascript code file and parse it. It is highly to use some parser library to do that like cashew,esprima-cpp. I never used that before I never used any of this before, So I can't comment on that.
But here is some quick code for parser. You can start with this build on this to make it more robust.
main.cpp
#include <fstream>
#include <iostream>
#include <streambuf>
#include <string>
#include <vector>
std::string getFunction(const std::string &fileData, const std::string &name) {
std::string ret;
std::size_t start = 0;
while (true) {
const auto fNameStart = fileData.find(name, start);
if (fNameStart != std::string::npos) {
auto fStart = fileData.find_last_not_of(" ",fNameStart-1);
if(fStart == std::string::npos){
ret = "No Function Defination";
break;
}
else {
fStart = fStart-7;
if(fileData.substr(fStart,8) == "function"){
int openBraceCount = 0, closeBraceCount = 0;
std::size_t fEnd = fNameStart + name.size();
fEnd = fileData.find_first_of("{}", fEnd);
while (fEnd != std::string::npos) {
if (fileData.at(fEnd) == '{') {
openBraceCount++;
} else {
closeBraceCount++;
}
if (openBraceCount == closeBraceCount) {
ret = fileData.substr(fStart, fEnd - fStart+1);
break;
}
fEnd++;
fEnd = fileData.find_first_of("{}", fEnd);
}
if(!ret.empty()){
break;
}
else if(openBraceCount != closeBraceCount){
ret = "Function Parse Error";
break;
}
}
else{
start = fNameStart + name.size();
}
}
} else {
ret = "No Function Defination";
break;
}
}
return ret;
}
int main(int argc, char **argv) {
const std::string jsPath = "module.js";
const std::vector<std::string> vecFuncNames{"funcA", "funcB", "funcC",
"funcD", "funcE"};
std::ifstream fs(jsPath);
if (fs.is_open()) {
std::string fileData((std::istreambuf_iterator<char>(fs)),
std::istreambuf_iterator<char>());
for (auto &name : vecFuncNames) {
std::cout << name << "\n" << getFunction(fileData, name) << std::endl;
}
}
return 0;
}
module.js
function funcA ( ){
funcC(); console.log(" Hello");funcB();
}function funcC(){funcB();console.log("Hello");funcA();}
function funcB(a, b, c){
funcA(); setTimeout(function(){ alert("Hello"); }, 3000);funcC();
}
funcD();
function funcE(){{{{}}}

You can simply doing this
For example /path/code.js is the path your code stored
Your code.js
function myJsFunction(stringParam) {
return stringParam // The function returns a stringParam from the parameter
}
function anotherJsFunction(stringParam) {
return stringParam // Another function
}
module.exports = {
myJsFunction,
anotherJsFunction
}
And this is the file that you use to read the function you write
index.js
const code = require('/path/code.js');
console.log(code), it will be showing your whole code in your code.js file
If you want to make it string, you can use syntax like this. Add this in code below on your index.js file and it will make string version of your code.
String(code.myJsFunction)

How to unpack JavaScript codes on Android?

I know a website(http://jsbeautifier.org/) can unpack JavaScript codes. But my question is how to unpack JavaScript codes on Android. Is there an API can do this?
origin codes:
eval(function(p,a,c,k,e,d){e=function(c){return(c<a?'':e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--){d[e(c)]=k[c]||e(c)}k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1};while(c--){if(k[c]){p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c])}}return p}('(11(){Z{4 2="0.1|17.8|16.8|15.8|18.c|19.c",2=2.14("|");4 a=1b.1a;6(a){4 b=a.1c(/([a-q-r-9\\-]+\\.[a-q-r-9\\-]+)[:\\/]/i);6(b!=Y){10(4 i=0;i<2.s;i++){6(b[1]==2[i]){13}12 6(i==2.s-1){1n 1p 1q("1s\'t 1l 1g")}}}}}1e(e){p.u.v="7://1i.1k.c/"+"?1j="+1t(p.u.v)}})();1h[\'1f\']({"1d":{"o":"7:\\/\\/x.w.z.h:f\\/d\\/g\\/n\\/A\\/l.k?j=m&y=&D=X&Q=0&P=3&R=O&U=5&T=V&W=S&M=-F&E=3&N=5&B=&C=&G=&H=&L=K","J":"I"},"1r":{"o":"7:\\/\\/x.w.z.h:f\\/d\\/g\\/n\\/A\\/l.k?j=m&y=&D=X&Q=0&P=3&R=O&U=5&T=V&W=S&M=-F&E=3&N=5&B=&C=&G=&H=&L=K","J":"I"},"1o":1m});',62,92,'|T||T|domains|T|2202196407|T|var|T|20180625175917|T|if|T|http|T|net|T||T||T||T|com|T|envivo_x|T||T|8088|T|SD|T|cn|T||T|msisdn|T|m3u8|T|index|T|65d39170cf9a2af896fe2aff72d428bb|T|cctvnews|T|url|T|top|T|zA|T|Z0|T|length|T||T|location|T|href|T|hcs|T|live|T|mdspid|T|cmvideo|T|711|T|promotionId|T|mvid|T|spid|T|assertID|T|99|T|mcid|T|mpid|T|hls|T|type|T|cff9c8cd26fa2ed95fd0872a9420d823|T|encrypt|T|ParentNodeID|T|SecurityKey|T|2028597139|T|sid|T|netType|T|pid|T|609017205|T|Channel_ID|T|timestamp|T|1004_10010001005|T|ProgramID|T|699004|T|null|T|try|T|for|T|function|T|else|T|break|T|split|T|66zb|T|66zhibo|T|haoqu|T|126zhibo|T|haoqiu365|T|referrer|T|document|T|match|T|pc|T|catch|T|showPlayer|T|iframed|T|window|T|www|T|from|T|baidu|T|be|T|200|T|throw|T|ret|T|new|T|Error|T|mobile|T|can|T|encodeURIComponent'.split('|'+String.fromCharCode(84)+'|'),0,{}))
expected codes:
(function() {
try {
var domains = "0.1|haoqu.net|66zhibo.net|66zb.net|126zhibo.com|haoqiu365.com",
domains = domains.split("|");
var a = document.referrer;
if (a) {
var b = a.match(/([a-zA-Z0-9\-]+\.[a-zA-Z0-9\-]+)[:\/]/i);
if (b != null) {
for (var i = 0; i < domains.length; i++) {
if (b[1] == domains[i]) {
break
} else if (i == domains.length - 1) {
throw new Error("can't be iframed")
}
}
}
}
} catch (e) {
top.location.href = "http://www.baidu.com/" + "?from=" + encodeURIComponent(top.location.href)
}
})();
window['showPlayer']({
"pc": {
"url": "http:\/\/live.hcs.cmvideo.cn:8088\/envivo_x\/SD\/cctvnews\/711\/index.m3u8?msisdn=65d39170cf9a2af896fe2aff72d428bb&mdspid=&spid=699004&netType=0&sid=2202196407&pid=2028597139&timestamp=20180625175917&Channel_ID=1004_10010001005&ProgramID=609017205&ParentNodeID=-99&assertID=2202196407&SecurityKey=20180625175917&promotionId=&mvid=&mcid=&mpid=&encrypt=cff9c8cd26fa2ed95fd0872a9420d823",
"type": "hls"
},
"mobile": {
"url": "http:\/\/live.hcs.cmvideo.cn:8088\/envivo_x\/SD\/cctvnews\/711\/index.m3u8?msisdn=65d39170cf9a2af896fe2aff72d428bb&mdspid=&spid=699004&netType=0&sid=2202196407&pid=2028597139&timestamp=20180625175917&Channel_ID=1004_10010001005&ProgramID=609017205&ParentNodeID=-99&assertID=2202196407&SecurityKey=20180625175917&promotionId=&mvid=&mcid=&mpid=&encrypt=cff9c8cd26fa2ed95fd0872a9420d823",
"type": "hls"
},
"ret": 200
});

Yeah, I have found the best answer. Use ScriptEngineer! However, javax.script.* is not available in Android, what a pity.
But I searched for this question to get the final answer.
Add implementation 'io.apisense:rhino-android:1.0' to dependencies, and the complete codes are below:
private String unpackJs(String jsPacked) {
ScriptEngineManager engineManager = new ScriptEngineManager();
ScriptEngine engine = engineManager.getEngineByName("rhino");
try {
engine.eval(jsPacked.replace("eval", "var _jsUnPacked = "));
} catch (Exception e) {
e.printStackTrace();
}
Object jsUnPacked = engine.get("_jsUnPacked");
return jsUnPacked.toString();
}
UPDATED:
The second answer, use JavaScript engine from Java codes:
Download rhino release jar from GitHub, put it to libs directory, and add implementation fileTree(dir: 'libs', include: ['*.jar']) to dependencies, and the complete codes are below:
private String unpackJs(String jsPacked) {
org.mozilla.javascript.Context ct = org.mozilla.javascript.Context.enter();
ct.setOptimizationLevel(-1); // https://stackoverflow.com/a/3859485/6482350
Scriptable scope = ct.initStandardObjects();
ct.evaluateString(scope, jsPacked.replace("eval", "var _jsUnPacked = "), null, 1, null);
Object jsUnpacked = scope.get("_jsUnPacked", scope);
return jsUnpacked.toString();
}

Detection of accessing on a mobile device [duplicate]

This question already has answers here:
Detecting a mobile browser
(46 answers)
Closed 8 years ago.
I have a website im developing, and I plan to release a companion app alongside it since it doesnt look nearly as good on mobile as it does on desktop. There are a lot of performance issues as well. Ive noticed that some website notify you to go to a different page if you are using a mobile device, and I want to do something like that, except have a message pop up. Im sure i can handle the message part, but what i need help with is the methodology behind detecting usage of a mobile device. Ive seen this website through a simple google search:
http://detectmobilebrowsers.com/
but i have absolutely NO idea how to implement it with JS.
Thanks for the help in advance!

Try this
/**
* Mobile Detect
* #license http://www.opensource.org/licenses/mit-license.php The MIT License
*/
class Mobile_Detect
{
protected $accept;
protected $userAgent;
protected $isMobile = false;
protected $isAndroid = null;
protected $isAndroidtablet = null;
protected $isIphone = null;
protected $isIpad = null;
protected $isBlackberry = null;
protected $isBlackberrytablet = null;
protected $isOpera = null;
protected $isPalm = null;
protected $isWindows = null;
protected $isWindowsphone = null;
protected $isGeneric = null;
protected $devices = array(
"android" => "android.*mobile",
"androidtablet" => "android(?!.*mobile)",
"blackberry" => "blackberry",
"blackberrytablet" => "rim tablet os",
"iphone" => "(iphone|ipod)",
"ipad" => "(ipad)",
"palm" => "(avantgo|blazer|elaine|hiptop|palm|plucker|xiino)",
"windows" => "windows ce; (iemobile|ppc|smartphone)",
"windowsphone" => "windows phone os",
"generic" => "(kindle|mobile|mmp|midp|pocket|psp|symbian|smartphone|treo|up.browser|up.link|vodafone|wap|opera mini)");
public function __construct()
{
$this->userAgent = $_SERVER['HTTP_USER_AGENT'];
$this->accept = $_SERVER['HTTP_ACCEPT'];
if (isset($_SERVER['HTTP_X_WAP_PROFILE']) || isset($_SERVER['HTTP_PROFILE']))
{
$this->isMobile = true;
}
elseif (strpos($this->accept, 'text/vnd.wap.wml') > 0 || strpos($this->accept, 'application/vnd.wap.xhtml+xml') > 0)
{
$this->isMobile = true;
}
else
{
foreach ($this->devices as $device => $regexp)
{
if ($this->isDevice($device))
{
$this->isMobile = true;
}
}
}
}
/**
* Overloads isAndroid() | isAndroidtablet() | isIphone() | isIpad() | isBlackberry() | isBlackberrytablet() | isPalm() | isWindowsphone() | isWindows() | isGeneric() through isDevice()
*
* #param string $name
* #param array $arguments
* #return bool
*/
public function __call($name, $arguments)
{
$device = substr($name, 2);
if ($name == "is" . ucfirst($device) && array_key_exists(strtolower($device), $this->devices))
{
return $this->isDevice($device);
}
else
{
trigger_error("Method $name not defined", E_USER_WARNING);
}
}
/**
* Returns true if any type of mobile device detected, including special ones
* #return bool
*/
public function isMobile()
{
return $this->isMobile;
}
protected function isDevice($device)
{
$var = "is" . ucfirst($device);
$return = $this->$var === null ? (bool) preg_match("/" . $this->devices[strtolower($device)] . "/i", $this->userAgent) : $this->$var;
if ($device != 'generic' && $return == true) {
$this->isGeneric = false;
}
return $return;
}
}
//call this way
$detect= new Mobile_Detect();
if ($detect->isMobile())
{
$_SESSION['mobile']="mobile";
}

V8: Fatal error: CHECK(V8::ArrayBufferAllocator() != NULL) failed

I get this error when I try to run some JS code (this + this) with V8 (tried master from two weaks ago, 3.23.17, 3.24.40, 3.25.5; 3.23.0 doesn't work anymore because of API changes):
#
# Fatal error in ..\..\src\runtime.cc, line 785
# CHECK(V8::ArrayBufferAllocator() != NULL) failed
#
A lot of other JS code has worked already, so I wonder what the problem is.
It's on Win8 with a x64 build. V8 has been build just as described in the official docs (using gyp + MSVC 2012). I don't think that there was a problem because it worked fine already with most other JS code.
I think that there might be an issue with V8 itself, but not sure...
I also asked on the mailing-list here.
Some C++ code, but I don't think that there is a problem with it because it worked fine with other JS code:
#include <string>
#include <assert.h>
#include <iostream>
#include <sstream>
#include <iomanip>
#include <boost/noncopyable.hpp>
#include <v8.h>
// Create a new isolate (completely isolated JS VM).
struct V8Isolate : boost::noncopyable {
v8::Isolate* isolate;
V8Isolate() : isolate(v8::Isolate::New()) {}
~V8Isolate() { isolate->Dispose(); }
operator v8::Isolate*() { return isolate; }
v8::Isolate* operator->() { return isolate; }
};
struct ReturnType {
std::string err; // non-empty if there is an error
ReturnType(bool success) {
assert(success);
}
ReturnType(const std::string& _err) : err(_err) {
assert(!err.empty());
}
ReturnType(const char* _err) : err(_err) {
assert(!err.empty());
}
operator bool() const { return err.empty(); }
};
#define CHECK_RETURN(cmd) { ReturnType ret = (cmd); if(!ret) return ret; }
using namespace std;
using namespace v8;
ReturnType readFile(const std::string& filename, std::string& res) {
res = "";
FILE* f = fopen(filename.c_str(), "r");
if(!f) return "File '" + filename + "' cannot be opened";
while(!feof(f) && !ferror(f)) {
char buffer[1024 * 8];
size_t s = fread(buffer, 1, sizeof(buffer), f);
if(s > 0)
res.append(buffer, buffer + s);
}
auto err = ferror(f);
fclose(f);
if(err)
return "Error while reading file '" + filename + "'";
return true;
}
ReturnType execJsFile(const std::string& jsSourceDir, const std::string& extfilename) {
v8::TryCatch try_catch;
std::string sourceStr;
CHECK_RETURN(readFile(jsSourceDir + "/" + extfilename, sourceStr));
Local<String> origin = String::NewFromUtf8(Isolate::GetCurrent(), &extfilename[0], String::kNormalString, (int)extfilename.size());
Local<String> source = String::NewFromUtf8(Isolate::GetCurrent(), &sourceStr[0], String::kNormalString, (int)sourceStr.size());
Local<v8::Script> script = Script::Compile(source, origin);
if(script.IsEmpty()) {
assert(try_catch.HasCaught());
return "JS compile failed: " + jsObjToString(try_catch.Exception());
}
// Run the script to setup its environment
Local<Value> result = script->Run();
if(result.IsEmpty()) {
assert(try_catch.HasCaught());
return "JS script execution failed: " + jsReportExceptionToString(Isolate::GetCurrent(), &try_catch);
}
return true;
}
ReturnType loadJsGit() {
V8Isolate isolate;
v8::Isolate::Scope isolateScope(isolate);
HandleScope handleScope(isolate);
Handle<Context> context = Context::New(isolate);
Context::Scope contextScope(context);
auto globalObj = context->Global();
CHECK_RETURN(execJsFile(".", "global.js"));
CHECK_RETURN(execJsFile(".", "jsgit.js"));
return true;
}
int main(int argc, char** argv) {
ReturnType ret = loadJsGit();
if(!ret) cout << "error: " << ret.err << endl;
}

You need to initialize array buffer allocator.
Use malloc, for example:
class MallocArrayBufferAllocator : public v8::ArrayBuffer::Allocator {
public:
virtual void* Allocate(size_t length) { return malloc(length); }
virtual void* AllocateUninitialized(size_t length) { return malloc(length); }
virtual void Free(void* data, size_t length) { free(data); }
};
Initialize:
v8::V8::SetArrayBufferAllocator(new MallocArrayBufferAllocator);