همه روشهایی که گفته شد رو انجام دادم ، اتریبیوت ها هم درست کار میکنن . اما در ویو عکس لود نمیشه

Summary of the issue

I have used this library on arch Linux before and it was working fine. yesterday i switch to Ubuntu 20.04 ( WSL2 windows 2004) and setup new development environment on my main machine everything is working fine except this library.
there is no exception but the output of DNTCaptchaImage/Show?... is a empty transparent Image!
i already installed libgdiplus library on ubuntu.
what possibly can cause this problem ? (look at attached image pls)

Environment

Wsl2 - Ubuntu 20.04

DNTCaptcha.Core version: 2.3.0 and 2.5.0
.NET Core SDK version:  3.1
IDE: vscode

Output:

Exception message: there is no exception

سلام، روزتون بخیر
با هر بار لود شدن صفحه یک کوکی ساخته شده و به هیچ وجه حذف نمیشوند و باعث میشود حجم ریکوئست ها بالا رفته و پس از چندین بار وارد کردن اشتباه کپچا، کاربر دیگر قادر به مشاهده سایت نباشد
(Bad Request - Request Too Long)

`info: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
Executing action method DNTCaptcha.Core.DNTCaptchaImageController.Show (DNTCaptcha.Core) with arguments (CfDJ8AUyVhOCtYhBqsBayGrsMEg6ZEKonj8Yu4zyLjktNB8GB1aWxuLw9zhe3cuRfPfMiOi/F2sTu/8TXeYBrtMG42XJ2TPsiPDrmOU19aetv6kfg+YXpQu7Jy3vFg1RG3I9gY0ugsP2zH5Cb5uu15Zr50A=, 636275045063773290, black, #ccc, 20, Tahoma) - ModelState is Valid
info: Microsoft.AspNetCore.Mvc.StatusCodeResult[1]
Executing HttpStatusCodeResult, setting HTTP status code 400
info: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[2]
Executed action DNTCaptcha.Core.DNTCaptchaImageController.Show (DNTCaptcha.Core) in 0.3593ms
info: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
Executing action method IdentityServerWithIdentityCore.Controllers.ErrorController.Index (IdentityServerWithIdentityCore) with arguments (400) - ModelState is Valid
fail: IdentityServerWithIdentityCore.Controllers.ErrorController[0]
Error 400 for GET /DNTCaptchaImage/Show

I run my project in a docker container, if I bind a domain by nginx then use proxy_pass forward to the container, or add SSL through CDN service, the captcha will return 400 error. Maybe it results from ports or something else?

Summary of the issue

I'm trying to use this library but I'm facing an HTTP 500 error.
the expected behavior is a useful error message.

Environment

Linux

DNTCaptcha.Core version: 2.3.0
.NET Core SDK version: 3.1

Example code/Steps to reproduce:

example request headers:

:method: POST
:path: /DNTCaptchaApi/CreateDNTCaptcha
:scheme: https
accept: application/json, text/plain, /
accept-encoding: gzip, deflate, br
accept-language: en-US,en;q=0.9
cache-control: no-cache
content-length: 210
content-type: application/json;charset=UTF-8
origin: https://localhost:5001
pragma: no-cache
referer: https://localhost:5001/login
sec-fetch-dest: empty
sec-fetch-mode: cors
sec-fetch-site: same-origin

example request payload:

{"backColor":"#f7f3f3","fontName":"Tahoma","fontSize":18,"foreColor":"#111111","language":"English","max":9000,"min":1,"useRelativeUrls":true,"displayMode":"NumberToWord","useNoise":true,"captchaToken":"token"}

I've added library API this way :

services.AddDNTCaptcha(options =>
    options.UseCookieStorageProvider() // -> It relies on the server and client's times. It's ideal for 
    scalability, because it doesn't save anything in the server's memory. );

Output:

Error 500.

Exception message: none

did I miss something?

Summary of the issue

Bad Request - Request Too Long
HTTP Error 400. The size of the request headers is too long.

it has chance to occur,when refresh the captcha

Hi,
I wanna use ValidateDNTCaptcha for a get method but when i do that whatever user enter in captcha input text box DNTCaptchaValidator consider that as true.

Is this part necessary in DNTCaptchaValidatorResult

Is possible this captcha implemented on Angular ?

Hi，
I found that there is only 3 language support.
Is there provide any other way for me to add other language support ?

observable error: HttpErrorResponse

I use DNTCaptcha.Core Version="1.4.1" and call it in Startup.cs like this

 services.AddDNTCaptcha();

In my angular app use dnt-captcha component

When I run project angular show this error in console of browser

observable error:  HttpErrorResponse {headers: HttpHeaders, status: 400, statusText: "Bad Request", url: "http://localhost:5000/DNTCaptchaApi/CreateDNTCaptcha", ok: false, …}

How can I solve this problem?

سلام
امکان تغییر آیدی فراهم نیست
چون از دوتا کپچا دریک صفحه استفاده میشه و تداخل آیدی ایجاد میشه.
لطفا این امکانو اضافه کنید

Hi,

It would be great if the default validator service could return the reason of invalidation.
I want to have a different error message when cookie is not valid. For example telling user that your login form has been expired.
Based on current validator service I don't have any ways to do this except writing my own validator service.
I think it's really essential for a validator service to return the reason if a captcha entry is not valid.

Thanks in advance

Please send better message to show when send wrong numbers:
this line

with this message :
"کد امنیتی وارد شده صحیح نمی باشد.به رقم وارد نمایید"

a suggest

Summary of the issue

سلام
روی دو تا پروژه ی ساده تازه ایجاد شده
net core 2.2 , net 4.8
تست کردم باز همین خطا رو داد

این دلیلش بود که تو باگ ایجاد شده قبلی جزییات نفرستادم

Environment

edge 44 , firefox 69 developer

DNTCaptcha.Core version:  1.9.2
.NET Core SDK version:  net core 2.2  , net framework 4.8
IDE: visual studio  16.2.3

Example code/Steps to reproduce:

paste your core code

Output:

HTTP400: BAD REQUEST - The request could not be processed by the server due to invalid syntax.
GET - https://localhost:44333/DNTCaptchaImage/Show/CfDJ8DB9vg-EjNhHuYHkC4MDpXn9FS2k-ZuzzPnJ3rx9b2LbtrW-LuVgUrzapIYMrdlJNA6n9s5JUjTAQE8RLmfu8fUFpXgzlSMJR7KcCT6l51xuadDw1-m-qBDI2MkcocksgVA1J5IQoCygwBam-7adM0UE2b5hDZ7ogXt7iFlU90zikYz9NPQpXlFz-UV5bPAF6_CMqytNTvtZDvBjv_WVLCrqcKJdUG68I2CcaM8mdvkBEt5OOyFOq4afytCQO5HUs7MNiRX228CBfiOvRmRQvToIJXLqYgMyN91joznk6VMFBA2f_i8rlIV_8NjE2HtUrRn-XkADFrNZ8DyJ_uVW9Skm308-DADunJhR12urEiRzKez_X1UEv7Z_t6MuANTk8AlU8NwOqKnTjh8zr7PDvljpYbgBeC2DkEGIWqOORK7nvzm9NOqfbYdKZLOI15TmCMF7hD2Al_2MfD-bhT9I1R_lTZbAz_OFdO-xTU16IO_jBbOGLTStryslYPNHrptoYg

Exception message:
The request could not be processed by the server due to invalid syntax.

Full Stack trace: نداره!

Hello
I can't define new font for captcha, and always read that from system fonts
asp-font-name="Vazir" not worked actually, although this font existed in styles and appended to my project.
where we can set new font?

سلام جناب نصیری
وقتتون بخیر
توی قسمت لاگ پروژه
asp.net identity core
خطا و هشدار زیر بسیار رخ می دهد.

ممنون میشم راهنمایی بفرمایید دلیل رخ دادن موارد ذکر شده چیست
با تشکر

Summary of the issue

DNTCaptcha.Core in Razor Page NOT WORKING

Register.cshtml.cs

namespace MyProject.Areas.Identity.Pages.Account
{
    public class RegisterModel : PageModel
    {
        public async Task OnGetAsync(string returnUrl = null)
        { . . . }

        [ValidateDNTCaptcha(ErrorMessage = "Please enter the security code as a number.",
            CaptchaGeneratorLanguage = DNTCaptcha.Core.Providers.Language.English,
            CaptchaGeneratorDisplayMode = DNTCaptcha.Core.Providers.DisplayMode.SumOfTwoNumbers)]
        public async Task<IActionResult> OnPostAsync(string returnUrl = null)
        { 
		if (ModelState.IsValid) // => Always valid
		{ ... }
	}
}

Register.cshtml

<div class="col-lg-6 col-sm-12">
	<dnt-captcha asp-captcha-generator-max="90"
				 asp-captcha-generator-min="1"
				 asp-captcha-generator-language="English"
				 asp-captcha-generator-display-mode="SumOfTwoNumbers"
				 asp-use-relative-urls="true"
				 asp-placeholder="Security code as a number"
				 asp-validation-error-message="@_localizerShared["Please enter the security code as a number."]"
				 asp-font-name="Tahoma"
				 asp-font-size="20"
				 asp-fore-color="#333333"
				 asp-back-color="#ccc"
				 asp-text-box-class="text-box form-control"
				 asp-text-box-template="<div class='input-group'><span class='input-group-prepend'><span class='input-group-text'><i class='fas fa-lock'></i></span></span>{0}</div>"
				 asp-validation-message-class="text-danger"
				 asp-refresh-button-class="fas fa-redo btn-sm" class="text-en" />
</div>
. . .
@section Scripts {
    <partial name="_ValidationScriptsPartial" />
    <script src="~/js/jquery.unobtrusive-ajax.min.js"></script>
}

ALWAYS VALID. How to use it in Razor Pages

I`m using DNTCaptcha 1.4.2 and ASP Core 1.1 when i deploy the project on window server which is using docker nano server i face with this exception and captcha image was not showing in project:

System.TypeInitializationException: The type initializer for 'System.Drawing.KnownColors' threw an exception. ---> System.TypeInitializationException: The type initializer for 'System.Drawing.GDIPlus' threw an exception. ---> System.DllNotFoundException: Unable to load DLL 'gdiplus': The specified module could not be found. (Exception from HRESULT: 0x8007007E)at System.Drawing.GDIPlus.GdiplusStartup(UInt64& token, GdiplusStartupInput& input,GdiplusStartupOutput& output)at System.Drawing.GDIPlus..cctor()
--- End of inner exception stack trace ---
at System.Drawing.GDIPlus.RunningOnWindows() at System.Drawing.KnownColors..cctor()
--- End of inner exception stack trace ---
at System.Drawing.KnownColors.FindColorMatch(Color c)
at System.Drawing.ColorConverter.StaticConvertFromString(ITypeDescriptorContext context, String s, CultureInfo culture)at System.Drawing.ColorConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value)at System.Drawing.ColorTranslator.FromHtml(String htmlColor)
at DNTCaptcha.Core.Providers.CaptchaImageProvider.DrawCaptcha(String message, String foreColor, String backColor, Single fontSize, String fontName)
at DNTCaptcha.Core.DNTCaptchaImageController.Show(String text, String rndDate, String foreColor,String backColor, Single fontSize, String fontName)
crit: DNTCaptcha.Core.DNTCaptchaImageController[1001]
DrawCaptcha error.

Summary of the issue

The library doesn't support distributed systems.
It's such a waste that a good library like this doesn't have this feature.

Probable Solution

I had a look at the source code and it seems that adding this feature doesn't need so much effort.
IMemoryCache has been used in two files:
MemoryCacheCaptchaStorageProvider and SerializationProvider
The latter one prevent any storage provider to work on distributed system.
I don't know what other changes is required but at least I know one part of the change required to support the feature is to just replace IMemoryCache with IDistributedCache.

با سلام
برای درخواست های که خروجی جی سان هست مقدار کپچا تغییر نمیکند . وقتی کد کپچا رو اشتباه وارد میکند دوباره کد تغییر نمی کند .با چه روشی کپچا رو رفرش کنیم .ممنون

return Json(new { success = false, state = "loginFail", responseText = messages });
من اونطوری فراخوانی کردم حالا نمیدونم روش کارم درسته یا خیر
$("#dntCaptchaRefreshButton").trigger("click");

Multi-Part Forms

(function ($) {
    $.fn.serializefiles = function () {
        var obj = $(this);
        /* ADD FILE TO PARAM AJAX */
        var token = $(obj).find('input[name= "__RequestVerificationToken"]').val();
        var DNTCaptchaInputText = $(obj).find('input[name= "DNTCaptchaInputText"]').val();
        var DNTCaptchaText = $(obj).find('input[name= "DNTCaptchaText"]').val();
        var DNTCaptchaToken = $(obj).find('input[name= "DNTCaptchaToken"]').val();
        
        var formData = new FormData();
        $.extend(formData, { '__RequestVerificationToken': token });
        $.extend(formData, { 'DNTCaptchaInputText': DNTCaptchaInputText });
        $.extend(formData, { 'DNTCaptchaText': DNTCaptchaText });
        $.extend(formData, { 'DNTCaptchaToken': DNTCaptchaToken });

        $.each($(obj).find("input[type='file']"), function (i, tag) {
            $.each($(tag)[0].files, function (i, file) {
                formData.append(tag.name, file);
            });
        });
        var params = $(obj).serializeArray();
        $.each(params, function (i, val) {
            formData.append(val.name, val.value);
        });
        return formData;
    };
})(jQuery);

use:

$.ajax({
                    type: "POST",
                    url: 'YOUR-URL',         
                    data: ('form[name="YOUR-Form-Name"]').serializefiles(),
                    processData: false,
                    contentType: false,
                    success: function (data, status, xhr) {
                        if (xhr.status == 403) {
                            window.location = '/login'; //در حالت لاگین نبودن شخص اجرا می‌شود
                        }
                        else if (status === 'error' || !data) {
                            alert('error');
                        }
                        else {
                           alert('complate');
                        }
                    }
                });

Summary of the issue

When I click on refresh button url changes but captcha image do not change

Environment

DNTCaptcha.Core version: 
.NET Core SDK version:  3.0 

Summary of the issue

Refresh button explicitly sets model properties from query strings and generates captcha based on it.
It results in a vulnerability that by using Min and Max properties in url of refresh button, we can generate our desired value and it will validate successfully.

Example code/Steps to reproduce:

See this data-ajax-url attribute of refresh button for example:
data-ajax-url="/DNTCaptchaImage/Refresh?rndDate=637025421369768143&FontName=Tahoma&FontSize=12&ForeColor=%231B0172&Language=Persian&Max=999&Min=100&Placeholder=%D8%AD%D8%A7%D8%B5%D9%84%20%D8%AC%D9%85%D8%B9%20%D8%A7%D8%B9%D8%AF%D8%A7%D8%AF%20%D8%A8%D8%A7%D9%84%D8%A7%20%D8%B1%D8%A7%20%D9%88%D8%A7%D8%B1%D8%AF%20%DA%A9%D9%86%DB%8C%D8%AF&TextBoxClass=text-box%20single-line%20mx-auto&TextBoxTemplate=%7B0%7D&ValidationErrorMessage=%D9%84%D8%B7%D9%81%D8%A7%20%DA%A9%D8%AF%20%D8%A7%D9%85%D9%86%DB%8C%D8%AA%DB%8C%20%D8%B1%D8%A7%20%D8%A8%D9%87%20%D8%B1%D9%82%D9%85%20%D9%88%D8%A7%D8%B1%D8%AF%20%D9%86%D9%85%D8%A7%D8%A6%DB%8C%D8%AF&ValidationMessageClass=text-danger&CaptchaToken=.dntCaptcha95e784a1ee6e1f5c8252046ba44a97965b0484985984548&RefreshButtonClass=glyphicon%20glyphicon-refresh%20btn-sm"

we can change it to this (Max=999&Min=999):
data-ajax-url="/DNTCaptchaImage/Refresh?rndDate=637025421369768143&FontName=Tahoma&FontSize=12&ForeColor=%231B0172&Language=Persian&Max=999&Min=999&Placeholder=%D8%AD%D8%A7%D8%B5%D9%84%20%D8%AC%D9%85%D8%B9%20%D8%A7%D8%B9%D8%AF%D8%A7%D8%AF%20%D8%A8%D8%A7%D9%84%D8%A7%20%D8%B1%D8%A7%20%D9%88%D8%A7%D8%B1%D8%AF%20%DA%A9%D9%86%DB%8C%D8%AF&TextBoxClass=text-box%20single-line%20mx-auto&TextBoxTemplate=%7B0%7D&ValidationErrorMessage=%D9%84%D8%B7%D9%81%D8%A7%20%DA%A9%D8%AF%20%D8%A7%D9%85%D9%86%DB%8C%D8%AA%DB%8C%20%D8%B1%D8%A7%20%D8%A8%D9%87%20%D8%B1%D9%82%D9%85%20%D9%88%D8%A7%D8%B1%D8%AF%20%D9%86%D9%85%D8%A7%D8%A6%DB%8C%D8%AF&ValidationMessageClass=text-danger&CaptchaToken=.dntCaptcha95e784a1ee6e1f5c8252046ba44a97965b0484985984548&RefreshButtonClass=glyphicon%20glyphicon-refresh%20btn-sm"

It will give us 999 and when we write 999 in input, it will validate successfully.
A hacker can easily bypass captcha this way.
Refresh controller action must not depend on anything received from client and must generate captcha independently based on sever-side values.

I used DNTIdentityCore and got 2 different error on macOs and Docker.

On macOs(latest Mono Installed already) :

Exception: The type initializer for 'System.Drawing.KnownColors' threw an exception.</h1> at System.Drawing.KnownColors.FromKnownColor(KnownColor kc) at System.Drawing.ColorConverter.StaticConvertFromString(ITypeDescriptorContext context, String s, CultureInfo culture) at System.Drawing.ColorConverter.ConvertFrom(ITypeDescriptorContext context, CultureInfo culture, Object value) at System.Drawing.ColorTranslator.FromHtml(String htmlColor) at DNTCaptcha.Core.Providers.CaptchaImageProvider.DrawCaptcha(String message, String foreColor, String backColor, Single fontSize, String fontName) at DNTCaptcha.Core.DNTCaptchaImageController.Show(String text, String rndDate, String foreColor, String backColor, Single fontSize, String fontName)

And on Docker (USE microsoft/aspnetcore-build:1.1.1) :

`info: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
Executing action method DNTCaptcha.Core.DNTCaptchaImageController.Show (DNTCaptcha.Core) with arguments (CfDJ8AUyVhOCtYhBqsBayGrsMEg6ZEKonj8Yu4zyLjktNB8GB1aWxuLw9zhe3cuRfPfMiOi/F2sTu/8TXeYBrtMG42XJ2TPsiPDrmOU19aetv6kfg+YXpQu7Jy3vFg1RG3I9gY0ugsP2zH5Cb5uu15Zr50A=, 636275045063773290, black, #ccc, 20, Tahoma) - ModelState is Valid
info: Microsoft.AspNetCore.Mvc.StatusCodeResult[1]
Executing HttpStatusCodeResult, setting HTTP status code 400
info: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[2]
Executed action DNTCaptcha.Core.DNTCaptchaImageController.Show (DNTCaptcha.Core) in 0.3593ms
info: Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker[1]
Executing action method IdentityServerWithIdentityCore.Controllers.ErrorController.Index (IdentityServerWithIdentityCore) with arguments (400) - ModelState is Valid
fail: IdentityServerWithIdentityCore.Controllers.ErrorController[0]
Error 400 for GET /DNTCaptchaImage/Show

  Accept: image/png,image/svg+xml,image/*;q=0.8,*/*;q=0.5
  Accept-Encoding: gzip, deflate
  Accept-Language: en-us

Cookie: .AspNetCore.Antiforgery.c0metC3jpAQ=CfDJ8AUyVhOCtYhBqsBayGrsMEgQPLfXuennB5AZ9tcxb05LRvGuolVy-ESXwrTXZXhAoBPp-........`

Summary of the issue

I understand that you have used Request.Scheme to generate the captcha image link, but this might not be effective behind reverse-proxies or load-balancers where the incoming https traffic is transformed into http to reach the application. Since this can result in "mixed content" warnings in modern browsers, I think some handy option like "PublicOrigin", as accomplished by the IdentityServer team, would make everyone happy:)

Environment

DNTCaptcha.Core version: 2.6.0
.NET Core SDK version: 3.1
IDE: VS2019

با سلام
دنبال روشی هستم که با چند بار اشتباه زدن کد کپچا فوق نمایش داده شود.همون اول کد کپچا نمایش داده نشود. کد فوق چند قابلیتی دارد.؟ با تشکر

Is it possible to use this library without adding full MVC (services.AddMvc() in Startup.cs)? for example i want to just use AddControllers()

ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
System.ThrowHelper.ThrowArgumentOutOfRangeException(ExceptionArgument argument, ExceptionResource resource)
System.Collections.Generic.List.get_Item(int index)
Microsoft.AspNetCore.Mvc.Routing.UrlHelper.GetVirtualPathData(string routeName, RouteValueDictionary values)
Microsoft.AspNetCore.Mvc.Routing.UrlHelper.Action(UrlActionContext actionContext)
Microsoft.AspNetCore.Mvc.UrlHelperExtensions.Action(IUrlHelper helper, string action, string controller, object values, string protocol)
DNTCaptcha.Core.DNTCaptchaTagHelper.getCaptchaImageTagBuilder(string encryptedText)
DNTCaptcha.Core.DNTCaptchaTagHelper.Process(TagHelperContext context, TagHelperOutput output)
DNTCaptcha.Core.DNTCaptchaTagHelper.ProcessAsync(TagHelperContext context, TagHelperOutput output)
Microsoft.AspNetCore.Razor.Runtime.TagHelpers.TagHelperRunner.RunAsync(TagHelperExecutionContext executionContext)

AspNetCore.Views_Account_Login.b__45_1() in Login.cshtml

                        <dnt-captcha asp-captcha-generator-max="9000"
                                     asp-captcha-generator-min="1"
                                     asp-captcha-generator-language="Persian"
                                     asp-placeholder="کد امنیتی به رقم (مانند: 1388)"
                                     asp-validation-error-message="لطفا کد امنیتی را به رقم وارد نمائید"
                                     asp-font-name="Tahoma"
                                     asp-font-size="18"
                                     asp-fore-color="#333333"
                                     asp-back-color="#ccc"
                                     asp-text-box-class="k-textbox"
                                     asp-text-box-template="<span class='k-textbox k-space-right w-100 border-danger'>{0}<span class='inputgroup-icon ms-Icon  ms-Icon--Lock'></span></span>"
                                     asp-validation-message-class="text-danger"
                                     asp-refresh-button-class="ms-Icon ms-Icon--Refresh btn-sm" />

Summary of the issue

Each captcha has its specific hidden inputs (2 ones), id, and cookie and maybe other things that I don't know.
These combinations with their original answer make a captcha valid. Unfortunately, each captcha expires just when its expiration time reaches. This will results a situation that captcha will be reusable in all its expiration time (approximately 8 minutes).
Right behavior is that each time a captcha is checked, its token and all stuffs related must expire.

Example code/Steps to reproduce:

Save the cookie in your browser. Write right answer in value attribute of the main input and copy the parent div with all things within it.
During the expiration time, the captcha remains reusable and you can use these combinations (Cookie and HTML node) to validate all your requests.

Is There a way to refresh de button vía javascript.

I'm using DNTCaptcha with ASP.NET Core API application that is behind nginx reverse proxy. It seems DNTCaptcha cannot decrypt the cookie correctly and always returns BadRequest result.
Do you have any idea what can be wrong or give me any lead to check?

this is what I got from logs :
isValidCookie:: 20 + 5��:���

Environment

Windows Server
ASP.NET Core 3.1
Nginx 1.7.10

DNTCaptcha.Core version:  2.5.0
.NET Core SDK version:  3.1.201
IDE: 

everything is perfect but captcha refresh button not working.

I run my project on centos 7 and I've installed all dependencies you referred in README.md, the problem is that captcha image characters displaying on wrong direction.
Also i installed Tahoma and other RTL fonts and it didn't worked.
have you any idea to solve this?

Environment

The in-use version: DNTCaptcha.Core 1.4.4
Operating system: CentOS Linux 7
IDE: Published with Visual Studio 2017 (v15.6.5) on Windows 10

Captcha URL:

http://192.168.228.129:5000/DNTCaptchaImage/Show?text=CfDJ8LWca3Bj7zxDmnTo3VBV6aSizgT3jEfA3aTyeat07C8MaMVgW0Xv7lZCeoV3VHONnTrV8iR8wjQZz04t0dgMVb5E%2Bion2y%2BiAVXzd%2F4sJq%2Fk50Ycex6noL8hxdF6XnJ81IsX7jNRq93UAPc4OOvIb6oAzmm2RKo1dy1R4XjUh3GlLcny19aJ2YrAW6xntViwHg%3D%3D&rndDate=636692528396190703&foreColor=%23333333&backColor=%23ccc&fontSize=20&fontName=Tahoma

Output:

سلام و عرض ادب
مشکلی که من باهاش برخورد کردم اینه که زمانیکه از طریق گوشی اندروید ارقام رو وارد میکنم اگه صفحه کلید در حالت فارسی باشه جواب نمیده(از عدد وارد شده خطا میگیره که با رشته عددی برابر نیست) ولی در حالت انگلیسی مشکلی نداره
با تشکر

how to resend to refresh DNTCaptcha.Core with jquery.ajax?

Hi

i found a problem in refresh button in identity page like Login or Register
do not fire request to refresh captcha image

Summary of the issue

بعد از مدتی که یه صفحه باز بمونه و بخوایم کیچا رو رفرش کنیم خطای 500 میده
اگر صفحه رو رفرش کنیم مشکلش حل میشه

Environment

DNTCaptcha.Core version: 1.9.5
.NET Core SDK version:  2.2, net 4.8
IDE: visual studio 16.2.5

Example code/Steps to reproduce:

paste your core code

Output:

Exception message:
HTTP500: SERVER ERROR - The server encountered an unexpected condition that prevented it from fulfilling the request.
(XHR)POST - https://localhost:44357/dntcaptchaimage/refresh?data=CfDJ8DB9vg-EjNhHuYHkC4MDpXnsMGLJrFpv28wEoOPJ_SLHKP2Uq4AJPgJuVy-laRJ855XyeXeRbmCL1y40xJuzIxjiMIS8S828y51HKbv2QiOmOuR-j7Wl1mUjCFJnoy2trtV-_O6xhBMtY1GQb-JYwAlsZOAyq1hjdV_Fybj6HGFk7sp0YdmM_ryfm2isuWPmRg

Full Stack trace:

System.NullReferenceException: Object reference not set to an instance of an object.
   at DNTCaptcha.Core.DNTCaptchaImageController.invalidateToken(DNTCaptchaTagHelperHtmlAttributes model)
   at DNTCaptcha.Core.DNTCaptchaImageController.Refresh(String data)
   at lambda_method(Closure , Object , Object[] )
   at Microsoft.AspNetCore.Mvc.Internal.ActionMethodExecutor.SyncActionResultExecutor.Execute(IActionResultTypeMapper mapper, ObjectMethodExecutor executor, Object controller, Object[] arguments)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeActionMethodAsync>d__12.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeNextActionFilterAsync>d__10.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Rethrow(ActionExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ControllerActionInvoker.<InvokeInnerFilterAsync>d__13.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.<InvokeNextResourceFilter>d__23.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Rethrow(ResourceExecutedContext context)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.<InvokeFilterPipelineAsync>d__18.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Mvc.Internal.ResourceInvoker.<InvokeAsync>d__16.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Routing.EndpointRoutingMiddleware.<Invoke>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.<Invoke>d__6.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.StaticFiles.StaticFileMiddleware.<Invoke>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.ResponseCaching.ResponseCachingMiddleware.<Invoke>d__9.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Diagnostics.StatusCodePagesMiddleware.<Invoke>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Builder.Extensions.MapWhenMiddleware.<Invoke>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Builder.Extensions.MapWhenMiddleware.<Invoke>d__3.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Localization.RequestLocalizationMiddleware.<Invoke>d__5.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.VisualStudio.Web.BrowserLink.BrowserLinkMiddleware.<ExecuteWithFilter>d__7.MoveNext()
--- End of stack trace from previous location where exception was thrown ---
   at System.Runtime.ExceptionServices.ExceptionDispatchInfo.Throw()
   at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.<Invoke>d__7.MoveNext()

Environment

DNTCaptcha.Core version: 2.0.2
.NET Core SDK version: 2.2.0

If we enable Content-Security-Policy on our website , we will get an error because of DNTCaptcha (it refers to not to put script tag in your page ).

DNTCaptcha puts a script tag in the page .
Is there any way to solve this problem ?

Summary of the issue

Refresh work when I click on the refresh button but after waiting for a few mins the image is still the same, and even I try to enter expected output as per the current image displayed it shows an invalid message.

Environment

DNTCaptcha.Core version: 2.3.0
.NET Core SDK version: 3.0

Summary of the issue

با سلام هنگامی که بر روی تولید عدد قرار میدهیم بیش از 3 حرف را ویرگول قرار میدهد امکان حذف ویرگول وجود دارد؟

ظاهرا مربوط به فرمت متن میباشد

Environment

DNTCaptcha.Core version: 
.NET Core SDK version: 
IDE: 

Example code/Steps to reproduce:

 public string GetText(long number, Language language)
        {
            var text = string.Format(CultureInfo.InvariantCulture, "{0:N0}", number);
            return language == Language.Persian ? text.ToPersianNumbers() : text;
        }

Output:

Exception message:
Full Stack trace: