Blazor reCAPTCHA验证属性IHttpConextAccessor始终为空 [英] Blazor recaptcha validation attribute IHttpContextAccessor is always null
问题描述
我以为我会尝试使用Blazor服务器端,到目前为止,我已经设法克服了大多数令人头疼的问题,并享受到了这一点。
我正在尝试为Google Recaptcha v3编写一个验证器,它需要用户的IP地址。通常,我只会使用以下命令获取IHttpConextAccessor:
var httpContextAccessor = (IHttpContextAccessor)validationContext.GetService(typeof(IHttpContextAccessor));
但现在返回NULL!我还发现,尝试以同样的方式获取IConfiguration失败了,但为此,我只能在Startup.cs中创建一个静态属性。
这是一天工作中的最后一个障碍,这让我感到困惑。
关于如何将该IP地址放入验证器有什么建议吗?
谢谢!
编辑:
我刚发现将HTTPConextAccessor设为空的错误!
((System.RuntimeType)validationContext.ObjectType).DeclaringMethodthrew‘System.InvalidOperationException’类型的异常
这是验证器:
public class GoogleReCaptchaValidationAttribute : ValidationAttribute
{
protected override ValidationResult IsValid(object value, ValidationContext validationContext)
{
Lazy<ValidationResult> errorResult = new Lazy<ValidationResult>(() => new ValidationResult("Google reCAPTCHA validation failed", new String[] { validationContext.MemberName }));
if (value == null || String.IsNullOrWhiteSpace(value.ToString()))
{
return errorResult.Value;
}
var configuration = Startup.Configuration;
string reCaptchResponse = value.ToString();
string reCaptchaSecret = configuration["GoogleReCaptcha:SecretKey"];
IHttpContextAccessor httpContextAccessor = validationContext.GetService(typeof(IHttpContextAccessor)) as IHttpContextAccessor;
var content = new FormUrlEncodedContent(new[]
{
new KeyValuePair<string, string>("secret", reCaptchaSecret),
new KeyValuePair<string, string>("response", reCaptchResponse),
new KeyValuePair<string, string>("remoteip", httpContextAccessor.HttpContext.Connection.RemoteIpAddress.ToString())
});
HttpClient httpClient = new HttpClient();
var httpResponse = httpClient.PostAsync("https://www.google.com/recaptcha/api/siteverify", content).Result;
if (httpResponse.StatusCode != HttpStatusCode.OK)
{
return errorResult.Value;
}
String jsonResponse = httpResponse.Content.ReadAsStringAsync().Result;
dynamic jsonData = JObject.Parse(jsonResponse);
if (jsonData.success != true.ToString().ToLower())
{
return errorResult.Value;
}
return ValidationResult.Success;
}
}
IServiceProvider
对于这个问题,是因为DataAnnotationsValidator 调用AddDataAnnotationsValidation时,没有将推荐答案传递给ValidationContext
。
private static void ValidateModel(EditContext editContext, ValidationMessageStore messages)
{
var validationContext = new ValidationContext(editContext.Model);
var validationResults = new List<ValidationResult>();
Validator.TryValidateObject(editContext.Model, validationContext, validationResults, true);
// Transfer results to the ValidationMessageStore
messages.Clear();
foreach (var validationResult in validationResults)
{
foreach (var memberName in validationResult.MemberNames)
{
messages.Add(editContext.Field(memberName), validationResult.ErrorMessage);
}
}
editContext.NotifyValidationStateChanged();
}
作为解决办法,您可以实现您自己的DataAnnotationsValidator
和AddDataAnnotationsValidation
。
按照以下步骤操作:
自定义
DataAnnotationsValidator
public class DIDataAnnotationsValidator: DataAnnotationsValidator { [CascadingParameter] EditContext DICurrentEditContext { get; set; } [Inject] protected IServiceProvider ServiceProvider { get; set; } protected override void OnInitialized() { if (DICurrentEditContext == null) { throw new InvalidOperationException($"{nameof(DataAnnotationsValidator)} requires a cascading " + $"parameter of type {nameof(EditContext)}. For example, you can use {nameof(DataAnnotationsValidator)} " + $"inside an EditForm."); } DICurrentEditContext.AddDataAnnotationsValidationWithDI(ServiceProvider); } }
自定义
EditContextDataAnnotationsExtensions
public static class EditContextDataAnnotationsExtensions { private static ConcurrentDictionary<(Type ModelType, string FieldName), PropertyInfo> _propertyInfoCache = new ConcurrentDictionary<(Type, string), PropertyInfo>(); public static EditContext AddDataAnnotationsValidationWithDI(this EditContext editContext, IServiceProvider serviceProvider) { if (editContext == null) { throw new ArgumentNullException(nameof(editContext)); } var messages = new ValidationMessageStore(editContext); // Perform object-level validation on request editContext.OnValidationRequested += (sender, eventArgs) => ValidateModel((EditContext)sender, serviceProvider, messages); // Perform per-field validation on each field edit editContext.OnFieldChanged += (sender, eventArgs) => ValidateField(editContext, serviceProvider, messages, eventArgs.FieldIdentifier); return editContext; } private static void ValidateModel(EditContext editContext, IServiceProvider serviceProvider,ValidationMessageStore messages) { var validationContext = new ValidationContext(editContext.Model, serviceProvider, null); var validationResults = new List<ValidationResult>(); Validator.TryValidateObject(editContext.Model, validationContext, validationResults, true); // Transfer results to the ValidationMessageStore messages.Clear(); foreach (var validationResult in validationResults) { foreach (var memberName in validationResult.MemberNames) { messages.Add(editContext.Field(memberName), validationResult.ErrorMessage); } } editContext.NotifyValidationStateChanged(); } private static void ValidateField(EditContext editContext, IServiceProvider serviceProvider, ValidationMessageStore messages, in FieldIdentifier fieldIdentifier) { if (TryGetValidatableProperty(fieldIdentifier, out var propertyInfo)) { var propertyValue = propertyInfo.GetValue(fieldIdentifier.Model); var validationContext = new ValidationContext(fieldIdentifier.Model, serviceProvider, null) { MemberName = propertyInfo.Name }; var results = new List<ValidationResult>(); Validator.TryValidateProperty(propertyValue, validationContext, results); messages.Clear(fieldIdentifier); messages.Add(fieldIdentifier, results.Select(result => result.ErrorMessage)); // We have to notify even if there were no messages before and are still no messages now, // because the "state" that changed might be the completion of some async validation task editContext.NotifyValidationStateChanged(); } } private static bool TryGetValidatableProperty(in FieldIdentifier fieldIdentifier, out PropertyInfo propertyInfo) { var cacheKey = (ModelType: fieldIdentifier.Model.GetType(), fieldIdentifier.FieldName); if (!_propertyInfoCache.TryGetValue(cacheKey, out propertyInfo)) { // DataAnnotations only validates public properties, so that's all we'll look for // If we can't find it, cache 'null' so we don't have to try again next time propertyInfo = cacheKey.ModelType.GetProperty(cacheKey.FieldName); // No need to lock, because it doesn't matter if we write the same value twice _propertyInfoCache[cacheKey] = propertyInfo; } return propertyInfo != null; } }
将
DataAnnotationsValidator
替换为DIDataAnnotationsValidator
<EditForm Model="@starship" OnValidSubmit="@HandleValidSubmit"> @*<DataAnnotationsValidator />*@ <DIDataAnnotationsValidator /> <ValidationSummary /> </EditForm>
IHttpContextAccessor
您需要在Startup.cs
点赞中注册public void ConfigureServices(IServiceCollection services) { services.AddRazorPages(); services.AddServerSideBlazor(); services.AddHttpContextAccessor(); }
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