WebApi + ClientApp, GraphQL, Reflection
This commit is contained in:
Boris Milašinović
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using System.Linq.Expressions;
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using Events.WebAPI.Contract.Command;
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using Events.WebAPI.Contract.DTOs;
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using Events.WebAPI.Contract.Queries.Generic;
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using FluentValidation;
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using FluentValidation.Results;
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using MediatR;
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namespace Events.WebAPI.Contract.Validation;
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public class UniqueIndexValidator<TDto, TPK> where TDto : IHasIdAsPK<TPK>
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where TPK : IEquatable<TPK>
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{
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private readonly IMediator mediator;
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private readonly Expression<Func<TDto, object?>>[] selectors;
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private readonly Func<IReadOnlyList<string>, IReadOnlyList<string>, ValidationMessage>? errorMessageFactory;
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public UniqueIndexValidator(
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IMediator mediator,
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Func<IReadOnlyList<string>, IReadOnlyList<string>, ValidationMessage>? errorMessageFactory = null,
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params Expression<Func<TDto, object?>>[] selectors)
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{
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this.mediator = mediator;
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this.errorMessageFactory = errorMessageFactory;
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this.selectors = selectors;
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}
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public async Task Validate(string value, ValidationContext<AddCommand<TDto, TPK>> context, CancellationToken cancellationToken)
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{
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string columnName = GetColumnName(context);
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var query = new GetCountQuery<TDto>
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{
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Filters = $"{columnName}==*{EscapeFilterValue(value)}"
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};
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int count = await mediator.Send(query, cancellationToken);
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if (count > 0)
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{
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ValidationMessage validationMessage = BuildErrorMessage([columnName], [value]);
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context.AddFailure(new ValidationFailure(columnName, validationMessage.Message) { ErrorCode = validationMessage.Code });
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}
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}
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public async Task Validate(TDto dto, ValidationContext<AddCommand<TDto, TPK>> context, CancellationToken cancellationToken)
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{
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var query = new GetCountQuery<TDto>();
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List<string> columnNames = [];
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List<string> values = [];
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List<string> filters = [];
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foreach (var selector in selectors)
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{
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string columnName = GetColumnName(selector);
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columnNames.Add(columnName);
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object? rawValue = selector.Compile().Invoke(dto);
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string value = FormatValue(rawValue);
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values.Add(value);
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filters.Add(BuildEqualsFilter(columnName, rawValue));
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}
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query.Filters = string.Join(",", filters);
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int count = await mediator.Send(query, cancellationToken);
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if (count > 0)
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{
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ValidationMessage validationMessage = BuildErrorMessage(columnNames, values);
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context.AddFailure(new ValidationFailure(context.PropertyPath, validationMessage.Message) { ErrorCode = validationMessage.Code });
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}
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}
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public async Task ValidateExisting(string value, ValidationContext<UpdateCommand<TDto>> context, CancellationToken cancellationToken)
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{
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string columnName = GetColumnName(context);
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UpdateCommand<TDto> validatingObject = context.InstanceToValidate;
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var query = new GetItemsQuery<TDto>
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{
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Filters = $"{columnName}==*{EscapeFilterValue(value)}",
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Page = 1,
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PageSize = 2
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};
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List<TDto> items = await mediator.Send(query, cancellationToken);
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if (items.Count > 0)
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{
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bool valueBelongsToValidatingItem = items.Any(item => item.Id.Equals(validatingObject.Dto.Id));
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if (!valueBelongsToValidatingItem)
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{
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ValidationMessage validationMessage = BuildErrorMessage([columnName], [value]);
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context.AddFailure(new ValidationFailure(columnName, validationMessage.Message) { ErrorCode = validationMessage.Code });
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}
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}
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}
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public async Task ValidateExisting(TDto dto, ValidationContext<UpdateCommand<TDto>> context, CancellationToken cancellationToken)
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{
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var query = new GetItemsQuery<TDto>();
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List<string> columnNames = [];
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List<string> values = [];
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List<string> filters = [];
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foreach (var selector in selectors)
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{
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string columnName = GetColumnName(selector);
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columnNames.Add(columnName);
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object? rawValue = selector.Compile().Invoke(dto);
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string value = FormatValue(rawValue);
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values.Add(value);
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filters.Add(BuildEqualsFilter(columnName, rawValue));
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}
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query.Filters = string.Join(",", filters);
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query.Page = 1;
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query.PageSize = 2;
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List<TDto> items = await mediator.Send(query, cancellationToken);
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if (items.Count > 0)
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{
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bool valueBelongsToValidatingItem = items.Any(item => item.Id.Equals(dto.Id));
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if (!valueBelongsToValidatingItem)
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{
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ValidationMessage validationMessage = BuildErrorMessage(columnNames, values);
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context.AddFailure(new ValidationFailure(context.PropertyPath, validationMessage.Message) { ErrorCode = validationMessage.Code });
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}
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}
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}
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private ValidationMessage BuildErrorMessage(IReadOnlyList<string> columnNames, IReadOnlyList<string> values)
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{
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if (errorMessageFactory != null)
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return errorMessageFactory(columnNames, values);
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return columnNames.Count == 1
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? new ValidationMessage(ValidationErrorCodes.UniqueConstraintViolation, $"{columnNames[0]} must be unique. Value {values[0]} has been already used!")
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: new ValidationMessage(ValidationErrorCodes.UniqueConstraintViolation, $"n-tuple ({string.Join(", ", columnNames)}) = ({string.Join(", ", values)}) must be unique.");
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}
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private string GetColumnName(Expression<Func<TDto, object?>> expression)
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{
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Expression body = expression.Body;
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if (body is UnaryExpression unaryExpression && unaryExpression.NodeType == ExpressionType.Convert)
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body = unaryExpression.Operand;
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if (body is MemberExpression memberExpression)
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return memberExpression.Member.Name;
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if (body is MethodCallExpression methodCallExpression && methodCallExpression.Object is MemberExpression objectMemberExpression)
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return objectMemberExpression.Member.Name;
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throw new Exception($"Invalid nodetype ({body.NodeType}) in expression");
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}
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private string GetColumnName<T>(ValidationContext<T> context)
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{
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if (selectors.Length != 1)
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throw new Exception($"Unique index contains several columns, and must not be called on a single property {context.PropertyPath}");
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Expression body = selectors[0].Body;
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if (body is UnaryExpression unaryExpression && unaryExpression.NodeType == ExpressionType.Convert)
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body = unaryExpression.Operand;
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if (body is not MemberExpression memberExpression)
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throw new Exception($"Invalid nodetype ({body.NodeType}) in expression");
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string columnName = memberExpression.Member.Name;
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if (columnName != context.PropertyPath.Replace(nameof(UpdateCommand<TDto>.Dto) + ".", ""))
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throw new Exception($"Unique index is defined on {columnName} but called on {context.PropertyPath}");
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return columnName;
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}
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private static string EscapeFilterValue(string value)
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{
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string escaped = value
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.Replace("\\", "\\\\")
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.Replace(",", "\\,")
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.Replace("|", "\\|");
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return string.Equals(escaped, "null", StringComparison.Ordinal)
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? "\\null"
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: escaped;
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}
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private static string BuildEqualsFilter(string columnName, object? value)
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{
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string formattedValue = FormatValue(value);
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return value is string
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? $"{columnName}==*{EscapeFilterValue(formattedValue)}"
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: $"{columnName}=={formattedValue}";
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}
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private static string FormatValue(object? value)
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{
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return value switch
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{
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null => "null",
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string stringValue => stringValue,
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DateOnly dateOnlyValue => dateOnlyValue.ToString("yyyy-MM-dd"),
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DateTime dateTimeValue => dateTimeValue.ToString("O"),
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bool boolValue => boolValue ? "true" : "false",
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IFormattable formattable => formattable.ToString(null, System.Globalization.CultureInfo.InvariantCulture),
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_ => value.ToString() ?? string.Empty
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};
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}
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}
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