fengling-member-service/src/Fengling.Member.Application/Commands/Member/BindOAuthCommand.cs

using MediatR;
using FluentValidation;
using Fengling.Member.Domain.Aggregates.Users;
using Fengling.Member.Infrastructure.Repositories;

namespace Fengling.Member.Application.Commands.Member;

public record BindOAuthCommand(OAuthProvider Provider, MemberId MemberId, string OpenId, string? UnionId)
    : IRequest<BindOAuthResponse>;

public record BindOAuthResponse(MemberId MemberId, OAuthProvider Provider, string OpenId, string? UnionId, DateTime BoundAt);

public class BindOAuthCommandValidator : AbstractValidator<BindOAuthCommand>
{
    public BindOAuthCommandValidator()
    {
        RuleFor(x => x.Provider).IsInEnum();
        RuleFor(x => x.OpenId).NotEmpty().MaximumLength(128);
        RuleFor(x => x.UnionId).MaximumLength(128);
    }
}

public class BindOAuthCommandHandler(IMemberRepository memberRepository, ILogger<BindOAuthCommandHandler> logger)
    : IRequestHandler<BindOAuthCommand, BindOAuthResponse>
{
    public async Task<BindOAuthResponse> Handle(BindOAuthCommand request, CancellationToken cancellationToken)
    {
        logger.LogInformation("Binding {Provider} for member {MemberId}",
            request.Provider.GetProviderName(), request.MemberId);

        var member = await memberRepository.GetAsync(request.MemberId, cancellationToken)
            ?? throw new KeyNotFoundException($"会员不存在: {request.MemberId}");

        member.BindOAuth(request.Provider, request.OpenId, request.UnionId);

        logger.LogInformation("{Provider} bound successfully for member {MemberId}",
            request.Provider.GetProviderName(), request.MemberId);

        return new BindOAuthResponse(member.Id, request.Provider, request.OpenId, request.UnionId, DateTime.UtcNow);
    }
}