hrynco-notification-service/HrynCo.NotificationService.Worker.Services/Push/PushMessageValidator.cs

namespace HrynCo.NotificationService.Worker.Services.Push;

using HrynCo.NotificationService.Contracts.Messages;

public static class PushMessageValidator
{
    public static bool IsValid(SendPushMessage? message)
    {
        if (message?.Data is not { } data || message.CorrelationContext is null) return false;
        return Guid.TryParse(message.CorrelationContext.CorrelationId, out _) &&
            data.RegistrationId != Guid.Empty && data.BindingId != Guid.Empty &&
            data.ServiceName is { Length: > 0 and <= 100 } && data.UserId != Guid.Empty &&
            data.Token is { Length: > 0 and <= 2048 } && data.TokenHash is { Length: 64 } &&
            IsValidContent(data) && data.ExpiresAt <= DateTimeOffset.UtcNow.AddMinutes(15);
    }

    public static bool IsSupportedVersion(int version) => version is 1 or 2;

    public static bool IsValidContent(SendPushMessageData data) => data.Version switch
    {
        1 => data.Title is { Length: > 0 and <= 100 } && data.Body is { Length: > 0 and <= 500 } && data.Route == "/home",
        2 => ValidTemplateData(data),
        _ => false
    };

    private static bool ValidTemplateData(SendPushMessageData data) =>
        data.TemplateKey is { Length: > 0 and <= 100 } &&
        data.LanguageCode is { Length: > 0 and <= 10 } &&
        data.TemplateData?.Bindings is not null && data.TemplateData.Actions is not null &&
        data.TemplateData.Bindings.All(pair => !string.IsNullOrWhiteSpace(pair.Key) && pair.Value is not null) &&
        data.TemplateData.Actions.All(pair => !string.IsNullOrWhiteSpace(pair.Key) && pair.Value is not null &&
            (pair.Value.ObjectId is null || pair.Value.ObjectId is { Length: > 0 and <= 256 }));

}