public override void ProcessRequest(HttpContext context)
{
long attachmentId = context.Request.QueryString.Get<long>("attachmentId", 0);
if (attachmentId <= 0)
{
WebUtility.Return404(context);
return;
}
string tenantTypeId = context.Request.QueryString.Get<string>("tenantTypeId", null);
if (string.IsNullOrEmpty(tenantTypeId))
{
WebUtility.Return404(context);
return;
}
AttachmentService<Attachment> attachmentService = new AttachmentService<Attachment>(tenantTypeId);
Attachment attachment = attachmentService.Get(attachmentId);
if (attachment == null)
{
WebUtility.Return404(context);
return;
}
IUser currentUser = UserContext.CurrentUser;
//判断是否有附件的购买权限或下载权限，有下载权限肯定有购买权限，目前只有未登录或积分不够时才判定为没有权限
if (!DIContainer.Resolve<Authorizer>().Attachment_Buy(attachment))
{
WebUtility.Return403(context);
return;
}
//如果还没有下载权限，则说明积分可以支付附件售价，但是还未购买，则先进行积分交易
if (!DIContainer.Resolve<Authorizer>().Attachment_Download(attachment))
{
//积分交易
PointService pointService = new PointService();
pointService.Trade(currentUser.UserId, attachment.UserId, attachment.Price, string.Format("购买附件{0}", attachment.FriendlyFileName), true);
}
//创建下载记录
AttachmentDownloadService attachmentDownloadService = new AttachmentDownloadService();
attachmentDownloadService.Create(currentUser == null ? 0 : currentUser.UserId, attachment.AttachmentId);
//下载计数
CountService countService = new CountService(TenantTypeIds.Instance().Attachment());
countService.ChangeCount(CountTypes.Instance().DownloadCount(), attachment.AttachmentId, attachment.UserId, 1, false);
bool enableCaching = context.Request.QueryString.GetBool("enableCaching", true);
context.Response.Status = "302 Object Moved";
context.Response.StatusCode = 302;
LinktimelinessSettings linktimelinessSettings = DIContainer.Resolve<ISettingsManager<LinktimelinessSettings>>().Get();
string token = Utility.EncryptTokenForAttachmentDownload(linktimelinessSettings.Highlinktimeliness, attachmentId);
context.Response.Redirect(SiteUrls.Instance().AttachmentTempUrl(attachment.AttachmentId, tenantTypeId, token, enableCaching), true);
context.Response.Flush();
context.Response.End();
}
public static bool BarAttachement_Download(this IUser currentUser, Attachment attachment)
{
if (DIContainer.Resolve<Authorizer>().Attachment_Edit(attachment))
return true;
//处理仅允许注册用户下载
//if (thread.OnlyAllowRegisteredUserDownload && currentUser == null)
// return false;
//处理售价
if (attachment.Price <= 0)
return true;
AttachmentDownloadService attachementDownloadService = new AttachmentDownloadService();
if (currentUser != null && attachementDownloadService.IsDownloaded(currentUser.UserId, attachment.AttachmentId))
return true;
if (currentUser != null && attachment.Price < currentUser.TradePoints)
return true;
return false;
}
/// <summary>
/// 是否拥有下载的权限
/// </summary>
/// <param name="attachment"></param>
/// <returns></returns>
public bool Attachment_Download(Attachment attachment)
{
//处理仅允许注册用户下载
//if (thread.OnlyAllowRegisteredUserDownload && currentUser == null)
// return false;
//处理售价
if (attachment.Price <= 0)
return true;
//if (DIContainer.Resolve<Authorizer>().Attachment_Edit(attachment))
// return true;
IUser currentUser = UserContext.CurrentUser;
if (currentUser == null)
return false;
if (AuthorizationService.IsOwner(currentUser, attachment.UserId))
return true;
AttachmentDownloadService attachementDownloadService = new AttachmentDownloadService();
if (UserContext.CurrentUser != null && attachementDownloadService.IsDownloaded(UserContext.CurrentUser.UserId, attachment.AttachmentId))
return true;
return false;
}