private string GetAttachmentUrl(DocumentAttachment attachment, DocumentAttachment mainAttachment, int versionHistoryId)
{
// Get link for attachment
string attachmentUrl;
var attName = mainAttachment.AttachmentName;
var documentId = mainAttachment.AttachmentDocumentID;
var siteName = SiteContext.CurrentSiteName;
if (IsLiveSite && (documentId > 0))
{
attachmentUrl =
ApplicationUrlHelper.ResolveUIUrl(
AttachmentURLProvider.GetAttachmentUrl(
mainAttachment.AttachmentGUID,
URLHelper.GetSafeFileName(attName, siteName)
)
);
}
else
{
attachmentUrl =
ApplicationUrlHelper.ResolveUIUrl(
AttachmentURLProvider.GetAttachmentUrl(
mainAttachment.AttachmentGUID,
URLHelper.GetSafeFileName(attName, siteName),
null,
// Do not include version history ID for temporary attachment
// Version history ID may be present in case of new culture version where may be mix of temporary and version attachments from source
(mainAttachment.AttachmentFormGUID == Guid.Empty) ? versionHistoryId : 0
)
);
}
// Add variant identifier
if (attachment.IsVariant())
{
attachmentUrl = URLHelper.AddParameterToUrl(attachmentUrl, "variant", attachment.AttachmentVariantDefinitionIdentifier);
}
// Ensure correct URL for non-temporary attachments, they need to be served from their original site (may be from linked documents)
if (mainAttachment.AttachmentFormGUID == Guid.Empty)
{
var attachmentSiteName = SiteInfoProvider.GetSiteName(mainAttachment.AttachmentSiteID);
if (attachmentSiteName != siteName)
{
attachmentUrl = URLHelper.AddParameterToUrl(attachmentUrl, "sitename", attachmentSiteName);
}
}
attachmentUrl = URLHelper.UpdateParameterInUrl(attachmentUrl, "chset", Guid.NewGuid().ToString());
// Add latest version requirement for live site
if (IsLiveSite && (documentId > 0))
{
// Add requirement for latest version of files for current document
string newparams = "latestfordocid=" + documentId;
newparams += "&hash=" + ValidationHelper.GetHashString("d" + documentId);
attachmentUrl += "&" + newparams;
}
return(attachmentUrl);
}
