ultimatepp/examples/SkylarkUpload/Handlers.icpp

#include "SkylarkUpload.h"

int ProgressHandler(int reason, Http &http, int size)
{
	// get the upload unique identifier
	String id = http["uploadid"];
	String currentId = "." + id + ".currentSize";
	String totalId = "." + id + ".totalSize";
	
	// must be reentrant
	INTERLOCKED {
		switch(reason)
		{
			// got headers ?
			case PROGRESS_HEADER:
			{
				http
					.SessionSet(currentId, 0)
					.SessionSet(totalId, size)
				;
				break;
			}
				
			// reading contents ?
			case PROGRESS_CONTENT:
			{
				int oldPercent = http[currentId];
				int total = http[totalId];

				// take care to NOT return 100% up to upload ended really
				int percent = min(99, (int)(100.0 * size / total));

				// avoid unnnedded session storing
				if(oldPercent != percent)
					http.SessionSet(currentId, percent);
				break;
			}
				
			// finished reading contents ?
			case PROGRESS_END:
			{
				// signals end by resetting total size
				http.SessionSet(totalId, 0);
				break;
			}
			
			// default, used by query handler
			default: // PROGRESS_QUERY
			{
				// check if key is there --> upload started
				int total = http[totalId];
				if(!IsNull(total))
				{
					if(total)
						// if upload not ended, return the progress %
						return http[currentId];
					else
					{
						// upload ended, nullify session variables and return 100%
						http
							.SessionSet(currentId, Null)
							.SessionSet(totalId, Null)
						;
						return 100;
					}
				}
				else
					// upload still not started, return 0 progress
					return 0;
			}
		}
	}
	return true;
}

SKYLARK(Home, "home")
{
	// we need a session variable for upload id
	if(http["@__skylark_session_cookie__"].IsNull())
		http.NewSessionId();
	
	// show rootpath in html page
	http("UploadFolder", Upload().GetRootPath());

	http.RenderResult("SkylarkUpload/SkylarkUpload");
}

SKYLARK(Default, "**")
{
	http.Redirect(Home);
}

SKYLARK_PROGRESS(PostUpload, "upload:POST", &ProgressHandler)
{
	String fileName = AppendFileName(Upload().GetRootPath(), (String)http["filename"]);

	Value const &contents = http["filestoupload[]"];
	Value const &filenames = http["filestoupload.filename[]"];
	if(contents.IsNull() || filenames.IsNull())
		return;
	for(int i = 0; i < contents.GetCount(); i++)
		SaveFile(AppendFileName(Upload().GetRootPath(), (String)filenames[i]), contents[i]);
}

SKYLARK(Progress,"progress")
{
	int p = ProgressHandler(PROGRESS_QUERY, http, 0);
	http.Content("text/plain", Format("%d", p));
	http.Response(200, "OK");
}