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#include <fcgiapp.h>

#include <QString>
#include <QStringList>
#include <QHash>
#include <QDir>
#include <QFileInfo>
#include <QXmlStreamReader>
#include <QXmlStreamWriter>
#include <QDateTime>
#include <QProcess>
#include <QTemporaryFile>
#include <QUrlQuery>
#include <QPair>

#define PROGRAMVERSION "1.5"
#define BUFSIZE 1000000

// XML special characters:
// < : &lt;
// > : &gt;
// & : &amp;
// " : &quot;
// ' : &apos;
//
// here:replace &
QString escapeXML(QString s) {
	s.replace("&", "&amp;");
	return s;
}

// revert escapeXML();
QString unescapeXML(QString s) {
	s.replace("&amp;", "&");
	return s;
}

// supported httpStatusCode:
// 400 Bad Request
// 403 Forbidden
// 404 Not Found
// 500 Internal Server Error
// message: additional message
QString httpError(int httpStatusCode, QString message) {
	QString description;

	switch(httpStatusCode) {
		case 400:
			description = "Bad Request";
			break;
		case 403:
			description = "Forbidden";
			break;
		case 404:
			description = "Not Found";
			break;
		case 500:
			description = "Internal Server Error";
			break;
		default:
			message = QString("Bad error code: %1, message: %2").arg(httpStatusCode).arg(message);
			httpStatusCode = 500;
			description = "Internal Server Error";
	}
	return QString("Status: %1 %2\r\nContent-Type: text/html\r\n\r\n<html><body><h1>%1 %2</h1><p>%3</p></body></html>\r\n").arg(httpStatusCode).arg(description).arg(message);
}

struct CommandParameters {
	FCGX_Request request; // the request

	QUrlQuery urlQuery; // derived from request
	QHash<QString, QString> paramHash; // derived from urlQuery

	int count; // request count for this instance

	// Webbox parameters, constant and set globally in Web server config
	QString webboxPath;
	QString webboxName;
	bool webboxReadOnly;
};

class Command {
	public:
		// call interface
		void execute(CommandParameters& p) {
			// check if this webbox is writable and enforce this
			if (p.webboxReadOnly && m_isWriteCommand) {
				printHttpError(400, QString("Webbox is Read-Only"), p);
				return;
			}

			// check for correct method GET/POST
			QString requestMethod(FCGX_GetParam("REQUEST_METHOD", p.request.envp));
			if (requestMethod != m_requestMethod) {
				printHttpError(403, QString("Bad request method"), p);
				return;
			}

			// Set parameters from FastCGI request environment
			m_pathInfo = FCGX_GetParam("PATH_INFO", p.request.envp);
			if (m_pathInfo == "") {
				m_pathInfo = "/";
			}
			if (m_pathInfo.contains("..")) {
				printHttpError(403, QString("Bad path: %1"), p);
				return;
			}

			m_path = p.webboxPath + m_pathInfo;

			this->start(p);
		}

		QString getCommandName() {
			return m_commandName;
		}

	protected:
		// helper function for writing http error
		void printHttpError(int httpStatusCode, QString message, CommandParameters& p) {
			FCGX_PutS(httpError(httpStatusCode, message).toUtf8().data(), p.request.out);
		}
		
		// implemented in implementation classes
		virtual void start(CommandParameters& p) = 0;

		// Implementation class constants
		QString m_commandName;
		QString m_requestMethod;
		bool m_isWriteCommand; // if true, command must be prevented if p.webboxReadOnly

		// calculated during start of execute()
		QString m_pathInfo; // path inside webbox, derived from request
		QString m_path; // complete path
};

class GetCommand: public Command {
	public:
		GetCommand() {
			m_requestMethod = "GET";
		}
};

class PostCommand: public Command {
	public:
		PostCommand() {
			m_requestMethod = "POST";
		}

	protected:
		// prepare POST handler implementation: read m_contentLength and m_content
		// needs to be called at beginning of post implementations start()
		// returns true on success
		bool readContent(CommandParameters& p) {
			QString contentLengthString(FCGX_GetParam("CONTENT_LENGTH", p.request.envp));
			bool ok;
			m_contentLength = contentLengthString.toInt(&ok);

			if (!ok) {
				printHttpError(400, QString("Bad content length"), p);
				return false;
			} else {
				m_content.resize(m_contentLength);
				
				int result = FCGX_GetStr(m_content.data(), m_content.size(), p.request.in);
				if (result != m_content.size()) {
					printHttpError(400, QString("Read error (%1/%2)").arg(result).arg(m_content.size()), p);
					return false;
				}
			}
			return true;
		}

		int m_contentLength;
		QByteArray m_content;
};

class DiagCommand: public GetCommand {
	public:
		DiagCommand() {
			m_commandName = "diag";
			m_isWriteCommand = false;
		}

	protected:
		virtual void start(CommandParameters& p) {
			QString serverName(FCGX_GetParam("SERVER_NAME", p.request.envp));
			// provide diag only on "localhost"
			if (serverName != "localhost") {
				printHttpError(403, QString("Command not available"), p);
				return;
			}

			FCGX_PutS("Content-Type: text/html\r\n\r\n", p.request.out);

			FCGX_PutS("<html><head><title>Params</title></head><body>\r\n", p.request.out);

			FCGX_PutS(QString("Request no. %1<br/><br/>\r\n").arg(p.count).toUtf8().data(), p.request.out);

			char** tmp = p.request.envp;

			while (*tmp) {
				FCGX_PutS(QString("%1<br/>\r\n").arg(*tmp).toUtf8().data(), p.request.out);
				tmp++;
			}
				
			FCGX_PutS(QString("<br/>WEBBOX_PATH=%1<br/>\r\n").arg(p.webboxPath).toUtf8().data(), p.request.out);

			FCGX_PutS(QString("<br/>URL Query=%1<br/>\r\n").arg(p.urlQuery.toString()).toUtf8().data(), p.request.out);

			
			FCGX_PutS("</body></html>\r\n", p.request.out);
		}
};

class ListCommand: public GetCommand {
	public:
		ListCommand() {
			m_commandName = "list";
			m_isWriteCommand = false;
		}

	protected:
		virtual void start(CommandParameters& p) {
			FCGX_PutS("Content-Type: text/xml\r\n\r\n", p.request.out);

			QDir dir(m_path);
			QFileInfoList dirEntryList = dir.entryInfoList(QDir::NoDot | QDir::AllEntries, QDir::DirsFirst | QDir::Name | QDir::IgnoreCase);

			QByteArray xmlData;
			QXmlStreamWriter xmlWriter(&xmlData);
			xmlWriter.writeStartDocument();
			xmlWriter.writeStartElement("list");
			foreach(QFileInfo i, dirEntryList) {
				if (m_pathInfo != "/" || i.fileName() != "..") { // skip on ".." in "/"
					xmlWriter.writeStartElement("listentry");
					xmlWriter.writeAttribute("type", i.isDir() ? "dir" : "file");
					xmlWriter.writeCharacters(i.fileName());
					xmlWriter.writeEndElement();
				}
			}
			xmlWriter.writeEndElement(); // list
			xmlWriter.writeEndDocument();
			FCGX_PutS(xmlData.data(), p.request.out);
		}
};

// Retrieve from Server:
//   Title
//   ReadOnly flag
class ServerInfoCommand: public GetCommand {
	public:
		ServerInfoCommand() {
			m_commandName = "server-info";
			m_isWriteCommand = false;
		}

	protected:
		virtual void start(CommandParameters& p) {
			FCGX_PutS("Content-Type: text/xml\r\n\r\n", p.request.out);

			QByteArray xmlData;
			QXmlStreamWriter xmlWriter(&xmlData);
			xmlWriter.writeStartDocument();
			xmlWriter.writeStartElement("serverinfo");

			xmlWriter.writeTextElement("title", p.webboxName);
			
			xmlWriter.writeTextElement("readonly", p.webboxReadOnly ? "1" : "0");

			xmlWriter.writeEndElement(); // serverinfo
			xmlWriter.writeEndDocument();
			FCGX_PutS(xmlData.data(), p.request.out);
		}
};

class VersionCommand: public GetCommand {
	public:
		VersionCommand() {
			m_commandName = "version";
			m_isWriteCommand = false;
		}

	protected:
		virtual void start(CommandParameters& p) {
			FCGX_PutS("Content-Type: text/plain\r\n\r\n", p.request.out);
			FCGX_PutS(QString("webbox %1<br/>(C) 2018 <a href=\"https://www.reichwein.it/\">Reichwein.IT</a>\r\n").arg(PROGRAMVERSION).toUtf8().data(), p.request.out);
		}
};

class NewDirCommand: public PostCommand {
	public:
		NewDirCommand() {
			m_commandName = "newdir";
			m_isWriteCommand = true;
		}

	protected:
		virtual void start(CommandParameters& p) {
			if (!readContent(p))
				return;

			FCGX_PutS("Content-Type: text/plain\r\n\r\n", p.request.out);
			QXmlStreamReader xml(m_content);

			while (!xml.atEnd()) {
				while (xml.readNextStartElement()) {
					if (xml.name() == "dirname") {
						QString dirname = xml.readElementText();
						QDir dir(m_path);
						if (dir.mkdir(dirname)) {
							FCGX_PutS("Successfully created directory", p.request.out);
						} else {
							FCGX_PutS("Error creating directory", p.request.out);
						}
					}
				}
			}
		}
};

class InfoCommand: public PostCommand {
	public:
		InfoCommand() {
			m_commandName = "info";
			m_isWriteCommand = false;
		}

	protected:
		virtual void start(CommandParameters& p) {
			if (!readContent(p))
				return;

			FCGX_PutS("Content-Type: text/plain\r\n\r\n", p.request.out);
			QXmlStreamReader xml(m_content);

			while (!xml.atEnd()) {
				while (xml.readNextStartElement()) {
					if (xml.name() == "files") {
						while (xml.readNextStartElement()) {
							if (xml.name() == "file") {
								QString filename = xml.readElementText();
								QFileInfo fileInfo(m_path + "/" + filename);
								qint64 size = fileInfo.size();
								QString date = fileInfo.lastModified().toString();
								if (fileInfo.isDir()) {
									FCGX_PutS(QString("%1, %2 (folder)<br>")
											.arg(filename)
											.arg(date).toUtf8().data(), p.request.out);
								} else {
									FCGX_PutS(QString("%1, %2 bytes, %3 (file)<br>")
											.arg(filename)
											.arg(size)
											.arg(date).toUtf8().data(), p.request.out);
								}
							}
						}
					}
				}
			}
		}
};

class DownloadZipCommand: public PostCommand {
	public:
		DownloadZipCommand() {
			m_commandName = "download-zip";
		}

	protected:
		virtual void start(CommandParameters& p) {
			if (!readContent(p))
				return;

			QXmlStreamReader xml(m_content);

			QByteArray zipData;
			QStringList argumentList;
			QTemporaryFile tempfile(QDir::tempPath() + "/webboxXXXXXX.zip");
			tempfile.open();
			QFileInfo fileInfo(tempfile);
			QString tempfilePath = fileInfo.absolutePath();
			QString tempfileName = fileInfo.fileName();
			tempfile.close();
			tempfile.remove();

			argumentList << "-r"; // recursive packing
			argumentList << tempfilePath + "/" + tempfileName; // zip filename

			while (!xml.atEnd()) {
				while (xml.readNextStartElement()) {
					if (xml.name() == "files") {
						while (xml.readNextStartElement()) {
							if (xml.name() == "file") {
								QString filename = xml.readElementText();

								argumentList.append(filename); // add parts
							}
						}
					}
				}
			}

			QProcess process;
			process.setWorkingDirectory(m_path);
			process.setProgram("/usr/bin/zip");
			process.setArguments(argumentList);
			process.start();
			process.waitForFinished();

			QString debugText = process.readAll();
			process.setReadChannel(QProcess::StandardError);
			debugText += process.readAll();

			if (process.state() != QProcess::NotRunning ||
			    process.exitCode() != 0 ||
			    process.exitStatus() != QProcess::NormalExit)
			{
				printHttpError(500, QString("Error running process: %1 %2 %3 %4 %5 %6 %7").
					  arg(process.state()).
					  arg(process.exitCode()).
					  arg(process.exitStatus()).
					  arg(tempfilePath).
					  arg(tempfileName).
					  arg(argumentList[0]).
					  arg(debugText), p);
			} else {

				QFile tempfile(tempfilePath + "/" + tempfileName);
				if (!tempfile.open(QIODevice::ReadOnly)) {
					printHttpError(500, QString("Error reading file"), p);
				} else {
					zipData = tempfile.readAll();

					FCGX_PutS(QString("Content-Disposition: attachment; filename=\"%1\"\r\n").arg("webbox-download.zip").toUtf8().data(), p.request.out);
					FCGX_PutS("Content-Type: application/octet-stream\r\n\r\n", p.request.out);
					
					FCGX_PutStr(zipData.data(), zipData.size(), p.request.out);
				}

				tempfile.close();
				tempfile.remove();
			}
		}
};

class DeleteCommand: public PostCommand {
	public:
		DeleteCommand() {
			m_commandName = "delete";
			m_isWriteCommand = true;
		}

	protected:
		virtual void start(CommandParameters& p) {
			if (!readContent(p))
				return;

			QXmlStreamReader xml(m_content);
			
			QString response = "";

			while (!xml.atEnd()) {
				while (xml.readNextStartElement()) {
					if (xml.name() == "files") {
						while (xml.readNextStartElement()) {
							if (xml.name() == "file") {
								QString filename = xml.readElementText();

								QFileInfo fileInfo(m_path + "/" + filename);
								if (fileInfo.isDir()) {
									QDir dir(m_path);
									if (!dir.rmdir(filename)) {
										response += QString("Error on removing directory %1<br/>").arg(filename);
									}
								} else if (fileInfo.isFile()) {
									QFile file(m_path + "/" + filename);
									if (!file.remove()) {
										response += QString("Error on removing file %1<br/>").arg(filename);
									}
								} else {
									response += QString("Error: %1 is neither file nor directory.<br/>").arg(filename);
								}
							}
						}
					}
				}
			}

			if (response == "") {
				response = "OK";
			}
			
			FCGX_PutS("Content-Type: text/plain\r\n\r\n", p.request.out);
			FCGX_PutS(response.toUtf8().data(), p.request.out);
		}
};

class MoveCommand: public PostCommand {
	public:
		MoveCommand() {
			m_commandName = "move";
			m_isWriteCommand = true;
		}

	protected:
		virtual void start(CommandParameters& p) {
			if (!readContent(p))
				return;

			QXmlStreamReader xml(m_content);
			
			QString response = "";
			QString targetDir;

			while (!xml.atEnd()) {
				while (xml.readNextStartElement()) {
					if (xml.name() == "request") {
						while (xml.readNextStartElement()) {
							if (xml.name() == "target") {
								targetDir = xml.readElementText();
							} else if (xml.name() == "file") {
								QString filename = xml.readElementText();

								QFileInfo fileInfo(m_path + "/" + filename);
								if (fileInfo.isDir()) {
									QDir dir(m_path);
									if (!dir.rename(filename, targetDir + "/" + filename)) {
										response += QString("Error moving directory %1<br/>").arg(filename);
									}
								} else if (fileInfo.isFile()) {
									QFile file(m_path + "/" + filename);
									if (!file.rename(m_path + "/" + targetDir + "/" + filename)) {
										response += QString("Error on moving file %1<br/>").arg(filename);
									}
								} else {
									response += QString("Error: %1 is neither file nor directory.<br/>").arg(filename);
								}
							}
						}
					}
				}
			}

			if (response == "") {
				response = "OK";
			}
			
			FCGX_PutS("Content-Type: text/plain\r\n\r\n", p.request.out);
			FCGX_PutS(response.toUtf8().data(), p.request.out);
		}
};

class RenameCommand: public PostCommand {
	public:
		RenameCommand() {
			m_commandName = "rename";
			m_isWriteCommand = true;
		}

	protected:
		virtual void start(CommandParameters& p) {
			if (!readContent(p))
				return;

			QXmlStreamReader xml(m_content);
			
			QString oldname;
			QString newname;

			while (!xml.atEnd()) {
				while (xml.readNextStartElement()) {
					if (xml.name() == "request") {
						while (xml.readNextStartElement()) {
							if (xml.name() == "oldname") {
								oldname = xml.readElementText();
							} else
							if (xml.name() == "newname") {
								newname = xml.readElementText();
							}
						}
					}
				}
			}
			
			QDir dir(m_path);
			QString response;
			if (!dir.rename(oldname, newname)) {
				response = QString("Error renaming %1 to %2<br/>").arg(oldname).arg(newname);
			} else {
				response = "OK";
			}
			
			FCGX_PutS("Content-Type: text/plain\r\n\r\n", p.request.out);
			FCGX_PutS(response.toUtf8().data(), p.request.out);
		}
};

class UploadCommand: public PostCommand {
	public:
		UploadCommand() {
			m_commandName = "upload";
			m_isWriteCommand = true;
		}

	protected:
		virtual void start(CommandParameters& p) {
			if (!readContent(p))
				return;

			FCGX_PutS("Content-Type: text/plain\r\n\r\n", p.request.out);
			QString contentType(FCGX_GetParam("CONTENT_TYPE", p.request.envp));

			QString separator("boundary=");
			if (!contentType.contains(separator)) {
				FCGX_PutS(QString("No boundary defined").toUtf8().data(), p.request.out);
			} else {
				QByteArray boundary = QByteArray("--") + contentType.split(separator)[1].toUtf8();
				int boundaryCount = m_content.count(boundary);
				if (boundaryCount < 2) {
					FCGX_PutS(QString("Bad boundary number found: %1").arg(boundaryCount).toUtf8().data(), p.request.out);
				} else {
					while (true) {
						int start = m_content.indexOf(boundary) + boundary.size();
						int end = m_content.indexOf(QByteArray("\r\n") + boundary, start);

						if (end == -1) { // no further boundary found: all handled.
							break;
						}

						QByteArray filecontent = m_content.mid(start, end - start);
						int nextBoundaryIndex = end;

						// Read filename
						start = filecontent.indexOf("filename=\"");
						if (start == -1) {
							FCGX_PutS(QString("Error reading filename / start").toUtf8().data(), p.request.out);
						} else {
							start += QByteArray("filename=\"").size();

							end = filecontent.indexOf(QByteArray("\""), start);
							if (end == -1) {
								FCGX_PutS(QString("Error reading filename / end").toUtf8().data(), p.request.out);
							} else {
								QString filename = QString::fromUtf8(filecontent.mid(start, end - start));

								if (filename.size() < 1) {
									FCGX_PutS(QString("Bad filename").toUtf8().data(), p.request.out);
								} else {
									// Remove header
									start = filecontent.indexOf(QByteArray("\r\n\r\n"));
									if (start == -1) {
										FCGX_PutS(QString("Error removing upload header").toUtf8().data(), p.request.out);
									} else {

										filecontent = filecontent.mid(start + QString("\r\n\r\n").toUtf8().size());

										QFile file(m_path + "/" + filename);
										if (!file.open(QIODevice::WriteOnly)) {
											FCGX_PutS(QString("Error opening file").toUtf8().data(), p.request.out);
										} else {
											qint64 written = file.write(filecontent);
											if (written != filecontent.size()) {
												FCGX_PutS(QString("Error writing file").toUtf8().data(), p.request.out);
											}
										}
									}
								}
							}
						}
						m_content.remove(0, nextBoundaryIndex);
					}
				}
			}
		}
};

class DownloadCommand: public GetCommand {
	public:
		DownloadCommand() {
			m_commandName = ""; // default command w/o explict "command=" query argument
			m_isWriteCommand = false;
		}

	protected:
		virtual void start(CommandParameters& p) {
			QFile file(m_path);
			if (file.open(QIODevice::ReadOnly)) {
				QFileInfo fileInfo(m_path);
				FCGX_PutS(QString("Content-Disposition: attachment; filename=\"%1\"\r\n").arg(fileInfo.fileName()).toUtf8().data(), p.request.out);
				FCGX_PutS("Content-Type: application/octet-stream\r\n\r\n", p.request.out);
				
				while (!file.atEnd()) {
					QByteArray ba = file.read(BUFSIZE);
					FCGX_PutStr(ba.data(), ba.size(), p.request.out);
				}
			} else {
				FCGX_PutS(httpError(500, QString("Bad file: %1").arg(m_pathInfo)).toUtf8().data(), p.request.out);
			}
		}
};

// Hash of commands for fast access
class Commands: public QHash<QString, Command*> {
	public:
		void registerCommand(Command& command) {
			(*this)[command.getCommandName()] = &command;
		}
};

void initlocale() {
	if (setenv("LC_ALL", "UTF-8", 1)) {
		exit(1);
	}
}

int main(int argc, char* argv[]) {
	initlocale();

	int result = FCGX_Init();
	if (result != 0) {
		return 1; // error on init
	}

	CommandParameters commandParameters;

	FCGX_Request& request = commandParameters.request;

	if (FCGX_InitRequest(&request, 0, 0) != 0) {
		return 1; // error on init
	}

	commandParameters.count = 0;

	// values constant to this instance:
	commandParameters.webboxPath = getenv("WEBBOX_PATH");
	commandParameters.webboxName = getenv("WEBBOX_NAME");
	char* WEBBOX_READONLY = getenv("WEBBOX_READONLY");
	commandParameters.webboxReadOnly = ((WEBBOX_READONLY != NULL) && !strcmp(WEBBOX_READONLY, "On"));

	Commands commands;

	DiagCommand diagCommand;
	commands.registerCommand(diagCommand);

	ListCommand listCommand;
	commands.registerCommand(listCommand);

	ServerInfoCommand serverInfoCommand;
	commands.registerCommand(serverInfoCommand);

	VersionCommand versionCommand;
	commands.registerCommand(versionCommand);

	NewDirCommand newDirCommand;
	commands.registerCommand(newDirCommand);

	InfoCommand infoCommand;
	commands.registerCommand(infoCommand);

	DownloadZipCommand downloadZipCommand;
	commands.registerCommand(downloadZipCommand);
	
	DeleteCommand deleteCommand;
	commands.registerCommand(deleteCommand);
	
	MoveCommand moveCommand;
	commands.registerCommand(moveCommand);
	
	RenameCommand renameCommand;
	commands.registerCommand(renameCommand);
	
	UploadCommand uploadCommand;
	commands.registerCommand(uploadCommand);
	
	DownloadCommand downloadCommand;
	commands.registerCommand(downloadCommand);
	
	while (FCGX_Accept_r(&request) == 0) {

		commandParameters.count++;

		QString queryString(FCGX_GetParam("QUERY_STRING", request.envp));

		// URL parameters
		commandParameters.urlQuery.setQuery(queryString);

		QList<QPair<QString, QString> > items = commandParameters.urlQuery.queryItems();
		commandParameters.paramHash.clear();

		for (int i = 0; i < items.size(); i++) {
			commandParameters.paramHash[items[i].first] = items[i].second;
		}

		QString commandName = commandParameters.paramHash["command"];
		if (commands.contains(commandName)) {
			Command* command = commands[commandName];

			command->execute(commandParameters);
		} else {
			FCGX_PutS(httpError(400, QString("Bad command: %1").arg(commandName)).toUtf8().data(), request.out);
		}
	}

	return 0;
}