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257 lines
7.2 KiB
257 lines
7.2 KiB
/****************************************************************************
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**
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** Copyright (C) 1992-2008 Trolltech ASA. All rights reserved.
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**
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** This file is part of an example program for TQt. This example
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** program may be used, distributed and modified without limitation.
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**
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*****************************************************************************/
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#include "nntp.h"
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#include <ntqurlinfo.h>
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#include <stdlib.h>
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#include <ntqurloperator.h>
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#include <ntqstringlist.h>
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#include <ntqregexp.h>
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Nntp::Nntp()
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: TQNetworkProtocol(), connectionReady( FALSE ),
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readGroups( FALSE ), readArticle( FALSE )
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{
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// create the command socket and connect to its signals
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commandSocket = new TQSocket( this );
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connect( commandSocket, TQ_SIGNAL( hostFound() ),
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this, TQ_SLOT( hostFound() ) );
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connect( commandSocket, TQ_SIGNAL( connected() ),
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this, TQ_SLOT( connected() ) );
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connect( commandSocket, TQ_SIGNAL( connectionClosed() ),
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this, TQ_SLOT( closed() ) );
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connect( commandSocket, TQ_SIGNAL( readyRead() ),
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this, TQ_SLOT( readyRead() ) );
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connect( commandSocket, TQ_SIGNAL( error( int ) ),
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this, TQ_SLOT( error( int ) ) );
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}
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Nntp::~Nntp()
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{
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close();
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delete commandSocket;
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}
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void Nntp::operationListChildren( TQNetworkOperation * )
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{
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// create a command
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TQString path = url()->path(), cmd;
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if ( path.isEmpty() || path == "/" ) {
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// if the path is empty or we are in the root dir,
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// we want to read the list of available newsgroups
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cmd = "list newsgroups\r\n";
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} else if ( url()->isDir() ) {
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// if the path is a directory (in our case a news group)
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// we want to list the articles of this group
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path = path.replace( "/", "" );
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cmd = "listgroup " + path + "\r\n";
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} else
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return;
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// write the command to the socket
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commandSocket->writeBlock( cmd.latin1(), cmd.length() );
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readGroups = TRUE;
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}
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void Nntp::operationGet( TQNetworkOperation *op )
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{
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// get the dirPath of the URL (this is our news group)
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// and the filename (which is the article we want to read)
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TQUrl u( op->arg( 0 ) );
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TQString dirPath = u.dirPath(), file = u.fileName();
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dirPath = dirPath.replace( "/", "" );
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// go to the group in which the article is
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TQString cmd;
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cmd = "group " + dirPath + "\r\n";
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commandSocket->writeBlock( cmd.latin1(), cmd.length() );
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// read the head of the article
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cmd = "article " + file + "\r\n";
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commandSocket->writeBlock( cmd.latin1(), cmd.length() );
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readArticle = TRUE;
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}
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bool Nntp::checkConnection( TQNetworkOperation * )
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{
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// we are connected, return TRUE
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if ( commandSocket->isOpen() && connectionReady )
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return TRUE;
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// seems that there is no chance to connect
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if ( commandSocket->isOpen() )
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return FALSE;
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// don't call connectToHost() if we are already trying to connect
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if ( commandSocket->state() == TQSocket::Connecting )
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return FALSE;
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// start connecting
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connectionReady = FALSE;
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commandSocket->connectToHost( url()->host(),
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url()->port() != -1 ? url()->port() : 119 );
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return FALSE;
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}
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void Nntp::close()
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{
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// close the command socket
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if ( commandSocket->isOpen() ) {
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commandSocket->writeBlock( "quit\r\n", strlen( "quit\r\n" ) );
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commandSocket->close();
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}
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}
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int Nntp::supportedOperations() const
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{
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// we only support listing children and getting data
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return OpListChildren | OpGet;
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}
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void Nntp::hostFound()
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{
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if ( url() )
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emit connectionStateChanged( ConHostFound, tr( "Host %1 found" ).arg( url()->host() ) );
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else
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emit connectionStateChanged( ConHostFound, tr( "Host found" ) );
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}
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void Nntp::connected()
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{
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if ( url() )
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emit connectionStateChanged( ConConnected, tr( "Connected to host %1" ).arg( url()->host() ) );
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else
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emit connectionStateChanged( ConConnected, tr( "Connected to host" ) );
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}
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void Nntp::closed()
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{
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if ( url() )
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emit connectionStateChanged( ConClosed, tr( "Connection to %1 closed" ).arg( url()->host() ) );
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else
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emit connectionStateChanged( ConClosed, tr( "Connection closed" ) );
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}
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void Nntp::readyRead()
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{
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// new data arrived on the command socket
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// of we should read the list of available groups, let's do so
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if ( readGroups ) {
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parseGroups();
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return;
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}
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// of we should read an article, let's do so
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if ( readArticle ) {
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parseArticle();
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return;
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}
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// read the new data from the socket
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TQCString s;
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s.resize( commandSocket->bytesAvailable() + 1 );
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commandSocket->readBlock( s.data(), commandSocket->bytesAvailable() );
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if ( !url() )
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return;
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// of the code of the server response was 200, we know that the
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// server is ready to get commands from us now
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if ( s.left( 3 ) == "200" )
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connectionReady = TRUE;
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}
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void Nntp::parseGroups()
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{
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if ( !commandSocket->canReadLine() )
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return;
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// read one line after the other
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while ( commandSocket->canReadLine() ) {
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TQString s = commandSocket->readLine();
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// if the line starts with a dot, all groups or articles have been listed,
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// so we finished processing the listChildren() command
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if ( s[ 0 ] == '.' ) {
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readGroups = FALSE;
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operationInProgress()->setState( StDone );
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emit finished( operationInProgress() );
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return;
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}
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// if the code of the server response is 215 or 211
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// the next line will be the first group or article (depending on what we read).
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// So let others know that we start reading now...
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if ( s.left( 3 ) == "215" || s.left( 3 ) == "211" ) {
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operationInProgress()->setState( StInProgress );
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emit start( operationInProgress() );
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continue;
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}
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// parse the line and create a TQUrlInfo object
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// which describes the child (group or article)
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bool tab = s.find( '\t' ) != -1;
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TQString group = s.mid( 0, s.find( tab ? '\t' : ' ' ) );
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TQUrlInfo inf;
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inf.setName( group );
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TQString path = url()->path();
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inf.setDir( path.isEmpty() || path == "/" );
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inf.setSymLink( FALSE );
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inf.setFile( !inf.isDir() );
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inf.setWritable( FALSE );
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inf.setReadable( TRUE );
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// let others know about our new child
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emit newChild( inf, operationInProgress() );
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}
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}
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void Nntp::parseArticle()
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{
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if ( !commandSocket->canReadLine() )
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return;
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// read an article one line after the other
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while ( commandSocket->canReadLine() ) {
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TQString s = commandSocket->readLine();
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// if the line starts with a dot, we finished reading something
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if ( s[ 0 ] == '.' ) {
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readArticle = FALSE;
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operationInProgress()->setState( StDone );
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emit finished( operationInProgress() );
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return;
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}
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if ( s.right( 1 ) == "\n" )
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s.remove( s.length() - 1, 1 );
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// emit the new data of the article which we read
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emit data( TQCString( s.ascii() ), operationInProgress() );
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}
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}
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void Nntp::error( int code )
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{
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if ( code == TQSocket::ErrHostNotFound ||
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code == TQSocket::ErrConnectionRefused ) {
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// this signal is called if connecting to the server failed
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if ( operationInProgress() ) {
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TQString msg = tr( "Host not found or couldn't connect to: \n" + url()->host() );
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operationInProgress()->setState( StFailed );
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operationInProgress()->setProtocolDetail( msg );
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operationInProgress()->setErrorCode( (int)ErrHostNotFound );
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clearOperationQueue();
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emit finished( operationInProgress() );
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}
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}
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}
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