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ktorrent/plugins/rssfeed/rss/loader.cpp

426 lines
8.8 KiB

/*
* loader.cpp
*
* Copyright (c) 2001, 2002, 2003 Frerich Raabe <raabe@kde.org>
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. For licensing and distribution details, check the
* accompanying file 'COPYING'.
*/
#include "loader.h"
#include "document.h"
#include <kio/job.h>
#include <kprocess.h>
#include <kurl.h>
#include <kdebug.h>
#include <tqdom.h>
#include <tqbuffer.h>
#include <tqregexp.h>
#include <tqstringlist.h>
#include <tqtimer.h>
using namespace RSS;
DataRetriever::DataRetriever()
{
}
DataRetriever::~DataRetriever()
{
}
struct FileRetriever::Private
{
Private()
: buffer(NULL),
lastError(0), job(NULL)
{
}
~Private()
{
delete buffer;
}
TQBuffer *buffer;
int lastError;
KIO::Job *job;
};
FileRetriever::FileRetriever()
: d(new Private)
{
}
FileRetriever::~FileRetriever()
{
delete d;
}
bool FileRetriever::m_useCache = true;
void FileRetriever::setUseCache(bool enabled)
{
m_useCache = enabled;
}
void FileRetriever::retrieveData(const KURL &url)
{
if (d->buffer)
return;
d->buffer = new TQBuffer;
d->buffer->open(IO_WriteOnly);
KURL u=url;
if (u.protocol()=="feed")
u.setProtocol("http");
d->job = KIO::get(u, !m_useCache, false);
TQTimer::singleShot(1000*90, this, TQT_SLOT(slotTimeout()));
connect(d->job, TQT_SIGNAL(data(KIO::Job *, const TQByteArray &)),
TQT_SLOT(slotData(KIO::Job *, const TQByteArray &)));
connect(d->job, TQT_SIGNAL(result(KIO::Job *)), TQT_SLOT(slotResult(KIO::Job *)));
connect(d->job, TQT_SIGNAL(permanentRedirection(KIO::Job *, const KURL &, const KURL &)),
TQT_SLOT(slotPermanentRedirection(KIO::Job *, const KURL &, const KURL &)));
}
void FileRetriever::slotTimeout()
{
abort();
delete d->buffer;
d->buffer = NULL;
d->lastError = KIO::ERR_SERVER_TIMEOUT;
emit dataRetrieved(TQByteArray(), false);
}
int FileRetriever::errorCode() const
{
return d->lastError;
}
void FileRetriever::slotData(KIO::Job *, const TQByteArray &data)
{
d->buffer->writeBlock(data.data(), data.size());
}
void FileRetriever::slotResult(KIO::Job *job)
{
TQByteArray data = d->buffer->buffer();
data.detach();
delete d->buffer;
d->buffer = NULL;
d->lastError = job->error();
emit dataRetrieved(data, d->lastError == 0);
}
void FileRetriever::slotPermanentRedirection(KIO::Job *, const KURL &, const KURL &newUrl)
{
emit permanentRedirection(newUrl);
}
void FileRetriever::abort()
{
if (d->job)
{
d->job->kill(true);
d->job = NULL;
}
}
struct OutputRetriever::Private
{
Private() : process(NULL),
buffer(NULL),
lastError(0)
{
}
~Private()
{
delete process;
delete buffer;
}
KShellProcess *process;
TQBuffer *buffer;
int lastError;
};
OutputRetriever::OutputRetriever() :
d(new Private)
{
}
OutputRetriever::~OutputRetriever()
{
delete d;
}
void OutputRetriever::retrieveData(const KURL &url)
{
// Ignore subsequent calls if we didn't finish the previous job yet.
if (d->buffer || d->process)
return;
d->buffer = new TQBuffer;
d->buffer->open(IO_WriteOnly);
d->process = new KShellProcess();
connect(d->process, TQT_SIGNAL(processExited(KProcess *)),
TQT_SLOT(slotExited(KProcess *)));
connect(d->process, TQT_SIGNAL(receivedStdout(KProcess *, char *, int)),
TQT_SLOT(slotOutput(KProcess *, char *, int)));
*d->process << url.path();
d->process->start(KProcess::NotifyOnExit, KProcess::Stdout);
}
int OutputRetriever::errorCode() const
{
return d->lastError;
}
void OutputRetriever::slotOutput(KProcess *, char *data, int length)
{
d->buffer->writeBlock(data, length);
}
void OutputRetriever::slotExited(KProcess *p)
{
if (!p->normalExit())
d->lastError = p->exitStatus();
TQByteArray data = d->buffer->buffer();
data.detach();
delete d->buffer;
d->buffer = NULL;
delete d->process;
d->process = NULL;
emit dataRetrieved(data, p->normalExit() && p->exitStatus() == 0);
}
struct Loader::Private
{
Private() : retriever(NULL),
lastError(0)
{
}
~Private()
{
delete retriever;
}
DataRetriever *retriever;
int lastError;
KURL discoveredFeedURL;
KURL url;
};
Loader *Loader::create()
{
return new Loader;
}
Loader *Loader::create(TQObject *object, const char *slot)
{
Loader *loader = create();
connect(loader, TQT_SIGNAL(loadingComplete(Loader *, Document, Status)),
object, slot);
return loader;
}
Loader::Loader() : d(new Private)
{
}
Loader::~Loader()
{
delete d;
}
void Loader::loadFrom(const KURL &url, DataRetriever *retriever)
{
if (d->retriever != NULL)
return;
d->url=url;
d->retriever = retriever;
connect(d->retriever, TQT_SIGNAL(dataRetrieved(const TQByteArray &, bool)),
this, TQT_SLOT(slotRetrieverDone(const TQByteArray &, bool)));
d->retriever->retrieveData(url);
}
int Loader::errorCode() const
{
return d->lastError;
}
void Loader::abort()
{
if (d && d->retriever)
{
d->retriever->abort();
delete d->retriever;
d->retriever=NULL;
}
emit loadingComplete(this, TQDomDocument(), Aborted);
delete this;
}
const KURL &Loader::discoveredFeedURL() const
{
return d->discoveredFeedURL;
}
#include <kdebug.h>
void Loader::slotRetrieverDone(const TQByteArray &data, bool success)
{
d->lastError = d->retriever->errorCode();
delete d->retriever;
d->retriever = NULL;
Document rssDoc;
Status status = Success;
if (success) {
TQDomDocument doc;
/* Some servers insert whitespace before the <?xml...?> declaration.
* TQDom doesn't tolerate that (and it's right, that's invalid XML),
* so we strip that.
*/
const char *charData = data.data();
int len = data.count();
while (len && TQChar(*charData).isSpace()) {
--len;
++charData;
}
if ( len > 3 && TQChar(*charData) == TQChar(0357) ) { // 0357 0273 0277
len -= 3;
charData += 3;
}
TQByteArray tmpData;
tmpData.setRawData(charData, len);
if (doc.setContent(tmpData))
{
rssDoc = Document(doc);
if (!rssDoc.isValid())
{
discoverFeeds(tmpData);
status = ParseError;
}
}
else
{
discoverFeeds(tmpData);
status = ParseError;
}
tmpData.resetRawData(charData, len);
} else
status = RetrieveError;
emit loadingComplete(this, rssDoc, status);
delete this;
}
void Loader::discoverFeeds(const TQByteArray &data)
{
TQString str = TQString(data).simplifyWhiteSpace();
TQString s2;
//TQTextStream ts( &str, IO_WriteOnly );
//ts << data.data();
// "<[\\s]link[^>]*rel[\\s]=[\\s]\\\"[\\s]alternate[\\s]\\\"[^>]*>"
// "type[\\s]=[\\s]\\\"application/rss+xml\\\""
// "href[\\s]=[\\s]\\\"application/rss+xml\\\""
TQRegExp rx( "(?:REL)[^=]*=[^sAa]*(?:service.feed|ALTERNATE)[\\s]*[^s][^s](?:[^>]*)(?:HREF)[^=]*=[^A-Z0-9-_~,./$]*([^'\">\\s]*)", false);
if (rx.search(str)!=-1)
s2=rx.cap(1);
else{
// does not support Atom/RSS autodiscovery.. try finding feeds by brute force....
int pos=0;
TQStringList feeds;
TQString host=d->url.host();
rx.setPattern("(?:<A )[^H]*(?:HREF)[^=]*=[^A-Z0-9-_~,./]*([^'\">\\s]*)");
while ( pos >= 0 ) {
pos = rx.search( str, pos );
s2=rx.cap(1);
if (s2.endsWith(".rdf")|s2.endsWith(".rss")|s2.endsWith(".xml"))
feeds.append(s2);
if ( pos >= 0 ) {
pos += rx.matchedLength();
}
}
s2=feeds.first();
KURL testURL;
// loop through, prefer feeds on same host
for ( TQStringList::Iterator it = feeds.begin(); it != feeds.end(); ++it ) {
testURL=*it;
if (testURL.host()==host)
{
s2=*it;
break;
}
}
}
if (s2.isNull()) {
kdDebug() << "No feed found for a site" << endl;
return;
}
if (KURL::isRelativeURL(s2))
{
if (s2.startsWith("//"))
{
s2=s2.prepend(d->url.protocol()+":");
d->discoveredFeedURL=s2;
}
else if (s2.startsWith("/"))
{
d->discoveredFeedURL=d->url;
d->discoveredFeedURL.setPath(s2);
}
else
{
d->discoveredFeedURL=d->url;
d->discoveredFeedURL.addPath(s2);
}
d->discoveredFeedURL.cleanPath();
}
else
d->discoveredFeedURL=s2;
d->discoveredFeedURL.cleanPath();
}
#include "loader.moc"
// vim:noet:ts=4