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qt3/src/network/qhttp.cpp

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64 KiB

/****************************************************************************
**
** Implementation of QHttp and related classes.
**
** Created : 970521
**
** Copyright (C) 1997-2008 Trolltech ASA. All rights reserved.
**
** This file is part of the network module of the Qt GUI Toolkit.
**
** This file may be used under the terms of the GNU General
** Public License versions 2.0 or 3.0 as published by the Free
** Software Foundation and appearing in the files LICENSE.GPL2
** and LICENSE.GPL3 included in the packaging of this file.
** Alternatively you may (at your option) use any later version
** of the GNU General Public License if such license has been
** publicly approved by Trolltech ASA (or its successors, if any)
** and the KDE Free Qt Foundation.
**
** Please review the following information to ensure GNU General
** Public Licensing requirements will be met:
** http://trolltech.com/products/qt/licenses/licensing/opensource/.
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
** or contact the sales department at sales@trolltech.com.
**
** This file may be used under the terms of the Q Public License as
** defined by Trolltech ASA and appearing in the file LICENSE.QPL
** included in the packaging of this file. Licensees holding valid Qt
** Commercial licenses may use this file in accordance with the Qt
** Commercial License Agreement provided with the Software.
**
** This file is provided "AS IS" with NO WARRANTY OF ANY KIND,
** INCLUDING THE WARRANTIES OF DESIGN, MERCHANTABILITY AND FITNESS FOR
** A PARTICULAR PURPOSE. Trolltech reserves all rights not granted
** herein.
**
**********************************************************************/
#include "qhttp.h"
#ifndef QT_NO_NETWORKPROTOCOL_HTTP
#include "qsocket.h"
#include "qtextstream.h"
#include "qmap.h"
#include "qstring.h"
#include "qstringlist.h"
#include "qcstring.h"
#include "qbuffer.h"
#include "qurloperator.h"
#include "qtimer.h"
#include "private/qinternal_p.h"
//#define QHTTP_DEBUG
class QHttpPrivate
{
public:
QHttpPrivate() :
state( QHttp::Unconnected ),
error( QHttp::NoError ),
hostname( QString::null ),
port( 0 ),
toDevice( 0 ),
postDevice( 0 ),
bytesDone( 0 ),
chunkedSize( -1 ),
idleTimer( 0 )
{
pending.setAutoDelete( TRUE );
}
QSocket socket;
QPtrList<QHttpRequest> pending;
QHttp::State state;
QHttp::Error error;
QString errorString;
QString hostname;
Q_UINT16 port;
QByteArray buffer;
QIODevice* toDevice;
QIODevice* postDevice;
uint bytesDone;
uint bytesTotal;
Q_LONG chunkedSize;
QHttpRequestHeader header;
bool readHeader;
QString headerStr;
QHttpResponseHeader response;
int idleTimer;
QMembuf rba;
};
class QHttpRequest
{
public:
QHttpRequest()
{
id = ++idCounter;
}
virtual ~QHttpRequest()
{ }
virtual void start( QHttp * ) = 0;
virtual bool hasRequestHeader();
virtual QHttpRequestHeader requestHeader();
virtual QIODevice* sourceDevice() = 0;
virtual QIODevice* destinationDevice() = 0;
int id;
private:
static int idCounter;
};
int QHttpRequest::idCounter = 0;
bool QHttpRequest::hasRequestHeader()
{
return FALSE;
}
QHttpRequestHeader QHttpRequest::requestHeader()
{
return QHttpRequestHeader();
}
/****************************************************
*
* QHttpNormalRequest
*
****************************************************/
class QHttpNormalRequest : public QHttpRequest
{
public:
QHttpNormalRequest( const QHttpRequestHeader &h, QIODevice *d, QIODevice *t ) :
header(h), to(t)
{
is_ba = FALSE;
data.dev = d;
}
QHttpNormalRequest( const QHttpRequestHeader &h, QByteArray *d, QIODevice *t ) :
header(h), to(t)
{
is_ba = TRUE;
data.ba = d;
}
~QHttpNormalRequest()
{
if ( is_ba )
delete data.ba;
}
void start( QHttp * );
bool hasRequestHeader();
QHttpRequestHeader requestHeader();
QIODevice* sourceDevice();
QIODevice* destinationDevice();
protected:
QHttpRequestHeader header;
private:
union {
QByteArray *ba;
QIODevice *dev;
} data;
bool is_ba;
QIODevice *to;
};
void QHttpNormalRequest::start( QHttp *http )
{
http->d->header = header;
if ( is_ba ) {
http->d->buffer = *data.ba;
if ( http->d->buffer.size() > 0 )
http->d->header.setContentLength( http->d->buffer.size() );
http->d->postDevice = 0;
} else {
http->d->buffer = QByteArray();
if ( data.dev && ( data.dev->isOpen() || data.dev->open(IO_ReadOnly) ) ) {
http->d->postDevice = data.dev;
if ( http->d->postDevice->size() > 0 )
http->d->header.setContentLength( http->d->postDevice->size() );
} else {
http->d->postDevice = 0;
}
}
if ( to && ( to->isOpen() || to->open(IO_WriteOnly) ) )
http->d->toDevice = to;
else
http->d->toDevice = 0;
http->sendRequest();
}
bool QHttpNormalRequest::hasRequestHeader()
{
return TRUE;
}
QHttpRequestHeader QHttpNormalRequest::requestHeader()
{
return header;
}
QIODevice* QHttpNormalRequest::sourceDevice()
{
if ( is_ba )
return 0;
return data.dev;
}
QIODevice* QHttpNormalRequest::destinationDevice()
{
return to;
}
/****************************************************
*
* QHttpPGHRequest
* (like a QHttpNormalRequest, but for the convenience
* functions put(), get() and head() -- i.e. set the
* host header field correctly before sending the
* request)
*
****************************************************/
class QHttpPGHRequest : public QHttpNormalRequest
{
public:
QHttpPGHRequest( const QHttpRequestHeader &h, QIODevice *d, QIODevice *t ) :
QHttpNormalRequest( h, d, t )
{ }
QHttpPGHRequest( const QHttpRequestHeader &h, QByteArray *d, QIODevice *t ) :
QHttpNormalRequest( h, d, t )
{ }
~QHttpPGHRequest()
{ }
void start( QHttp * );
};
void QHttpPGHRequest::start( QHttp *http )
{
header.setValue( "Host", http->d->hostname );
QHttpNormalRequest::start( http );
}
/****************************************************
*
* QHttpSetHostRequest
*
****************************************************/
class QHttpSetHostRequest : public QHttpRequest
{
public:
QHttpSetHostRequest( const QString &h, Q_UINT16 p ) :
hostname(h), port(p)
{ }
void start( QHttp * );
QIODevice* sourceDevice()
{ return 0; }
QIODevice* destinationDevice()
{ return 0; }
private:
QString hostname;
Q_UINT16 port;
};
void QHttpSetHostRequest::start( QHttp *http )
{
http->d->hostname = hostname;
http->d->port = port;
http->finishedWithSuccess();
}
/****************************************************
*
* QHttpCloseRequest
*
****************************************************/
class QHttpCloseRequest : public QHttpRequest
{
public:
QHttpCloseRequest()
{ }
void start( QHttp * );
QIODevice* sourceDevice()
{ return 0; }
QIODevice* destinationDevice()
{ return 0; }
};
void QHttpCloseRequest::start( QHttp *http )
{
http->close();
}
/****************************************************
*
* QHttpHeader
*
****************************************************/
/*!
\class QHttpHeader qhttp.h
\brief The QHttpHeader class contains header information for HTTP.
\if defined(commercial)
It is part of the <a href="commercialeditions.html">Qt Enterprise Edition</a>.
\endif
\ingroup io
\module network
In most cases you should use the more specialized derivatives of
this class, QHttpResponseHeader and QHttpRequestHeader, rather
than directly using QHttpHeader.
QHttpHeader provides the HTTP header fields. A HTTP header field
consists of a name followed by a colon, a single space, and the
field value. (See RFC 1945.) Field names are case-insensitive. A
typical header field looks like this:
\code
content-type: text/html
\endcode
In the API the header field name is called the "key" and the
content is called the "value". You can get and set a header
field's value by using its key with value() and setValue(), e.g.
\code
header.setValue( "content-type", "text/html" );
QString contentType = header.value( "content-type" );
\endcode
Some fields are so common that getters and setters are provided
for them as a convenient alternative to using \l value() and
\l setValue(), e.g. contentLength() and contentType(),
setContentLength() and setContentType().
Each header key has a \e single value associated with it. If you
set the value for a key which already exists the previous value
will be discarded.
\sa QHttpRequestHeader QHttpResponseHeader
*/
/*!
\fn int QHttpHeader::majorVersion() const
Returns the major protocol-version of the HTTP header.
*/
/*!
\fn int QHttpHeader::minorVersion() const
Returns the minor protocol-version of the HTTP header.
*/
/*!
Constructs an empty HTTP header.
*/
QHttpHeader::QHttpHeader()
: valid( TRUE )
{
}
/*!
Constructs a copy of \a header.
*/
QHttpHeader::QHttpHeader( const QHttpHeader& header )
: valid( header.valid )
{
values = header.values;
}
/*!
Constructs a HTTP header for \a str.
This constructor parses the string \a str for header fields and
adds this information. The \a str should consist of one or more
"\r\n" delimited lines; each of these lines should have the format
key, colon, space, value.
*/
QHttpHeader::QHttpHeader( const QString& str )
: valid( TRUE )
{
parse( str );
}
/*!
Destructor.
*/
QHttpHeader::~QHttpHeader()
{
}
/*!
Assigns \a h and returns a reference to this http header.
*/
QHttpHeader& QHttpHeader::operator=( const QHttpHeader& h )
{
values = h.values;
valid = h.valid;
return *this;
}
/*!
Returns TRUE if the HTTP header is valid; otherwise returns FALSE.
A QHttpHeader is invalid if it was created by parsing a malformed string.
*/
bool QHttpHeader::isValid() const
{
return valid;
}
/*! \internal
Parses the HTTP header string \a str for header fields and adds
the keys/values it finds. If the string is not parsed successfully
the QHttpHeader becomes \link isValid() invalid\endlink.
Returns TRUE if \a str was successfully parsed; otherwise returns FALSE.
\sa toString()
*/
bool QHttpHeader::parse( const QString& str )
{
QStringList lst;
int pos = str.find( '\n' );
if ( pos > 0 && str.at( pos - 1 ) == '\r' )
lst = QStringList::split( "\r\n", str.stripWhiteSpace(), FALSE );
else
lst = QStringList::split( "\n", str.stripWhiteSpace(), FALSE );
if ( lst.isEmpty() )
return TRUE;
QStringList lines;
QStringList::Iterator it = lst.begin();
for( ; it != lst.end(); ++it ) {
if ( !(*it).isEmpty() ) {
if ( (*it)[0].isSpace() ) {
if ( !lines.isEmpty() ) {
lines.last() += " ";
lines.last() += (*it).stripWhiteSpace();
}
} else {
lines.append( (*it) );
}
}
}
int number = 0;
it = lines.begin();
for( ; it != lines.end(); ++it ) {
if ( !parseLine( *it, number++ ) ) {
valid = FALSE;
return FALSE;
}
}
return TRUE;
}
/*! \internal
*/
void QHttpHeader::setValid( bool v )
{
valid = v;
}
/*!
Returns the value for the entry with the given \a key. If no entry
has this \a key, an empty string is returned.
\sa setValue() removeValue() hasKey() keys()
*/
QString QHttpHeader::value( const QString& key ) const
{
return values[ key.lower() ];
}
/*!
Returns a list of the keys in the HTTP header.
\sa hasKey()
*/
QStringList QHttpHeader::keys() const
{
return values.keys();
}
/*!
Returns TRUE if the HTTP header has an entry with the given \a
key; otherwise returns FALSE.
\sa value() setValue() keys()
*/
bool QHttpHeader::hasKey( const QString& key ) const
{
return values.contains( key.lower() );
}
/*!
Sets the value of the entry with the \a key to \a value.
If no entry with \a key exists, a new entry with the given \a key
and \a value is created. If an entry with the \a key already
exists, its value is discarded and replaced with the given \a
value.
\sa value() hasKey() removeValue()
*/
void QHttpHeader::setValue( const QString& key, const QString& value )
{
values[ key.lower() ] = value;
}
/*!
Removes the entry with the key \a key from the HTTP header.
\sa value() setValue()
*/
void QHttpHeader::removeValue( const QString& key )
{
values.remove( key.lower() );
}
/*! \internal
Parses the single HTTP header line \a line which has the format
key, colon, space, value, and adds key/value to the headers. The
linenumber is \a number. Returns TRUE if the line was successfully
parsed and the key/value added; otherwise returns FALSE.
\sa parse()
*/
bool QHttpHeader::parseLine( const QString& line, int )
{
int i = line.find( ":" );
if ( i == -1 )
return FALSE;
values.insert( line.left( i ).stripWhiteSpace().lower(), line.mid( i + 1 ).stripWhiteSpace() );
return TRUE;
}
/*!
Returns a string representation of the HTTP header.
The string is suitable for use by the constructor that takes a
QString. It consists of lines with the format: key, colon, space,
value, "\r\n".
*/
QString QHttpHeader::toString() const
{
if ( !isValid() )
return "";
QString ret = "";
QMap<QString,QString>::ConstIterator it = values.begin();
for( ; it != values.end(); ++it )
ret += it.key() + ": " + it.data() + "\r\n";
return ret;
}
/*!
Returns TRUE if the header has an entry for the special HTTP
header field \c content-length; otherwise returns FALSE.
\sa contentLength() setContentLength()
*/
bool QHttpHeader::hasContentLength() const
{
return hasKey( "content-length" );
}
/*!
Returns the value of the special HTTP header field \c
content-length.
\sa setContentLength() hasContentLength()
*/
uint QHttpHeader::contentLength() const
{
return values[ "content-length" ].toUInt();
}
/*!
Sets the value of the special HTTP header field \c content-length
to \a len.
\sa contentLength() hasContentLength()
*/
void QHttpHeader::setContentLength( int len )
{
values[ "content-length" ] = QString::number( len );
}
/*!
Returns TRUE if the header has an entry for the the special HTTP
header field \c content-type; otherwise returns FALSE.
\sa contentType() setContentType()
*/
bool QHttpHeader::hasContentType() const
{
return hasKey( "content-type" );
}
/*!
Returns the value of the special HTTP header field \c content-type.
\sa setContentType() hasContentType()
*/
QString QHttpHeader::contentType() const
{
QString type = values[ "content-type" ];
if ( type.isEmpty() )
return QString::null;
int pos = type.find( ";" );
if ( pos == -1 )
return type;
return type.left( pos ).stripWhiteSpace();
}
/*!
Sets the value of the special HTTP header field \c content-type to
\a type.
\sa contentType() hasContentType()
*/
void QHttpHeader::setContentType( const QString& type )
{
values[ "content-type" ] = type;
}
/****************************************************
*
* QHttpResponseHeader
*
****************************************************/
/*!
\class QHttpResponseHeader qhttp.h
\brief The QHttpResponseHeader class contains response header information for HTTP.
\if defined(commercial)
It is part of the <a href="commercialeditions.html">Qt Enterprise Edition</a>.
\endif
\ingroup io
\module network
This class is used by the QHttp class to report the header
information that the client received from the server.
HTTP responses have a status code that indicates the status of the
response. This code is a 3-digit integer result code (for details
see to RFC 1945). In addition to the status code, you can also
specify a human-readable text that describes the reason for the
code ("reason phrase"). This class allows you to get the status
code and the reason phrase.
\sa QHttpRequestHeader QHttp
*/
/*!
Constructs an empty HTTP response header.
*/
QHttpResponseHeader::QHttpResponseHeader()
{
setValid( FALSE );
}
/*!
Constructs a HTTP response header with the status code \a code,
the reason phrase \a text and the protocol-version \a majorVer and
\a minorVer.
*/
QHttpResponseHeader::QHttpResponseHeader( int code, const QString& text, int majorVer, int minorVer )
: QHttpHeader(), statCode( code ), reasonPhr( text ), majVer( majorVer ), minVer( minorVer )
{
}
/*!
Constructs a copy of \a header.
*/
QHttpResponseHeader::QHttpResponseHeader( const QHttpResponseHeader& header )
: QHttpHeader( header ), statCode( header.statCode ), reasonPhr( header.reasonPhr ), majVer( header.majVer ), minVer( header.minVer )
{
}
/*!
Constructs a HTTP response header from the string \a str. The
string is parsed and the information is set. The \a str should
consist of one or more "\r\n" delimited lines; the first line should be the
status-line (format: HTTP-version, space, status-code, space,
reason-phrase); each of remaining lines should have the format key, colon,
space, value.
*/
QHttpResponseHeader::QHttpResponseHeader( const QString& str )
: QHttpHeader()
{
parse( str );
}
/*!
Sets the status code to \a code, the reason phrase to \a text and
the protocol-version to \a majorVer and \a minorVer.
\sa statusCode() reasonPhrase() majorVersion() minorVersion()
*/
void QHttpResponseHeader::setStatusLine( int code, const QString& text, int majorVer, int minorVer )
{
setValid( TRUE );
statCode = code;
reasonPhr = text;
majVer = majorVer;
minVer = minorVer;
}
/*!
Returns the status code of the HTTP response header.
\sa reasonPhrase() majorVersion() minorVersion()
*/
int QHttpResponseHeader::statusCode() const
{
return statCode;
}
/*!
Returns the reason phrase of the HTTP response header.
\sa statusCode() majorVersion() minorVersion()
*/
QString QHttpResponseHeader::reasonPhrase() const
{
return reasonPhr;
}
/*!
Returns the major protocol-version of the HTTP response header.
\sa minorVersion() statusCode() reasonPhrase()
*/
int QHttpResponseHeader::majorVersion() const
{
return majVer;
}
/*!
Returns the minor protocol-version of the HTTP response header.
\sa majorVersion() statusCode() reasonPhrase()
*/
int QHttpResponseHeader::minorVersion() const
{
return minVer;
}
/*! \reimp
*/
bool QHttpResponseHeader::parseLine( const QString& line, int number )
{
if ( number != 0 )
return QHttpHeader::parseLine( line, number );
QString l = line.simplifyWhiteSpace();
if ( l.length() < 10 )
return FALSE;
if ( l.left( 5 ) == "HTTP/" && l[5].isDigit() && l[6] == '.' &&
l[7].isDigit() && l[8] == ' ' && l[9].isDigit() ) {
majVer = l[5].latin1() - '0';
minVer = l[7].latin1() - '0';
int pos = l.find( ' ', 9 );
if ( pos != -1 ) {
reasonPhr = l.mid( pos + 1 );
statCode = l.mid( 9, pos - 9 ).toInt();
} else {
statCode = l.mid( 9 ).toInt();
reasonPhr = QString::null;
}
} else {
return FALSE;
}
return TRUE;
}
/*! \reimp
*/
QString QHttpResponseHeader::toString() const
{
QString ret( "HTTP/%1.%2 %3 %4\r\n%5\r\n" );
return ret.arg( majVer ).arg ( minVer ).arg( statCode ).arg( reasonPhr ).arg( QHttpHeader::toString() );
}
/****************************************************
*
* QHttpRequestHeader
*
****************************************************/
/*!
\class QHttpRequestHeader qhttp.h
\brief The QHttpRequestHeader class contains request header information for
\if defined(commercial)
It is part of the <a href="commercialeditions.html">Qt Enterprise Edition</a>.
\endif
HTTP.
\if defined(commercial_edition)
It is part of the <a href="commercialeditions.html">Qt Enterprise Edition</a>.
\endif
\ingroup io
\module network
This class is used in the QHttp class to report the header
information if the client requests something from the server.
HTTP requests have a method which describes the request's action.
The most common requests are "GET" and "POST". In addition to the
request method the header also includes a request-URI to specify
the location for the method to use.
The method, request-URI and protocol-version can be set using a
constructor or later using setRequest(). The values can be
obtained using method(), path(), majorVersion() and
minorVersion().
This class is a QHttpHeader subclass so that class's functions,
e.g. \link QHttpHeader::setValue() setValue()\endlink, \link
QHttpHeader::value() value()\endlink, etc. are also available.
\sa QHttpResponseHeader QHttp
\important value() setValue()
*/
/*!
Constructs an empty HTTP request header.
*/
QHttpRequestHeader::QHttpRequestHeader()
: QHttpHeader()
{
setValid( FALSE );
}
/*!
Constructs a HTTP request header for the method \a method, the
request-URI \a path and the protocol-version \a majorVer and \a minorVer.
*/
QHttpRequestHeader::QHttpRequestHeader( const QString& method, const QString& path, int majorVer, int minorVer )
: QHttpHeader(), m( method ), p( path ), majVer( majorVer ), minVer( minorVer )
{
}
/*!
Constructs a copy of \a header.
*/
QHttpRequestHeader::QHttpRequestHeader( const QHttpRequestHeader& header )
: QHttpHeader( header ), m( header.m ), p( header.p ), majVer( header.majVer ), minVer( header.minVer )
{
}
/*!
Constructs a HTTP request header from the string \a str. The \a
str should consist of one or more "\r\n" delimited lines; the first line
should be the request-line (format: method, space, request-URI, space
HTTP-version); each of the remaining lines should have the format key,
colon, space, value.
*/
QHttpRequestHeader::QHttpRequestHeader( const QString& str )
: QHttpHeader()
{
parse( str );
}
/*!
This function sets the request method to \a method, the
request-URI to \a path and the protocol-version to \a majorVer and
\a minorVer.
\sa method() path() majorVersion() minorVersion()
*/
void QHttpRequestHeader::setRequest( const QString& method, const QString& path, int majorVer, int minorVer )
{
setValid( TRUE );
m = method;
p = path;
majVer = majorVer;
minVer = minorVer;
}
/*!
Returns the method of the HTTP request header.
\sa path() majorVersion() minorVersion() setRequest()
*/
QString QHttpRequestHeader::method() const
{
return m;
}
/*!
Returns the request-URI of the HTTP request header.
\sa method() majorVersion() minorVersion() setRequest()
*/
QString QHttpRequestHeader::path() const
{
return p;
}
/*!
Returns the major protocol-version of the HTTP request header.
\sa minorVersion() method() path() setRequest()
*/
int QHttpRequestHeader::majorVersion() const
{
return majVer;
}
/*!
Returns the minor protocol-version of the HTTP request header.
\sa majorVersion() method() path() setRequest()
*/
int QHttpRequestHeader::minorVersion() const
{
return minVer;
}
/*! \reimp
*/
bool QHttpRequestHeader::parseLine( const QString& line, int number )
{
if ( number != 0 )
return QHttpHeader::parseLine( line, number );
QStringList lst = QStringList::split( " ", line.simplifyWhiteSpace() );
if ( lst.count() > 0 ) {
m = lst[0];
if ( lst.count() > 1 ) {
p = lst[1];
if ( lst.count() > 2 ) {
QString v = lst[2];
if ( v.length() >= 8 && v.left( 5 ) == "HTTP/" &&
v[5].isDigit() && v[6] == '.' && v[7].isDigit() ) {
majVer = v[5].latin1() - '0';
minVer = v[7].latin1() - '0';
return TRUE;
}
}
}
}
return FALSE;
}
/*! \reimp
*/
QString QHttpRequestHeader::toString() const
{
QString first( "%1 %2");
QString last(" HTTP/%3.%4\r\n%5\r\n" );
return first.arg( m ).arg( p ) +
last.arg( majVer ).arg( minVer ).arg( QHttpHeader::toString());
}
/****************************************************
*
* QHttp
*
****************************************************/
/*!
\class QHttp qhttp.h
\brief The QHttp class provides an implementation of the HTTP protocol.
\if defined(commercial)
It is part of the <a href="commercialeditions.html">Qt Enterprise Edition</a>.
\endif
\ingroup io
\module network
This class provides two different interfaces: one is the
QNetworkProtocol interface that allows you to use HTTP through the
QUrlOperator abstraction. The other is a direct interface to HTTP
that allows you to have more control over the requests and that
allows you to access the response header fields.
Don't mix the two interfaces, since the behavior is not
well-defined.
If you want to use QHttp with the QNetworkProtocol interface, you
do not use it directly, but rather through a QUrlOperator, for
example:
\code
QUrlOperator op( "http://www.trolltech.com" );
op.get( "index.html" );
\endcode
This code will only work if the QHttp class is registered; to
register the class, you must call qInitNetworkProtocols() before
using a QUrlOperator with HTTP.
The QNetworkProtocol interface for HTTP only supports the
operations operationGet() and operationPut(), i.e.
QUrlOperator::get() and QUrlOperator::put(), if you use it with a
QUrlOperator.
The rest of this descrption describes the direct interface to
HTTP.
The class works asynchronously, so there are no blocking
functions. If an operation cannot be executed immediately, the
function will still return straight away and the operation will be
scheduled for later execution. The results of scheduled operations
are reported via signals. This approach depends on the event loop
being in operation.
The operations that can be scheduled (they are called "requests"
in the rest of the documentation) are the following: setHost(),
get(), post(), head() and request().
All of these requests return a unique identifier that allows you
to keep track of the request that is currently executed. When the
execution of a request starts, the requestStarted() signal with
the identifier is emitted and when the request is finished, the
requestFinished() signal is emitted with the identifier and a bool
that indicates if the request finished with an error.
To make an HTTP request you must set up suitable HTTP headers. The
following example demonstrates, how to request the main HTML page
from the Trolltech home page (i.e. the URL
http://www.trolltech.com/index.html):
\code
QHttpRequestHeader header( "GET", "/index.html" );
header.setValue( "Host", "www.trolltech.com" );
http->setHost( "www.trolltech.com" );
http->request( header );
\endcode
For the common HTTP requests \c GET, \c POST and \c HEAD, QHttp
provides the convenience functions get(), post() and head(). They
already use a reasonable header and if you don't have to set
special header fields, they are easier to use. The above example
can also be written as:
\code
http->setHost( "www.trolltech.com" ); // id == 1
http->get( "/index.html" ); // id == 2
\endcode
For this example the following sequence of signals is emitted
(with small variations, depending on network traffic, etc.):
\code
requestStarted( 1 )
requestFinished( 1, FALSE )
requestStarted( 2 )
stateChanged( Connecting )
stateChanged( Sending )
dataSendProgress( 77, 77 )
stateChanged( Reading )
responseHeaderReceived( responseheader )
dataReadProgress( 5388, 0 )
readyRead( responseheader )
dataReadProgress( 18300, 0 )
readyRead( responseheader )
stateChanged( Connected )
requestFinished( 2, FALSE )
done( FALSE )
stateChanged( Closing )
stateChanged( Unconnected )
\endcode
The dataSendProgress() and dataReadProgress() signals in the above
example are useful if you want to show a \link QProgressBar
progressbar\endlink to inform the user about the progress of the
download. The second argument is the total size of data. In
certain cases it is not possible to know the total amount in
advance, in which case the second argument is 0. (If you connect
to a QProgressBar a total of 0 results in a busy indicator.)
When the response header is read, it is reported with the
responseHeaderReceived() signal.
The readyRead() signal tells you that there is data ready to be
read. The amount of data can then be queried with the
bytesAvailable() function and it can be read with the readBlock()
or readAll() functions.
If an error occurs during the execution of one of the commands in
a sequence of commands, all the pending commands (i.e. scheduled,
but not yet executed commands) are cleared and no signals are
emitted for them.
For example, if you have the following sequence of reqeusts
\code
http->setHost( "www.foo.bar" ); // id == 1
http->get( "/index.html" ); // id == 2
http->post( "register.html", data ); // id == 3
\endcode
and the get() request fails because the host lookup fails, then
the post() request is never executed and the signals would look
like this:
\code
requestStarted( 1 )
requestFinished( 1, FALSE )
requestStarted( 2 )
stateChanged( HostLookup )
requestFinished( 2, TRUE )
done( TRUE )
stateChanged( Unconnected )
\endcode
You can then get details about the error with the error() and
errorString() functions. Note that only unexpected behaviour, like
network failure is considered as an error. If the server response
contains an error status, like a 404 response, this is reported as
a normal response case. So you should always check the \link
QHttpResponseHeader::statusCode() status code \endlink of the
response header.
The functions currentId() and currentRequest() provide more
information about the currently executing request.
The functions hasPendingRequests() and clearPendingRequests()
allow you to query and clear the list of pending requests.
\sa \link network.html Qt Network Documentation \endlink QNetworkProtocol, QUrlOperator QFtp
*/
/*!
Constructs a QHttp object.
*/
QHttp::QHttp()
{
init();
}
/*!
Constructs a QHttp object. The parameters \a parent and \a name
are passed on to the QObject constructor.
*/
QHttp::QHttp( QObject* parent, const char* name )
{
if ( parent )
parent->insertChild( this );
setName( name );
init();
}
/*!
Constructs a QHttp object. Subsequent requests are done by
connecting to the server \a hostname on port \a port. The
parameters \a parent and \a name are passed on to the QObject
constructor.
\sa setHost()
*/
QHttp::QHttp( const QString &hostname, Q_UINT16 port, QObject* parent, const char* name )
{
if ( parent )
parent->insertChild( this );
setName( name );
init();
d->hostname = hostname;
d->port = port;
}
void QHttp::init()
{
bytesRead = 0;
d = new QHttpPrivate;
d->errorString = tr( "Unknown error" );
connect( &d->socket, SIGNAL( connected() ),
this, SLOT( slotConnected() ) );
connect( &d->socket, SIGNAL( connectionClosed() ),
this, SLOT( slotClosed() ) );
connect( &d->socket, SIGNAL( delayedCloseFinished() ),
this, SLOT( slotClosed() ) );
connect( &d->socket, SIGNAL( readyRead() ),
this, SLOT( slotReadyRead() ) );
connect( &d->socket, SIGNAL( error(int) ),
this, SLOT( slotError(int) ) );
connect( &d->socket, SIGNAL( bytesWritten(int) ),
this, SLOT( slotBytesWritten(int) ) );
d->idleTimer = startTimer( 0 );
}
/*!
Destroys the QHttp object. If there is an open connection, it is
closed.
*/
QHttp::~QHttp()
{
abort();
delete d;
}
/*!
\enum QHttp::State
This enum is used to specify the state the client is in:
\value Unconnected There is no connection to the host.
\value HostLookup A host name lookup is in progress.
\value Connecting An attempt to connect to the host is in progress.
\value Sending The client is sending its request to the server.
\value Reading The client's request has been sent and the client
is reading the server's response.
\value Connected The connection to the host is open, but the client is
neither sending a request, nor waiting for a response.
\value Closing The connection is closing down, but is not yet
closed. (The state will be \c Unconnected when the connection is
closed.)
\sa stateChanged() state()
*/
/*! \enum QHttp::Error
This enum identifies the error that occurred.
\value NoError No error occurred.
\value HostNotFound The host name lookup failed.
\value ConnectionRefused The server refused the connection.
\value UnexpectedClose The server closed the connection unexpectedly.
\value InvalidResponseHeader The server sent an invalid response header.
\value WrongContentLength The client could not read the content correctly
because an error with respect to the content length occurred.
\value Aborted The request was aborted with abort().
\value UnknownError An error other than those specified above
occurred.
\sa error()
*/
/*!
\fn void QHttp::stateChanged( int state )
This signal is emitted when the state of the QHttp object changes.
The argument \a state is the new state of the connection; it is
one of the \l State values.
This usually happens when a request is started, but it can also
happen when the server closes the connection or when a call to
closeConnection() succeeded.
\sa get() post() head() request() closeConnection() state() State
*/
/*!
\fn void QHttp::responseHeaderReceived( const QHttpResponseHeader& resp )
This signal is emitted when the HTTP header of a server response
is available. The header is passed in \a resp.
\sa get() post() head() request() readyRead()
*/
/*!
\fn void QHttp::readyRead( const QHttpResponseHeader& resp )
This signal is emitted when there is new response data to read.
If you specified a device in the request where the data should be
written to, then this signal is \e not emitted; instead the data
is written directly to the device.
The response header is passed in \a resp.
You can read the data with the readAll() or readBlock() functions
This signal is useful if you want to process the data in chunks as
soon as it becomes available. If you are only interested in the
complete data, just connect to the requestFinished() signal and
read the data then instead.
\sa get() post() request() readAll() readBlock() bytesAvailable()
*/
/*!
\fn void QHttp::dataSendProgress( int done, int total )
This signal is emitted when this object sends data to a HTTP
server to inform it about the progress of the upload.
\a done is the amount of data that has already arrived and \a
total is the total amount of data. It is possible that the total
amount of data that should be transferred cannot be determined, in
which case \a total is 0.(If you connect to a QProgressBar, the
progress bar shows a busy indicator if the total is 0).
\warning \a done and \a total are not necessarily the size in
bytes, since for large files these values might need to be
"scaled" to avoid overflow.
\sa dataReadProgress() post() request() QProgressBar::setProgress()
*/
/*!
\fn void QHttp::dataReadProgress( int done, int total )
This signal is emitted when this object reads data from a HTTP
server to indicate the current progress of the download.
\a done is the amount of data that has already arrived and \a
total is the total amount of data. It is possible that the total
amount of data that should be transferred cannot be determined, in
which case \a total is 0.(If you connect to a QProgressBar, the
progress bar shows a busy indicator if the total is 0).
\warning \a done and \a total are not necessarily the size in
bytes, since for large files these values might need to be
"scaled" to avoid overflow.
\sa dataSendProgress() get() post() request() QProgressBar::setProgress()
*/
/*!
\fn void QHttp::requestStarted( int id )
This signal is emitted when processing the request identified by
\a id starts.
\sa requestFinished() done()
*/
/*!
\fn void QHttp::requestFinished( int id, bool error )
This signal is emitted when processing the request identified by
\a id has finished. \a error is TRUE if an error occurred during
the processing; otherwise \a error is FALSE.
\sa requestStarted() done() error() errorString()
*/
/*!
\fn void QHttp::done( bool error )
This signal is emitted when the last pending request has finished;
(it is emitted after the last request's requestFinished() signal).
\a error is TRUE if an error occurred during the processing;
otherwise \a error is FALSE.
\sa requestFinished() error() errorString()
*/
/*!
Aborts the current request and deletes all scheduled requests.
For the current request, the requestFinished() signal with the \c
error argument \c TRUE is emitted. For all other requests that are
affected by the abort(), no signals are emitted.
Since this slot also deletes the scheduled requests, there are no
requests left and the done() signal is emitted (with the \c error
argument \c TRUE).
\sa clearPendingRequests()
*/
void QHttp::abort()
{
QHttpRequest *r = d->pending.getFirst();
if ( r == 0 )
return;
finishedWithError( tr("Request aborted"), Aborted );
clearPendingRequests();
d->socket.clearPendingData();
close();
}
/*!
Returns the number of bytes that can be read from the response
content at the moment.
\sa get() post() request() readyRead() readBlock() readAll()
*/
Q_ULONG QHttp::bytesAvailable() const
{
#if defined(QHTTP_DEBUG)
qDebug( "QHttp::bytesAvailable(): %d bytes", (int)d->rba.size() );
#endif
return d->rba.size();
}
/*!
Reads \a maxlen bytes from the response content into \a data and
returns the number of bytes read. Returns -1 if an error occurred.
\sa get() post() request() readyRead() bytesAvailable() readAll()
*/
Q_LONG QHttp::readBlock( char *data, Q_ULONG maxlen )
{
if ( data == 0 && maxlen != 0 ) {
#if defined(QT_CHECK_NULL)
qWarning( "QHttp::readBlock: Null pointer error" );
#endif
return -1;
}
if ( maxlen >= d->rba.size() )
maxlen = d->rba.size();
d->rba.consumeBytes( maxlen, data );
d->bytesDone += maxlen;
#if defined(QHTTP_DEBUG)
qDebug( "QHttp::readBlock(): read %d bytes (%d bytes done)", (int)maxlen, d->bytesDone );
#endif
return maxlen;
}
/*!
Reads all the bytes from the response content and returns them.
\sa get() post() request() readyRead() bytesAvailable() readBlock()
*/
QByteArray QHttp::readAll()
{
Q_ULONG avail = bytesAvailable();
QByteArray tmp( avail );
Q_LONG read = readBlock( tmp.data(), avail );
tmp.resize( read );
return tmp;
}
/*!
Returns the identifier of the HTTP request being executed or 0 if
there is no request being executed (i.e. they've all finished).
\sa currentRequest()
*/
int QHttp::currentId() const
{
QHttpRequest *r = d->pending.getFirst();
if ( r == 0 )
return 0;
return r->id;
}
/*!
Returns the request header of the HTTP request being executed. If
the request is one issued by setHost() or closeConnection(), it
returns an invalid request header, i.e.
QHttpRequestHeader::isValid() returns FALSE.
\sa currentId()
*/
QHttpRequestHeader QHttp::currentRequest() const
{
QHttpRequest *r = d->pending.getFirst();
if ( r != 0 && r->hasRequestHeader() )
return r->requestHeader();
return QHttpRequestHeader();
}
/*!
Returns the QIODevice pointer that is used as the data source of the HTTP
request being executed. If there is no current request or if the request
does not use an IO device as the data source, this function returns 0.
This function can be used to delete the QIODevice in the slot connected to
the requestFinished() signal.
\sa currentDestinationDevice() post() request()
*/
QIODevice* QHttp::currentSourceDevice() const
{
QHttpRequest *r = d->pending.getFirst();
if ( !r )
return 0;
return r->sourceDevice();
}
/*!
Returns the QIODevice pointer that is used as to store the data of the HTTP
request being executed. If there is no current request or if the request
does not store the data to an IO device, this function returns 0.
This function can be used to delete the QIODevice in the slot connected to
the requestFinished() signal.
\sa currentDestinationDevice() get() post() request()
*/
QIODevice* QHttp::currentDestinationDevice() const
{
QHttpRequest *r = d->pending.getFirst();
if ( !r )
return 0;
return r->destinationDevice();
}
/*!
Returns TRUE if there are any requests scheduled that have not yet
been executed; otherwise returns FALSE.
The request that is being executed is \e not considered as a
scheduled request.
\sa clearPendingRequests() currentId() currentRequest()
*/
bool QHttp::hasPendingRequests() const
{
return d->pending.count() > 1;
}
/*!
Deletes all pending requests from the list of scheduled requests.
This does not affect the request that is being executed. If
you want to stop this this as well, use abort().
\sa hasPendingRequests() abort()
*/
void QHttp::clearPendingRequests()
{
QHttpRequest *r = 0;
if ( d->pending.count() > 0 )
r = d->pending.take( 0 );
d->pending.clear();
if ( r )
d->pending.append( r );
}
/*!
Sets the HTTP server that is used for requests to \a hostname on
port \a port.
The function does not block and returns immediately. The request
is scheduled, and its execution is performed asynchronously. The
function returns a unique identifier which is passed by
requestStarted() and requestFinished().
When the request is started the requestStarted() signal is
emitted. When it is finished the requestFinished() signal is
emitted.
\sa get() post() head() request() requestStarted() requestFinished() done()
*/
int QHttp::setHost(const QString &hostname, Q_UINT16 port )
{
return addRequest( new QHttpSetHostRequest( hostname, port ) );
}
/*!
Sends a get request for \a path to the server set by setHost() or
as specified in the constructor.
\a path must be an absolute path like \c /index.html or an
absolute URI like \c http://www.trolltech.com/index.html.
If the IO device \a to is 0 the readyRead() signal is emitted
every time new content data is available to read.
If the IO device \a to is not 0, the content data of the response
is written directly to the device. Make sure that the \a to
pointer is valid for the duration of the operation (it is safe to
delete it when the requestFinished() signal is emitted).
The function does not block and returns immediately. The request
is scheduled, and its execution is performed asynchronously. The
function returns a unique identifier which is passed by
requestStarted() and requestFinished().
When the request is started the requestStarted() signal is
emitted. When it is finished the requestFinished() signal is
emitted.
\sa setHost() post() head() request() requestStarted() requestFinished() done()
*/
int QHttp::get( const QString& path, QIODevice* to )
{
QHttpRequestHeader header( "GET", path );
header.setValue( "Connection", "Keep-Alive" );
return addRequest( new QHttpPGHRequest( header, (QIODevice*)0, to ) );
}
/*!
Sends a post request for \a path to the server set by setHost() or
as specified in the constructor.
\a path must be an absolute path like \c /index.html or an
absolute URI like \c http://www.trolltech.com/index.html.
The incoming data comes via the \a data IO device.
If the IO device \a to is 0 the readyRead() signal is emitted
every time new content data is available to read.
If the IO device \a to is not 0, the content data of the response
is written directly to the device. Make sure that the \a to
pointer is valid for the duration of the operation (it is safe to
delete it when the requestFinished() signal is emitted).
The function does not block and returns immediately. The request
is scheduled, and its execution is performed asynchronously. The
function returns a unique identifier which is passed by
requestStarted() and requestFinished().
When the request is started the requestStarted() signal is
emitted. When it is finished the requestFinished() signal is
emitted.
\sa setHost() get() head() request() requestStarted() requestFinished() done()
*/
int QHttp::post( const QString& path, QIODevice* data, QIODevice* to )
{
QHttpRequestHeader header( "POST", path );
header.setValue( "Connection", "Keep-Alive" );
return addRequest( new QHttpPGHRequest( header, data, to ) );
}
/*!
\overload
\a data is used as the content data of the HTTP request.
*/
int QHttp::post( const QString& path, const QByteArray& data, QIODevice* to )
{
QHttpRequestHeader header( "POST", path );
header.setValue( "Connection", "Keep-Alive" );
return addRequest( new QHttpPGHRequest( header, new QByteArray(data), to ) );
}
/*!
Sends a header request for \a path to the server set by setHost()
or as specified in the constructor.
\a path must be an absolute path like \c /index.html or an
absolute URI like \c http://www.trolltech.com/index.html.
The function does not block and returns immediately. The request
is scheduled, and its execution is performed asynchronously. The
function returns a unique identifier which is passed by
requestStarted() and requestFinished().
When the request is started the requestStarted() signal is
emitted. When it is finished the requestFinished() signal is
emitted.
\sa setHost() get() post() request() requestStarted() requestFinished() done()
*/
int QHttp::head( const QString& path )
{
QHttpRequestHeader header( "HEAD", path );
header.setValue( "Connection", "Keep-Alive" );
return addRequest( new QHttpPGHRequest( header, (QIODevice*)0, 0 ) );
}
/*!
Sends a request to the server set by setHost() or as specified in
the constructor. Uses the \a header as the HTTP request header.
You are responsible for setting up a header that is appropriate
for your request.
The incoming data comes via the \a data IO device.
If the IO device \a to is 0 the readyRead() signal is emitted
every time new content data is available to read.
If the IO device \a to is not 0, the content data of the response
is written directly to the device. Make sure that the \a to
pointer is valid for the duration of the operation (it is safe to
delete it when the requestFinished() signal is emitted).
The function does not block and returns immediately. The request
is scheduled, and its execution is performed asynchronously. The
function returns a unique identifier which is passed by
requestStarted() and requestFinished().
When the request is started the requestStarted() signal is
emitted. When it is finished the requestFinished() signal is
emitted.
\sa setHost() get() post() head() requestStarted() requestFinished() done()
*/
int QHttp::request( const QHttpRequestHeader &header, QIODevice *data, QIODevice *to )
{
return addRequest( new QHttpNormalRequest( header, data, to ) );
}
/*!
\overload
\a data is used as the content data of the HTTP request.
*/
int QHttp::request( const QHttpRequestHeader &header, const QByteArray &data, QIODevice *to )
{
return addRequest( new QHttpNormalRequest( header, new QByteArray(data), to ) );
}
/*!
Closes the connection; this is useful if you have a keep-alive
connection and want to close it.
For the requests issued with get(), post() and head(), QHttp sets
the connection to be keep-alive. You can also do this using the
header you pass to the request() function. QHttp only closes the
connection to the HTTP server if the response header requires it
to do so.
The function does not block and returns immediately. The request
is scheduled, and its execution is performed asynchronously. The
function returns a unique identifier which is passed by
requestStarted() and requestFinished().
When the request is started the requestStarted() signal is
emitted. When it is finished the requestFinished() signal is
emitted.
If you want to close the connection immediately, you have to use
abort() instead.
\sa stateChanged() abort() requestStarted() requestFinished() done()
*/
int QHttp::closeConnection()
{
return addRequest( new QHttpCloseRequest() );
}
int QHttp::addRequest( QHttpRequest *req )
{
d->pending.append( req );
if ( d->pending.count() == 1 )
// don't emit the requestStarted() signal before the id is returned
QTimer::singleShot( 0, this, SLOT(startNextRequest()) );
return req->id;
}
void QHttp::startNextRequest()
{
QHttpRequest *r = d->pending.getFirst();
if ( r == 0 )
return;
d->error = NoError;
d->errorString = tr( "Unknown error" );
if ( bytesAvailable() )
readAll(); // clear the data
emit requestStarted( r->id );
r->start( this );
}
void QHttp::sendRequest()
{
if ( d->hostname.isNull() ) {
finishedWithError( tr("No server set to connect to"), UnknownError );
return;
}
killIdleTimer();
// Do we need to setup a new connection or can we reuse an
// existing one ?
if ( d->socket.peerName() != d->hostname || d->socket.peerPort() != d->port
|| d->socket.state() != QSocket::Connection ) {
setState( QHttp::Connecting );
d->socket.connectToHost( d->hostname, d->port );
} else {
slotConnected();
}
}
void QHttp::finishedWithSuccess()
{
QHttpRequest *r = d->pending.getFirst();
if ( r == 0 )
return;
emit requestFinished( r->id, FALSE );
d->pending.removeFirst();
if ( d->pending.isEmpty() ) {
emit done( FALSE );
} else {
startNextRequest();
}
}
void QHttp::finishedWithError( const QString& detail, int errorCode )
{
QHttpRequest *r = d->pending.getFirst();
if ( r == 0 )
return;
d->error = (Error)errorCode;
d->errorString = detail;
emit requestFinished( r->id, TRUE );
d->pending.clear();
emit done( TRUE );
}
void QHttp::slotClosed()
{
if ( d->state == Closing )
return;
if ( d->state == Reading ) {
if ( d->response.hasKey( "content-length" ) ) {
// We got Content-Length, so did we get all bytes?
if ( d->bytesDone+bytesAvailable() != d->response.contentLength() ) {
finishedWithError( tr("Wrong content length"), WrongContentLength );
}
}
} else if ( d->state == Connecting || d->state == Sending ) {
finishedWithError( tr("Server closed connection unexpectedly"), UnexpectedClose );
}
d->postDevice = 0;
setState( Closing );
d->idleTimer = startTimer( 0 );
}
void QHttp::slotConnected()
{
if ( d->state != Sending ) {
d->bytesDone = 0;
setState( Sending );
}
QString str = d->header.toString();
d->bytesTotal = str.length();
d->socket.writeBlock( str.latin1(), d->bytesTotal );
#if defined(QHTTP_DEBUG)
qDebug( "QHttp: write request header:\n---{\n%s}---", str.latin1() );
#endif
if ( d->postDevice ) {
d->bytesTotal += d->postDevice->size();
} else {
d->bytesTotal += d->buffer.size();
d->socket.writeBlock( d->buffer.data(), d->buffer.size() );
d->buffer = QByteArray(); // save memory
}
}
void QHttp::slotError( int err )
{
d->postDevice = 0;
if ( d->state == Connecting || d->state == Reading || d->state == Sending ) {
switch ( err ) {
case QSocket::ErrConnectionRefused:
finishedWithError( tr("Connection refused"), ConnectionRefused );
break;
case QSocket::ErrHostNotFound:
finishedWithError( tr("Host %1 not found").arg(d->socket.peerName()), HostNotFound );
break;
default:
finishedWithError( tr("HTTP request failed"), UnknownError );
break;
}
}
close();
}
void QHttp::slotBytesWritten( int written )
{
d->bytesDone += written;
emit dataSendProgress( d->bytesDone, d->bytesTotal );
if ( !d->postDevice )
return;
if ( d->socket.bytesToWrite() == 0 ) {
int max = QMIN( 4096, d->postDevice->size() - d->postDevice->at() );
QByteArray arr( max );
int n = d->postDevice->readBlock( arr.data(), max );
if ( n != max ) {
qWarning("Could not read enough bytes from the device");
close();
return;
}
if ( d->postDevice->atEnd() ) {
d->postDevice = 0;
}
d->socket.writeBlock( arr.data(), max );
}
}
void QHttp::slotReadyRead()
{
if ( d->state != Reading ) {
setState( Reading );
d->buffer = QByteArray();
d->readHeader = TRUE;
d->headerStr = "";
d->bytesDone = 0;
d->chunkedSize = -1;
}
while ( d->readHeader ) {
bool end = FALSE;
QString tmp;
while ( !end && d->socket.canReadLine() ) {
tmp = d->socket.readLine();
if ( tmp == "\r\n" || tmp == "\n" )
end = TRUE;
else
d->headerStr += tmp;
}
if ( !end )
return;
#if defined(QHTTP_DEBUG)
qDebug( "QHttp: read response header:\n---{\n%s}---", d->headerStr.latin1() );
#endif
d->response = QHttpResponseHeader( d->headerStr );
d->headerStr = "";
#if defined(QHTTP_DEBUG)
qDebug( "QHttp: read response header:\n---{\n%s}---", d->response.toString().latin1() );
#endif
// Check header
if ( !d->response.isValid() ) {
finishedWithError( tr("Invalid HTTP response header"), InvalidResponseHeader );
close();
return;
}
// The 100-continue header is ignored, because when using the
// POST method, we send both the request header and data in
// one chunk.
if (d->response.statusCode() != 100) {
d->readHeader = FALSE;
if ( d->response.hasKey( "transfer-encoding" ) &&
d->response.value( "transfer-encoding" ).lower().contains( "chunked" ) )
d->chunkedSize = 0;
emit responseHeaderReceived( d->response );
}
}
if ( !d->readHeader ) {
bool everythingRead = FALSE;
if ( currentRequest().method() == "HEAD" ) {
everythingRead = TRUE;
} else {
Q_ULONG n = d->socket.bytesAvailable();
QByteArray *arr = 0;
if ( d->chunkedSize != -1 ) {
// transfer-encoding is chunked
for ( ;; ) {
// get chunk size
if ( d->chunkedSize == 0 ) {
if ( !d->socket.canReadLine() )
break;
QString sizeString = d->socket.readLine();
int tPos = sizeString.find( ';' );
if ( tPos != -1 )
sizeString.truncate( tPos );
bool ok;
d->chunkedSize = sizeString.toInt( &ok, 16 );
if ( !ok ) {
finishedWithError( tr("Invalid HTTP chunked body"), WrongContentLength );
close();
delete arr;
return;
}
if ( d->chunkedSize == 0 ) // last-chunk
d->chunkedSize = -2;
}
// read trailer
while ( d->chunkedSize == -2 && d->socket.canReadLine() ) {
QString read = d->socket.readLine();
if ( read == "\r\n" || read == "\n" )
d->chunkedSize = -1;
}
if ( d->chunkedSize == -1 ) {
everythingRead = TRUE;
break;
}
// make sure that you can read the terminating CRLF,
// otherwise wait until next time...
n = d->socket.bytesAvailable();
if ( n == 0 )
break;
if ( (Q_LONG)n == d->chunkedSize || (Q_LONG)n == d->chunkedSize+1 ) {
n = d->chunkedSize - 1;
if ( n == 0 )
break;
}
// read data
uint toRead = QMIN( (Q_LONG)n, (d->chunkedSize < 0 ? (Q_LONG)n : d->chunkedSize) );
if ( !arr )
arr = new QByteArray( 0 );
uint oldArrSize = arr->size();
arr->resize( oldArrSize + toRead );
Q_LONG read = d->socket.readBlock( arr->data()+oldArrSize, toRead );
arr->resize( oldArrSize + read );
d->chunkedSize -= read;
if ( d->chunkedSize == 0 && n - read >= 2 ) {
// read terminating CRLF
char tmp[2];
d->socket.readBlock( tmp, 2 );
if ( tmp[0] != '\r' || tmp[1] != '\n' ) {
finishedWithError( tr("Invalid HTTP chunked body"), WrongContentLength );
close();
return;
}
}
}
} else if ( d->response.hasContentLength() ) {
n = QMIN( d->response.contentLength() - d->bytesDone, n );
if ( n > 0 ) {
arr = new QByteArray( n );
Q_LONG read = d->socket.readBlock( arr->data(), n );
arr->resize( read );
}
if ( d->bytesDone + bytesAvailable() + n == d->response.contentLength() )
everythingRead = TRUE;
} else if ( n > 0 ) {
// workaround for VC++ bug
QByteArray temp = d->socket.readAll();
arr = new QByteArray( temp );
}
if ( arr ) {
n = arr->size();
if ( d->toDevice ) {
d->toDevice->writeBlock( arr->data(), n );
delete arr;
d->bytesDone += n;
#if defined(QHTTP_DEBUG)
qDebug( "QHttp::slotReadyRead(): read %ld bytes (%d bytes done)", n, d->bytesDone );
#endif
if ( d->response.hasContentLength() )
emit dataReadProgress( d->bytesDone, d->response.contentLength() );
else
emit dataReadProgress( d->bytesDone, 0 );
} else {
d->rba.append( arr );
#if defined(QHTTP_DEBUG)
qDebug( "QHttp::slotReadyRead(): read %ld bytes (%ld bytes done)", n, d->bytesDone + bytesAvailable() );
#endif
if ( d->response.hasContentLength() )
emit dataReadProgress( d->bytesDone + bytesAvailable(), d->response.contentLength() );
else
emit dataReadProgress( d->bytesDone + bytesAvailable(), 0 );
emit readyRead( d->response );
}
}
}
if ( everythingRead ) {
// Handle "Connection: close"
if ( d->response.value("connection").lower() == "close" ) {
close();
} else {
setState( Connected );
// Start a timer, so that we emit the keep alive signal
// "after" this method returned.
d->idleTimer = startTimer( 0 );
}
}
}
}
/*!
Returns the current state of the object. When the state changes,
the stateChanged() signal is emitted.
\sa State stateChanged()
*/
QHttp::State QHttp::state() const
{
return d->state;
}
/*!
Returns the last error that occurred. This is useful to find out
what happened when receiving a requestFinished() or a done()
signal with the \c error argument \c TRUE.
If you start a new request, the error status is reset to \c NoError.
*/
QHttp::Error QHttp::error() const
{
return d->error;
}
/*!
Returns a human-readable description of the last error that
occurred. This is useful to present a error message to the user
when receiving a requestFinished() or a done() signal with the \c
error argument \c TRUE.
*/
QString QHttp::errorString() const
{
return d->errorString;
}
/*! \reimp
*/
void QHttp::timerEvent( QTimerEvent *e )
{
if ( e->timerId() == d->idleTimer ) {
killTimer( d->idleTimer );
d->idleTimer = 0;
if ( d->state == Connected ) {
finishedWithSuccess();
} else if ( d->state != Unconnected ) {
setState( Unconnected );
finishedWithSuccess();
}
} else {
QObject::timerEvent( e );
}
}
void QHttp::killIdleTimer()
{
killTimer( d->idleTimer );
d->idleTimer = 0;
}
void QHttp::setState( int s )
{
#if defined(QHTTP_DEBUG)
qDebug( "QHttp state changed %d -> %d", d->state, s );
#endif
d->state = (State)s;
emit stateChanged( s );
}
void QHttp::close()
{
// If no connection is open -> ignore
if ( d->state == Closing || d->state == Unconnected )
return;
d->postDevice = 0;
setState( Closing );
// Already closed ?
if ( !d->socket.isOpen() ) {
d->idleTimer = startTimer( 0 );
} else {
// Close now.
d->socket.close();
// Did close succeed immediately ?
if ( d->socket.state() == QSocket::Idle ) {
// Prepare to emit the requestFinished() signal.
d->idleTimer = startTimer( 0 );
}
}
}
/**********************************************************************
*
* QHttp implementation of the QNetworkProtocol interface
*
*********************************************************************/
/*! \reimp
*/
int QHttp::supportedOperations() const
{
return OpGet | OpPut;
}
/*! \reimp
*/
void QHttp::operationGet( QNetworkOperation *op )
{
connect( this, SIGNAL(readyRead(const QHttpResponseHeader&)),
this, SLOT(clientReply(const QHttpResponseHeader&)) );
connect( this, SIGNAL(done(bool)),
this, SLOT(clientDone(bool)) );
connect( this, SIGNAL(stateChanged(int)),
this, SLOT(clientStateChanged(int)) );
bytesRead = 0;
op->setState( StInProgress );
QUrl u( operationInProgress()->arg( 0 ) );
QHttpRequestHeader header( "GET", u.encodedPathAndQuery(), 1, 0 );
header.setValue( "Host", u.host() );
setHost( u.host(), u.port() != -1 ? u.port() : 80 );
request( header );
}
/*! \reimp
*/
void QHttp::operationPut( QNetworkOperation *op )
{
connect( this, SIGNAL(readyRead(const QHttpResponseHeader&)),
this, SLOT(clientReply(const QHttpResponseHeader&)) );
connect( this, SIGNAL(done(bool)),
this, SLOT(clientDone(bool)) );
connect( this, SIGNAL(stateChanged(int)),
this, SLOT(clientStateChanged(int)) );
bytesRead = 0;
op->setState( StInProgress );
QUrl u( operationInProgress()->arg( 0 ) );
QHttpRequestHeader header( "POST", u.encodedPathAndQuery(), 1, 0 );
header.setValue( "Host", u.host() );
setHost( u.host(), u.port() != -1 ? u.port() : 80 );
request( header, op->rawArg(1) );
}
void QHttp::clientReply( const QHttpResponseHeader &rep )
{
QNetworkOperation *op = operationInProgress();
if ( op ) {
if ( rep.statusCode() >= 400 && rep.statusCode() < 600 ) {
op->setState( StFailed );
op->setProtocolDetail(
QString("%1 %2").arg(rep.statusCode()).arg(rep.reasonPhrase())
);
switch ( rep.statusCode() ) {
case 401:
case 403:
case 405:
op->setErrorCode( ErrPermissionDenied );
break;
case 404:
op->setErrorCode(ErrFileNotExisting );
break;
default:
if ( op->operation() == OpGet )
op->setErrorCode( ErrGet );
else
op->setErrorCode( ErrPut );
break;
}
}
// ### In cases of an error, should we still emit the data() signals?
if ( op->operation() == OpGet && bytesAvailable() > 0 ) {
QByteArray ba = readAll();
emit data( ba, op );
bytesRead += ba.size();
if ( rep.hasContentLength() ) {
emit dataTransferProgress( bytesRead, rep.contentLength(), op );
}
}
}
}
void QHttp::clientDone( bool err )
{
disconnect( this, SIGNAL(readyRead(const QHttpResponseHeader&)),
this, SLOT(clientReply(const QHttpResponseHeader&)) );
disconnect( this, SIGNAL(done(bool)),
this, SLOT(clientDone(bool)) );
disconnect( this, SIGNAL(stateChanged(int)),
this, SLOT(clientStateChanged(int)) );
if ( err ) {
QNetworkOperation *op = operationInProgress();
if ( op ) {
op->setState( QNetworkProtocol::StFailed );
op->setProtocolDetail( errorString() );
switch ( error() ) {
case ConnectionRefused:
op->setErrorCode( ErrHostNotFound );
break;
case HostNotFound:
op->setErrorCode( ErrHostNotFound );
break;
default:
if ( op->operation() == OpGet )
op->setErrorCode( ErrGet );
else
op->setErrorCode( ErrPut );
break;
}
emit finished( op );
}
} else {
QNetworkOperation *op = operationInProgress();
if ( op ) {
if ( op->state() != StFailed ) {
op->setState( QNetworkProtocol::StDone );
op->setErrorCode( QNetworkProtocol::NoError );
}
emit finished( op );
}
}
}
void QHttp::clientStateChanged( int state )
{
if ( url() ) {
switch ( (State)state ) {
case Connecting:
emit connectionStateChanged( ConHostFound, tr( "Host %1 found" ).arg( url()->host() ) );
break;
case Sending:
emit connectionStateChanged( ConConnected, tr( "Connected to host %1" ).arg( url()->host() ) );
break;
case Unconnected:
emit connectionStateChanged( ConClosed, tr( "Connection to %1 closed" ).arg( url()->host() ) );
break;
default:
break;
}
} else {
switch ( (State)state ) {
case Connecting:
emit connectionStateChanged( ConHostFound, tr( "Host found" ) );
break;
case Sending:
emit connectionStateChanged( ConConnected, tr( "Connected to host" ) );
break;
case Unconnected:
emit connectionStateChanged( ConClosed, tr( "Connection closed" ) );
break;
default:
break;
}
}
}
#endif