#!/usr/bin/env python
#############################################################################
##
## Copyright (C) 2010 Riverbank Computing Limited.
## Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
## All rights reserved.
##
## This file is part of the examples of PyQt.
##
## $QT_BEGIN_LICENSE:BSD$
## You may use this file under the terms of the BSD license as follows:
##
## "Redistribution and use in source and binary forms, with or without
## modification, are permitted provided that the following conditions are
## met:
## * Redistributions of source code must retain the above copyright
## notice, this list of conditions and the following disclaimer.
## * Redistributions in binary form must reproduce the above copyright
## notice, this list of conditions and the following disclaimer in
## the documentation and/or other materials provided with the
## distribution.
## * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
## the names of its contributors may be used to endorse or promote
## products derived from this software without specific prior written
## permission.
##
## THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
## "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
## LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
## A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
## OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
## SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
## LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
## DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
## THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
## (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
## OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
## $QT_END_LICENSE$
##
#############################################################################
from PyQt5.QtCore import QDir, QFile, QFileInfo, QIODevice, QUrl
from PyQt5.QtWidgets import (QApplication, QDialog, QDialogButtonBox,
QHBoxLayout, QLabel, QLineEdit, QMessageBox, QProgressDialog,
QPushButton, QVBoxLayout)
from PyQt5.QtNetwork import QNetworkAccessManager, QNetworkRequest
class HttpWindow(QDialog):
def __init__(self, parent=None):
super(HttpWindow, self).__init__(parent)
self.url = QUrl()
self.qnam = QNetworkAccessManager()
self.reply = None
self.outFile = None
self.httpGetId = 0
self.httpRequestAborted = False
self.urlLineEdit = QLineEdit('https://qt-project.org')
urlLabel = QLabel("&URL:")
urlLabel.setBuddy(self.urlLineEdit)
self.statusLabel = QLabel(
"Please enter the URL of a file you want to download.")
self.statusLabel.setWordWrap(True)
self.downloadButton = QPushButton("Download")
self.downloadButton.setDefault(True)
self.quitButton = QPushButton("Quit")
self.quitButton.setAutoDefault(False)
buttonBox = QDialogButtonBox()
buttonBox.addButton(self.downloadButton, QDialogButtonBox.ActionRole)
buttonBox.addButton(self.quitButton, QDialogButtonBox.RejectRole)
self.progressDialog = QProgressDialog(self)
self.urlLineEdit.textChanged.connect(self.enableDownloadButton)
self.qnam.authenticationRequired.connect(
self.slotAuthenticationRequired)
self.qnam.sslErrors.connect(self.sslErrors)
self.progressDialog.canceled.connect(self.cancelDownload)
self.downloadButton.clicked.connect(self.downloadFile)
self.quitButton.clicked.connect(self.close)
topLayout = QHBoxLayout()
topLayout.addWidget(urlLabel)
topLayout.addWidget(self.urlLineEdit)
mainLayout = QVBoxLayout()
mainLayout.addLayout(topLayout)
mainLayout.addWidget(self.statusLabel)
mainLayout.addWidget(buttonBox)
self.setLayout(mainLayout)
self.setWindowTitle("HTTP")
self.urlLineEdit.setFocus()
def startRequest(self, url):
self.reply = self.qnam.get(QNetworkRequest(url))
self.reply.finished.connect(self.httpFinished)
self.reply.readyRead.connect(self.httpReadyRead)
self.reply.downloadProgress.connect(self.updateDataReadProgress)
def downloadFile(self):
self.url = QUrl(self.urlLineEdit.text())
fileInfo = QFileInfo(self.url.path())
fileName = fileInfo.fileName()
if not fileName:
fileName = 'index.html'
if QFile.exists(fileName):
ret = QMessageBox.question(self, "HTTP",
"There already exists a file called %s in the current "
"directory. Overwrite?" % fileName,
QMessageBox.Yes | QMessageBox.No, QMessageBox.No)
if ret == QMessageBox.No:
return
QFile.remove(fileName)
self.outFile = QFile(fileName)
if not self.outFile.open(QIODevice.WriteOnly):
QMessageBox.information(self, "HTTP",
"Unable to save the file %s: %s." % (fileName, self.outFile.errorString()))
self.outFile = None
return
self.progressDialog.setWindowTitle("HTTP")
self.progressDialog.setLabelText("Downloading %s." % fileName)
self.downloadButton.setEnabled(False)
self.httpRequestAborted = False
self.startRequest(self.url)
def cancelDownload(self):
self.statusLabel.setText("Download canceled.")
self.httpRequestAborted = True
self.reply.abort()
self.downloadButton.setEnabled(True)
def httpFinished(self):
if self.httpRequestAborted:
if self.outFile is not None:
self.outFile.close()
self.outFile.remove()
self.outFile = None
self.reply.deleteLater()
self.reply = None
self.progressDialog.hide()
return
self.progressDialog.hide()
self.outFile.flush()
self.outFile.close()
redirectionTarget = self.reply.attribute(QNetworkRequest.RedirectionTargetAttribute)
if self.reply.error():
self.outFile.remove()
QMessageBox.information(self, "HTTP",
"Download failed: %s." % self.reply.errorString())
self.downloadButton.setEnabled(True)
elif redirectionTarget is not None:
newUrl = self.url.resolved(redirectionTarget.toUrl())
ret = QMessageBox.question(self, "HTTP",
"Redirect to %s?" % newUrl.toString(),
QMessageBox.Yes | QMessageBox.No)
if ret == QMessageBox.Yes:
self.url = newUrl
self.reply.deleteLater()
self.reply = None
self.outFile.open(QIODevice.WriteOnly)
self.outFile.resize(0)
self.startRequest(self.url)
return
else:
fileName = QFileInfo(QUrl(self.urlLineEdit.text()).path()).fileName()
self.statusLabel.setText("Downloaded %s to %s." % (fileName, QDir.currentPath()))
self.downloadButton.setEnabled(True)
self.reply.deleteLater()
self.reply = None
self.outFile = None
def httpReadyRead(self):
if self.outFile is not None:
self.outFile.write(self.reply.readAll())
def updateDataReadProgress(self, bytesRead, totalBytes):
if self.httpRequestAborted:
return
self.progressDialog.setMaximum(totalBytes)
self.progressDialog.setValue(bytesRead)
def enableDownloadButton(self):
self.downloadButton.setEnabled(self.urlLineEdit.text() != '')
def slotAuthenticationRequired(self, authenticator):
import os
from PyQt5 import uic
ui = os.path.join(os.path.dirname(__file__), 'authenticationdialog.ui')
dlg = uic.loadUi(ui)
dlg.adjustSize()
dlg.siteDescription.setText("%s at %s" % (authenticator.realm(), self.url.host()))
dlg.userEdit.setText(self.url.userName())
dlg.passwordEdit.setText(self.url.password())
if dlg.exec_() == QDialog.Accepted:
authenticator.setUser(dlg.userEdit.text())
authenticator.setPassword(dlg.passwordEdit.text())
def sslErrors(self, reply, errors):
errorString = ", ".join([str(error.errorString()) for error in errors])
ret = QMessageBox.warning(self, "HTTP Example",
"One or more SSL errors has occurred: %s" % errorString,
QMessageBox.Ignore | QMessageBox.Abort)
if ret == QMessageBox.Ignore:
self.reply.ignoreSslErrors()
if __name__ == '__main__':
import sys
app = QApplication(sys.argv)
httpWin = HttpWindow()
httpWin.show()
sys.exit(httpWin.exec_())
