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#!/usr/bin/env python
"""PyQt4 port of the network/http example from Qt v4.x"""
# This is only needed for Python v2 but is harmless for Python v3.
import sip
sip.setapi('QString', 2)
from PyQt4 import QtCore, QtGui, QtNetwork
class HttpWindow(QtGui.QDialog):
def __init__(self, parent=None):
super(HttpWindow, self).__init__(parent)
self.outFile = None
self.httpGetId = 0
self.httpRequestAborted = False
self.urlLineEdit = QtGui.QLineEdit('https://')
urlLabel = QtGui.QLabel("&URL:")
urlLabel.setBuddy(self.urlLineEdit)
self.statusLabel = QtGui.QLabel("Please enter the URL of a file you "
"want to download.")
self.downloadButton = QtGui.QPushButton("Download")
self.downloadButton.setDefault(True)
self.quitButton = QtGui.QPushButton("Quit")
self.quitButton.setAutoDefault(False)
buttonBox = QtGui.QDialogButtonBox()
buttonBox.addButton(self.downloadButton,
QtGui.QDialogButtonBox.ActionRole)
buttonBox.addButton(self.quitButton, QtGui.QDialogButtonBox.RejectRole)
self.progressDialog = QtGui.QProgressDialog(self)
self.http = QtNetwork.QHttp(self)
self.urlLineEdit.textChanged.connect(self.enableDownloadButton)
self.http.requestFinished.connect(self.httpRequestFinished)
self.http.dataReadProgress.connect(self.updateDataReadProgress)
self.http.responseHeaderReceived.connect(self.readResponseHeader)
self.http.authenticationRequired.connect(self.slotAuthenticationRequired)
self.http.sslErrors.connect(self.sslErrors)
self.progressDialog.canceled.connect(self.cancelDownload)
self.downloadButton.clicked.connect(self.downloadFile)
self.quitButton.clicked.connect(self.close)
topLayout = QtGui.QHBoxLayout()
topLayout.addWidget(urlLabel)
topLayout.addWidget(self.urlLineEdit)
mainLayout = QtGui.QVBoxLayout()
mainLayout.addLayout(topLayout)
mainLayout.addWidget(self.statusLabel)
mainLayout.addWidget(buttonBox)
self.setLayout(mainLayout)
self.setWindowTitle("HTTP")
self.urlLineEdit.setFocus()
def downloadFile(self):
url = QtCore.QUrl(self.urlLineEdit.text())
fileInfo = QtCore.QFileInfo(url.path())
fileName = fileInfo.fileName()
if not fileName:
fileName = 'index.html'
if QtCore.QFile.exists(fileName):
ret = QtGui.QMessageBox.question(self, "HTTP",
"There already exists a file called %s in the current "
"directory." % fileName,
QtGui.QMessageBox.Ok | QtGui.QMessageBox.Cancel,
QtGui.QMessageBox.Cancel)
if ret == QtGui.QMessageBox.Cancel:
return
QtCore.QFile.remove(fileName)
self.outFile = QtCore.QFile(fileName)
if not self.outFile.open(QtCore.QIODevice.WriteOnly):
QtGui.QMessageBox.information(self, "HTTP",
"Unable to save the file %s: %s." % (fileName, self.outFile.errorString()))
self.outFile = None
return
if url.scheme().lower() == 'https':
mode = QtNetwork.QHttp.ConnectionModeHttps
else:
mode = QtNetwork.QHttp.ConnectionModeHttp
port = url.port()
if port == -1:
port = 0
self.http.setHost(url.host(), mode, port)
if url.userName():
self.http.setUser(url.userName(), url.password())
self.httpRequestAborted = False
path = QtCore.QUrl.toPercentEncoding(url.path(), "!$&'()*+,;=:@/")
if path:
try:
# Python v3.
path = str(path, encoding='utf-8')
except TypeError:
# Python v2.
path = str(path)
else:
path = '/'
self.httpGetId = self.http.get(path, self.outFile)
self.progressDialog.setWindowTitle("HTTP")
self.progressDialog.setLabelText("Downloading %s." % fileName)
self.downloadButton.setEnabled(False)
def cancelDownload(self):
self.statusLabel.setText("Download canceled.")
self.httpRequestAborted = True
self.http.abort()
self.downloadButton.setEnabled(True)
def httpRequestFinished(self, requestId, error):
if requestId != self.httpGetId:
return
if self.httpRequestAborted:
if self.outFile is not None:
self.outFile.close()
self.outFile.remove()
self.outFile = None
self.progressDialog.hide()
return
self.progressDialog.hide()
self.outFile.close()
if error:
self.outFile.remove()
QtGui.QMessageBox.information(self, "HTTP",
"Download failed: %s." % self.http.errorString())
else:
fileName = QtCore.QFileInfo(QtCore.QUrl(self.urlLineEdit.text()).path()).fileName()
self.statusLabel.setText("Downloaded %s to current directory." % fileName)
self.downloadButton.setEnabled(True)
self.outFile = None
def readResponseHeader(self, responseHeader):
# Check for genuine error conditions.
if responseHeader.statusCode() not in (200, 300, 301, 302, 303, 307):
QtGui.QMessageBox.information(self, "HTTP",
"Download failed: %s." % responseHeader.reasonPhrase())
self.httpRequestAborted = True
self.progressDialog.hide()
self.http.abort()
def updateDataReadProgress(self, bytesRead, totalBytes):
if self.httpRequestAborted:
return
self.progressDialog.setMaximum(totalBytes)
self.progressDialog.setValue(bytesRead)
def enableDownloadButton(self):
self.downloadButton.setEnabled(bool(self.urlLineEdit.text()))
def slotAuthenticationRequired(self, hostName, _, authenticator):
import os
from PyQt4 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(), hostName))
if dlg.exec_() == QtGui.QDialog.Accepted:
authenticator.setUser(dlg.userEdit.text())
authenticator.setPassword(dlg.passwordEdit.text())
def sslErrors(self, errors):
errorString = ", ".join([str(error.errorString()) for error in errors])
ret = QtGui.QMessageBox.warning(self, "HTTP Example",
"One or more SSL errors has occurred: %s" % errorString,
QtGui.QMessageBox.Ignore | QtGui.QMessageBox.Abort)
if ret == QtGui.QMessageBox.Ignore:
self.http.ignoreSslErrors()
if __name__ == '__main__':
import sys
app = QtGui.QApplication(sys.argv)
httpWin = HttpWindow()
httpWin.show()
sys.exit(httpWin.exec_())
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