#!/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://www.qt.io') 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 if self.reply is not None: 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) 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_())