WebBrowser/Network/QtHelpSchemeHandler.py

Sun, 03 Feb 2019 16:10:39 +0100

author
Detlev Offenbach <detlev@die-offenbachs.de>
date
Sun, 03 Feb 2019 16:10:39 +0100
changeset 6695
0a51887c13cd
parent 6645
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child 6646
51eefa621de4
permissions
-rw-r--r--

Web Browser (NG):
- added a site info widget that is show when the site icon in the URL entry is clicked
- added code to register custom protocol handlers (upon request of the user via the site info widget)

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1 # -*- coding: utf-8 -*-
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2
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3 # Copyright (c) 2009 - 2019 Detlev Offenbach <detlev@die-offenbachs.de>
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4 #
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5
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6 """
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7 Module implementing a scheme access handler for QtHelp.
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8 """
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9
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10 from __future__ import unicode_literals
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11
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12 import mimetypes
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13 import os
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14
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15 from PyQt5.QtCore import pyqtSignal, QByteArray, QIODevice, QBuffer, QMutex, \
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16 QMutexLocker
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17 from PyQt5.QtWebEngineCore import QWebEngineUrlSchemeHandler, \
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18 QWebEngineUrlRequestJob
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19
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20 QtDocPath = "qthelp://org.qt-project."
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21
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22 ExtensionMap = {
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23 ".bmp": "image/bmp",
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24 ".css": "text/css",
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25 ".gif": "image/gif",
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26 ".html": "text/html",
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27 ".htm": "text/html",
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28 ".ico": "image/x-icon",
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29 ".jpeg": "image/jpeg",
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30 ".jpg": "image/jpeg",
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31 ".js": "application/x-javascript",
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32 ".mng": "video/x-mng",
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33 ".pbm": "image/x-portable-bitmap",
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34 ".pgm": "image/x-portable-graymap",
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35 ".pdf": "application/pdf",
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36 ".png": "image/png",
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37 ".ppm": "image/x-portable-pixmap",
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38 ".rss": "application/rss+xml",
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39 ".svg": "image/svg+xml",
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40 ".svgz": "image/svg+xml",
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41 ".text": "text/plain",
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42 ".tif": "image/tiff",
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43 ".tiff": "image/tiff",
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44 ".txt": "text/plain",
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45 ".xbm": "image/x-xbitmap",
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46 ".xml": "text/xml",
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47 ".xpm": "image/x-xpm",
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48 ".xsl": "text/xsl",
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49 ".xhtml": "application/xhtml+xml",
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50 ".wml": "text/vnd.wap.wml",
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51 ".wmlc": "application/vnd.wap.wmlc",
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52 }
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53
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54
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55 class QtHelpSchemeHandler(QWebEngineUrlSchemeHandler):
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56 """
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57 Class implementing a scheme handler for the qthelp: scheme.
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58 """
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59 def __init__(self, engine, parent=None):
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60 """
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61 Constructor
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62
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63 @param engine reference to the help engine
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64 @type QHelpEngine
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65 @param parent reference to the parent object
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66 @type QObject
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67 """
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68 super(QtHelpSchemeHandler, self).__init__(parent)
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69
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70 self.__engine = engine
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71
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72 self.__replies = []
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73
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74 def requestStarted(self, job):
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75 """
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76 Public method handling the URL request.
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77
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78 @param job URL request job
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79 @type QWebEngineUrlRequestJob
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80 """
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81 if job.requestUrl().scheme() == "qthelp":
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82 reply = QtHelpSchemeReply(job, self.__engine)
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83 reply.closed.connect(lambda: self.__replyClosed(reply))
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84 self.__replies.append(reply)
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85 job.reply(reply.mimeType(), reply)
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86 else:
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87 job.fail(QWebEngineUrlRequestJob.UrlInvalid)
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88
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89 def __replyClosed(self, reply):
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90 """
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91 Private slot handling the closed signal of a reply.
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92
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93 @param reply reference to the network reply
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94 @type QtHelpSchemeReply
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95 """
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96 if reply in self.__replies:
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97 self.__replies.remove(reply)
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98
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99
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100 class QtHelpSchemeReply(QIODevice):
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101 """
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102 Class implementing a reply for a requested qthelp: page.
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103
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104 @signal closed emitted to signal that the web engine has read
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105 the data
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106 """
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107 closed = pyqtSignal()
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108
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109 def __init__(self, job, engine, parent=None):
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110 """
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111 Constructor
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112
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113 @param job reference to the URL request
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114 @type QWebEngineUrlRequestJob
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115 @param engine reference to the help engine
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116 @type QHelpEngine
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117 @param parent reference to the parent object
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118 @type QObject
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119 """
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120 super(QtHelpSchemeReply, self).__init__(parent)
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121
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122 self.__job = job
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123 self.__engine = engine
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124 self.__mutex = QMutex()
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125
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126 self.__buffer = QBuffer()
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127
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128 # determine mimetype
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129 url = self.__job.requestUrl()
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130 strUrl = url.toString()
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131
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132 # For some reason the url to load maybe wrong (passed from web engine)
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133 # though the css file and the references inside should work that way.
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134 # One possible problem might be that the css is loaded at the same
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135 # level as the html, thus a path inside the css like
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136 # (../images/foo.png) might cd out of the virtual folder
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137 if not self.__engine.findFile(url).isValid():
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138 if strUrl.startswith(QtDocPath):
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139 newUrl = self.__job.requestUrl()
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140 if not newUrl.path().startswith("/qdoc/"):
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141 newUrl.setPath("/qdoc" + newUrl.path())
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142 url = newUrl
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143 strUrl = url.toString()
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144
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145 self.__mimeType = mimetypes.guess_type(strUrl)[0]
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146 if self.__mimeType is None:
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147 # do our own (limited) guessing
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148 self.__mimeType = self.__mimeFromUrl(url)
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149
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150 self.__loadQtHelpPage(url)
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151
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152 def __loadQtHelpPage(self, url):
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153 """
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154 Private method to load the requested QtHelp page.
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155
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156 @param url URL of the requested page
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157 @type QUrl
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158 """
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159 if self.__engine.findFile(url).isValid():
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160 data = self.__engine.fileData(url)
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161 else:
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162 data = QByteArray(self.tr(
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163 """<html>"""
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164 """<head><title>Error 404...</title></head>"""
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165 """<body><div align="center"><br><br>"""
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166 """<h1>The page could not be found</h1><br>"""
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167 """<h3>'{0}'</h3></div></body>"""
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168 """</html>""").format(url.toString())
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169 .encode("utf-8"))
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170
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171 lock = QMutexLocker(self.__mutex)
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172 self.__buffer.setData(data)
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173 self.__buffer.open(QIODevice.ReadOnly)
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174 self.open(QIODevice.ReadOnly)
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175 lock.unlock()
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176
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177 self.readyRead.emit()
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178
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179 def bytesAvailable(self):
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180 """
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181 Public method to get the number of available bytes.
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182
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183 @return number of available bytes
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184 @rtype int
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185 """
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186 lock = QMutexLocker(self.__mutex) # __IGNORE_WARNING__
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187 return self.__buffer.bytesAvailable()
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188
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189 def readData(self, maxlen):
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190 """
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191 Public method to retrieve data from the reply object.
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192
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193 @param maxlen maximum number of bytes to read (integer)
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194 @return string containing the data (bytes)
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195 """
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196 lock = QMutexLocker(self.__mutex) # __IGNORE_WARNING__
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197 return self.__buffer.read(maxlen)
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198
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199 def close(self):
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200 """
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201 Public method used to cloase the reply.
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202 """
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203 super(QtHelpSchemeReply, self).close()
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204 self.closed.emit()
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205
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206 def __mimeFromUrl(self, url):
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207 """
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208 Private method to guess the mime type given an URL.
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209
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210 @param url URL to guess the mime type from (QUrl)
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211 @return mime type for the given URL (string)
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212 """
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213 path = url.path()
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214 ext = os.path.splitext(path)[1].lower()
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215 if ext in ExtensionMap:
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216 return ExtensionMap[ext]
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217 else:
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218 return "application/octet-stream"
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219
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220 def mimeType(self):
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221 """
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222 Public method to get the reply mime type.
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223
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224 @return mime type of the reply
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225 @rtype bytes
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226 """
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227 return self.__mimeType.encode("utf-8")

eric ide

mercurial