207 lines
6.6 KiB
Python
207 lines
6.6 KiB
Python
#!/usr/bin/python3
|
|
|
|
"""
|
|
# phantom.py
|
|
|
|
Simple but fully scriptable headless QtWebKit browser using PyQt5 in Python3,
|
|
specialized in executing external JavaScript and generating PDF files. A lean
|
|
replacement for other bulky headless browser frameworks.
|
|
|
|
|
|
## Usage
|
|
|
|
If you have a display attached:
|
|
|
|
./phantom.py <url> <pdf-file> [<javascript-file>]
|
|
|
|
If you don't have a display attached (i.e. on a remote server):
|
|
|
|
xvfb-run ./phantom.py <url> <pdf-file> [<javascript-file>]
|
|
|
|
Arguments:
|
|
|
|
<url> Can be a http(s) URL or a path to a local file
|
|
<pdf-file> Path and name of PDF file to generate
|
|
[<javascript-file>] (optional) Path and name of a JavaScript file to execute
|
|
|
|
|
|
## Features
|
|
|
|
* Generate a PDF screenshot of the web page after it is completely loaded.
|
|
* Optionally execute a local JavaScript file specified by the argument
|
|
<javascript-file> after the web page is completely loaded, and before
|
|
the PDF is generated.
|
|
* console.log's will be printed to stdout.
|
|
* Easily add new features by changing the source code of this script, without
|
|
compiling C++ code. For more advanced applications, consider attaching
|
|
PyQt objects/methods to WebKit's JavaScript space by using
|
|
`QWebFrame::addToJavaScriptWindowObject()`.
|
|
|
|
If you execute an external <javascript-file>, phantom.py has no way of knowing
|
|
when that script has finished doing its work. For this reason, the external
|
|
script should execute `console.log("__PHANTOM_PY_DONE__");` when done. This will
|
|
trigger the PDF generation, after which phantom.py will exit. If no
|
|
`__PHANTOM_PY_DONE__` string is seen on the console for 10 seconds, phantom.py
|
|
will exit without doing anything. This behavior could be implemented more
|
|
elegantly without console.log's but it is the simplest solution.
|
|
|
|
It is important to remember that since you're just running WebKit, you can use
|
|
everything that WebKit supports, including the usual JS client libraries, CSS,
|
|
CSS @media types, etc.
|
|
|
|
|
|
## Dependencies
|
|
|
|
* Python3
|
|
* PyQt5
|
|
* xvfb (optional for display-less machines)
|
|
|
|
Installation of dependencies in Debian Stretch is easy:
|
|
|
|
apt-get install xvfb python3-pyqt5 python3-pyqt5.qtwebkit
|
|
|
|
Finding the equivalent for other OSes is an exercise that I leave to you.
|
|
|
|
|
|
## Examples
|
|
|
|
Given the following file /tmp/test.html
|
|
|
|
<html>
|
|
<body>
|
|
<p>foo <span id="id1">foo</span> <span id="id2">foo</span></p>
|
|
</body>
|
|
<script>
|
|
document.getElementById('id1').innerHTML = "bar";
|
|
</script>
|
|
</html>
|
|
|
|
... and the following file /tmp/test.js:
|
|
|
|
document.getElementById('id2').innerHTML = "baz";
|
|
console.log("__PHANTOM_PY_DONE__");
|
|
|
|
... and running this script (without attached display) ...
|
|
|
|
xvfb-run python3 phantom.py /tmp/test.html /tmp/out.pdf /tmp/test.js
|
|
|
|
... you will get a PDF file /tmp/out.pdf with the contents "foo bar baz".
|
|
|
|
Note that the second occurrence of "foo" has been replaced by the web page's own
|
|
script, and the third occurrence of "foo" by the external JS file.
|
|
|
|
|
|
## License
|
|
|
|
Copyright 2017 Michael Karl Franzl
|
|
|
|
Permission is hereby granted, free of charge, to any person obtaining a copy of
|
|
this software and associated documentation files (the "Software"), to deal in
|
|
the Software without restriction, including without limitation the rights to
|
|
use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
|
|
of the Software, and to permit persons to whom the Software is furnished to do
|
|
so, subject to the following conditions:
|
|
|
|
The above copyright notice and this permission notice shall be included in all
|
|
copies or substantial portions of the Software.
|
|
|
|
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
|
|
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
|
|
FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
|
|
COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
|
|
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
|
"""
|
|
|
|
import sys
|
|
from PyQt5.QtCore import QUrl
|
|
from PyQt5.QtWebKitWidgets import QWebPage
|
|
from PyQt5.QtWidgets import QApplication
|
|
from PyQt5.QtPrintSupport import QPrinter
|
|
from PyQt5.QtCore import QTimer
|
|
import traceback
|
|
|
|
|
|
class Render(QWebPage):
|
|
def __init__(self, url, outfile, jsfile):
|
|
self.app = QApplication(sys.argv)
|
|
|
|
QWebPage.__init__(self)
|
|
|
|
self.jsfile = jsfile
|
|
self.outfile = outfile
|
|
|
|
qurl = QUrl.fromUserInput(url)
|
|
|
|
print("phantom.py: URL=", qurl, "OUTFILE=", outfile, "JSFILE=", jsfile)
|
|
|
|
# The PDF generation only happens when the special string __PHANTOM_PY_DONE__
|
|
# is sent to console.log(). The following JS string will be executed by
|
|
# default, when no external JavaScript file is specified.
|
|
self.js_contents = "setTimeout(function() { console.log('__PHANTOM_PY_DONE__') }, 500);";
|
|
|
|
if jsfile:
|
|
try:
|
|
f = open(self.jsfile)
|
|
self.js_contents = f.read()
|
|
f.close()
|
|
except:
|
|
print(traceback.format_exc())
|
|
self._exit(10)
|
|
|
|
self.loadFinished.connect(self._loadFinished)
|
|
self.mainFrame().load(qurl)
|
|
self.javaScriptConsoleMessage = self._onConsoleMessage
|
|
|
|
# Run for a maximum of 10 seconds
|
|
watchdog = QTimer()
|
|
watchdog.setSingleShot(True)
|
|
watchdog.timeout.connect(lambda: self._exit(1))
|
|
watchdog.start(10000)
|
|
|
|
self.app.exec_()
|
|
|
|
|
|
def _onConsoleMessage(self, txt, lineno, filename):
|
|
print("CONSOLE", lineno, txt, filename)
|
|
if "__PHANTOM_PY_DONE__" in txt:
|
|
# If we get this magic string, it means that the external JS is done
|
|
self._print()
|
|
self._exit(0)
|
|
|
|
|
|
def _loadFinished(self, result):
|
|
print("phantom.py: Loading finished!")
|
|
print("phantom.py: Evaluating JS from", self.jsfile)
|
|
self.frame = self.mainFrame()
|
|
self.frame.evaluateJavaScript(self.js_contents)
|
|
|
|
|
|
def _print(self):
|
|
print("phantom.py: Printing...")
|
|
printer = QPrinter()
|
|
printer.setPageMargins(10, 10, 10, 10, QPrinter.Millimeter)
|
|
printer.setPaperSize(QPrinter.A4)
|
|
printer.setCreator("phantom.py by Michael Karl Franzl")
|
|
printer.setOutputFormat(QPrinter.PdfFormat);
|
|
printer.setOutputFileName(self.outfile);
|
|
self.frame.print(printer)
|
|
|
|
def _exit(self, val):
|
|
print("phantom.py: Exiting with val", val)
|
|
self.app.exit(val) # Qt exit
|
|
exit(val) # Python exit
|
|
|
|
|
|
def main():
|
|
if (len(sys.argv) < 3):
|
|
print("USAGE: ./phantom.py <url> <pdf-file> [<javascript-file>]")
|
|
else:
|
|
url = sys.argv[1]
|
|
outfile = sys.argv[2]
|
|
jsfile = sys.argv[3] if len(sys.argv) > 3 else None
|
|
r = Render(url, outfile, jsfile)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
main() |