Issue 4373 - Made jshydra compatible with Python 3

utils.py

-# coding: utf-8
-
 # This Source Code is subject to the terms of the Mozilla Public License
 # version 2.0 (the "License"). You can obtain a copy of the License at
 # http://mozilla.org/MPL/2.0/.
 
-from contextlib import closing
 import os
 import platform
-from StringIO import StringIO
-import sys
-import urllib
+import io
 import zipfile
 
-JSSHELL_DIR = "mozilla-esr31"
-JSSHELL_URL = ("https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly"
-               "/2015/02/2015-02-25-00-22-19-%s/jsshell-%%s.zip" % JSSHELL_DIR)
+try:
+    from urllib.request import urlopen
+except ImportError:
+    import urllib
+    import contextlib
+
+    def urlopen(*args, **kwargs):
+        return contextlib.closing(urllib.urlopen(*args, **kwargs))
+
+JSSHELL_DIR = 'mozilla-esr31'
+JSSHELL_URL = ('https://ftp.mozilla.org/pub/mozilla.org/firefox/nightly'
+               '/2015/02/2015-02-25-00-22-19-{}'
+               '/jsshell-{{}}.zip'.format(JSSHELL_DIR))
 
 JSSHELL_SUPPORTED_PLATFORMS = {
-    "win32": "win32",
-    "linux2": {
-        "i686": "linux-i686",
-        "x86_64": "linux-x86_64"
+    'Windows': 'win32',
+    'Linux': {
+        'i686': 'linux-i686',
+        'x86_64': 'linux-x86_64'
     },
-    "darwin": "mac"
+    'Darwin': 'mac'
 }
 
 
 def ensureJSShell():
     path = os.environ.get('SPIDERMONKEY_BINARY')
     if path and os.path.isfile(path):
         return path
 
     baseDir = os.path.dirname(__file__)
+    system = platform.system()

[Sebastian Noack, 2016/08/28 22:36:14]

sys.platform behaves inconsistently since Python 3.3 and before. The value for
Linux changed from 'linux2' to 'linux'. However, platform.system() isn't
effected and can be used instead, without any compatibility hack.

[Vasily Kuznetsov, 2016/08/29 15:29:52]

Acknowledged.

 
     try:
-        build = JSSHELL_SUPPORTED_PLATFORMS[sys.platform]
+        build = JSSHELL_SUPPORTED_PLATFORMS[system]
         if isinstance(build, dict):
             build = build[platform.machine()]
     except KeyError:
-        raise Exception('Platform %s (%s) not supported by JS shell' % (
-            sys.platform, platform.machine()
+        raise Exception('Platform {} ({}) not supported by JS shell'.format(
+            system, platform.machine()
         ))
 
     shell_dir = os.path.join(baseDir, JSSHELL_DIR + "-" + build)
     if not os.path.exists(shell_dir):
         os.makedirs(shell_dir)
-    if sys.platform == 'win32':
+    if system == 'Windows':
         path = os.path.join(shell_dir, 'js.exe')
     else:
         path = os.path.join(shell_dir, 'js')
 
     if os.path.exists(path):
         return path
 
-    with closing(urllib.urlopen(JSSHELL_URL % build)) as response:
+    with urlopen(JSSHELL_URL.format(build)) as response:
         data = response.read()
 
-    with zipfile.ZipFile(StringIO(data)) as zip:
-        zip.extractall(shell_dir)
+    with zipfile.ZipFile(io.BytesIO(data)) as archive:
+        archive.extractall(shell_dir)
 
     if not os.path.exists(path):
         raise Exception('Downloaded package didn\'t contain JS shell executable')
 
     try:
-        os.chmod(path, 0700)
+        os.chmod(path, 0o700)
     except:
         pass
 
     return path