Issue 4374 - Made Python code part of jshydra comply with our coding practices

abp_rewrite.py

Index: abp_rewrite.py
===================================================================
--- a/abp_rewrite.py
+++ b/abp_rewrite.py
@@ -3,13 +3,81 @@
 # http://mozilla.org/MPL/2.0/.
 
 import os
+import platform
+import io
+import zipfile
 import subprocess
 
-import utils
+try:
+    from urllib.request import urlopen
+except ImportError:
+    import urllib2
+    import contextlib
+
+    def urlopen(*args, **kwargs):
+        return contextlib.closing(urllib2.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 = {
+    'Windows': 'win32',
+    'Linux': {
+        'i686': 'linux-i686',
+        'x86_64': 'linux-x86_64'
+    },
+    'Darwin': 'mac'
+}
+
+
+def ensure_jsshell():
+    path = os.environ.get('SPIDERMONKEY_BINARY')
+    if path and os.path.isfile(path):
+        return path
+
+    system = platform.system()
+    try:
+        build = JSSHELL_SUPPORTED_PLATFORMS[system]
+        if isinstance(build, dict):
+            build = build[platform.machine()]
+    except KeyError:
+        raise Exception('Platform {} ({}) not supported by JS shell'.format(
+            system, platform.machine()
+        ))
+
+    shell_dir = os.path.join(os.path.dirname(__file__),
+                             '{}-{}'.format(JSSHELL_DIR, build))
+    if not os.path.exists(shell_dir):
+        os.makedirs(shell_dir)
+    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 urlopen(JSSHELL_URL.format(build)) as response:
+        data = response.read()
+
+    with zipfile.ZipFile(io.BytesIO(data)) as archive:
+        archive.extractall(shell_dir)
+
+    if not os.path.exists(path):
+        raise Exception("Downloaded package doesn't contain JS shell")
+
+    try:
+        os.chmod(path, 0o700)
+    except:
+        pass
+
+    return path
 
 
 def rewrite_js(args, script=None):
-    jsshell = utils.ensureJSShell()
+    jsshell = ensure_jsshell()
     env = {'LD_LIBRARY_PATH': os.path.relpath(os.path.dirname(jsshell))}
     base_dir = os.path.dirname(__file__)