Voting part 2

dosagelib/configuration.py

@@ -24,4 +24,4 @@ Freeware = AppName+u""" comes with ABSOLUTELY NO WARRANTY!
 This is free software, and you are welcome to redistribute it
 under certain conditions. Look at the file `COPYING' within this
 distribution."""
-
+VoteUrl = "XXX"

dosagelib/scraper.py

@@ -3,8 +3,9 @@
 # Copyright (C) 2012-2013 Bastian Kleineidam
 import requests
 import time
-from . import loader
+from . import loader, configuration
-from .util import fetchUrl, fetchUrls, getPageContent, makeSequence
+from .util import (fetchUrl, fetchUrls, getPageContent, makeSequence,
+  get_system_uid, urlopen)
 from .comic import ComicStrip
 from .output import out
 from .events import getHandler
@@ -226,7 +227,13 @@ class _BasicScraper(object):
 
     def vote(self):
         """Cast a public vote for this comic."""
-        pass # XXX
+        url = configuration.VoteUrl
+        uid = get_system_uid()
+        data = {"comic": self.getName(), "uid": uid}
+        page = urlopen(url, self.session, data=data, stream=False)
+        answer = page.text
+        if "voted" not in answer:
+            raise ValueError("vote error %r" % answer)
 
 
 def find_scraperclasses(comic, multiple_allowed=False):

dosagelib/util.py

@@ -21,6 +21,7 @@ import cgi
 import re
 import traceback
 import time
+import subprocess
 try:
     from HTMLParser import HTMLParser
 except ImportError:
@@ -59,6 +60,62 @@ if hasattr(requests, 'adapters'):
     requests.adapters.DEFAULT_RETRIES = MaxRetries
 
 
+def get_system_uid():
+    """Get a (probably) unique ID to identify a system.
+    Used to differentiate votes.
+    """
+    try:
+        if os.name == 'nt':
+            return get_nt_system_uid()
+        if sys.platform == 'darwin':
+            return get_osx_system_uid()
+    except Exception:
+        return get_mac_uid()
+    else:
+        return get_mac_uid()
+
+
+def get_nt_system_uid():
+    """Get the MachineGuid from
+    HKEY_LOCAL_MACHINE\Software\Microsoft\Cryptography\MachineGuid
+    """
+    try:
+        import _winreg as winreg
+    except ImportError:
+        import winreg
+    lm = winreg.ConnectRegistry(None, winreg.HKEY_LOCAL_MACHINE)
+    try:
+        key = winreg.OpenKey(lm, r"Software\Microsoft\Cryptography")
+        try:
+            return winreg.QueryValueEx(key, "MachineGuid")[0]
+        finally:
+            key.Close()
+    finally:
+        lm.Close()
+
+
+def get_osx_system_uid():
+    """Get the OSX system ID.
+    $ system_profiler |grep "r (system)"
+    Serial Number (system): C24E1322XXXX
+    """
+    res = backtick(["system_profile"]).splitlines()
+    for line in res:
+        if "r (system)" in line:
+            return line.split(':', 1)[1].strip()
+    raise ValueError("Could not find system number in %r" % res)
+
+
+def get_mac_uid():
+    """Get the MAC address of the system."""
+    import uuid
+    return uuid.getnode()
+
+
+def backtick (cmd, encoding='utf-8'):
+    """Return decoded output from command."""
+    data = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()[0]
+    return data.decode(encoding)
 def unicode_safe(text, encoding=UrlEncoding, errors='ignore'):
     """Decode text to Unicode if not already done."""
     try:

tests/test_util.py

@@ -4,7 +4,7 @@
 import re
 from unittest import TestCase
 
-from dosagelib.util import normaliseURL, unescape, tagre
+from dosagelib.util import normaliseURL, unescape, tagre, get_system_uid
 
 
 class URLTest(TestCase):
@@ -50,3 +50,12 @@ class RegexTest(TestCase):
             self.assertEqual(match.group(1), value)
         else:
             self.assertFalse(match, "%s should not match %s" % (matcher.pattern, text))
+
+
+class UidTest(TestCase):
+    """
+    Tests for unique system IDs.
+    """
+
+    def test_system_uid(self):
+        self.assertTrue(get_system_uid())