HyBi fallback when no numpy. Python 3 close fix.

- Use array module for unmasking HyBi when no numpy module is
  available.

- Detect client close properly when using python 3.

- Print request URL path is specified.

websocket.py

@@ -16,7 +16,8 @@ as taken from http://docs.python.org/dev/library/ssl.html#certificates
 
 '''
 
-import os, sys, time, errno, signal, socket, struct, traceback, select
+import os, sys, time, errno, signal, socket, traceback, select
+import struct, array
 from cgi import parse_qsl
 from base64 import b64encode, b64decode
 
@@ -28,6 +29,7 @@ if sys.hexversion > 0x3000000:
     from urllib.parse import urlsplit
     b2s = lambda buf: buf.decode('latin_1')
     s2b = lambda s: s.encode('latin_1')
+    s2a = lambda s: s
 else:
     # python 2.X
     from cStringIO import StringIO
@@ -36,6 +38,7 @@ else:
     # No-ops
     b2s = lambda buf: buf
     s2b = lambda s: s
+    s2a = lambda s: [ord(c) for c in s]
 
 if sys.hexversion >= 0x2060000:
     # python >= 2.6
@@ -54,7 +57,7 @@ for mod, sup in [('numpy', 'HyBi protocol'),
         globals()[mod] = __import__(mod)
     except ImportError:
         globals()[mod] = None
-        print("WARNING: no '%s' module, %s support disabled" % (
+        print("WARNING: no '%s' module, %s decode may be slower" % (
             mod, sup))
 
 
@@ -213,6 +216,38 @@ Sec-WebSocket-Accept: %s\r
         os.dup2(os.open(os.devnull, os.O_RDWR), sys.stdout.fileno())
         os.dup2(os.open(os.devnull, os.O_RDWR), sys.stderr.fileno())
 
+    @staticmethod
+    def unmask(buf, f):
+        pstart = f['hlen'] + 4
+        pend = pstart + f['length']
+        if numpy:
+            b = c = s2b('')
+            if f['length'] >= 4:
+                mask = numpy.frombuffer(buf, dtype=numpy.dtype('<u4'),
+                        offset=f['hlen'], count=1)
+                data = numpy.frombuffer(buf, dtype=numpy.dtype('<u4'),
+                        offset=pstart, count=int(f['length'] / 4))
+                #b = numpy.bitwise_xor(data, mask).data
+                b = numpy.bitwise_xor(data, mask).tostring()
+
+            if f['length'] % 4:
+                #print("Partial unmask")
+                mask = numpy.frombuffer(buf, dtype=numpy.dtype('B'),
+                        offset=f['hlen'], count=(f['length'] % 4))
+                data = numpy.frombuffer(buf, dtype=numpy.dtype('B'),
+                        offset=pend - (f['length'] % 4),
+                        count=(f['length'] % 4))
+                c = numpy.bitwise_xor(data, mask).tostring()
+            return b + c
+        else:
+            # Slower fallback
+            data = array.array('B')
+            mask = s2a(f['mask'])
+            data.fromstring(buf[pstart:pend])
+            for i in range(len(data)):
+                data[i] ^= mask[i % 4]
+            return data.tostring()
+
     @staticmethod
     def encode_hybi(buf, opcode, base64=False):
         """ Encode a HyBi style WebSocket frame.
@@ -301,24 +336,7 @@ Sec-WebSocket-Accept: %s\r
         if has_mask:
             # unmask payload
             f['mask'] = buf[f['hlen']:f['hlen']+4]
-            b = c = s2b('')
-            if f['length'] >= 4:
-                mask = numpy.frombuffer(buf, dtype=numpy.dtype('<u4'),
-                        offset=f['hlen'], count=1)
-                data = numpy.frombuffer(buf, dtype=numpy.dtype('<u4'),
-                        offset=f['hlen'] + 4, count=int(f['length'] / 4))
-                #b = numpy.bitwise_xor(data, mask).data
-                b = numpy.bitwise_xor(data, mask).tostring()
-
-            if f['length'] % 4:
-                #print("Partial unmask")
-                mask = numpy.frombuffer(buf, dtype=numpy.dtype('B'),
-                        offset=f['hlen'], count=(f['length'] % 4))
-                data = numpy.frombuffer(buf, dtype=numpy.dtype('B'),
-                        offset=full_len - (f['length'] % 4),
-                        count=(f['length'] % 4))
-                c = numpy.bitwise_xor(data, mask).tostring()
-            f['payload'] = b + c
+            f['payload'] = WebSocketServer.unmask(buf, f)
         else:
             print("Unmasked frame: %s" % repr(buf))
             f['payload'] = buf[(f['hlen'] + has_mask * 4):full_len]
@@ -474,11 +492,11 @@ Sec-WebSocket-Accept: %s\r
                         break
 
             else:
-                if buf[0:2] == '\xff\x00':
+                if buf[0:2] == s2b('\xff\x00'):
                     closed = "Client sent orderly close frame"
                     break
 
-                elif buf[0:2] == '\x00\xff':
+                elif buf[0:2] == s2b('\x00\xff'):
                     buf = buf[2:]
                     continue # No-op
 
@@ -617,9 +635,6 @@ Sec-WebSocket-Accept: %s\r
         if ver:
             # HyBi/IETF version of the protocol
 
-            if sys.hexversion < 0x2060000 or not numpy:
-                raise self.EClose("Python >= 2.6 and numpy module is required for HyBi-07 or greater")
-
             # HyBi-07 report version 7
             # HyBi-08 - HyBi-12 report version 8
             # HyBi-13 reports version 13
@@ -675,6 +690,9 @@ Sec-WebSocket-Accept: %s\r
         self.msg("%s: %s WebSocket connection" % (address[0], stype))
         self.msg("%s: Version %s, base64: '%s'" % (address[0],
             self.version, self.base64))
+        if self.path != '/':
+            self.msg("%s: Path: '%s'" % (address[0], self.path))
+
 
         # Send server WebSockets handshake response
         #self.msg("sending response [%s]" % response)