Add IPv6 support.

Authored by mordervomubel ( https://github.com/mordervomubel )
GitHub issue webpy/webpy webpy#70

web/net.py

@@ -4,7 +4,7 @@
 """
 
 __all__ = [
-  "validipaddr", "validipport", "validip", "validaddr", 
+  "validipaddr", "validip6addr", "validipport", "validip", "validaddr",
   "urlquote",
   "httpdate", "parsehttpdate", 
   "htmlquote", "htmlunquote", "websafe",
@@ -13,6 +13,28 @@
 import urllib, time
 try: import datetime
 except ImportError: pass
+import re
+import socket
+
+def validip6addr(address):
+    """
+    Returns True if `address` is a valid IPv6 address.
+
+        >>> validip6addr('::')
+        True
+        >>> validip6addr('aaaa:bbbb:cccc:dddd::1')
+        True
+        >>> validip6addr('1:2:3:4:5:6:7:8:9:10')
+        False
+        >>> validip6addr('12:10')
+        False
+    """
+    try:
+        socket.inet_pton(socket.AF_INET6, address)
+    except socket.error:
+        return False
+
+    return True
 
 def validipaddr(address):
     """
@@ -59,6 +81,18 @@ def validip(ip, defaultaddr="0.0.0.0", defaultport=8080):
     addr = defaultaddr
     port = defaultport
 
+    #Matt Boswell's code to check for ipv6 first
+    match = re.search(r'^\[([^]]+)\](?::(\d+))?$',ip) #check for [ipv6]:port
+    if match:
+        if validip6addr(match.group(1)):
+            if match.group(2):
+                if validipport(match.group(2)): return (match.group(1),int(match.group(2)))
+            else:
+                return (match.group(1),port)
+    else:
+        if validip6addr(ip): return (ip,port)
+    #end ipv6 code
+
     ip = ip.split(":", 1)
     if len(ip) == 1:
         if not ip[0]: