Merge remote-tracking branch 'origin/master'

sanic/ip.py

@@ -0,0 +1,69 @@
+import socket
+
+# CAPS R OK BCUZ WE HAZ CIDict
+HEADER_PRECEDENCE_ORDER = (
+    'X_FORWARDED_FOR',
+    'CLIENT_IP',
+    'X_REAL_IP',
+    'X_FORWARDED',
+    'X_CLUSTER_CLIENT_IP',
+    'FORWARDED_FOR',
+    'FORWARDED',
+    'VIA',
+    'REMOTE_ADDR',
+)
+
+# Private IP addresses
+# http://en.wikipedia.org/wiki/List_of_assigned_/8_IPv4_address_blocks
+# http://www.ietf.org/rfc/rfc3330.txt (IPv4)
+# http://www.ietf.org/rfc/rfc5156.txt (IPv6)
+# Regex would be ideal here, but this is keeping it simple
+PRIVATE_IP_PREFIX = (
+    '0.',  # externally non-routable
+    '10.',  # class A private block
+    '169.254.',  # link-local block
+    '172.16.', '172.17.', '172.18.', '172.19.',
+    '172.20.', '172.21.', '172.22.', '172.23.',
+    '172.24.', '172.25.', '172.26.', '172.27.',
+    '172.28.', '172.29.', '172.30.', '172.31.',  # class B private blocks
+    '192.0.2.',  # reserved for documentation and example code
+    '192.168.',  # class C private block
+    '255.255.255.',  # IPv4 broadcast address
+    '2001:db8:',  # reserved for documentation and example code
+    'fc00:',  # IPv6 private block
+    'fe80:',  # link-local unicast
+    'ff00:',  # IPv6 multicast
+)
+
+LOOPBACK_PREFIX = (
+    '127.',  # IPv4 loopback device
+    '::1',  # IPv6 loopback device
+)
+
+NON_PUBLIC_IP_PREFIX = PRIVATE_IP_PREFIX + LOOPBACK_PREFIX
+
+
+def is_valid_ipv4(ip_str):
+    try:
+        socket.inet_pton(socket.AF_INET, ip_str)
+    except AttributeError:  # pragma: no cover
+        try:  # Fall-back on legacy API or False
+            socket.inet_aton(ip_str)
+        except (AttributeError, socket.error):
+            return False
+        return ip_str.count('.') == 3
+    except socket.error:
+        return False
+    return True
+
+
+def is_valid_ipv6(ip_str):
+    try:
+        socket.inet_pton(socket.AF_INET6, ip_str)
+    except socket.error:
+        return False
+    return True
+
+
+def is_valid_ip(ip_str):
+    return is_valid_ipv4(ip_str) or is_valid_ipv6(ip_str)

sanic/request.py

@@ -5,6 +5,7 @@ from collections import namedtuple
 from http.cookies import SimpleCookie
 from httptools import parse_url
 from urllib.parse import parse_qs, urlunparse
+from .ip import is_valid_ip, HEADER_PRECEDENCE_ORDER, NON_PUBLIC_IP_PREFIX
 
 try:
     from ujson import loads as json_loads
@@ -168,8 +169,14 @@ class Request(dict):
     @property
     def ip(self):
         if not hasattr(self, '_ip'):
-            self._ip = (self.transport.get_extra_info('peername') or
-                        (None, None))
+            self._ip = None
+            for key in HEADER_PRECEDENCE_ORDER:
+                value = self.headers.get(key, self.headers.get(key.replace('_', '-'), '')).strip()
+                if value is not None and value != '':
+                    for ip_str in [ip.strip().lower() for ip in value.split(',')]:
+                        if ip_str and is_valid_ip(ip_str):
+                            if not ip_str.startswith(NON_PUBLIC_IP_PREFIX):
+                                self._ip = ip_str
         return self._ip
 
     @property