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gae.py
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gae.py
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#!/usr/bin/env python
# coding:utf-8
__version__ = '3.2.0'
__password__ = ''
__hostsdeny__ = () # __hostsdeny__ = ('.youtube.com', '.youku.com')
import os
import re
import time
import struct
import zlib
import base64
import logging
import urlparse
import httplib
import io
import string
from google.appengine.api import urlfetch
from google.appengine.api.taskqueue.taskqueue import MAX_URL_LENGTH
from google.appengine.runtime import apiproxy_errors
URLFETCH_MAX = 2
URLFETCH_MAXSIZE = 4*1024*1024
URLFETCH_DEFLATE_MAXSIZE = 4*1024*1024
URLFETCH_TIMEOUT = 30
def message_html(title, banner, detail=''):
MESSAGE_TEMPLATE = '''
<html><head>
<meta http-equiv="content-type" content="text/html;charset=utf-8">
<title>$title</title>
<style><!--
body {font-family: arial,sans-serif}
div.nav {margin-top: 1ex}
div.nav A {font-size: 10pt; font-family: arial,sans-serif}
span.nav {font-size: 10pt; font-family: arial,sans-serif; font-weight: bold}
div.nav A,span.big {font-size: 12pt; color: #0000cc}
div.nav A {font-size: 10pt; color: black}
A.l:link {color: #6f6f6f}
A.u:link {color: green}
//--></style>
</head>
<body text=#000000 bgcolor=#ffffff>
<table border=0 cellpadding=2 cellspacing=0 width=100%>
<tr><td bgcolor=#3366cc><font face=arial,sans-serif color=#ffffff><b>Message From FetchServer</b></td></tr>
<tr><td> </td></tr></table>
<blockquote>
<H1>$banner</H1>
$detail
<p>
</blockquote>
<table width=100% cellpadding=0 cellspacing=0><tr><td bgcolor=#3366cc><img alt="" width=1 height=4></td></tr></table>
</body></html>
'''
return string.Template(MESSAGE_TEMPLATE).substitute(title=title, banner=banner, detail=detail)
try:
from Crypto.Cipher.ARC4 import new as RC4Cipher
except ImportError:
logging.warn('Load Crypto.Cipher.ARC4 Failed, Use Pure Python Instead.')
class RC4Cipher(object):
def __init__(self, key):
x = 0
box = range(256)
for i, y in enumerate(box):
x = (x + y + ord(key[i % len(key)])) & 0xff
box[i], box[x] = box[x], y
self.__box = box
self.__x = 0
self.__y = 0
def encrypt(self, data):
out = []
out_append = out.append
x = self.__x
y = self.__y
box = self.__box
for char in data:
x = (x + 1) & 0xff
y = (y + box[x]) & 0xff
box[x], box[y] = box[y], box[x]
out_append(chr(ord(char) ^ box[(box[x] + box[y]) & 0xff]))
self.__x = x
self.__y = y
return ''.join(out)
def inflate(data):
return zlib.decompress(data, -zlib.MAX_WBITS)
def deflate(data):
return zlib.compress(data)[2:-4]
def format_response(status, headers, content):
if content:
headers.pop('content-length', None)
headers['Content-Length'] = str(len(content))
data = 'HTTP/1.1 %d %s\r\n%s\r\n\r\n%s' % (status, httplib.responses.get(status, 'Unknown'), '\r\n'.join('%s: %s' % (k.title(), v) for k, v in headers.items()), content)
data = deflate(data)
return struct.pack('!h', len(data)) + data
def application(environ, start_response):
if environ['REQUEST_METHOD'] == 'GET' and 'HTTP_X_URLFETCH_PS1' not in environ:
timestamp = long(os.environ['CURRENT_VERSION_ID'].split('.')[1])/2**28
ctime = time.strftime('%Y-%m-%d %H:%M:%S', time.gmtime(timestamp+8*3600))
start_response('200 OK', [('Content-Type', 'text/plain')])
yield 'GoAgent Python Server %s works, deployed at %s\n' % (__version__, ctime)
if len(__password__) > 2:
yield 'Password: %s%s%s' % (__password__[0], '*'*(len(__password__)-2), __password__[-1])
raise StopIteration
start_response('200 OK', [('Content-Type', 'image/gif')])
if environ['REQUEST_METHOD'] == 'HEAD':
raise StopIteration
options = environ.get('HTTP_X_URLFETCH_OPTIONS', '')
if 'rc4' in options and not __password__:
yield format_response(400, {'Content-Type': 'text/html; charset=utf-8'}, message_html('400 Bad Request', 'Bad Request (options) - please set __password__ in gae.py', 'please set __password__ and upload gae.py again'))
raise StopIteration
try:
if 'HTTP_X_URLFETCH_PS1' in environ:
payload = inflate(base64.b64decode(environ['HTTP_X_URLFETCH_PS1']))
body = inflate(base64.b64decode(environ['HTTP_X_URLFETCH_PS2'])) if 'HTTP_X_URLFETCH_PS2' in environ else ''
else:
wsgi_input = environ['wsgi.input']
input_data = wsgi_input.read(int(environ.get('CONTENT_LENGTH', '0')))
if 'rc4' in options:
input_data = RC4Cipher(__password__).encrypt(input_data)
payload_length, = struct.unpack('!h', input_data[:2])
payload = inflate(input_data[2:2+payload_length])
body = input_data[2+payload_length:]
raw_response_line, payload = payload.split('\r\n', 1)
method, url = raw_response_line.split()[:2]
headers = {}
for line in payload.splitlines():
key, value = line.split(':', 1)
headers[key.title()] = value.strip()
except (zlib.error, KeyError, ValueError):
import traceback
yield format_response(500, {'Content-Type': 'text/html; charset=utf-8'}, message_html('500 Internal Server Error', 'Bad Request (payload) - Possible Wrong Password', '<pre>%s</pre>' % traceback.format_exc()))
raise StopIteration
kwargs = {}
any(kwargs.__setitem__(x[len('x-urlfetch-'):].lower(), headers.pop(x)) for x in headers.keys() if x.lower().startswith('x-urlfetch-'))
if 'Content-Encoding' in headers and body:
if headers['Content-Encoding'] == 'deflate':
body = inflate(body)
headers['Content-Length'] = str(len(body))
del headers['Content-Encoding']
logging.info('%s "%s %s %s" - -', environ['REMOTE_ADDR'], method, url, 'HTTP/1.1')
if __password__ and __password__ != kwargs.get('password', ''):
yield format_response(403, {'Content-Type': 'text/html; charset=utf-8'}, message_html('403 Wrong password', 'Wrong password(%r)' % kwargs.get('password', ''), 'GoAgent proxy.ini password is wrong!'))
raise StopIteration
netloc = urlparse.urlparse(url).netloc
if __hostsdeny__ and netloc.endswith(__hostsdeny__):
yield format_response(403, {'Content-Type': 'text/html; charset=utf-8'}, message_html('403 Hosts Deny', 'Hosts Deny(%r)' % netloc, detail='url=%r' % url))
raise StopIteration
if len(url) > MAX_URL_LENGTH:
yield format_response(400, {'Content-Type': 'text/html; charset=utf-8'}, message_html('400 Bad Request', 'length of URL too long(greater than %r)' % MAX_URL_LENGTH, detail='url=%r' % url))
raise StopIteration
if netloc.startswith(('127.0.0.', '::1', 'localhost')):
yield format_response(400, {'Content-Type': 'text/html; charset=utf-8'}, message_html('GoAgent %s is Running' % __version__, 'Now you can visit some websites', ''.join('<a href="https://%s/">%s</a><br/>' % (x, x) for x in ('google.com', 'mail.google.com'))))
raise StopIteration
fetchmethod = getattr(urlfetch, method, None)
if not fetchmethod:
yield format_response(405, {'Content-Type': 'text/html; charset=utf-8'}, message_html('405 Method Not Allowed', 'Method Not Allowed: %r' % method, detail='Method Not Allowed URL=%r' % url))
raise StopIteration
timeout = int(kwargs.get('timeout', URLFETCH_TIMEOUT))
validate_certificate = bool(int(kwargs.get('validate', 0)))
maxsize = int(kwargs.get('maxsize', 0))
# https://www.freebsdchina.org/forum/viewtopic.php?t=54269
accept_encoding = headers.get('Accept-Encoding', '') or headers.get('Bccept-Encoding', '')
errors = []
for i in xrange(int(kwargs.get('fetchmax', URLFETCH_MAX))):
try:
response = urlfetch.fetch(url, body, fetchmethod, headers, allow_truncated=False, follow_redirects=False, deadline=timeout, validate_certificate=validate_certificate)
break
except apiproxy_errors.OverQuotaError as e:
time.sleep(5)
except urlfetch.DeadlineExceededError as e:
errors.append('%r, timeout=%s' % (e, timeout))
logging.error('DeadlineExceededError(timeout=%s, url=%r)', timeout, url)
time.sleep(1)
timeout *= 2
except urlfetch.DownloadError as e:
errors.append('%r, timeout=%s' % (e, timeout))
logging.error('DownloadError(timeout=%s, url=%r)', timeout, url)
time.sleep(1)
timeout *= 2
except urlfetch.ResponseTooLargeError as e:
errors.append('%r, timeout=%s' % (e, timeout))
response = e.response
logging.error('ResponseTooLargeError(timeout=%s, url=%r) response(%r)', timeout, url, response)
m = re.search(r'=\s*(\d+)-', headers.get('Range') or headers.get('range') or '')
if m is None:
headers['Range'] = 'bytes=0-%d' % (maxsize or URLFETCH_MAXSIZE)
else:
headers.pop('Range', '')
headers.pop('range', '')
start = int(m.group(1))
headers['Range'] = 'bytes=%s-%d' % (start, start+(maxsize or URLFETCH_MAXSIZE))
timeout *= 2
except urlfetch.SSLCertificateError as e:
errors.append('%r, should validate=0 ?' % e)
logging.error('%r, timeout=%s', e, timeout)
except Exception as e:
errors.append(str(e))
if i == 0 and method == 'GET':
timeout *= 2
else:
error_string = '<br />\n'.join(errors)
if not error_string:
logurl = 'https://appengine.google.com/logs?&app_id=%s' % os.environ['APPLICATION_ID']
error_string = 'Internal Server Error. <p/>try <a href="javascript:window.location.reload(true);">refresh</a> or goto <a href="%s" target="_blank">appengine.google.com</a> for details' % logurl
yield format_response(502, {'Content-Type': 'text/html; charset=utf-8'}, message_html('502 Urlfetch Error', 'Python Urlfetch Error: %r' % method, error_string))
raise StopIteration
#logging.debug('url=%r response.status_code=%r response.headers=%r response.content[:1024]=%r', url, response.status_code, dict(response.headers), response.content[:1024])
status_code = int(response.status_code)
data = response.content
response_headers = response.headers
content_type = response_headers.get('content-type', '')
if status_code == 200 and maxsize and len(data) > maxsize and response_headers.get('accept-ranges', '').lower() == 'bytes' and int(response_headers.get('content-length', 0)):
status_code = 206
response_headers['Content-Range'] = 'bytes 0-%d/%d' % (maxsize-1, len(data))
data = data[:maxsize]
if status_code == 200 and 'content-encoding' not in response_headers and 512 < len(data) < URLFETCH_DEFLATE_MAXSIZE and content_type.startswith(('text/', 'application/json', 'application/javascript')):
if 'gzip' in accept_encoding:
response_headers['Content-Encoding'] = 'gzip'
compressobj = zlib.compressobj(zlib.Z_DEFAULT_COMPRESSION, zlib.DEFLATED, -zlib.MAX_WBITS, zlib.DEF_MEM_LEVEL, 0)
dataio = io.BytesIO()
dataio.write('\x1f\x8b\x08\x00\x00\x00\x00\x00\x02\xff')
dataio.write(compressobj.compress(data))
dataio.write(compressobj.flush())
dataio.write(struct.pack('<LL', zlib.crc32(data) & 0xFFFFFFFFL, len(data) & 0xFFFFFFFFL))
data = dataio.getvalue()
elif 'deflate' in accept_encoding:
response_headers['Content-Encoding'] = 'deflate'
data = deflate(data)
response_headers['Content-Length'] = str(len(data))
if 'rc4' not in options:
yield format_response(status_code, response_headers, '')
yield data
else:
cipher = RC4Cipher(__password__)
yield cipher.encrypt(format_response(status_code, response_headers, ''))
yield cipher.encrypt(data)