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# Copyright (C) 2015 Custodia Project Contributors - see LICENSE file
try:
# pylint: disable=import-error
from BaseHTTPServer import BaseHTTPRequestHandler
from SocketServer import ForkingMixIn, UnixStreamServer
except ImportError:
# pylint: disable=import-error
from http.server import BaseHTTPRequestHandler
from socketserver import ForkingMixIn, UnixStreamServer
import io
import os
import shutil
import six
import socket
import struct
import sys
import traceback
SO_PEERCRED = 17
class HTTPError(Exception):
def __init__(self, code=None, message=None):
self.code = code if code is not None else 500
self.mesg = message
super(HTTPError, self).__init__('%d: %s' % (self.code, self.mesg))
def stacktrace():
with io.BytesIO() as f:
_, _, tb = sys.exc_info()
traceback.print_tb(tb, None, file=f)
del tb
return f.getvalue()
class ForkingLocalHTTPServer(ForkingMixIn, UnixStreamServer):
server_string = "Custodia/0.1"
allow_reuse_address = True
socket_file = None
def __init__(self, server_address, handler_class, config):
UnixStreamServer.__init__(self, server_address, handler_class)
if 'consumers' not in config:
raise ValueError('Configuration does not provide any consumer')
self.config = config
if 'server_string' in self.config:
self.server_string = self.config['server_string']
def server_bind(self):
UnixStreamServer.server_bind(self)
self.socket_file = self.socket.getsockname()
def pipeline(self, request):
# auth framework here
authers = self.config.get('authenticators')
if authers is None:
raise HTTPError(403)
for auth in authers:
authers[auth].handle(request)
if 'valid_auth' not in request or request['valid_auth'] is not True:
raise HTTPError(403)
# Select consumer
path = request.get('path', '')
if not os.path.isabs(path):
raise HTTPError(400)
trail = []
while path != '':
if path in self.config['consumers']:
con = self.config['consumers'][path]
if len(trail) != 0:
request['trail'] = trail
return con.handle(request)
if path == '/':
path = ''
else:
head, tail = os.path.split(path)
trail.insert(0, tail)
path = head
raise HTTPError(404)
class LocalHTTPRequestHandler(BaseHTTPRequestHandler):
protocol_version = "HTTP/1.1"
def __init__(self, *args, **kwargs):
BaseHTTPRequestHandler.__init__(self, *args, **kwargs)
self.requestline = ''
self.request_version = ''
self.command = ''
self.raw_requestline = None
self.close_connection = 0
def version_string(self):
return self.server.server_string
@property
def peer_creds(self):
creds = self.request.getsockopt(socket.SOL_SOCKET, SO_PEERCRED,
struct.calcsize('3i'))
pid, uid, gid = struct.unpack('3i', creds)
return {'pid': pid, 'uid': uid, 'gid': gid}
def handle_one_request(self):
# Set a fake client address to make log functions happy
self.client_address = ['127.0.0.1', 0]
try:
if not self.server.pipeline:
self.close_connection = 1
return
self.raw_requestline = self.rfile.readline(65537)
if not self.raw_requestline:
self.close_connection = 1
return
if len(self.raw_requestline) > 65536:
self.requestline = ''
self.request_version = ''
self.command = ''
self.send_error(414)
self.wfile.flush()
return
if not self.parse_request():
return
request = {'creds': self.peer_creds,
'command': self.command,
'path': self.path,
'version': self.request_version,
'headers': self.headers}
try:
response = self.server.pipeline(request)
if response is None:
raise HTTPError(500)
except HTTPError as e:
self.send_error(e.code, e.mesg)
self.wfile.flush()
return
except socket.timeout as e:
self.log_error("Request timed out: %r", e)
self.close_connection = 1
return
except Exception as e: # pylint: disable=broad-except
self.log_error("Handler failed: %r", e)
self.log_traceback()
self.send_error(500)
self.wfile.flush()
return
self.send_response(response.get('code', 200))
for header, value in six.iteritems(response.get('headers', {})):
self.send_header(header, value)
self.end_headers()
output = response.get('output', None)
if hasattr(output, 'read'):
shutil.copyfileobj(output, self.wfile)
output.close()
else:
self.wfile.write(output.encode('utf-8'))
self.wfile.flush()
return
except socket.timeout as e:
self.log_error("Request timed out: %r", e)
self.close_connection = 1
return
def log_traceback(self):
self.log_error('Traceback:\n%s' % stacktrace())
class LocalHTTPServer(object):
def __init__(self, address, config):
if address[0] != '/':
raise ValueError('Must use absolute unix socket name')
if os.path.exists(address):
os.remove(address)
self.httpd = ForkingLocalHTTPServer(address, LocalHTTPRequestHandler,
config)
def get_socket(self):
return (self.httpd.socket, self.httpd.socket_file)
def serve(self):
return self.httpd.serve_forever()
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