Lib.modjy.modjy_response.py Maven / Gradle / Ivy
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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
###
#
# Copyright Alan Kennedy.
#
# You may contact the copyright holder at this uri:
#
# http://www.xhaus.com/contact/modjy
#
# The licence under which this code is released is the Apache License v2.0.
#
# The terms and conditions of this license are listed in a file contained
# in the distribution that also contained this file, under the name
# LICENSE.txt.
#
# You may also read a copy of the license at the following web address.
#
# http://modjy.xhaus.com/LICENSE.txt
#
###
import types
from java.lang import System
from modjy_exceptions import *
from modjy_write import write_object
# From: http://www.w3.org/Protocols/rfc2616/rfc2616-sec13.html#sec13.5.1
hop_by_hop_headers = {
'connection': None,
'keep-alive': None,
'proxy-authenticate': None,
'proxy-authorization': None,
'te': None,
'trailers': None,
'transfer-encoding': None,
'upgrade': None,
}
class start_response_object:
def __init__(self, req, resp):
self.http_req = req
self.http_resp = resp
self.write_callable = None
self.called = 0
self.content_length = None
# I'm doing the parameters this way to facilitate porting back to java
def __call__(self, *args, **keywords):
if len(args) < 2 or len(args) > 3:
raise BadArgument("Start response callback requires either two or three arguments: got %s" % str(args))
if len(args) == 3:
exc_info = args[2]
try:
try:
self.http_resp.reset()
except IllegalStateException, isx:
raise exc_info[0], exc_info[1], exc_info[2]
finally:
exc_info = None
else:
if self.called > 0:
raise StartResponseCalledTwice("Start response callback may only be called once, without exception information.")
status_str = args[0]
headers_list = args[1]
if not isinstance(status_str, types.StringType):
raise BadArgument("Start response callback requires string as first argument")
if not isinstance(headers_list, types.ListType):
raise BadArgument("Start response callback requires list as second argument")
try:
status_code, status_message_str = status_str.split(" ", 1)
self.http_resp.setStatus(int(status_code))
except ValueError:
raise BadArgument("Status string must be of the form ' '")
self.make_write_object()
try:
for header_name, header_value in headers_list:
header_name_lower = header_name.lower()
if hop_by_hop_headers.has_key(header_name_lower):
raise HopByHopHeaderSet("Under WSGI, it is illegal to set hop-by-hop headers, i.e. '%s'" % header_name)
if header_name_lower == "content-length":
try:
self.set_content_length(int(header_value))
except ValueError, v:
raise BadArgument("Content-Length header value must be a string containing an integer, not '%s'" % header_value)
else:
final_value = header_value.encode('latin-1')
# Here would be the place to check for control characters, whitespace, etc
self.http_resp.addHeader(header_name, final_value)
except (AttributeError, TypeError), t:
raise BadArgument("Start response callback headers must contain a list of (,) tuples")
except UnicodeError, u:
raise BadArgument("Encoding error: header values may only contain latin-1 characters, not '%s'" % repr(header_value))
except ValueError, v:
raise BadArgument("Headers list must contain 2-tuples")
self.called += 1
return self.write_callable
def set_content_length(self, length):
if self.write_callable.num_writes == 0:
self.content_length = length
self.http_resp.setContentLength(length)
else:
raise ResponseCommitted("Cannot set content-length: response is already commited.")
def make_write_object(self):
try:
self.write_callable = write_object(self.http_resp.getOutputStream())
except IOException, iox:
raise IOError(iox)
return self.write_callable