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#
# Copyright 2019 aiohomekit team
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
import logging
from typing import Union
from aiohomekit.exceptions import HttpException
logger = logging.getLogger(__name__)
class HttpResponse:
STATE_PRE_STATUS = 0
STATE_HEADERS = 1
STATE_BODY = 2
STATE_DONE = 3
def __init__(self) -> None:
self._state = HttpResponse.STATE_PRE_STATUS
self._raw_response = bytearray()
self._is_ready = False
self._is_chunked = False
self._had_empty_chunk = False
self._content_length = -1
self.version = None
self.code = None
self.reason = None
self.headers = []
self.body = bytearray()
def parse(self, part: Union[bytearray, bytes]) -> bytearray:
self._raw_response += part
pos = self._raw_response.find(b"\r\n")
while pos != -1 and self._state < HttpResponse.STATE_BODY:
line = self._raw_response[:pos]
self._raw_response = self._raw_response[pos + 2 :]
if self._state == HttpResponse.STATE_PRE_STATUS:
# parse status line
line = line.split(b" ", 2)
if len(line) != 3:
raise HttpException("Malformed status line.")
self.version = line[0].decode()
self.code = int(line[1])
self.reason = line[2].decode()
self._state = HttpResponse.STATE_HEADERS
elif self._state == HttpResponse.STATE_HEADERS and line == b"":
# this is the empty line after the headers
self._state = HttpResponse.STATE_BODY
elif self._state == HttpResponse.STATE_HEADERS:
# parse a header line
line = line.split(b":", 1)
name = line[0].decode().strip().title()
value = line[1].decode().strip()
if name == "Transfer-Encoding":
if value == "chunked":
self._is_chunked = True
elif name == "Content-Length":
self._content_length = int(value)
self.headers.append((name, value))
else:
raise HttpException("Unknown parser state")
pos = self._raw_response.find(b"\r\n")
if self._state == HttpResponse.STATE_BODY and self._is_chunked:
pos = self._raw_response.find(b"\r\n")
while pos > -1:
line = self._raw_response[:pos]
self._raw_response = self._raw_response[pos + 2 :]
length = int(line, 16)
if length + 2 > len(self._raw_response):
self._raw_response = line + b"\r\n" + self._raw_response
# the remaining bytes in raw response are not sufficient. bail out and wait for an other call.
break
if length == 0:
self._had_empty_chunk = True
self._state = HttpResponse.STATE_DONE
self._raw_response = self._raw_response[length + 2 :]
break
line = self._raw_response[:length]
self.body += line
self._raw_response = self._raw_response[length + 2 :]
pos = self._raw_response.find(b"\r\n")
if self._state == HttpResponse.STATE_BODY and self._content_length > 0:
remaining = self._content_length - len(self.body)
self.body += self._raw_response[:remaining]
self._raw_response = self._raw_response[remaining:]
if self.is_read_completely():
# Whatever is left in the buffer is part of the next request
if len(self._raw_response) > 0:
logger.debug(
"Bytes left in buffer after parsing packet: %r", self._raw_response
)
return self._raw_response
return bytearray()
def read(self):
"""
Returns the body of the response.
:return: The read body or None if no body content was read yet
"""
return self.body
def is_read_completely(self) -> bool:
if self._is_chunked:
return self._had_empty_chunk
if self._state < HttpResponse.STATE_BODY:
return False
if self._content_length != -1:
return len(self.body) == self._content_length
return True
def get_http_name(self) -> str:
"""
Returns the HTTP name (e.g. HTTP or EVENT).
:return: The name or None if the status line was not yet read
"""
if self.version is not None:
return self.version.split("/")[0]
return None
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