client: fixed GET
This commit is contained in:
@@ -196,6 +196,11 @@ def parse_uri(uri: str):
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path = parsed.path
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if len(path) == 0 or path[0] != '/':
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path = "/" + path
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port_pos = host.find(":")
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if port_pos >= 0:
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host = host[:port_pos]
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return host, path
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@@ -213,7 +218,7 @@ def main():
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(host, path) = parse_uri(arguments.URI)
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client = HTTPClient(host)
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client.connect((host, arguments.port))
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client.connect((host, int(arguments.port)))
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message = "GET {path} HTTP/1.1\r\n".format(path=path)
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message += "Accept: */*\r\nAccept-Encoding: identity\r\n"
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@@ -1,46 +1,110 @@
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import logging
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import os
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import re
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from typing import Dict
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from urllib.parse import urlparse
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from bs4 import BeautifulSoup
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from client.Retriever import Retriever
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from client.httpclient import HTTPClient, UnsupportedEncoding, FORMAT, InvalidResponse, InvalidStatusLine
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def handle(client: HTTPClient, url: str):
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logging.debug("Waiting for response")
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try:
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buffer = client.receive()
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except TimeoutError:
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print("[ABRT] Response timed out")
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return
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try:
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(header_chunk, buffer) = client.get_crlf_chunk(buffer)
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(status_line, headers) = client.parse_headers(header_chunk)
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client.validate_status_line(status_line)
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status_code = int(status_line.split(" ")[1])
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response_handler = construct(client, headers, status_code, url)
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response_handler.handle(buffer)
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(version, status, _) = get_status_line(client)
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logging.debug("Parsed status-line: version: %s, status: %s", version, status)
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headers = get_headers(client)
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logging.debug("Parsed headers: %r", headers)
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response_handler = construct(client, headers, status, url)
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response_handler.handle()
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except InvalidResponse as e:
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logging.debug("Internal error: Response could not be parsed", exc_info=e)
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print("[ABRT] Invalid response")
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return
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except InvalidStatusLine as e:
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logging.debug("Internal error: Invalid status-line in response", exc_info=e)
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print("[ABRT] Invalid response")
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return
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except UnsupportedEncoding as e:
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logging.debug("Internal error: Unsupported encoding in response", exc_info=e)
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print("[ABRT] Invalid response")
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return
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def get_status_line(client: HTTPClient):
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line = client.read_line()
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split = list(filter(None, line.split(" ")))
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if len(split) < 3:
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raise InvalidStatusLine(line)
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# Check HTTP version
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http_version = split.pop(0)
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if len(http_version) < 8 or http_version[4] != "/":
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raise InvalidStatusLine(line)
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(name, version) = http_version[:4], http_version[5:]
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if name != "HTTP" or not re.match(r"1\.[0|1]", version):
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raise InvalidStatusLine(line)
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status = split.pop(0)
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if not re.match(r"\d{3}", status):
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raise InvalidStatusLine(line)
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status = int(status)
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if status < 100 or status > 999:
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raise InvalidStatusLine(line)
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reason = split.pop(0)
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return version, status, reason
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def get_headers(client: HTTPClient):
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headers = []
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# first header after the status-line may not contain a space
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while True:
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line = client.read_line()
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if line[0].isspace():
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continue
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else:
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break
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while True:
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if line in ("\r\n", "\n", " "):
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break
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if line[0].isspace():
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headers[-1] = headers[-1].rstrip("\r\n")
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headers.append(line.lstrip())
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line = client.read_line()
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result = {}
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header_str = "".join(headers)
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for line in header_str.splitlines():
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pos = line.find(":")
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if pos <= 0 or pos >= len(line) - 1:
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continue
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(header, value) = map(str.strip, line.split(":", 1))
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check_next_header(result, header, value)
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result[header.lower()] = value.lower()
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return result
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def check_next_header(headers, next_header: str, next_value: str):
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if next_header == "content-length":
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if "content-length" in headers:
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logging.error("Multiple content-length headers specified")
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raise InvalidResponse()
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if not next_value.isnumeric() or int(next_value) <= 0:
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logging.error("Invalid content-length value: %r", next_value)
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raise InvalidResponse()
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def construct(client: HTTPClient, headers, status_code, url):
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# only chunked transfer-encoding is supported
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transfer_encoding = headers.get("transfer-encoding")
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@@ -53,13 +117,12 @@ def construct(client: HTTPClient, headers, status_code, url):
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if content_encoding:
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raise UnsupportedEncoding("content-encoding", content_encoding)
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if chunked:
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return ChunkedResponseHandler(client, headers, status_code, url)
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else:
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retriever = Retriever.create(client, headers)
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content_type = headers.get("content-type")
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if content_type and "text/html" in content_type:
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return HTMLResponseHandler(client, headers, status_code, url)
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return PlainResponseHandler(client, headers, status_code, url)
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return HTMLDownloadHandler(retriever, client, headers, url)
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return RawDownloadHandler(retriever, client, headers, url)
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def parse_uri(uri: str):
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@@ -81,17 +144,54 @@ class ResponseHandler:
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headers: Dict[str, str]
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status_code: int
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url: str
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retriever: Retriever
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def __init__(self, client: HTTPClient, headers: Dict[str, str], status_code: int, url: str):
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def __init__(self, retriever: Retriever, client: HTTPClient, headers: Dict[str, str], url: str):
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self.client = client
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self.headers = headers
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self.status_code = status_code
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self.url = url
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self.retriever = retriever
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pass
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def handle(self, buffer: bytes):
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def handle(self):
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pass
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class DownloadHandler(ResponseHandler):
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path: str
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def __init__(self, retriever: Retriever, client: HTTPClient, headers: Dict[str, str], url: str, dir=None):
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super().__init__(retriever, client, headers, url)
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if not dir:
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dir = self._create_directory()
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self.path = self._get_duplicate_name(os.path.join(dir, self.get_filename()))
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@staticmethod
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def create(retriever: Retriever, client: HTTPClient, headers: Dict[str, str], url: str, dir=None):
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content_type = headers.get("content-type")
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if content_type and "text/html" in content_type:
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return HTMLDownloadHandler(retriever, client, headers, url, dir)
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return RawDownloadHandler(retriever, client, headers, url, dir)
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def handle(self) -> str:
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pass
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def _create_directory(self):
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path = self._get_duplicate_name(os.path.abspath(self.client.host))
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os.mkdir(path)
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return path
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def _get_duplicate_name(self, path):
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tmp_path = path
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i = 0
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while os.path.exists(tmp_path):
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i += 1
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tmp_path = "{path}.{counter}".format(path=path, counter=i)
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return tmp_path
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def get_filename(self):
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"""Returns the filename to download the payload to.
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"""
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@@ -118,131 +218,68 @@ class ResponseHandler:
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return "index.html"
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def _handle_download(self, client, url):
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logging.debug("Waiting for response")
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try:
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buffer = client.receive()
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except TimeoutError:
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print("[ABRT] Response timed out")
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return
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def _handle_sub_request(self, client, url):
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try:
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(header_chunk, buffer) = client.get_crlf_chunk(buffer)
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(status_line, headers) = client.parse_headers(header_chunk)
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client.validate_status_line(status_line)
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(version, status, _) = get_status_line(client)
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logging.debug("Parsed status-line: version: %s, status: %s", version, status)
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headers = get_headers(client)
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logging.debug("Parsed headers: %r", headers)
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status_code = int(status_line.split(" ")[1])
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if status_code != 200:
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raise InvalidResponse("Code not 200")
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if status != 200:
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raise InvalidResponse("Status not expected 200: " + str(status))
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response_handler = construct(client, headers, status_code, url)
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filename = response_handler.handle(buffer)
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retriever = Retriever.create(client, headers)
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handler = RawDownloadHandler(retriever, client, headers, url, os.path.dirname(self.path))
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return filename
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return handler.handle()
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except InvalidResponse as e:
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logging.debug("Internal error: Response could not be parsed", exc_info=e)
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print("[ABRT] Invalid response")
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return
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except InvalidStatusLine as e:
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logging.debug("Internal error: Invalid status-line in response", exc_info=e)
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print("[ABRT] Invalid response")
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return
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except UnsupportedEncoding as e:
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logging.debug("Internal error: Unsupported encoding in response", exc_info=e)
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print("[ABRT] Invalid response")
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return
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class RawDownloadHandler(DownloadHandler):
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def __init__(self, retriever: Retriever, client: HTTPClient, headers: Dict[str, str], url: str, dir=None):
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super().__init__(retriever, client, headers, url, dir)
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class PlainResponseHandler(ResponseHandler):
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def __init__(self, client: HTTPClient, headers, status_code, url):
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super().__init__(client, headers, status_code, url)
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def _get_payload_size(self):
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content_length = self.__get_content_length()
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if content_length == 0:
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logging.debug("content-length is 0")
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return None
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payload_size = content_length
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if not content_length:
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payload_size = -1
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logging.debug("No content-length specified")
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else:
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logging.debug("Expected content-length=%s", payload_size)
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return payload_size
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def handle(self, buffer: bytes):
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payload_size = self._get_payload_size()
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if payload_size is None:
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return
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def handle(self) -> str:
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logging.debug("Retrieving payload")
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filename = self.get_filename()
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file = open(filename, "wb")
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self._retrieve(file, buffer, payload_size)
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file = open(self.path, "wb")
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for buffer in self.retriever.retrieve():
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file.write(buffer)
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file.close()
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return filename
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return self.path
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def _retrieve(self, file, buffer: bytes, payload_size: int):
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class HTMLDownloadHandler(DownloadHandler):
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def __init__(self, retriever: Retriever, client: HTTPClient, headers: Dict[str, str], url: str, dir=None):
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super().__init__(retriever, client, headers, url, dir)
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def handle(self) -> str:
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(dir, file) = os.path.split(self.path)
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tmp_filename = ".{file}.tmp".format(file=file)
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tmp_path = os.path.join(dir, tmp_filename)
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file = open(tmp_path, "wb")
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for buffer in self.retriever.retrieve():
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file.write(buffer)
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cur_payload_size = len(buffer)
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while cur_payload_size < payload_size:
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buffer = self.client.receive()
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logging.debug("Received payload length: %s", len(buffer))
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if len(buffer) == 0:
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logging.warning("Received payload length %s less than expected %s", cur_payload_size, payload_size)
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break
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cur_payload_size += len(buffer)
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logging.debug("Processed payload: %r", cur_payload_size)
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file.write(buffer)
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def __get_content_length(self):
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content_length = self.headers.get("content-length")
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if not content_length:
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return None
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return int(content_length)
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class HTMLResponseHandler(PlainResponseHandler):
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def __init__(self, client: HTTPClient, headers, status_code, url):
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super().__init__(client, headers, status_code, url)
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def handle(self, buffer: bytes):
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payload_size = self._get_payload_size()
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if payload_size is None:
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return
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logging.debug("Retrieving payload")
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filename = self.get_filename()
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tmp_filename = "." + filename + ".tmp"
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file = open(tmp_filename, "wb")
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self._retrieve(file, buffer, payload_size)
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file.close()
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self.__download_images(tmp_filename, filename)
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os.remove(tmp_filename)
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return filename
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self.__download_images(tmp_path, self.path)
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os.remove(tmp_path)
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return self.path
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def __download_images(self, tmp_filename, target_filename):
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(host, path) = parse_uri(self.url)
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with open(tmp_filename, "r") as fp:
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soup = BeautifulSoup(fp, "lxml")
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with open(tmp_filename, "rb") as fp:
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soup = BeautifulSoup(fp, 'html.parser')
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for tag in soup.find_all("img"):
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try:
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tag["src"] = self.__download_image(tag["src"], host, path)
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except Exception as e:
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logging.error("Failed to download image, skipping...", exc_info=e)
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logging.error("Failed to download image: %s, skipping...", tag["src"], exc_info=e)
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with open(target_filename, 'w') as file:
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file.write(str(soup))
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@@ -250,6 +287,8 @@ class HTMLResponseHandler(PlainResponseHandler):
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def __download_image(self, img_src, host, path):
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parsed = urlparse(img_src)
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logging.debug("Downloading image: %s", img_src)
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same_host = True
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if len(parsed.netloc) == 0 or parsed.netloc == host:
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img_host = host
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@@ -271,21 +310,14 @@ class HTMLResponseHandler(PlainResponseHandler):
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if same_host:
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client = self.client
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client.reset_request()
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else:
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client = HTTPClient(img_src)
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client.connect((img_host, 80))
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client.sendall(message)
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filename = self._handle_download(client, img_host + img_path)
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filename = self._handle_sub_request(client, img_host + img_path)
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if not same_host:
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client.close()
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return filename
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class ChunkedResponseHandler(ResponseHandler):
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def __init__(self, client: HTTPClient, headers, status_code, url):
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super().__init__(client, headers, status_code, url)
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def handle(self, buffer: bytes):
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return None
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120
client/Retriever.py
Normal file
120
client/Retriever.py
Normal file
@@ -0,0 +1,120 @@
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import logging
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from typing import Dict
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from client.httpclient import HTTPClient, BUFSIZE, IncompleteResponse, InvalidResponse, UnsupportedEncoding
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class Retriever:
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client: HTTPClient
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headers: Dict[str, str]
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def __init__(self, client: HTTPClient):
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self.client = client
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def retrieve(self):
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pass
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@staticmethod
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def create(client: HTTPClient, headers: Dict[str, str]):
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# only chunked transfer-encoding is supported
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transfer_encoding = headers.get("transfer-encoding")
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if transfer_encoding and transfer_encoding != "chunked":
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raise UnsupportedEncoding("transfer-encoding", transfer_encoding)
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chunked = transfer_encoding
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# content-encoding is not supported
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content_encoding = headers.get("content-encoding")
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if content_encoding:
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raise UnsupportedEncoding("content-encoding", content_encoding)
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if chunked:
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return ChunkedRetriever(client)
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else:
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content_length = headers.get("content-length")
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if not content_length:
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logging.warning("Transfer-encoding and content-length not specified, trying without")
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return RawRetriever(client)
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return ContentLengthRetriever(client, int(content_length))
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class ContentLengthRetriever(Retriever):
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length: int
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def __init__(self, client: HTTPClient, length: int):
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super().__init__(client)
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self.length = length
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def retrieve(self):
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cur_payload_size = 0
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read_size = BUFSIZE
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while cur_payload_size < self.length:
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remaining = self.length - cur_payload_size
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if remaining < read_size:
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read_size = remaining
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try:
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buffer = self.client.read(remaining)
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except TimeoutError:
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logging.error("Timed out before receiving complete payload")
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self.client.close()
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raise IncompleteResponse("Timed out before receiving complete payload")
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except ConnectionError:
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logging.error("Timed out before receiving complete payload")
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self.client.close()
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raise IncompleteResponse("Connection closed before receiving complete payload")
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logging.debug("Received payload length: %s", len(buffer))
|
||||
|
||||
if len(buffer) == 0:
|
||||
logging.warning("Received payload length %s less than expected %s", cur_payload_size, self.length)
|
||||
break
|
||||
|
||||
cur_payload_size += len(buffer)
|
||||
logging.debug("Processed payload: %r", cur_payload_size)
|
||||
yield buffer
|
||||
|
||||
return b""
|
||||
|
||||
|
||||
class RawRetriever(Retriever):
|
||||
|
||||
def retrieve(self):
|
||||
while True:
|
||||
try:
|
||||
yield self.client.read()
|
||||
except TimeoutError or ConnectionError:
|
||||
return b""
|
||||
|
||||
|
||||
class ChunkedRetriever(Retriever):
|
||||
|
||||
def retrieve(self):
|
||||
while True:
|
||||
chunk_size = self._get_chunk_size()
|
||||
logging.debug("chunk-size: %s", chunk_size)
|
||||
if chunk_size == 0:
|
||||
self.client.reset_request()
|
||||
break
|
||||
|
||||
buffer = self.client.read(chunk_size)
|
||||
logging.debug("chunk: %r", buffer)
|
||||
yield buffer
|
||||
|
||||
self.client.read_line() # remove CRLF
|
||||
return b""
|
||||
|
||||
def _get_chunk_size(self):
|
||||
line = self.client.read_line()
|
||||
sep_pos = line.find(";")
|
||||
if sep_pos >= 0:
|
||||
line = line[:sep_pos]
|
||||
|
||||
try:
|
||||
return int(line, 16)
|
||||
except ValueError:
|
||||
raise InvalidResponse()
|
||||
@@ -1,21 +1,35 @@
|
||||
import logging
|
||||
import re
|
||||
import socket
|
||||
from typing import Dict
|
||||
from io import BufferedReader
|
||||
from typing import TextIO, IO
|
||||
|
||||
BUFSIZE = 4096
|
||||
TIMEOUT = 3
|
||||
FORMAT = "UTF-8"
|
||||
MAXLINE = 4096
|
||||
|
||||
|
||||
class HTTPClient(socket.socket):
|
||||
host: str
|
||||
file: BufferedReader
|
||||
|
||||
def __init__(self, host: str):
|
||||
|
||||
super().__init__(socket.AF_INET, socket.SOCK_STREAM)
|
||||
self.settimeout(TIMEOUT)
|
||||
self.host = host
|
||||
self.setblocking(True)
|
||||
self.settimeout(3.0)
|
||||
self.file = self.makefile("rb")
|
||||
|
||||
def close(self):
|
||||
self.file.close()
|
||||
super().close()
|
||||
|
||||
def reset_request(self):
|
||||
self.file.close()
|
||||
self.file = self.makefile("rb")
|
||||
|
||||
def _do_receive(self):
|
||||
if self.fileno() == -1:
|
||||
@@ -41,6 +55,26 @@ class HTTPClient(socket.socket):
|
||||
logging.debug("Timed out after waiting %s seconds for response", TIMEOUT * count)
|
||||
raise TimeoutError("Request timed out")
|
||||
|
||||
def read(self, size=BUFSIZE, blocking=True) -> bytes:
|
||||
if blocking:
|
||||
return self.file.read(size)
|
||||
|
||||
return self.file.read1(size)
|
||||
|
||||
def read_line(self):
|
||||
return str(self.read_bytes_line(), FORMAT)
|
||||
|
||||
def read_bytes_line(self):
|
||||
"""
|
||||
|
||||
:rtype: bytes
|
||||
"""
|
||||
line = self.file.readline(MAXLINE + 1)
|
||||
if len(line) > MAXLINE:
|
||||
raise InvalidResponse("Line too long")
|
||||
|
||||
return line
|
||||
|
||||
def validate_status_line(self, status_line: str):
|
||||
split = list(filter(None, status_line.split(" ")))
|
||||
if len(split) < 3:
|
||||
@@ -129,3 +163,7 @@ class UnsupportedEncoding(HTTPException):
|
||||
def __init(self, enc_type, encoding):
|
||||
self.enc_type = enc_type
|
||||
self.encoding = encoding
|
||||
|
||||
class IncompleteResponse(HTTPException):
|
||||
def __init(self, cause):
|
||||
self.cause = cause
|
||||
@@ -3,6 +3,7 @@
|
||||
import socket
|
||||
|
||||
# socket heeft een listening and accept method
|
||||
import time
|
||||
|
||||
SERVER = "127.0.0.1" #dynamisch fixen in project
|
||||
PORT = 5055
|
||||
@@ -26,8 +27,11 @@ def start():
|
||||
while connected: # while client is connected, we want to recieve messages
|
||||
msg = conn.recv(HEADER).decode(FORMAT).rstrip() # Argument is maximum size of msg (in project look into details of accp), decode is for converting bytes to strings, rstrip is for stripping messages for special hidden characters
|
||||
print("message: ", msg)
|
||||
if msg == DISCONNECT_MESSAGE:
|
||||
connected = False
|
||||
for i in range(0,10):
|
||||
conn.send(b"test")
|
||||
time.sleep(1)
|
||||
|
||||
break
|
||||
print("close connection ", addr[0], " disconnected.")
|
||||
conn.close()
|
||||
|
||||
|
||||
Reference in New Issue
Block a user