client: cleanup
This commit is contained in:
249
client.py
249
client.py
@@ -1,207 +1,9 @@
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#!/usr/bin/env python3
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import argparse
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import logging
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import re
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import socket
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import sys
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import time
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from urllib.parse import urlparse
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from client import ResponseHandler
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from client.httpclient import HTTPClient
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FORMAT = 'utf-8'
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BUFSIZE = 4096
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def receive_bytes_chunk(client: socket.socket):
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buffering = True
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buffer = b''
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while buffering:
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received = client.recv(BUFSIZE)
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received_size = len(received)
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logging.debug("Received size: %s", received_size)
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logging.debug("Received: %r", received)
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def receive_bytes(client: socket.socket):
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buffering = True
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buffer = b''
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while buffering:
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received = client.recv(BUFSIZE)
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received_size = len(received)
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logging.debug("Received size: %s", received_size)
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logging.debug("Received: %r", received)
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if received_size < BUFSIZE:
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buffering = False
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buffer += received
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lf_pos = buffer.find(b"\n\n")
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crlf_pos = buffer.find(b"\r\n\r\n")
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if lf_pos != -1 and lf_pos < crlf_pos:
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buffer_split = buffer.split(b"\n\n")
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else:
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buffer_split = buffer.split(b"\r\n\r\n")
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buffer = buffer_split[-1]
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for part in buffer_split[:-1]:
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yield part + b"\r\n\r\n"
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if buffer:
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buffering = True
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if buffer:
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yield buffer
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def receive(client: socket.socket):
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if client.fileno() == -1:
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raise Exception("Connection closed")
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result = client.recv(BUFSIZE)
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if len(result) == 0:
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time.sleep(0.1)
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result = client.recv(BUFSIZE)
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return result
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def parse_header(data: bytes):
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headers = {}
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# decode bytes, split into lines and filter
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header_split = list(
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filter(lambda l: l is not "" and not l[0].isspace(), map(str.strip, data.decode("utf-8").split("\n"))))
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if len(header_split) == 0:
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raise Exception("No start-line")
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start_line = header_split.pop(0)
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logging.debug("start-line: %r", start_line)
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for line in header_split:
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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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headers[header.upper()] = value
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logging.debug("Parsed headers: %r", headers)
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return start_line, headers
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def validate_status_line(status_line: str):
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split = list(filter(None, status_line.split(" ")))
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if len(split) < 3:
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return False
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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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return False
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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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return False
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if not re.match(r"\d{3}", split[0]):
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return False
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return True
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def get_chunk(buffer: bytes):
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lf_pos = buffer.find(b"\n\n")
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crlf_pos = buffer.find(b"\r\n\r\n")
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if lf_pos != -1 and lf_pos < crlf_pos:
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split_start = lf_pos
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split_end = lf_pos + 2
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else:
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split_start = crlf_pos
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split_end = crlf_pos + 4
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return buffer[:split_start], buffer[split_end:]
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def response_parser(client: socket.socket):
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try:
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buffer = client.recv(BUFSIZE)
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except TimeoutError as err:
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# TODO handler error appropriately
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logging.debug("[ERR] Socket timeout: %r", exc_info=err)
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return
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(header_chunk, buffer) = get_chunk(buffer)
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(status_line, headers) = parse_header(header_chunk)
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if not validate_status_line(status_line):
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raise Exception("Invalid status-line")
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logging.debug("valid status-line: %r", status_line)
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encoding = "plain"
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if "TRANSFER-ENCODING" in headers:
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encoding = headers["TRANSFER-ENCODING"]
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if encoding == "plain" and "CONTENT-LENGTH" in headers:
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payload_size = int(headers["CONTENT-LENGTH"])
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if payload_size == 0:
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return
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filename = util.get_html_filename(headers)
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f = open(filename, "wb")
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f.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 = receive(client)
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logging.debug("Received payload: %r", buffer)
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if len(buffer) == 0:
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logging.warning("Received payload length %s less than expected %s", payload_size, cur_payload_size)
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break
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cur_payload_size += len(buffer)
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f.write(buffer)
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f.close()
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def http_parser(client: socket.socket):
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headers = {}
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start_line = ""
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receiver = receive_bytes(client)
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(status_line, headers) = parse_header(next(receiver))
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if not validate_status_line(status_line):
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raise Exception("Invalid header")
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logging.debug("valid status-line: %r", status_line)
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for chunk in receiver:
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logging.debug("chunk: %r", chunk)
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def parse_uri(uri: str):
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parsed = urlparse(uri)
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# If there is no netloc, the url is invalid, so prepend `//` and try again
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if parsed.netloc == "":
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parsed = urlparse("//" + uri)
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host = parsed.netloc
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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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from client.command import Command
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def main():
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@@ -216,53 +18,8 @@ def main():
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logging.basicConfig(level=logging.ERROR - (10 * arguments.verbose))
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logging.debug("Arguments: %s", arguments)
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(host, path) = parse_uri(arguments.URI)
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client = HTTPClient(host)
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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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message += "Host: {host}\r\n\r\n".format(host=host)
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message = message.encode(FORMAT)
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logging.debug("Sending HTTP message: %r", message)
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client.sendall(message)
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ResponseHandler.handle(client, arguments.URI)
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# response_parser(client)
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# http_parser(client)
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# tmp = b''
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# keep = False
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# count = 0
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# for line in receive_bytes(client):
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#
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# if count > 0:
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# tmp += line.rstrip(b"\r\n")
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# if keep:
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# count += 1
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#
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# if line == b'\r\n':
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# keep = True
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#
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# logging.debug('end of part 1')
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#
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# logging.debug("attempt 2")
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# while True:
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# logging.debug("attempt")
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# keep = False
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# for line in receive_bytes(client):
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# if line == b"0\r\n":
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# break
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# if keep:
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# tmp += line.rstrip(b"\r\n")
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# keep = True
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#
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# if b"0\r\n" == line:
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# break
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# logging.debug("content: %s", tmp)
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# # logging.debug("content: %r", tmp.replace(b"\r\n", b"").decode("utf-8"))
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#
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# f = open("test.jpeg", "wb")
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# f.write(tmp)
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command = Command.create(arguments.command, arguments.URI, arguments.port)
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command.execute()
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try:
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@@ -10,121 +10,6 @@ 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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(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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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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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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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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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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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 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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parsed = urlparse(uri)
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@@ -156,6 +41,98 @@ class ResponseHandler:
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def handle(self):
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pass
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@staticmethod
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def create(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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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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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 HTMLDownloadHandler(retriever, client, headers, url)
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return RawDownloadHandler(retriever, client, headers, url)
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@staticmethod
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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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@staticmethod
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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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ResponseHandler.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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@staticmethod
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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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class DownloadHandler(ResponseHandler):
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path: str
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@@ -220,9 +197,9 @@ class DownloadHandler(ResponseHandler):
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def _handle_sub_request(self, client, url):
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(version, status, _) = get_status_line(client)
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(version, status, _) = self.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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headers = self.get_headers(client)
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logging.debug("Parsed headers: %r", headers)
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if status != 200:
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@@ -275,29 +252,37 @@ class HTMLDownloadHandler(DownloadHandler):
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with open(tmp_filename, "rb") as fp:
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soup = BeautifulSoup(fp, 'html.parser')
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base_url = self.url
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base_element = soup.find("base")
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if base_element:
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base_url = base_element["href"]
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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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tag["src"] = self.__download_image(tag["src"], host, base_url)
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except Exception as e:
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logging.error("Failed to download image: %s, skipping...", tag["src"], exc_info=e)
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logging.debug(e)
|
||||
logging.error("Failed to download image: %s, skipping...", tag["src"])
|
||||
|
||||
with open(target_filename, 'w') as file:
|
||||
file.write(str(soup))
|
||||
|
||||
def __download_image(self, img_src, host, path):
|
||||
def __download_image(self, img_src, host, base_url):
|
||||
parsed = urlparse(img_src)
|
||||
|
||||
logging.debug("Downloading image: %s", img_src)
|
||||
|
||||
same_host = True
|
||||
if len(parsed.netloc) == 0 and parsed.path != "/":
|
||||
# relative url, append base_url
|
||||
img_src = os.path.join(os.path.dirname(base_url), parsed.path)
|
||||
|
||||
parsed = urlparse(img_src)
|
||||
|
||||
# Check if the image is located on the same server
|
||||
if len(parsed.netloc) == 0 or parsed.netloc == host:
|
||||
same_host = True
|
||||
img_host = host
|
||||
if parsed.path[0] != "/":
|
||||
base = os.path.split(path)[0]
|
||||
if base[-1] != '/':
|
||||
base += "/"
|
||||
img_path = base + parsed.path
|
||||
else:
|
||||
img_path = parsed.path
|
||||
else:
|
||||
same_host = False
|
||||
|
||||
126
client/command.py
Normal file
126
client/command.py
Normal file
@@ -0,0 +1,126 @@
|
||||
import logging
|
||||
from urllib.parse import urlparse
|
||||
|
||||
from client.ResponseHandler import ResponseHandler
|
||||
from client.httpclient import FORMAT, HTTPClient, InvalidResponse, InvalidStatusLine, UnsupportedEncoding
|
||||
|
||||
|
||||
class Command:
|
||||
command: str
|
||||
|
||||
def __init__(self, url: str, port: str):
|
||||
self.url = url
|
||||
self.port = port
|
||||
|
||||
@staticmethod
|
||||
def create(command: str, url: str, port: str):
|
||||
if command == "GET":
|
||||
return GetCommand(url, port)
|
||||
elif command == "HEAD":
|
||||
return HeadCommand(url, port)
|
||||
elif command == "POST":
|
||||
return PostCommand(url, port)
|
||||
elif command == "PUT":
|
||||
return PutCommand(url, port)
|
||||
else:
|
||||
raise ValueError()
|
||||
|
||||
def execute(self):
|
||||
(host, path) = self.parse_uri()
|
||||
|
||||
client = HTTPClient(host)
|
||||
client.connect((host, int(self.port)))
|
||||
|
||||
message = f"{self.command} {path} HTTP/1.1\r\n"
|
||||
message += f"Host: {host}\r\n"
|
||||
message += "Accept: */*\r\nAccept-Encoding: identity\r\n"
|
||||
encoded_msg = self._build_message(message)
|
||||
|
||||
logging.info("---request begin---\r\n%s---request end---", encoded_msg.decode(FORMAT))
|
||||
|
||||
logging.debug("Sending HTTP message: %r", encoded_msg)
|
||||
client.sendall(encoded_msg)
|
||||
|
||||
logging.info("HTTP request sent, awaiting response...")
|
||||
|
||||
try:
|
||||
self._await_response(client)
|
||||
except InvalidResponse as e:
|
||||
logging.debug("Internal error: Response could not be parsed", exc_info=e)
|
||||
return
|
||||
except InvalidStatusLine as e:
|
||||
logging.debug("Internal error: Invalid status-line in response", exc_info=e)
|
||||
return
|
||||
except UnsupportedEncoding as e:
|
||||
logging.debug("Internal error: Unsupported encoding in response", exc_info=e)
|
||||
finally:
|
||||
client.close()
|
||||
|
||||
def _await_response(self, client: HTTPClient):
|
||||
pass
|
||||
|
||||
def _build_message(self, message: str) -> bytes:
|
||||
return (message + "\r\n").encode(FORMAT)
|
||||
|
||||
def parse_uri(self):
|
||||
parsed = urlparse(self.url)
|
||||
|
||||
# If there is no netloc, the url is invalid, so prepend `//` and try again
|
||||
if parsed.netloc == "":
|
||||
parsed = urlparse("//" + self.url)
|
||||
|
||||
host = parsed.netloc
|
||||
path = parsed.path
|
||||
if len(path) == 0 or path[0] != '/':
|
||||
path = "/" + path
|
||||
|
||||
port_pos = host.find(":")
|
||||
if port_pos >= 0:
|
||||
host = host[:port_pos]
|
||||
|
||||
return host, path
|
||||
|
||||
|
||||
class HeadCommand(Command):
|
||||
command = "HEAD"
|
||||
|
||||
def _await_response(self, client):
|
||||
while True:
|
||||
line = client.read_line()
|
||||
print(line, end="")
|
||||
if line in ("\r\n", "\n", ""):
|
||||
break
|
||||
|
||||
|
||||
class GetCommand(Command):
|
||||
command = "GET"
|
||||
|
||||
def _await_response(self, client):
|
||||
(version, status, msg) = ResponseHandler.get_status_line(client)
|
||||
logging.debug("Parsed status-line: version: %s, status: %s", version, status)
|
||||
headers = ResponseHandler.get_headers(client)
|
||||
logging.debug("Parsed headers: %r", headers)
|
||||
|
||||
handler = ResponseHandler.create(client, headers, status, self.url)
|
||||
handler.handle()
|
||||
|
||||
|
||||
class PostCommand(HeadCommand):
|
||||
command = "POST"
|
||||
|
||||
def _build_message(self, message: str) -> bytes:
|
||||
body = input("Enter POST data: ").encode(FORMAT)
|
||||
print()
|
||||
|
||||
message += "Content-Type: text/plain\r\n"
|
||||
message += f"Content-Length: {len(body)}\r\n"
|
||||
message += "\r\n"
|
||||
message = message.encode(FORMAT)
|
||||
message += body
|
||||
message += b"\r\n"
|
||||
|
||||
return message
|
||||
|
||||
|
||||
class PutCommand(PostCommand):
|
||||
command = "PUT"
|
||||
0
server/__init__.py
Normal file
0
server/__init__.py
Normal file
Reference in New Issue
Block a user