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import re
from time import strftime, gmtime
from string import ascii_letters
HTTP_STATUS_CODES = {
100: "Continue",
101: "Switching Protocols",
102: "Processing",
200: "OK",
201: "Created",
202: "Accepted",
203: "Non Authoritative Information",
204: "No Content",
205: "Reset Content",
206: "Partial Content",
207: "Multi Status",
226: "IM Used", # see RFC 3229
300: "Multiple Choices",
301: "Moved Permanently",
302: "Found",
303: "See Other",
304: "Not Modified",
305: "Use Proxy",
307: "Temporary Redirect",
308: "Permanent Redirect",
400: "Bad Request",
401: "Unauthorized",
402: "Payment Required", # unused
403: "Forbidden",
404: "Not Found",
405: "Method Not Allowed",
406: "Not Acceptable",
407: "Proxy Authentication Required",
408: "Request Timeout",
409: "Conflict",
410: "Gone",
411: "Length Required",
412: "Precondition Failed",
413: "Request Entity Too Large",
414: "Request URI Too Long",
415: "Unsupported Media Type",
416: "Requested Range Not Satisfiable",
417: "Expectation Failed",
418: "I'm a teapot", # see RFC 2324
421: "Misdirected Request", # see RFC 7540
422: "Unprocessable Entity",
423: "Locked",
424: "Failed Dependency",
426: "Upgrade Required",
428: "Precondition Required", # see RFC 6585
429: "Too Many Requests",
431: "Request Header Fields Too Large",
449: "Retry With", # proprietary MS extension
451: "Unavailable For Legal Reasons",
500: "Internal Server Error",
501: "Not Implemented",
502: "Bad Gateway",
503: "Service Unavailable",
504: "Gateway Timeout",
505: "HTTP Version Not Supported",
507: "Insufficient Storage",
510: "Not Extended",
}
HTTP_VERSION = 'HTTP/1.1'
HTTP_METHODS = ['GET', 'POST', 'OPTIONS', 'HEAD', 'PUT', 'PATCH', 'DELETE', 'TRACE', 'CONNECT']
URL_REGEX_PATTERN = re.compile(r'/((.*?/?)+)?')
FIRST_LINE_PATTERN = re.compile(rf'{"(" + "|".join(HTTP_METHODS) + ")"} {URL_REGEX_PATTERN.pattern} HTTP/1\.[01]')
def get_status_code(code):
return f'{HTTP_VERSION} {code} {HTTP_STATUS_CODES[code]}'
SUCCESS = get_status_code(200)
BAD_REQUEST = get_status_code(400)
NOT_FOUND = get_status_code(404)
METHOD_NOT_ALLOWED = get_status_code(405)
def add_text_headers(status, html: str):
"""
Добавляет заголовки к ответной html-странице
"""
return '\r\n'.join([
status,
f'Date: {strftime("%a, %d %b %Y %H:%M:%S GMT", gmtime())}',
'Server: BrandNewServer',
'Content-Type: text/html; charset=utf-8',
'Connection: keep-alive',
'', html
])
def validate_url(url):
return bool(URL_REGEX_PATTERN.fullmatch(url))
def validate_first_line(line):
return bool(FIRST_LINE_PATTERN.fullmatch(line))
def parse_cookies(cookies_line: str):
cookies_line = cookies_line.strip().strip(';')
pairs = cookies_line.split(';')
d = {}
for pair in pairs:
try:
key, value = pair.split('=', maxsplit=1)
d[key] = value
except ValueError:
raise ValueError('Wrong format of cookies')
return d
def format_cookies(cookies: dict):
"""
Формирование cookie-строки из переданного словаря.
"""
pairs = []
for key, value in cookies:
pairs.append(f'{key}={value}')
return ';'.join(pairs)
def parse_headers(request_line: str):
request = request_line.split('\r\n')
first_line = request.pop(0)
if validate_first_line(first_line):
method, url, http_ver = first_line.split()
else:
# Я не знаю зачем в условии необходимо завершать работу сервера, если пришел не-HTTP запрос,
# поэтому оставлю эту строку здесь.
# raise ValueError('Wrong format of HTTP request')
raise ConnectionError('Wrong format of HTTP request')
headers = {}
for line in request:
try:
field, value = line.split(': ', maxsplit=1)
except ValueError:
# raise ValueError('Wrong format of HTTP header')
raise ConnectionError('Wrong format of HTTP request')
headers[field] = value
return method, url, http_ver, headers
def parse_query(query_line: str):
pairs = query_line.strip().split('&')
d = {}
for pair in pairs:
try:
key, value = pair.split('=', maxsplit=1)
d[url_decoder(key)] = url_decoder(value)
except ValueError:
# raise ValueError('Wrong format of query')
raise ConnectionError('Wrong format of query')
return d
def url_decoder(url_line: str):
url_line = url_line.replace('+', ' ')
encoded = b''
i = 0
while i < len(url_line):
if url_line[i] == '%':
hex_value = url_line[i + 1: i + 3]
encoded += bytes([int(hex_value, 16)])
i += 3
continue
else:
encoded += bytes([ord(url_line[i])])
i += 1
return encoded.decode()
def url_encoder(line: str):
s = ''
for char in line:
if char == ' ':
s += '+'
elif char not in ascii_letters:
for byte in char.encode():
s += '%' + hex(byte)[2:].upper()
else:
s += char
return s
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