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http_server.py
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import socket
import sys
import traceback
import os
import mimetypes
from subprocess import Popen, PIPE
def response_ok(body=b"This is a minimal response", mimetype=b"text/plain"):
"""
returns a basic HTTP response
Ex:
response_ok(
b"<html><h1>Welcome:</h1></html>",
b"text/html"
) ->
b'''
HTTP/1.1 200 OK\r\n
Content-Type: text/html\r\n
\r\n
<html><h1>Welcome:</h1></html>\r\n
'''
"""
return b"\r\n".join([
b"HTTP/1.1 200 OK",
b"Content-Type: " + mimetype,
b"",
body,
])
def response_method_not_allowed():
"""Returns a 405 Method Not Allowed response"""
return b"\r\n".join([
b"HTTP/1.1 405 Method Not Allowed",
b"",
b"You can't do that on this server!"
])
def response_not_found():
"""Returns a 404 Not Found response"""
return b"HTTP/1.1 404 Not Found"
def parse_request(request):
"""
Given the content of an HTTP request, returns the path of that request.
This server only handles GET requests, so this method shall raise a
NotImplementedError if the method of the request is not GET.
"""
method, path, version = request.split("\r\n")[0].split(" ")
if method != "GET":
raise NotImplementedError
return path
def response_path(path):
"""
This method should return appropriate content and a mime type.
If the requested path is a directory, then the content should be a
plain-text listing of the contents with mimetype `text/plain`.
If the path is a file, it should return the contents of that file
and its correct mimetype.
If the path does not map to a real location, it should raise an
exception that the server can catch to return a 404 response.
Ex:
response_path('/a_web_page.html') -> (b"<html><h1>North Carolina...",
b"text/html")
response_path('/images/sample_1.png')
-> (b"A12BCF...", # contents of sample_1.png
b"image/png")
response_path('/') -> (b"images/, a_web_page.html, make_type.py,...",
b"text/plain")
response_path('/a_page_that_doesnt_exist.html') -> Raises a NameError
"""
full_path = "webroot" + path
if not os.path.exists(full_path):
raise NameError
if os.path.isdir(full_path):
content_list = os.listdir(full_path)
content_list = [item + '/' if '.' not in item else item for item in content_list]
content = "\n".join(content_list).encode('utf8')
mime_type = b"text/plain"
elif path.endswith(".py"):
process = Popen(f"python {full_path}", shell=True, stdout=PIPE)
content, stderr = process.communicate()
mime_type = b"text/html"
else:
with open(full_path, "rb") as fin:
content = fin.read()
mime_type = mimetypes.guess_type(full_path)[0].encode('utf8')
# DONE: Fill in the appropriate content and mime_type give the path.
# See the assignment guidelines for help on "mapping mime-types", though
# you might need to create a special case for handling make_time.py
#
# If the path is "make_time.py", then you may OPTIONALLY return the
# result of executing `make_time.py`. But you need only return the
# CONTENTS of `make_time.py`.
return content, mime_type
def server(log_buffer=sys.stderr):
address = ('127.0.0.1', 10000)
sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
print("making a server on {0}:{1}".format(*address), file=log_buffer)
sock.bind(address)
sock.listen(1)
try:
while True:
print('waiting for a connection', file=log_buffer)
conn, addr = sock.accept() # blocking
try:
print('connection - {0}:{1}'.format(*addr), file=log_buffer)
request = ''
while True:
data = conn.recv(1024)
request += data.decode('utf8')
if '\r\n\r\n' in request:
break
print("Request received:\n{}\n\n".format(request))
try:
path = parse_request(request)
# DONE: Use response_path to retrieve the content and the mimetype,
# based on the request path.
try:
content, mime_type = response_path(path)
# DONE; If parse_request raised a NotImplementedError, then let
# response be a method_not_allowed response. If response_path raised
# a NameError, then let response be a not_found response. Else,
# use the content and mimetype from response_path to build a
# response_ok.
response = response_ok(
body=content,
mimetype=mime_type
)
except NameError:
response = response_not_found()
except NotImplementedError:
response = response_method_not_allowed()
conn.sendall(response)
except:
traceback.print_exc()
finally:
conn.close()
except KeyboardInterrupt:
sock.close()
return
except:
traceback.print_exc()
if __name__ == '__main__':
server()
sys.exit(0)