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Completed Assignment 3: Web Protocols #16

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Completed Assignment 3: Web Protocols #16

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3586858
Completed assigned tasks.
gapaleo Aug 26, 2020
9a3120c
Completed assigned and optional tasks.
gapaleo Aug 27, 2020
17cc5a2
Removed redundant code
gapaleo Aug 27, 2020
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1 change: 1 addition & 0 deletions .gitignore
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
*pycache*
*solution*
*.idea*
.vscode
111 changes: 56 additions & 55 deletions http_server.py
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Original file line number Diff line number Diff line change
@@ -1,6 +1,10 @@
import socket
import sys
import traceback
import os
import mimetypes
import subprocess


def response_ok(body=b"This is a minimal response", mimetype=b"text/plain"):
"""
Expand All @@ -10,85 +14,93 @@ def response_ok(body=b"This is a minimal response", mimetype=b"text/plain"):
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
])

# TODO: Implement response_ok
return b""

def response_method_not_allowed():
"""Returns a 405 Method Not Allowed response"""

# TODO: Implement response_method_not_allowed
return b""
return b'\r\n'.join([
b'HTTP/1.1 405 Method Not Allowed',
b'Content-Type: text/plain',
b'',
b'405. You can\'t do that on this server!'
])


def response_not_found():
"""Returns a 404 Not Found response"""

# TODO: Implement response_not_found
return b""
return b'\r\n'.join([
b'HTTP/1.1 404 Not Found',
b'Content-Type: text/plain',
b'',
b'404. Page 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

# TODO: implement parse_request
return ""

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

"""

# TODO: Raise a NameError if the requested content is not present
# under webroot.

# TODO: 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`.

content = b"not implemented"
mime_type = b"not implemented"

temp_path = 'webroot' + path
local_path = os.path.normpath(temp_path)
if os.path.isdir(local_path):
files = [file_name.encode() for file_name in os.listdir(local_path)]
content = b'\r\n'.join(files)
mime_type = b'text/plain'
elif os.path.isfile(local_path):
if os.path.basename(local_path) == 'make_time.py':
content = subprocess.run(
['python', local_path], capture_output=True).stdout
mime_type = b'text/html'
else:
with open(local_path, 'rb') as reader:
content = b''
byte = reader.read(1)
while byte:
content += byte
byte = reader.read(1)
mime_type = mimetypes.guess_type(local_path)[0].encode()
else:
raise NameError
return content, mime_type


Expand All @@ -114,30 +126,21 @@ def server(log_buffer=sys.stderr):

if '\r\n\r\n' in request:
break


print("Request received:\n{}\n\n".format(request))

# TODO: Use parse_request to retrieve the path from the request.

# TODO: Use response_path to retrieve the content and the mimetype,
# based on the request path.

# TODO; 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=b"Welcome to my web server",
mimetype=b"text/plain"
)

try:
path = parse_request(request)
body, mimetype = response_path(path)
response = response_ok(body, mimetype)
except NotImplementedError:
response = response_method_not_allowed()
except NameError:
response = response_not_found()
conn.sendall(response)
except:
traceback.print_exc()
finally:
conn.close()
conn.close()

except KeyboardInterrupt:
sock.close()
Expand All @@ -149,5 +152,3 @@ def server(log_buffer=sys.stderr):
if __name__ == '__main__':
server()
sys.exit(0)