From 2bdd602c281361affe6feaa4825efe6583654ba8 Mon Sep 17 00:00:00 2001
From: stevetwalker <29964517+stevetwalker@users.noreply.github.com>
Date: Sun, 26 Apr 2020 20:26:28 -0700
Subject: [PATCH] Initial commit

---
 http_server.py | 88 +++++++++++++++++++++++++++++---------------------
 1 file changed, 51 insertions(+), 37 deletions(-)

diff --git a/http_server.py b/http_server.py
index 58d7386..158fedd 100644
--- a/http_server.py
+++ b/http_server.py
@@ -1,6 +1,8 @@
 import socket
 import sys
 import traceback
+import os
+import mimetypes
 
 def response_ok(body=b"This is a minimal response", mimetype=b"text/plain"):
     """
@@ -19,22 +21,30 @@ def response_ok(body=b"This is a minimal response", mimetype=b"text/plain"):
         '''
     """
 
-    # TODO: Implement response_ok
-    return b""
+    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"""
 
-    # TODO: Implement response_method_not_allowed
-    return b""
-
+    return b"\r\n".join([
+        b"HTTP/1.1 405 Method Not Allowed",
+        b"",
+        b"There's no place for a method like that on a server like this.",
+    ])
 
 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"",
+        b"Looks like you're barking up the wrong tree, my friend.",
+    ])
 
 def parse_request(request):
     """
@@ -44,8 +54,14 @@ def parse_request(request):
     NotImplementedError if the method of the request is not GET.
     """
 
-    # TODO: implement parse_request
-    return ""
+    # The path is always in the first line of an HTTP request.
+    # The first line is structured as {method} {path} {version} (e.g. GET /library HTTP/1.1).
+    method, path, version = request.split("\r\n")[0].split(" ")
+
+    if method != "GET":
+        raise NotImplementedError
+    
+    return path
 
 def response_path(path):
     """
@@ -75,19 +91,24 @@ def response_path(path):
 
     """
 
-    # TODO: Raise a NameError if the requested content is not present
-    # under webroot.
+    # os.path.abspath('.') returns the path of the current directory
+    path = os.path.abspath('.') + '/webroot' + path
 
-    # 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"
+    # If the path leads to a file, serve it up
+    if os.path.isfile(path):
+        filetype = path[path.rfind("."):]
+        mime_type = mimetypes.types_map[filetype].encode()
+        with open(path, 'rb') as file:
+            content = file.read()
+
+    # If the path leads to a directory, list its contents
+    elif os.path.isdir(path):
+        content = ", ".join(os.listdir(path)).encode()
+        mime_type = b"text/plain"
+
+    # If the path doesn't exist, raise a NameError
+    else:
+        raise NameError
 
     return content, mime_type
 
@@ -115,23 +136,18 @@ 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.
+                try:
+                    path = parse_request(request)
+                    body, mime_type = response_path(path)
+                    response = response_ok(body, mime_type)
 
-                # TODO: Use response_path to retrieve the content and the mimetype,
-                # based on the request path.
+                except NotImplementedError:
+                    response = response_method_not_allowed()
 
-                # 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"
-                )
+                except NameError:
+                    response = response_not_found()
 
                 conn.sendall(response)
             except:
@@ -149,5 +165,3 @@ def server(log_buffer=sys.stderr):
 if __name__ == '__main__':
     server()
     sys.exit(0)
-
-