lesson 37

http_server.py

 from request import Request
+from response import Response
+from static_responder import StaticResponder
 
 import socketserver
 
@@ -8,29 +10,23 @@ class Handler(socketserver.StreamRequestHandler):
     
     def handle(self):
         request = Request(self.rfile)
+        response = Response(self.wfile)
+        static_responder = StaticResponder(request, response)
 
         print(request)
         
-        response_body = '<h1>Hello World!</h1>'
-        response_body_len = len(response_body.encode())
+        if static_responder.file:
+            static_responder.prepare_response()
 
-        response = (
-            'HTTP/1.1 200 OK',
-            'Content-Type: text/html',
-            f'Content-Length: {response_body_len}',
-            'Connection: close',
-            '',
-            response_body,
-        )
-        self.wfile.write('\r\n'.join(response).encode())
+        else:
+            response.add_header('Content-Type', 'text/html')
+            response.add_header('Connection', 'close')
+            response.set_body('<h1>Hello World!</h1>')
 
+        response.send()
         
-# CR - \r
-# LF - \n
-# b'GET / HTTP/1.1\r\nHost: localhost:1026\r\nConnection: keep-alive\r\nsec-ch-ua: "Google Chrome";v="119", "Chromium";v="119", "Not?A_Brand";v="24"\r\nsec-ch-ua-mobile: ?0\r\nsec-ch-ua-platform: "macOS"\r\nUpgrade-Insecure-Requests: 1\r\nUser-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7\r\nSec-Fetch-Site: none\r\nSec-Fetch-Mode: navigate\r\nSec-Fetch-User: ?1\r\nSec-Fetch-Dest: document\r\nAccept-Encoding: gzip, deflate, br\r\nAccept-Language: ru-RU,ru;q=0.9,en-US;q=0.8,en;q=0.7\r\n
 
-
-ADDRESS = ('localhost', 1026)
+ADDRESS = ('localhost', 1027)
 socketserver.ThreadingTCPServer.allow_reuse_address = True
 
 with socketserver.ThreadingTCPServer(ADDRESS, Handler) as server:

response.py

+from os import fstat
+
+
+class Response:
+    HTTP_OK = 200
+    HTTP_BAD_REQUEST = 400
+    HTTP_NOT_FOUND = 404
+    HTTP_INTERNAL_SERVER_ERROR = 500
+    
+    MESSAGES = {
+        HTTP_OK: 'OK',
+        HTTP_BAD_REQUEST: 'Bad Request',
+        HTTP_NOT_FOUND: 'Not Found',
+        HTTP_INTERNAL_SERVER_ERROR: 'Internal Server Error'
+    }
+
+    PROTOCOL = 'HTTP/1.1'
+    
+    def __init__(self, wfile):
+        self.wfile = wfile
+        self.status = self.HTTP_OK
+        self.headers = {}
+        self.body = None
+        self.file_body = None
+
+    def add_header(self, name, value):
+        self.headers[name] = value
+    
+    def set_body(self, body):
+        self.body = body.encode()
+        self.add_header('Content-Length', len(self.body))
+
+    def set_file_body(self, file):
+        self.file_body = file
+        size = fstat(file.fileno()).st_size
+        self.add_header('Content-Length', size)
+
+    def __get_status_line(self):
+        message = self.MESSAGES[self.status]
+        return f'{self.PROTOCOL} {self.status} {message}'
+
+    def __get_headers(self):
+        headers = []
+        
+        for name, value in self.headers.items():
+            headers.append(f'{name}: {value}')
+        
+        return headers
+
+    def _write_file_body(self):
+        while True:
+            data = self.file_body.read(1024)
+
+            if not data:
+                break
+
+            self.wfile.write(data)
+
+    def send(self):
+        status_line = self.__get_status_line()
+        headers = self.__get_headers()
+        
+        response_str = '\r\n'.join([status_line] + headers) + '\r\n\r\n'
+        self.wfile.write(response_str.encode())
+
+        if self.body:
+            self.wfile.write(self.body)
+
+        elif self.file_body:
+            self._write_file_body()
+            
\ No newline at end of file

static_responder.py

+from glob import glob
+import os
+
+
+class StaticResponder:
+
+    def __init__(self, request, response, static_dir='static'):
+        self.request = request
+        self.response = response
+        self.static_dir = static_dir
+        self.file = None
+        self._check_file()
+    
+    # http://localhost:1027/cat.jpg
+
+    def _check_file(self):
+        file_uri = self.request.uri.replace('..', '')
+        path = './' + self.static_dir + file_uri
+        
+        files = glob(path)
+        
+        if len(files) > 0 and os.path.isfile(files[0]):
+            self.file = files[0]
+
+    def prepare_response(self):
+        file = open(self.file, 'rb')
+        self.response.set_file_body(file)