Модули для обработки http-запросов, базовый обработчик url-путей. Обертка для работы с shelve базами данных, html-шаблонизатор.

1 files changed, 91 insertions, 0 deletions

diff --git a/day7/utils.py b/day7/utils.py
new file mode 100644
index 0000000..0aa0709
--- /dev/null
+++ b/day7/utils.py
@@ -0,0 +1,91 @@
+import re
+from time import strftime, gmtime
+
+_URI_RESERVED = {
+    '21': '!', '23': '#', '24': '$', '26': '&',
+    '27': '\'', '28': '(', '29': ')', '2A': '*',
+    '2B': '+', '2C': ',', '2F': '/', '3A': ':',
+    '3B': ';', '3D': '=', '3F': '?', '40': '@',
+    '5B': '[', '5D': ']'
+}
+
+BAD_REQUEST = 'HTTP/1.1 400 Bad Request'
+NOT_FOUND = 'HTTP/1.1 404 Not Found'
+SUCCESS = 'HTTP/1.1 200 OK'
+METHOD_NOT_ALLOWED = 'HTTP/1.1 405 Method Not Allowed'
+
+
+def add_headers(status, html: str):
+    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):
+    url_pattern = re.compile(r'/((.*?/?)+)?')
+    return bool(url_pattern.fullmatch(url))
+
+
+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 parse_headers(request_line: str):
+    request = request_line.split('\r\n')
+    method, url, http_ver = request.pop(0).split()
+    headers = {}
+    for line in request:
+        field, value = line.split(': ', maxsplit=1)
+        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')
+
+    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]
+            if hex_value in _URI_RESERVED:
+                integer = ord(_URI_RESERVED[hex_value])
+            else:
+                integer = int(hex_value, 16)
+
+            encoded += bytes([integer])
+            i += 3
+            continue
+        else:
+            encoded += bytes([ord(url_line[i])])
+            i += 1
+
+    return encoded.decode()