New request parsing (WIP: Documentation)

matemat/webserver/__init__.py

@@ -6,4 +6,5 @@ API that can be used by 'pagelets' - single pages of a web service.  If a reques
 server will attempt to serve the request with a static resource in a previously configured webroot directory.
 """
 
+from .requestargs import RequestArgument
 from .httpd import MatematWebserver, HttpHandler, pagelet

matemat/webserver/httpd.py

@@ -1,5 +1,5 @@
 
-from typing import Any, Callable, Dict, List, Tuple, Union
+from typing import Any, Callable, Dict, Tuple, Union
 
 import traceback
 
@@ -13,6 +13,7 @@ from uuid import uuid4
 from datetime import datetime, timedelta
 
 from matemat import __version__ as matemat_version
+from matemat.webserver import RequestArgument
 from matemat.webserver.util import parse_args
 
 
@@ -30,7 +31,7 @@ BaseHTTPRequestHandler.log_error = lambda self, fstring='', *args: None
 # Dictionary to hold registered pagelet paths and their handler functions
 _PAGELET_PATHS: Dict[str, Callable[[str,  # HTTP method (GET, POST, ...)
                                     str,  # Request path
-                                    Dict[str, Tuple[str, Union[bytes, str, List[str]]]],  # args: (name, (type, value))
+                                    Dict[str, RequestArgument],  # args: (name, argument)
                                     Dict[str, Any],  # Session vars
                                     Dict[str, str]],  # Response headers
                                    Tuple[int, Union[bytes, str]]]] = dict()  # Returns: (status code, response body)
@@ -50,15 +51,14 @@ def pagelet(path: str):
 
         (method: str,
          path: str,
-         args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+         args: Dict[str, RequestArgument],
          session_vars: Dict[str, Any],
          headers: Dict[str, str])
         -> (int, Optional[Union[str, bytes]])
 
         method:       The HTTP method (GET, POST) that was used.
         path:         The path that was requested.
-        args:         The arguments that were passed with the request (as GET or POST arguments), each of which may be
-                      either a str or bytes object, or a list of str.
+        args:         The arguments that were passed with the request (as GET or POST arguments).
         session_vars: The session storage.  May be read from and written to.
         headers:      The dictionary of HTTP response headers.  Add headers you wish to send with the response.
         returns:      A tuple consisting of the HTTP status code (as an int) and the response body (as str or bytes,
@@ -69,7 +69,7 @@ def pagelet(path: str):
 
     def http_handler(fun: Callable[[str,
                                     str,
-                                    Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+                                    Dict[str, RequestArgument],
                                     Dict[str, Any],
                                     Dict[str, str]],
                                    Tuple[int, Union[bytes, str]]]):
@@ -181,7 +181,7 @@ class HttpHandler(BaseHTTPRequestHandler):
         if session_id in self.server.session_vars:
             del self.server.session_vars[session_id]
 
-    def _handle(self, method: str, path: str, args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]]) -> None:
+    def _handle(self, method: str, path: str, args: Dict[str, RequestArgument]) -> None:
         """
         Handle a HTTP request by either dispatching it to the appropriate pagelet or by serving a static resource.
 

matemat/webserver/pagelets/__init__.py

@@ -8,4 +8,3 @@ from .main import main_page
 from .login import login_page
 from .logout import logout
 from .touchkey import touchkey_page
-from .upload_test import upload_test

matemat/webserver/pagelets/login.py

@@ -1,8 +1,8 @@
 
-from typing import Any, Dict, List, Optional, Tuple, Union
+from typing import Any, Dict, Optional, Tuple, Union
 
 from matemat.exceptions import AuthenticationError
-from matemat.webserver import pagelet
+from matemat.webserver import pagelet, RequestArgument
 from matemat.primitives import User
 from matemat.db import MatematDatabase
 
@@ -10,7 +10,7 @@ from matemat.db import MatematDatabase
 @pagelet('/login')
 def login_page(method: str,
                path: str,
-               args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+               args: Dict[str, RequestArgument],
                session_vars: Dict[str, Any],
                headers: Dict[str, str])\
         -> Tuple[int, Optional[Union[str, bytes]]]:
@@ -43,15 +43,11 @@ def login_page(method: str,
         '''
         return 200, data.format(msg=args['msg'] if 'msg' in args else '')
     elif method == 'POST':
-        if 'username' not in args or not isinstance(args['username'], str):
-            return 400, None
-        if 'password' not in args or not isinstance(args['password'], str):
-            return 400, None
-        username: str = args['username']
-        password: str = args['password']
+        username: RequestArgument = args['username']
+        password: RequestArgument = args['password']
         with MatematDatabase('test.db') as db:
             try:
-                user: User = db.login(username, password)
+                user: User = db.login(username.get_str(), password.get_str())
             except AuthenticationError:
                 headers['Location'] = '/login?msg=Username%20or%20password%20wrong.%20Please%20try%20again.'
                 return 301, bytes()

matemat/webserver/pagelets/logout.py

@@ -1,13 +1,13 @@
 
 from typing import Any, Dict, List, Optional, Tuple, Union
 
-from matemat.webserver import pagelet
+from matemat.webserver import pagelet, RequestArgument
 
 
 @pagelet('/logout')
 def logout(method: str,
            path: str,
-           args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+           args: Dict[str, RequestArgument],
            session_vars: Dict[str, Any],
            headers: Dict[str, str])\
         -> Tuple[int, Optional[Union[str, bytes]]]:

matemat/webserver/pagelets/main.py

@@ -1,7 +1,7 @@
 
 from typing import Any, Dict, List, Optional, Tuple, Union
 
-from matemat.webserver import MatematWebserver, pagelet
+from matemat.webserver import MatematWebserver, pagelet, RequestArgument
 from matemat.primitives import User
 from matemat.db import MatematDatabase
 
@@ -9,7 +9,7 @@ from matemat.db import MatematDatabase
 @pagelet('/')
 def main_page(method: str,
               path: str,
-              args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+              args: Dict[str, RequestArgument],
               session_vars: Dict[str, Any],
               headers: Dict[str, str])\
         -> Tuple[int, Optional[Union[str, bytes]]]:

matemat/webserver/pagelets/touchkey.py

@@ -2,7 +2,7 @@
 from typing import Any, Dict, List, Optional, Tuple, Union
 
 from matemat.exceptions import AuthenticationError
-from matemat.webserver import pagelet
+from matemat.webserver import pagelet, RequestArgument
 from matemat.primitives import User
 from matemat.db import MatematDatabase
 
@@ -10,7 +10,7 @@ from matemat.db import MatematDatabase
 @pagelet('/touchkey')
 def touchkey_page(method: str,
                   path: str,
-                  args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+                  args: Dict[str, RequestArgument],
                   session_vars: Dict[str, Any],
                   headers: Dict[str, str])\
         -> Tuple[int, Optional[Union[str, bytes]]]:
@@ -42,15 +42,11 @@ def touchkey_page(method: str,
         '''
         return 200, data.format(username=args['username'] if 'username' in args else '')
     elif method == 'POST':
-        if 'username' not in args or not isinstance(args['username'], str):
-            return 400, None
-        if 'touchkey' not in args or not isinstance(args['touchkey'], str):
-            return 400, None
-        username: str = args['username']
-        touchkey: str = args['touchkey']
+        username: RequestArgument = args['username']
+        touchkey: RequestArgument = args['touchkey']
         with MatematDatabase('test.db') as db:
             try:
-                user: User = db.login(username, touchkey=touchkey)
+                user: User = db.login(username.get_str(), touchkey=touchkey.get_str())
             except AuthenticationError:
                 headers['Location'] = f'/touchkey?username={args["username"]}&msg=Please%20try%20again.'
                 return 301, bytes()

matemat/webserver/pagelets/upload_test.py

@@ -1,28 +0,0 @@
-
-from typing import Any, Dict, Union
-
-from matemat.webserver import pagelet
-
-
-@pagelet('/upload')
-def upload_test(method: str,
-                path: str,
-                args: Dict[str, Union[str, bytes]],
-                session_vars: Dict[str, Any],
-                headers: Dict[str, str]):
-    if method == 'GET':
-        return 200, '''
-        <!DOCTYPE html>
-        <html>
-            <body>
-                <form method="post" action="#" enctype="multipart/form-data">
-                    <input type="file" name="testfile" />
-                    <input type="hidden" name="teststatic" value="statictest" />
-                    <input type="submit" value="Upload" />
-                </form>
-            </body>
-        </html>
-        '''
-    else:
-        headers['Content-Type'] = 'text/plain'
-        return 200, args.items().__str__()

matemat/webserver/requestargs.py

@@ -0,0 +1,121 @@
+
+from typing import List, Optional, Tuple, Union
+
+
+class RequestArgument(object):
+
+    def __init__(self,
+                 name: str,
+                 value: Union[Tuple[str, Union[bytes, str]], List[Tuple[str, Union[bytes, str]]]] = None) -> None:
+        self.__name: str = name
+        self.__value: Union[Tuple[str, Union[bytes, str]], List[Tuple[str, Union[bytes, str]]]] = None
+        if value is None:
+            self.__value = []
+        else:
+            if isinstance(value, list):
+                if len(value) == 1:
+                    self.__value = value[0]
+                else:
+                    self.__value = value
+            else:
+                self.__value = value
+
+    @property
+    def is_array(self) -> bool:
+        return isinstance(self.__value, list)
+
+    @property
+    def is_scalar(self) -> bool:
+        return not isinstance(self.__value, list)
+
+    @property
+    def is_view(self) -> bool:
+        return False
+
+    @property
+    def name(self) -> str:
+        return self.__name
+
+    def get_str(self, index: int = None) -> Optional[str]:
+        if self.is_array:
+            if index is None:
+                raise ValueError('index must not be None')
+            v: Tuple[str, Union[bytes, str]] = self.__value[index]
+            if isinstance(v[1], str):
+                return v[1]
+            elif isinstance(v[1], bytes):
+                return v[1].decode('utf-8')
+        else:
+            if index is not None:
+                raise ValueError('index must be None')
+            if isinstance(self.__value[1], str):
+                return self.__value[1]
+            elif isinstance(self.__value[1], bytes):
+                return self.__value[1].decode('utf-8')
+
+    def get_bytes(self, index: int = None) -> Optional[bytes]:
+        if self.is_array:
+            if index is None:
+                raise ValueError('index must not be None')
+            v: Tuple[str, Union[bytes, str]] = self.__value[index]
+            if isinstance(v[1], bytes):
+                return v[1]
+            elif isinstance(v[1], str):
+                return v[1].encode('utf-8')
+        else:
+            if index is not None:
+                raise ValueError('index must be None')
+            if isinstance(self.__value[1], bytes):
+                return self.__value[1]
+            elif isinstance(self.__value[1], str):
+                return self.__value[1].encode('utf-8')
+
+    def get_content_type(self, index: int = None) -> Optional[str]:
+        if self.is_array:
+            if index is None:
+                raise ValueError('index must not be None')
+            v: Tuple[str, Union[bytes, str]] = self.__value[index]
+            return v[0]
+        else:
+            if index is not None:
+                raise ValueError('index must be None')
+            return self.__value[0]
+
+    def append(self, ctype: str, value: Union[str, bytes]):
+        if self.is_view:
+            raise TypeError('A RequestArgument view is immutable!')
+        if len(self) == 0:
+            self.__value = ctype, value
+        else:
+            if self.is_scalar:
+                self.__value = [self.__value]
+            self.__value.append((ctype, value))
+
+    def __len__(self):
+        return len(self.__value) if self.is_array else 1
+
+    def __iter__(self):
+        if self.is_scalar:
+            yield _View(self.__name, self.__value)
+        else:
+            # Typing helper
+            _value: List[Tuple[str, Union[bytes, str]]] = self.__value
+            for v in _value:
+                yield _View(self.__name, v)
+
+    def __getitem__(self, index: Union[int, slice]):
+        if self.is_scalar:
+            if index == 0:
+                return _View(self.__name, self.__value)
+            raise ValueError('Scalar RequestArgument only indexable with 0')
+        return _View(self.__name, self.__value[index])
+
+
+class _View(RequestArgument):
+
+    def __init__(self, name: str, value: Union[Tuple[str, Union[bytes, str]], List[Tuple[str, Union[bytes, str]]]]):
+        super().__init__(name, value)
+
+    @property
+    def is_view(self) -> bool:
+        return True

matemat/webserver/test/abstract_httpd_test.py

@@ -9,7 +9,7 @@ from abc import ABC
 from datetime import datetime
 from http.server import HTTPServer
 
-from matemat.webserver.httpd import pagelet
+from matemat.webserver import pagelet, RequestArgument
 
 
 class HttpResponse:
@@ -158,14 +158,14 @@ def test_pagelet(path: str):
 
     def with_testing_headers(fun: Callable[[str,
                                             str,
-                                            Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+                                            Dict[str, RequestArgument],
                                             Dict[str, Any],
                                             Dict[str, str]],
                                            Tuple[int, Union[bytes, str]]]):
         @pagelet(path)
         def testing_wrapper(method: str,
                             path: str,
-                            args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+                            args: Dict[str, RequestArgument],
                             session_vars: Dict[str, Any],
                             headers: Dict[str, str]):
             status, body = fun(method, path, args, session_vars, headers)

matemat/webserver/test/test_parse_request.py

@@ -0,0 +1,347 @@
+
+import unittest
+
+from matemat.webserver.util import parse_args
+
+
+class TestParseRequest(unittest.TestCase):
+
+    def test_parse_get_root(self):
+        path, args = parse_args('/')
+        self.assertEqual('/', path)
+        self.assertEqual(0, len(args))
+
+    def test_parse_get_no_args(self):
+        path, args = parse_args('/index.html')
+        self.assertEqual('/index.html', path)
+        self.assertEqual(0, len(args))
+
+    def test_parse_get_root_getargs(self):
+        path, args = parse_args('/?foo=42&bar=1337&baz=Hello,%20World!')
+        self.assertEqual('/', path)
+        self.assertEqual(3, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('bar', args.keys())
+        self.assertIn('baz', args.keys())
+        self.assertTrue(args['foo'].is_scalar)
+        self.assertTrue(args['bar'].is_scalar)
+        self.assertTrue(args['baz'].is_scalar)
+        self.assertEqual('text/plain', args['foo'].get_content_type())
+        self.assertEqual('text/plain', args['bar'].get_content_type())
+        self.assertEqual('text/plain', args['baz'].get_content_type())
+        self.assertEqual('42', args['foo'].get_str())
+        self.assertEqual('1337', args['bar'].get_str())
+        self.assertEqual('Hello, World!', args['baz'].get_str())
+
+    def test_parse_get_getargs(self):
+        path, args = parse_args('/abc/def?foo=42&bar=1337&baz=Hello,%20World!')
+        self.assertEqual('/abc/def', path)
+        self.assertEqual(3, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('bar', args.keys())
+        self.assertIn('baz', args.keys())
+        self.assertTrue(args['foo'].is_scalar)
+        self.assertTrue(args['bar'].is_scalar)
+        self.assertTrue(args['baz'].is_scalar)
+        self.assertEqual('text/plain', args['foo'].get_content_type())
+        self.assertEqual('text/plain', args['bar'].get_content_type())
+        self.assertEqual('text/plain', args['baz'].get_content_type())
+        self.assertEqual('42', args['foo'].get_str())
+        self.assertEqual('1337', args['bar'].get_str())
+        self.assertEqual('Hello, World!', args['baz'].get_str())
+
+    def test_parse_get_getarray(self):
+        path, args = parse_args('/abc/def?foo=42&foo=1337&baz=Hello,%20World!')
+        self.assertEqual('/abc/def', path)
+        self.assertEqual(2, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('baz', args.keys())
+        self.assertTrue(args['foo'].is_array)
+        self.assertTrue(args['baz'].is_scalar)
+        self.assertEqual(2, len(args['foo']))
+        self.assertEqual('42', args['foo'].get_str(0))
+        self.assertEqual('1337', args['foo'].get_str(1))
+
+    def test_parse_get_zero_arg(self):
+        path, args = parse_args('/abc/def?foo=&bar=42')
+        self.assertEqual(2, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('bar', args.keys())
+        self.assertTrue(args['foo'].is_scalar)
+        self.assertTrue(args['bar'].is_scalar)
+        self.assertEqual(1, len(args['foo']))
+        self.assertEqual('', args['foo'].get_str())
+        self.assertEqual('42', args['bar'].get_str())
+
+    def test_parse_get_urlencoded_encoding_fail(self):
+        with self.assertRaises(ValueError):
+            parse_args('/?foo=42&bar=%80&baz=Hello,%20World!')
+
+    def test_parse_post_urlencoded(self):
+        path, args = parse_args('/',
+                                postbody=b'foo=42&bar=1337&baz=Hello,%20World!',
+                                enctype='application/x-www-form-urlencoded')
+        self.assertEqual('/', path)
+        self.assertEqual(3, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('bar', args.keys())
+        self.assertIn('baz', args.keys())
+        self.assertTrue(args['foo'].is_scalar)
+        self.assertTrue(args['bar'].is_scalar)
+        self.assertTrue(args['baz'].is_scalar)
+        self.assertEqual('text/plain', args['foo'].get_content_type())
+        self.assertEqual('text/plain', args['bar'].get_content_type())
+        self.assertEqual('text/plain', args['baz'].get_content_type())
+        self.assertEqual('42', args['foo'].get_str())
+        self.assertEqual('1337', args['bar'].get_str())
+        self.assertEqual('Hello, World!', args['baz'].get_str())
+
+    def test_parse_post_urlencoded_array(self):
+        path, args = parse_args('/',
+                                postbody=b'foo=42&foo=1337&baz=Hello,%20World!',
+                                enctype='application/x-www-form-urlencoded')
+        self.assertEqual('/', path)
+        self.assertEqual(2, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('baz', args.keys())
+        self.assertTrue(args['foo'].is_array)
+        self.assertTrue(args['baz'].is_scalar)
+        self.assertEqual(2, len(args['foo']))
+        self.assertEqual('42', args['foo'].get_str(0))
+        self.assertEqual('1337', args['foo'].get_str(1))
+
+    def test_parse_post_urlencoded_zero_arg(self):
+        path, args = parse_args('/abc/def', postbody=b'foo=&bar=42', enctype='application/x-www-form-urlencoded')
+        self.assertEqual(2, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('bar', args.keys())
+        self.assertTrue(args['foo'].is_scalar)
+        self.assertTrue(args['bar'].is_scalar)
+        self.assertEqual(1, len(args['foo']))
+        self.assertEqual('', args['foo'].get_str())
+        self.assertEqual('42', args['bar'].get_str())
+
+    def test_parse_post_urlencoded_encoding_fail(self):
+        with self.assertRaises(ValueError):
+            parse_args('/',
+                       postbody=b'foo=42&bar=%80&baz=Hello,%20World!',
+                       enctype='application/x-www-form-urlencoded')
+
+    def test_parse_post_multipart_no_args(self):
+        path, args = parse_args('/',
+                                postbody=b'--testBoundary1337--\r\n',
+                                enctype='multipart/form-data; boundary=testBoundary1337')
+        self.assertEqual('/', path)
+        self.assertEqual(0, len(args))
+
+    def test_parse_post_multipart(self):
+        path, args = parse_args('/',
+                                postbody=b'--testBoundary1337\r\n'
+                                         b'Content-Disposition: form-data; name="foo"\r\n'
+                                         b'Content-Type: text/plain\r\n\r\n'
+                                         b'42\r\n'
+                                         b'--testBoundary1337\r\n'
+                                         b'Content-Disposition: form-data; name="bar"; filename="bar.bin"\r\n'
+                                         b'Content-Type: application/octet-stream\r\n\r\n'
+                                         b'1337\r\n'
+                                         b'--testBoundary1337\r\n'
+                                         b'Content-Disposition: form-data; name="baz"\r\n'
+                                         b'Content-Type: text/plain\r\n\r\n'
+                                         b'Hello, World!\r\n'
+                                         b'--testBoundary1337--\r\n',
+                                enctype='multipart/form-data; boundary=testBoundary1337')
+        self.assertEqual('/', path)
+        self.assertEqual(3, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('bar', args.keys())
+        self.assertIn('baz', args.keys())
+        self.assertTrue(args['foo'].is_scalar)
+        self.assertTrue(args['bar'].is_scalar)
+        self.assertTrue(args['baz'].is_scalar)
+        self.assertEqual('text/plain', args['foo'].get_content_type())
+        self.assertEqual('application/octet-stream', args['bar'].get_content_type())
+        self.assertEqual('text/plain', args['baz'].get_content_type())
+        self.assertEqual('42', args['foo'].get_str())
+        self.assertEqual(b'1337', args['bar'].get_bytes())
+        self.assertEqual('Hello, World!', args['baz'].get_str())
+
+    def test_parse_post_multipart_zero_arg(self):
+        path, args = parse_args('/abc/def',
+                                postbody=b'--testBoundary1337\r\n'
+                                         b'Content-Disposition: form-data; name="foo"\r\n'
+                                         b'Content-Type: text/plain\r\n\r\n\r\n'
+                                         b'--testBoundary1337\r\n'
+                                         b'Content-Disposition: form-data; name="bar"\r\n'
+                                         b'Content-Type: text/plain\r\n\r\n'
+                                         b'42\r\n'
+                                         b'--testBoundary1337--\r\n',
+                                enctype='multipart/form-data; boundary=testBoundary1337')
+        self.assertEqual(2, len(args))
+        self.assertIn('foo', args.keys())
+        self.assertIn('bar', args.keys())
+        self.assertTrue(args['foo'].is_scalar)
+        self.assertTrue(args['bar'].is_scalar)
+        self.assertEqual(1, len(args['foo']))
+        self.assertEqual('', args['foo'].get_str())
+        self.assertEqual('42', args['bar'].get_str())
+
+    def test_parse_post_multipart_broken_boundaries(self):
+        with self.assertRaises(ValueError):
+            # Boundary not defined in Content-Type
+            parse_args('/',
+                       postbody=b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="foo"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'42\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="bar"; filename="bar.bin"\r\n'
+                                b'Content-Type: application/octet-stream\r\n\r\n'
+                                b'1337\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="baz"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'Hello, World!\r\n'
+                                b'--testBoundary1337--\r\n',
+                       enctype='multipart/form-data')
+        with self.assertRaises(ValueError):
+            # Corrupted "--" head at first boundary
+            parse_args('/',
+                       postbody=b'-+testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="foo"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'42\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="bar"; filename="bar.bin"\r\n'
+                                b'Content-Type: application/octet-stream\r\n\r\n'
+                                b'1337\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="baz"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'Hello, World!\r\n'
+                                b'--testBoundary1337--\r\n',
+                       enctype='multipart/form-data; boundary=testBoundary1337')
+        with self.assertRaises(ValueError):
+            # Missing "--" tail at end boundary
+            parse_args('/',
+                       postbody=b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="foo"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'42\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="bar"; filename="bar.bin"\r\n'
+                                b'Content-Type: application/octet-stream\r\n\r\n'
+                                b'1337\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="baz"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'Hello, World!\r\n'
+                                b'--testBoundary1337\r\n',
+                       enctype='multipart/form-data; boundary=testBoundary1337')
+        with self.assertRaises(ValueError):
+            # Missing Content-Type header in one part
+            parse_args('/',
+                       postbody=b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="foo"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'42\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="bar"; filename="bar.bin"\r\n'
+                                b'Content-Type: application/octet-stream\r\n\r\n'
+                                b'1337\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="baz"\r\n\r\n'
+                                b'Hello, World!\r\n'
+                                b'--testBoundary1337--\r\n',
+                       enctype='multipart/form-data; boundary=testBoundary1337')
+        with self.assertRaises(ValueError):
+            # Missing Content-Disposition header in one part
+            parse_args('/',
+                       postbody=b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="foo"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'42\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Type: application/octet-stream\r\n\r\n'
+                                b'1337\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="baz"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'Hello, World!\r\n'
+                                b'--testBoundary1337--\r\n',
+                       enctype='multipart/form-data; boundary=testBoundary1337')
+        with self.assertRaises(ValueError):
+            # Missing form-data name argument
+            parse_args('/',
+                       postbody=b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="foo"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'42\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; filename="bar.bin"\r\n'
+                                b'Content-Type: application/octet-stream\r\n\r\n'
+                                b'1337\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="baz"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'Hello, World!\r\n'
+                                b'--testBoundary1337--\r\n',
+                       enctype='multipart/form-data; boundary=testBoundary1337')
+        with self.assertRaises(ValueError):
+            # Unknown Content-Disposition
+            parse_args('/',
+                       postbody=b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="foo"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'42\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: attachment; name="bar"; filename="bar.bin"\r\n'
+                                b'Content-Type: application/octet-stream\r\n\r\n'
+                                b'1337\r\n'
+                                b'--testBoundary1337\r\n'
+                                b'Content-Disposition: form-data; name="baz"\r\n'
+                                b'Content-Type: text/plain\r\n\r\n'
+                                b'Hello, World!\r\n'
+                                b'--testBoundary1337--\r\n',
+                       enctype='multipart/form-data; boundary=testBoundary1337')
+
+    def test_get_post_precedence_urlencoded(self):
+        path, args = parse_args('/foo?foo=thisshouldnotbethere&bar=isurvived',
+                                postbody=b'foo=42&foo=1337&baz=Hello,%20World!',
+                                enctype='application/x-www-form-urlencoded')
+        self.assertIn('foo', args)
+        self.assertIn('bar', args)
+        self.assertIn('baz', args)
+        self.assertEqual(2, len(args['foo']))
+        self.assertEqual(1, len(args['bar']))
+        self.assertEqual(1, len(args['baz']))
+        self.assertEqual('42', args['foo'].get_str(0))
+        self.assertEqual('1337', args['foo'].get_str(1))
+        self.assertEqual('isurvived', args['bar'].get_str())
+        self.assertEqual('Hello, World!', args['baz'].get_str())
+
+    def test_get_post_precedence_multipart(self):
+        path, args = parse_args('/foo?foo=thisshouldnotbethere&bar=isurvived',
+                                postbody=b'--testBoundary1337\r\n'
+                                         b'Content-Disposition: form-data; name="foo"\r\n'
+                                         b'Content-Type: text/plain\r\n\r\n'
+                                         b'42\r\n'
+                                         b'--testBoundary1337\r\n'
+                                         b'Content-Disposition: form-data; name="foo"; filename="bar.bin"\r\n'
+                                         b'Content-Type: text/plain\r\n\r\n'
+                                         b'1337\r\n'
+                                         b'--testBoundary1337\r\n'
+                                         b'Content-Disposition: form-data; name="baz"\r\n'
+                                         b'Content-Type: text/plain\r\n\r\n'
+                                         b'Hello, World!\r\n'
+                                         b'--testBoundary1337--\r\n',
+                                enctype='multipart/form-data; boundary=testBoundary1337')
+        self.assertIn('foo', args)
+        self.assertIn('bar', args)
+        self.assertIn('baz', args)
+        self.assertEqual(2, len(args['foo']))
+        self.assertEqual(1, len(args['bar']))
+        self.assertEqual(1, len(args['baz']))
+        self.assertEqual('42', args['foo'].get_str(0))
+        self.assertEqual('1337', args['foo'].get_str(1))
+        self.assertEqual('isurvived', args['bar'].get_str())
+        self.assertEqual('Hello, World!', args['baz'].get_str())

matemat/webserver/test/test_post.py

@@ -1,7 +1,7 @@
 
 from typing import Any, Dict, List,  Tuple, Union
 
-from matemat.webserver.httpd import HttpHandler
+from matemat.webserver import HttpHandler, RequestArgument
 from matemat.webserver.test.abstract_httpd_test import AbstractHttpdTest, test_pagelet
 
 import codecs
@@ -10,7 +10,7 @@ import codecs
 @test_pagelet('/just/testing/post')
 def post_test_pagelet(method: str,
                       path: str,
-                      args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]],
+                      args: Dict[str, RequestArgument],
                       session_vars: Dict[str, Any],
                       headers: Dict[str, str]):
     """
@@ -18,13 +18,12 @@ def post_test_pagelet(method: str,
     """
     headers['Content-Type'] = 'text/plain'
     dump: str = ''
-    for k, (t, v) in args.items():
-        if t.startswith('text/'):
-            if isinstance(v, bytes):
-                v = v.decode('utf-8')
-            dump += f'{k}: {",".join(v) if isinstance(v, list) else v}\n'
+    for k, ra in args.items():
+        for a in ra:
+            if a.get_content_type().startswith('text/'):
+                dump += f'{k}: {a.get_str()}\n'
             else:
-            dump += f'{k}: {codecs.encode(v, "hex").decode("utf-8")}\n'
+                dump += f'{k}: {codecs.encode(a.get_bytes(), "hex").decode("utf-8")}\n'
     return 200, dump
 
 
@@ -118,10 +117,14 @@ class TestPost(AbstractHttpdTest):
         kv: Dict[str, str] = dict()
         for l in lines:
             k, v = l.decode('utf-8').split(':', 1)
-            kv[k.strip()] = v.strip() if ',' not in v else v.strip().split(',')
-
+            k = k.strip()
+            v = v.strip()
+            if k in kv:
+                kv[k] += f',{v}'
+            else:
+                kv[k] = v
         # Make sure the arguments were properly parsed
-        self.assertListEqual(['bar', 'baz'], kv['foo'])
+        self.assertEqual('bar,baz', kv['foo'])
         self.assertEqual('1', kv['test'])
 
     def test_post_urlenc_post_array(self):
@@ -141,10 +144,14 @@ class TestPost(AbstractHttpdTest):
         kv: Dict[str, str] = dict()
         for l in lines:
             k, v = l.decode('utf-8').split(':', 1)
-            kv[k.strip()] = v.strip() if ',' not in v else v.strip().split(',')
-
+            k = k.strip()
+            v = v.strip()
+            if k in kv:
+                kv[k] += f',{v}'
+            else:
+                kv[k] = v
         # Make sure the arguments were properly parsed
-        self.assertListEqual(['bar', 'baz'], kv['foo'])
+        self.assertEqual('bar,baz', kv['foo'])
         self.assertEqual('1', kv['test'])
 
     def test_post_urlenc_mixed_array(self):
@@ -164,12 +171,16 @@ class TestPost(AbstractHttpdTest):
         kv: Dict[str, str] = dict()
         for l in lines:
             k, v = l.decode('utf-8').split(':', 1)
-            kv[k.strip()] = v.strip() if ',' not in v else v.strip().split(',')
-
+            k = k.strip()
+            v = v.strip()
+            if k in kv:
+                kv[k] += f',{v}'
+            else:
+                kv[k] = v
         # Make sure the arguments were properly parsed
-        self.assertListEqual(['postbar', 'postbaz'], kv['foo'])
-        self.assertListEqual(['1', '42'], kv['gettest'])
-        self.assertListEqual(['1', '2'], kv['posttest'])
+        self.assertEqual('postbar,postbaz', kv['foo'])
+        self.assertEqual('1,42', kv['gettest'])
+        self.assertEqual('1,2', kv['posttest'])
 
     def test_post_no_body(self):
         """
@@ -184,7 +195,7 @@ class TestPost(AbstractHttpdTest):
 
     def test_post_multipart_post_only(self):
         """
-        Test a POST request with a miltipart/form-data body.
+        Test a POST request with a miutipart/form-data body.
         """
         # Send POST request
         formdata = (b'------testboundary\r\n'
@@ -211,34 +222,3 @@ class TestPost(AbstractHttpdTest):
         self.assertIn('bar', kv)
         self.assertEqual(kv['foo'], b'Hello, World!')
         self.assertEqual(kv['bar'], b'00010203040506070809800b0c730e0f')
-
-    def test_post_multipart_mixed(self):
-        """
-        Test a POST request with a miltipart/form-data body.
-        """
-        # Send POST request
-        formdata = (b'------testboundary\r\n'
-                    b'Content-Disposition: form-data; name="foo"\r\n'
-                    b'Content-Type: text/plain\r\n\r\n'
-                    b'Hello, World!\r\n'
-                    b'------testboundary\r\n'
-                    b'Content-Disposition: form-data; name="bar"; filename="foo.bar"\r\n'
-                    b'Content-Type: application/octet-stream\r\n\r\n'
-                    b'\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x80\x0b\x0c\x73\x0e\x0f\r\n'
-                    b'------testboundary--\r\n')
-
-        self.client_sock.set_request(f'POST /just/testing/post?getfoo=bar&foo=thisshouldbegone HTTP/1.1\r\n'
-                                     f'Content-Type: multipart/form-data; boundary=----testboundary\r\n'
-                                     f'Content-Length: {len(formdata)}\r\n\r\n'.encode('utf-8') + formdata)
-        HttpHandler(self.client_sock, ('::1', 45678), self.server)
-        packet = self.client_sock.get_response()
-        lines: List[bytes] = packet.body.split(b'\n')[:-1]
-        kv: Dict[str, Any] = dict()
-        for l in lines:
-            k, v = l.split(b':', 1)
-            kv[k.decode('utf-8').strip()] = v.strip()
-        self.assertIn('foo', kv)
-        self.assertIn('bar', kv)
-        self.assertEqual(kv['getfoo'], b'bar')
-        self.assertEqual(kv['foo'], b'Hello, World!')
-        self.assertEqual(kv['bar'], b'00010203040506070809800b0c730e0f')

matemat/webserver/test/test_requestargs.py

@@ -0,0 +1,204 @@
+
+from typing import List
+
+import unittest
+
+from matemat.webserver import RequestArgument
+# noinspection PyProtectedMember
+from matemat.webserver.requestargs import _View
+
+
+class TestRequestArguments(unittest.TestCase):
+
+    def test_create_default(self):
+        ra = RequestArgument('foo')
+        self.assertEqual('foo', ra.name)
+        self.assertEqual(0, len(ra))
+        self.assertFalse(ra.is_scalar)
+        self.assertTrue(ra.is_array)
+        self.assertFalse(ra.is_view)
+
+    def test_create_str_scalar(self):
+        ra = RequestArgument('foo', ('text/plain', 'bar'))
+        self.assertEqual('foo', ra.name)
+        self.assertEqual(1, len(ra))
+        self.assertTrue(ra.is_scalar)
+        self.assertFalse(ra.is_array)
+        self.assertEqual('bar', ra.get_str())
+        self.assertEqual(b'bar', ra.get_bytes())
+        self.assertEqual('text/plain', ra.get_content_type())
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_str(0))
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_bytes(0))
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_content_type(0))
+        self.assertFalse(ra.is_view)
+
+    def test_create_str_scalar_array(self):
+        ra = RequestArgument('foo', [('text/plain', 'bar')])
+        self.assertEqual('foo', ra.name)
+        self.assertEqual(1, len(ra))
+        self.assertTrue(ra.is_scalar)
+        self.assertFalse(ra.is_array)
+        self.assertEqual('bar', ra.get_str())
+        self.assertEqual(b'bar', ra.get_bytes())
+        self.assertEqual('text/plain', ra.get_content_type())
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_str(0))
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_bytes(0))
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_content_type(0))
+        self.assertFalse(ra.is_view)
+
+    def test_create_bytes_scalar(self):
+        ra = RequestArgument('foo', ('application/octet-stream', b'\x00\x80\xff\xfe'))
+        self.assertEqual('foo', ra.name)
+        self.assertEqual(1, len(ra))
+        self.assertTrue(ra.is_scalar)
+        self.assertFalse(ra.is_array)
+        with self.assertRaises(UnicodeDecodeError):
+            ra.get_str()
+        self.assertEqual(b'\x00\x80\xff\xfe', ra.get_bytes())
+        self.assertEqual('application/octet-stream', ra.get_content_type())
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_str(0))
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_bytes(0))
+        with self.assertRaises(ValueError):
+            self.assertEqual('bar', ra.get_content_type(0))
+        self.assertFalse(ra.is_view)
+
+    def test_create_array(self):
+        ra = RequestArgument('foo', [
+            ('text/plain', 'bar'),
+            ('application/octet-stream', b'\x00\x80\xff\xfe')
+        ])
+        self.assertEqual('foo', ra.name)
+        self.assertEqual(2, len(ra))
+        self.assertFalse(ra.is_scalar)
+        self.assertTrue(ra.is_array)
+        with self.assertRaises(ValueError):
+            ra.get_str()
+        with self.assertRaises(ValueError):
+            ra.get_bytes()
+        with self.assertRaises(ValueError):
+            ra.get_content_type()
+        self.assertEqual('bar', ra.get_str(0))
+        self.assertEqual(b'bar', ra.get_bytes(0))
+        self.assertEqual('text/plain', ra.get_content_type(0))
+        with self.assertRaises(UnicodeDecodeError):
+            ra.get_str(1)
+        self.assertEqual(b'\x00\x80\xff\xfe', ra.get_bytes(1))
+        self.assertEqual('application/octet-stream', ra.get_content_type(1))
+        self.assertFalse(ra.is_view)
+
+    def test_append_empty_str(self):
+        ra = RequestArgument('foo')
+        self.assertEqual(0, len(ra))
+        self.assertFalse(ra.is_scalar)
+
+        ra.append('text/plain', 'bar')
+        self.assertEqual(1, len(ra))
+        self.assertTrue(ra.is_scalar)
+        self.assertEqual('bar', ra.get_str())
+        self.assertEqual(b'bar', ra.get_bytes())
+        self.assertEqual('text/plain', ra.get_content_type())
+        self.assertFalse(ra.is_view)
+
+    def test_append_empty_bytes(self):
+        ra = RequestArgument('foo')
+        self.assertEqual(0, len(ra))
+        self.assertFalse(ra.is_scalar)
+
+        ra.append('application/octet-stream', b'\x00\x80\xff\xfe')
+        self.assertEqual(1, len(ra))
+        self.assertTrue(ra.is_scalar)
+        with self.assertRaises(UnicodeDecodeError):
+            ra.get_str()
+        self.assertEqual(b'\x00\x80\xff\xfe', ra.get_bytes())
+        self.assertEqual('application/octet-stream', ra.get_content_type())
+        self.assertFalse(ra.is_view)
+
+    def test_append_multiple(self):
+        ra = RequestArgument('foo')
+        self.assertEqual(0, len(ra))
+        self.assertFalse(ra.is_scalar)
+
+        ra.append('text/plain', 'bar')
+        self.assertEqual(1, len(ra))
+        self.assertTrue(ra.is_scalar)
+
+        ra.append('application/octet-stream', b'\x00\x80\xff\xfe')
+        self.assertEqual(2, len(ra))
+        self.assertFalse(ra.is_scalar)
+
+        ra.append('text/plain', 'Hello, World!')
+        self.assertEqual(3, len(ra))
+        self.assertFalse(ra.is_scalar)
+
+    def test_iterate_empty(self):
+        ra = RequestArgument('foo')
+        self.assertEqual(0, len(ra))
+        for _ in ra:
+            self.fail()
+
+    def test_iterate_scalar(self):
+        ra = RequestArgument('foo', ('text/plain', 'bar'))
+        self.assertTrue(ra.is_scalar)
+        count: int = 0
+        for it in ra:
+            self.assertIsInstance(it, _View)
+            self.assertEqual('foo', it.name)
+            self.assertTrue(it.is_view)
+            self.assertTrue(it.is_scalar)
+            count += 1
+        self.assertEqual(1, count)
+
+    def test_iterate_array(self):
+        ra = RequestArgument('foo', [('text/plain', 'bar'), ('abc', b'def'), ('xyz', '1337')])
+        self.assertFalse(ra.is_scalar)
+        items: List[str] = list()
+        for it in ra:
+            self.assertIsInstance(it, _View)
+            self.assertTrue(it.is_view)
+            self.assertTrue(it.is_scalar)
+            items.append(it.get_content_type())
+        self.assertEqual(['text/plain', 'abc', 'xyz'], items)
+
+    def test_iterate_sliced(self):
+        ra = RequestArgument('foo', [('a', 'b'), ('c', 'd'), ('e', 'f'), ('g', 'h'), ('i', 'j'), ('k', 'l')])
+        self.assertFalse(ra.is_scalar)
+        items: List[str] = list()
+        for it in ra[1:4:2]:
+            self.assertIsInstance(it, _View)
+            self.assertTrue(it.is_view)
+            self.assertTrue(it.is_scalar)
+            items.append(it.get_content_type())
+        self.assertEqual(['c', 'g'], items)
+
+    def test_index_scalar(self):
+        ra = RequestArgument('foo', ('bar', 'baz'))
+        it = ra[0]
+        self.assertIsInstance(it, _View)
+        self.assertEqual('foo', it.name)
+        self.assertEqual('bar', it.get_content_type())
+        self.assertEqual('baz', it.get_str())
+        with self.assertRaises(ValueError):
+            _ = ra[1]
+
+    def test_index_array(self):
+        ra = RequestArgument('foo', [('a', 'b'), ('c', 'd')])
+        it = ra[1]
+        self.assertIsInstance(it, _View)
+        self.assertEqual('foo', it.name)
+        self.assertEqual('c', it.get_content_type())
+        self.assertEqual('d', it.get_str())
+
+    def test_view_immutable(self):
+        ra = RequestArgument('foo', ('bar', 'baz'))
+        it = ra[0]
+        self.assertIsInstance(it, _View)
+        with self.assertRaises(TypeError):
+            it.append('foo', 'bar')

matemat/webserver/test/test_serve.py

@@ -3,14 +3,14 @@ from typing import Any, Dict, Union
 
 import os
 import os.path
-from matemat.webserver.httpd import HttpHandler
+from matemat.webserver import HttpHandler, RequestArgument
 from matemat.webserver.test.abstract_httpd_test import AbstractHttpdTest, test_pagelet
 
 
 @test_pagelet('/just/testing/serve_pagelet_ok')
 def serve_test_pagelet_ok(method: str,
                           path: str,
-                          args: Dict[str, Union[bytes, str]],
+                          args: Dict[str, RequestArgument],
                           session_vars: Dict[str, Any],
                           headers: Dict[str, str]):
     headers['Content-Type'] = 'text/plain'
@@ -20,7 +20,7 @@ def serve_test_pagelet_ok(method: str,
 @test_pagelet('/just/testing/serve_pagelet_fail')
 def serve_test_pagelet_fail(method: str,
                             path: str,
-                            args: Dict[str, Union[bytes, str]],
+                            args: Dict[str, RequestArgument],
                             session_vars: Dict[str, Any],
                             headers: Dict[str, str]):
     session_vars['test'] = 'hello, world!'

matemat/webserver/test/test_session.py

@@ -4,14 +4,14 @@ from typing import Any, Dict, Union
 from datetime import datetime, timedelta
 from time import sleep
 
-from matemat.webserver.httpd import HttpHandler
+from matemat.webserver import HttpHandler, RequestArgument
 from matemat.webserver.test.abstract_httpd_test import AbstractHttpdTest, test_pagelet
 
 
 @test_pagelet('/just/testing/sessions')
 def session_test_pagelet(method: str,
                          path: str,
-                         args: Dict[str, Union[bytes, str]],
+                         args: Dict[str, RequestArgument],
                          session_vars: Dict[str, Any],
                          headers: Dict[str, str]):
     session_vars['test'] = 'hello, world!'

matemat/webserver/util.py

@@ -3,8 +3,10 @@ from typing import Dict, List, Tuple, Optional, Union
 
 import urllib.parse
 
+from matemat.webserver import RequestArgument
 
-def _parse_multipart(body: bytes, boundary: str) -> Dict[str, List[Tuple[str, Union[bytes, str]]]]:
+
+def _parse_multipart(body: bytes, boundary: str) -> List[RequestArgument]:
     """
     Given a HTTP body with form-data in multipart form, and the multipart-boundary, parse the multipart items and
     return them as a dictionary.
@@ -13,6 +15,8 @@ def _parse_multipart(body: bytes, boundary: str) -> Dict[str, List[Tuple[str, Un
     :param boundary: The multipart boundary.
     :return: A dictionary of field names as key, and content types and field values as value.
     """
+    # Prepend a CRLF for the first boundary to match
+    body = b'\r\n' + body
     # Generate item header boundary and terminating boundary from general boundary string
     _boundary = f'\r\n--{boundary}\r\n'.encode('utf-8')
     _end_boundary = f'\r\n--{boundary}--\r\n'.encode('utf-8')
@@ -20,16 +24,15 @@ def _parse_multipart(body: bytes, boundary: str) -> Dict[str, List[Tuple[str, Un
     allparts = body.split(_end_boundary, 1)
     if len(allparts) != 2 or allparts[1] != b'':
         raise ValueError('Last boundary missing or corrupted')
-    # Split remaining body into its parts (appending a CRLF for the first boundary to match), and verify at least 1 part
-    # is there
-    parts: List[bytes] = (b'\r\n' + allparts[0]).split(_boundary)
+    # Split remaining body into its parts, and verify at least 1 part is there
+    parts: List[bytes] = (allparts[0]).split(_boundary)
     if len(parts) < 1 or parts[0] != b'':
         raise ValueError('First boundary missing or corrupted')
     # Remove the first, empty part
     parts = parts[1:]
 
     # Results go into this dict
-    args: Dict[str, List[Tuple[str, Union[bytes, str]]]] = dict()
+    args: Dict[str, RequestArgument] = dict()
 
     # Parse each multipart part
     for part in parts:
@@ -50,25 +53,29 @@ def _parse_multipart(body: bytes, boundary: str) -> Dict[str, List[Tuple[str, Un
         cd, *cdargs = hdr['Content-Disposition'].split(';')
         # Content-Disposition MUST be form-data; everything else is rejected
         if cd.strip() != 'form-data':
-            raise ValueError(f'Unknown Content-Disposition: cd')
+            raise ValueError(f'Unknown Content-Disposition: {cd}')
         # Extract the "name" header argument
+        has_name = False
         for cdarg in cdargs:
             k, v = cdarg.split('=', 1)
             if k.strip() == 'name':
+                has_name = True
                 name: str = v.strip()
                 # Remove quotation marks around the name value
                 if name.startswith('"') and name.endswith('"'):
                     name = v[1:-1]
                 # Add the Content-Type and the content to the header, with the provided name
                 if name not in args:
-                    args[name] = list()
-                args[name].append((hdr['Content-Type'].strip(), part))
+                    args[name] = RequestArgument(name)
+                args[name].append(hdr['Content-Type'].strip(), part)
+        if not has_name:
+            raise ValueError('mutlipart/form-data part without name attribute')
 
-    return args
+    return list(args.values())
 
 
 def parse_args(request: str, postbody: Optional[bytes] = None, enctype: str = 'text/plain') \
-        -> Tuple[str, Dict[str, Tuple[str, Union[bytes, str, List[str]]]]]:
+        -> Tuple[str, Dict[str, RequestArgument]]:
     """
     Given a HTTP request path, and optionally a HTTP POST body in application/x-www-form-urlencoded or
     multipart/form-data form, parse the arguments and return them as a dictionary.
@@ -85,34 +92,41 @@ def parse_args(request: str, postbody: Optional[bytes] = None, enctype: str = 't
     # Parse the request "URL" (i.e. only the path)
     tokens = urllib.parse.urlparse(request)
     # Parse the GET arguments
-    getargs = urllib.parse.parse_qs(tokens.query)
+    if len(tokens.query) == 0:
+        getargs = dict()
+    else:
+        getargs = urllib.parse.parse_qs(tokens.query, strict_parsing=True, keep_blank_values=True, errors='strict')
 
-    # TODO: { 'foo': [ ('text/plain', 'bar'), ('application/octet-stream', '\x80') ] }
-    # TODO: Use a @dataclass once Python 3.7 is out
-    args: Dict[str, Tuple[str, Union[bytes, str, List[str]]]] = dict()
+    args: Dict[str, RequestArgument] = dict()
     for k, v in getargs.items():
-        args[k] = 'text/plain', v
+        args[k] = RequestArgument(k)
+        for _v in v:
+            args[k].append('text/plain', _v)
 
     if postbody is not None:
         if enctype == 'application/x-www-form-urlencoded':
             # Parse the POST body
-            postargs = urllib.parse.parse_qs(postbody.decode('utf-8'))
+            pb: str = postbody.decode('utf-8')
+            if len(pb) == 0:
+                postargs = dict()
+            else:
+                postargs = urllib.parse.parse_qs(pb, strict_parsing=True, keep_blank_values=True, errors='strict')
             # Write all POST values into the dict, overriding potential duplicates from GET
             for k, v in postargs.items():
-                args[k] = 'text/plain', v
+                args[k] = RequestArgument(k)
+                for _v in v:
+                    args[k].append('text/plain', _v)
         elif enctype.startswith('multipart/form-data'):
             # Parse the multipart boundary from the Content-Type header
-            boundary: str = enctype.split('boundary=')[1]
+            try:
+                boundary: str = enctype.split('boundary=')[1].strip()
+            except IndexError:
+                raise ValueError('Multipart boundary in header not set or corrupted')
             # Parse the multipart body
             mpargs = _parse_multipart(postbody, boundary)
-            for k, v in mpargs.items():
-                # TODO: Process all values, not just the first
-                args[k] = v[0]
+            for ra in mpargs:
+                args[ra.name] = ra
         else:
             raise ValueError(f'Unsupported Content-Type: {enctype}')
-    # urllib.parse.parse_qs turns ALL arguments into arrays.  This turns arrays of length 1 into scalar values
-    for (k, (ct, v)) in args.items():
-        if len(v) == 1:
-            args[k] = ct, v[0]
     # Return the path and the parsed arguments
     return tokens.path, args