build: Using werkzeug library (#264)

* Using werkzeug library

* Updating build templates

* Added a venv

* Fixed indentation

* Changed to editable install

* Installing werkzeug directly

* Updated dependencies based on version

* Adding werkzeug in tests pipelines

* Updated tests pipeline

* Added pyproject.toml

* Updated build files

* Added missing dependency

* Updated verion in pyproject

* Updated http_wsgi

* Fixed http test error

* Minor fixes and refactoring

* Flake8 fixes

Author: gavin-aguiar

azure/functions/_abc.py

@@ -7,7 +7,7 @@
 import threading
 import typing
 
-from azure.functions._thirdparty.werkzeug.datastructures import Headers
+from werkzeug.datastructures import Headers
 
 T = typing.TypeVar('T')
 

azure/functions/_http.py

@@ -8,11 +8,12 @@
 import types
 import typing
 
+from werkzeug import formparser as _wk_parser
+from werkzeug import http as _wk_http
+from werkzeug.datastructures import (Headers, FileStorage, MultiDict,
+                                     ImmutableMultiDict)
+
 from . import _abc
-from ._thirdparty.werkzeug import datastructures as _wk_datastructures
-from ._thirdparty.werkzeug import formparser as _wk_parser
-from ._thirdparty.werkzeug import http as _wk_http
-from ._thirdparty.werkzeug.datastructures import Headers
 
 
 class BaseHeaders(collections.abc.Mapping):
@@ -174,8 +175,8 @@ def __init__(self,
         self.__route_params = types.MappingProxyType(route_params or {})
         self.__body_bytes = body
         self.__form_parsed = False
-        self.__form = None
-        self.__files = None
+        self.__form: MultiDict[str, str]
+        self.__files: MultiDict[str, FileStorage]
 
     @property
     def url(self):
@@ -222,12 +223,9 @@ def _parse_form_data(self):
         content_length = len(body)
         mimetype, options = _wk_http.parse_options_header(content_type)
         parser = _wk_parser.FormDataParser(
-            _wk_parser.default_stream_factory,
-            options.get('charset') or 'utf-8',
-            'replace',
-            None,
-            None,
-            _wk_datastructures.ImmutableMultiDict,
+            _wk_parser.default_stream_factory, max_form_memory_size=None,
+            max_content_length=None,
+            cls=ImmutableMultiDict
         )
 
         body_stream = io.BytesIO(body)

azure/functions/_http_wsgi.py

@@ -1,15 +1,18 @@
 # Copyright (c) Microsoft Corporation. All rights reserved.
 # Licensed under the MIT License.
-from typing import Dict, List, Optional, Any
 import logging
 from io import BytesIO, StringIO
 from os import linesep
+from typing import Dict, List, Optional, Any
 from urllib.parse import ParseResult, urlparse, unquote_to_bytes
 from wsgiref.headers import Headers
 
 from ._abc import Context
 from ._http import HttpRequest, HttpResponse
-from ._thirdparty.werkzeug._compat import string_types, wsgi_encoding_dance
+
+
+def wsgi_encoding_dance(value):
+    return value.encode().decode("latin1")
 
 
 class WsgiRequest:
@@ -98,7 +101,7 @@ def to_environ(self, errors_buffer: StringIO) -> Dict[str, Any]:
 
         # Ensure WSGI string fits in IOS-8859-1 code points
         for k, v in environ.items():
-            if isinstance(v, string_types):
+            if isinstance(v, (str,)):
                 environ[k] = wsgi_encoding_dance(v)
 
         # Remove None values