bundling required python dependencies, to make it easier on Tails users

lib/flask/wrappers.py

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+# -*- coding: utf-8 -*-
+"""
+    flask.wrappers
+    ~~~~~~~~~~~~~~
+
+    Implements the WSGI wrappers (request and response).
+
+    :copyright: (c) 2011 by Armin Ronacher.
+    :license: BSD, see LICENSE for more details.
+"""
+
+from werkzeug.wrappers import Request as RequestBase, Response as ResponseBase
+from werkzeug.exceptions import BadRequest
+
+from .debughelpers import attach_enctype_error_multidict
+from . import json
+from .globals import _request_ctx_stack
+
+
+_missing = object()
+
+
+def _get_data(req, cache):
+    getter = getattr(req, 'get_data', None)
+    if getter is not None:
+        return getter(cache=cache)
+    return req.data
+
+
+class Request(RequestBase):
+    """The request object used by default in Flask.  Remembers the
+    matched endpoint and view arguments.
+
+    It is what ends up as :class:`~flask.request`.  If you want to replace
+    the request object used you can subclass this and set
+    :attr:`~flask.Flask.request_class` to your subclass.
+
+    The request object is a :class:`~werkzeug.wrappers.Request` subclass and
+    provides all of the attributes Werkzeug defines plus a few Flask
+    specific ones.
+    """
+
+    #: the internal URL rule that matched the request.  This can be
+    #: useful to inspect which methods are allowed for the URL from
+    #: a before/after handler (``request.url_rule.methods``) etc.
+    #:
+    #: .. versionadded:: 0.6
+    url_rule = None
+
+    #: a dict of view arguments that matched the request.  If an exception
+    #: happened when matching, this will be `None`.
+    view_args = None
+
+    #: if matching the URL failed, this is the exception that will be
+    #: raised / was raised as part of the request handling.  This is
+    #: usually a :exc:`~werkzeug.exceptions.NotFound` exception or
+    #: something similar.
+    routing_exception = None
+
+    # switched by the request context until 1.0 to opt in deprecated
+    # module functionality
+    _is_old_module = False
+
+    @property
+    def max_content_length(self):
+        """Read-only view of the `MAX_CONTENT_LENGTH` config key."""
+        ctx = _request_ctx_stack.top
+        if ctx is not None:
+            return ctx.app.config['MAX_CONTENT_LENGTH']
+
+    @property
+    def endpoint(self):
+        """The endpoint that matched the request.  This in combination with
+        :attr:`view_args` can be used to reconstruct the same or a
+        modified URL.  If an exception happened when matching, this will
+        be `None`.
+        """
+        if self.url_rule is not None:
+            return self.url_rule.endpoint
+
+    @property
+    def module(self):
+        """The name of the current module if the request was dispatched
+        to an actual module.  This is deprecated functionality, use blueprints
+        instead.
+        """
+        from warnings import warn
+        warn(DeprecationWarning('modules were deprecated in favor of '
+                                'blueprints.  Use request.blueprint '
+                                'instead.'), stacklevel=2)
+        if self._is_old_module:
+            return self.blueprint
+
+    @property
+    def blueprint(self):
+        """The name of the current blueprint"""
+        if self.url_rule and '.' in self.url_rule.endpoint:
+            return self.url_rule.endpoint.rsplit('.', 1)[0]
+
+    @property
+    def json(self):
+        """If the mimetype is `application/json` this will contain the
+        parsed JSON data.  Otherwise this will be `None`.
+
+        The :meth:`get_json` method should be used instead.
+        """
+        # XXX: deprecate property
+        return self.get_json()
+
+    def get_json(self, force=False, silent=False, cache=True):
+        """Parses the incoming JSON request data and returns it.  If
+        parsing fails the :meth:`on_json_loading_failed` method on the
+        request object will be invoked.  By default this function will
+        only load the json data if the mimetype is ``application/json``
+        but this can be overriden by the `force` parameter.
+
+        :param force: if set to `True` the mimetype is ignored.
+        :param silent: if set to `False` this method will fail silently
+                       and return `False`.
+        :param cache: if set to `True` the parsed JSON data is remembered
+                      on the request.
+        """
+        rv = getattr(self, '_cached_json', _missing)
+        if rv is not _missing:
+            return rv
+
+        if self.mimetype != 'application/json' and not force:
+            return None
+
+        # We accept a request charset against the specification as
+        # certain clients have been using this in the past.  This
+        # fits our general approach of being nice in what we accept
+        # and strict in what we send out.
+        request_charset = self.mimetype_params.get('charset')
+        try:
+            data = _get_data(self, cache)
+            if request_charset is not None:
+                rv = json.loads(data, encoding=request_charset)
+            else:
+                rv = json.loads(data)
+        except ValueError as e:
+            if silent:
+                rv = None
+            else:
+                rv = self.on_json_loading_failed(e)
+        if cache:
+            self._cached_json = rv
+        return rv
+
+    def on_json_loading_failed(self, e):
+        """Called if decoding of the JSON data failed.  The return value of
+        this method is used by :meth:`get_json` when an error occurred.  The
+        default implementation just raises a :class:`BadRequest` exception.
+
+        .. versionchanged:: 0.10
+           Removed buggy previous behavior of generating a random JSON
+           response.  If you want that behavior back you can trivially
+           add it by subclassing.
+
+        .. versionadded:: 0.8
+        """
+        raise BadRequest()
+
+    def _load_form_data(self):
+        RequestBase._load_form_data(self)
+
+        # in debug mode we're replacing the files multidict with an ad-hoc
+        # subclass that raises a different error for key errors.
+        ctx = _request_ctx_stack.top
+        if ctx is not None and ctx.app.debug and \
+           self.mimetype != 'multipart/form-data' and not self.files:
+            attach_enctype_error_multidict(self)
+
+
+class Response(ResponseBase):
+    """The response object that is used by default in Flask.  Works like the
+    response object from Werkzeug but is set to have an HTML mimetype by
+    default.  Quite often you don't have to create this object yourself because
+    :meth:`~flask.Flask.make_response` will take care of that for you.
+
+    If you want to replace the response object used you can subclass this and
+    set :attr:`~flask.Flask.response_class` to your subclass.
+    """
+    default_mimetype = 'text/html'