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323 lines
12 KiB
323 lines
12 KiB
5 years ago
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from datetime import datetime
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from datetime import timedelta
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from .._compat import string_types
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from ..datastructures import CallbackDict
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from ..http import dump_age
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from ..http import dump_header
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from ..http import dump_options_header
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from ..http import http_date
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from ..http import parse_age
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from ..http import parse_date
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from ..http import parse_options_header
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from ..http import parse_set_header
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from ..utils import cached_property
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from ..utils import environ_property
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from ..utils import get_content_type
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from ..utils import header_property
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from ..wsgi import get_content_length
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class CommonRequestDescriptorsMixin(object):
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"""A mixin for :class:`BaseRequest` subclasses. Request objects that
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mix this class in will automatically get descriptors for a couple of
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HTTP headers with automatic type conversion.
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.. versionadded:: 0.5
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"""
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content_type = environ_property(
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"CONTENT_TYPE",
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doc="""The Content-Type entity-header field indicates the media
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type of the entity-body sent to the recipient or, in the case of
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the HEAD method, the media type that would have been sent had
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the request been a GET.""",
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)
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@cached_property
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def content_length(self):
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"""The Content-Length entity-header field indicates the size of the
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entity-body in bytes or, in the case of the HEAD method, the size of
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the entity-body that would have been sent had the request been a
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GET.
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"""
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return get_content_length(self.environ)
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content_encoding = environ_property(
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"HTTP_CONTENT_ENCODING",
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doc="""The Content-Encoding entity-header field is used as a
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modifier to the media-type. When present, its value indicates
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what additional content codings have been applied to the
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entity-body, and thus what decoding mechanisms must be applied
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in order to obtain the media-type referenced by the Content-Type
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header field.
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.. versionadded:: 0.9""",
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)
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content_md5 = environ_property(
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"HTTP_CONTENT_MD5",
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doc="""The Content-MD5 entity-header field, as defined in
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RFC 1864, is an MD5 digest of the entity-body for the purpose of
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providing an end-to-end message integrity check (MIC) of the
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entity-body. (Note: a MIC is good for detecting accidental
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modification of the entity-body in transit, but is not proof
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against malicious attacks.)
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.. versionadded:: 0.9""",
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)
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referrer = environ_property(
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"HTTP_REFERER",
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doc="""The Referer[sic] request-header field allows the client
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to specify, for the server's benefit, the address (URI) of the
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resource from which the Request-URI was obtained (the
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"referrer", although the header field is misspelled).""",
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)
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date = environ_property(
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"HTTP_DATE",
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None,
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parse_date,
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doc="""The Date general-header field represents the date and
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time at which the message was originated, having the same
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semantics as orig-date in RFC 822.""",
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)
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max_forwards = environ_property(
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"HTTP_MAX_FORWARDS",
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None,
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int,
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doc="""The Max-Forwards request-header field provides a
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mechanism with the TRACE and OPTIONS methods to limit the number
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of proxies or gateways that can forward the request to the next
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inbound server.""",
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)
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def _parse_content_type(self):
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if not hasattr(self, "_parsed_content_type"):
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self._parsed_content_type = parse_options_header(
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self.environ.get("CONTENT_TYPE", "")
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)
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@property
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def mimetype(self):
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"""Like :attr:`content_type`, but without parameters (eg, without
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charset, type etc.) and always lowercase. For example if the content
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type is ``text/HTML; charset=utf-8`` the mimetype would be
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``'text/html'``.
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"""
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self._parse_content_type()
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return self._parsed_content_type[0].lower()
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@property
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def mimetype_params(self):
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"""The mimetype parameters as dict. For example if the content
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type is ``text/html; charset=utf-8`` the params would be
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``{'charset': 'utf-8'}``.
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"""
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self._parse_content_type()
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return self._parsed_content_type[1]
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@cached_property
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def pragma(self):
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"""The Pragma general-header field is used to include
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implementation-specific directives that might apply to any recipient
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along the request/response chain. All pragma directives specify
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optional behavior from the viewpoint of the protocol; however, some
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systems MAY require that behavior be consistent with the directives.
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"""
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return parse_set_header(self.environ.get("HTTP_PRAGMA", ""))
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class CommonResponseDescriptorsMixin(object):
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"""A mixin for :class:`BaseResponse` subclasses. Response objects that
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mix this class in will automatically get descriptors for a couple of
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HTTP headers with automatic type conversion.
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"""
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@property
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def mimetype(self):
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"""The mimetype (content type without charset etc.)"""
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ct = self.headers.get("content-type")
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if ct:
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return ct.split(";")[0].strip()
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@mimetype.setter
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def mimetype(self, value):
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self.headers["Content-Type"] = get_content_type(value, self.charset)
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@property
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def mimetype_params(self):
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"""The mimetype parameters as dict. For example if the
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content type is ``text/html; charset=utf-8`` the params would be
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``{'charset': 'utf-8'}``.
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.. versionadded:: 0.5
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"""
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def on_update(d):
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self.headers["Content-Type"] = dump_options_header(self.mimetype, d)
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d = parse_options_header(self.headers.get("content-type", ""))[1]
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return CallbackDict(d, on_update)
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location = header_property(
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"Location",
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doc="""The Location response-header field is used to redirect
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the recipient to a location other than the Request-URI for
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completion of the request or identification of a new
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resource.""",
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)
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age = header_property(
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"Age",
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None,
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parse_age,
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dump_age,
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doc="""The Age response-header field conveys the sender's
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estimate of the amount of time since the response (or its
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revalidation) was generated at the origin server.
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Age values are non-negative decimal integers, representing time
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in seconds.""",
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)
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content_type = header_property(
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"Content-Type",
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doc="""The Content-Type entity-header field indicates the media
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type of the entity-body sent to the recipient or, in the case of
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the HEAD method, the media type that would have been sent had
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the request been a GET.""",
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)
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content_length = header_property(
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"Content-Length",
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None,
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int,
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str,
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doc="""The Content-Length entity-header field indicates the size
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of the entity-body, in decimal number of OCTETs, sent to the
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recipient or, in the case of the HEAD method, the size of the
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entity-body that would have been sent had the request been a
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GET.""",
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)
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content_location = header_property(
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"Content-Location",
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doc="""The Content-Location entity-header field MAY be used to
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supply the resource location for the entity enclosed in the
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message when that entity is accessible from a location separate
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from the requested resource's URI.""",
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)
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content_encoding = header_property(
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"Content-Encoding",
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doc="""The Content-Encoding entity-header field is used as a
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modifier to the media-type. When present, its value indicates
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what additional content codings have been applied to the
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entity-body, and thus what decoding mechanisms must be applied
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in order to obtain the media-type referenced by the Content-Type
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header field.""",
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)
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content_md5 = header_property(
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"Content-MD5",
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doc="""The Content-MD5 entity-header field, as defined in
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RFC 1864, is an MD5 digest of the entity-body for the purpose of
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providing an end-to-end message integrity check (MIC) of the
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entity-body. (Note: a MIC is good for detecting accidental
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modification of the entity-body in transit, but is not proof
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against malicious attacks.)""",
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)
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date = header_property(
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"Date",
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None,
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parse_date,
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http_date,
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doc="""The Date general-header field represents the date and
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time at which the message was originated, having the same
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semantics as orig-date in RFC 822.""",
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)
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expires = header_property(
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"Expires",
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None,
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parse_date,
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http_date,
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doc="""The Expires entity-header field gives the date/time after
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which the response is considered stale. A stale cache entry may
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not normally be returned by a cache.""",
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)
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last_modified = header_property(
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"Last-Modified",
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None,
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parse_date,
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http_date,
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doc="""The Last-Modified entity-header field indicates the date
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and time at which the origin server believes the variant was
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last modified.""",
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)
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@property
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def retry_after(self):
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"""The Retry-After response-header field can be used with a
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503 (Service Unavailable) response to indicate how long the
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service is expected to be unavailable to the requesting client.
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Time in seconds until expiration or date.
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"""
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value = self.headers.get("retry-after")
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if value is None:
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return
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elif value.isdigit():
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return datetime.utcnow() + timedelta(seconds=int(value))
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return parse_date(value)
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@retry_after.setter
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def retry_after(self, value):
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if value is None:
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if "retry-after" in self.headers:
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del self.headers["retry-after"]
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return
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elif isinstance(value, datetime):
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value = http_date(value)
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else:
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value = str(value)
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self.headers["Retry-After"] = value
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def _set_property(name, doc=None): # noqa: B902
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def fget(self):
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def on_update(header_set):
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if not header_set and name in self.headers:
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del self.headers[name]
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elif header_set:
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self.headers[name] = header_set.to_header()
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return parse_set_header(self.headers.get(name), on_update)
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def fset(self, value):
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if not value:
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del self.headers[name]
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elif isinstance(value, string_types):
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self.headers[name] = value
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else:
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self.headers[name] = dump_header(value)
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return property(fget, fset, doc=doc)
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vary = _set_property(
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"Vary",
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doc="""The Vary field value indicates the set of request-header
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fields that fully determines, while the response is fresh,
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whether a cache is permitted to use the response to reply to a
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subsequent request without revalidation.""",
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)
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content_language = _set_property(
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"Content-Language",
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doc="""The Content-Language entity-header field describes the
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natural language(s) of the intended audience for the enclosed
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entity. Note that this might not be equivalent to all the
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languages used within the entity-body.""",
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)
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allow = _set_property(
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"Allow",
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doc="""The Allow entity-header field lists the set of methods
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supported by the resource identified by the Request-URI. The
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purpose of this field is strictly to inform the recipient of
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valid methods associated with the resource. An Allow header
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field MUST be present in a 405 (Method Not Allowed)
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response.""",
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)
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del _set_property
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