724 lines
26 KiB
Python
724 lines
26 KiB
Python
"""Request body processing for CherryPy.
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When an HTTP request includes an entity body, it is often desirable to
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provide that information to applications in a form other than the raw bytes.
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Different content types demand different approaches. Examples:
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* For a GIF file, we want the raw bytes in a stream.
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* An HTML form is better parsed into its component fields, and each text field
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decoded from bytes to unicode.
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* A JSON body should be deserialized into a Python dict or list.
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When the request contains a Content-Type header, the media type is used as a
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key to look up a value in the 'request.body.processors' dict. If the full media
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type is not found, then the major type is tried; for example, if no processor
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is found for the 'image/jpeg' type, then we look for a processor for the 'image'
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types altogether. If neither the full type nor the major type has a matching
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processor, then a default processor is used (self.default_proc). For most
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types, this means no processing is done, and the body is left unread as a
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raw byte stream. Processors are configurable in an 'on_start_resource' hook.
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Some processors, especially those for the 'text' types, attempt to decode bytes
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to unicode. If the Content-Type request header includes a 'charset' parameter,
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this is used to decode the entity. Otherwise, one or more default charsets may
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be attempted, although this decision is up to each processor. If a processor
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successfully decodes an Entity or Part, it should set the 'charset' attribute
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on the Entity or Part to the name of the successful charset, so that
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applications can easily re-encode or transcode the value if they wish.
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If the Content-Type of the request entity is of major type 'multipart', then
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the above parsing process, and possibly a decoding process, is performed for
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each part.
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For both the full entity and multipart parts, a Content-Disposition header may
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be used to fill .name and .filename attributes on the request.body or the Part.
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"""
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import re
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import tempfile
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from urllib import unquote_plus
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import cherrypy
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from cherrypy.lib import httputil
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# -------------------------------- Processors -------------------------------- #
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def process_urlencoded(entity):
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"""Read application/x-www-form-urlencoded data into entity.params."""
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qs = entity.fp.read()
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for charset in entity.attempt_charsets:
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try:
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params = {}
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for aparam in qs.split('&'):
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for pair in aparam.split(';'):
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if not pair:
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continue
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atoms = pair.split('=', 1)
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if len(atoms) == 1:
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atoms.append('')
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key = unquote_plus(atoms[0]).decode(charset)
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value = unquote_plus(atoms[1]).decode(charset)
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if key in params:
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if not isinstance(params[key], list):
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params[key] = [params[key]]
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params[key].append(value)
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else:
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params[key] = value
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except UnicodeDecodeError:
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pass
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else:
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entity.charset = charset
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break
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else:
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raise cherrypy.HTTPError(
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400, "The request entity could not be decoded. The following "
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"charsets were attempted: %s" % repr(entity.attempt_charsets))
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# Now that all values have been successfully parsed and decoded,
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# apply them to the entity.params dict.
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for key, value in params.items():
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if key in entity.params:
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if not isinstance(entity.params[key], list):
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entity.params[key] = [entity.params[key]]
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entity.params[key].append(value)
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else:
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entity.params[key] = value
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def process_multipart(entity):
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"""Read all multipart parts into entity.parts."""
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ib = u""
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if u'boundary' in entity.content_type.params:
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# http://tools.ietf.org/html/rfc2046#section-5.1.1
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# "The grammar for parameters on the Content-type field is such that it
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# is often necessary to enclose the boundary parameter values in quotes
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# on the Content-type line"
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ib = entity.content_type.params['boundary'].strip(u'"')
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if not re.match(u"^[ -~]{0,200}[!-~]$", ib):
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raise ValueError(u'Invalid boundary in multipart form: %r' % (ib,))
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ib = (u'--' + ib).encode('ascii')
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# Find the first marker
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while True:
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b = entity.readline()
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if not b:
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return
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b = b.strip()
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if b == ib:
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break
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# Read all parts
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while True:
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part = entity.part_class.from_fp(entity.fp, ib)
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entity.parts.append(part)
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part.process()
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if part.fp.done:
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break
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def process_multipart_form_data(entity):
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"""Read all multipart/form-data parts into entity.parts or entity.params."""
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process_multipart(entity)
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kept_parts = []
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for part in entity.parts:
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if part.name is None:
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kept_parts.append(part)
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else:
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if part.filename is None:
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# It's a regular field
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entity.params[part.name] = part.fullvalue()
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else:
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# It's a file upload. Retain the whole part so consumer code
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# has access to its .file and .filename attributes.
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entity.params[part.name] = part
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entity.parts = kept_parts
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def _old_process_multipart(entity):
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"""The behavior of 3.2 and lower. Deprecated and will be changed in 3.3."""
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process_multipart(entity)
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params = entity.params
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for part in entity.parts:
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if part.name is None:
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key = u'parts'
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else:
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key = part.name
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if part.filename is None:
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# It's a regular field
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value = part.fullvalue()
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else:
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# It's a file upload. Retain the whole part so consumer code
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# has access to its .file and .filename attributes.
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value = part
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if key in params:
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if not isinstance(params[key], list):
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params[key] = [params[key]]
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params[key].append(value)
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else:
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params[key] = value
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# --------------------------------- Entities --------------------------------- #
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class Entity(object):
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"""An HTTP request body, or MIME multipart body."""
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__metaclass__ = cherrypy._AttributeDocstrings
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params = None
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params__doc = u"""
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If the request Content-Type is 'application/x-www-form-urlencoded' or
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multipart, this will be a dict of the params pulled from the entity
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body; that is, it will be the portion of request.params that come
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from the message body (sometimes called "POST params", although they
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can be sent with various HTTP method verbs). This value is set between
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the 'before_request_body' and 'before_handler' hooks (assuming that
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process_request_body is True)."""
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default_content_type = u'application/x-www-form-urlencoded'
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# http://tools.ietf.org/html/rfc2046#section-4.1.2:
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# "The default character set, which must be assumed in the
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# absence of a charset parameter, is US-ASCII."
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# However, many browsers send data in utf-8 with no charset.
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attempt_charsets = [u'utf-8']
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processors = {u'application/x-www-form-urlencoded': process_urlencoded,
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u'multipart/form-data': process_multipart_form_data,
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u'multipart': process_multipart,
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}
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def __init__(self, fp, headers, params=None, parts=None):
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# Make an instance-specific copy of the class processors
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# so Tools, etc. can replace them per-request.
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self.processors = self.processors.copy()
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self.fp = fp
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self.headers = headers
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if params is None:
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params = {}
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self.params = params
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if parts is None:
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parts = []
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self.parts = parts
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# Content-Type
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self.content_type = headers.elements(u'Content-Type')
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if self.content_type:
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self.content_type = self.content_type[0]
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else:
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self.content_type = httputil.HeaderElement.from_str(
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self.default_content_type)
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# Copy the class 'attempt_charsets', prepending any Content-Type charset
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dec = self.content_type.params.get(u"charset", None)
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if dec:
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dec = dec.decode('ISO-8859-1')
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self.attempt_charsets = [dec] + [c for c in self.attempt_charsets
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if c != dec]
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else:
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self.attempt_charsets = self.attempt_charsets[:]
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# Length
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self.length = None
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clen = headers.get(u'Content-Length', None)
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# If Transfer-Encoding is 'chunked', ignore any Content-Length.
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if clen is not None and 'chunked' not in headers.get(u'Transfer-Encoding', ''):
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try:
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self.length = int(clen)
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except ValueError:
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pass
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# Content-Disposition
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self.name = None
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self.filename = None
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disp = headers.elements(u'Content-Disposition')
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if disp:
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disp = disp[0]
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if 'name' in disp.params:
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self.name = disp.params['name']
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if self.name.startswith(u'"') and self.name.endswith(u'"'):
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self.name = self.name[1:-1]
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if 'filename' in disp.params:
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self.filename = disp.params['filename']
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if self.filename.startswith(u'"') and self.filename.endswith(u'"'):
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self.filename = self.filename[1:-1]
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# The 'type' attribute is deprecated in 3.2; remove it in 3.3.
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type = property(lambda self: self.content_type)
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def read(self, size=None, fp_out=None):
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return self.fp.read(size, fp_out)
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def readline(self, size=None):
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return self.fp.readline(size)
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def readlines(self, sizehint=None):
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return self.fp.readlines(sizehint)
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def __iter__(self):
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return self
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def next(self):
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line = self.readline()
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if not line:
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raise StopIteration
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return line
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def read_into_file(self, fp_out=None):
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"""Read the request body into fp_out (or make_file() if None). Return fp_out."""
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if fp_out is None:
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fp_out = self.make_file()
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self.read(fp_out=fp_out)
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return fp_out
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def make_file(self):
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"""Return a file into which the request body will be read.
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By default, this will return a TemporaryFile. Override as needed."""
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return tempfile.TemporaryFile()
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def fullvalue(self):
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"""Return this entity as a string, whether stored in a file or not."""
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if self.file:
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# It was stored in a tempfile. Read it.
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self.file.seek(0)
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value = self.file.read()
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self.file.seek(0)
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else:
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value = self.value
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return value
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def process(self):
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"""Execute the best-match processor for the given media type."""
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proc = None
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ct = self.content_type.value
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try:
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proc = self.processors[ct]
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except KeyError:
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toptype = ct.split(u'/', 1)[0]
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try:
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proc = self.processors[toptype]
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except KeyError:
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pass
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if proc is None:
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self.default_proc()
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else:
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proc(self)
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def default_proc(self):
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# Leave the fp alone for someone else to read. This works fine
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# for request.body, but the Part subclasses need to override this
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# so they can move on to the next part.
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pass
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class Part(Entity):
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"""A MIME part entity, part of a multipart entity."""
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default_content_type = u'text/plain'
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# "The default character set, which must be assumed in the absence of a
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# charset parameter, is US-ASCII."
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attempt_charsets = [u'us-ascii', u'utf-8']
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# This is the default in stdlib cgi. We may want to increase it.
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maxrambytes = 1000
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def __init__(self, fp, headers, boundary):
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Entity.__init__(self, fp, headers)
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self.boundary = boundary
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self.file = None
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self.value = None
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def from_fp(cls, fp, boundary):
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headers = cls.read_headers(fp)
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return cls(fp, headers, boundary)
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from_fp = classmethod(from_fp)
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def read_headers(cls, fp):
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headers = httputil.HeaderMap()
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while True:
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line = fp.readline()
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if not line:
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# No more data--illegal end of headers
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raise EOFError(u"Illegal end of headers.")
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if line == '\r\n':
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# Normal end of headers
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break
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if not line.endswith('\r\n'):
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raise ValueError(u"MIME requires CRLF terminators: %r" % line)
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if line[0] in ' \t':
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# It's a continuation line.
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v = line.strip().decode(u'ISO-8859-1')
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else:
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k, v = line.split(":", 1)
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k = k.strip().decode(u'ISO-8859-1')
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v = v.strip().decode(u'ISO-8859-1')
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existing = headers.get(k)
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if existing:
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v = u", ".join((existing, v))
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headers[k] = v
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return headers
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read_headers = classmethod(read_headers)
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def read_lines_to_boundary(self, fp_out=None):
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"""Read bytes from self.fp and return or write them to a file.
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If the 'fp_out' argument is None (the default), all bytes read are
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returned in a single byte string.
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If the 'fp_out' argument is not None, it must be a file-like object that
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supports the 'write' method; all bytes read will be written to the fp,
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and that fp is returned.
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"""
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endmarker = self.boundary + "--"
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delim = ""
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prev_lf = True
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lines = []
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seen = 0
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while True:
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line = self.fp.readline(1 << 16)
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if not line:
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raise EOFError(u"Illegal end of multipart body.")
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if line.startswith("--") and prev_lf:
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strippedline = line.strip()
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if strippedline == self.boundary:
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break
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if strippedline == endmarker:
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self.fp.finish()
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break
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line = delim + line
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if line.endswith("\r\n"):
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delim = "\r\n"
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line = line[:-2]
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prev_lf = True
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elif line.endswith("\n"):
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delim = "\n"
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line = line[:-1]
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prev_lf = True
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else:
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delim = ""
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prev_lf = False
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if fp_out is None:
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lines.append(line)
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seen += len(line)
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if seen > self.maxrambytes:
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fp_out = self.make_file()
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for line in lines:
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fp_out.write(line)
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else:
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fp_out.write(line)
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if fp_out is None:
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result = ''.join(lines)
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for charset in self.attempt_charsets:
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try:
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result = result.decode(charset)
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except UnicodeDecodeError:
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pass
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else:
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self.charset = charset
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return result
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else:
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raise cherrypy.HTTPError(
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400, "The request entity could not be decoded. The following "
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"charsets were attempted: %s" % repr(self.attempt_charsets))
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else:
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fp_out.seek(0)
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return fp_out
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def default_proc(self):
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if self.filename:
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# Always read into a file if a .filename was given.
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self.file = self.read_into_file()
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else:
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result = self.read_lines_to_boundary()
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if isinstance(result, basestring):
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self.value = result
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else:
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self.file = result
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def read_into_file(self, fp_out=None):
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"""Read the request body into fp_out (or make_file() if None). Return fp_out."""
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if fp_out is None:
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fp_out = self.make_file()
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self.read_lines_to_boundary(fp_out=fp_out)
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return fp_out
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Entity.part_class = Part
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class Infinity(object):
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def __cmp__(self, other):
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return 1
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def __sub__(self, other):
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return self
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inf = Infinity()
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|
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comma_separated_headers = ['Accept', 'Accept-Charset', 'Accept-Encoding',
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'Accept-Language', 'Accept-Ranges', 'Allow', 'Cache-Control', 'Connection',
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'Content-Encoding', 'Content-Language', 'Expect', 'If-Match',
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'If-None-Match', 'Pragma', 'Proxy-Authenticate', 'Te', 'Trailer',
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'Transfer-Encoding', 'Upgrade', 'Vary', 'Via', 'Warning', 'Www-Authenticate']
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class SizedReader:
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def __init__(self, fp, length, maxbytes, bufsize=8192, has_trailers=False):
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# Wrap our fp in a buffer so peek() works
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self.fp = fp
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self.length = length
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self.maxbytes = maxbytes
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self.buffer = ''
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self.bufsize = bufsize
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self.bytes_read = 0
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self.done = False
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self.has_trailers = has_trailers
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def read(self, size=None, fp_out=None):
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"""Read bytes from the request body and return or write them to a file.
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|
|
A number of bytes less than or equal to the 'size' argument are read
|
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off the socket. The actual number of bytes read are tracked in
|
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self.bytes_read. The number may be smaller than 'size' when 1) the
|
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client sends fewer bytes, 2) the 'Content-Length' request header
|
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specifies fewer bytes than requested, or 3) the number of bytes read
|
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exceeds self.maxbytes (in which case, 413 is raised).
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|
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If the 'fp_out' argument is None (the default), all bytes read are
|
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returned in a single byte string.
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|
|
If the 'fp_out' argument is not None, it must be a file-like object that
|
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supports the 'write' method; all bytes read will be written to the fp,
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and None is returned.
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"""
|
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|
|
if self.length is None:
|
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if size is None:
|
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remaining = inf
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else:
|
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remaining = size
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else:
|
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remaining = self.length - self.bytes_read
|
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if size and size < remaining:
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remaining = size
|
|
if remaining == 0:
|
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self.finish()
|
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if fp_out is None:
|
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return ''
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else:
|
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return None
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|
|
chunks = []
|
|
|
|
# Read bytes from the buffer.
|
|
if self.buffer:
|
|
if remaining is inf:
|
|
data = self.buffer
|
|
self.buffer = ''
|
|
else:
|
|
data = self.buffer[:remaining]
|
|
self.buffer = self.buffer[remaining:]
|
|
datalen = len(data)
|
|
remaining -= datalen
|
|
|
|
# Check lengths.
|
|
self.bytes_read += datalen
|
|
if self.maxbytes and self.bytes_read > self.maxbytes:
|
|
raise cherrypy.HTTPError(413)
|
|
|
|
# Store the data.
|
|
if fp_out is None:
|
|
chunks.append(data)
|
|
else:
|
|
fp_out.write(data)
|
|
|
|
# Read bytes from the socket.
|
|
while remaining > 0:
|
|
chunksize = min(remaining, self.bufsize)
|
|
try:
|
|
data = self.fp.read(chunksize)
|
|
except Exception, e:
|
|
if e.__class__.__name__ == 'MaxSizeExceeded':
|
|
# Post data is too big
|
|
raise cherrypy.HTTPError(
|
|
413, "Maximum request length: %r" % e.args[1])
|
|
else:
|
|
raise
|
|
if not data:
|
|
self.finish()
|
|
break
|
|
datalen = len(data)
|
|
remaining -= datalen
|
|
|
|
# Check lengths.
|
|
self.bytes_read += datalen
|
|
if self.maxbytes and self.bytes_read > self.maxbytes:
|
|
raise cherrypy.HTTPError(413)
|
|
|
|
# Store the data.
|
|
if fp_out is None:
|
|
chunks.append(data)
|
|
else:
|
|
fp_out.write(data)
|
|
|
|
if fp_out is None:
|
|
return ''.join(chunks)
|
|
|
|
def readline(self, size=None):
|
|
"""Read a line from the request body and return it."""
|
|
chunks = []
|
|
while size is None or size > 0:
|
|
chunksize = self.bufsize
|
|
if size is not None and size < self.bufsize:
|
|
chunksize = size
|
|
data = self.read(chunksize)
|
|
if not data:
|
|
break
|
|
pos = data.find('\n') + 1
|
|
if pos:
|
|
chunks.append(data[:pos])
|
|
remainder = data[pos:]
|
|
self.buffer += remainder
|
|
self.bytes_read -= len(remainder)
|
|
break
|
|
else:
|
|
chunks.append(data)
|
|
return ''.join(chunks)
|
|
|
|
def readlines(self, sizehint=None):
|
|
"""Read lines from the request body and return them."""
|
|
if self.length is not None:
|
|
if sizehint is None:
|
|
sizehint = self.length - self.bytes_read
|
|
else:
|
|
sizehint = min(sizehint, self.length - self.bytes_read)
|
|
|
|
lines = []
|
|
seen = 0
|
|
while True:
|
|
line = self.readline()
|
|
if not line:
|
|
break
|
|
lines.append(line)
|
|
seen += len(line)
|
|
if seen >= sizehint:
|
|
break
|
|
return lines
|
|
|
|
def finish(self):
|
|
self.done = True
|
|
if self.has_trailers and hasattr(self.fp, 'read_trailer_lines'):
|
|
self.trailers = {}
|
|
|
|
try:
|
|
for line in self.fp.read_trailer_lines():
|
|
if line[0] in ' \t':
|
|
# It's a continuation line.
|
|
v = line.strip()
|
|
else:
|
|
try:
|
|
k, v = line.split(":", 1)
|
|
except ValueError:
|
|
raise ValueError("Illegal header line.")
|
|
k = k.strip().title()
|
|
v = v.strip()
|
|
|
|
if k in comma_separated_headers:
|
|
existing = self.trailers.get(envname)
|
|
if existing:
|
|
v = ", ".join((existing, v))
|
|
self.trailers[k] = v
|
|
except Exception, e:
|
|
if e.__class__.__name__ == 'MaxSizeExceeded':
|
|
# Post data is too big
|
|
raise cherrypy.HTTPError(
|
|
413, "Maximum request length: %r" % e.args[1])
|
|
else:
|
|
raise
|
|
|
|
|
|
class RequestBody(Entity):
|
|
|
|
# Don't parse the request body at all if the client didn't provide
|
|
# a Content-Type header. See http://www.cherrypy.org/ticket/790
|
|
default_content_type = u''
|
|
|
|
bufsize = 8 * 1024
|
|
maxbytes = None
|
|
|
|
def __init__(self, fp, headers, params=None, request_params=None):
|
|
Entity.__init__(self, fp, headers, params)
|
|
|
|
# http://www.w3.org/Protocols/rfc2616/rfc2616-sec3.html#sec3.7.1
|
|
# When no explicit charset parameter is provided by the
|
|
# sender, media subtypes of the "text" type are defined
|
|
# to have a default charset value of "ISO-8859-1" when
|
|
# received via HTTP.
|
|
if self.content_type.value.startswith('text/'):
|
|
for c in (u'ISO-8859-1', u'iso-8859-1', u'Latin-1', u'latin-1'):
|
|
if c in self.attempt_charsets:
|
|
break
|
|
else:
|
|
self.attempt_charsets.append(u'ISO-8859-1')
|
|
|
|
# Temporary fix while deprecating passing .parts as .params.
|
|
self.processors[u'multipart'] = _old_process_multipart
|
|
|
|
if request_params is None:
|
|
request_params = {}
|
|
self.request_params = request_params
|
|
|
|
def process(self):
|
|
"""Include body params in request params."""
|
|
# "The presence of a message-body in a request is signaled by the
|
|
# inclusion of a Content-Length or Transfer-Encoding header field in
|
|
# the request's message-headers."
|
|
# It is possible to send a POST request with no body, for example;
|
|
# however, app developers are responsible in that case to set
|
|
# cherrypy.request.process_body to False so this method isn't called.
|
|
h = cherrypy.serving.request.headers
|
|
if u'Content-Length' not in h and u'Transfer-Encoding' not in h:
|
|
raise cherrypy.HTTPError(411)
|
|
|
|
self.fp = SizedReader(self.fp, self.length,
|
|
self.maxbytes, bufsize=self.bufsize,
|
|
has_trailers='Trailer' in h)
|
|
super(RequestBody, self).process()
|
|
|
|
# Body params should also be a part of the request_params
|
|
# add them in here.
|
|
request_params = self.request_params
|
|
for key, value in self.params.items():
|
|
# Python 2 only: keyword arguments must be byte strings (type 'str').
|
|
if isinstance(key, unicode):
|
|
key = key.encode('ISO-8859-1')
|
|
|
|
if key in request_params:
|
|
if not isinstance(request_params[key], list):
|
|
request_params[key] = [request_params[key]]
|
|
request_params[key].append(value)
|
|
else:
|
|
request_params[key] = value
|
|
|