Current File : //opt/alt/python35/lib64/python3.5/site-packages/aiohttp/formdata.py
import io
from urllib.parse import urlencode
from multidict import MultiDict, MultiDictProxy
from . import hdrs, multipart, payload
from .helpers import guess_filename
__all__ = ('FormData',)
class FormData:
"""Helper class for multipart/form-data and
application/x-www-form-urlencoded body generation."""
def __init__(self, fields=(), quote_fields=True, charset=None):
self._writer = multipart.MultipartWriter('form-data')
self._fields = []
self._is_multipart = False
self._quote_fields = quote_fields
self._charset = charset
if isinstance(fields, dict):
fields = list(fields.items())
elif not isinstance(fields, (list, tuple)):
fields = (fields,)
self.add_fields(*fields)
@property
def is_multipart(self):
return self._is_multipart
def add_field(self, name, value, *, content_type=None, filename=None,
content_transfer_encoding=None):
if isinstance(value, io.IOBase):
self._is_multipart = True
elif isinstance(value, (bytes, bytearray, memoryview)):
if filename is None and content_transfer_encoding is None:
filename = name
type_options = MultiDict({'name': name})
if filename is not None and not isinstance(filename, str):
raise TypeError('filename must be an instance of str. '
'Got: %s' % filename)
if filename is None and isinstance(value, io.IOBase):
filename = guess_filename(value, name)
if filename is not None:
type_options['filename'] = filename
self._is_multipart = True
headers = {}
if content_type is not None:
if not isinstance(content_type, str):
raise TypeError('content_type must be an instance of str. '
'Got: %s' % content_type)
headers[hdrs.CONTENT_TYPE] = content_type
self._is_multipart = True
if content_transfer_encoding is not None:
if not isinstance(content_transfer_encoding, str):
raise TypeError('content_transfer_encoding must be an instance'
' of str. Got: %s' % content_transfer_encoding)
headers[hdrs.CONTENT_TRANSFER_ENCODING] = content_transfer_encoding
self._is_multipart = True
self._fields.append((type_options, headers, value))
def add_fields(self, *fields):
to_add = list(fields)
while to_add:
rec = to_add.pop(0)
if isinstance(rec, io.IOBase):
k = guess_filename(rec, 'unknown')
self.add_field(k, rec)
elif isinstance(rec, (MultiDictProxy, MultiDict)):
to_add.extend(rec.items())
elif isinstance(rec, (list, tuple)) and len(rec) == 2:
k, fp = rec
self.add_field(k, fp)
else:
raise TypeError('Only io.IOBase, multidict and (name, file) '
'pairs allowed, use .add_field() for passing '
'more complex parameters, got {!r}'
.format(rec))
def _gen_form_urlencoded(self):
# form data (x-www-form-urlencoded)
data = []
for type_options, _, value in self._fields:
data.append((type_options['name'], value))
charset = self._charset if self._charset is not None else 'utf-8'
if charset == 'utf-8':
content_type = 'application/x-www-form-urlencoded'
else:
content_type = ('application/x-www-form-urlencoded; '
'charset=%s' % charset)
return payload.BytesPayload(
urlencode(data, doseq=True, encoding=charset).encode(),
content_type=content_type)
def _gen_form_data(self):
"""Encode a list of fields using the multipart/form-data MIME format"""
for dispparams, headers, value in self._fields:
try:
if hdrs.CONTENT_TYPE in headers:
part = payload.get_payload(
value, content_type=headers[hdrs.CONTENT_TYPE],
headers=headers, encoding=self._charset)
else:
part = payload.get_payload(
value, headers=headers, encoding=self._charset)
except Exception as exc:
raise TypeError(
'Can not serialize value type: %r\n '
'headers: %r\n value: %r' % (
type(value), headers, value)) from exc
if dispparams:
part.set_content_disposition(
'form-data', quote_fields=self._quote_fields, **dispparams
)
# FIXME cgi.FieldStorage doesn't likes body parts with
# Content-Length which were sent via chunked transfer encoding
part.headers.popall(hdrs.CONTENT_LENGTH, None)
self._writer.append_payload(part)
return self._writer
def __call__(self):
if self._is_multipart:
return self._gen_form_data()
else:
return self._gen_form_urlencoded()
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