104 lines
3.2 KiB
Python
104 lines
3.2 KiB
Python
# -*- coding: utf-8 -*-
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# vi:si:et:sw=4:sts=4:ts=4
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# GPL 2014
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from __future__ import print_function
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import itertools
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import mimetypes
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import os
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import hashlib
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import sys
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__all__ = ['MultiPartForm']
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# from /usr/lib/python3.4/email/generator.py
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# Helper used by Generator._make_boundary
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_width = len(repr(sys.maxsize-1))
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_fmt = '%%0%dd' % _width
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def _make_boundary():
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# Craft a random boundary.
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boundary = ('=' * 15) + hashlib.sha1(os.urandom(32)).hexdigest() + '=='
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return boundary
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class MultiPartForm(object):
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"""Accumulate the data to be used when posting a form."""
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def __init__(self):
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self.form_fields = []
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self.files = []
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self.boundary = _make_boundary()
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return
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def get_content_type(self):
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return 'multipart/form-data; boundary=%s' % self.boundary
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def add_field(self, name, value):
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"""Add a simple field to the form data."""
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if isinstance(name, bytes):
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name = name.decode('utf-8')
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if isinstance(value, bytes):
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value = value.decode('utf-8')
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self.form_fields.append((name, value))
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return
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def add_file(self, fieldname, filename, fileHandle, mimetype=None):
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"""Add a file to be uploaded."""
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if isinstance(fieldname, bytes):
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fieldname = fieldname.decode('utf-8')
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if isinstance(filename, bytes):
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filename = filename.decode('utf-8')
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if hasattr(fileHandle, 'read'):
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body = fileHandle.read()
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else:
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body = fileHandle
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if mimetype is None:
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mimetype = mimetypes.guess_type(filename)[0] or 'application/octet-stream'
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self.files.append((fieldname, filename, mimetype, body))
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return
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def __str__(self):
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body = self.body()
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return body
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def body(self):
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"""Return a byte string representing the form data, including attached files."""
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# Build a list of lists, each containing "lines" of the
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# request. Each part is separated by a boundary string.
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# Once the list is built, return a string where each
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# line is separated by '\r\n'.
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parts = []
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part_boundary = '--' + self.boundary
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# Add the form fields
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parts.extend(
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[ part_boundary,
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'Content-Disposition: form-data; name="%s"' % name,
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'',
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value,
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]
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for name, value in self.form_fields
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)
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# Add the files to upload
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parts.extend(
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[ part_boundary,
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'Content-Disposition: file; name="%s"; filename="%s"' % \
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(field_name, filename),
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'Content-Type: %s' % content_type,
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'',
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body,
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]
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for field_name, filename, content_type, body in self.files
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)
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# Flatten the list and add closing boundary marker,
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# then return CR+LF separated data
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flattened = list(itertools.chain(*parts))
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flattened.append('--' + self.boundary + '--')
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flattened.append('')
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flattened = [part if isinstance(part, bytes) else part.encode('utf-8') for part in flattened]
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return b'\r\n'.join(flattened)
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