diff -r 6641e941ef1e -r ff1a9aa48cfd app/django/http/multipartparser.py
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/http/multipartparser.py	Tue Oct 14 16:00:59 2008 +0000
@@ -0,0 +1,639 @@
+"""
+Multi-part parsing for file uploads.
+
+Exposes one class, ``MultiPartParser``, which feeds chunks of uploaded data to
+file upload handlers for processing.
+"""
+
+import cgi
+from django.conf import settings
+from django.core.exceptions import SuspiciousOperation
+from django.utils.datastructures import MultiValueDict
+from django.utils.encoding import force_unicode
+from django.utils.text import unescape_entities
+from django.core.files.uploadhandler import StopUpload, SkipFile, StopFutureHandlers
+
+__all__ = ('MultiPartParser', 'MultiPartParserError', 'InputStreamExhausted')
+
+class MultiPartParserError(Exception):
+    pass
+
+class InputStreamExhausted(Exception):
+    """
+    No more reads are allowed from this device.
+    """
+    pass
+
+RAW = "raw"
+FILE = "file"
+FIELD = "field"
+
+class MultiPartParser(object):
+    """
+    A rfc2388 multipart/form-data parser.
+
+    ``MultiValueDict.parse()`` reads the input stream in ``chunk_size`` chunks
+    and returns a tuple of ``(MultiValueDict(POST), MultiValueDict(FILES))``. If
+    ``file_upload_dir`` is defined files will be streamed to temporary files in
+    that directory.
+    """
+    def __init__(self, META, input_data, upload_handlers, encoding=None):
+        """
+        Initialize the MultiPartParser object.
+
+        :META:
+            The standard ``META`` dictionary in Django request objects.
+        :input_data:
+            The raw post data, as a bytestring.
+        :upload_handler:
+            An UploadHandler instance that performs operations on the uploaded
+            data.
+        :encoding:
+            The encoding with which to treat the incoming data.
+        """
+
+        #
+        # Content-Type should containt multipart and the boundary information.
+        #
+
+        content_type = META.get('HTTP_CONTENT_TYPE', META.get('CONTENT_TYPE', ''))
+        if not content_type.startswith('multipart/'):
+            raise MultiPartParserError('Invalid Content-Type: %s' % content_type)
+
+        # Parse the header to get the boundary to split the parts.
+        ctypes, opts = parse_header(content_type)
+        boundary = opts.get('boundary')
+        if not boundary or not cgi.valid_boundary(boundary):
+            raise MultiPartParserError('Invalid boundary in multipart: %s' % boundary)
+
+
+        #
+        # Content-Length should contain the length of the body we are about
+        # to receive.
+        #
+        try:
+            content_length = int(META.get('HTTP_CONTENT_LENGTH', META.get('CONTENT_LENGTH',0)))
+        except (ValueError, TypeError):
+            # For now set it to 0; we'll try again later on down.
+            content_length = 0
+
+        if content_length <= 0:
+            # This means we shouldn't continue...raise an error.
+            raise MultiPartParserError("Invalid content length: %r" % content_length)
+
+        self._boundary = boundary
+        self._input_data = input_data
+
+        # For compatibility with low-level network APIs (with 32-bit integers),
+        # the chunk size should be < 2^31, but still divisible by 4.
+        self._chunk_size = min(2**31-4, *[x.chunk_size for x in upload_handlers if x.chunk_size])
+
+        self._meta = META
+        self._encoding = encoding or settings.DEFAULT_CHARSET
+        self._content_length = content_length
+        self._upload_handlers = upload_handlers
+
+    def parse(self):
+        """
+        Parse the POST data and break it into a FILES MultiValueDict and a POST
+        MultiValueDict.
+
+        Returns a tuple containing the POST and FILES dictionary, respectively.
+        """
+        # We have to import QueryDict down here to avoid a circular import.
+        from django.http import QueryDict
+
+        encoding = self._encoding
+        handlers = self._upload_handlers
+
+        limited_input_data = LimitBytes(self._input_data, self._content_length)
+
+        # See if the handler will want to take care of the parsing.
+        # This allows overriding everything if somebody wants it.
+        for handler in handlers:
+            result = handler.handle_raw_input(limited_input_data,
+                                              self._meta,
+                                              self._content_length,
+                                              self._boundary,
+                                              encoding)
+            if result is not None:
+                return result[0], result[1]
+
+        # Create the data structures to be used later.
+        self._post = QueryDict('', mutable=True)
+        self._files = MultiValueDict()
+
+        # Instantiate the parser and stream:
+        stream = LazyStream(ChunkIter(limited_input_data, self._chunk_size))
+
+        # Whether or not to signal a file-completion at the beginning of the loop.
+        old_field_name = None
+        counters = [0] * len(handlers)
+
+        try:
+            for item_type, meta_data, field_stream in Parser(stream, self._boundary):
+                if old_field_name:
+                    # We run this at the beginning of the next loop
+                    # since we cannot be sure a file is complete until
+                    # we hit the next boundary/part of the multipart content.
+                    self.handle_file_complete(old_field_name, counters)
+                    old_field_name = None
+
+                try:
+                    disposition = meta_data['content-disposition'][1]
+                    field_name = disposition['name'].strip()
+                except (KeyError, IndexError, AttributeError):
+                    continue
+
+                transfer_encoding = meta_data.get('content-transfer-encoding')
+                field_name = force_unicode(field_name, encoding, errors='replace')
+
+                if item_type == FIELD:
+                    # This is a post field, we can just set it in the post
+                    if transfer_encoding == 'base64':
+                        raw_data = field_stream.read()
+                        try:
+                            data = str(raw_data).decode('base64')
+                        except:
+                            data = raw_data
+                    else:
+                        data = field_stream.read()
+
+                    self._post.appendlist(field_name,
+                                          force_unicode(data, encoding, errors='replace'))
+                elif item_type == FILE:
+                    # This is a file, use the handler...
+                    file_name = disposition.get('filename')
+                    if not file_name:
+                        continue
+                    file_name = force_unicode(file_name, encoding, errors='replace')
+                    file_name = self.IE_sanitize(unescape_entities(file_name))
+
+                    content_type = meta_data.get('content-type', ('',))[0].strip()
+                    try:
+                        charset = meta_data.get('content-type', (0,{}))[1].get('charset', None)
+                    except:
+                        charset = None
+
+                    try:
+                        content_length = int(meta_data.get('content-length')[0])
+                    except (IndexError, TypeError, ValueError):
+                        content_length = None
+
+                    counters = [0] * len(handlers)
+                    try:
+                        for handler in handlers:
+                            try:
+                                handler.new_file(field_name, file_name,
+                                                 content_type, content_length,
+                                                 charset)
+                            except StopFutureHandlers:
+                                break
+
+                        for chunk in field_stream:
+                            if transfer_encoding == 'base64':
+                                # We only special-case base64 transfer encoding
+                                try:
+                                    chunk = str(chunk).decode('base64')
+                                except Exception, e:
+                                    # Since this is only a chunk, any error is an unfixable error.
+                                    raise MultiPartParserError("Could not decode base64 data: %r" % e)
+
+                            for i, handler in enumerate(handlers):
+                                chunk_length = len(chunk)
+                                chunk = handler.receive_data_chunk(chunk,
+                                                                   counters[i])
+                                counters[i] += chunk_length
+                                if chunk is None:
+                                    # If the chunk received by the handler is None, then don't continue.
+                                    break
+
+                    except SkipFile, e:
+                        # Just use up the rest of this file...
+                        exhaust(field_stream)
+                    else:
+                        # Handle file upload completions on next iteration.
+                        old_field_name = field_name
+                else:
+                    # If this is neither a FIELD or a FILE, just exhaust the stream.
+                    exhaust(stream)
+        except StopUpload, e:
+            if not e.connection_reset:
+                exhaust(limited_input_data)
+        else:
+            # Make sure that the request data is all fed
+            exhaust(limited_input_data)
+
+        # Signal that the upload has completed.
+        for handler in handlers:
+            retval = handler.upload_complete()
+            if retval:
+                break
+
+        return self._post, self._files
+
+    def handle_file_complete(self, old_field_name, counters):
+        """
+        Handle all the signalling that takes place when a file is complete.
+        """
+        for i, handler in enumerate(self._upload_handlers):
+            file_obj = handler.file_complete(counters[i])
+            if file_obj:
+                # If it returns a file object, then set the files dict.
+                self._files.appendlist(force_unicode(old_field_name,
+                                                     self._encoding,
+                                                     errors='replace'),
+                                       file_obj)
+                break
+
+    def IE_sanitize(self, filename):
+        """Cleanup filename from Internet Explorer full paths."""
+        return filename and filename[filename.rfind("\\")+1:].strip()
+
+class LazyStream(object):
+    """
+    The LazyStream wrapper allows one to get and "unget" bytes from a stream.
+
+    Given a producer object (an iterator that yields bytestrings), the
+    LazyStream object will support iteration, reading, and keeping a "look-back"
+    variable in case you need to "unget" some bytes.
+    """
+    def __init__(self, producer, length=None):
+        """
+        Every LazyStream must have a producer when instantiated.
+
+        A producer is an iterable that returns a string each time it
+        is called.
+        """
+        self._producer = producer
+        self._empty = False
+        self._leftover = ''
+        self.length = length
+        self.position = 0
+        self._remaining = length
+        self._unget_history = []
+
+    def tell(self):
+        return self.position
+
+    def read(self, size=None):
+        def parts():
+            remaining = (size is not None and [size] or [self._remaining])[0]
+            # do the whole thing in one shot if no limit was provided.
+            if remaining is None:
+                yield ''.join(self)
+                return
+
+            # otherwise do some bookkeeping to return exactly enough
+            # of the stream and stashing any extra content we get from
+            # the producer
+            while remaining != 0:
+                assert remaining > 0, 'remaining bytes to read should never go negative'
+
+                chunk = self.next()
+
+                emitting = chunk[:remaining]
+                self.unget(chunk[remaining:])
+                remaining -= len(emitting)
+                yield emitting
+
+        out = ''.join(parts())
+        return out
+
+    def next(self):
+        """
+        Used when the exact number of bytes to read is unimportant.
+
+        This procedure just returns whatever is chunk is conveniently returned
+        from the iterator instead. Useful to avoid unnecessary bookkeeping if
+        performance is an issue.
+        """
+        if self._leftover:
+            output = self._leftover
+            self._leftover = ''
+        else:
+            output = self._producer.next()
+            self._unget_history = []
+        self.position += len(output)
+        return output
+
+    def close(self):
+        """
+        Used to invalidate/disable this lazy stream.
+
+        Replaces the producer with an empty list. Any leftover bytes that have
+        already been read will still be reported upon read() and/or next().
+        """
+        self._producer = []
+
+    def __iter__(self):
+        return self
+
+    def unget(self, bytes):
+        """
+        Places bytes back onto the front of the lazy stream.
+
+        Future calls to read() will return those bytes first. The
+        stream position and thus tell() will be rewound.
+        """
+        if not bytes:
+            return
+        self._update_unget_history(len(bytes))
+        self.position -= len(bytes)
+        self._leftover = ''.join([bytes, self._leftover])
+
+    def _update_unget_history(self, num_bytes):
+        """
+        Updates the unget history as a sanity check to see if we've pushed
+        back the same number of bytes in one chunk. If we keep ungetting the
+        same number of bytes many times (here, 50), we're mostly likely in an
+        infinite loop of some sort. This is usually caused by a
+        maliciously-malformed MIME request.
+        """
+        self._unget_history = [num_bytes] + self._unget_history[:49]
+        number_equal = len([current_number for current_number in self._unget_history
+                            if current_number == num_bytes])
+
+        if number_equal > 40:
+            raise SuspiciousOperation(
+                "The multipart parser got stuck, which shouldn't happen with"
+                " normal uploaded files. Check for malicious upload activity;"
+                " if there is none, report this to the Django developers."
+            )
+
+class ChunkIter(object):
+    """
+    An iterable that will yield chunks of data. Given a file-like object as the
+    constructor, this object will yield chunks of read operations from that
+    object.
+    """
+    def __init__(self, flo, chunk_size=64 * 1024):
+        self.flo = flo
+        self.chunk_size = chunk_size
+
+    def next(self):
+        try:
+            data = self.flo.read(self.chunk_size)
+        except InputStreamExhausted:
+            raise StopIteration()
+        if data:
+            return data
+        else:
+            raise StopIteration()
+
+    def __iter__(self):
+        return self
+
+class LimitBytes(object):
+    """ Limit bytes for a file object. """
+    def __init__(self, fileobject, length):
+        self._file = fileobject
+        self.remaining = length
+
+    def read(self, num_bytes=None):
+        """
+        Read data from the underlying file.
+        If you ask for too much or there isn't anything left,
+        this will raise an InputStreamExhausted error.
+        """
+        if self.remaining <= 0:
+            raise InputStreamExhausted()
+        if num_bytes is None:
+            num_bytes = self.remaining
+        else:
+            num_bytes = min(num_bytes, self.remaining)
+        self.remaining -= num_bytes
+        return self._file.read(num_bytes)
+
+class InterBoundaryIter(object):
+    """
+    A Producer that will iterate over boundaries.
+    """
+    def __init__(self, stream, boundary):
+        self._stream = stream
+        self._boundary = boundary
+
+    def __iter__(self):
+        return self
+
+    def next(self):
+        try:
+            return LazyStream(BoundaryIter(self._stream, self._boundary))
+        except InputStreamExhausted:
+            raise StopIteration()
+
+class BoundaryIter(object):
+    """
+    A Producer that is sensitive to boundaries.
+
+    Will happily yield bytes until a boundary is found. Will yield the bytes
+    before the boundary, throw away the boundary bytes themselves, and push the
+    post-boundary bytes back on the stream.
+
+    The future calls to .next() after locating the boundary will raise a
+    StopIteration exception.
+    """
+
+    def __init__(self, stream, boundary):
+        self._stream = stream
+        self._boundary = boundary
+        self._done = False
+        # rollback an additional six bytes because the format is like
+        # this: CRLF<boundary>[--CRLF]
+        self._rollback = len(boundary) + 6
+
+        # Try to use mx fast string search if available. Otherwise
+        # use Python find. Wrap the latter for consistency.
+        unused_char = self._stream.read(1)
+        if not unused_char:
+            raise InputStreamExhausted()
+        self._stream.unget(unused_char)
+        try:
+            from mx.TextTools import FS
+            self._fs = FS(boundary).find
+        except ImportError:
+            self._fs = lambda data: data.find(boundary)
+
+    def __iter__(self):
+        return self
+
+    def next(self):
+        if self._done:
+            raise StopIteration()
+
+        stream = self._stream
+        rollback = self._rollback
+
+        bytes_read = 0
+        chunks = []
+        for bytes in stream:
+            bytes_read += len(bytes)
+            chunks.append(bytes)
+            if bytes_read > rollback:
+                break
+            if not bytes:
+                break
+        else:
+            self._done = True
+
+        if not chunks:
+            raise StopIteration()
+
+        chunk = ''.join(chunks)
+        boundary = self._find_boundary(chunk, len(chunk) < self._rollback)
+
+        if boundary:
+            end, next = boundary
+            stream.unget(chunk[next:])
+            self._done = True
+            return chunk[:end]
+        else:
+            # make sure we dont treat a partial boundary (and
+            # its separators) as data
+            if not chunk[:-rollback]:# and len(chunk) >= (len(self._boundary) + 6):
+                # There's nothing left, we should just return and mark as done.
+                self._done = True
+                return chunk
+            else:
+                stream.unget(chunk[-rollback:])
+                return chunk[:-rollback]
+
+    def _find_boundary(self, data, eof = False):
+        """
+        Finds a multipart boundary in data.
+
+        Should no boundry exist in the data None is returned instead. Otherwise
+        a tuple containing the indices of the following are returned:
+
+         * the end of current encapsulation
+         * the start of the next encapsulation
+        """
+        index = self._fs(data)
+        if index < 0:
+            return None
+        else:
+            end = index
+            next = index + len(self._boundary)
+            # backup over CRLF
+            if data[max(0,end-1)] == '\n':
+                end -= 1
+            if data[max(0,end-1)] == '\r':
+                end -= 1
+            return end, next
+
+def exhaust(stream_or_iterable):
+    """
+    Completely exhausts an iterator or stream.
+
+    Raise a MultiPartParserError if the argument is not a stream or an iterable.
+    """
+    iterator = None
+    try:
+        iterator = iter(stream_or_iterable)
+    except TypeError:
+        iterator = ChunkIter(stream_or_iterable, 16384)
+
+    if iterator is None:
+        raise MultiPartParserError('multipartparser.exhaust() was passed a non-iterable or stream parameter')
+
+    for __ in iterator:
+        pass
+
+def parse_boundary_stream(stream, max_header_size):
+    """
+    Parses one and exactly one stream that encapsulates a boundary.
+    """
+    # Stream at beginning of header, look for end of header
+    # and parse it if found. The header must fit within one
+    # chunk.
+    chunk = stream.read(max_header_size)
+
+    # 'find' returns the top of these four bytes, so we'll
+    # need to munch them later to prevent them from polluting
+    # the payload.
+    header_end = chunk.find('\r\n\r\n')
+
+    def _parse_header(line):
+        main_value_pair, params = parse_header(line)
+        try:
+            name, value = main_value_pair.split(':', 1)
+        except:
+            raise ValueError("Invalid header: %r" % line)
+        return name, (value, params)
+
+    if header_end == -1:
+        # we find no header, so we just mark this fact and pass on
+        # the stream verbatim
+        stream.unget(chunk)
+        return (RAW, {}, stream)
+
+    header = chunk[:header_end]
+
+    # here we place any excess chunk back onto the stream, as
+    # well as throwing away the CRLFCRLF bytes from above.
+    stream.unget(chunk[header_end + 4:])
+
+    TYPE = RAW
+    outdict = {}
+
+    # Eliminate blank lines
+    for line in header.split('\r\n'):
+        # This terminology ("main value" and "dictionary of
+        # parameters") is from the Python docs.
+        try:
+            name, (value, params) = _parse_header(line)
+        except:
+            continue
+
+        if name == 'content-disposition':
+            TYPE = FIELD
+            if params.get('filename'):
+                TYPE = FILE
+
+        outdict[name] = value, params
+
+    if TYPE == RAW:
+        stream.unget(chunk)
+
+    return (TYPE, outdict, stream)
+
+class Parser(object):
+    def __init__(self, stream, boundary):
+        self._stream = stream
+        self._separator = '--' + boundary
+
+    def __iter__(self):
+        boundarystream = InterBoundaryIter(self._stream, self._separator)
+        for sub_stream in boundarystream:
+            # Iterate over each part
+            yield parse_boundary_stream(sub_stream, 1024)
+
+def parse_header(line):
+    """ Parse the header into a key-value. """
+    plist = _parse_header_params(';' + line)
+    key = plist.pop(0).lower()
+    pdict = {}
+    for p in plist:
+        i = p.find('=')
+        if i >= 0:
+            name = p[:i].strip().lower()
+            value = p[i+1:].strip()
+            if len(value) >= 2 and value[0] == value[-1] == '"':
+                value = value[1:-1]
+                value = value.replace('\\\\', '\\').replace('\\"', '"')
+            pdict[name] = value
+    return key, pdict
+
+def _parse_header_params(s):
+    plist = []
+    while s[:1] == ';':
+        s = s[1:]
+        end = s.find(';')
+        while end > 0 and s.count('"', 0, end) % 2:
+            end = s.find(';', end + 1)
+        if end < 0:
+            end = len(s)
+        f = s[:end]
+        plist.append(f.strip())
+        s = s[end:]
+    return plist