[Twisted-Python] http.py

Juergen Hermann j.her at t-online.de
Tue May 8 20:30:05 EDT 2001


class HTTPHandler(basic.LineReceiver):

    __length = 0
    __header = ''
    __first_line = 1

    def _parse_command(self, command):
        parts = string.split(command)
        if len(parts)<3:
            parts.append('HTTP/0.9') # isn't backwards compat great!
        if len(parts) != 3:
            self.sendError(405, 'Bad command')
            raise ValueError(str(parts))
        return parts

    def sendStatus(self, code, resp=''):
        self.transport.write('HTTP/1.0 %s %s\r\n' % (code, resp))

    def sendHeader(self, name, value):
        self.transport.write('%s: %s\r\n' % (name, value))

    def endHeaders(self):
        self.transport.write('\r\n')

    def sendError(self, code, resp=''):
        self.sendStatus(code, resp)
        self.endHeaders()

    def lineReceived(self, line):
        if self.__first_line:
            self.__first_line = 0
            command, request, version = self._parse_command(line)
            self.handleCommand(command, request, version)
            if version == 'HTTP/0.9':
                self.handleEndHeaders()
                self.callHandleEndContent()
        elif line == '':
            if self.__header:
                self.callHandleHeader(self.__header)
            self.__header = ''
            self.handleEndHeaders()
            if self.__length == 0:
                self.callHandleEndContent()
            else:
                self.setRawMode()
        elif line[0] in ' \t':
            self.__header = self.__header+'\n'+line
        else:
            if self.__header:
            	self.callHandleHeader(self.__header)
            self.__header = line


    def callHandleHeader(self, line):
        """Do pre-processing (for content-length) and then call
handleHeader
        for one header line."""
        assert line
        if string.find(string.lower(line), 'content-length: ') == 0:
            self.__length = int(string.strip(string.split(line, ':',
1)[1]))
        self.handleHeader(line)


    def callHandleEndContent(self):
        self.__first_line = 1
>>> be paranoid! and rawDataReceived will leave this != 0 in some cases!
        self.__length = 0
        self.__header = ''
<<<
        self.handleEndContent()


>>> the logic here is pretty fucked, if you ask me
>>> what if we send more bytes than specified in c-length?
>>> note that a post has exactly the speciality of a c-l != 0
>>> a get has not c-l or a cl of 0!
>>> is the setlinemode for keep-alive?
>>> if not, some "print 'extraneous bytes in request'" would be better

    def rawDataReceived(self, data):
        if len(data) < self.__length:
            self.handleContentChunk(data)
            self.__length = self.__length - len(data)
        else:
            self.handleContentChunk(data[:self.__length])
            self.callHandleEndContent()
>>> !!!
				# only pass NONEMPTY strings on
				if len(data) > self.__length:
                self.setLineMode(data[self.__length:])










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