api.py

# Copyright (c) 2012-2016 Jonathan Warren
# Copyright (c) 2012-2018 The Bitmessage developers

"""
This is not what you run to run the Bitmessage API. Instead, enable the API
( https://bitmessage.org/wiki/API ) and optionally enable daemon mode
( https://bitmessage.org/wiki/Daemon ) then run bitmessagemain.py.
"""

import base64
from SimpleXMLRPCServer import SimpleXMLRPCRequestHandler, SimpleXMLRPCServer
import json

from binascii import hexlify, unhexlify

import shared
import time
from datetime import datetime
from addresses import (
    decodeAddress, addBMIfNotPresent, decodeVarint,
    calculateInventoryHash, varintDecodeError)
from bmconfigparser import BMConfigParser
import defaults
import helper_inbox
import helper_sent
import hashlib

import state
import queues
import shutdown
from struct import pack
import network.stats

# Classes
from helper_sql import sqlQuery, sqlExecute, SqlBulkExecute, sqlStoredProcedure
from helper_ackPayload import genAckPayload
from debug import logger
from inventory import Inventory
from version import softwareVersion

# Helper Functions
import proofofwork

str_chan = '[chan]'


class APIError(Exception):
    def __init__(self, error_number, error_message):
        super(APIError, self).__init__()
        self.error_number = error_number
        self.error_message = error_message

    def __str__(self):
        return "API Error %04i: %s" % (self.error_number, self.error_message)


class StoppableXMLRPCServer(SimpleXMLRPCServer):
    allow_reuse_address = True

    def serve_forever(self):
        while state.shutdown == 0:
            self.handle_request()


# This is one of several classes that constitute the API
# This class was written by Vaibhav Bhatia.
# Modified by Jonathan Warren (Atheros).
# http://code.activestate.com/recipes/501148-xmlrpc-serverclient-which-does-cookie-handling-and/
class MySimpleXMLRPCRequestHandler(SimpleXMLRPCRequestHandler):

    def do_POST(self):
        # Handles the HTTP POST request.
        # Attempts to interpret all HTTP POST requests as XML-RPC calls,
        # which are forwarded to the server's _dispatch method for handling.

        # Note: this method is the same as in SimpleXMLRPCRequestHandler,
        # just hacked to handle cookies

        # Check that the path is legal
        if not self.is_rpc_path_valid():
            self.report_404()
            return

        try:
            # Get arguments by reading body of request.
            # We read this in chunks to avoid straining
            # socket.read(); around the 10 or 15Mb mark, some platforms
            # begin to have problems (bug #792570).
            max_chunk_size = 10 * 1024 * 1024
            size_remaining = int(self.headers["content-length"])
            L = []
            while size_remaining:
                chunk_size = min(size_remaining, max_chunk_size)
                L.append(self.rfile.read(chunk_size))
                size_remaining -= len(L[-1])
            data = ''.join(L)

            # In previous versions of SimpleXMLRPCServer, _dispatch
            # could be overridden in this class, instead of in
            # SimpleXMLRPCDispatcher. To maintain backwards compatibility,
            # check to see if a subclass implements _dispatch and dispatch
            # using that method if present.
            response = self.server._marshaled_dispatch(
                data, getattr(self, '_dispatch', None)
            )
        except:  # This should only happen if the module is buggy
            # internal error, report as HTTP server error
            self.send_response(500)
            self.end_headers()
        else:
            # got a valid XML RPC response
            self.send_response(200)
            self.send_header("Content-type", "text/xml")
            self.send_header("Content-length", str(len(response)))

            # HACK :start -> sends cookies here
            if self.cookies:
                for cookie in self.cookies:
                    self.send_header('Set-Cookie', cookie.output(header=''))
            # HACK :end

            self.end_headers()
            self.wfile.write(response)

            # shut down the connection
            self.wfile.flush()
            self.connection.shutdown(1)

    def APIAuthenticateClient(self):
        if 'Authorization' in self.headers:
            # handle Basic authentication
            enctype, encstr = self.headers.get('Authorization').split()
            emailid, password = encstr.decode('base64').split(':')
            return (
                emailid ==
                BMConfigParser().get('bitmessagesettings', 'apiusername')
                and password ==
                BMConfigParser().get('bitmessagesettings', 'apipassword')
            )
        else:
            logger.warning(
                'Authentication failed because header lacks'
                ' Authentication field')
            time.sleep(2)
            return False

        return False

    def _decode(self, text, decode_type):
        try:
            if decode_type == 'hex':
                return unhexlify(text)
            elif decode_type == 'base64':
                return base64.b64decode(text)
        except Exception as e:
            raise APIError(
                22, "Decode error - %s. Had trouble while decoding string: %r"
                % (e, text)
            )

    def _verifyAddress(self, address):
        status, addressVersionNumber, streamNumber, ripe = \
            decodeAddress(address)
        if status != 'success':
            logger.warning(
                'API Error 0007: Could not decode address %s. Status: %s.',
                address, status
            )

            if status == 'checksumfailed':
                raise APIError(8, 'Checksum failed for address: ' + address)
            if status == 'invalidcharacters':
                raise APIError(9, 'Invalid characters in address: ' + address)
            if status == 'versiontoohigh':
                raise APIError(
                    10,
                    'Address version number too high (or zero) in address: '
                    + address
                )
            if status == 'varintmalformed':
                raise APIError(26, 'Malformed varint in address: ' + address)
            raise APIError(
                7, 'Could not decode address: %s : %s' % (address, status))
        if addressVersionNumber < 2 or addressVersionNumber > 4:
            raise APIError(
                11, 'The address version number currently must be 2, 3 or 4.'
                ' Others aren\'t supported. Check the address.'
            )
        if streamNumber != 1:
            raise APIError(
                12, 'The stream number must be 1. Others aren\'t supported.'
                ' Check the address.'
            )

        return (status, addressVersionNumber, streamNumber, ripe)

    # Request Handlers

    def HandleListAddresses(self, method):
        data = '{"addresses":['
        for addressInKeysFile in BMConfigParser().addresses():
            status, addressVersionNumber, streamNumber, hash01 = decodeAddress(
                addressInKeysFile)
            if len(data) > 20:
                data += ','
            if BMConfigParser().has_option(addressInKeysFile, 'chan'):
                chan = BMConfigParser().getboolean(addressInKeysFile, 'chan')
            else:
                chan = False
            label = BMConfigParser().get(addressInKeysFile, 'label')
            if method == 'listAddresses2':
                label = base64.b64encode(label)
            data += json.dumps({
                'label': label,
                'address': addressInKeysFile,
                'stream': streamNumber,
                'enabled':
                BMConfigParser().getboolean(addressInKeysFile, 'enabled'),
                'chan': chan
                }, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleListAddressBookEntries(self, params):
        if len(params) == 1:
            label, = params
            label = self._decode(label, "base64")
            queryreturn = sqlQuery(
                "SELECT label, address from addressbook WHERE label = ?",
                label)
        elif len(params) > 1:
            raise APIError(0, "Too many paremeters, max 1")
        else:
            queryreturn = sqlQuery("SELECT label, address from addressbook")
        data = '{"addresses":['
        for row in queryreturn:
            label, address = row
            label = shared.fixPotentiallyInvalidUTF8Data(label)
            if len(data) > 20:
                data += ','
            data += json.dumps({
                'label': base64.b64encode(label),
                'address': address}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleAddAddressBookEntry(self, params):
        if len(params) != 2:
            raise APIError(0, "I need label and address")
        address, label = params
        label = self._decode(label, "base64")
        address = addBMIfNotPresent(address)
        self._verifyAddress(address)
        queryreturn = sqlQuery(
            "SELECT address FROM addressbook WHERE address=?", address)
        if queryreturn != []:
            raise APIError(
                16, 'You already have this address in your address book.')

        sqlExecute("INSERT INTO addressbook VALUES(?,?)", label, address)
        queues.UISignalQueue.put(('rerenderMessagelistFromLabels', ''))
        queues.UISignalQueue.put(('rerenderMessagelistToLabels', ''))
        queues.UISignalQueue.put(('rerenderAddressBook', ''))
        return "Added address %s to address book" % address

    def HandleDeleteAddressBookEntry(self, params):
        if len(params) != 1:
            raise APIError(0, "I need an address")
        address, = params
        address = addBMIfNotPresent(address)
        self._verifyAddress(address)
        sqlExecute('DELETE FROM addressbook WHERE address=?', address)
        queues.UISignalQueue.put(('rerenderMessagelistFromLabels', ''))
        queues.UISignalQueue.put(('rerenderMessagelistToLabels', ''))
        queues.UISignalQueue.put(('rerenderAddressBook', ''))
        return "Deleted address book entry for %s if it existed" % address

    def HandleCreateRandomAddress(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        elif len(params) == 1:
            label, = params
            eighteenByteRipe = False
            nonceTrialsPerByte = BMConfigParser().get(
                'bitmessagesettings', 'defaultnoncetrialsperbyte')
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 2:
            label, eighteenByteRipe = params
            nonceTrialsPerByte = BMConfigParser().get(
                'bitmessagesettings', 'defaultnoncetrialsperbyte')
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 3:
            label, eighteenByteRipe, totalDifficulty = params
            nonceTrialsPerByte = int(
                defaults.networkDefaultProofOfWorkNonceTrialsPerByte
                * totalDifficulty)
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 4:
            label, eighteenByteRipe, totalDifficulty, \
                smallMessageDifficulty = params
            nonceTrialsPerByte = int(
                defaults.networkDefaultProofOfWorkNonceTrialsPerByte
                * totalDifficulty)
            payloadLengthExtraBytes = int(
                defaults.networkDefaultPayloadLengthExtraBytes
                * smallMessageDifficulty)
        else:
            raise APIError(0, 'Too many parameters!')
        label = self._decode(label, "base64")
        try:
            unicode(label, 'utf-8')
        except:
            raise APIError(17, 'Label is not valid UTF-8 data.')
        queues.apiAddressGeneratorReturnQueue.queue.clear()
        streamNumberForAddress = 1
        queues.addressGeneratorQueue.put((
            'createRandomAddress', 4, streamNumberForAddress, label, 1, "",
            eighteenByteRipe, nonceTrialsPerByte, payloadLengthExtraBytes
        ))
        return queues.apiAddressGeneratorReturnQueue.get()

    def HandleCreateDeterministicAddresses(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        elif len(params) == 1:
            passphrase, = params
            numberOfAddresses = 1
            addressVersionNumber = 0
            streamNumber = 0
            eighteenByteRipe = False
            nonceTrialsPerByte = BMConfigParser().get(
                'bitmessagesettings', 'defaultnoncetrialsperbyte')
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 2:
            passphrase, numberOfAddresses = params
            addressVersionNumber = 0
            streamNumber = 0
            eighteenByteRipe = False
            nonceTrialsPerByte = BMConfigParser().get(
                'bitmessagesettings', 'defaultnoncetrialsperbyte')
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 3:
            passphrase, numberOfAddresses, addressVersionNumber = params
            streamNumber = 0
            eighteenByteRipe = False
            nonceTrialsPerByte = BMConfigParser().get(
                'bitmessagesettings', 'defaultnoncetrialsperbyte')
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 4:
            passphrase, numberOfAddresses, addressVersionNumber, \
                streamNumber = params
            eighteenByteRipe = False
            nonceTrialsPerByte = BMConfigParser().get(
                'bitmessagesettings', 'defaultnoncetrialsperbyte')
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 5:
            passphrase, numberOfAddresses, addressVersionNumber, \
                streamNumber, eighteenByteRipe = params
            nonceTrialsPerByte = BMConfigParser().get(
                'bitmessagesettings', 'defaultnoncetrialsperbyte')
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 6:
            passphrase, numberOfAddresses, addressVersionNumber, \
                streamNumber, eighteenByteRipe, totalDifficulty = params
            nonceTrialsPerByte = int(
                defaults.networkDefaultProofOfWorkNonceTrialsPerByte
                * totalDifficulty)
            payloadLengthExtraBytes = BMConfigParser().get(
                'bitmessagesettings', 'defaultpayloadlengthextrabytes')
        elif len(params) == 7:
            passphrase, numberOfAddresses, addressVersionNumber, \
                streamNumber, eighteenByteRipe, totalDifficulty, \
                smallMessageDifficulty = params
            nonceTrialsPerByte = int(
                defaults.networkDefaultProofOfWorkNonceTrialsPerByte
                * totalDifficulty)
            payloadLengthExtraBytes = int(
                defaults.networkDefaultPayloadLengthExtraBytes
                * smallMessageDifficulty)
        else:
            raise APIError(0, 'Too many parameters!')
        if len(passphrase) == 0:
            raise APIError(1, 'The specified passphrase is blank.')
        if not isinstance(eighteenByteRipe, bool):
            raise APIError(
                23, 'Bool expected in eighteenByteRipe, saw %s instead' %
                type(eighteenByteRipe))
        passphrase = self._decode(passphrase, "base64")
        # 0 means "just use the proper addressVersionNumber"
        if addressVersionNumber == 0:
            addressVersionNumber = 4
        if addressVersionNumber != 3 and addressVersionNumber != 4:
            raise APIError(
                2, 'The address version number currently must be 3, 4, or 0'
                ' (which means auto-select). %i isn\'t supported.' %
                addressVersionNumber)
        if streamNumber == 0:  # 0 means "just use the most available stream"
            streamNumber = 1
        if streamNumber != 1:
            raise APIError(
                3, 'The stream number must be 1 (or 0 which means'
                ' auto-select). Others aren\'t supported.')
        if numberOfAddresses == 0:
            raise APIError(
                4, 'Why would you ask me to generate 0 addresses for you?')
        if numberOfAddresses > 999:
            raise APIError(
                5, 'You have (accidentally?) specified too many addresses to'
                ' make. Maximum 999. This check only exists to prevent'
                ' mischief; if you really want to create more addresses than'
                ' this, contact the Bitmessage developers and we can modify'
                ' the check or you can do it yourself by searching the source'
                ' code for this message.')
        queues.apiAddressGeneratorReturnQueue.queue.clear()
        logger.debug(
            'Requesting that the addressGenerator create %s addresses.',
            numberOfAddresses)
        queues.addressGeneratorQueue.put((
            'createDeterministicAddresses', addressVersionNumber, streamNumber,
            'unused API address', numberOfAddresses, passphrase,
            eighteenByteRipe, nonceTrialsPerByte, payloadLengthExtraBytes
        ))
        data = '{"addresses":['
        queueReturn = queues.apiAddressGeneratorReturnQueue.get()
        for item in queueReturn:
            if len(data) > 20:
                data += ','
            data += "\"" + item + "\""
        data += ']}'
        return data

    def HandleGetDeterministicAddress(self, params):
        if len(params) != 3:
            raise APIError(0, 'I need exactly 3 parameters.')
        passphrase, addressVersionNumber, streamNumber = params
        numberOfAddresses = 1
        eighteenByteRipe = False
        if len(passphrase) == 0:
            raise APIError(1, 'The specified passphrase is blank.')
        passphrase = self._decode(passphrase, "base64")
        if addressVersionNumber != 3 and addressVersionNumber != 4:
            raise APIError(
                2, 'The address version number currently must be 3 or 4. %i'
                ' isn\'t supported.' % addressVersionNumber)
        if streamNumber != 1:
            raise APIError(
                3, ' The stream number must be 1. Others aren\'t supported.')
        queues.apiAddressGeneratorReturnQueue.queue.clear()
        logger.debug(
            'Requesting that the addressGenerator create %s addresses.',
            numberOfAddresses)
        queues.addressGeneratorQueue.put((
            'getDeterministicAddress', addressVersionNumber, streamNumber,
            'unused API address', numberOfAddresses, passphrase,
            eighteenByteRipe
        ))
        return queues.apiAddressGeneratorReturnQueue.get()

    def HandleCreateChan(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters.')
        elif len(params) == 1:
            passphrase, = params
        passphrase = self._decode(passphrase, "base64")
        if len(passphrase) == 0:
            raise APIError(1, 'The specified passphrase is blank.')
        # It would be nice to make the label the passphrase but it is
        # possible that the passphrase contains non-utf-8 characters.
        try:
            unicode(passphrase, 'utf-8')
            label = str_chan + ' ' + passphrase
        except:
            label = str_chan + ' ' + repr(passphrase)

        addressVersionNumber = 4
        streamNumber = 1
        queues.apiAddressGeneratorReturnQueue.queue.clear()
        logger.debug(
            'Requesting that the addressGenerator create chan %s.', passphrase)
        queues.addressGeneratorQueue.put((
            'createChan', addressVersionNumber, streamNumber, label,
            passphrase, True
        ))
        queueReturn = queues.apiAddressGeneratorReturnQueue.get()
        if len(queueReturn) == 0:
            raise APIError(24, 'Chan address is already present.')
        address = queueReturn[0]
        return address

    def HandleJoinChan(self, params):
        if len(params) < 2:
            raise APIError(0, 'I need two parameters.')
        elif len(params) == 2:
            passphrase, suppliedAddress = params
        passphrase = self._decode(passphrase, "base64")
        if len(passphrase) == 0:
            raise APIError(1, 'The specified passphrase is blank.')
        # It would be nice to make the label the passphrase but it is
        # possible that the passphrase contains non-utf-8 characters.
        try:
            unicode(passphrase, 'utf-8')
            label = str_chan + ' ' + passphrase
        except:
            label = str_chan + ' ' + repr(passphrase)

        status, addressVersionNumber, streamNumber, toRipe = \
            self._verifyAddress(suppliedAddress)
        suppliedAddress = addBMIfNotPresent(suppliedAddress)
        queues.apiAddressGeneratorReturnQueue.queue.clear()
        queues.addressGeneratorQueue.put((
            'joinChan', suppliedAddress, label, passphrase, True
        ))
        addressGeneratorReturnValue = \
            queues.apiAddressGeneratorReturnQueue.get()

        if addressGeneratorReturnValue[0] == \
                'chan name does not match address':
            raise APIError(18, 'Chan name does not match address.')
        if len(addressGeneratorReturnValue) == 0:
            raise APIError(24, 'Chan address is already present.')
        # TODO: this variable is not used to anything
        # in case we ever want it for anything.
        # createdAddress = addressGeneratorReturnValue[0]
        return "success"

    def HandleLeaveChan(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters.')
        elif len(params) == 1:
            address, = params
        status, addressVersionNumber, streamNumber, toRipe = \
            self._verifyAddress(address)
        address = addBMIfNotPresent(address)
        if not BMConfigParser().has_section(address):
            raise APIError(
                13, 'Could not find this address in your keys.dat file.')
        if not BMConfigParser().safeGetBoolean(address, 'chan'):
            raise APIError(
                25, 'Specified address is not a chan address.'
                ' Use deleteAddress API call instead.')
        BMConfigParser().remove_section(address)
        with open(state.appdata + 'keys.dat', 'wb') as configfile:
            BMConfigParser().write(configfile)
        return 'success'

    def HandleDeleteAddress(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters.')
        elif len(params) == 1:
            address, = params
        status, addressVersionNumber, streamNumber, toRipe = \
            self._verifyAddress(address)
        address = addBMIfNotPresent(address)
        if not BMConfigParser().has_section(address):
            raise APIError(
                13, 'Could not find this address in your keys.dat file.')
        BMConfigParser().remove_section(address)
        with open(state.appdata + 'keys.dat', 'wb') as configfile:
            BMConfigParser().write(configfile)
        queues.UISignalQueue.put(('rerenderMessagelistFromLabels', ''))
        queues.UISignalQueue.put(('rerenderMessagelistToLabels', ''))
        shared.reloadMyAddressHashes()
        return 'success'

    def HandleGetAllInboxMessages(self, params):
        queryreturn = sqlQuery(
            "SELECT msgid, toaddress, fromaddress, subject, received, message,"
            " encodingtype, read FROM inbox where folder='inbox'"
            " ORDER BY received"
        )
        data = '{"inboxMessages":['
        for row in queryreturn:
            msgid, toAddress, fromAddress, subject, received, message, \
                encodingtype, read = row
            subject = shared.fixPotentiallyInvalidUTF8Data(subject)
            message = shared.fixPotentiallyInvalidUTF8Data(message)
            if len(data) > 25:
                data += ','
            data += json.dumps({
                'msgid': hexlify(msgid),
                'toAddress': toAddress,
                'fromAddress': fromAddress,
                'subject': base64.b64encode(subject),
                'message': base64.b64encode(message),
                'encodingType': encodingtype,
                'receivedTime': received,
                'read': read}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleGetAllInboxMessageIds(self, params):
        queryreturn = sqlQuery(
            "SELECT msgid FROM inbox where folder='inbox' ORDER BY received")
        data = '{"inboxMessageIds":['
        for row in queryreturn:
            msgid = row[0]
            if len(data) > 25:
                data += ','
            data += json.dumps(
                {'msgid': hexlify(msgid)}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleGetInboxMessageById(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        elif len(params) == 1:
            msgid = self._decode(params[0], "hex")
        elif len(params) >= 2:
            msgid = self._decode(params[0], "hex")
            readStatus = params[1]
            if not isinstance(readStatus, bool):
                raise APIError(
                    23, 'Bool expected in readStatus, saw %s instead.' %
                    type(readStatus))
            queryreturn = sqlQuery(
                "SELECT read FROM inbox WHERE msgid=?", msgid)
            # UPDATE is slow, only update if status is different
            if queryreturn != [] and (queryreturn[0][0] == 1) != readStatus:
                sqlExecute(
                    "UPDATE inbox set read = ? WHERE msgid=?",
                    readStatus, msgid)
                queues.UISignalQueue.put(('changedInboxUnread', None))
        queryreturn = sqlQuery(
            "SELECT msgid, toaddress, fromaddress, subject, received, message,"
            " encodingtype, read FROM inbox WHERE msgid=?", msgid
        )
        data = '{"inboxMessage":['
        for row in queryreturn:
            msgid, toAddress, fromAddress, subject, received, message, \
                encodingtype, read = row
            subject = shared.fixPotentiallyInvalidUTF8Data(subject)
            message = shared.fixPotentiallyInvalidUTF8Data(message)
            data += json.dumps({
                'msgid': hexlify(msgid),
                'toAddress': toAddress,
                'fromAddress': fromAddress,
                'subject': base64.b64encode(subject),
                'message': base64.b64encode(message),
                'encodingType': encodingtype,
                'receivedTime': received,
                'read': read}, indent=4, separators=(',', ': '))
            data += ']}'
            return data

    def HandleGetAllSentMessages(self, params):
        queryreturn = sqlQuery(
            "SELECT msgid, toaddress, fromaddress, subject, lastactiontime,"
            " message, encodingtype, status, ackdata FROM sent"
            " WHERE folder='sent' ORDER BY lastactiontime"
        )
        data = '{"sentMessages":['
        for row in queryreturn:
            msgid, toAddress, fromAddress, subject, lastactiontime, message, \
                encodingtype, status, ackdata = row
            subject = shared.fixPotentiallyInvalidUTF8Data(subject)
            message = shared.fixPotentiallyInvalidUTF8Data(message)
            if len(data) > 25:
                data += ','
            data += json.dumps({
                'msgid': hexlify(msgid),
                'toAddress': toAddress,
                'fromAddress': fromAddress,
                'subject': base64.b64encode(subject),
                'message': base64.b64encode(message),
                'encodingType': encodingtype,
                'lastActionTime': lastactiontime,
                'status': status,
                'ackData': hexlify(ackdata)}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleGetAllSentMessageIds(self, params):
        queryreturn = sqlQuery(
            "SELECT msgid FROM sent where folder='sent'"
            " ORDER BY lastactiontime"
        )
        data = '{"sentMessageIds":['
        for row in queryreturn:
            msgid = row[0]
            if len(data) > 25:
                data += ','
            data += json.dumps(
                {'msgid': hexlify(msgid)}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleInboxMessagesByReceiver(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        toAddress = params[0]
        queryreturn = sqlQuery(
            "SELECT msgid, toaddress, fromaddress, subject, received, message,"
            " encodingtype FROM inbox WHERE folder='inbox' AND toAddress=?",
            toAddress)
        data = '{"inboxMessages":['
        for row in queryreturn:
            msgid, toAddress, fromAddress, subject, received, message, \
                encodingtype = row
            subject = shared.fixPotentiallyInvalidUTF8Data(subject)
            message = shared.fixPotentiallyInvalidUTF8Data(message)
            if len(data) > 25:
                data += ','
            data += json.dumps({
                'msgid': hexlify(msgid),
                'toAddress': toAddress,
                'fromAddress': fromAddress,
                'subject': base64.b64encode(subject),
                'message': base64.b64encode(message),
                'encodingType': encodingtype,
                'receivedTime': received}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleGetSentMessageById(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        msgid = self._decode(params[0], "hex")
        queryreturn = sqlQuery(
            "SELECT msgid, toaddress, fromaddress, subject, lastactiontime,"
            " message, encodingtype, status, ackdata FROM sent WHERE msgid=?",
            msgid
        )
        data = '{"sentMessage":['
        for row in queryreturn:
            msgid, toAddress, fromAddress, subject, lastactiontime, message, \
                encodingtype, status, ackdata = row
            subject = shared.fixPotentiallyInvalidUTF8Data(subject)
            message = shared.fixPotentiallyInvalidUTF8Data(message)
            data += json.dumps({
                'msgid': hexlify(msgid),
                'toAddress': toAddress,
                'fromAddress': fromAddress,
                'subject': base64.b64encode(subject),
                'message': base64.b64encode(message),
                'encodingType': encodingtype,
                'lastActionTime': lastactiontime,
                'status': status,
                'ackData': hexlify(ackdata)}, indent=4, separators=(',', ': '))
            data += ']}'
            return data

    def HandleGetSentMessagesByAddress(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        fromAddress = params[0]
        queryreturn = sqlQuery(
            "SELECT msgid, toaddress, fromaddress, subject, lastactiontime,"
            " message, encodingtype, status, ackdata FROM sent"
            " WHERE folder='sent' AND fromAddress=? ORDER BY lastactiontime",
            fromAddress
        )
        data = '{"sentMessages":['
        for row in queryreturn:
            msgid, toAddress, fromAddress, subject, lastactiontime, message, \
                encodingtype, status, ackdata = row
            subject = shared.fixPotentiallyInvalidUTF8Data(subject)
            message = shared.fixPotentiallyInvalidUTF8Data(message)
            if len(data) > 25:
                data += ','
            data += json.dumps({
                'msgid': hexlify(msgid),
                'toAddress': toAddress,
                'fromAddress': fromAddress,
                'subject': base64.b64encode(subject),
                'message': base64.b64encode(message),
                'encodingType': encodingtype,
                'lastActionTime': lastactiontime,
                'status': status,
                'ackData': hexlify(ackdata)}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleGetSentMessagesByAckData(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        ackData = self._decode(params[0], "hex")
        queryreturn = sqlQuery(
            "SELECT msgid, toaddress, fromaddress, subject, lastactiontime,"
            " message, encodingtype, status, ackdata FROM sent"
            " WHERE ackdata=?", ackData
        )
        data = '{"sentMessage":['
        for row in queryreturn:
            msgid, toAddress, fromAddress, subject, lastactiontime, message, \
                encodingtype, status, ackdata = row
            subject = shared.fixPotentiallyInvalidUTF8Data(subject)
            message = shared.fixPotentiallyInvalidUTF8Data(message)
            data += json.dumps({
                'msgid': hexlify(msgid),
                'toAddress': toAddress,
                'fromAddress': fromAddress,
                'subject': base64.b64encode(subject),
                'message': base64.b64encode(message),
                'encodingType': encodingtype,
                'lastActionTime': lastactiontime,
                'status': status,
                'ackData': hexlify(ackdata)}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleTrashMessage(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        msgid = self._decode(params[0], "hex")

        # Trash if in inbox table
        helper_inbox.trash(msgid)
        # Trash if in sent table
        sqlExecute('''UPDATE sent SET folder='trash' WHERE msgid=?''', msgid)
        return 'Trashed message (assuming message existed).'

    def HandleTrashInboxMessage(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        msgid = self._decode(params[0], "hex")
        helper_inbox.trash(msgid)
        return 'Trashed inbox message (assuming message existed).'

    def HandleTrashSentMessage(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        msgid = self._decode(params[0], "hex")
        sqlExecute('''UPDATE sent SET folder='trash' WHERE msgid=?''', msgid)
        return 'Trashed sent message (assuming message existed).'

    def HandleSendMessage(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        elif len(params) == 4:
            toAddress, fromAddress, subject, message = params
            encodingType = 2
            TTL = 4 * 24 * 60 * 60
        elif len(params) == 5:
            toAddress, fromAddress, subject, message, encodingType = params
            TTL = 4 * 24 * 60 * 60
        elif len(params) == 6:
            toAddress, fromAddress, subject, message, encodingType, TTL = \
                params
        if encodingType not in [2, 3]:
            raise APIError(6, 'The encoding type must be 2 or 3.')
        subject = self._decode(subject, "base64")
        message = self._decode(message, "base64")
        if len(subject + message) > (2 ** 18 - 500):
            raise APIError(27, 'Message is too long.')
        if TTL < 60 * 60:
            TTL = 60 * 60
        if TTL > 28 * 24 * 60 * 60:
            TTL = 28 * 24 * 60 * 60
        toAddress = addBMIfNotPresent(toAddress)
        fromAddress = addBMIfNotPresent(fromAddress)
        status, addressVersionNumber, streamNumber, toRipe = \
            self._verifyAddress(toAddress)
        self._verifyAddress(fromAddress)
        try:
            fromAddressEnabled = BMConfigParser().getboolean(
                fromAddress, 'enabled')
        except:
            raise APIError(
                13, 'Could not find your fromAddress in the keys.dat file.')
        if not fromAddressEnabled:
            raise APIError(14, 'Your fromAddress is disabled. Cannot send.')

        stealthLevel = BMConfigParser().safeGetInt(
            'bitmessagesettings', 'ackstealthlevel')
        ackdata = genAckPayload(streamNumber, stealthLevel)

        t = ('',
             toAddress,
             toRipe,
             fromAddress,
             subject,
             message,
             ackdata,
             int(time.time()),  # sentTime (this won't change)
             int(time.time()),  # lastActionTime
             0,
             'msgqueued',
             0,
             'sent',
             2,
             TTL)
        helper_sent.insert(t)

        toLabel = ''
        queryreturn = sqlQuery(
            "SELECT label FROM addressbook WHERE address=?", toAddress)
        if queryreturn != []:
            for row in queryreturn:
                toLabel, = row
        # apiSignalQueue.put(('displayNewSentMessage',(toAddress,toLabel,fromAddress,subject,message,ackdata)))
        queues.UISignalQueue.put(('displayNewSentMessage', (
            toAddress, toLabel, fromAddress, subject, message, ackdata)))

        queues.workerQueue.put(('sendmessage', toAddress))

        return hexlify(ackdata)

    def HandleSendBroadcast(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        if len(params) == 3:
            fromAddress, subject, message = params
            encodingType = 2
            TTL = 4 * 24 * 60 * 60
        elif len(params) == 4:
            fromAddress, subject, message, encodingType = params
            TTL = 4 * 24 * 60 * 60
        elif len(params) == 5:
            fromAddress, subject, message, encodingType, TTL = params
        if encodingType not in [2, 3]:
            raise APIError(6, 'The encoding type must be 2 or 3.')
        subject = self._decode(subject, "base64")
        message = self._decode(message, "base64")
        if len(subject + message) > (2 ** 18 - 500):
            raise APIError(27, 'Message is too long.')
        if TTL < 60 * 60:
            TTL = 60 * 60
        if TTL > 28 * 24 * 60 * 60:
            TTL = 28 * 24 * 60 * 60
        fromAddress = addBMIfNotPresent(fromAddress)
        self._verifyAddress(fromAddress)
        try:
            BMConfigParser().getboolean(fromAddress, 'enabled')
        except:
            raise APIError(
                13, 'could not find your fromAddress in the keys.dat file.')
        streamNumber = decodeAddress(fromAddress)[2]
        ackdata = genAckPayload(streamNumber, 0)
        toAddress = '[Broadcast subscribers]'
        ripe = ''

        t = ('',
             toAddress,
             ripe,
             fromAddress,
             subject,
             message,
             ackdata,
             int(time.time()),  # sentTime (this doesn't change)
             int(time.time()),  # lastActionTime
             0,
             'broadcastqueued',
             0,
             'sent',
             2,
             TTL)
        helper_sent.insert(t)

        toLabel = '[Broadcast subscribers]'
        queues.UISignalQueue.put(('displayNewSentMessage', (
            toAddress, toLabel, fromAddress, subject, message, ackdata)))
        queues.workerQueue.put(('sendbroadcast', ''))

        return hexlify(ackdata)

    def HandleGetStatus(self, params):
        if len(params) != 1:
            raise APIError(0, 'I need one parameter!')
        ackdata, = params
        if len(ackdata) != 64:
            raise APIError(
                15, 'The length of ackData should be 32 bytes (encoded in hex'
                ' thus 64 characters).')
        ackdata = self._decode(ackdata, "hex")
        queryreturn = sqlQuery(
            "SELECT status FROM sent where ackdata=?", ackdata)
        if queryreturn == []:
            return 'notfound'
        for row in queryreturn:
            status, = row
            return status

    def HandleAddSubscription(self, params):
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        if len(params) == 1:
            address, = params
            label = ''
        if len(params) == 2:
            address, label = params
            label = self._decode(label, "base64")
            try:
                unicode(label, 'utf-8')
            except:
                raise APIError(17, 'Label is not valid UTF-8 data.')
        if len(params) > 2:
            raise APIError(0, 'I need either 1 or 2 parameters!')
        address = addBMIfNotPresent(address)
        self._verifyAddress(address)
        # First we must check to see if the address is already in the
        # subscriptions list.
        queryreturn = sqlQuery(
            "SELECT * FROM subscriptions WHERE address=?", address)
        if queryreturn != []:
            raise APIError(16, 'You are already subscribed to that address.')
        sqlExecute(
            "INSERT INTO subscriptions VALUES (?,?,?)", label, address, True)
        shared.reloadBroadcastSendersForWhichImWatching()
        queues.UISignalQueue.put(('rerenderMessagelistFromLabels', ''))
        queues.UISignalQueue.put(('rerenderSubscriptions', ''))
        return 'Added subscription.'

    def HandleDeleteSubscription(self, params):
        if len(params) != 1:
            raise APIError(0, 'I need 1 parameter!')
        address, = params
        address = addBMIfNotPresent(address)
        sqlExecute('''DELETE FROM subscriptions WHERE address=?''', address)
        shared.reloadBroadcastSendersForWhichImWatching()
        queues.UISignalQueue.put(('rerenderMessagelistFromLabels', ''))
        queues.UISignalQueue.put(('rerenderSubscriptions', ''))
        return 'Deleted subscription if it existed.'

    def ListSubscriptions(self, params):
        queryreturn = sqlQuery(
            "SELECT label, address, enabled FROM subscriptions")
        data = {'subscriptions': []}
        for row in queryreturn:
            label, address, enabled = row
            label = shared.fixPotentiallyInvalidUTF8Data(label)
            data['subscriptions'].append({
                'label': base64.b64encode(label),
                'address': address,
                'enabled': enabled == 1
            })
        return json.dumps(data, indent=4, separators=(',', ': '))

    def HandleDisseminatePreEncryptedMsg(self, params):
        # The device issuing this command to PyBitmessage supplies a msg
        # object that has already been encrypted but which still needs the POW
        # to be done. PyBitmessage accepts this msg object and sends it out
        # to the rest of the Bitmessage network as if it had generated
        # the message itself. Please do not yet add this to the api doc.
        if len(params) != 3:
            raise APIError(0, 'I need 3 parameter!')
        encryptedPayload, requiredAverageProofOfWorkNonceTrialsPerByte, \
            requiredPayloadLengthExtraBytes = params
        encryptedPayload = self._decode(encryptedPayload, "hex")
        # Let us do the POW and attach it to the front
        target = 2**64 / (
            (len(encryptedPayload) + requiredPayloadLengthExtraBytes + 8)
            * requiredAverageProofOfWorkNonceTrialsPerByte)
        with shared.printLock:
            print '(For msg message via API) Doing proof of work. Total required difficulty:', float(requiredAverageProofOfWorkNonceTrialsPerByte) / defaults.networkDefaultProofOfWorkNonceTrialsPerByte, 'Required small message difficulty:', float(requiredPayloadLengthExtraBytes) / defaults.networkDefaultPayloadLengthExtraBytes
        powStartTime = time.time()
        initialHash = hashlib.sha512(encryptedPayload).digest()
        trialValue, nonce = proofofwork.run(target, initialHash)
        with shared.printLock:
            print '(For msg message via API) Found proof of work', trialValue, 'Nonce:', nonce
            try:
                print 'POW took', int(time.time() - powStartTime), 'seconds.', nonce / (time.time() - powStartTime), 'nonce trials per second.'
            except:
                pass
        encryptedPayload = pack('>Q', nonce) + encryptedPayload
        toStreamNumber = decodeVarint(encryptedPayload[16:26])[0]
        inventoryHash = calculateInventoryHash(encryptedPayload)
        objectType = 2
        TTL = 2.5 * 24 * 60 * 60
        Inventory()[inventoryHash] = (
            objectType, toStreamNumber, encryptedPayload,
            int(time.time()) + TTL, ''
        )
        with shared.printLock:
            print 'Broadcasting inv for msg(API disseminatePreEncryptedMsg command):', hexlify(inventoryHash)
        queues.invQueue.put((toStreamNumber, inventoryHash))

    def HandleTrashSentMessageByAckDAta(self, params):
        # This API method should only be used when msgid is not available
        if len(params) == 0:
            raise APIError(0, 'I need parameters!')
        ackdata = self._decode(params[0], "hex")
        sqlExecute("UPDATE sent SET folder='trash' WHERE ackdata=?", ackdata)
        return 'Trashed sent message (assuming message existed).'

    def HandleDissimatePubKey(self, params):
        # The device issuing this command to PyBitmessage supplies a pubkey
        # object to be disseminated to the rest of the Bitmessage network.
        # PyBitmessage accepts this pubkey object and sends it out to the rest
        # of the Bitmessage network as if it had generated the pubkey object
        # itself. Please do not yet add this to the api doc.
        if len(params) != 1:
            raise APIError(0, 'I need 1 parameter!')
        payload, = params
        payload = self._decode(payload, "hex")

        # Let us do the POW
        target = 2 ** 64 / (
            (len(payload) + defaults.networkDefaultPayloadLengthExtraBytes
             + 8) * defaults.networkDefaultProofOfWorkNonceTrialsPerByte)
        print '(For pubkey message via API) Doing proof of work...'
        initialHash = hashlib.sha512(payload).digest()
        trialValue, nonce = proofofwork.run(target, initialHash)
        print '(For pubkey message via API) Found proof of work', trialValue, 'Nonce:', nonce
        payload = pack('>Q', nonce) + payload

        pubkeyReadPosition = 8  # bypass the nonce
        if payload[pubkeyReadPosition:pubkeyReadPosition+4] == \
                '\x00\x00\x00\x00':  # if this pubkey uses 8 byte time
            pubkeyReadPosition += 8
        else:
            pubkeyReadPosition += 4
        addressVersion, addressVersionLength = decodeVarint(
            payload[pubkeyReadPosition:pubkeyReadPosition+10])
        pubkeyReadPosition += addressVersionLength
        pubkeyStreamNumber = decodeVarint(
            payload[pubkeyReadPosition:pubkeyReadPosition+10])[0]
        inventoryHash = calculateInventoryHash(payload)
        objectType = 1  # TODO: support v4 pubkeys
        TTL = 28 * 24 * 60 * 60
        Inventory()[inventoryHash] = (
            objectType, pubkeyStreamNumber, payload, int(time.time()) + TTL, ''
        )
        with shared.printLock:
            print 'broadcasting inv within API command disseminatePubkey with hash:', hexlify(inventoryHash)
        queues.invQueue.put((pubkeyStreamNumber, inventoryHash))

    def HandleGetMessageDataByDestinationHash(self, params):
        # Method will eventually be used by a particular Android app to
        # select relevant messages. Do not yet add this to the api
        # doc.
        if len(params) != 1:
            raise APIError(0, 'I need 1 parameter!')
        requestedHash, = params
        if len(requestedHash) != 32:
            raise APIError(
                19, 'The length of hash should be 32 bytes (encoded in hex'
                ' thus 64 characters).')
        requestedHash = self._decode(requestedHash, "hex")

        # This is not a particularly commonly used API function. Before we
        # use it we'll need to fill out a field in our inventory database
        # which is blank by default (first20bytesofencryptedmessage).
        queryreturn = sqlQuery(
            "SELECT hash, payload FROM inventory WHERE tag = ''"
            " and objecttype = 2")
        with SqlBulkExecute() as sql:
            for row in queryreturn:
                hash01, payload = row
                readPosition = 16  # Nonce length + time length
                # Stream Number length
                readPosition += decodeVarint(
                    payload[readPosition:readPosition+10])[1]
                t = (payload[readPosition:readPosition+32], hash01)
                sql.execute("UPDATE inventory SET tag=? WHERE hash=?", *t)

        queryreturn = sqlQuery(
            "SELECT payload FROM inventory WHERE tag = ?", requestedHash)
        data = '{"receivedMessageDatas":['
        for row in queryreturn:
            payload, = row
            if len(data) > 25:
                data += ','
            data += json.dumps(
                {'data': hexlify(payload)}, indent=4, separators=(',', ': '))
        data += ']}'
        return data

    def HandleClientStatus(self, params):
        if len(network.stats.connectedHostsList()) == 0:
            networkStatus = 'notConnected'
        elif len(network.stats.connectedHostsList()) > 0 \
                and not shared.clientHasReceivedIncomingConnections:
            networkStatus = 'connectedButHaveNotReceivedIncomingConnections'
        else:
            networkStatus = 'connectedAndReceivingIncomingConnections'
        return json.dumps({
            'networkConnections': len(network.stats.connectedHostsList()),
            'numberOfMessagesProcessed': shared.numberOfMessagesProcessed,
            'numberOfBroadcastsProcessed': shared.numberOfBroadcastsProcessed,
            'numberOfPubkeysProcessed': shared.numberOfPubkeysProcessed,
            'networkStatus': networkStatus,
            'softwareName': 'PyBitmessage',
            'softwareVersion': softwareVersion
            }, indent=4, separators=(',', ': '))

    def HandleDecodeAddress(self, params):
        # Return a meaningful decoding of an address.
        if len(params) != 1:
            raise APIError(0, 'I need 1 parameter!')
        address, = params
        status, addressVersion, streamNumber, ripe = decodeAddress(address)
        return json.dumps({
            'status': status,
            'addressVersion': addressVersion,
            'streamNumber': streamNumber,
            'ripe': base64.b64encode(ripe)
            }, indent=4, separators=(',', ': '))

    def HandleHelloWorld(self, params):
        a, b = params
        return a + '-' + b

    def HandleAdd(self, params):
        a, b = params
        return a + b

    def HandleStatusBar(self, params):
        message, = params
        queues.UISignalQueue.put(('updateStatusBar', message))

    def HandleDeleteAndVacuum(self, params):
        if not params:
            sqlStoredProcedure('deleteandvacuume')
            return 'done'

    def HandleShutdown(self, params):
        if not params:
            shutdown.doCleanShutdown()
            return 'done'

    handlers = {}
    handlers['helloWorld'] = HandleHelloWorld
    handlers['add'] = HandleAdd
    handlers['statusBar'] = HandleStatusBar
    handlers['listAddresses'] = HandleListAddresses
    handlers['listAddressBookEntries'] = HandleListAddressBookEntries
    # the listAddressbook alias should be removed eventually.
    handlers['listAddressbook'] = HandleListAddressBookEntries
    handlers['addAddressBookEntry'] = HandleAddAddressBookEntry
    # the addAddressbook alias should be deleted eventually.
    handlers['addAddressbook'] = HandleAddAddressBookEntry
    handlers['deleteAddressBookEntry'] = HandleDeleteAddressBookEntry
    # The deleteAddressbook alias should be deleted eventually.
    handlers['deleteAddressbook'] = HandleDeleteAddressBookEntry
    handlers['createRandomAddress'] = HandleCreateRandomAddress
    handlers['createDeterministicAddresses'] = \
        HandleCreateDeterministicAddresses
    handlers['getDeterministicAddress'] = HandleGetDeterministicAddress
    handlers['createChan'] = HandleCreateChan
    handlers['joinChan'] = HandleJoinChan
    handlers['leaveChan'] = HandleLeaveChan
    handlers['deleteAddress'] = HandleDeleteAddress
    handlers['getAllInboxMessages'] = HandleGetAllInboxMessages
    handlers['getAllInboxMessageIds'] = HandleGetAllInboxMessageIds
    handlers['getAllInboxMessageIDs'] = HandleGetAllInboxMessageIds
    handlers['getInboxMessageById'] = HandleGetInboxMessageById
    handlers['getInboxMessageByID'] = HandleGetInboxMessageById
    handlers['getAllSentMessages'] = HandleGetAllSentMessages
    handlers['getAllSentMessageIds'] = HandleGetAllSentMessageIds
    handlers['getAllSentMessageIDs'] = HandleGetAllSentMessageIds
    handlers['getInboxMessagesByReceiver'] = HandleInboxMessagesByReceiver
    # after some time getInboxMessagesByAddress should be removed
    handlers['getInboxMessagesByAddress'] = HandleInboxMessagesByReceiver
    handlers['getSentMessageById'] = HandleGetSentMessageById
    handlers['getSentMessageByID'] = HandleGetSentMessageById
    handlers['getSentMessagesByAddress'] = HandleGetSentMessagesByAddress
    handlers['getSentMessagesBySender'] = HandleGetSentMessagesByAddress
    handlers['getSentMessageByAckData'] = HandleGetSentMessagesByAckData
    handlers['trashMessage'] = HandleTrashMessage
    handlers['trashInboxMessage'] = HandleTrashInboxMessage
    handlers['trashSentMessage'] = HandleTrashSentMessage
    handlers['trashSentMessageByAckData'] = HandleTrashSentMessageByAckDAta
    handlers['sendMessage'] = HandleSendMessage
    handlers['sendBroadcast'] = HandleSendBroadcast
    handlers['getStatus'] = HandleGetStatus
    handlers['addSubscription'] = HandleAddSubscription
    handlers['deleteSubscription'] = HandleDeleteSubscription
    handlers['listSubscriptions'] = ListSubscriptions
    handlers['disseminatePreEncryptedMsg'] = HandleDisseminatePreEncryptedMsg
    handlers['disseminatePubkey'] = HandleDissimatePubKey
    handlers['getMessageDataByDestinationHash'] = \
        HandleGetMessageDataByDestinationHash
    handlers['getMessageDataByDestinationTag'] = \
        HandleGetMessageDataByDestinationHash
    handlers['clientStatus'] = HandleClientStatus
    handlers['decodeAddress'] = HandleDecodeAddress
    handlers['deleteAndVacuum'] = HandleDeleteAndVacuum
    handlers['shutdown'] = HandleShutdown

    def _handle_request(self, method, params):
        if method not in self.handlers:
            raise APIError(20, 'Invalid method: %s' % method)
        result = self.handlers[method](self, params)
        state.last_api_response = datetime.now()
        return result

    def _dispatch(self, method, params):
        self.cookies = []

        validuser = self.APIAuthenticateClient()
        if not validuser:
            time.sleep(2)
            return "RPC Username or password incorrect or HTTP header lacks authentication at all."

        try:
            return self._handle_request(method, params)
        except APIError as e:
            return str(e)
        except varintDecodeError as e:
            logger.error(e)
            return "API Error 0026: Data contains a malformed varint. Some details: %s" % e
        except Exception as e:
            logger.exception(e)

            return "API Error 0021: Unexpected API Failure - %s" % e