PyBitmessage/src/class_singleWorker.py

from __future__ import division

import time
import threading
import hashlib
from struct import pack
# used when the API must execute an outside program
from subprocess import call
from binascii import hexlify, unhexlify

import tr
import l10n
import protocol
import queues
import state
import shared
import defaults
import highlevelcrypto
import proofofwork
import helper_inbox
import helper_random
import helper_msgcoding
from bmconfigparser import BMConfigParser
from debug import logger
from inventory import Inventory
from addresses import (
    decodeAddress, encodeVarint, decodeVarint, calculateInventoryHash
)
# from helper_generic import addDataPadding
from helper_threading import StoppableThread
from helper_sql import sqlQuery, sqlExecute


# This thread, of which there is only one, does the heavy lifting:
# calculating POWs.


def sizeof_fmt(num, suffix='h/s'):
    for unit in ['', 'k', 'M', 'G', 'T', 'P', 'E', 'Z']:
        if abs(num) < 1000.0:
            return "%3.1f%s%s" % (num, unit, suffix)
        num /= 1024.0
    return "%.1f%s%s" % (num, 'Yi', suffix)


class singleWorker(threading.Thread, StoppableThread):

    def __init__(self):
        # QThread.__init__(self, parent)
        threading.Thread.__init__(self, name="singleWorker")
        self.initStop()
        proofofwork.init()

    def stopThread(self):
        try:
            queues.workerQueue.put(("stopThread", "data"))
        except:
            pass
        super(singleWorker, self).stopThread()

    def run(self):

        while not state.sqlReady and state.shutdown == 0:
            self.stop.wait(2)
        if state.shutdown > 0:
            return

        # Initialize the neededPubkeys dictionary.
        queryreturn = sqlQuery(
            '''SELECT DISTINCT toaddress FROM sent'''
            ''' WHERE (status='awaitingpubkey' AND folder='sent')''')
        for row in queryreturn:
            toAddress, = row
            toStatus, toAddressVersionNumber, toStreamNumber, toRipe = \
                decodeAddress(toAddress)
            if toAddressVersionNumber <= 3:
                state.neededPubkeys[toAddress] = 0
            elif toAddressVersionNumber >= 4:
                doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(
                    encodeVarint(toAddressVersionNumber) +
                    encodeVarint(toStreamNumber) + toRipe
                ).digest()).digest()
                # Note that this is the first half of the sha512 hash.
                privEncryptionKey = doubleHashOfAddressData[:32]
                tag = doubleHashOfAddressData[32:]
                # We'll need this for when we receive a pubkey reply:
                # it will be encrypted and we'll need to decrypt it.
                state.neededPubkeys[tag] = (
                    toAddress,
                    highlevelcrypto.makeCryptor(
                        hexlify(privEncryptionKey))
                )

        # Initialize the shared.ackdataForWhichImWatching data structure
        queryreturn = sqlQuery(
            '''SELECT ackdata FROM sent WHERE status = 'msgsent' ''')
        for row in queryreturn:
            ackdata, = row
            logger.info('Watching for ackdata ' + hexlify(ackdata))
            shared.ackdataForWhichImWatching[ackdata] = 0

        # Fix legacy (headerless) watched ackdata to include header
        for oldack in shared.ackdataForWhichImWatching.keys():
            if (len(oldack) == 32):
                # attach legacy header, always constant (msg/1/1)
                newack = '\x00\x00\x00\x02\x01\x01' + oldack
                shared.ackdataForWhichImWatching[newack] = 0
                sqlExecute(
                    'UPDATE sent SET ackdata=? WHERE ackdata=?',
                    newack, oldack
                )
                del shared.ackdataForWhichImWatching[oldack]

        # give some time for the GUI to start
        # before we start on existing POW tasks.
        self.stop.wait(10)

        if state.shutdown == 0:
            # just in case there are any pending tasks for msg
            # messages that have yet to be sent.
            queues.workerQueue.put(('sendmessage', ''))
            # just in case there are any tasks for Broadcasts
            # that have yet to be sent.
            queues.workerQueue.put(('sendbroadcast', ''))

        while state.shutdown == 0:
            self.busy = 0
            command, data = queues.workerQueue.get()
            self.busy = 1
            if command == 'sendmessage':
                try:
                    self.sendMsg()
                except:
                    pass
            elif command == 'sendbroadcast':
                try:
                    self.sendBroadcast()
                except:
                    pass
            elif command == 'doPOWForMyV2Pubkey':
                try:
                    self.doPOWForMyV2Pubkey(data)
                except:
                    pass
            elif command == 'sendOutOrStoreMyV3Pubkey':
                try:
                    self.sendOutOrStoreMyV3Pubkey(data)
                except:
                    pass
            elif command == 'sendOutOrStoreMyV4Pubkey':
                try:
                    self.sendOutOrStoreMyV4Pubkey(data)
                except:
                    pass
            elif command == 'resetPoW':
                try:
                    proofofwork.resetPoW()
                except:
                    pass
            elif command == 'stopThread':
                self.busy = 0
                return
            else:
                logger.error(
                    'Probable programming error: The command sent'
                    ' to the workerThread is weird. It is: %s\n',
                    command
                )

            queues.workerQueue.task_done()
        logger.info("Quitting...")

    # This function also broadcasts out the pubkey message
    # once it is done with the POW
    def doPOWForMyV2Pubkey(self, hash):
        # Look up my stream number based on my address hash
        """configSections = shared.config.addresses()
        for addressInKeysFile in configSections:
            if addressInKeysFile != 'bitmessagesettings':
                status, addressVersionNumber, streamNumber, \
                    hashFromThisParticularAddress = \
                    decodeAddress(addressInKeysFile)
                if hash == hashFromThisParticularAddress:
                    myAddress = addressInKeysFile
                    break"""
        myAddress = shared.myAddressesByHash[hash]
        status, addressVersionNumber, streamNumber, hash = decodeAddress(
            myAddress)

        # 28 days from now plus or minus five minutes
        TTL = int(28 * 24 * 60 * 60 + helper_random.randomrandrange(-300, 300))
        embeddedTime = int(time.time() + TTL)
        payload = pack('>Q', (embeddedTime))
        payload += '\x00\x00\x00\x01'  # object type: pubkey
        payload += encodeVarint(addressVersionNumber)  # Address version number
        payload += encodeVarint(streamNumber)
        # bitfield of features supported by me (see the wiki).
        payload += protocol.getBitfield(myAddress)

        try:
            privSigningKeyBase58 = BMConfigParser().get(
                myAddress, 'privsigningkey')
            privEncryptionKeyBase58 = BMConfigParser().get(
                myAddress, 'privencryptionkey')
        except Exception as err:
            logger.error(
                'Error within doPOWForMyV2Pubkey. Could not read'
                ' the keys from the keys.dat file for a requested'
                ' address. %s\n' % err
            )
            return

        privSigningKeyHex = hexlify(shared.decodeWalletImportFormat(
            privSigningKeyBase58))
        privEncryptionKeyHex = hexlify(shared.decodeWalletImportFormat(
            privEncryptionKeyBase58))
        pubSigningKey = unhexlify(highlevelcrypto.privToPub(
            privSigningKeyHex))
        pubEncryptionKey = unhexlify(highlevelcrypto.privToPub(
            privEncryptionKeyHex))

        payload += pubSigningKey[1:]
        payload += pubEncryptionKey[1:]

        # Do the POW for this pubkey message
        target = 2 ** 64 / (
            defaults.networkDefaultProofOfWorkNonceTrialsPerByte * (
                len(payload) + 8 +
                defaults.networkDefaultPayloadLengthExtraBytes + ((
                    TTL * (
                        len(payload) + 8 +
                        defaults.networkDefaultPayloadLengthExtraBytes
                    )) / (2 ** 16))
            ))
        logger.info('(For pubkey message) Doing proof of work...')
        initialHash = hashlib.sha512(payload).digest()
        trialValue, nonce = proofofwork.run(target, initialHash)
        logger.info(
            '(For pubkey message) Found proof of work %s Nonce: %s',
            trialValue, nonce
        )
        payload = pack('>Q', nonce) + payload

        inventoryHash = calculateInventoryHash(payload)
        objectType = 1
        Inventory()[inventoryHash] = (
            objectType, streamNumber, payload, embeddedTime, '')

        logger.info('broadcasting inv with hash: %s', hexlify(inventoryHash))

        queues.invQueue.put((streamNumber, inventoryHash))
        queues.UISignalQueue.put(('updateStatusBar', ''))
        try:
            BMConfigParser().set(
                myAddress, 'lastpubkeysendtime', str(int(time.time())))
            BMConfigParser().save()
        except:
            # The user deleted the address out of the keys.dat file
            # before this finished.
            pass

    # If this isn't a chan address, this function assembles the pubkey data,
    # does the necessary POW and sends it out. If it *is* a chan then it
    # assembles the pubkey and stores is in the pubkey table so that we can
    # send messages to "ourselves".
    def sendOutOrStoreMyV3Pubkey(self, hash):
        try:
            myAddress = shared.myAddressesByHash[hash]
        except:
            # The address has been deleted.
            return
        if BMConfigParser().safeGetBoolean(myAddress, 'chan'):
            logger.info('This is a chan address. Not sending pubkey.')
            return
        status, addressVersionNumber, streamNumber, hash = decodeAddress(
            myAddress)

        # 28 days from now plus or minus five minutes
        TTL = int(28 * 24 * 60 * 60 + helper_random.randomrandrange(-300, 300))
        embeddedTime = int(time.time() + TTL)
        # signedTimeForProtocolV2 = embeddedTime - TTL
        """
        According to the protocol specification, the expiresTime
        along with the pubkey information is signed. But to be
        backwards compatible during the upgrade period, we shall sign
        not the expiresTime but rather the current time. There must be
        precisely a 28 day difference between the two. After the upgrade
        period we'll switch to signing the whole payload with the
        expiresTime time.
        """
        payload = pack('>Q', (embeddedTime))
        payload += '\x00\x00\x00\x01'  # object type: pubkey
        payload += encodeVarint(addressVersionNumber)  # Address version number
        payload += encodeVarint(streamNumber)
        # bitfield of features supported by me (see the wiki).
        payload += protocol.getBitfield(myAddress)

        try:
            privSigningKeyBase58 = BMConfigParser().get(
                myAddress, 'privsigningkey')
            privEncryptionKeyBase58 = BMConfigParser().get(
                myAddress, 'privencryptionkey')
        except Exception as err:
            logger.error(
                'Error within sendOutOrStoreMyV3Pubkey. Could not read'
                ' the keys from the keys.dat file for a requested'
                ' address. %s\n' % err
            )
            return

        privSigningKeyHex = hexlify(shared.decodeWalletImportFormat(
            privSigningKeyBase58))
        privEncryptionKeyHex = hexlify(shared.decodeWalletImportFormat(
            privEncryptionKeyBase58))
        pubSigningKey = unhexlify(highlevelcrypto.privToPub(
            privSigningKeyHex))
        pubEncryptionKey = unhexlify(highlevelcrypto.privToPub(
            privEncryptionKeyHex))

        payload += pubSigningKey[1:]
        payload += pubEncryptionKey[1:]

        payload += encodeVarint(BMConfigParser().getint(
            myAddress, 'noncetrialsperbyte'))
        payload += encodeVarint(BMConfigParser().getint(
            myAddress, 'payloadlengthextrabytes'))

        signature = highlevelcrypto.sign(payload, privSigningKeyHex)
        payload += encodeVarint(len(signature))
        payload += signature

        # Do the POW for this pubkey message
        target = 2 ** 64 / (
            defaults.networkDefaultProofOfWorkNonceTrialsPerByte * (
                len(payload) + 8 +
                defaults.networkDefaultPayloadLengthExtraBytes + ((
                    TTL * (
                        len(payload) + 8 +
                        defaults.networkDefaultPayloadLengthExtraBytes
                    )) / (2 ** 16))
            ))
        logger.info('(For pubkey message) Doing proof of work...')
        initialHash = hashlib.sha512(payload).digest()
        trialValue, nonce = proofofwork.run(target, initialHash)
        logger.info(
            '(For pubkey message) Found proof of work. Nonce: %s',
            str(nonce)
        )

        payload = pack('>Q', nonce) + payload
        inventoryHash = calculateInventoryHash(payload)
        objectType = 1
        Inventory()[inventoryHash] = (
            objectType, streamNumber, payload, embeddedTime, '')

        logger.info('broadcasting inv with hash: ' + hexlify(inventoryHash))

        queues.invQueue.put((streamNumber, inventoryHash))
        queues.UISignalQueue.put(('updateStatusBar', ''))
        try:
            BMConfigParser().set(
                myAddress, 'lastpubkeysendtime', str(int(time.time())))
            BMConfigParser().save()
        except:
            # The user deleted the address out of the keys.dat file before this
            # finished.
            pass

    # If this isn't a chan address, this function assembles
    # the pubkey data, does the necessary POW and sends it out.
    def sendOutOrStoreMyV4Pubkey(self, myAddress):
        if not BMConfigParser().has_section(myAddress):
            # The address has been deleted.
            return
        if shared.BMConfigParser().safeGetBoolean(myAddress, 'chan'):
            logger.info('This is a chan address. Not sending pubkey.')
            return
        status, addressVersionNumber, streamNumber, hash = decodeAddress(
            myAddress)

        # 28 days from now plus or minus five minutes
        TTL = int(28 * 24 * 60 * 60 + helper_random.randomrandrange(-300, 300))
        embeddedTime = int(time.time() + TTL)
        payload = pack('>Q', (embeddedTime))
        payload += '\x00\x00\x00\x01'  # object type: pubkey
        payload += encodeVarint(addressVersionNumber)  # Address version number
        payload += encodeVarint(streamNumber)
        dataToEncrypt = protocol.getBitfield(myAddress)

        try:
            privSigningKeyBase58 = BMConfigParser().get(
                myAddress, 'privsigningkey')
            privEncryptionKeyBase58 = BMConfigParser().get(
                myAddress, 'privencryptionkey')
        except Exception as err:
            logger.error(
                'Error within sendOutOrStoreMyV4Pubkey. Could not read'
                ' the keys from the keys.dat file for a requested'
                ' address. %s\n' % err
            )
            return

        privSigningKeyHex = hexlify(shared.decodeWalletImportFormat(
            privSigningKeyBase58))
        privEncryptionKeyHex = hexlify(shared.decodeWalletImportFormat(
            privEncryptionKeyBase58))
        pubSigningKey = unhexlify(highlevelcrypto.privToPub(
            privSigningKeyHex))
        pubEncryptionKey = unhexlify(highlevelcrypto.privToPub(
            privEncryptionKeyHex))
        dataToEncrypt += pubSigningKey[1:]
        dataToEncrypt += pubEncryptionKey[1:]

        dataToEncrypt += encodeVarint(BMConfigParser().getint(
            myAddress, 'noncetrialsperbyte'))
        dataToEncrypt += encodeVarint(BMConfigParser().getint(
            myAddress, 'payloadlengthextrabytes'))

        # When we encrypt, we'll use a hash of the data
        # contained in an address as a decryption key. This way
        # in order to read the public keys in a pubkey message,
        # a node must know the address first. We'll also tag,
        # unencrypted, the pubkey with part of the hash so that nodes
        # know which pubkey object to try to decrypt
        # when they want to send a message.
        doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(
            encodeVarint(addressVersionNumber) +
            encodeVarint(streamNumber) + hash
        ).digest()).digest()
        payload += doubleHashOfAddressData[32:]  # the tag
        signature = highlevelcrypto.sign(
            payload + dataToEncrypt, privSigningKeyHex
        )
        dataToEncrypt += encodeVarint(len(signature))
        dataToEncrypt += signature

        privEncryptionKey = doubleHashOfAddressData[:32]
        pubEncryptionKey = highlevelcrypto.pointMult(privEncryptionKey)
        payload += highlevelcrypto.encrypt(
            dataToEncrypt, hexlify(pubEncryptionKey))

        # Do the POW for this pubkey message
        target = 2 ** 64 / (
            defaults.networkDefaultProofOfWorkNonceTrialsPerByte * (
                len(payload) + 8 +
                defaults.networkDefaultPayloadLengthExtraBytes + ((
                    TTL * (
                        len(payload) + 8 +
                        defaults.networkDefaultPayloadLengthExtraBytes
                    )) / (2 ** 16))
            ))
        logger.info('(For pubkey message) Doing proof of work...')
        initialHash = hashlib.sha512(payload).digest()
        trialValue, nonce = proofofwork.run(target, initialHash)
        logger.info(
            '(For pubkey message) Found proof of work %s Nonce: %s',
            trialValue, nonce
        )

        payload = pack('>Q', nonce) + payload
        inventoryHash = calculateInventoryHash(payload)
        objectType = 1
        Inventory()[inventoryHash] = (
            objectType, streamNumber, payload, embeddedTime,
            doubleHashOfAddressData[32:]
        )

        logger.info('broadcasting inv with hash: ' + hexlify(inventoryHash))

        queues.invQueue.put((streamNumber, inventoryHash))
        queues.UISignalQueue.put(('updateStatusBar', ''))
        try:
            BMConfigParser().set(
                myAddress, 'lastpubkeysendtime', str(int(time.time())))
            BMConfigParser().save()
        except Exception as err:
            logger.error(
                'Error: Couldn\'t add the lastpubkeysendtime'
                ' to the keys.dat file. Error message: %s' % err
            )

    def sendBroadcast(self):
        # Reset just in case
        sqlExecute(
            '''UPDATE sent SET status='broadcastqueued' '''
            '''WHERE status = 'doingbroadcastpow' ''')
        queryreturn = sqlQuery(
            '''SELECT fromaddress, subject, message, '''
            ''' ackdata, ttl, encodingtype FROM sent '''
            ''' WHERE status=? and folder='sent' ''', 'broadcastqueued')

        for row in queryreturn:
            fromaddress, subject, body, ackdata, TTL, encoding = row
            status, addressVersionNumber, streamNumber, ripe = \
                decodeAddress(fromaddress)
            if addressVersionNumber <= 1:
                logger.error(
                    'Error: In the singleWorker thread, the '
                    ' sendBroadcast function doesn\'t understand'
                    ' the address version.\n')
                return
            # We need to convert our private keys to public keys in order
            # to include them.
            try:
                privSigningKeyBase58 = BMConfigParser().get(
                    fromaddress, 'privsigningkey')
                privEncryptionKeyBase58 = BMConfigParser().get(
                    fromaddress, 'privencryptionkey')
            except:
                queues.UISignalQueue.put((
                    'updateSentItemStatusByAckdata', (
                        ackdata,
                        tr._translate(
                            "MainWindow",
                            "Error! Could not find sender address"
                            " (your address) in the keys.dat file."))
                ))
                continue

            sqlExecute(
                '''UPDATE sent SET status='doingbroadcastpow' '''
                ''' WHERE ackdata=? AND status='broadcastqueued' ''',
                ackdata)

            privSigningKeyHex = hexlify(shared.decodeWalletImportFormat(
                privSigningKeyBase58))
            privEncryptionKeyHex = hexlify(shared.decodeWalletImportFormat(
                privEncryptionKeyBase58))

            # At this time these pubkeys are 65 bytes long
            # because they include the encoding byte which we won't
            # be sending in the broadcast message.
            pubSigningKey = \
                highlevelcrypto.privToPub(privSigningKeyHex).decode('hex')
            pubEncryptionKey = unhexlify(highlevelcrypto.privToPub(
                privEncryptionKeyHex))

            if TTL > 28 * 24 * 60 * 60:
                TTL = 28 * 24 * 60 * 60
            if TTL < 60 * 60:
                TTL = 60 * 60
            # add some randomness to the TTL
            TTL = int(TTL + helper_random.randomrandrange(-300, 300))
            embeddedTime = int(time.time() + TTL)
            payload = pack('>Q', embeddedTime)
            payload += '\x00\x00\x00\x03'  # object type: broadcast

            if addressVersionNumber <= 3:
                payload += encodeVarint(4)  # broadcast version
            else:
                payload += encodeVarint(5)  # broadcast version

            payload += encodeVarint(streamNumber)
            if addressVersionNumber >= 4:
                doubleHashOfAddressData = hashlib.sha512(hashlib.sha512(
                    encodeVarint(addressVersionNumber) +
                    encodeVarint(streamNumber) + ripe
                ).digest()).digest()
                tag = doubleHashOfAddressData[32:]
                payload += tag
            else:
                tag = ''

            dataToEncrypt = encodeVarint(addressVersionNumber)
            dataToEncrypt += encodeVarint(streamNumber)
            # behavior bitfield
            dataToEncrypt += protocol.getBitfield(fromaddress)
            dataToEncrypt += pubSigningKey[1:]
            dataToEncrypt += pubEncryptionKey[1:]
            if addressVersionNumber >= 3:
                dataToEncrypt += encodeVarint(BMConfigParser().getint(
                    fromaddress, 'noncetrialsperbyte'))
                dataToEncrypt += encodeVarint(BMConfigParser().getint(
                    fromaddress, 'payloadlengthextrabytes'))
            # message encoding type
            dataToEncrypt += encodeVarint(encoding)
            encodedMessage = helper_msgcoding.MsgEncode(
                {"subject": subject, "body": body}, encoding)
            dataToEncrypt += encodeVarint(encodedMessage.length)
            dataToEncrypt += encodedMessage.data
            dataToSign = payload + dataToEncrypt

            signature = highlevelcrypto.sign(
                dataToSign, privSigningKeyHex)
            dataToEncrypt += encodeVarint(len(signature))
            dataToEncrypt += signature

            # Encrypt the broadcast with the information
            # contained in the broadcaster's address.
            # Anyone who knows the address can generate
            # the private encryption key to decrypt the broadcast.
            # This provides virtually no privacy; its purpose is to keep
            # questionable and illegal content from flowing through the
            # Internet connections and being stored on the disk of 3rd parties.
            if addressVersionNumber <= 3:
                privEncryptionKey = hashlib.sha512(
                    encodeVarint(addressVersionNumber) +
                    encodeVarint(streamNumber) + ripe
                ).digest()[:32]
            else:
                privEncryptionKey = doubleHashOfAddressData[:32]

            pubEncryptionKey = highlevelcrypto.pointMult(privEncryptionKey)
            payload += highlevelcrypto.encrypt(
                dataToEncrypt, hexlify(pubEncryptionKey))

            target = 2 ** 64 / (
                defaults.networkDefaultProofOfWorkNonceTrialsPerByte * (
                    len(payload) + 8 +
                    defaults.networkDefaultPayloadLengthExtraBytes + ((
                        TTL * (
                            len(payload) + 8 +
                            defaults.networkDefaultPayloadLengthExtraBytes
                        )) / (2 ** 16))
                ))
            logger.info('(For broadcast message) Doing proof of work...')
            queues.UISignalQueue.put((
                'updateSentItemStatusByAckdata', (
                    ackdata,
                    tr._translate(
                        "MainWindow",
                        "Doing work necessary to send broadcast..."))
            ))
            initialHash = hashlib.sha512(payload).digest()
            trialValue, nonce = proofofwork.run(target, initialHash)
            logger.info(
                '(For broadcast message) Found proof of work %s Nonce: %s',
                trialValue, nonce
            )