lib/wallet.js - Code Metrics - Inspection of "Observe segwit setting from getWallet and decide c..." - blocktrail/blocktrail-sdk-nodejs - Measure and Improve Code Quality continuously with Scrutinizer

Completed
Push — master ( 7b524c...0d3c7c )

by Ruben de
created 2017-11-06 10:25 UTC
lib/wallet.js F

↳ Parent: Project
Complexity

Total Complexity	269
Complexity/F	2.32
Size

Lines of Code	1669
Function Count	116
Duplication

Duplicated Lines	35
Ratio	2.1 %
Importance

Changes	15
Bugs	3	Features	3
Metric	Value
cc	0
wmc	269
c	15
b	3
f	3
nc	0
mnd	6
bc	260
fnc	116
dl	35
loc	1669
rs	2.4
bpm	2.2413
cpm	2.3189
noi	25
40 Functions

Rating	Name	Duplication	Size	Complexity
B	Wallet.upgradeToV3	0	24	1
A	Wallet.labelAddress	0	5	1
B	Wallet.passwordChange	0	33	1
A	Wallet.unlock	0	54	1
A	Wallet.deleteWebhook	0	12	2
D	Wallet.maxSpendable	0	35	8
C	Wallet.deriveByPath	0	46	9
B	Wallet.getNewAddress	0	25	1
A	Wallet.doDiscovery	0	20	2
A	Wallet.unlockV3	0	63	1
B	Wallet.upgradeKeyIndex	0	29	2
A	Wallet.sortMultiSigKeys	0	7	1
B	Wallet.sendTransaction	0	34	3
A	Wallet.unlockV1	0	13	3
A	Wallet.setupWebhook	0	12	2
A	Wallet.unlockV2	0	64	1
A	Wallet.utxos	0	5	1
A	Wallet.getBlocktrailPublicKey	0	15	2
B	Wallet.deleteWallet	19	29	3
A	Wallet.addresses	0	5	1
B	Wallet.coinSelection	0	23	6
A	Wallet.transactions	0	5	1
A	Wallet.lock	0	10	1
A	Wallet.getInfo	0	12	1
B	Wallet._upgradeV1ToV3	0	33	1
A	Wallet.estimateIncompleteTxFee	0	11	2
B	Wallet._upgradeV2ToV3	0	30	1
D	Wallet.pay	16	83	10
A	Wallet.getBalance	0	15	1
A	Wallet.isSegwit	0	3	1
A	Wallet.getPrimaryPublicKey	0	18	3
B	Wallet.doPasswordChange	0	43	1
A	Wallet.estimateIncompleteTxSize	0	67	1
A	Wallet.estimateFee	0	19	1
B	wallet.js ➔ Wallet	0	73	4
B	Wallet.getWalletScriptByPath	0	39	3
A	Wallet.getAddressByPath	0	3	1
A	Wallet.getRedeemScriptByPath	0	3	1
A	Wallet.estimateVsizeFee	0	11	2
C	Wallet.buildTransaction	0	331	7
How to fix Duplicated Code Complexity

var _ = require('lodash');
var assert = require('assert');
var q = require('q');
var async = require('async');
var bitcoin = require('bitcoinjs-lib');
var bitcoinMessage = require('bitcoinjs-message');
var blocktrail = require('./blocktrail');
var CryptoJS = require('crypto-js');
var Encryption = require('./encryption');
var EncryptionMnemonic = require('./encryption_mnemonic');
var SizeEstimation = require('./size_estimation');
var bip39 = require('bip39');

var SignMode = {
    SIGN: "sign",
    DONT_SIGN: "dont_sign"
};

/**
 *
 * @param sdk                   APIClient       SDK instance used to do requests
 * @param identifier            string          identifier of the wallet
 * @param walletVersion         string
 * @param primaryMnemonic       string          primary mnemonic
 * @param encryptedPrimarySeed
 * @param encryptedSecret
 * @param primaryPublicKeys     string          primary mnemonic
 * @param backupPublicKey       string          BIP32 master pubKey M/
 * @param blocktrailPublicKeys  array           list of blocktrail pubKeys indexed by keyIndex
 * @param keyIndex              int             key index to use
 * @param chain                 int             chain to use
 * @param segwit                int             segwit toggle from server
 * @param testnet               bool            testnet
 * @param checksum              string
 * @param upgradeToKeyIndex     int
 * @param bypassNewAddressCheck bool            flag to indicate if wallet should/shouldn't derive new address locally to verify api
 * @constructor
 * @internal
 */
var Wallet = function(
    sdk,
    identifier,
    walletVersion,
    primaryMnemonic,
    encryptedPrimarySeed,
    encryptedSecret,
    primaryPublicKeys,
    backupPublicKey,
    blocktrailPublicKeys,
    keyIndex,
    chain,
    segwit,
    testnet,
    checksum,
    upgradeToKeyIndex,
    bypassNewAddressCheck
) {
    /* jshint -W071 */
    var self = this;

    self.sdk = sdk;
    self.identifier = identifier;
    self.walletVersion = walletVersion;
    self.locked = true;
    self.bypassNewAddressCheck = !!bypassNewAddressCheck;
    self.bitcoinCash = self.sdk.bitcoinCash;
    assert(segwit === 0 || !self.bitcoinCash);

    self.testnet = testnet;
    if (self.testnet) {
        self.network = bitcoin.networks.testnet;
    } else {
        self.network = bitcoin.networks.bitcoin;
    }

    assert(backupPublicKey instanceof bitcoin.HDNode);
    assert(_.every(primaryPublicKeys, function(primaryPublicKey) { return primaryPublicKey instanceof bitcoin.HDNode; }));
    assert(_.every(blocktrailPublicKeys, function(blocktrailPublicKey) { return blocktrailPublicKey instanceof bitcoin.HDNode; }));

    // v1
    self.primaryMnemonic = primaryMnemonic;

    // v2 & v3
    self.encryptedPrimarySeed = encryptedPrimarySeed;
    self.encryptedSecret = encryptedSecret;

    self.primaryPrivateKey = null;
    self.backupPrivateKey = null;

    self.backupPublicKey = backupPublicKey;
    self.blocktrailPublicKeys = blocktrailPublicKeys;
    self.primaryPublicKeys = primaryPublicKeys;
    self.keyIndex = keyIndex;

    var chainIdx;
    if (!self.bitcoinCash) {
        if (segwit) {
            chainIdx = Wallet.CHAIN_BTC_SEGWIT;
        } else {
            chainIdx = Wallet.CHAIN_BTC_DEFAULT;
        }
    } else {
        chainIdx = Wallet.CHAIN_BCC_DEFAULT;
    }

    self.chain = chainIdx;
    self.checksum = checksum;
    self.upgradeToKeyIndex = upgradeToKeyIndex;

    self.secret = null;
    self.seedHex = null;
};

Wallet.WALLET_VERSION_V1 = 'v1';
Wallet.WALLET_VERSION_V2 = 'v2';
Wallet.WALLET_VERSION_V3 = 'v3';

Wallet.WALLET_ENTROPY_BITS = 256;

Wallet.OP_RETURN = 'opreturn';
Wallet.DATA = Wallet.OP_RETURN; // alias

Wallet.PAY_PROGRESS_START = 0;
Wallet.PAY_PROGRESS_COIN_SELECTION = 10;
Wallet.PAY_PROGRESS_CHANGE_ADDRESS = 20;
Wallet.PAY_PROGRESS_SIGN = 30;
Wallet.PAY_PROGRESS_SEND = 40;
Wallet.PAY_PROGRESS_DONE = 100;

Wallet.CHAIN_BTC_DEFAULT = 0;
Wallet.CHAIN_BTC_SEGWIT = 2;
Wallet.CHAIN_BCC_DEFAULT = 1;

Wallet.FEE_STRATEGY_FORCE_FEE = blocktrail.FEE_STRATEGY_FORCE_FEE;
Wallet.FEE_STRATEGY_BASE_FEE = blocktrail.FEE_STRATEGY_BASE_FEE;
Wallet.FEE_STRATEGY_OPTIMAL = blocktrail.FEE_STRATEGY_OPTIMAL;
Wallet.FEE_STRATEGY_LOW_PRIORITY = blocktrail.FEE_STRATEGY_LOW_PRIORITY;
Wallet.FEE_STRATEGY_MIN_RELAY_FEE = blocktrail.FEE_STRATEGY_MIN_RELAY_FEE;

Wallet.prototype.isSegwit = function() {
    return Wallet.CHAIN_BTC_SEGWIT === this.chain;
};

Wallet.prototype.unlock = function(options, cb) {
    var self = this;

    var deferred = q.defer();
    deferred.promise.nodeify(cb);

    // avoid modifying passed options
    options = _.merge({}, options);

    q.fcall(function() {
        switch (self.walletVersion) {
            case Wallet.WALLET_VERSION_V1:

                return self.unlockV1(options);

            case Wallet.WALLET_VERSION_V2:
                return self.unlockV2(options);

            case Wallet.WALLET_VERSION_V3:
                return self.unlockV3(options);

            default:
                return q.reject(new blocktrail.WalletInitError("Invalid wallet version"));
        }
    }).then(
        function(primaryPrivateKey) {
            self.primaryPrivateKey = primaryPrivateKey;

            // create a checksum of our private key which we'll later use to verify we used the right password
            var checksum = self.primaryPrivateKey.getAddress();

            // check if we've used the right passphrase
            if (checksum !== self.checksum) {
                throw new blocktrail.WalletChecksumError("Generated checksum [" + checksum + "] does not match " +
                    "[" + self.checksum + "], most likely due to incorrect password");
            }

            self.locked = false;

            // if the response suggests we should upgrade to a different blocktrail cosigning key then we should
            if (typeof self.upgradeToKeyIndex !== "undefined" && self.upgradeToKeyIndex !== null) {
function isBig(a) {
    if (a > 5000) {
        return "yes";
    }
}

console.log(isBig(5001)); //returns yes
console.log(isBig(42)); //returns undefined
                return self.upgradeKeyIndex(self.upgradeToKeyIndex);
            }
        }
    ).then(
        function(r) {
            deferred.resolve(r);
        },
        function(e) {
            deferred.reject(e);
        }
    );

    return deferred.promise;
};

Wallet.prototype.unlockV1 = function(options) {
    var self = this;

    options.primaryMnemonic = typeof options.primaryMnemonic !== "undefined" ? options.primaryMnemonic : self.primaryMnemonic;
    options.secretMnemonic = typeof options.secretMnemonic !== "undefined" ? options.secretMnemonic : self.secretMnemonic;

    return self.sdk.resolvePrimaryPrivateKeyFromOptions(options)
        .then(function(options) {
            self.primarySeed = options.primarySeed;

            return options.primaryPrivateKey;
        });
};

Wallet.prototype.unlockV2 = function(options, cb) {
    var self = this;

    var deferred = q.defer();
    deferred.promise.nodeify(cb);

    deferred.resolve(q.fcall(function() {
        /* jshint -W071, -W074 */
        options.encryptedPrimarySeed = typeof options.encryptedPrimarySeed !== "undefined" ? options.encryptedPrimarySeed : self.encryptedPrimarySeed;
        options.encryptedSecret = typeof options.encryptedSecret !== "undefined" ? options.encryptedSecret : self.encryptedSecret;

        if (options.secret) {
            self.secret = options.secret;
        }

        if (options.primaryPrivateKey) {
            throw new blocktrail.WalletDecryptError("specifying primaryPrivateKey has been deprecated");
        }

        if (options.primarySeed) {
            self.primarySeed = options.primarySeed;
        } else if (options.secret) {
            try {
                self.primarySeed = new Buffer(

                    CryptoJS.AES.decrypt(CryptoJS.format.OpenSSL.parse(options.encryptedPrimarySeed), self.secret).toString(CryptoJS.enc.Utf8), 'base64');
                if (!self.primarySeed.length) {
                    throw new Error();
                }
            } catch (e) {
                throw new blocktrail.WalletDecryptError("Failed to decrypt primarySeed");
            }

        } else {
            // avoid conflicting options
            if (options.passphrase && options.password) {
                throw new blocktrail.WalletCreateError("Can't specify passphrase and password");
            }
            // normalize passphrase/password
            options.passphrase = options.passphrase || options.password;

            try {
                self.secret = CryptoJS.AES.decrypt(CryptoJS.format.OpenSSL.parse(options.encryptedSecret), options.passphrase).toString(CryptoJS.enc.Utf8);
                if (!self.secret.length) {
                    throw new Error();
                }
            } catch (e) {
                throw new blocktrail.WalletDecryptError("Failed to decrypt secret");
            }
            try {
                self.primarySeed = new Buffer(
                    CryptoJS.AES.decrypt(CryptoJS.format.OpenSSL.parse(options.encryptedPrimarySeed), self.secret).toString(CryptoJS.enc.Utf8), 'base64');
                if (!self.primarySeed.length) {
                    throw new Error();
                }
            } catch (e) {
                throw new blocktrail.WalletDecryptError("Failed to decrypt primarySeed");
            }
        }

        return bitcoin.HDNode.fromSeedBuffer(self.primarySeed, self.network);
    }));

    return deferred.promise;
};

Wallet.prototype.unlockV3 = function(options, cb) {
    var self = this;

    var deferred = q.defer();
    deferred.promise.nodeify(cb);

    deferred.resolve(q.fcall(function() {
        return q.when()
            .then(function() {
                /* jshint -W071, -W074 */
                options.encryptedPrimarySeed = typeof options.encryptedPrimarySeed !== "undefined" ? options.encryptedPrimarySeed : self.encryptedPrimarySeed;
                options.encryptedSecret = typeof options.encryptedSecret !== "undefined" ? options.encryptedSecret : self.encryptedSecret;

                if (options.secret) {
                    self.secret = options.secret;
                }

                if (options.primaryPrivateKey) {
                    throw new blocktrail.WalletInitError("specifying primaryPrivateKey has been deprecated");
                }

                if (options.primarySeed) {
                    self.primarySeed = options.primarySeed;

                } else if (options.secret) {
                    return self.sdk.promisedDecrypt(new Buffer(options.encryptedPrimarySeed, 'base64'), self.secret)

                        .then(function(primarySeed) {
                            self.primarySeed = primarySeed;
                        }, function() {
                            throw new blocktrail.WalletDecryptError("Failed to decrypt primarySeed");
                        });
                } else {
                    // avoid conflicting options
                    if (options.passphrase && options.password) {
                        throw new blocktrail.WalletCreateError("Can't specify passphrase and password");
                    }
                    // normalize passphrase/password
                    options.passphrase = options.passphrase || options.password;
                    delete options.password;

                    return self.sdk.promisedDecrypt(new Buffer(options.encryptedSecret, 'base64'), new Buffer(options.passphrase))

                        .then(function(secret) {
                            self.secret = secret;
                        }, function() {
                            throw new blocktrail.WalletDecryptError("Failed to decrypt secret");
                        })
                        .then(function() {
                            return self.sdk.promisedDecrypt(new Buffer(options.encryptedPrimarySeed, 'base64'), self.secret)

                                .then(function(primarySeed) {
                                    self.primarySeed = primarySeed;
                                }, function() {
                                    throw new blocktrail.WalletDecryptError("Failed to decrypt primarySeed");
                                });
                        });
                }
            })
            .then(function() {
                return bitcoin.HDNode.fromSeedBuffer(self.primarySeed, self.network);
            })
        ;
    }));

    return deferred.promise;
};

Wallet.prototype.lock = function() {
    var self = this;

    self.secret = null;
    self.primarySeed = null;
    self.primaryPrivateKey = null;
    self.backupPrivateKey = null;

    self.locked = true;
};

/**
 * upgrade wallet to V3 encryption scheme
 *
 * @param passphrase is required again to reencrypt the data, important that it's the correct password!!!
 * @param cb
 * @returns {promise}
 */
Wallet.prototype.upgradeToV3 = function(passphrase, cb) {
    var self = this;

    var deferred = q.defer();
    deferred.promise.nodeify(cb);

    q.when(true)
        .then(function() {
            if (self.locked) {
                throw new blocktrail.WalletLockedError("Wallet needs to be unlocked to upgrade");
            }

            if (self.walletVersion === Wallet.WALLET_VERSION_V3) {
                throw new blocktrail.WalletUpgradeError("Wallet is already V3");
            } else if (self.walletVersion === Wallet.WALLET_VERSION_V2) {
                return self._upgradeV2ToV3(passphrase, deferred.notify.bind(deferred));
            } else if (self.walletVersion === Wallet.WALLET_VERSION_V1) {
function isBig(a) {
    if (a > 5000) {
        return "yes";
    }
}

console.log(isBig(5001)); //returns yes
console.log(isBig(42)); //returns undefined
                return self._upgradeV1ToV3(passphrase, deferred.notify.bind(deferred));
            }
        })
        .then(function(r) { deferred.resolve(r); }, function(e) { deferred.reject(e); });

    return deferred.promise;
};

Wallet.prototype._upgradeV2ToV3 = function(passphrase, notify) {
    var self = this;

    return q.when(true)
        .then(function() {
            var options = {
                storeDataOnServer: true,
                passphrase: passphrase,
                primarySeed: self.primarySeed,
                recoverySecret: false // don't create new recovery secret, V2 already has ones
            };

            return self.sdk.produceEncryptedDataV3(options, notify || function noop() {})
                .then(function(options) {
                    return self.sdk.updateWallet(self.identifier, {
                        encrypted_primary_seed: options.encryptedPrimarySeed.toString('base64'),
                        encrypted_secret: options.encryptedSecret.toString('base64'),
                        wallet_version: Wallet.WALLET_VERSION_V3
                    }).then(function() {
                        self.secret = options.secret;
                        self.encryptedPrimarySeed = options.encryptedPrimarySeed;
                        self.encryptedSecret = options.encryptedSecret;
                        self.walletVersion = Wallet.WALLET_VERSION_V3;

                        return self;
                    });
                });
        });

};

Wallet.prototype._upgradeV1ToV3 = function(passphrase, notify) {
    var self = this;

    return q.when(true)
        .then(function() {
            var options = {
                storeDataOnServer: true,
                passphrase: passphrase,
                primarySeed: self.primarySeed
            };

            return self.sdk.produceEncryptedDataV3(options, notify || function noop() {})
                .then(function(options) {
                    // store recoveryEncryptedSecret for printing on backup sheet
                    self.recoveryEncryptedSecret = options.recoveryEncryptedSecret;

                    return self.sdk.updateWallet(self.identifier, {
                        primary_mnemonic: '',
                        encrypted_primary_seed: options.encryptedPrimarySeed.toString('base64'),
                        encrypted_secret: options.encryptedSecret.toString('base64'),
                        recovery_secret: options.recoverySecret.toString('hex'),
                        wallet_version: Wallet.WALLET_VERSION_V3
                    }).then(function() {
                        self.secret = options.secret;
                        self.encryptedPrimarySeed = options.encryptedPrimarySeed;
                        self.encryptedSecret = options.encryptedSecret;
                        self.walletVersion = Wallet.WALLET_VERSION_V3;

                        return self;
                    });
                });
        });
};

Wallet.prototype.doPasswordChange = function(newPassword) {
    var self = this;

    return q.when(null)
        .then(function() {

            if (self.walletVersion === Wallet.WALLET_VERSION_V1) {
                throw new blocktrail.WalletLockedError("Wallet version does not support password change!");
            }

            if (self.locked) {
                throw new blocktrail.WalletLockedError("Wallet needs to be unlocked to change password");
            }

            if (!self.secret) {
                throw new blocktrail.WalletLockedError("No secret");
            }

            var newEncryptedSecret;
            var newEncrypedWalletSecretMnemonic;
            if (self.walletVersion === Wallet.WALLET_VERSION_V2) {
                newEncryptedSecret = CryptoJS.AES.encrypt(self.secret, newPassword).toString(CryptoJS.format.OpenSSL);
                newEncrypedWalletSecretMnemonic = bip39.entropyToMnemonic(blocktrail.convert(newEncryptedSecret, 'base64', 'hex'));

            } else {
                if (typeof newPassword === "string") {
                    newPassword = new Buffer(newPassword);

                } else {
                    if (!(newPassword instanceof Buffer)) {
                        throw new Error('New password must be provided as a string or a Buffer');
                    }
                }

                newEncryptedSecret = Encryption.encrypt(self.secret, newPassword);
                newEncrypedWalletSecretMnemonic = EncryptionMnemonic.encode(newEncryptedSecret);

                // It's a buffer, so convert it back to base64
                newEncryptedSecret = newEncryptedSecret.toString('base64');
            }

            return [newEncryptedSecret, newEncrypedWalletSecretMnemonic];
        });
};

Wallet.prototype.passwordChange = function(newPassword, cb) {
    var self = this;

    var deferred = q.defer();
    deferred.promise.nodeify(cb);

    q.fcall(function() {
        return self.doPasswordChange(newPassword)
            .then(function(r) {
                var newEncryptedSecret = r[0];
                var newEncrypedWalletSecretMnemonic = r[1];

                return self.sdk.updateWallet(self.identifier, {encrypted_secret: newEncryptedSecret}).then(function() {
                    self.encryptedSecret = newEncryptedSecret;

                    // backupInfo
                    return {
                        encryptedSecret: newEncrypedWalletSecretMnemonic
                    };
                });
            })
            .then(
                function(r) {
                    deferred.resolve(r);
                },
                function(e) {
                    deferred.reject(e);
                }
            );
    });

    return deferred.promise;
};

/**
 * get address for specified path
 *
 * @param path
 * @returns string
 */
Wallet.prototype.getAddressByPath = function(path) {
    return this.getWalletScriptByPath(path).address;
};

/**
 * get redeemscript for specified path
 *
 * @param path
 * @returns {bitcoin.Script}
 */
Wallet.prototype.getRedeemScriptByPath = function(path) {
    return this.getWalletScriptByPath(path).redeemScript;
};

Wallet.prototype.getWalletScriptByPath = function(path) {
    var self = this;

    // get derived primary key
    var derivedPrimaryPublicKey = self.getPrimaryPublicKey(path);
    // get derived blocktrail key
    var derivedBlocktrailPublicKey = self.getBlocktrailPublicKey(path);
    // derive the backup key
    var derivedBackupPublicKey = Wallet.deriveByPath(self.backupPublicKey, path.replace("'", ""), "M");

    // sort the pubkeys
    var pubKeys = Wallet.sortMultiSigKeys([
        derivedPrimaryPublicKey.keyPair.getPublicKeyBuffer(),
        derivedBackupPublicKey.keyPair.getPublicKeyBuffer(),
        derivedBlocktrailPublicKey.keyPair.getPublicKeyBuffer()
    ]);

    var multisig = bitcoin.script.multisig.output.encode(2, pubKeys);
    var scriptType = parseInt(path.split("/")[2]);

    var ws, rs;
    if (this.network !== "bitcoincash" && scriptType === Wallet.CHAIN_BTC_SEGWIT) {
        ws = multisig;
        rs = bitcoin.script.witnessScriptHash.output.encode(bitcoin.crypto.sha256(ws));
    } else {
        ws = null;
        rs = multisig;
    }

    var spk = bitcoin.script.scriptHash.output.encode(bitcoin.crypto.hash160(rs));
    var addr = bitcoin.address.fromOutputScript(spk, this.network);

    return {
        witnessScript: ws,
        redeemScript: rs,
        scriptPubKey: spk,
        address: addr
    };
};

/**
 * get primary public key by path
 *  first level of the path is used as keyIndex to find the correct key in the dict
 *
 * @param path  string
 * @returns {bitcoin.HDNode}
 */
Wallet.prototype.getPrimaryPublicKey = function(path) {
    var self = this;

    path = path.replace("m", "M");

    var keyIndex = path.split("/")[1].replace("'", "");

    if (!self.primaryPublicKeys[keyIndex]) {
        if (self.primaryPrivateKey) {
            self.primaryPublicKeys[keyIndex] = Wallet.deriveByPath(self.primaryPrivateKey, "M/" + keyIndex + "'", "m");
        } else {
            throw new blocktrail.KeyPathError("Wallet.getPrimaryPublicKey keyIndex (" + keyIndex + ") is unknown to us");
        }
    }

    var primaryPublicKey = self.primaryPublicKeys[keyIndex];
    return Wallet.deriveByPath(primaryPublicKey, path, "M/" + keyIndex + "'");
};

/**
 * get blocktrail public key by path
 *  first level of the path is used as keyIndex to find the correct key in the dict
 *
 * @param path  string
 * @returns {bitcoin.HDNode}
 */
Wallet.prototype.getBlocktrailPublicKey = function(path) {
    var self = this;

    path = path.replace("m", "M");

    var keyIndex = path.split("/")[1].replace("'", "");

    if (!self.blocktrailPublicKeys[keyIndex]) {
        throw new blocktrail.KeyPathError("Wallet.getBlocktrailPublicKey keyIndex (" + keyIndex + ") is unknown to us");
    }

    var blocktrailPublicKey = self.blocktrailPublicKeys[keyIndex];

    return Wallet.deriveByPath(blocktrailPublicKey, path, "M/" + keyIndex + "'");
};

/**
 * upgrade wallet to different blocktrail cosign key
 *
 * @param keyIndex  int
 * @param [cb]      function
 * @returns {q.Promise}
 */
Wallet.prototype.upgradeKeyIndex = function(keyIndex, cb) {
    var self = this;

    var deferred = q.defer();
    deferred.promise.nodeify(cb);

    if (self.locked) {
        deferred.reject(new blocktrail.WalletLockedError("Wallet needs to be unlocked to upgrade key index"));
        return deferred.promise;
    }

    var primaryPublicKey = self.primaryPrivateKey.deriveHardened(keyIndex).neutered();

    deferred.resolve(
        self.sdk.upgradeKeyIndex(self.identifier, keyIndex, [primaryPublicKey.toBase58(), "M/" + keyIndex + "'"])
            .then(function(result) {
                self.keyIndex = keyIndex;
                _.forEach(result.blocktrail_public_keys, function(publicKey, keyIndex) {
                    self.blocktrailPublicKeys[keyIndex] = bitcoin.HDNode.fromBase58(publicKey[0], self.network);
                });

                self.primaryPublicKeys[keyIndex] = primaryPublicKey;

                return true;
            })
    );

    return deferred.promise;
};

/**
 * generate a new derived private key and return the new address for it
 *
 * @param [cb]  function        callback(err, address)
 * @returns {q.Promise}
 */
Wallet.prototype.getNewAddress = function(cb) {
    var self = this;
    var deferred = q.defer();
    deferred.promise.spreadNodeify(cb);

    deferred.resolve(
        self.sdk.getNewDerivation(self.identifier, "M/" + self.keyIndex + "'/" + self.chain)
            .then(function(newDerivation) {
                var path = newDerivation.path;
                var address = newDerivation.address;
                if (!self.bypassNewAddressCheck) {

                    address = self.getAddressByPath(newDerivation.path);
                    // debug check
                    if (address !== newDerivation.address) {
                        throw new blocktrail.WalletAddressError("Failed to verify address [" + newDerivation.address + "] !== [" + address + "]");
                    }
                }

                return [address, path];
            })
    );

    return deferred.promise;
};

/**
 * get the balance for the wallet
 *
 * @param [cb]  function        callback(err, confirmed, unconfirmed)
 * @returns {q.Promise}
 */
Wallet.prototype.getBalance = function(cb) {
    var self = this;

    var deferred = q.defer();
    deferred.promise.spreadNodeify(cb);

    deferred.resolve(
        self.sdk.getWalletBalance(self.identifier)
            .then(function(result) {
                return [result.confirmed, result.unconfirmed];
            })
    );

    return deferred.promise;
};

/**
 * get the balance for the wallet
 *
 * @param [cb]  function        callback(err, confirmed, unconfirmed)
 * @returns {q.Promise}
 */
Wallet.prototype.getInfo = function(cb) {
    var self = this;

    var deferred = q.defer();
    deferred.promise.spreadNodeify(cb);

    deferred.resolve(
        self.sdk.getWalletBalance(self.identifier)
    );

    return deferred.promise;
};

/**
 * do wallet discovery (slow)
 *
 * @param [gap] int             gap limit
 * @param [cb]  function        callback(err, confirmed, unconfirmed)
 * @returns {q.Promise}
 */
Wallet.prototype.doDiscovery = function(gap, cb) {
    var self = this;

    if (typeof gap === "function") {
        cb = gap;
        gap = null;
    }

    var deferred = q.defer();
    deferred.promise.spreadNodeify(cb);

    deferred.resolve(
        self.sdk.doWalletDiscovery(self.identifier, gap)
            .then(function(result) {
                return [result.confirmed, result.unconfirmed];
            })
    );

    return deferred.promise;
};

/**
 *
 * @param [force]   bool            ignore warnings (such as non-zero balance)
 * @param [cb]      function        callback(err, success)
 * @returns {q.Promise}
 */
Wallet.prototype.deleteWallet = function(force, cb) {
    var self = this;

    if (typeof force === "function") {
        cb = force;
        force = false;
    }

    var deferred = q.defer();

    deferred.promise.nodeify(cb);

    if (self.locked) {
        deferred.reject(new blocktrail.WalletDeleteError("Wallet needs to be unlocked to delete wallet"));
        return deferred.promise;
    }

    var checksum = self.primaryPrivateKey.getAddress();
    var privBuf = self.primaryPrivateKey.keyPair.d.toBuffer(32);
    var signature = bitcoinMessage.sign(checksum, self.network.messagePrefix, privBuf, true).toString('base64');

    deferred.resolve(
        self.sdk.deleteWallet(self.identifier, checksum, signature, force)
            .then(function(result) {
                return result.deleted;
            })
    );

    return deferred.promise;
};

/**
 * create, sign and send a transaction
 *
 * @param pay                   array       {'address': (int)value}     coins to send
 * @param [changeAddress]       bool        change address to use (auto generated if NULL)
 * @param [allowZeroConf]       bool        allow zero confirmation unspent outputs to be used in coin selection
 * @param [randomizeChangeIdx]  bool        randomize the index of the change output (default TRUE, only disable if you have a good reason to)
 * @param [feeStrategy]         string      defaults to Wallet.FEE_STRATEGY_OPTIMAL
 * @param [twoFactorToken]      string      2FA token
 * @param options
 * @param [cb]                  function    callback(err, txHash)
 * @returns {q.Promise}
 */
Wallet.prototype.pay = function(pay, changeAddress, allowZeroConf, randomizeChangeIdx, feeStrategy, twoFactorToken, options, cb) {

    /* jshint -W071 */
    var self = this;

    if (typeof changeAddress === "function") {
        cb = changeAddress;
        changeAddress = null;
    } else if (typeof allowZeroConf === "function") {
        cb = allowZeroConf;
        allowZeroConf = false;
    } else if (typeof randomizeChangeIdx === "function") {
        cb = randomizeChangeIdx;
        randomizeChangeIdx = true;
    } else if (typeof feeStrategy === "function") {
        cb = feeStrategy;
        feeStrategy = null;
    } else if (typeof twoFactorToken === "function") {
        cb = twoFactorToken;
        twoFactorToken = null;
    } else if (typeof options === "function") {
        cb = options;
        options = {};
    }

    randomizeChangeIdx = typeof randomizeChangeIdx !== "undefined" ? randomizeChangeIdx : true;
    feeStrategy = feeStrategy || Wallet.FEE_STRATEGY_OPTIMAL;
    options = options || {};
    var checkFee = typeof options.checkFee !== "undefined" ? options.checkFee : true;

    var deferred = q.defer();
    deferred.promise.nodeify(cb);

    if (self.locked) {
        deferred.reject(new blocktrail.WalletLockedError("Wallet needs to be unlocked to send coins"));
        return deferred.promise;
    }

    q.nextTick(function() {
        deferred.notify(Wallet.PAY_PROGRESS_START);

        self.buildTransaction(pay, changeAddress, allowZeroConf, randomizeChangeIdx, feeStrategy, options)
            .then(
            function(r) { return r; },

            function(e) { deferred.reject(e); },
            function(progress) {
                deferred.notify(progress);
            }
        )
            .spread(
            function(tx, utxos) {

                deferred.notify(Wallet.PAY_PROGRESS_SEND);

                var data = {
                    signed_transaction: tx.toHex(),
                    base_transaction: tx.__toBuffer(null, null, false).toString('hex')
                };

                return self.sendTransaction(data, utxos.map(function(utxo) { return utxo['path']; }), checkFee, twoFactorToken, options.prioboost)
                    .then(function(result) {
                        deferred.notify(Wallet.PAY_PROGRESS_DONE);

                        if (!result || !result['complete'] || result['complete'] === 'false') {
                            deferred.reject(new blocktrail.TransactionSignError("Failed to completely sign transaction"));

                        } else {
                            return result['txid'];
                        }
                    });
            },
            function(e) {
                throw e;
            }
        )
            .then(
            function(r) { deferred.resolve(r); },
            function(e) { deferred.reject(e); }
        )
        ;
    });

    return deferred.promise;
};

Wallet.prototype.buildTransaction = function(pay, changeAddress, allowZeroConf, randomizeChangeIdx, feeStrategy, options, cb) {
    /* jshint -W071 */
    var self = this;

    if (typeof changeAddress === "function") {
        cb = changeAddress;
        changeAddress = null;
    } else if (typeof allowZeroConf === "function") {
        cb = allowZeroConf;
        allowZeroConf = false;
    } else if (typeof randomizeChangeIdx === "function") {
        cb = randomizeChangeIdx;
        randomizeChangeIdx = true;
    } else if (typeof feeStrategy === "function") {
        cb = feeStrategy;
        feeStrategy = null;
    } else if (typeof options === "function") {
        cb = options;
        options = {};
    }

    randomizeChangeIdx = typeof randomizeChangeIdx !== "undefined" ? randomizeChangeIdx : true;
    feeStrategy = feeStrategy || Wallet.FEE_STRATEGY_OPTIMAL;
    options = options || {};

    var deferred = q.defer();
    deferred.promise.spreadNodeify(cb);

    q.nextTick(function() {
        var send = [];

        // normalize / validate sends
        Object.keys(pay).forEach(function(address) {
            address = address.trim();
            var value = pay[address];
            var err = null;


            if (address === Wallet.OP_RETURN) {
                var datachunk = Buffer.isBuffer(value) ? value : new Buffer(value, 'utf-8');

                send.push({scriptPubKey: bitcoin.script.nullData.output.encode(datachunk).toString('hex'), value: 0});
                return;
            }

            var addr;
            var type;

            try {
                addr = bitcoin.address.fromBech32(address, self.network);
                err = null;
                type = "bech32";
            } catch (_err) {
                err = _err;
            }

            if (!addr) {
                try {
                    addr = bitcoin.address.fromBase58Check(address, self.network);
                    err = null;
                    type = "base58";
                } catch (_err) {
                    err = _err;
                }
            }

            if (!addr || err) {
                err = new blocktrail.InvalidAddressError("Invalid address [" + address + "]" + (err ? " (" + err.message + ")" : ""));
            } else if (parseInt(value, 10).toString() !== value.toString()) {
                err = new blocktrail.WalletSendError("Values should be in Satoshis");
            } else if (!(value = parseInt(value, 10))) {
                err = new blocktrail.WalletSendError("Values should be non zero");
            } else if (value <= blocktrail.DUST) {
                err = new blocktrail.WalletSendError("Values should be more than dust (" + blocktrail.DUST + ")");
            }

            if (err) {
                deferred.reject(err);
                return deferred.promise;
            }

            var payload = {
                value: parseInt(value, 10)
            };
            if (type === "bech32") {

                payload.scriptPubKey = bitcoin.address.toOutputScript(address, self.network).toString('hex');
            } else {
                payload.address = address;
            }
            send.push(payload);

        });

        if (!send.length) {
            deferred.reject(new blocktrail.WalletSendError("Need at least one recipient"));
            return deferred.promise;
        }

        deferred.notify(Wallet.PAY_PROGRESS_COIN_SELECTION);

        deferred.resolve(
            self.coinSelection(send, true, allowZeroConf, feeStrategy, options)
            /**
             *
             * @param {Object[]} utxos
             * @param fee
             * @param change
             * @param randomizeChangeIdx

             * @returns {*}
             */
                .spread(function(utxos, fee, change) {
                    var tx, txb, outputs = [];

                    var deferred = q.defer();

                    async.waterfall([
                        /**
                         * prepare
                         *
                         * @param cb
                         */
                        function(cb) {
                            var inputsTotal = utxos.map(function(utxo) {
                                return utxo['value'];
                            }).reduce(function(a, b) {
                                return a + b;
                            });
                            var outputsTotal = Object.keys(send).map(function(address) {
                                return send[address];
                            }).reduce(function(a, b) {
                                return a + b;
                            });
                            var estimatedChange = inputsTotal - outputsTotal - fee;

                            if (estimatedChange > blocktrail.DUST * 2 && estimatedChange !== change) {
                                return cb(new blocktrail.WalletFeeError("the amount of change (" + change + ") " +
                                    "suggested by the coin selection seems incorrect (" + estimatedChange + ")"));
                            }

                            cb();

                        },
                        /**
                         * init transaction builder
                         *
                         * @param cb
                         */
                        function(cb) {
                            txb = new bitcoin.TransactionBuilder(self.network);
                            if (self.bitcoinCash) {
                                txb.enableBitcoinCash();
                            }

                            cb();
                        },
                        /**
                         * add UTXOs as inputs
                         *
                         * @param cb
                         */
                        function(cb) {
                            var i;

                            for (i = 0; i < utxos.length; i++) {
                                txb.addInput(utxos[i]['hash'], utxos[i]['idx']);
                            }

                            cb();
                        },
                        /**
                         * build desired outputs
                         *
                         * @param cb
                         */
                        function(cb) {
                            send.forEach(function(_send) {
                                if (_send.address) {
                                    outputs.push({address: _send.address, value: _send.value});
                                } else if (_send.scriptPubKey) {
                                    outputs.push({scriptPubKey: new Buffer(_send.scriptPubKey, 'hex'), value: _send.value});

                                } else {
                                    throw new Error("Invalid send");
                                }
                            });
                            cb();
                        },
                        /**
                         * get change address if required
                         *
                         * @param cb
                         */
                        function(cb) {
                            if (change > 0) {
                                if (change <= blocktrail.DUST) {
                                    change = 0; // don't do a change output if it would be a dust output

                                } else {
                                    if (!changeAddress) {
                                        deferred.notify(Wallet.PAY_PROGRESS_CHANGE_ADDRESS);

                                        return self.getNewAddress(function(err, address) {
                                            if (err) {
                                                return cb(err);
                                            }
                                            changeAddress = address;
                                            cb();

                                        });
                                    }
                                }
                            }

                            cb();

                        },
                        /**
                         * add change to outputs
                         *
                         * @param cb
                         */
                        function(cb) {
                            if (change > 0) {
                                if (randomizeChangeIdx) {
                                    outputs.splice(_.random(0, outputs.length), 0, {
                                        address: changeAddress,
                                        value: change
                                    });
                                } else {
                                    outputs.push({address: changeAddress, value: change});
                                }
                            }

                            cb();
                        },
                        /**
                         * add outputs to txb
                         *
                         * @param cb
                         */
                        function(cb) {
                            outputs.forEach(function(outputInfo) {
                                txb.addOutput(outputInfo.scriptPubKey || outputInfo.address, outputInfo.value);
                            });

                            cb();
                        },
                        /**
                         * sign
                         *
                         * @param cb
                         */
                        function(cb) {
                            var i, privKey, path, redeemScript, witnessScript;

                            deferred.notify(Wallet.PAY_PROGRESS_SIGN);

                            for (i = 0; i < utxos.length; i++) {
                                var mode = SignMode.SIGN;
                                if (utxos[i].sign_mode) {
                                    mode = utxos[i].sign_mode;
                                }

                                redeemScript = null;

                                witnessScript = null;
                                if (mode === SignMode.SIGN) {
                                    path = utxos[i]['path'].replace("M", "m");

                                    // todo: regenerate scripts for path and compare for utxo (paranoid mode)
                                    if (self.primaryPrivateKey) {
                                        privKey = Wallet.deriveByPath(self.primaryPrivateKey, path, "m").keyPair;
                                    } else if (self.backupPrivateKey) {
                                        privKey = Wallet.deriveByPath(self.backupPrivateKey, path.replace(/^m\/(\d+)\'/, 'm/$1'), "m").keyPair;
                                    } else {
                                        throw new Error("No master privateKey present");
                                    }

                                    redeemScript = new Buffer(utxos[i]['redeem_script'], 'hex');

                                    if (typeof utxos[i]['witness_script'] === 'string') {
                                        witnessScript = new Buffer(utxos[i]['witness_script'], 'hex');
                                    }

                                    var sigHash = bitcoin.Transaction.SIGHASH_ALL;
                                    if (self.bitcoinCash) {
                                        sigHash |= bitcoin.Transaction.SIGHASH_BITCOINCASHBIP143;
                                    }

                                    txb.sign(i, privKey, redeemScript, sigHash, utxos[i].value, witnessScript);
                                }
                            }

                            tx = txb.buildIncomplete();

                            cb();
                        },
                        /**
                         * estimate fee to verify that the API is not providing us wrong data
                         *
                         * @param cb
                         */
                        function(cb) {
                            var estimatedFee = Wallet.estimateVsizeFee(tx, utxos);

                            switch (feeStrategy) {

                                case Wallet.FEE_STRATEGY_BASE_FEE:

                                    if (Math.abs(estimatedFee - fee) > blocktrail.BASE_FEE) {
                                        return cb(new blocktrail.WalletFeeError("the fee suggested by the coin selection (" + fee + ") " +
                                            "seems incorrect (" + estimatedFee + ") for FEE_STRATEGY_BASE_FEE"));
                                    }
                                break;

                                case Wallet.FEE_STRATEGY_OPTIMAL:
                                    if (fee > estimatedFee * 50) {
                                        return cb(new blocktrail.WalletFeeError("the fee suggested by the coin selection (" + fee + ") " +
                                            "seems awefully high (" + estimatedFee + ") for FEE_STRATEGY_OPTIMAL"));
                                    }
                                break;
                            }

                            cb();

                        }
                    ], function(err) {
                        if (err) {
                            deferred.reject(new blocktrail.WalletSendError(err));
                            return;
                        }

                        deferred.resolve([tx, utxos]);
                    });

                    return deferred.promise;
                }
            )
        );

    });

    return deferred.promise;
};

/**
 * use the API to get the best inputs to use based on the outputs
 *
 * @param pay               array       {'address': (int)value}     coins to send
 * @param [lockUTXO]        bool        lock UTXOs for a few seconds to allow for transaction to be created
 * @param [allowZeroConf]   bool        allow zero confirmation unspent outputs to be used in coin selection
 * @param [feeStrategy]     string      defaults to FEE_STRATEGY_OPTIMAL
 * @param [options]         object
 * @param [cb]              function    callback(err, utxos, fee, change)
 * @returns {q.Promise}
 */
Wallet.prototype.coinSelection = function(pay, lockUTXO, allowZeroConf, feeStrategy, options, cb) {
    var self = this;

    if (typeof lockUTXO === "function") {
        cb = lockUTXO;
        lockUTXO = true;
    } else if (typeof allowZeroConf === "function") {
        cb = allowZeroConf;
        allowZeroConf = false;
    } else if (typeof feeStrategy === "function") {
        cb = feeStrategy;
        feeStrategy = null;
    } else if (typeof options === "function") {
        cb = options;
        options = {};
    }

    lockUTXO = typeof lockUTXO !== "undefined" ? lockUTXO : true;
    feeStrategy = feeStrategy || Wallet.FEE_STRATEGY_OPTIMAL;
    options = options || {};

    return self.sdk.coinSelection(self.identifier, pay, lockUTXO, allowZeroConf, feeStrategy, options, cb);
};

/**
 * send the transaction using the API
 *
 * @param txHex             string      partially signed transaction as hex string
 * @param paths             array       list of paths used in inputs which should be cosigned by the API
 * @param checkFee          bool        when TRUE the API will verify if the fee is 100% correct and otherwise throw an exception
 * @param [twoFactorToken]  string      2FA token
 * @param prioboost         bool
 * @param [cb]              function    callback(err, txHash)
 * @returns {q.Promise}
 */
Wallet.prototype.sendTransaction = function(txHex, paths, checkFee, twoFactorToken, prioboost, cb) {
    var self = this;

    if (typeof twoFactorToken === "function") {
        cb = twoFactorToken;
        twoFactorToken = null;
        prioboost = false;
    } else if (typeof prioboost === "function") {
        cb = twoFactorToken;
        prioboost = false;
    }

    var deferred = q.defer();
    deferred.promise.nodeify(cb);

    self.sdk.sendTransaction(self.identifier, txHex, paths, checkFee, twoFactorToken, prioboost)
        .then(
            function(result) {
                deferred.resolve(result);
            },
            function(e) {
                if (e.requires_2fa) {
                    deferred.reject(new blocktrail.WalletMissing2FAError());
                } else if (e.message.match(/Invalid two_factor_token/)) {
                    deferred.reject(new blocktrail.WalletInvalid2FAError());
                } else {
                    deferred.reject(e);
                }
            }
        )
    ;

    return deferred.promise;
};

/**
 * setup a webhook for this wallet
 *
 * @param url           string      URL to receive webhook events
 * @param [identifier]  string      identifier for the webhook, defaults to WALLET- + wallet.identifier
 * @param [cb]          function    callback(err, webhook)
 * @returns {q.Promise}
 */
Wallet.prototype.setupWebhook = function(url, identifier, cb) {
    var self = this;

    if (typeof identifier === "function") {
        cb = identifier;
        identifier = null;
    }

    identifier = identifier || ('WALLET-' + self.identifier);

    return self.sdk.setupWalletWebhook(self.identifier, identifier, url, cb);
};

/**
 * delete a webhook that was created for this wallet
 *
 * @param [identifier]  string      identifier for the webhook, defaults to WALLET- + wallet.identifier
 * @param [cb]          function    callback(err, success)
 * @returns {q.Promise}
 */
Wallet.prototype.deleteWebhook = function(identifier, cb) {
    var self = this;

    if (typeof identifier === "function") {
        cb = identifier;
        identifier = null;
    }

    identifier = identifier || ('WALLET-' + self.identifier);

    return self.sdk.deleteWalletWebhook(self.identifier, identifier, cb);
};

/**
 * get all transactions for the wallet (paginated)
 *
 * @param [params]  object      pagination: {page: 1, limit: 20, sort_dir: 'asc'}
 * @param [cb]      function    callback(err, transactions)
 * @returns {q.Promise}
 */
Wallet.prototype.transactions = function(params, cb) {
    var self = this;

    return self.sdk.walletTransactions(self.identifier, params, cb);
};

Wallet.prototype.maxSpendable = function(allowZeroConf, feeStrategy, options, cb) {
    var self = this;

    if (typeof allowZeroConf === "function") {
        cb = allowZeroConf;
        allowZeroConf = false;
    } else if (typeof feeStrategy === "function") {
        cb = feeStrategy;
        feeStrategy = null;
    } else if (typeof options === "function") {
        cb = options;
        options = {};
    }

    if (typeof allowZeroConf === "object") {
        options = allowZeroConf;
        allowZeroConf = false;
    } else if (typeof feeStrategy === "object") {
        options = feeStrategy;
        feeStrategy = null;
    }

    options = options || {};

    if (typeof options.allowZeroConf !== "undefined") {
        allowZeroConf = options.allowZeroConf;
    }
    if (typeof options.feeStrategy !== "undefined") {
        feeStrategy = options.feeStrategy;
    }

    feeStrategy = feeStrategy || Wallet.FEE_STRATEGY_OPTIMAL;

    return self.sdk.walletMaxSpendable(self.identifier, allowZeroConf, feeStrategy, options, cb);
};

/**
 * get all addresses for the wallet (paginated)
 *
 * @param [params]  object      pagination: {page: 1, limit: 20, sort_dir: 'asc'}
 * @param [cb]      function    callback(err, addresses)
 * @returns {q.Promise}
 */
Wallet.prototype.addresses = function(params, cb) {
    var self = this;

    return self.sdk.walletAddresses(self.identifier, params, cb);
};

/**
 * @param address   string      the address to label
 * @param label     string      the label
 * @param [cb]      function    callback(err, res)
 * @returns {q.Promise}
 */
Wallet.prototype.labelAddress = function(address, label, cb) {
    var self = this;

    return self.sdk.labelWalletAddress(self.identifier, address, label, cb);
};

/**
 * get all UTXOs for the wallet (paginated)
 *
 * @param [params]  object      pagination: {page: 1, limit: 20, sort_dir: 'asc'}
 * @param [cb]      function    callback(err, addresses)
 * @returns {q.Promise}
 */
Wallet.prototype.utxos = function(params, cb) {
    var self = this;

    return self.sdk.walletUTXOs(self.identifier, params, cb);
};

Wallet.prototype.unspentOutputs = Wallet.prototype.utxos;

/**
 * sort list of pubkeys to be used in a multisig redeemscript
 *  sorted in lexicographical order on the hex of the pubkey
 *
 * @param pubKeys   {bitcoin.HDNode[]}
 * @returns string[]
 */
Wallet.sortMultiSigKeys = function(pubKeys) {
    pubKeys.sort(function(key1, key2) {
        return key1.toString('hex').localeCompare(key2.toString('hex'));
    });

    return pubKeys;
};

/**
 * determine how much fee is required based on the inputs and outputs
 *  this is an estimation, not a proper 100% correct calculation
 *
 * @todo: mark deprecated in favor of estimations where UTXOS are known
 * @param {bitcoin.Transaction} tx
 * @param {int} feePerKb when not null use this feePerKb, otherwise use BASE_FEE legacy calculation
 * @returns {number}
 */
Wallet.estimateIncompleteTxFee = function(tx, feePerKb) {
    var size = Wallet.estimateIncompleteTxSize(tx);
    var sizeKB = size / 1000;
    var sizeKBCeil = Math.ceil(size / 1000);

    if (feePerKb) {
        return parseInt(sizeKB * feePerKb, 10);
    } else {
        return parseInt(sizeKBCeil * blocktrail.BASE_FEE, 10);
    }
};

/**
 * Takes tx and utxos, computing their estimated vsize,
 * and uses feePerKb (or BASEFEE as default) to estimate
 * the number of satoshis in fee.
 *
 * @param {bitcoin.Transaction} tx
 * @param {Array} utxos
 * @param feePerKb
 * @returns {Number}
 */
Wallet.estimateVsizeFee = function(tx, utxos, feePerKb) {
    var vsize = SizeEstimation.estimateTxVsize(tx, utxos);
    var sizeKB = vsize / 1000;
    var sizeKBCeil = Math.ceil(vsize / 1000);

    if (feePerKb) {
        return parseInt(sizeKB * feePerKb, 10);
    } else {
        return parseInt(sizeKBCeil * blocktrail.BASE_FEE, 10);
    }
};

/**
 * determine how much fee is required based on the inputs and outputs
 *  this is an estimation, not a proper 100% correct calculation
 *
 * @param {bitcoin.Transaction} tx
 * @returns {number}
 */
Wallet.estimateIncompleteTxSize = function(tx) {
    var size = 4 + 4 + 4 + 4; // version + txinVarInt + txoutVarInt + locktime

    size += tx.outs.length * 34;

    tx.ins.forEach(function(txin) {
        var scriptSig = txin.script,
            scriptType = bitcoin.script.classifyInput(scriptSig);

        var multiSig = [2, 3]; // tmp hardcoded

        // Re-classify if P2SH
        if (!multiSig && scriptType === 'scripthash') {
            var sigChunks = bitcoin.script.decompile(scriptSig);
            var redeemScript = sigChunks.slice(-1)[0];
            scriptSig = bitcoin.script.compile(sigChunks.slice(0, -1));
            scriptType = bitcoin.script.classifyInput(scriptSig);

            if (bitcoin.script.classifyOutput(redeemScript) !== scriptType) {
                throw new blocktrail.TransactionInputError('Non-matching scriptSig and scriptPubKey in input');
            }

            // figure out M of N for multisig (code from internal usage of bitcoinjs)
            if (scriptType === 'multisig') {
                var rsChunks = bitcoin.script.decompile(redeemScript);
                var mOp = rsChunks[0];
                if (mOp === bitcoin.opcodes.OP_0 || mOp < bitcoin.opcodes.OP_1 || mOp > bitcoin.opcodes.OP_16) {
                    throw new blocktrail.TransactionInputError("Invalid multisig redeemScript");
                }

                var nOp = rsChunks[redeemScript.chunks.length - 2];
                if (mOp === bitcoin.opcodes.OP_0 || mOp < bitcoin.opcodes.OP_1 || mOp > bitcoin.opcodes.OP_16) {
                    throw new blocktrail.TransactionInputError("Invalid multisig redeemScript");
                }

                var m = mOp - (bitcoin.opcodes.OP_1 - 1);
                var n = nOp - (bitcoin.opcodes.OP_1 - 1);
                if (n < m) {
                    throw new blocktrail.TransactionInputError("Invalid multisig redeemScript");
                }

                multiSig = [m, n];
            }
        }

        if (multiSig) {
            size += (
                32 + // txhash
                4 + // idx
                3 + // scriptVarInt[>=253]
                1 + // OP_0
                ((1 + 72) * multiSig[0]) + // (OP_PUSHDATA[<75] + 72) * sigCnt
                (2 + 105) + // OP_PUSHDATA[>=75] + script
                4 // sequence
            );

        } else {
            size += 32 + // txhash
                4 + // idx
                73 + // sig
                34 + // script
                4; // sequence
        }
    });

    return size;
};

/**
 * determine how much fee is required based on the amount of inputs and outputs
 *  this is an estimation, not a proper 100% correct calculation
 *  this asumes all inputs are 2of3 multisig
 *
 * @todo: mark deprecated in favor of situations where UTXOS are known
 * @param txinCnt       {number}
 * @param txoutCnt      {number}
 * @returns {number}
 */
Wallet.estimateFee = function(txinCnt, txoutCnt) {
    var size = 4 + 4 + 4 + 4; // version + txinVarInt + txoutVarInt + locktime

    size += txoutCnt * 34;

    size += (
            32 + // txhash
            4 + // idx
            3 + // scriptVarInt[>=253]
            1 + // OP_0
            ((1 + 72) * 2) + // (OP_PUSHDATA[<75] + 72) * sigCnt
            (2 + 105) + // OP_PUSHDATA[>=75] + script
            4 // sequence
        ) * txinCnt;

    var sizeKB = Math.ceil(size / 1000);

    return sizeKB * blocktrail.BASE_FEE;
};

/**
 * create derived key from parent key by path
 *
 * @param hdKey     {bitcoin.HDNode}
 * @param path      string
 * @param keyPath   string
 * @returns {bitcoin.HDNode}
 */
Wallet.deriveByPath = function(hdKey, path, keyPath) {
    keyPath = keyPath || (!!hdKey.keyPair.d ? "m" : "M");

    if (path[0].toLowerCase() !== "m" || keyPath[0].toLowerCase() !== "m") {
        throw new blocktrail.KeyPathError("Wallet.deriveByPath only works with absolute paths. (" + path + ", " + keyPath + ")");
    }

    if (path[0] === "m" && keyPath[0] === "M") {
        throw new blocktrail.KeyPathError("Wallet.deriveByPath can't derive private path from public parent. (" + path + ", " + keyPath + ")");
    }

    // if the desired path is public while the input is private
    var toPublic = path[0] === "M" && keyPath[0] === "m";
    if (toPublic) {
        // derive the private path, convert to public when returning
        path[0] = "m";
    }

    // keyPath should be the parent parent of path
    if (path.toLowerCase().indexOf(keyPath.toLowerCase()) !== 0) {
        throw new blocktrail.KeyPathError("Wallet.derivePath requires path (" + path + ") to be a child of keyPath (" + keyPath + ")");
    }

    // remove the part of the path we already have
    path = path.substr(keyPath.length);

    // iterate over the chunks and derive
    var newKey = hdKey;
    path.replace(/^\//, "").split("/").forEach(function(chunk) {
        if (!chunk) {
            return;
        }

        if (chunk.indexOf("'") !== -1) {
            chunk = parseInt(chunk.replace("'", ""), 10) + bitcoin.HDNode.HIGHEST_BIT;
        }

        newKey = newKey.derive(parseInt(chunk, 10));
    });

    if (toPublic) {
        return newKey.neutered();
    } else {
        return newKey;
    }
};

module.exports = Wallet;

blocktrail / blocktrail-sdk-nodejs

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