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const axios = require("axios");
const bcrypt = require("bcrypt");
const jwt = require("jsonwebtoken");
const authenticator = require("otplib").authenticator;
const getAccount = require("../lib/account");
const Sequelize = require("sequelize");
const bitcoin = require("bitcoinjs-lib");
const liquid = require("@asoltys/liquidjs-lib");
const { fromBase58, fromPrivateKey } = require("bip32");
const { Mutex } = require("async-mutex");
const bip32 = require("bip32");

const pick = (O, ...K) => K.reduce((o, k) => ((o[k] = O[k]), o), {});
require("../lib/whitelist");

const twofa = ah((req, res, next) => {
  let {
    user,
    body: { token }
  } = req;
  if (
    user.twofa &&
    (typeof token === "undefined" ||
      !authenticator.check(token, user.otpsecret))
  ) {
    return res.status(401).send("2fa required");
  } else next();
});

app.get(
  "/users/:username",
  ah(async (req, res) => {
    const { username } = req.params;

    const user = await db.User.findOne({
      attributes: ["username"],
      where: Sequelize.where(
        Sequelize.fn("lower", Sequelize.col("username")),
        username.toLowerCase()
      )
    });

    if (user) res.send(user);
    else res.status(500).send("User not found");
  })
);

app.post(
  "/register",
  ah(async (req, res) => {
    try {
      const ip = req.headers["x-forwarded-for"] || req.connection.remoteAddress;
      const user = await register(req.body.user, ip, false);
      res.send(pick(user, ...whitelist));
    } catch (e) {
      res.status(500).send(e.message);
    }
  })
);

app.post(
  "/disable2fa",
  auth,
  twofa,
  ah(async (req, res) => {
    let { user } = req;
    user.twofa = false;
    await user.save();
    emit(user.username, "user", user);
    emit(user.username, "otpsecret", user.otpsecret);
    l.info("disabled 2fa", user.username);
    res.end();
  })
);

app.get(
  "/otpsecret",
  auth,
  twofa,
  ah(async (req, res) => {
    let { user } = req;
    emit(user.username, "otpsecret", user.otpsecret);
    res.end();
  })
);

app.post(
  "/2fa",
  auth,
  ah(async (req, res) => {
    let { user } = req;
    try {
      const isValid = authenticator.check(req.body.token, req.user.otpsecret);
      if (isValid) {
        user.twofa = true;
        user.save();
        emit(user.username, "user", req.user);
      } else {
        return res.status(500).send("Invalid token");
      }
    } catch (e) {
      l.error("error setting up 2fa", e);
    }

    l.info("enabled 2fa", user.username);
    res.end();
  })
);

app.get(
  "/exists",
  ah(async (req, res) => {
    let exists = await db.User.findOne({
      where: { username: req.query.username }
    });

    res.send(!!exists);
  })
);

app.post(
  "/user",
  auth,
  ah(async (req, res) => {
    try {
      let { user } = req;
      let {
        username,
        fiat,
        unit,
        currency,
        currencies,
        twofa,
        pin,
        password,
        confirm,
        tokens,
        seed
      } = req.body;

      let exists = await db.User.findOne({
        where: { username }
      });

      let token;
      if (user.username !== username && exists) {
        l.error("username taken", username, user.username, exists.username);
        return res.status(500).send("Username taken");
      } else {
        sockets[username] = sockets[user.username];
        if (user.username !== username) l.info("changing username", user.username, username);
        user.username = username;

        token = jwt.sign({ username }, config.jwt);
        res.cookie("token", token, {
          expires: new Date(Date.now() + 432000000)
        });
      }

      if (unit) user.unit = unit;
      user.currency = currency;
      user.currencies = currencies;

      user.tokens = tokens;
      user.twofa = twofa;
      user.pin = pin;
      user.seed = seed;
      user.fiat = fiat;

      if (password && password === confirm) {
        user.password = await bcrypt.hash(password, 1);
      }

      await user.save();
      emit(user.username, "user", user);
      res.send({ user, token });
    } catch (e) {
      l.error("error updating user", e.message);
    }
  })
);

app.post(
  "/keys",
  auth,
  ah(async (req, res) => {
    const { key: hex } = req.body;
    const key = await db.Key.create({
      user_id: req.user.id,
      hex
    });
    emit(req.user.username, "key", key);
    res.send(key);
  })
);

app.post(
  "/keys/delete",
  auth,
  ah(async (req, res) => {
    const { hex } = req.body;
    (
      await db.Key.findOne({
        where: {
          user_id: req.user.id,
          hex
        }
      })
    ).destroy();
  })
);

app.post(
  "/updateSeeds",
  auth,
  ah(async (req, res) => {
    let { user } = req;
    let { seeds } = req.body;
    let keys = Object.keys(seeds);

    for (let i = 0; i < keys.length; i++) {
      let id = keys[i];
      let seed = seeds[id];
      await db.Account.update(
        { seed },
        {
          where: { id, user_id: user.id }
        }
      );

      const account = await db.Account.findOne({
        where: { id }
      });

      emit(user.username, "account", account);
    }

    res.end();
  })
);

app.post(
  "/accounts/delete",
  auth,
  ah(async (req, res) => {
    const { id } = req.body;
    const account = await db.Account.findOne({ where: { id } });
    if (account) await account.destroy();
    res.end();
  })
);

app.post(
  "/accounts",
  auth,
  ah(async (req, res) => {
    const {
      name,
      seed,
      pubkey,
      ticker,
      precision,
      path,
      privkey,
      network
    } = req.body;
    const { user } = req;

    let account = await db.Account.create({
      user_id: user.id,
      asset: config.liquid.btcasset,
      balance: 0,
      pending: 0,
      name,
      ticker,
      precision,
      pubkey,
      privkey,
      seed,
      path,
      network
    });

    emit(user.username, "account", account);

    if (pubkey) user.index++;
    user.account_id = account.id;
    await user.save();
    user.account = account;
    emit(user.username, "user", user);

    res.send(account);
  })
);

app.post(
  "/taboggan",
  ah(async (req, res) => {
    try {
      const { params, sig, key } = req.body;

      if (sig) {
        const { callback } = params;

        try {
          const url = `${callback}&sig=${sig}&key=${key}`;
          const response = await axios.get(url);
          res.send(response.data);
        } catch (e) {
          l.error("problem calling lnurl login", e.message);
          res.status(500).send(e.message);
        }

        return;
      }

      let twofa = req.body.token;

      let user = await getUser(req.body.username);

      if (
        !user ||
        (user.password &&
          !(await bcrypt.compare(req.body.password, user.password)))
      ) {
        l.warn(
          "invalid username or password attempt",
          req.body.username
        );
        return res.status(401).end();
      }

      if (
        user.twofa &&
        (typeof twofa === "undefined" ||
          !authenticator.check(twofa, user.otpsecret))
      ) {
        return res.status(401).send("2fa required");
      }

      l.info(
        "login",
        req.body.username,
        req.headers["x-forwarded-for"] || req.connection.remoteAddress
      );

      let payload = { username: user.username };
      let token = jwt.sign(payload, config.jwt);
      res.cookie("token", token, { expires: new Date(Date.now() + 432000000) });
      user.accounts = await user.getAccounts();
      user.keys = await user.getKeys();
      user = pick(user, ...whitelist);
      res.send({ user, token });
    } catch (e) {
      l.error("login error", e.message);
      res.status(401).end();
    }
  })
);

app.post(
  "/logout",
  optionalAuth,
  ah(async (req, res) => {
    let { subscription } = req.body;
    if (!subscription) return res.end();

    const { username } = req.user;

    if (username) {
      l.info("logging out", username);
      let i = req.user.subscriptions.findIndex(
        s => JSON.stringify(s) === subscription
      );
      if (i > -1) {
        req.user.subscriptions.splice(i, 1);
      }
      await req.user.save();
      Object.keys(logins).map(
        k => logins[k]["username"] === username && delete logins[k]
      );
    }

    res.end();
  })
);

app.get(
  "/address",
  ah(async (req, res) => {
    let { network, type } = req.query;
    let address, confidentialAddress;

    type = {
      bech32: "p2wpkh",
      "p2sh-segwit": "p2sh",
      legacy: "p2pkh"
    }[type];
    if (!type) type = "p2wpkh";

    let hd, i, p, n;
    const mutex = new Mutex();
    const release = await mutex.acquire();
    try {
      if (network === "bitcoin") {
        if (!config.bitcoin)
          return res.status(500).send("Bitcoin not configured");
        p = bitcoin.payments;
        n = prod ? bitcoin.networks["bitcoin"] : bitcoin.networks["regtest"];

        i = parseInt(app.get("bcAddressIndex"));
        hd = fromBase58(config.bitcoin.masterkey, n).derivePath(
          `m/0'/0'/${i}'`
        );

        // async request to node to bump its internal index but don't use result
        bc.getNewAddress().catch(console.error);

        app.set("bcAddressIndex", i + 1);
      } else if (network === "liquid") {
        p = liquid.payments;
        n =
          liquid.networks[
            config.liquid.network === "mainnet"
              ? "liquid"
              : config.liquid.network
          ];
        type = "p2sh";
        
        // async request to node to bump its internal index but don't use result
        lq.getNewAddress().catch(console.error);

        i = parseInt(app.get("lqAddressIndex"));
        hd = fromBase58(config.liquid.masterkey, n).derivePath(`m/0'/0'/${i}'`);
        app.set("lqAddressIndex", i + 1);
      } else {
        throw new Error("Unsupported network");
      }
    } finally {
      release();
    }

    if (type !== "p2sh") {
      ({ address } = p[type]({
        pubkey: hd.publicKey,
        network: n
      }));
    } else {
      if (network === "liquid") {
        const p2wpkh = p.p2wpkh({
          pubkey: hd.publicKey,
          network: n
        });

        const blindkey = fromPrivateKey(
          Buffer.from(config.liquid.blindkey, "hex"),
          hd.chainCode,
          n
        );

        ({ address, confidentialAddress } = p[type]({
          redeem: p2wpkh,
          network: n,
          blindkey: blindkey.publicKey
        }));

        lq.importBlindingKey(
          confidentialAddress,
          blindkey.privateKey.toString("hex")
        );
      } else {
        ({ address } = p[type]({
          redeem: p.p2wpkh({
            pubkey: hd.publicKey,
            network: n
          }),
          network: n
        }));
      }
    }

    res.send({ address, confidentialAddress });
  })
);

app.post(
  "/account",
  auth,
  ah(async (req, res) => {
    const { user } = req;
    const {
      id,
      name,
      ticker,
      precision,
      domain,
      seed,
      pubkey,
      privkey,
      path,
      hide,
      index
    } = req.body;

    try {
      await db.transaction(async transaction => {
        let account = await db.Account.findOne({
          where: { id, user_id: user.id },
          lock: transaction.LOCK.UPDATE,
          transaction
        });

        let params = {
          name,
          ticker,
          precision,
          domain,
          seed,
          pubkey,
          path,
          hide,
          index,
          privkey
        };

        if (!account || (account.pubkey && !pubkey)) delete params.pubkey;

        await db.Account.update(params, {
          where: { id, user_id: user.id },
          transaction
        });

        await account.reload({ transaction });
        emit(user.username, "account", account);
        res.end();
      });
    } catch (e) {
      l.error(e.message);
      return res.status(500).send("There was a problem updating the account");
    }
  })
);

app.post(
  "/shiftAccount",
  auth,
  ah(async (req, res) => {
    let { user } = req;
    let { id } = req.body;

    try {
      const account = await db.Account.findOne({
        where: { id, user_id: user.id }
      });

      user.account_id = account.id;
      await user.save();
      let payments = await db.Payment.findAll({
        where: {
          user_id: user.id,
          account_id: id
        },
        order: [["id", "DESC"]],
        limit: 12,
        include: {
          model: db.Account,
          as: "account"
        }
      });
      user.payments = payments;
      user.account = account.get({ plain: true });

      emit(user.username, "account", user.account);
      emit(user.username, "user", user);

      res.send(user);
    } catch (e) {
      l.error(e.message);
      return res.status(500).send("There was a problem switching accounts");
    }
  })
);

app.get("/vapidPublicKey", function(req, res) {
  res.send(config.vapid.publicKey);
});

app.post(
  "/subscribe",
  auth,
  ah(async function(req, res) {
    let { subscriptions } = req.user;
    let { subscription } = req.body;
    if (!subscriptions) subscriptions = [];
    if (
      !subscriptions.find(
        s => JSON.stringify(s) === JSON.stringify(subscription)
      )
    )
      subscriptions.push(subscription);
    req.user.subscriptions = subscriptions;
    l.info("subscribing", req.user.username);
    await req.user.save();
    res.sendStatus(201);
  })
);

app.post(
  "/redeem",
  optionalAuth,
  ah(async function(req, res) {
    return res.status(500).send("Vouchers temporarily disabled");
    const { redeemcode } = req.body;
    if (!redeemcode) fail("no code provided");

    let { user } = req;

    const source = await db.Payment.findOne({
      where: {
        redeemcode: req.body.redeemcode
      },
      include: {
        model: db.Account,
        as: "account"
      }
    });

    l.info("redeeming", redeemcode);

    if (!source) fail("Invalid code");
    if (source.redeemed) fail("Voucher has already been redeemed");

    if (!user) {
      const ip = req.headers["x-forwarded-for"] || req.connection.remoteAddress;
      user = await register(
        {
          username: redeemcode.substr(0, 8),
          password: ""
        },
        ip,
        false
      );

      let payload = { username: user.username };
      let token = jwt.sign(payload, config.jwt);
      res.cookie("token", token, { expires: new Date(Date.now() + 432000000) });
      return res.send({ user });
    } else {
      l.info("user", user.username);
    }

    await db.transaction(async transaction => {
      let account = await getAccount(source.account.asset, user, transaction);
      let { hash, memo, confirmed, fee, network } = source;

      source.redeemed = true;
      await source.save();

      let payment = await db.Payment.create(
        {
          amount: -source.amount,
          account_id: account.id,
          user_id: user.id,
          hash: "Voucher " + redeemcode,
          memo,
          rate: app.get("rates")[user.currency],
          currency: user.currency,
          confirmed,
          network,
          received: true,
          fee
        },
        { transaction }
      );

      await account.decrement({ balance: source.amount }, { transaction });
      await account.reload({ transaction });

      payment = payment.get({ plain: true });
      payment.account = account.get({ plain: true });
      emit(user.username, "payment", payment);
      emit(user.username, "account", account);

      res.send({ payment });
    });
  })
);

app.post(
  "/checkRedeemCode",
  auth,
  ah(async function(req, res) {
    const { redeemcode } = req.body;

    const payment = await db.Payment.findOne({ where: { redeemcode } });
    res.send(payment);
  })
);

app.post(
  "/password",
  auth,
  ah(async function(req, res) {
    const { user } = req;
    const { password } = req.body;

    if (!user.password) return res.send(true);
    res.send(await bcrypt.compare(password, user.password));
  })
);

app.get(
  "/isInternal",
  auth,
  ah(async function(req, res) {
    let { user } = req;
    let { address } = req.query;
    if (!address) throw new Error("Address not provided");

    let invoice = await db.Invoice.findOne({
      where: { address },
      include: {
        attributes: ["username"],
        model: db.User,
        as: "user"
      }
    });

    if (invoice) {
      let info;
      try {
        info = await bc.getAddressInfo(address);
      } catch (e) {
        info = await lq.getAddressInfo(address);
      }
      if (info.ismine) {
        emit(user.username, "to", invoice.user);
        return res.send(true);
      }
    }

    res.send(false);
  })
);