add blockchain install scripts

lib/blockchain/common.js

@@ -0,0 +1,61 @@
+const crypto = require('crypto')
+const os = require('os')
+const path = require('path')
+const cp = require('child_process')
+const logger = require('console-log-level')({level: 'info'})
+
+module.exports = {es, firewall, randomPass, fetchAndInstall, logger}
+
+const BINARIES = {
+  BTC: {
+    url: 'https://bitcoin.org/bin/bitcoin-core-0.14.2/bitcoin-0.14.2-x86_64-linux-gnu.tar.gz',
+    dir: 'bitcoin-0.14.2/bin'
+  },
+  ETH: {
+    url: 'https://gethstore.blob.core.windows.net/builds/geth-linux-amd64-1.6.6-10a45cb5.tar.gz',
+    dir: 'geth-linux-amd64-1.6.6-10a45cb5'
+  },
+  ZEC: {
+    url: 'https://z.cash/downloads/zcash-1.0.10-1-linux64.tar.gz',
+    dir: 'zcash-1.0.10-1/bin'
+  },
+  DASH: {
+    url: 'https://www.dash.org/binaries/dashcore-0.12.1.5-linux64.tar.gz',
+    dir: 'dashcore-0.12.1/bin'
+  },
+  LTC: {
+    url: 'https://download.litecoin.org/litecoin-0.13.2/linux/litecoin-0.13.2-x86_64-linux-gnu.tar.gz',
+    dir: 'litecoin-0.13.2/bin'
+  }
+}
+
+function firewall (ports) {
+  if (!ports || ports.length === 0) throw new Error('No ports supplied')
+  const portsString = ports.join(',')
+  es(`sudo ufw allow ${portsString}`)
+}
+
+function randomPass () {
+  return crypto.randomBytes(32).toString('hex')
+}
+
+function es (cmd) {
+  const env = {HOME: os.userInfo().homedir}
+  const options = {encoding: 'utf8', env}
+  const res = cp.execSync(cmd, options)
+  logger.debug(res)
+  return res.toString()
+}
+
+function fetchAndInstall (crypto) {
+  const binaries = BINARIES[crypto.cryptoCode]
+  if (!binaries) throw new Error(`No such coin: ${crypto.code}`)
+
+  const url = binaries.url
+  const downloadFile = path.basename(url)
+  const binDir = binaries.dir
+
+  es(`wget -q ${url}`)
+  es(`tar -xzf ${downloadFile}`)
+  es(`sudo cp ${binDir}/* /usr/local/bin`)
+}