Add sms/email notifications on transactions (#198)

* Add sms/email notifications on transactions

* Add configuration for transaction notification

* Add notification on provision address error

* Remove unneeded noop from promises

lib/plugins.js

@@ -18,6 +18,7 @@ const sms = require('./sms')
 const email = require('./email')
 const cashOutHelper = require('./cash-out/cash-out-helper')
 const machineLoader = require('./machine-loader')
+const customers = require('./customers')
 const coinUtils = require('./coin-utils')
 
 const mapValuesWithKey = _.mapValues.convert({cap: false})
@@ -58,6 +59,11 @@ function plugins (settings, deviceId) {
     return rates
   }
 
+  function transactionNotificationsEnabled () {
+    const config = configManager.unscoped(settings.config)
+    return config.transactionNotificationsEnabled
+  }
+
   function notificationsEnabled () {
     const config = configManager.unscoped(settings.config)
     return config.notificationsEnabled
@@ -324,6 +330,73 @@ function plugins (settings, deviceId) {
       })
   }
 
+  function notifyOperator (tx, rec) {
+    if (!transactionNotificationsEnabled()) return Promise.resolve()
+
+    const isCashOut = tx.direction === 'cashOut'
+    const zeroConf = isZeroConf(tx)
+
+    // 0-conf cash-out should only send notification on redemption
+    if (zeroConf && isCashOut && !rec.isRedemption && !rec.error) return Promise.resolve()
+
+    if (!zeroConf && rec.isRedemption) return sendRedemptionMessage(tx.id, rec.error)
+
+    const customerPromise = tx.customerId ? customers.getById(tx.customerId) : Promise.resolve({})
+
+    return Promise.all([machineLoader.getMachineName(tx.deviceId), customerPromise])
+      .then(([machineName, customer]) => {
+        const direction = isCashOut ? 'Cash Out' : 'Cash In'
+        const crypto = `${coinUtils.toUnit(tx.cryptoAtoms, tx.cryptoCode)} ${tx.cryptoCode}`
+        const fiat = `${tx.fiat} ${tx.fiatCode}`
+        const customerName = customer.name || customer.id
+        const phone = customer.phone ? `- Phone: ${customer.phone}` : ''
+
+        let status
+        if (rec.error) {
+          status = `Error - ${rec.error}`
+        } else {
+          status = !isCashOut ? 'Successful' : !rec.isRedemption
+            ? 'Successful & awaiting redemption' : 'Successful & dispensed'
+        }
+
+        const body = `
+          - Transaction ID: ${tx.id}
+          - Status: ${status}
+          - Machine name: ${machineName} 
+          - ${direction}
+          - ${fiat}
+          - ${crypto}
+          - Customer: ${customerName}
+          ${phone}
+        `
+        const subject = `A transaction just happened`
+
+        return {
+          sms: {
+            body: `${subject} - ${status}`
+          },
+          email: {
+            subject,
+            body
+          }
+        }
+      })
+      .then(sendTransactionMessage)
+  }
+
+  function sendRedemptionMessage (txId, error) {
+    const subject = `Here's an update on transaction ${txId}`
+    const body = error ? `Error: ${error}` : 'It was just dispensed successfully'
+
+    const rec = {
+      sms: {
+        body: `${subject} - ${body}`
+      },
+      email: { subject, body }
+    }
+    return sendTransactionMessage(rec)
+  }
+
   function pong () {
     db.none('insert into server_events (event_type) values ($1)', ['ping'])
       .catch(logger.error)
@@ -495,6 +568,16 @@ function plugins (settings, deviceId) {
     return Promise.all(promises)
   }
 
+  function sendTransactionMessage (rec) {
+    const config = configManager.unscoped(settings.config)
+
+    let promises = []
+    if (config.transactionNotificationsEmailEnabled) promises.push(email.sendMessage(settings, rec))
+    if (config.transactionNotificationsSMSEnabled) promises.push(sms.sendMessage(settings, rec))
+
+    return Promise.all(promises)
+  }
+
   function checkDevicesCashBalances (fiatCode, devices) {
     return _.map(device => checkDeviceCashBalances(fiatCode, device), devices)
   }
@@ -657,7 +740,8 @@ function plugins (settings, deviceId) {
     buildAvailableCassettes,
     buy,
     sell,
-    notificationsEnabled
+    notificationsEnabled,
+    notifyOperator
   }
 }