Adds dynamic coupon codes and segment plugin

packages/medusa-plugin-segment/.babelrc

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+{
+  "plugins": [
+    "@babel/plugin-proposal-class-properties",
+    "@babel/plugin-transform-instanceof",
+    "@babel/plugin-transform-classes"
+  ],
+  "presets": ["@babel/preset-env"],
+  "env": {
+    "test": {
+      "plugins": ["@babel/plugin-transform-runtime"]
+    }
+  }
+}

packages/medusa-plugin-segment/.eslintrc

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+{
+  "plugins": ["prettier"],
+  "extends": ["prettier"],
+  "rules": {
+    "prettier/prettier": "error",
+    "semi": "error",
+    "no-unused-expressions": "true"
+  }
+}

packages/medusa-plugin-segment/.gitignore

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+/lib
+node_modules
+.DS_store
+.env*
+/*.js
+!index.js
+!jest.config.js
+
+/dist
+
+/api
+/services
+/models
+/subscribers
+

packages/medusa-plugin-segment/.npmignore

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+/lib
+node_modules
+.DS_store
+.env*
+/*.js
+!index.js
+yarn.lock
+
+

packages/medusa-plugin-segment/.prettierrc

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+{
+  "endOfLine": "lf",
+  "semi": false,
+  "singleQuote": false,
+  "tabWidth": 2,
+  "trailingComma": "es5"
+}

packages/medusa-plugin-segment/index.js

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+// noop

packages/medusa-plugin-segment/jest.config.js

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+module.exports = {
+  testEnvironment: "node",
+}

packages/medusa-plugin-segment/package.json

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+{
+  "name": "medusa-plugin-segment",
+  "version": "0.3.0",
+  "description": "Segment Analytics",
+  "main": "index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/medusajs/medusa",
+    "directory": "packages/medusa-plugin-segment"
+  },
+  "author": "Sebastian Rindom",
+  "license": "AGPL-3.0-or-later",
+  "devDependencies": {
+    "@babel/cli": "^7.7.5",
+    "@babel/core": "^7.7.5",
+    "@babel/node": "^7.7.4",
+    "@babel/plugin-proposal-class-properties": "^7.7.4",
+    "@babel/plugin-transform-classes": "^7.9.5",
+    "@babel/plugin-transform-instanceof": "^7.8.3",
+    "@babel/plugin-transform-runtime": "^7.7.6",
+    "@babel/preset-env": "^7.7.5",
+    "@babel/register": "^7.7.4",
+    "@babel/runtime": "^7.9.6",
+    "cross-env": "^5.2.1",
+    "eslint": "^6.8.0",
+    "jest": "^25.5.2"
+  },
+  "scripts": {
+    "build": "babel src -d .",
+    "prepare": "cross-env NODE_ENV=production npm run build",
+    "watch": "babel -w src --out-dir . --ignore **/__tests__",
+    "test": "jest"
+  },
+  "dependencies": {
+    "analytics-node": "^3.4.0-beta.1",
+    "axios": "^0.19.2",
+    "body-parser": "^1.19.0",
+    "express": "^4.17.1",
+    "medusa-core-utils": "^0.3.0",
+    "medusa-interfaces": "^0.3.0",
+    "medusa-test-utils": "^0.3.0"
+  }
+}

packages/medusa-plugin-segment/src/services/segment.js

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+import Analytics from "analytics-node"
+import axios from "axios"
+import { BaseService } from "medusa-interfaces"
+
+class SegmentService extends BaseService {
+  /**
+   * @param {Object} options - options defined in `medusa-config.js`
+   *    e.g.
+   *    {
+   *      write_key: Segment write key given in Segment dashboard
+   *    }
+   */
+  constructor({totalsService}, options) {
+    super()
+
+    this.options_ = options
+    this.totalsService_ = totalsService
+
+    this.analytics_ = new Analytics(options.write_key)
+  }
+
+  /**
+   * Wrapper around segment's identify call
+   */
+  identify(data) {
+    return this.analytics_.identify(data)
+  }
+
+  track(data) {
+    return this.analytics_.track(data)
+  }
+
+  async getReportingValue(fromCurrency, value) {
+    const date = "latest"
+    const toCurrency =
+      (this.options_.reporting_currency &&
+        this.options_.reporting_currency.toUpperCase()) ||
+      "EUR"
+
+    if (fromCurrency === toCurrency) return value.toFixed(2)
+
+    const exchangeRate = await axios
+      .get(`https://api.exchangeratesapi.io/${date}?symbols=${fromCurrency}&base=${toCurrency}`)
+      .then(({ data }) => {
+        return data.rates[fromCurrency]
+      })
+
+    return (value / exchangeRate).toFixed(2)
+  }
+
+
+  async buildOrder(order) {
+    console.log("build", order)
+    const subtotal = await this.totalsService_.getSubtotal(order)
+    const total = await this.totalsService_.getTotal(order)
+    const tax = await this.totalsService_.getTaxTotal(order)
+    const discount = await this.totalsService_.getDiscountTotal(order)
+    const shipping = await this.totalsService_.getShippingTotal(order)
+    const revenue = total - tax
+
+    let coupon
+    if (order.discounts && order.discounts.length) {
+      coupon = order.discounts[0].code
+    }
+
+    const orderData = {
+      checkout_id: order.cart_id,
+      order_id: order._id,
+      email: order.email,
+      reporting_total: await this.getReportingValue(order.currency_code, total),
+      reporting_subtotal: await this.getReportingValue(order.currency_code, subtotal),
+      reporting_revenue: await this.getReportingValue(order.currency_code, revenue),
+      reporting_shipping: await this.getReportingValue(order.currency_code, shipping),
+      reporting_tax: await this.getReportingValue(order.currency_code, tax),
+      reporting_discount: await this.getReportingValue(order.currency_code, discount),
+      total,
+      subtotal,
+      revenue,
+      shipping,
+      tax,
+      discount,
+      coupon,
+      currency: order.currency_code,
+      products: await Promise.all(
+        order.items.map(async item => {
+          let name = item.title
+          let variant = item.description
+
+          const unit_price = item.content.unit_price
+          const line_total = unit_price * item.content.quantity * item.quantity
+          const revenue = await this.getReportingValue(order.currency_code, line_total)
+          return {
+            name,
+            variant,
+            price: unit_price,
+            reporting_revenue: revenue,
+            product_id: `${item.content.product._id}`,
+            sku: item.content.variant.sku,
+            quantity: item.quantity,
+          }
+        })
+      ),
+    }
+
+
+    return orderData
+  }
+}
+
+export default SegmentService

packages/medusa-plugin-segment/src/subscribers/order.js

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+class OrderSubscriber {
+  constructor({ segmentService, eventBusService }) {
+    eventBusService.subscribe("order.placed", async (order) => {
+      const date = new Date(parseInt(order.created))
+      const orderData = await segmentService.buildOrder(order)
+      const orderEvent = {
+        event: "Order Completed",
+        userId: order.customer_id,
+        properties: orderData,
+        timestamp: date,
+      }
+
+      segmentService.track(orderEvent)
+    })
+  }
+}
+
+export default OrderSubscriber