Adds ip lookup middleware for cart creation

packages/medusa-plugin-ip-lookup/.babelrc

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

packages/medusa-plugin-ip-lookup/.gitignore

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+dist/
+node_modules/
+.DS_store
+.env*
+/*.js
+!index.js
+yarn.lock
+yarn-error.log
+
+/api
+/services
+/models
+/subscribers
+

packages/medusa-plugin-ip-lookup/.prettierrc

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

packages/medusa-plugin-ip-lookup/package.json

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+{
+  "name": "medusa-plugin-ip-lookup",
+  "version": "1.0.0-alpha.3",
+  "description": "IP lookup middleware for Medusa core",
+  "main": "dist/index.js",
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/medusajs/medusa",
+    "directory": "packages/medusa-plugin-ip-lookup"
+  },
+  "scripts": {
+    "build": "babel src --out-dir . --ignore **/__tests__",
+    "prepare": "cross-env NODE_ENV=production npm run build",
+    "watch": "babel -w src --out-dir . --ignore **/__tests__",
+    "test": "jest"
+  },
+  "author": "Oliver Juhl",
+  "license": "AGPL-3.0-or-later",
+  "devDependencies": {
+    "@babel/cli": "^7.7.5",
+    "@babel/core": "^7.7.5",
+    "@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/runtime": "^7.7.6",
+    "cross-env": "^5.2.1",
+    "jest": "^25.5.2"
+  },
+  "dependencies": {
+    "axios": "^0.20.0",
+    "mongoose": "^5.8.0"
+  },
+  "gitHead": "3cc7cbe5124cbcbb75f6e1435db4dcfaa2a60408"
+}

packages/medusa-plugin-ip-lookup/src/api/medusa-middleware.js

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+export default {
+  preCartCreation: async function (req, res, next) {
+    try {
+      if (req.body.region_id) {
+        next()
+        return
+      }
+
+      const ipLookupService = req.scope.resolve("ipLookupService")
+      const regionService = req.scope.resolve("regionService")
+
+      const ip = req.headers["x-forwarded-for"] || req.connection.remoteAddress
+
+      const { data } = await ipLookupService.lookupIp(ip)
+
+      if (!data.country_code) {
+        next()
+        return
+      }
+
+      // Find region using the country code from ip lookup
+      const regions = await regionService.list({
+        countries: data.country_code,
+      })
+
+      // If this region exists, add it to the body of the cart creation request
+      if (regions[0]) {
+        req.body.region_id = regions[0]._id.toString()
+      }
+
+      next()
+    } catch (error) {
+      next()
+    }
+  },
+}

packages/medusa-plugin-ip-lookup/src/services/ip-lookup.js

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+import { BaseService } from "medusa-interfaces"
+import axios from "axios"
+
+class IpLookupService extends BaseService {
+  constructor({}, options) {
+    super()
+
+    this.options_ = options
+  }
+
+  async lookupIp(ipAddress) {
+    return axios.get(
+      `http://api.ipstack.com/${ipAddress}?access_key=${this.options_.access_token}`
+    )
+  }
+}
+
+export default IpLookupService