Remove uuid dep, include a prefix in generated idempotency keys

lib/StripeResource.js

@@ -3,7 +3,6 @@
 const http = require('http');
 const https = require('https');
 const path = require('path');
-const uuid = require('uuid/v4');
 
 const utils = require('./utils');
 const Error = require('./Error');
@@ -265,7 +264,7 @@ StripeResource.prototype = {
   _defaultIdempotencyKey(method) {
     // If this is a POST and we allow multiple retries, ensure an idempotency key.
     if (method === 'POST' && this._stripe.getMaxNetworkRetries() > 0) {
-      return uuid();
+      return `stripe-node-retry-${utils.uuid4()}`;
     }
     return null;
   },

lib/utils.js

@@ -341,6 +341,17 @@ const utils = (module.exports = {
 
     return result;
   },
+
+  /**
+   * https://stackoverflow.com/a/2117523
+   */
+  uuid4: () => {
+    return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, (c) => {
+      const r = (Math.random() * 16) | 0;
+      const v = c === 'x' ? r : (r & 0x3) | 0x8;
+      return v.toString(16);
+    });
+  },
 });
 
 function emitWarning(warning) {

package.json

@@ -42,8 +42,7 @@
   },
   "dependencies": {
     "lodash.isplainobject": "^4.0.6",
-    "qs": "^6.6.0",
-    "uuid": "^3.3.2"
+    "qs": "^6.6.0"
   },
   "license": "MIT",
   "scripts": {

test/StripeResource.spec.js

@@ -1,7 +1,6 @@
 'use strict';
 
 const utils = require('../testUtils');
-const uuid = require('uuid/v4');
 
 const nock = require('nock');
 
@@ -357,7 +356,7 @@ describe('StripeResource', () => {
       });
 
       it('should reuse the given idempotency key provided for retries', (done) => {
-        const key = uuid();
+        const key = 'i-am-a-key';
         let headers;
 
         nock(`https://${options.host}`)