Merge pull request serverless#5481 from serverless/sls-5480

Create an HttpsProxyAgent for plugin list if necessary

lib/plugins/plugin/lib/utils.js

@@ -2,6 +2,8 @@
 
 const fetch = require('node-fetch');
 const BbPromise = require('bluebird');
+const HttpsProxyAgent = require('https-proxy-agent');
+const url = require('url');
 const path = require('path');
 const chalk = require('chalk');
 const _ = require('lodash');
@@ -49,7 +51,20 @@ module.exports = {
 
   getPlugins() {
     const endpoint = 'https://raw.githubusercontent.com/serverless/plugins/master/plugins.json';
-    return fetch(endpoint).then((result) => result.json()).then((json) => json);
+
+    // Use HTTPS Proxy (Optional)
+    const proxy = process.env.proxy
+      || process.env.HTTP_PROXY
+      || process.env.http_proxy
+      || process.env.HTTPS_PROXY
+      || process.env.https_proxy;
+
+    const options = {};
+    if (proxy) {
+      options.agent = new HttpsProxyAgent(url.parse(proxy));
+    }
+
+    return fetch(endpoint, options).then((result) => result.json()).then((json) => json);
   },
 
   display(plugins) {