Add google+ support

README.md

@@ -10,6 +10,7 @@ This library allows you to asynchronous load multiple social media client API's
 Supports the following APIs:
 
 * Facebook
+* Google+
 * Tumblr
 * Twitter
 * Instagram

rollup.config.js

@@ -2,7 +2,7 @@ import typescript from 'rollup-plugin-typescript2';
 import resolve from 'rollup-plugin-node-resolve';
 import commonjs from 'rollup-plugin-commonjs';
 
-const filenames = ['facebook', 'instagram', 'tumblr', 'twitter', 'vine', 'index'];
+const filenames = ['facebook', 'instagram', 'tumblr', 'twitter', 'vine', 'google/plus', 'index'];
 
 export default {
     input: `src/index.ts`,

src/google/plus.ts

@@ -0,0 +1,31 @@
+import BaseApi from '../base-api';
+
+declare global {
+    interface Window {
+        googlePlusOnLoadCallback: any;
+    }
+}
+
+export default class GooglePlus extends BaseApi {
+    private gapi?: any;
+
+    static get id() {
+        return 'google-plus';
+    }
+
+    protected async handleLoadApi(): Promise<any> {
+        return new Promise(async (resolve, reject) => {
+            window.googlePlusOnLoadCallback = () => {
+                gapi.load('auth2', () => {
+                    this.gapi = gapi;
+                    resolve(gapi);
+                });
+            };
+            try {
+                await this.loadScript('https://apis.google.com/js/platform.js?onload=googlePlusOnLoadCallback');
+            } catch (e) {
+                reject(e);
+            }
+        });
+    }
+}

src/index.ts

@@ -3,5 +3,6 @@ import Instagram from './instagram';
 import Tumblr from './tumblr';
 import Twitter from './twitter';
 import Vine from './vine';
+import GooglePlus from './google/plus';
 
-export { Facebook, Instagram, Tumblr, Twitter, Vine };
+export { Facebook, Instagram, Tumblr, Twitter, Vine, GooglePlus };