yii\authclient\GoogleSignInButton created

extensions/authclient/widgets/GoogleSignInButton.php

@@ -0,0 +1,150 @@
+<?php
+/**
+ * @link http://www.yiiframework.com/
+ * @copyright Copyright (c) 2008 Yii Software LLC
+ * @license http://www.yiiframework.com/license/
+ */
+
+namespace yii\authclient\widgets;
+
+use yii\authclient\clients\GoogleOAuth;
+use yii\base\InvalidConfigException;
+use yii\base\Widget;
+use yii\helpers\Html;
+use yii\helpers\Url;
+use yii\web\View;
+
+/**
+ * GoogleSignInButton renders Google+ sign-in button.
+ * This widget is designed to interact with [[GoogleOAuth]].
+ *
+ * @see GoogleOAuth
+ * @see https://developers.google.com/+/web/signin/
+ *
+ * @property string|array $callback
+ *
+ * @author Paul Klimov <klimov.paul@gmail.com>
+ * @since 2.0
+ */
+class GoogleSignInButton extends Widget
+{
+    /**
+     * @var GoogleOAuth google auth client instance.
+     */
+    public $client;
+    /**
+     * @var array button tag HTML options, which will be merged with the default ones.
+     */
+    public $buttonHtmlOptions = [];
+
+    /**
+     * @var string|array name of the JavaScript function, which should be used as sign-in callback.
+     * If blank default one will be generated: it will redirect page to the auth action using auth result
+     * as GET parameters.
+     * You may pass an array configuration of the URL here, which
+     * will be used creating default callback.
+     */
+    private $_callback;
+
+    /**
+     * @param string $callback
+     */
+    public function setCallback($callback)
+    {
+        $this->_callback = $callback;
+    }
+
+    /**
+     * @return string
+     */
+    public function getCallback()
+    {
+        if (empty($this->_callback)) {
+            $this->_callback = $this->generateCallback();
+        } elseif (is_array($this->_callback)) {
+            $this->_callback = $this->generateCallback($this->_callback);
+        }
+        return $this->_callback;
+    }
+
+    /**
+     * Initializes the widget.
+     */
+    public function init()
+    {
+        if (!($this->client instanceof GoogleOAuth)) {
+            throw new InvalidConfigException('"' . $this->className() . '::client" must be instance of "' . GoogleOAuth::className() . '"');
+        }
+    }
+
+    /**
+     * Runs the widget.
+     */
+    public function run()
+    {
+        $this->registerClientScript();
+        return $this->renderButton();
+    }
+
+    protected function generateCallback($url = null)
+    {
+        if (empty($url)) {
+            $url = ['auth', 'authclient' => $this->client->id];
+        }
+        $url = Url::to($url);
+        if (strpos($url, '?') === false) {
+            $url .= '?';
+        } else {
+            $url .= '&';
+        }
+
+        $callbackName = 'googleSignInCallback' . md5($this->id);
+        $js = <<<JS
+function $callbackName(authResult) {
+    var urlParams = [];
+    for (var propName in authResult) {
+        urlParams.push(encodeURIComponent(propName) + '=' + encodeURIComponent(authResult[propName]));
+    }
+    window.location = '$url' + urlParams.join('&');
+}
+JS;
+        $this->view->registerJs($js, View::POS_END, __CLASS__ . '#' . $this->id);
+
+        return $callbackName;
+    }
+
+    /**
+     * Registers necessary JavaScript.
+     */
+    protected function registerClientScript()
+    {
+        $js = <<<JS
+(function() {
+    var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true;
+    po.src = 'https://apis.google.com/js/client:plusone.js';
+    var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s);
+})();
+JS;
+        $this->view->registerJs($js, View::POS_END, __CLASS__);
+    }
+
+    /**
+     * Renders sign-in button.
+     * @return string button HTML.
+     */
+    protected function renderButton()
+    {
+        $buttonHtmlOptions = array_merge(
+            [
+                'class' => 'g-signin',
+                'data-callback' => $this->getCallback(),
+                'data-clientid' => $this->client->clientId,
+                'data-cookiepolicy' => 'single_host_origin',
+                'data-requestvisibleactions' => null,
+                'data-scope' => $this->client->scope,
+            ],
+            $this->buttonHtmlOptions
+        );
+        return Html::tag('span', Html::tag('span', '', $buttonHtmlOptions), ['id' => 'signinButton']);
+    }
+}