Add Facebook Share button

js/app.js

@@ -30,6 +30,7 @@ import GoogleAnalyticsHandler from './third_party/ga';
 import RavenHandler from './third_party/raven';
 import IntercomHandler from './third_party/intercom';
 import NotificationsHandler from './third_party/notifications';
+import FacebookHandler from './third_party/facebook';
 /* eslint-enable */
 
 initLogging();

js/components/ascribe_detail/media_container.js

@@ -7,6 +7,8 @@ import Glyphicon from 'react-bootstrap/lib/Glyphicon';
 
 import MediaPlayer from './../ascribe_media/media_player';
 
+import FacebookShareButton from '../ascribe_social_share/facebook_share_button';
+
 import CollapsibleButton from './../ascribe_collapsible/collapsible_button';
 
 import AclProxy from '../acl_proxy';
@@ -95,6 +97,7 @@ let MediaContainer = React.createClass({
                             Download <Glyphicon glyph="cloud-download"/>
                         </Button>
                     </AclProxy>
+                    <FacebookShareButton />
                     {embed}
                 </p>
             </div>

js/components/ascribe_social_share/facebook_share_button.js

@@ -0,0 +1,52 @@
+'use strict';
+
+import React from 'react';
+
+import AppConstants from '../../constants/application_constants';
+
+import { InjectInHeadUtils } from '../../utils/inject_utils';
+
+let FacebookShareButton = React.createClass({
+    propTypes: {
+        url: React.PropTypes.string,
+        type: React.PropTypes.string
+    },
+
+    getDefaultProps() {
+        return {
+            type: 'button'
+        };
+    },
+
+    componentDidMount() {
+        /**
+         * Ideally we would only use FB.XFBML.parse() on the component that we're
+         * mounting, but doing this when we first load the FB sdk causes unpredictable behaviour.
+         * The button sometimes doesn't get initialized, likely because FB hasn't properly
+         * been initialized yet.
+         *
+         * To circumvent this, we always have the sdk parse the entire DOM on the initial load
+         * (see FacebookHandler) and then use FB.XFBML.parse() on the mounting component later.
+         */
+        if (!InjectInHeadUtils.isPresent('script', AppConstants.facebook.sdkUrl)) {
+            InjectInHeadUtils.inject(AppConstants.facebook.sdkUrl);
+        } else {
+            // Parse() searches the children of the element we give it, not the element itself.
+            FB.XFBML.parse(this.refs.fbShareButton.getDOMNode().parentElement);
+        }
+    },
+
+    render() {
+        return (
+            <span
+                ref="fbShareButton"
+                style={{width: '56px', height: '24px'}}
+                className="fb-share-button btn btn-xs"
+                data-href={this.props.url}
+                data-layout={this.props.type}>
+           </span>
+        );
+    }
+});
+
+export default FacebookShareButton;

js/constants/application_constants.js

@@ -75,6 +75,10 @@ let constants = {
     'raven': {
         'url': 'https://0955da3388c64ab29bd32c2a429f9ef4@app.getsentry.com/48351'
     },
+    'facebook': {
+        'appId': '420813844732240',
+        'sdkUrl': '//connect.facebook.net/en_US/sdk.js'
+    },
     'copyrightAssociations': ['ARS', 'DACS', 'Bildkunst', 'Pictoright', 'SODRAC', 'Copyright Agency/Viscopy', 'SAVA',
         'Bildrecht GmbH', 'SABAM', 'AUTVIS', 'CREAIMAGEN', 'SONECA', 'Copydan', 'EAU', 'Kuvasto', 'GCA', 'HUNGART',
         'IVARO', 'SIAE', 'JASPAR-SPDA', 'AKKA/LAA', 'LATGA-A', 'SOMAAP', 'ARTEGESTION', 'CARIER', 'BONO', 'APSAV',

js/third_party/facebook.js

@@ -0,0 +1,30 @@
+'use strict';
+
+import { altThirdParty } from '../alt';
+import EventActions from '../actions/event_actions';
+
+import AppConstants from '../constants/application_constants'
+
+class FacebookHandler {
+    constructor() {
+        this.bindActions(EventActions);
+    }
+
+    onApplicationWillBoot(settings) {
+        // Callback function that FB's sdk will call when it's finished loading
+        // See https://developers.facebook.com/docs/javascript/quickstart/v2.5
+        window.fbAsyncInit = () => {
+            FB.init({
+                appId: AppConstants.facebook.appId,
+                // Force FB to parse everything on first load to make sure all the XFBML components are initialized.
+                // If we don't do this, we can run into issues with components on the first load who are not be
+                // initialized.
+                xfbml: true,
+                version: 'v2.5',
+                cookie: false
+            });
+        };
+    }
+}
+
+export default altThirdParty.createStore(FacebookHandler, 'FacebookHandler');