Show media modal on public pages (#6801)

app/javascript/mastodon/containers/media_galleries_container.js

@@ -0,0 +1,68 @@
+import React from 'react';
+import ReactDOM from 'react-dom';
+import PropTypes from 'prop-types';
+import { IntlProvider, addLocaleData } from 'react-intl';
+import { getLocale } from '../locales';
+import MediaGallery from '../components/media_gallery';
+import ModalRoot from '../components/modal_root';
+import MediaModal from '../features/ui/components/media_modal';
+import { fromJS } from 'immutable';
+
+const { localeData, messages } = getLocale();
+addLocaleData(localeData);
+
+export default class MediaGalleriesContainer extends React.PureComponent {
+
+  static propTypes = {
+    locale: PropTypes.string.isRequired,
+    galleries: PropTypes.object.isRequired,
+  };
+
+  state = {
+    media: null,
+    index: null,
+  };
+
+  handleOpenMedia = (media, index) => {
+    document.body.classList.add('media-gallery-standalone__body');
+    this.setState({ media, index });
+  }
+
+  handleCloseMedia = () => {
+    document.body.classList.remove('media-gallery-standalone__body');
+    this.setState({ media: null, index: null });
+  }
+
+  render () {
+    const { locale, galleries } = this.props;
+
+    return (
+      <IntlProvider locale={locale} messages={messages}>
+        <React.Fragment>
+          {[].map.call(galleries, gallery => {
+            const { media, ...props } = JSON.parse(gallery.getAttribute('data-props'));
+
+            return ReactDOM.createPortal(
+              <MediaGallery
+                {...props}
+                media={fromJS(media)}
+                onOpenMedia={this.handleOpenMedia}
+              />,
+              gallery
+            );
+          })}
+          <ModalRoot onClose={this.handleCloseMedia}>
+            {this.state.media === null || this.state.index === null ? null : (
+              <MediaModal
+                media={this.state.media}
+                index={this.state.index}
+                onClose={this.handleCloseMedia}
+              />
+            )}
+          </ModalRoot>
+        </React.Fragment>
+      </IntlProvider>
+    );
+  }
+
+}