Change privacy policy to be rendered in web UI, add REST API (#19310)

Source string no longer localized, Markdown instead of raw HTML

app/javascript/mastodon/features/privacy_policy/index.js

@@ -0,0 +1,60 @@
+import React from 'react';
+import PropTypes from 'prop-types';
+import { title } from 'mastodon/initial_state';
+import { Helmet } from 'react-helmet';
+import { FormattedMessage, FormattedDate, injectIntl, defineMessages } from 'react-intl';
+import Column from 'mastodon/components/column';
+import api from 'mastodon/api';
+import Skeleton from 'mastodon/components/skeleton';
+
+const messages = defineMessages({
+  title: { id: 'privacy_policy.title', defaultMessage: 'Privacy Policy' },
+});
+
+export default @injectIntl
+class PrivacyPolicy extends React.PureComponent {
+
+  static propTypes = {
+    intl: PropTypes.object,
+  };
+
+  state = {
+    content: null,
+    lastUpdated: null,
+    isLoading: true,
+  };
+
+  componentDidMount () {
+    api().get('/api/v1/instance/privacy_policy').then(({ data }) => {
+      this.setState({ content: data.content, lastUpdated: data.updated_at, isLoading: false });
+    }).catch(() => {
+      this.setState({ isLoading: false });
+    });
+  }
+
+  render () {
+    const { intl } = this.props;
+    const { isLoading, content, lastUpdated } = this.state;
+
+    return (
+      <Column>
+        <div className='scrollable privacy-policy'>
+          <div className='column-title'>
+            <h3><FormattedMessage id='privacy_policy.title' defaultMessage='Privacy Policy' /></h3>
+            <p><FormattedMessage id='privacy_policy.last_updated' defaultMessage='Last updated {date}' values={{ date: isLoading ? <Skeleton width='10ch' /> : <FormattedDate value={lastUpdated} year='numeric' month='short' day='2-digit' /> }} /></p>
+          </div>
+
+          <div
+            className='privacy-policy__body'
+            dangerouslySetInnerHTML={{ __html: content }}
+          />
+        </div>
+
+        <Helmet>
+          <title>{intl.formatMessage(messages.title)} - {title}</title>
+        </Helmet>
+      </Column>
+    );
+  }
+
+}