Add effective date to terms of service (#33993)

app/javascript/mastodon/features/terms_of_service/index.tsx

@@ -8,26 +8,31 @@ import {
 } from 'react-intl';
 
 import { Helmet } from 'react-helmet';
+import { Link, useParams } from 'react-router-dom';
 
 import { apiGetTermsOfService } from 'mastodon/api/instance';
 import type { ApiTermsOfServiceJSON } from 'mastodon/api_types/instance';
 import { Column } from 'mastodon/components/column';
-import { Skeleton } from 'mastodon/components/skeleton';
 import BundleColumnError from 'mastodon/features/ui/components/bundle_column_error';
 
 const messages = defineMessages({
   title: { id: 'terms_of_service.title', defaultMessage: 'Terms of Service' },
 });
 
+interface Params {
+  date?: string;
+}
+
 const TermsOfService: React.FC<{
   multiColumn: boolean;
 }> = ({ multiColumn }) => {
   const intl = useIntl();
+  const { date } = useParams<Params>();
   const [response, setResponse] = useState<ApiTermsOfServiceJSON>();
   const [loading, setLoading] = useState(true);
 
   useEffect(() => {
-    apiGetTermsOfService()
+    apiGetTermsOfService(date)
       .then((data) => {
         setResponse(data);
         setLoading(false);
@@ -36,7 +41,7 @@ const TermsOfService: React.FC<{
       .catch(() => {
         setLoading(false);
       });
-  }, []);
+  }, [date]);
 
   if (!loading && !response) {
     return <BundleColumnError multiColumn={multiColumn} errorType='routing' />;
@@ -55,23 +60,60 @@ const TermsOfService: React.FC<{
               defaultMessage='Terms of Service'
             />
           </h3>
-          <p>
-            <FormattedMessage
-              id='privacy_policy.last_updated'
-              defaultMessage='Last updated {date}'
-              values={{
-                date: loading ? (
-                  <Skeleton width='10ch' />
-                ) : (
-                  <FormattedDate
-                    value={response?.updated_at}
-                    year='numeric'
-                    month='short'
-                    day='2-digit'
+          <p className='prose'>
+            {response?.effective ? (
+              <FormattedMessage
+                id='privacy_policy.last_updated'
+                defaultMessage='Last updated {date}'
+                values={{
+                  date: (
+                    <FormattedDate
+                      value={response.effective_date}
+                      year='numeric'
+                      month='short'
+                      day='2-digit'
+                    />
+                  ),
+                }}
+              />
+            ) : (
+              <FormattedMessage
+                id='terms_of_service.effective_as_of'
+                defaultMessage='Effective as of {date}'
+                values={{
+                  date: (
+                    <FormattedDate
+                      value={response?.effective_date}
+                      year='numeric'
+                      month='short'
+                      day='2-digit'
+                    />
+                  ),
+                }}
+              />
+            )}
+
+            {response?.succeeded_by && (
+              <>
+                {' · '}
+                <Link to={`/terms-of-service/${response.succeeded_by}`}>
+                  <FormattedMessage
+                    id='terms_of_service.upcoming_changes_on'
+                    defaultMessage='Upcoming changes on {date}'
+                    values={{
+                      date: (
+                        <FormattedDate
+                          value={response.succeeded_by}
+                          year='numeric'
+                          month='short'
+                          day='2-digit'
+                        />
+                      ),
+                    }}
                   />
-                ),
-              }}
-            />
+                </Link>
+              </>
+            )}
           </p>
         </div>