Add sort fields to rss.

- #348

ui/src/components/community.tsx

@@ -175,7 +175,10 @@ export class Community extends Component<any, State> {
       <div class="mb-2">
         <SortSelect sort={this.state.sort} onChange={this.handleSortChange} />
         <a
-          href={`${document.location.origin}/feeds/c/${this.state.communityName}.xml`}
+          href={`/feeds/c/${this.state.communityName}.xml?sort=${
+            SortType[this.state.sort]
+          }`}
+          target="_blank"
         >
           <svg class="icon mx-2 text-muted small">
             <use xlinkHref="#icon-rss">#</use>

ui/src/components/main.tsx

@@ -435,7 +435,10 @@ export class Main extends Component<any, MainState> {
           <SortSelect sort={this.state.sort} onChange={this.handleSortChange} />
         </span>
         {this.state.type_ == ListingType.All && (
-          <a href={`${document.location.origin}/feeds/all.xml`}>
+          <a
+            href={`/feeds/all.xml?sort=${SortType[this.state.sort]}`}
+            target="_blank"
+          >
             <svg class="icon mx-1 text-muted small">
               <use xlinkHref="#icon-rss">#</use>
             </svg>

ui/src/components/user.tsx

@@ -250,7 +250,10 @@ export class User extends Component<any, UserState> {
           />
         </span>
         <a
-          href={`${document.location.origin}/feeds/u/${this.state.username}.xml`}
+          href={`/feeds/u/${this.state.username}.xml?sort=${
+            SortType[this.state.sort]
+          }`}
+          target="_blank"
         >
           <svg class="icon mx-2 text-muted small">
             <use xlinkHref="#icon-rss">#</use>