Use canonical URLs (#1883)

src/shared/components/common/html-tags.tsx

@@ -8,6 +8,7 @@ import { I18NextService } from "../../services";
 interface HtmlTagsProps {
   title: string;
   path: string;
+  canonicalPath?: string;
   description?: string;
   image?: string;
 }
@@ -16,6 +17,8 @@ interface HtmlTagsProps {
 export class HtmlTags extends Component<HtmlTagsProps, any> {
   render() {
     const url = httpExternalPath(this.props.path);
+    const canonicalUrl =
+      this.props.canonicalPath ?? httpExternalPath(this.props.path);
     const desc = this.props.description;
     const image = this.props.image;
 
@@ -30,6 +33,8 @@ export class HtmlTags extends Component<HtmlTagsProps, any> {
           <meta key={u} property={u} content={url} />
         ))}
 
+        <link rel="canonical" href={canonicalUrl} />
+
         {/* Open Graph / Facebook */}
         <meta property="og:type" content="website" />
 

src/shared/components/community/community.tsx

@@ -312,6 +312,7 @@ export class Community extends Component<
             <HtmlTags
               title={this.documentTitle}
               path={this.context.router.route.match.url}
+              canonicalPath={res.community_view.community.actor_id}
               description={res.community_view.community.description}
               image={res.community_view.community.icon}
             />

src/shared/components/person/profile.tsx

@@ -324,6 +324,7 @@ export class Profile extends Component<
               <HtmlTags
                 title={this.documentTitle}
                 path={this.context.router.route.match.url}
+                canonicalPath={personRes.person_view.person.actor_id}
                 description={personRes.person_view.person.bio}
                 image={personRes.person_view.person.avatar}
               />

src/shared/components/post/post.tsx

@@ -353,6 +353,7 @@ export class Post extends Component<any, PostState> {
               <HtmlTags
                 title={this.documentTitle}
                 path={this.context.router.route.match.url}
+                canonicalPath={res.post_view.post.ap_id}
                 image={this.imageTag}
                 description={res.post_view.post.body}
               />

src/shared/components/search.tsx

@@ -466,6 +466,10 @@ export class Search extends Component<any, SearchState> {
         <HtmlTags
           title={this.documentTitle}
           path={this.context.router.route.match.url}
+          canonicalPath={
+            this.context.router.route.match.url +
+            this.context.router.route.location.search
+          }
         />
         <h1 className="h4 mb-4">{I18NextService.i18n.t("search")}</h1>
         {this.selects}