feat: populate and send link tag/header respectively for activitypub-enabled content

src/controllers/accounts/profile.js

@@ -4,6 +4,7 @@ const nconf = require('nconf');
 const _ = require('lodash');
 
 const db = require('../../database');
+const meta = require('../../meta');
 const user = require('../../user');
 const posts = require('../../posts');
 const categories = require('../../categories');
@@ -53,7 +54,12 @@ profileController.get = async function (req, res, next) {
 		userData.profileviews = 1;
 	}
 
-	addMetaTags(res, userData);
+	addTags(res, userData);
+
+	if (meta.config.activitypubEnabled) {
+		// Include link header for richer parsing
+		res.set('Link', `<${nconf.get('url')}/uid/${userData.uid}>; rel="alternate"; type="application/activity+json"`);
+	}
 
 	res.render('account/profile', userData);
 };
@@ -124,7 +130,7 @@ async function getPosts(callerUid, userData, setSuffix) {
 	return postData.slice(0, count);
 }
 
-function addMetaTags(res, userData) {
+function addTags(res, userData) {
 	const plainAboutMe = userData.aboutme ? utils.stripHTMLTags(utils.decodeHTMLEntities(userData.aboutme)) : '';
 	res.locals.metaTags = [
 		{
@@ -161,4 +167,12 @@ function addMetaTags(res, userData) {
 			}
 		);
 	}
+
+	if (meta.config.activitypubEnabled) {
+		res.locals.linkTags = [{
+			rel: 'alternate',
+			type: 'application/activity+json',
+			href: `${nconf.get('url')}/uid/${userData.uid}`,
+		}];
+	}
 }

src/controllers/category.js

@@ -158,6 +158,11 @@ categoryController.get = async function (req, res, next) {
 
 	analytics.increment([`pageviews:byCid:${categoryData.cid}`]);
 
+	if (meta.config.activitypubEnabled) {
+		// Include link header for richer parsing
+		res.set('Link', `<${nconf.get('url')}/actegory/${cid}>; rel="alternate"; type="application/activity+json"`);
+	}
+
 	res.render('category', categoryData);
 };
 
@@ -229,4 +234,12 @@ function addTags(categoryData, res, currentPage) {
 			href: categoryData.rssFeedUrl,
 		});
 	}
+
+	if (meta.config.activitypubEnabled) {
+		res.locals.linkTags.push({
+			rel: 'alternate',
+			type: 'application/activity+json',
+			href: `${nconf.get('url')}/actegory/${categoryData.cid}`,
+		});
+	}
 }

src/controllers/posts.js

@@ -1,7 +1,9 @@
 'use strict';
 
+const nconf = require('nconf');
 const querystring = require('querystring');
 
+const meta = require('../meta');
 const posts = require('../posts');
 const privileges = require('../privileges');
 const utils = require('../utils');
@@ -27,6 +29,11 @@ postsController.redirectToPost = async function (req, res, next) {
 		return helpers.notAllowed(req, res);
 	}
 
+	if (meta.config.activitypubEnabled) {
+		// Include link header for richer parsing
+		res.set('Link', `<${nconf.get('url')}/post/${req.params.pid}>; rel="alternate"; type="application/activity+json"`);
+	}
+
 	const qs = querystring.stringify(req.query);
 	helpers.redirect(res, qs ? `${path}?${qs}` : path, true);
 };

src/controllers/topics.js

@@ -133,6 +133,12 @@ topicsController.get = async function getTopic(req, res, next) {
 		rel.href = `${url}/topic/${topicData.slug}${rel.href}`;
 		res.locals.linkTags.push(rel);
 	});
+
+	if (meta.config.activitypubEnabled) {
+		// Include link header for richer parsing
+		res.set('Link', `<${nconf.get('url')}/topic/${tid}>; rel="alternate"; type="application/activity+json"`);
+	}
+
 	res.render('topic', topicData);
 };
 
@@ -284,6 +290,15 @@ async function addTags(topicData, req, res, currentPage) {
 			href: `${url}/user/${postAtIndex.user.userslug}`,
 		});
 	}
+
+	if (meta.config.activitypubEnabled) {
+		const { pid } = topicData.posts[topicData.postIndex - 1];
+		res.locals.linkTags.push({
+			rel: 'alternate',
+			type: 'application/activity+json',
+			href: utils.isNumber(pid) ? `${nconf.get('url')}/post/${pid}` : pid,
+		});
+	}
 }
 
 async function addOGImageTags(res, topicData, postAtIndex) {