re-add rss feeds

app/routes/threads.py

@@ -1,8 +1,10 @@
-from flask import Blueprint, redirect, url_for, render_template, request, abort
+from flask import Blueprint, redirect, url_for, render_template, request, abort, current_app
 from functools import wraps
+from app import cache
 from ..auth import login_required, get_active_user, is_logged_in
 from ..db import db
 from ..models import Threads, Posts, Topics, Users, Reactions, Subscriptions
+from ..lib.render_atom import render_atom_template
 from ..util import get_form_checkbox, time_now
 import math
 
@@ -70,9 +72,23 @@ def thread(thread_id, slug):
         posts=posts, page=page,
         page_count=page_count, topic=topic,
         started_by=started_by, topics=Topics.get_list(),
-        Reactions=Reactions, last_post=last_post
+        Reactions=Reactions, last_post=last_post,
+        __feedlink=url_for('.feed', thread_id=thread_id, _external=True),
+        __feedtitle=f'replies to {thread.title}',
         )
 
+@bp.get('/<int:thread_id>/feed.atom/')
+@cache.cached(timeout=5 * 60, unless=lambda: current_app.config['DEBUG'])
+def feed(thread_id):
+    thread = Threads.find({'id': thread_id})
+    if not thread:
+        abort(404)
+
+    topic = Topics.find({'id': thread.topic_id})
+    posts = thread.get_posts_rss()
+
+    return render_atom_template('threads/thread.atom', thread=thread, topic=topic, posts=posts)
+
 @bp.post('/<int:thread_id>/')
 @login_required
 def reply(thread_id):
@@ -195,10 +211,6 @@ def mark_read():
 
     return redirect(url_for('users.inbox', username=user.username))
 
-@bp.get('/<int:thread_id>/feed.atom/')
-def feed(thread_id):
-    return 'stub'
-
 @bp.get('/new/')
 @login_required
 def new():