From 6ee41578d6bd1a226921b48e9ac9e16d6d25717c Mon Sep 17 00:00:00 2001
From: freamon <adslater@gmail.com>
Date: Fri, 17 Jan 2025 17:24:26 +0000
Subject: [PATCH] mentions in post bodies - use shared code for outbound
 federation / notification

---
 app/activitypub/util.py |  14 --
 app/community/routes.py | 300 +---------------------------------------
 app/community/util.py   | 227 ------------------------------
 app/post/routes.py      | 216 ++---------------------------
 4 files changed, 21 insertions(+), 736 deletions(-)

diff --git a/app/activitypub/util.py b/app/activitypub/util.py
index fd94c34b..898a509c 100644
--- a/app/activitypub/util.py
+++ b/app/activitypub/util.py
@@ -2569,21 +2569,7 @@ def verify_object_from_source(request_json):
     return request_json
 
 
-# This is for followers on microblog apps
-# Used to let them know a Poll has been updated with a new vote
-# The plan is to also use it for activities on local user's posts that aren't understood by being Announced (anything beyond the initial Create)
-# This would need for posts to have things like a 'Replies' collection and a 'Likes' collection, so these can be downloaded when the post updates
-# Using collecions like this (as PeerTube does) circumvents the problem of not having a remote user's private key.
-# The problem of what to do for remote user's activity on a remote user's post in a local community still exists (can't Announce it, can't inform of post update)
 def inform_followers_of_post_update(post_id: int, sending_instance_id: int):
-    if current_app.debug:
-        inform_followers_of_post_update_task(post_id, sending_instance_id)
-    else:
-        inform_followers_of_post_update_task.delay(post_id, sending_instance_id)
-
-
-@celery.task
-def inform_followers_of_post_update_task(post_id: int, sending_instance_id: int):
     post = Post.query.get(post_id)
     page_json = post_to_page(post)
     page_json['updated'] = ap_datetime(utcnow())
diff --git a/app/community/routes.py b/app/community/routes.py
index d5e61031..319a469a 100644
--- a/app/community/routes.py
+++ b/app/community/routes.py
@@ -24,7 +24,7 @@ from app.community.forms import SearchRemoteCommunity, CreateDiscussionForm, Cre
     EscalateReportForm, ResolveReportForm, CreateVideoForm, CreatePollForm, RetrieveRemotePost, \
     EditCommunityWikiPageForm
 from app.community.util import search_for_community, actor_to_community, \
-    save_post, save_icon_file, save_banner_file, send_to_remote_instance, \
+    save_icon_file, save_banner_file, send_to_remote_instance, \
     delete_post_from_community, delete_post_reply_from_community, community_in_list, find_local_users, tags_from_string, \
     allowed_extensions, end_poll_date
 from app.constants import SUBSCRIPTION_MEMBER, SUBSCRIPTION_OWNER, POST_TYPE_LINK, POST_TYPE_ARTICLE, POST_TYPE_IMAGE, \
@@ -43,6 +43,7 @@ from app.utils import get_setting, render_template, allowlist_html, markdown_to_
     community_moderators, communities_banned_from, show_ban_message, recently_upvoted_posts, recently_downvoted_posts, \
     blocked_users, languages_for_form, menu_topics, add_to_modlog, \
     blocked_communities, remove_tracking_from_link, piefed_markdown_to_lemmy_markdown, ensure_directory_exists
+from app.shared.post import make_post
 from feedgen.feed import FeedGenerator
 from datetime import timezone, timedelta
 from copy import copy
@@ -630,110 +631,15 @@ def add_post(actor, type):
 
     form.language_id.choices = languages_for_form()
 
-    if not can_create_post(current_user, community):
-        abort(401)
-
     if form.validate_on_submit():
         community = Community.query.get_or_404(form.communities.data)
-        if not can_create_post(current_user, community):
+        try:
+            uploaded_file = request.files['image_file'] if type == 'image' else None
+            post = make_post(form, community, post_type, 1, uploaded_file=uploaded_file)
+        except Exception as ex:
+            flash(_('Your post was not accepted because %(reason)s', reason=str(ex)), 'error')
             abort(401)
 
-        language = Language.query.get(form.language_id.data)
-
-        request_json = {
-            'id': None,
-            'object': {
-                'name': form.title.data,
-                'type': 'Page',
-                'stickied': form.sticky.data,
-                'sensitive': form.nsfw.data,
-                'nsfl': form.nsfl.data,
-                'id': gibberish(),   # this will  be updated once we have the post.id
-                'mediaType': 'text/markdown',
-                'content': form.body.data,
-                'tag': tags_from_string(form.tags.data),
-                'language': {'identifier': language.code, 'name': language.name}
-            }
-        }
-        if type == 'link':
-            request_json['object']['attachment'] = [{'type': 'Link', 'href': form.link_url.data}]
-        elif type == 'image':
-            uploaded_file = request.files['image_file']
-            if uploaded_file and uploaded_file.filename != '':
-                # check if this is an allowed type of file
-                file_ext = os.path.splitext(uploaded_file.filename)[1]
-                if file_ext.lower() not in allowed_extensions:
-                    abort(400, description="Invalid image type.")
-
-                new_filename = gibberish(15)
-                # set up the storage directory
-                directory = 'app/static/media/posts/' + new_filename[0:2] + '/' + new_filename[2:4]
-                ensure_directory_exists(directory)
-
-                final_place = os.path.join(directory, new_filename + file_ext)
-                uploaded_file.seek(0)
-                uploaded_file.save(final_place)
-
-                if file_ext.lower() == '.heic':
-                    register_heif_opener()
-                if file_ext.lower() == '.avif':
-                    import pillow_avif
-
-                Image.MAX_IMAGE_PIXELS = 89478485
-
-                # resize if necessary
-                if not final_place.endswith('.svg'):
-                    img = Image.open(final_place)
-                    if '.' + img.format.lower() in allowed_extensions:
-                        img = ImageOps.exif_transpose(img)
-
-                        # limit full sized version to 2000px
-                        img.thumbnail((2000, 2000))
-                        img.save(final_place)
-
-                request_json['object']['attachment'] = [{
-                    'type': 'Image', 
-                    'url': f'https://{current_app.config["SERVER_NAME"]}/{final_place.replace("app/", "")}',
-                    'name': form.image_alt_text.data,
-                    'file_path': final_place
-                }]
-        
-        elif type == 'video':
-            request_json['object']['attachment'] = [{'type': 'Document', 'url': form.video_url.data}]
-        elif type == 'poll':
-            request_json['object']['type'] = 'Question'
-            choices = [form.choice_1, form.choice_2, form.choice_3, form.choice_4, form.choice_5,
-                       form.choice_6, form.choice_7, form.choice_8, form.choice_9, form.choice_10]
-            key = 'oneOf' if form.mode.data == 'single' else 'anyOf'
-            request_json['object'][key] = []
-            for choice in choices:
-                choice_data = choice.data.strip()
-                if choice_data:
-                    request_json['object'][key].append({'name': choice_data})
-            request_json['object']['endTime'] = end_poll_date(form.finish_in.data)
-
-        # todo: add try..except
-        post = Post.new(current_user, community, request_json)
-
-        if form.notify_author.data:
-            new_notification = NotificationSubscription(name=post.title, user_id=current_user.id, entity_id=post.id, type=NOTIF_POST)
-            db.session.add(new_notification)
-        current_user.language_id = form.language_id.data
-        g.site.last_active = utcnow()
-        post.ap_id = f"https://{current_app.config['SERVER_NAME']}/post/{post.id}"
-        db.session.commit()
-
-        if post.type == POST_TYPE_POLL:
-            poll = Poll.query.filter_by(post_id=post.id).first()
-            if not poll.local_only:
-                federate_post_to_user_followers(post)
-            if not community.local_only and not poll.local_only:
-                federate_post(community, post)
-        else:
-            federate_post_to_user_followers(post)
-            if not community.local_only:
-                federate_post(community, post)
-
         resp = make_response(redirect(f"/post/{post.id}"))
         # remove cookies used to maintain state when switching post type
         resp.delete_cookie('post_title')
@@ -760,7 +666,6 @@ def add_post(actor, type):
             form.language_id.data = source_post.language_id
             form.link_url.data = source_post.url
 
-    
     # empty post to pass since add_post.html extends edit_post.html 
     # and that one checks for a post.image_id for editing image posts
     post = None
@@ -775,197 +680,6 @@ def add_post(actor, type):
     )
 
 
-def federate_post(community, post):
-    page = {
-        'type': 'Page',
-        'id': post.ap_id,
-        'attributedTo': current_user.public_url(),
-        'to': [
-            community.public_url(),
-            'https://www.w3.org/ns/activitystreams#Public'
-        ],
-        'name': post.title,
-        'cc': [],
-        'content': post.body_html if post.body_html else '',
-        'mediaType': 'text/html',
-        'source': {'content': post.body if post.body else '', 'mediaType': 'text/markdown'},
-        'attachment': [],
-        'commentsEnabled': post.comments_enabled,
-        'sensitive': post.nsfw,
-        'nsfl': post.nsfl,
-        'stickied': post.sticky,
-        'published': ap_datetime(utcnow()),
-        'audience': community.public_url(),
-        'language': {
-            'identifier': post.language_code(),
-            'name': post.language_name()
-        },
-        'tag': post.tags_for_activitypub()
-    }
-    create = {
-        "id": f"https://{current_app.config['SERVER_NAME']}/activities/create/{gibberish(15)}",
-        "actor": current_user.public_url(),
-        "to": [
-            "https://www.w3.org/ns/activitystreams#Public"
-        ],
-        "cc": [
-            community.public_url()
-        ],
-        "type": "Create",
-        "audience": community.public_url(),
-        "object": page,
-        '@context': default_context()
-    }
-    if post.type == POST_TYPE_LINK or post.type == POST_TYPE_VIDEO:
-        page['attachment'] = [{'href': post.url, 'type': 'Link'}]
-    elif post.image_id:
-        image_url = ''
-        if post.image.source_url:
-            image_url = post.image.source_url
-        elif post.image.file_path:
-            image_url = post.image.file_path.replace('app/static/',
-                                                     f"https://{current_app.config['SERVER_NAME']}/static/")
-        elif post.image.thumbnail_path:
-            image_url = post.image.thumbnail_path.replace('app/static/',
-                                                          f"https://{current_app.config['SERVER_NAME']}/static/")
-        # NB image is a dict while attachment is a list of dicts (usually just one dict in the list)
-        page['image'] = {'type': 'Image', 'url': image_url}
-        if post.type == POST_TYPE_IMAGE:
-            page['attachment'] = [{'type': 'Image',
-                                   'url': post.image.source_url,  # source_url is always a https link, no need for .replace() as done above
-                                   'name': post.image.alt_text}]
-
-    if post.type == POST_TYPE_POLL:
-        poll = Poll.query.filter_by(post_id=post.id).first()
-        page['type'] = 'Question'
-        page['endTime'] = ap_datetime(poll.end_poll)
-        page['votersCount'] = 0
-        choices = []
-        for choice in PollChoice.query.filter_by(post_id=post.id).all():
-            choices.append({
-                "type": "Note",
-                "name": choice.choice_text,
-                "replies": {
-                  "type": "Collection",
-                  "totalItems": 0
-                }
-            })
-        page['oneOf' if poll.mode == 'single' else 'anyOf'] = choices
-    if not community.is_local():  # this is a remote community - send the post to the instance that hosts it
-        post_request_in_background(community.ap_inbox_url, create, current_user.private_key,
-                               current_user.public_url() + '#main-key', timeout=10)
-        flash(_('Your post to %(name)s has been made.', name=community.title))
-    else:  # local community - send (announce) post out to followers
-        announce = {
-            "id": f"https://{current_app.config['SERVER_NAME']}/activities/announce/{gibberish(15)}",
-            "type": 'Announce',
-            "to": [
-                "https://www.w3.org/ns/activitystreams#Public"
-            ],
-            "actor": community.public_url(),
-            "cc": [
-                community.ap_followers_url
-            ],
-            '@context': default_context(),
-            'object': create
-        }
-        microblog_announce = copy(announce)
-        microblog_announce['object'] = post.ap_id
-
-        sent_to = 0
-        for instance in community.following_instances():
-            if instance.inbox and not current_user.has_blocked_instance(instance.id) and not instance_banned(
-                    instance.domain):
-                if instance.software in MICROBLOG_APPS:
-                    send_to_remote_instance(instance.id, community.id, microblog_announce)
-                else:
-                    send_to_remote_instance(instance.id, community.id, announce)
-                sent_to += 1
-        if sent_to:
-            flash(_('Your post to %(name)s has been made.', name=community.title))
-        else:
-            flash(_('Your post to %(name)s has been made.', name=community.title))
-
-
-def federate_post_to_user_followers(post):
-    followers = UserFollower.query.filter_by(local_user_id=post.user_id)
-    if not followers:
-        return
-
-    note = {
-        'type': 'Note',
-        'id': post.ap_id,
-        'inReplyTo': None,
-        'attributedTo': current_user.public_url(),
-        'to': [
-            'https://www.w3.org/ns/activitystreams#Public'
-        ],
-        'cc': [
-            current_user.followers_url()
-        ],
-        'content': '',
-        'mediaType': 'text/html',
-        'attachment': [],
-        'commentsEnabled': post.comments_enabled,
-        'sensitive': post.nsfw,
-        'nsfl': post.nsfl,
-        'stickied': post.sticky,
-        'published': ap_datetime(utcnow()),
-        'language': {
-            'identifier': post.language_code(),
-            'name': post.language_name()
-        },
-        'tag': post.tags_for_activitypub()
-    }
-    create = {
-        "id": f"https://{current_app.config['SERVER_NAME']}/activities/create/{gibberish(15)}",
-        "actor": current_user.public_url(),
-        "to": [
-            "https://www.w3.org/ns/activitystreams#Public"
-        ],
-        "cc": [
-            current_user.followers_url()
-        ],
-        "type": "Create",
-        "object": note,
-        '@context': default_context()
-    }
-    if post.type == POST_TYPE_ARTICLE:
-        note['content'] = '<p>' + post.title + '</p>'
-    elif post.type == POST_TYPE_LINK or post.type == POST_TYPE_VIDEO:
-        note['content'] = '<p><a href=' + post.url + '>' + post.title + '</a></p>'
-    elif post.type == POST_TYPE_IMAGE:
-        note['content'] = '<p>' + post.title + '</p>'
-        if post.image_id and post.image.source_url:
-            note['attachment'] = [{'type': 'Image', 'url': post.image.source_url, 'name': post.image.alt_text}]
-
-    if post.body_html:
-        note['content'] = note['content'] + '<p>' + post.body_html + '</p>'
-
-    if post.type == POST_TYPE_POLL:
-        poll = Poll.query.filter_by(post_id=post.id).first()
-        note['type'] = 'Question'
-        note['endTime'] = ap_datetime(poll.end_poll)
-        note['votersCount'] = 0
-        choices = []
-        for choice in PollChoice.query.filter_by(post_id=post.id).all():
-            choices.append({
-                "type": "Note",
-                "name": choice.choice_text,
-                "replies": {
-                  "type": "Collection",
-                  "totalItems": 0
-                }
-            })
-        note['oneOf' if poll.mode == 'single' else 'anyOf'] = choices
-
-    instances = Instance.query.join(User, User.instance_id == Instance.id).join(UserFollower, UserFollower.remote_user_id == User.id)
-    instances = instances.filter(UserFollower.local_user_id == post.user_id).filter(Instance.gone_forever == False)
-    for instance in instances:
-        if instance.inbox and not current_user.has_blocked_instance(instance.id) and not instance_banned(instance.domain):
-            post_request_in_background(instance.inbox, create, current_user.private_key, current_user.public_url() + '#main-key')
-
-
 @bp.route('/community/<int:community_id>/report', methods=['GET', 'POST'])
 @login_required
 def community_report(community_id: int):
diff --git a/app/community/util.py b/app/community/util.py
index 186f59e9..11f54780 100644
--- a/app/community/util.py
+++ b/app/community/util.py
@@ -235,233 +235,6 @@ def actor_to_community(actor) -> Community:
     return community
 
 
-def save_post(form, post: Post, type: int):
-    post.indexable = current_user.indexable
-    post.sticky = form.sticky.data
-    post.nsfw = form.nsfw.data
-    post.nsfl = form.nsfl.data
-    post.notify_author = form.notify_author.data
-    post.language_id = form.language_id.data
-    current_user.language_id = form.language_id.data
-    post.title = form.title.data.strip()
-    post.body = piefed_markdown_to_lemmy_markdown(form.body.data)
-    post.body_html = markdown_to_html(post.body)
-    if not type or type == POST_TYPE_ARTICLE:
-        post.type = POST_TYPE_ARTICLE
-    elif type == POST_TYPE_LINK:
-        url_changed = post.id is None or form.link_url.data != post.url
-        post.url = remove_tracking_from_link(form.link_url.data.strip())
-        post.type = POST_TYPE_LINK
-        domain = domain_from_url(form.link_url.data)
-        domain.post_count += 1
-        post.domain = domain
-
-        if url_changed:
-            if post.image_id:
-                remove_old_file(post.image_id)
-                post.image_id = None
-
-            if post.url.endswith('.mp4') or post.url.endswith('.webm'):
-                post.type = POST_TYPE_VIDEO
-                file = File(source_url=form.link_url.data)  # make_image_sizes() will take care of turning this into a still image
-                post.image = file
-                db.session.add(file)
-            else:
-                unused, file_extension = os.path.splitext(form.link_url.data)
-                # this url is a link to an image - turn it into a image post
-                if file_extension.lower() in allowed_extensions:
-                    file = File(source_url=form.link_url.data)
-                    post.image = file
-                    db.session.add(file)
-                    post.type = POST_TYPE_IMAGE
-                else:
-                    # check opengraph tags on the page and make a thumbnail if an image is available in the og:image meta tag
-                    if not post.type == POST_TYPE_VIDEO:
-                        tn_url = form.link_url.data
-                        if tn_url[:32] == 'https://www.youtube.com/watch?v=':
-                            tn_url = 'https://youtu.be/' + tn_url[32:43]            # better chance of thumbnail from youtu.be than youtube.com
-                        opengraph = opengraph_parse(tn_url)
-                        if opengraph and (opengraph.get('og:image', '') != '' or opengraph.get('og:image:url', '') != ''):
-                            filename = opengraph.get('og:image') or opengraph.get('og:image:url')
-                            if not filename.startswith('/'):
-                                file = url_to_thumbnail_file(filename)
-                                if file:
-                                    file.alt_text = shorten_string(opengraph.get('og:title'), 295)
-                                    post.image = file
-                                    db.session.add(file)
-
-    elif type == POST_TYPE_IMAGE:
-        post.type = POST_TYPE_IMAGE
-        alt_text = form.image_alt_text.data if form.image_alt_text.data else form.title.data
-        uploaded_file = request.files['image_file']
-        # If we are uploading new file in the place of existing one just remove the old one
-        if post.image_id is not None and uploaded_file:
-            post.image.delete_from_disk()
-            image_id = post.image_id
-            post.image_id = None
-            db.session.add(post)
-            db.session.commit() 
-            File.query.filter_by(id=image_id).delete()
-        
-        if uploaded_file and uploaded_file.filename != '':
-            if post.image_id:
-                remove_old_file(post.image_id)
-                post.image_id = None
-
-            # check if this is an allowed type of file
-            file_ext = os.path.splitext(uploaded_file.filename)[1]
-            if file_ext.lower() not in allowed_extensions:
-                abort(400)
-            new_filename = gibberish(15)
-
-            # set up the storage directory
-            directory = 'app/static/media/posts/' + new_filename[0:2] + '/' + new_filename[2:4]
-            ensure_directory_exists(directory)
-
-            # save the file
-            final_place = os.path.join(directory, new_filename + file_ext)
-            final_place_medium = os.path.join(directory, new_filename + '_medium.webp')
-            final_place_thumbnail = os.path.join(directory, new_filename + '_thumbnail.webp')
-            uploaded_file.seek(0)
-            uploaded_file.save(final_place)
-
-            if file_ext.lower() == '.heic':
-                register_heif_opener()
-
-            Image.MAX_IMAGE_PIXELS = 89478485
-
-            # resize if necessary
-            img = Image.open(final_place)
-            if '.' + img.format.lower() in allowed_extensions:
-                img = ImageOps.exif_transpose(img)
-
-                # limit full sized version to 2000px
-                img_width = img.width
-                img_height = img.height
-                img.thumbnail((2000, 2000))
-                img.save(final_place)
-
-                # medium sized version
-                img.thumbnail((512, 512))
-                img.save(final_place_medium, format="WebP", quality=93)
-
-                # save a third, smaller, version as a thumbnail
-                img.thumbnail((170, 170))
-                img.save(final_place_thumbnail, format="WebP", quality=93)
-                thumbnail_width = img.width
-                thumbnail_height = img.height
-
-                file = File(file_path=final_place_medium, file_name=new_filename + file_ext, alt_text=alt_text,
-                            width=img_width, height=img_height, thumbnail_width=thumbnail_width,
-                            thumbnail_height=thumbnail_height, thumbnail_path=final_place_thumbnail,
-                            source_url=final_place.replace('app/static/', f"https://{current_app.config['SERVER_NAME']}/static/"))
-                db.session.add(file)
-                db.session.commit()
-                post.image_id = file.id
-
-    elif type == POST_TYPE_VIDEO:
-        form.video_url.data = form.video_url.data.strip()
-        url_changed = post.id is None or form.video_url.data != post.url
-        post.url = remove_tracking_from_link(form.video_url.data.strip())
-        post.type = POST_TYPE_VIDEO
-        domain = domain_from_url(form.video_url.data)
-        domain.post_count += 1
-        post.domain = domain
-
-        if url_changed:
-            if post.image_id:
-                remove_old_file(post.image_id)
-                post.image_id = None
-            if form.video_url.data.endswith('.mp4') or form.video_url.data.endswith('.webm'):
-                file = File(source_url=form.video_url.data)  # make_image_sizes() will take care of turning this into a still image
-                post.image = file
-                db.session.add(file)
-            else:
-                # check opengraph tags on the page and make a thumbnail if an image is available in the og:image meta tag
-                tn_url = form.video_url.data
-                if tn_url[:32] == 'https://www.youtube.com/watch?v=':
-                    tn_url = 'https://youtu.be/' + tn_url[32:43]  # better chance of thumbnail from youtu.be than youtube.com
-                opengraph = opengraph_parse(tn_url)
-                if opengraph and (opengraph.get('og:image', '') != '' or opengraph.get('og:image:url', '') != ''):
-                    filename = opengraph.get('og:image') or opengraph.get('og:image:url')
-                    if not filename.startswith('/'):
-                        file = url_to_thumbnail_file(filename)
-                        if file:
-                            file.alt_text = shorten_string(opengraph.get('og:title'), 295)
-                            post.image = file
-                            db.session.add(file)
-
-    elif type == POST_TYPE_POLL:
-        post.body = form.title.data + '\n' + form.body.data if post.title not in form.body.data else form.body.data
-        post.body_html = markdown_to_html(post.body)
-        post.type = POST_TYPE_POLL
-    else:
-        raise Exception('invalid post type')
-
-    if post.id is None:
-        if current_user.reputation > 100:
-            post.up_votes = 1
-            post.score = 1
-        if current_user.reputation < -100:
-            post.score = -1
-        post.ranking = post.post_ranking(post.score, utcnow())
-
-        # Filter by phrase
-        blocked_phrases_list = blocked_phrases()
-        for blocked_phrase in blocked_phrases_list:
-            if blocked_phrase in post.title:
-                abort(401)
-                return
-        if post.body:
-            for blocked_phrase in blocked_phrases_list:
-                if blocked_phrase in post.body:
-                    abort(401)
-                    return
-
-        db.session.add(post)
-    else:
-        db.session.execute(text('DELETE FROM "post_tag" WHERE post_id = :post_id'), {'post_id': post.id})
-    post.tags = tags_from_string_old(form.tags.data)
-    db.session.commit()
-
-    # Save poll choices. NB this will delete all votes whenever a poll is edited. Partially because it's easier to code but also to stop malicious alterations to polls after people have already voted
-    if type == POST_TYPE_POLL:
-        db.session.execute(text('DELETE FROM "poll_choice_vote" WHERE post_id = :post_id'), {'post_id': post.id})
-        db.session.execute(text('DELETE FROM "poll_choice" WHERE post_id = :post_id'), {'post_id': post.id})
-        for i in range(1, 10):
-            choice_data = getattr(form, f"choice_{i}").data.strip()
-            if choice_data != '':
-                db.session.add(PollChoice(post_id=post.id, choice_text=choice_data, sort_order=i))
-
-        poll = Poll.query.filter_by(post_id=post.id).first()
-        if poll is None:
-            poll = Poll(post_id=post.id)
-            db.session.add(poll)
-        poll.mode = form.mode.data
-        if form.finish_in:
-            poll.end_poll = end_poll_date(form.finish_in.data)
-        poll.local_only = form.local_only.data
-        poll.latest_vote = None
-        db.session.commit()
-
-    # Notify author about replies
-    # Remove any subscription that currently exists
-    existing_notification = NotificationSubscription.query.filter(NotificationSubscription.entity_id == post.id,
-                                                                  NotificationSubscription.user_id == current_user.id,
-                                                                  NotificationSubscription.type == NOTIF_POST).first()
-    if existing_notification:
-        db.session.delete(existing_notification)
-
-    # Add subscription if necessary
-    if form.notify_author.data:
-        new_notification = NotificationSubscription(name=post.title, user_id=current_user.id, entity_id=post.id,
-                                                    type=NOTIF_POST)
-        db.session.add(new_notification)
-
-    g.site.last_active = utcnow()
-    db.session.commit()
-
-
 def end_poll_date(end_choice):
     delta_mapping = {
         '30m': timedelta(minutes=30),
diff --git a/app/post/routes.py b/app/post/routes.py
index dee6a2b9..089b4a25 100644
--- a/app/post/routes.py
+++ b/app/post/routes.py
@@ -10,8 +10,8 @@ from wtforms import SelectField, RadioField
 
 from app import db, constants, cache, celery
 from app.activitypub.signature import HttpSignature, post_request, default_context, post_request_in_background
-from app.activitypub.util import notify_about_post_reply, inform_followers_of_post_update, update_post_from_activity
-from app.community.util import save_post, send_to_remote_instance
+from app.activitypub.util import notify_about_post_reply, update_post_from_activity
+from app.community.util import send_to_remote_instance
 from app.inoculation import inoculation
 from app.post.forms import NewReplyForm, ReportPostForm, MeaCulpaForm, CrossPostForm
 from app.community.forms import CreateLinkForm, CreateImageForm, CreateDiscussionForm, CreateVideoForm, CreatePollForm, EditImageForm
@@ -35,6 +35,7 @@ from app.utils import get_setting, render_template, allowlist_html, markdown_to_
     languages_for_form, menu_topics, add_to_modlog, blocked_communities, piefed_markdown_to_lemmy_markdown, \
     permission_required, blocked_users, get_request, is_local_image_url, is_video_url, can_upvote, can_downvote
 from app.shared.reply import make_reply, edit_reply
+from app.shared.post import edit_post
 
 
 def show_post(post_id: int):
@@ -359,7 +360,8 @@ def poll_vote(post_id):
         poll_votes = PollChoice.query.join(PollChoiceVote, PollChoiceVote.choice_id == PollChoice.id).filter(PollChoiceVote.post_id == post.id, PollChoiceVote.user_id == current_user.id).all()
         for pv in poll_votes:
             if post.author.is_local():
-                inform_followers_of_post_update(post.id, 1)
+                from app.shared.tasks import task_selector
+                task_selector('edit_post', user_id=current_user.id, post_id=post.id)
             else:
                 pollvote_json = {
                   '@context': default_context(),
@@ -587,7 +589,7 @@ def post_edit(post_id: int):
         del form.finish_in
     else:
         abort(404)
-    
+
     del form.communities
 
     mods = post.community.moderators()
@@ -607,26 +609,16 @@ def post_edit(post_id: int):
             form.nsfl.data = True
             form.nsfw.render_kw = {'disabled': True}
 
-        old_url = post.url
-
         form.language_id.choices = languages_for_form()
 
         if form.validate_on_submit():
-            save_post(form, post, post_type)
-            post.community.last_active = utcnow()
-            post.edited_at = utcnow()
-
-            if post.url != old_url:
-                post.calculate_cross_posts(url_changed=True)
-
-            db.session.commit()
-
-            flash(_('Your changes have been saved.'), 'success')
-
-            # federate edit
-            if not post.community.local_only:
-                federate_post_update(post)
-            federate_post_edit_to_user_followers(post)
+            try:
+                uploaded_file = request.files['image_file'] if post_type == POST_TYPE_IMAGE else None
+                edit_post(form, post, post_type, 1, uploaded_file=uploaded_file)
+                flash(_('Your changes have been saved.'), 'success')
+            except Exception as ex:
+                flash(_('Your edit was not accepted because %(reason)s', reason=str(ex)), 'error')
+                abort(401)
 
             return redirect(url_for('activitypub.post_ap', post_id=post.id))
         else:
@@ -651,7 +643,7 @@ def post_edit(post_id: int):
                     )
                 with open(path, "rb")as file:
                     form.image_file.data = file.read()
-            
+
             elif post_type == POST_TYPE_VIDEO:
                 form.video_url.data = post.url
             elif post_type == POST_TYPE_POLL:
@@ -678,186 +670,6 @@ def post_edit(post_id: int):
         abort(401)
 
 
-def federate_post_update(post):
-    page_json = {
-        'type': 'Page',
-        'id': post.ap_id,
-        'attributedTo': current_user.public_url(),
-        'to': [
-            post.community.public_url(),
-            'https://www.w3.org/ns/activitystreams#Public'
-        ],
-        'name': post.title,
-        'cc': [],
-        'content': post.body_html if post.body_html else '',
-        'mediaType': 'text/html',
-        'source': {'content': post.body if post.body else '', 'mediaType': 'text/markdown'},
-        'attachment': [],
-        'commentsEnabled': post.comments_enabled,
-        'sensitive': post.nsfw,
-        'nsfl': post.nsfl,
-        'stickied': post.sticky,
-        'published': ap_datetime(post.posted_at),
-        'updated': ap_datetime(post.edited_at),
-        'audience': post.community.public_url(),
-        'language': {
-            'identifier': post.language_code(),
-            'name': post.language_name()
-        },
-        'tag': post.tags_for_activitypub()
-    }
-    update_json = {
-        'id': f"https://{current_app.config['SERVER_NAME']}/activities/update/{gibberish(15)}",
-        'type': 'Update',
-        'actor': current_user.public_url(),
-        'audience': post.community.public_url(),
-        'to': [post.community.public_url(), 'https://www.w3.org/ns/activitystreams#Public'],
-        'published': ap_datetime(utcnow()),
-        'cc': [
-            current_user.followers_url()
-        ],
-        'object': page_json,
-    }
-    if post.type == POST_TYPE_LINK or post.type == POST_TYPE_VIDEO:
-        page_json['attachment'] = [{'href': post.url, 'type': 'Link'}]
-    elif post.image_id:
-        if post.image.file_path:
-            image_url = post.image.file_path.replace('app/static/',
-                                                     f"https://{current_app.config['SERVER_NAME']}/static/")
-        elif post.image.thumbnail_path:
-            image_url = post.image.thumbnail_path.replace('app/static/',
-                                                          f"https://{current_app.config['SERVER_NAME']}/static/")
-        else:
-            image_url = post.image.source_url
-        # NB image is a dict while attachment is a list of dicts (usually just one dict in the list)
-        page_json['image'] = {'type': 'Image', 'url': image_url}
-        if post.type == POST_TYPE_IMAGE:
-            page_json['attachment'] = [{'type': 'Image',
-                                        'url': post.image.source_url,  # source_url is always a https link, no need for .replace() as done above
-                                        'name': post.image.alt_text}]
-    if post.type == POST_TYPE_POLL:
-        poll = Poll.query.filter_by(post_id=post.id).first()
-        page_json['type'] = 'Question'
-        page_json['endTime'] = ap_datetime(poll.end_poll)
-        page_json['votersCount'] = 0
-        choices = []
-        for choice in PollChoice.query.filter_by(post_id=post.id).all():
-            choices.append({
-                "type": "Note",
-                "name": choice.choice_text,
-                "replies": {
-                  "type": "Collection",
-                  "totalItems": 0
-                }
-            })
-        page_json['oneOf' if poll.mode == 'single' else 'anyOf'] = choices
-
-    if not post.community.is_local():  # this is a remote community, send it to the instance that hosts it
-        success = post_request(post.community.ap_inbox_url, update_json, current_user.private_key,
-                               current_user.public_url() + '#main-key')
-        if success is False or isinstance(success, str):
-            flash('Failed to send edit to remote server', 'error')
-    else:  # local community - send it to followers on remote instances
-        announce = {
-            "id": f"https://{current_app.config['SERVER_NAME']}/activities/announce/{gibberish(15)}",
-            "type": 'Announce',
-            "to": [
-                "https://www.w3.org/ns/activitystreams#Public"
-            ],
-            "actor": post.community.ap_profile_id,
-            "cc": [
-                post.community.ap_followers_url
-            ],
-            '@context': default_context(),
-            'object': update_json
-        }
-
-        for instance in post.community.following_instances():
-            if instance.inbox and not current_user.has_blocked_instance(instance.id) and not instance_banned(
-                    instance.domain):
-                send_to_remote_instance(instance.id, post.community.id, announce)
-
-
-def federate_post_edit_to_user_followers(post):
-    followers = UserFollower.query.filter_by(local_user_id=post.user_id)
-    if not followers:
-        return
-
-    note = {
-        'type': 'Note',
-        'id': post.ap_id,
-        'inReplyTo': None,
-        'attributedTo': current_user.public_url(),
-        'to': [
-            'https://www.w3.org/ns/activitystreams#Public'
-        ],
-        'cc': [
-            current_user.followers_url()
-        ],
-        'content': '',
-        'mediaType': 'text/html',
-        'source': {'content': post.body if post.body else '', 'mediaType': 'text/markdown'},
-        'attachment': [],
-        'commentsEnabled': post.comments_enabled,
-        'sensitive': post.nsfw,
-        'nsfl': post.nsfl,
-        'stickied': post.sticky,
-        'published': ap_datetime(utcnow()),
-        'updated': ap_datetime(post.edited_at),
-        'language': {
-            'identifier': post.language_code(),
-            'name': post.language_name()
-        },
-        'tag': post.tags_for_activitypub()
-    }
-    update = {
-        "id": f"https://{current_app.config['SERVER_NAME']}/activities/create/{gibberish(15)}",
-        "actor": current_user.public_url(),
-        "to": [
-            "https://www.w3.org/ns/activitystreams#Public"
-        ],
-        "cc": [
-            current_user.followers_url()
-        ],
-        "type": "Update",
-        "object": note,
-        '@context': default_context()
-    }
-    if post.type == POST_TYPE_ARTICLE:
-        note['content'] = '<p>' + post.title + '</p>'
-    elif post.type == POST_TYPE_LINK or post.type == POST_TYPE_VIDEO:
-        note['content'] = '<p><a href=' + post.url + '>' + post.title + '</a></p>'
-    elif post.type == POST_TYPE_IMAGE:
-        note['content'] = '<p>' + post.title + '</p>'
-        if post.image_id and post.image.source_url:
-            note['attachment'] = [{'type': 'Image', 'url': post.image.source_url, 'name': post.image.alt_text}]
-    elif post.type == POST_TYPE_POLL:
-        poll = Poll.query.filter_by(post_id=post.id).first()
-        note['type'] = 'Question'
-        note['endTime'] = ap_datetime(poll.end_poll)
-        note['votersCount'] = 0
-        choices = []
-        for choice in PollChoice.query.filter_by(post_id=post.id).all():
-            choices.append({
-                "type": "Note",
-                "name": choice.choice_text,
-                "replies": {
-                    "type": "Collection",
-                    "totalItems": 0
-                }
-            })
-        note['oneOf' if poll.mode == 'single' else 'anyOf'] = choices
-
-    if post.body_html:
-        note['content'] = note['content'] + '<p>' + post.body_html + '</p>'
-
-    instances = Instance.query.join(User, User.instance_id == Instance.id).join(UserFollower, UserFollower.remote_user_id == User.id)
-    instances = instances.filter(UserFollower.local_user_id == post.user_id)
-    for instance in instances:
-        if instance.inbox and not instance_banned(instance.domain):
-            post_request_in_background(instance.inbox, update, current_user.private_key, current_user.public_url() + '#main-key')
-
-
 @bp.route('/post/<int:post_id>/delete', methods=['GET', 'POST'])
 @login_required
 def post_delete(post_id: int):