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ActivityPub

ActivityPub

Per Automattic
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Descripció

Enter the fediverse with ActivityPub, broadcasting your blog to a wider audience! Attract followers, deliver updates, and receive comments from a diverse user base of ActivityPub-compliant platforms.

With the ActivityPub plugin installed, your WordPress blog itself function as a federated profile, along with profiles for each author. For instance, if your website is example.com, then the blog-wide profile can be found at @example.com@example.com, and authors like Jane and Bob would have their individual profiles at @jane@example.com and @bobz@example.com, respectively.

An example: I give you my Mastodon profile name: @pfefferle@mastodon.social. You search, see my profile, and hit follow. Now, any post I make appears in your Home feed. Similarly, with the ActivityPub plugin, you can find and follow Jane’s profile at @jane@example.com.

Once you follow Jane’s @jane@example.com profile, any blog post she crafts on example.com will land in your Home feed. Simultaneously, by following the blog-wide profile @example.com@example.com, you’ll receive updates from all authors.

Note: If no one follows your author or blog instance, your posts remain unseen. The simplest method to verify the plugin’s operation is by following your profile. If you possess a Mastodon profile, initiate by following your new one.

The plugin works with the following tested federated platforms, but there may be more that it works with as well:

Some things to note:

  1. The blog-wide profile is only compatible with sites with rewrite rules enabled. If your site does not have rewrite rules enabled, the author-specific profiles may still work.
  2. Many single-author blogs have chosen to turn off or redirect their author profile pages, usually via an SEO plugin like Yoast or Rank Math. This is usually done to avoid duplicate content with your blog’s home page. If your author page has been deactivated in this way, then ActivityPub author profiles won’t work for you. Instead, you can turn your author profile page back on, and then use the option in your SEO plugin to noindex the author page. This will still resolve duplicate content issues with search engines and will enable ActivityPub author profiles to work.
  3. Once ActivityPub is installed, only new posts going forward will be available in the fediverse. Likewise, even if you’ve been using ActivityPub for a while, anyone who follows your site will only see new posts you publish from that moment on. They will never see previously-published posts in their Home feed. This process is very similar to subscribing to a newsletter. If you subscribe to a newsletter, you will only receive future emails, but not the old archived ones. With ActivityPub, if someone follows your site, they will only receive new blog posts you publish from then on.

So what’s the process?

  1. Install the ActivityPub plugin.
  2. Go to the plugin’s settings page and adjust the settings to your liking. Click the Save button when ready.
  3. Make sure your blog’s author profile page is active if you are using author profiles.
  4. Go to Mastodon or any other federated platform, and search for your profile, and follow it. Your new profile will be in the form of either @your_username@example.com or @example.com@example.com, so that is what you’ll search for.
  5. On your blog, publish a new post.
  6. From Mastodon, check to see if the new post appears in your Home feed.

Note: It may take up to 15 minutes or so for the new post to show up in your federated feed. This is because the messages are sent to the federated platforms using a delayed cron. This avoids breaking the publishing process for those cases where users might have lots of followers. So please don’t assume that just because you didn’t see it show up right away that something is broken. Give it some time. In most cases, it will show up within a few minutes, and you’ll know everything is working as expected.

Captures

  • The “Follow me”-Block in the Block-Editor
  • The “Followers”-Block in the Block-Editor
  • The “Federated Reply”-Block in the Block-Editor
  • A “Federated Reply” in a Post
  • A Blog-Profile on Mastodon

Blocs

Aquesta extensió proporciona 4 blocs.

  • Federated Reply Respond to posts, notes, videos, and other content on the fediverse. Ensure the URL originates from a federated social network like Mastodon, as other URLs might not function as expected.
  • Follow me on the Fediverse Display your Fediverse profile so that visitors can follow you.
  • Fediverse Reactions Display Fediverse likes and reposts
  • Fediverse Followers Display your followers from the Fediverse on your website.

Instal·lació

Seguiu les instruccions habituals per instal·lar extensions del WordPress.

Instal·lació automàtica de l’extensió

Per afegir una extensió de WordPress mitjançant l’instal·lador d’extensions integrat:

  1. Aneu a Extensions > Afegeix nova.
  2. Escriviu «activitypub» al quadre Cerca extensions.
  3. Cerqueu l’extensió de WordPress que voleu instal·lar.
    1. Feu clic a Detalls per obtenir més informació sobre l’extensió i les instruccions que podeu imprimir o desar per ajudar a configurar l’extensió.
    2. Feu clic a Instal·la ara per instal·lar l’extensió de WordPress.
  4. La pantalla d’instal·lació resultant mostrarà la instal·lació com a correcta o avisarà de qualsevol problema durant la instal·lació.
  5. En cas d’èxit, feu clic a Activa l’extensió per activar-la o a Torna a l’instal·lador d’extensions per a més accions.

Instal·lació manual de l’extensió

Hi ha alguns casos en què és adequat instal·lar manualment una extensió del WordPress.

  • Si voleu controlar la ubicació i el procés d’instal·lació d’una extensió de WordPress.
  • Si el vostre servidor no permet la instal·lació automàtica d’una extensió de WordPress.
  • Si voleu provar la última versió en desenvolupament.

La instal·lació manual d’una extensió de WordPress requereix familiaritat amb FTP i la consciència que podeu posar en perill el vostre lloc web si instal·leu una extensió de WordPress incompatible amb la versió actual o d’una font poc fiable.

Feu una còpia de seguretat completa del vostre lloc web abans de continuar.

Per instal·lar un extensió del WordPress manualment:

  • Download your WordPress Plugin to your desktop.
  • Si la baixeu com a arxiu zip, extraieu la carpeta de l’extensió al vostre escriptori.
  • Amb el vostre programa FTP, pengeu la carpeta de l’extensió a la carpeta wp-content/plugins del vostre directori del WordPress en línia.
  • Aneu a la pantalla d’extensions i cerqueu a la llista l’extensió penjada recentment.
  • Feu clic a Activa per activar-la.

PMF

tl;dr

This plugin connects your WordPress blog to popular social platforms like Mastodon, making your posts more accessible to a wider audience. Once installed, your blog can be followed by users on these platforms, allowing them to receive your new posts in their feeds.

Què és «ActivityPub for WordPress»

ActivityPub for WordPress amplia el WordPress amb algunes característiques del Fedivers, però no competeix amb plataformes com Friendica o Mastodon. Si voleu executar una xarxa social descentralitzada, utilitzeu Mastodon o GNU social.

Què passa si esteu executant el vostre blog en un subdirectori?

Perquè WebFinger funcioni, s’ha d’assignar al directori arrel de l’URL on resideix el vostre blog.

Apache

Afegiu el següent al fitxer .htaccess al directori arrel:

RedirectMatch "^\/\.well-known/(webfinger|nodeinfo)(.*)$" /blog/.well-known/$1$2

On «blog» és el camí al subdirectori on resideix el vostre blog.

Nginx

Afegiu el següent a site.conf a sites-available:

location ~* /.well-known {
    allow all;
    try_files $uri $uri/ /blog/?$args;
}

On «blog» és el camí al subdirectori on resideix el vostre blog.

If you are running your blog in a subdirectory, but have a different wp_siteurl, you don’t need the redirect, because the index.php will take care of that.

What if you are running your blog behind a reverse proxy with Apache?

If you are using a reverse proxy with Apache to run your host you may encounter that you are unable to have followers join the blog. This will occur because the proxy system rewrites the host headers to be the internal DNS name of your server, which the plugin then uses to attempt to sign the replies. The remote site attempting to follow your users is expecting the public DNS name on the replies. In these cases you will need to use the ‘ProxyPreserveHost On’ directive to ensure the external host name is passed to your internal host.

If you are using SSL between the proxy and internal host you may also need to SSLProxyCheckPeerName off if your internal host can not answer with the correct SSL name. This may present a security issue in some environments.

Constants

The plugin uses PHP Constants to enable, disable or change its default behaviour. Please use them with caution and only if you know what you are doing.

  • ACTIVITYPUB_REST_NAMESPACE – Change the default Namespace of the REST endpoint. Default: activitypub/1.0.
  • ACTIVITYPUB_EXCERPT_LENGTH – Change the length of the Excerpt. Default: 400.
  • ACTIVITYPUB_SHOW_PLUGIN_RECOMMENDATIONS – show plugin recommendations in the ActivityPub settings. Default: true.
  • ACTIVITYPUB_MAX_IMAGE_ATTACHMENTS – Change the number of attachments, that should be federated. Default: 3.
  • ACTIVITYPUB_HASHTAGS_REGEXP – Change the default regex to detect hashtext in a text. Default: (?:(?<=\s)|(?<=<p>)|(?<=<br>)|^)#([A-Za-z0-9_]+)(?:(?=\s|[[:punct:]]|$)).
  • ACTIVITYPUB_USERNAME_REGEXP – Change the default regex to detect @-replies in a text. Default: (?:([A-Za-z0-9\._-]+)@((?:[A-Za-z0-9_-]+\.)+[A-Za-z]+)).
  • ACTIVITYPUB_URL_REGEXP – Change the default regex to detect urls in a text. Default: (www.|http:|https:)+[^\s]+[\w\/].
  • ACTIVITYPUB_CUSTOM_POST_CONTENT – Change the default template for Activities. Default: <strong>[ap_title]</strong>\n\n[ap_content]\n\n[ap_hashtags]\n\n[ap_shortlink].
  • ACTIVITYPUB_AUTHORIZED_FETCH – Enable AUTHORIZED_FETCH.
  • ACTIVITYPUB_DISABLE_REWRITES – Disable auto generation of mod_rewrite rules. Default: false.
  • ACTIVITYPUB_DISABLE_INCOMING_INTERACTIONS – Block incoming replies/comments/likes. Default: false.
  • ACTIVITYPUB_DISABLE_OUTGOING_INTERACTIONS – Disable outgoing replies/comments/likes. Default: false.
  • ACTIVITYPUB_SHARED_INBOX_FEATURE – Enable the shared inbox. Default: false.
  • ACTIVITYPUB_SEND_VARY_HEADER – Enable to send the Vary: Accept header. Default: false.

Where can you manage your followers?

If you have activated the blog user, you will find the list of his followers in the settings under /wp-admin/options-general.php?page=activitypub&tab=followers.

The followers of a user can be found in the menu under “Users” -> “Followers” or under wp-admin/users.php?page=activitypub-followers-list.

For reasons of data protection, it is not possible to see the followers of other users.

Ressenyes

Connecting WordPress and Mastodon

6 de abril de 2025
Great Plugin: When I publish a post on WordPress, it also appears on Mastodon.Friendly Support: Thanks to Matthias Pfefferle, who answered my questions during installation and evaluation.

Excellent plugin which increases traffic and interaction

21 de febrer de 2025 1 resposta
I’ve been using the add-on for a few months. I’m really happy. I’ve gotten a lot more readers to my site and real comments from people compared to the previous state. It’s also been nice to see that the add-on is being developed all the time. I was so excited that I started translating the add-on into Finnish, so I can also contribute to this great add-on. Thank you!

(Almost) seamlessly connects your blog to the Fediverse.

15 de desembre de 2024
Not just an auto-poster – it it turns your WordPress blog into its own instance like a Mastodon server, so people can follow and reply to your blog directly from their Mastodon/GoToSocial/whatever account. Images are attached to the Fediverse view, and remote replies show up locally as comments. People can boost your post directly instead of just linking to it. And they’re still adding more capabilities with each release. Note that a lot of the settings aren’t in the plugin config page, they’re put in the relevant categories. Followers show up on your user profile. You ban an instance by putting it in the general comments blocklist. Works well with ClassicPress too.

Incredibly Powerful, a bit Complex, Solid Defaults

20 de setembre de 2024
The plugin works as described, providing a full ActivityPub integration from the moment you activate it. There are a lot of options, some of which require a bit of extra research to understand (I recommend watching the Fediverse Files series on YouTube), but the defaults are solid and in most situations you won’t want to change them.
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Col·laboradors i desenvolupadors

«ActivityPub» és programari de codi obert. La següent gent ha col·laborat en aquesta extensió.

Col·laboradors

“ActivityPub” s’ha traduït a 26 configuracions regionals. Gràcies als traductors per les seves aportacions.

Traduïu «ActivityPub» a la vostra llengua.

Interessats en el desenvolupament?

Navegueu pel codi, baixeu-vos el repositori SVN, o subscriviu-vos al registre de desenvolupament per fisl de subscripció RSS.

Registre de canvis

5.7.0 – 2025-04-11

Added

  • Advanced Settings tab, with special settings for advanced users.
  • Check if pretty permalinks are enabled and recommend to use threaded comments.
  • Reply block: show embeds where available.
  • Support same-server domain migrations.
  • Upgrade routine that removes any erroneously created extra field entries.

Changed

  • Add option to enable/disable the “shared inbox” to the “Advanced Settings”.
  • Add option to enable/disable the Vary Header to the “Advanced Settings”.
  • Configure the “Follow Me” button to have a button-only mode.
  • Importers are loaded on admin-specific hook.
  • Improve the troubleshooting UI and show Site-Health stats in ActivityPub settings.
  • Increased compatibility with Mobilizon and other platforms by improving signature verification for different key formats.

Fixed

  • Ensure that an Activity has an Actor before adding it to the Outbox.
  • Fixed some some bugs and added additional informations on the Debug tab of the Site-Health page.
  • Follow-up to the reply block changes that makes sure Mastodon embeds are displayed in the editor.
  • Outbox endpoint bug where non-numeric usernames caused errors when querying Outbox data.
  • Show Site Health error if site uses old “Almost Pretty Permalinks” structure.
  • Sites with comments from the Fediverse no longer create uncached extra fields posts that flood the Outbox.
  • Transformers allow settings values to false again, a regression from 5.5.0.

5.6.1 – 2025-04-02

Fixed

  • “Post Interactions” settings will now be saved to the options table.
  • So not show movedTo attribute instead of setting it to false if empty.
  • Use specified date format for updated field in Outbox-Activites.

5.6.0 – 2025-04-01

Added

  • Added a Mastodon importer to move your Mastodon posts to your WordPress site.
  • A default Extra-Field to do a little advertising for WordPress.
  • Move: Differentiate between internal and ‘external’ Move.
  • Redirect user to the welcome page after ActivityPub plugin is activated.
  • The option to show/hide the “Welcome Page”.
  • User setting to enable/disable Likes and Reblogs

Changed

  • Logged-out remote reply button markup to look closer to logged-in version.
  • No longer federates Delete activities for posts that were not federated.
  • OrderedCollection and OrderedCollectionPage behave closer to spec now.
  • Outbox items now contain the full activity, not just activity objects.
  • Standardized mentions to use usernames only in comments and posts.

Fixed

  • Changelog entries: allow automating changelog entry generation from forks as well.
  • Comments from Fediverse actors will now be purged as expected.
  • Importing attachments no longer creates Outbox items for them.
  • Improved readability in Mastodon Apps plugin string.
  • No more PHP warnings when previewing posts without attachments.
  • Outbox batch processing adheres to passed batch size.
  • Permanently delete reactions that were Undo instead of trashing them.
  • PHP warnings when scheduling post activities for an invalid post.
  • PHP Warning when there’s no actor information in comment activities.
  • Prevent self-replies on local comments.
  • Properly set to audience of Activity instead of changing the Follow Object.
  • Run all Site-Health checks with the required headers and a valid signature.
  • Set updated field for profile updates, otherwise the Update–Activity wouldn’t be handled by Mastodon.
  • Support multiple layers of nested Outbox activities when searching for the Object ID.
  • The Custom-Avatar getter on WP.com.
  • Use the $from account for the object in Move activity for external Moves
  • Use the $from account for the object in Move activity for internal Moves
  • Use add_to_outbox instead of the changed scheduler hooks.
  • Use JSON_UNESCAPED_SLASHES because Mastodon seems to have problems with encoded URLs.
  • Scheduler::schedule_announce_activity to handle Activities instead of Activity-Objects.

5.5.0 – 2025-03-19

Added

  • Added “Enable Mastodon Apps” and “Event Bridge for ActivityPub” to the recommended plugins section.
  • Added Constants to the Site-Health debug informations.
  • Development environment: add Changelogger tool to environment dependencies.
  • Development environment: allow contributors to specify a changelog entry directly from their Pull Request description.
  • Documentation for migrating from a Mastodon instance to WordPress.
  • Support for sending Activities to ActivityPub Relays, to improve discoverability of public content.

Changed

  • Documentation: expand Pull Request process docs, and mention the new changelog process as well as the updated release process.
  • Don’t redirect @-name URLs to trailing slashed versions
  • Improved and simplified Query code.
  • Improved readability for actor mode setting.
  • Improved title case for NodeInfo settings.
  • Introduced utility function to determine actor type based on user ID.
  • Outbox items only get sent to followers when there are any.
  • Restricted modifications to settings if they are predefined as constants.
  • The Welcome page now uses WordPress’s Settings API and the classic design of the WP Admin.
  • Uses two-digit version numbers in Outbox and NodeInfo responses.

Removed

  • Our version of sanitize_url() was unused—use Core’s sanitize_url() instead.

Fixed

  • Ensured that Query::get_object_id() returns an ID instead of an Object.
  • Fix a fatal error in the Preview when a post contains no (hash)tags.
  • Fixed an issue with the Content Carousel and Blog Posts block: https://github.com/Automattic/wp-calypso/issues/101220
  • Fixed default value for activitypub_authorized_fetch option.
  • Follow-Me blocks now show the correct avatar on attachment pages.
  • Images with the correct aspect ratio no longer get sent through the crop step again.
  • No more PHP warnings when a header image gets cropped.
  • PHP warnings when trying to process empty tags or image blocks without ID attributes.
  • Properly re-added support for Update and Delete Announcements.
  • Updates to certain user meta fields did not trigger an Update activity.
  • When viewing Reply Contexts, we’ll now attribute the post to the blog user when the post author is disabled.

5.4.1 – 2025-03-04

Fixed

  • Fixed transition handling of posts to ensure that Create and Update activities are properly processed.
  • Show “full content” preview even if post is in still in draft mode.

5.4.0 – 2025-03-03

Added

  • Upgrade script to fix Follower json representations with unescaped backslashes.
  • Centralized place for sanitization functions.

Changed

  • Bumped minimum required WordPress version to 6.4.
  • Use a later hook for Posts to get published to the Outbox, to get sure all post_metas and taxonomys are set stored properly.
  • Use webfinger as author email for comments from the Fediverse.
  • Remove the special handling of comments from Enable Mastodon Apps.

Fixed

  • Do not redirect /@username URLs to the API any more, to improve AUTHORIZED_FETCH handling.

5.3.2 – 2025-02-27

Fixed

  • Remove activitypub_reply_block filter after Activity-JSON is rendered, to not affect the HTML representation.
  • Remove render_block_core/embed filter after Activity-JSON is rendered, to not affect the HTML representation.

5.3.1 – 2025-02-26

Fixed

  • Blog profile settings can be saved again without errors.
  • Followers with backslashes in their descriptions no longer break their actor representation.

5.3.0 – 2025-02-25

Added

  • A fallback Note for Article objects to improve previews on services that don’t support Articles yet.
  • A reply context for Posts and Comments to allow relying parties to discover the whole conversation of a thread.
  • Setting to adjust the number of days Outbox items are kept before being purged.
  • Failed Follower notifications for Outbox items now get retried for two more times.
  • Undo API for Outbox items.
  • Metadata to New Follower E-Mail.
  • Allow Activities on URLs instead of requiring Activity-Objects. This is useful especially for sending Announces and Likes.
  • Outbox Activity IDs can now be resolved when the ActivityPub `Accept header is used.
  • Support for incoming Move activities and ensure that followed persons are updated accordingly.
  • Labels to add context to visibility settings in the block editor.
  • WP CLI command to reschedule Outbox-Activities.

Changed

  • Outbox now precesses the first batch of followers right away to avoid delays in processing new Activities.
  • Post bulk edits no longer create Outbox items, unless author or post status change.
  • Properly process Update activities on profiles and ensure all properties of a followed person are updated accordingly.
  • Outbox processing accounts for shared inboxes again.
  • Improved check for ?activitypub query-var.
  • Rewrite rules: be more specific in author rewrite rules to avoid conflicts on sites that use the “@author” pattern in their permalinks.
  • Deprecate the activitypub_post_locale filter in favor of the activitypub_locale filter.

Fixed

  • The Outbox purging routine no longer is limited to deleting 5 items at a time.
  • Ellipses now display correctly in notification emails for Likes and Reposts.
  • Send Update-Activity when “Actor-Mode” is changed.
  • Added delay to Announce Activity from the Blog-Actor, to not have race conditions.
  • Actor validation in several REST API endpoints.
  • Bring back the activitypub_post_locale filter to allow overriding the post’s locale.

5.2.0 – 2025-02-13

Added

  • Batch Outbox-Processing.
  • Outbox processed events get logged in Stream and show any errors returned from inboxes.
  • Outbox items older than 6 months will be purged to avoid performance issues.
  • REST API endpoints for likes and shares.

Changed

  • Increased probability of Outbox items being processed with the correct author.
  • Enabled querying of Outbox posts through the REST API to improve troubleshooting and debugging.
  • Updated terminology to be client-neutral in the Federated Reply block.

Fixed

  • Fixed an issue where the outbox could not send object types other than Base_Object (introduced in 5.0.0).
  • Enforce 200 status header for valid ActivityPub requests.
  • object_id_to_comment returns a commment now, even if there are more than one matching comment in the DB.
  • Integration of content-visibility setup in the block editor.
  • Update CLI commands to the new scheduler refactorings.
  • Do not add an audience to the Actor-Profiles.
  • Activity::set_object falsely overwrites the Activity-ID with a default.

5.1.0 – 2025-02-06

Added

  • Cleanup of option values when the plugin is uninstalled.
  • Third-party plugins can filter settings tabs to add their own settings pages for ActivityPub.
  • Show ActivityPub preview in row actions when Block Editor is enabled but not used for the post type.

Changed

  • Manually granting activitypub cap no longer requires the receiving user to have publish_post.
  • Allow omitting replies in ActivityPub representations instead of setting them as empty.
  • Allow Base Transformer to handle WP_Term objects for transformation.
  • Improved Query extensibility for third party plugins.

Fixed

  • Negotiation of ActivityPub requests for custom post types when queried by the ActivityPub ID.
  • Avoid PHP warnings when using Debug mode and when the actor is not set.
  • No longer creates Outbox items when importing content/users.
  • Fix NodeInfo 2.0 URL to be HTTP instead of HTTPS.

5.0.0 – 2025-02-03

Changed

  • Improved content negotiation and AUTHORIZED_FETCH support for third-party plugins.
  • Moved password check to is_post_disabled function.

Fixed

  • Handle deletes from remote servers that leave behind an accessible Tombstone object.
  • No longer parses tags for post types that don’t support Activitypub.
  • rel attribute will now contain no more than one “me” value.

See full Changelog on GitHub.

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