May 12, 2024

Syndication Links Plugin

A simple way to link to copies of your cross-posted content in other social networks or websites. Now with posting UI.

It supports adding rel-syndication/u-syndication links to your WordPress posts, pages, and comments, indicating where a syndicated copy is, in the form of a text or icon link. You can do this
manually and some plugins support automatically adding their links as well. The plugin contains a generic UI for syndicating to other sites through your site or a Micropub Client.

Privacy and Data Storage Information

This plugin stores syndication links, which can be attached to any post, page, or comment. They can be added to custom post types by filter.

For webmention initiated comments, this information will be added by parsing the source of the webmention.
It is assumed if you send a webmention, you consent to share this information if it is publicly shared on your page. Our recommendation
is that site owners should take down information on request.

For comments initiated on the site, there is built-in way to add these links. For posts, they are typically added by retrieving information stored by other plugins for display. It is assumed
that by installing this plugin, as its intent is to display these links, that you wish to display them.

Settings

Settings for the Syndication Links plugin can be found in the main WordPress “Settings” tab in the
admin dashboard, or if the Indieweb plugin is installed, under the Indieweb tab. The options provided allow for various ways of presenting the syndication links in posts. Syndication Links by default will add links to the content. You can remove this in your plugin if you wish to call the display function directly.

The settings include the following options as follows with either a set of buttons, a check box (with a check indicating that the feature is “on”) or an optional text field:

Display Text – Offers options to display text only, icons only, icons and text, and no display(hidden icons).
Size – Choice of small, medium, or large size icons.
Black Icons – Checking the box defaults to a “black” social media icon set.
Show on Front Page, Archive Page, and Search Results – If checked the icons will show on pages other than a single view. If not checked, the icons will be hidden by the links will remain.
Show on Feed – If checked the icons will show in your RSS feed as well
Text Before Links – This is the text that appears before the Display Text/Icons (as indicated above). The default text is “Syndicated to:” but can be modified if desired.

Note: The particular CSS of your theme may change the display and output of the text and some of the icons.

Supported POSSE plugins and implementations

The plugin supports automatically pulling data from plugins that syndicate your content so you don’t need to do it manually. For anything not built in, integation is easy with a simple filter for potential use with any other plugin.

Social Networks Autoposter – Syndication Links supports Twitter, Facebook, and Tumblr since version 1.0.0
Tumblr Crosspostr – Supports Syndication Links since version 0.8.1
WordPress Crossposter – Supports Syndication Links since version 0.3.2
Diasposter – Supports Syndication Links since version 0.1.8
WP-To_Twitter – Supported by the plugin since version 4.2.3

Using the optional Syndication feature(disabled by default) you can syndicate your posts to:

Bridgy – Bridgy is a service that allows you to post to various sites. Signup is required. It currently supports Github, Mastodon and Flickr. The plugin supports Bridgy Publish via Micropub by default.
Bridgy Fed – Bridgy Fed is a service that allows you to interact with federated social networks using webmentions.
Micro.blog – Micro.blog is a social network and publishing platform for independent microblogs, created by Manton Reece. It uses a custom feed you can add to Micro.blog to support this.
Pinboard – Pinboard is a bookmarking site. The support for this is currently only enabled if you have Post Kinds enabled, due to the difficulty in getting a URL. It will bookmark the URL of any object you are citing.
Custom Webmention Syndication – Add any site that supports publishing by sending a webmention by configuring it in the settings page

Will be looking to integrate with other plugins to add more options and invite developers to add support if they wish as the interface is simple.
The goal of the interface is not only can you syndicate via Micropub, but in the editor using a simple checkbox.

Credits

In no particular order…

The Indieweb community of users and all users of this plugin
Meitar Moscovitz for fixes and code contributions related to support of the plugin in his various plugins.
Justin Tadlock for the initial Social Icons design.
Jihaisse and Peter Molnar for the SNAP, courtesy of WordPress Syndication
Simple-Icons for their icon packs for logos. Simple Icons is licensed under CC0 v1.0 Universal.
Genericons Neue for their generic icon packs. Genericons Neue is licensed under the GPLv2.
Chris Aldrich for many suggestions on improving the display and for screenshots.
PHPCS is used with the WordPress and PHP Compatibility Standards in order to ensure compatibility with supported versions of PHP and enact WordPress Coding Standards.
GitHub Actions is used to actively test against various PHP versions

Installation

Upload the folder ‘syndication-links’ to the ‘/wp-content/plugins/’ directory
Activate the plugin through the ‘Plugins’ menu in WordPress

Or install through the WordPress Plugin Directory.

Screenshots

Example of Syndication Links metabox with links filled in
Example of output display on website

FAQ

How do I prevent the links from being automatically added to the content?

You will have to add the following code to your theme add_filter( 'syndication_links_display', '__return_false' ); and then you can call get_syndication_links() directly in your theme. You should add
this to the init hook.

`get_post_syndication_links( $post, $args ) – Returns the HTML for a post.
get_comment_syndication_links( $comment, $args ) - Returns the HTML for a comment. ** $args ***style- Defaults to ul ***text- Display text, defaults to settings option ***icons- Display icons, defaults to settings option ***container-css- Class to wrap entire syndication links in ***single-css- Class to wrap a single link in ***text-css` – Class to wrap the text before the links in

How can I look up the original if I have a syndication link?

If you add ?original-of= and the URL-encoded URL it will return the post that has that URL stored. As no two posts should have the same two syndication links it will by default only return the first.

If you want to do this with a form, there is a function you can add to your theme called get_original_of_form() and a widget that calls this. Like the search form if you have a
originalofform.php in your theme folder the function will return it so you can customize the form.

What filters are available to modify output?

syn_rewrite_secure( $domains ) – $domains is an array of domain names to rewrite to https if found
syn_metabox_types( $screens ) – $screens would be an array of post types to add the Syndication Link metabox to.
syn_network_strings( $strings ) – $strings is an array of descriptive text strings by domain name
syn_add_links( $urls, $post_ID ) – (Deprecated) $urls is an array of retrieved links from $post_ID
get_post_syndication_links( $urls, $post_ID) – Replaces syn_add_links.
get_comment_syndication_links( $urls, $comment_ID – Filters an array of retrieved comment syndication links.
syn_links_display_defaults( $defaults ) – Filter the defaults for displaying Syndication Links
syndication_link_checked( $checked, $uid, $post_ID ) – Will check a syndication provider($uid) when loaded. The post ID is passed through to allow more specific targeting.
syndication_link_disabled( $disabled, $uid, $post_ID ) – Will disable the checkbox for a syndication provider($uid) when loaded. The post ID is passed through to allow more specific targeting.
syn_link_title( $title, $name ) – Allows you to set the title string for Links. Example, pinboard => Pinboard.
syn_link_mapping( $icon, $url ) – Allows you to override or set the mapping from URL to icon name.
pre_syn_link_icon( $icon, $name ) – Allows you to provide a custom icon. Icons by default are SVG, not URL or filenames.
syndication_links_display( true ) – Adds Syndication Links to content display. Set to false if the theme supports this.

How do I contribute or file bug reports?

Development and bug reports on this plugin is on Github at https://github.com/dshanske/syndication-links

Changelog

Version 4.4.20 ( 2024-05-12 )

Refresh icons
Add filtering of some HTML tags for publishing
Update Micropub token text

Version 4.4.19 ( 2024-03-12 )

One final tweak today

Version 4.4.18 ( 2024-03-12 )

Introduce custom excerpting function for syndication

Version 4.4.17 ( 2024-03-12 )

Fix for issue in not properly passing content to Micropub.

Version 4.4.16 ( 2024-02-25 )

Update Simple Icons to latest
Remove custom bluesky icon in favor of current one
Generate minimal CSS file with just the icon colors for Bridgy supported services that can be manually queued
Add support for 10ups Twitter Autoshare plugin
Add Syndication provider for Bluesky via Bridgy

Version 4.4.15 ( 2023-12-05 )

Fix issue with constant

Version 4.4.14 ( 2023-12-01 )

Update support for WP-To-Twitter plugin, now Xposter.

Version 4.4.13 ( 2023-10-21 )

Add featured derived from the thumbnail of the post for the micropub syndication mf2.
Add nostr icon
Add cloud icon colored blue as placeholder for Bluesky
Add map from indieweb news to indieweb icon

Version 4.4.12 ( 2023-10-01 )

Only alow for immediate publishing if the post status is publish
Refresh dependencies
Bump minimum version to PHP 7.0

Version 4.4.11 ( 2023-5-28 )

Disable the option to use the webmention version of Bridgy where Micropub is available and use constant instead.

Version 4.4.10 ( 2023-05-28 )

Add API Key tab to the settings page
Minor tweaks to improve the rendering of the settings page

Version 4.4.9 ( 2023-05-22 )

Refresh Simple Icon set

Version 4.4.8 ( 2023-05-22 )

Add labels to settings
Remove Twitter Bridgy support due Bridgy removing it.

Version 4.4.7 ( 2023-02-18 )

Make posts always enabled for Syndication Links by default to try to address issues people had with same.

Version 4.4.6 ( 2023-02-10 )

Emergency release to deal with critical error caused by removal of Bridgy settings.

Version 4.4.5 ( 2023-02-10 )

Add labels to settings
Fix load issues introduced in previous version
Migrate Bridgy Specific settings to universal settings by reimplementing them for Micropub.

Version 4.4.4 ( 2023-01-24 )

Remove support for Reddit which does not have a publishing option
Per request developer of Bridgy only offer Micropub as a basic action
Improve disabled and checkbox handling
Improve WordPress to Micropub conversion and use function from Post Kinds

Version 4.4.3 ( 2023-01-02 )

Improve response to error and store logs in a metafield.

Version 4.4.2 ( 2022-12-25 )

Fix a miscalled function
Adjust the load of options to better display
Add notation regarding difference between Micropub and Webmention for Bridgy

Version 4.4.1 ( 2022-12-20 )

Add function to shorten content to title for Twitter Micropub if longer than 280 characters
Add function to shorten content to title for Mastodon Micropub if longer than 500 characters
Fix respecting of excerpt settings for Twitter and Mastodon
Fix issue with saving Syndication Links

Version 4.4.0 ( 2022-12-19 )

Add filter to disable content addition
Hide settings if not being used
Refresh icons
Decommission Meetup as no longer offered by Bridgy
New Tabbed Settings Page
Add options to select which post types will offer syndication and links
Add option to disable use of wp cron and publish immediately
Introduce support for Bridgy via Micropub
Fix issue with Mastodon Autoposter

Version 4.3.11 ( 2022-05-14 )

Refresh icons and CSS build logic
Add function to determine mastodon URLs using the mastodon fields in user profiles

Version 4.3.10 ( 2022-02-13 )

Refresh icons and other dependencies
Save syndication on save, and publish on publish, whereas previously it would only save if you published.

Version 4.3.9 ( 2022-01-11 )

Switch empty links to data tags.
Switch to new query https://github.com/microdotblog/issues/issues/81 for microdotblog to save on multiple polling requests.

Version 4.3.8 ( 2022-01-08 )

Refresh icons
Fix issue where hidden links were still taking up space.

Version 4.3.7 ( 2021-11-02 )

Refresh icons

Version 4.3.6 ( 2021-07-24 )

Style change

Version 4.3.4 ( 2021-06-12 )

Refresh icons
Switch from id to class for syndication links wrapper

Version 4.3.3 ( 2021-02-28 )

Fix issue with schema.

Version 4.3.2 ( 2021-02-28 )

Introduce pre_syndication_links_webmention hook to allow you to clear cache before sending webmention.
Fix various PHP errors.

Version 4.3.1 ( 2020-12-12 )

Introduce syn_link_name filter that allows you to set the name string.
Introduce pre_syn_link_icon filter to allow short circuiting the domain mapping and providing an SVG of your choice.
Save last return in post meta for diagnostic purposes.

Version 4.3.0 ( 2020-10-13 )

Refresh icons
Add optional Pinboard POSSE that is only enabled with Post Kinds

Version 4.2.6 ( 2020-08-15 )

Update dependencies
Adjust publish hook to try to improve success

Version 4.2.5 ( 2020-08-03 )

Change time delay syndication code to behave more like the ping/webmention code

Version 4.2.4 ( 2020-08-01 )

Change how to decide to postpone syndication if post is scheduled as publish status can be in the future
Add ?syndication query variable to allow for filtering archives by syndication link type

Version 4.2.3 ( 2020-06-28 )

Add support for Reddit Via Bridgy
Dependency and icon updates
Add support for importing links from WP-To-Twitter ( props @tw2113)
Removal of master branch in favor of trunk branch.

Version 4.2.2 ( 2020-03-26 )

Add support for Meetup via Bridgy, props @ngm
Dependency and icon updates
Code organization cleanup, props @tw2113 and @asuh

Version 4.2.1 ( 2019-12-21 )

Fix escaping issue
Improve text for micro.blog syndication
Add filter to allow checkboxes to be disabled or checked or both

Version 4.2.0 ( 2019-12-15 )

Add support for Bridgy Mastodon ( props @CharlieRoseMarie )
Check for empty values ( props @glueckpress )
Enhance Syndication Metabox ( props @glueckpress )
Refactor domain to icon mapping into separate class already there to map custom domains
Fix issue where PHPCS was rewriting wordpress to WordPress
Switch provider disable functionality to enable functionality
Redo domain to icon mapping logic
Add micro.blog POSSE support

Version 4.1.4 ( 2019-11-18 )

Refresh icons
Fix icon association to news.indieweb.org

Version 4.1.3 ( 2019-07-01 )

Fix issue with providers not loading because of name change in webmention plugin
Refresh icons

Version 4.1.2 ( 2019-05-12 )

Update icon size to be relative
Reschedule syndication if post status is in future
Trigger edit post hook if syndication links are added to try to invalidate cache

Version 4.1.1 ( 2019-04-13 )

Update icons
Fix minor typo
Attempt at cache busting

Version 4.1.0 ( 2019-02-09 )

Switch to inline SVG over SVG sprites to reduce load size
Add ability to configure arbitrary webmention POSSE providers on the settings page

Version 4.0.5 ( 2019-01-05 )

Fix minor bug introduced in customizer by original of widget

Version 4.0.4 ( 2018-12-29 )

Add setting to use the excerpt if set for Bridgy Publish to Twitter
Indienews(news.indieweb.org) will no longer be a bundled provider per request due spam issues
When automatically added to content wrap the links in an element for styling
Add function get_original_of_form() which creates a search for for the original of query which looks up posts by their syndication link
Added widget that calls new original of form function

Version 4.0.3 ( 2018-12-08 )

Checks for 5.0 compatibility.

Version 4.0.2 ( 2018-11-05 )

Fix PHP notice about incorrect setting
Restore Bridgy global settings options that were in the Bridgy plugin to disable the link back to the post and ignore whitespace

Version 4.0.1 ( 2018-11-03 )

Fix issue with settings caused in previous version
Add base Bridgy class to store settings
Fix issue with display

Version 4.0.0 ( 2018-11-01 )

Add support for syndicating posts using an interface to any arbitrary provider
include support for syndicating from Micropub to any arbitrary provider

Version 3.4.1 ( 2018-05-06 )

Refresh Simple Icons
Remove internationalization of icon names
Update development environment
Add Syndication data to JSONFeed
Do not add syndication information to the content of a jsonfeed
Add privacy policy and export data support for WordPress 4.9.6
Add privacy notice to readme

Version 3.4.0 ( 2018-03-03 )

Updated Simple Icons to latest version
Switched Genericons Neue to a submodule as the svg version was not distributed in the npm package
Added support for Mastodon Auto Post per request. Unable to test due not using same
Added support for Keyring Social Importer. Unable to test due not using same
Simplified saving of metadata
Changed Metabox to a dynamically generated array

Version 3.3.2 ( 2018-02-03 )

Updated Simple Icons to latest version

Version 3.3.1 ( 2018-01-04 )

Updated Simple Icons to latest version
Support for pulling data out for SNAP out of Post Meta without dependence on SNAP classes

Version 3.3.0 ( 2017-12-?? )

Switched to Simple Icons as larger, updated, and maintained more frequently than Automattic’s Social Icons repo
Added in the Genericon Neue pack for when there is no logo for a site with a series of generic icons
SVG Sprite only will be distributed instead of individual SVG files
Icon colors automatically generated from Simple Icons repository
Icon names automatically generated from Simple Icon repository
New code to try and find an icon without hard coding the domain to icon relationship by trying to find the icon name inside the domain string.
Development tools now configured for bringing in PHPCS Coding Standards and generating new files
Screenshots!
License information included for the plugin as well as dependencies
Again, automation automation automation

Version 3.2.4 ( 2017-11-23 )

Changelog will now note a release date
Added/redid colors for many links

Version 3.2.3

Remove Social Support as Plugin is no longer listed in WordPress repository
Add additional syndication icons
Fix textdomain issues
Add PHP Compatibility tests and textdomain tests
PHPCS Improvements
Add setting for disabling links in feed

Version 3.2.2

Remove H-Card Widget

Version 3.2.1

Break add get_syndication_links function into smaller pieces ( props @Ruxton )
Adds get_syndication_links_elements which returns array of anchor tags
Adds get_syndication_links_display_defaults to return default options
Adds get_syndication_links_text_before to return textbefore on it’s own

Version 3.2.0

Add support for comment syndication links
Add CSS for styling text before

Version 3.1.1

Fix documentation re priority of content filter
Remove empty check as interfering with filter
Add uniqueness check after filter

Version 3.1.0

Cleanup of settings attributes using enhancements available in WordPress 4.7
Individual SVG icons and code to generate an SVG sprite now included in the plugin
Option to have hidden links now available
Small Medium and Large CSS files are included by option – generated by sass
Option to disable links being added to content removed as they can now be hidden. Any theme that wants to call the display function directly will have to remove the content filter
Add arguments to get_syndication_links to allow for customized presentation
Adding ?original-of=url with url being the syndication URL will return the original entry.

Version 3.0.5

Change storage of syndication links in order to match Micropub plugin. Storage is now array
Remove old property once migrated to new
Remove JSON REST filter as deprecated
Add support for the official Medium plugin per request @chrisaldrich

Version 3.0.4

Compatibility update
Add textdomain for language support

Version 3.0.2

* Adjust close bracket

Version 3.0.1

* Fix text display issue

Version 3.0.0

* Remove icon fonts in favor of SVG * Remove rel-me support to move to implementation in Indieweb plugin * Remove h-card support to move to implementation in Indieweb plugin (it wasn't very good anyway) * Introduce new get_syndication_data function to abstract out storage

Version 2.1.0

* Removed user meta code

Version 2.0.3

* Minor Tweaks and Cleanup

Version 2.0.2

* CSS fixes * Version number added to CSS import to avoid caching on update

Version 2.0.1

* Misc. Bug Fixes * Bridgy Publish Support removed - new Bridgy plugin will handle that

Version 2.0.0

* Rewritten to remove global scoping * Option to add URLs to the head of the home page for rel-me auth * Option to add URLs as a widget for rel-me auth

Version 1.0.3

* Security Fix. Nothing new

Version 1.0.2

* Refinements * Add support for pages and a filter to add additional content types

Version 1.0.0

* Refinements * Addition of h-card widget. * Improvements to hooks * Addition of automatic information from SNAP and Social(courtesy WordPress Syndication). * Now supports second font choice and choice of color or black.

Version 0.6.0

* Add hooks and functions to allow additional urls to be added

Version 0.5.0

* Clean up the plugin for initial release to WordPress repository.

Version 0.5

* Moved to simplified data structure. * Hidden migration function

Version 0.4

* Rewriting using Grunt/SASS for more flexibility

Version 0.3

* Customizable Networks finished. * Changed social icons CSS to automatically add only if the class for the list has social-icon in it.

Version 0.2

* Settings Screen rewritten using WordPress Settings API. * Going to rewrite with customizable networks and thus option to disable sites you do not syndicate to. * Added social icons CSS to automatically add icons to anything in a <LI>

Version 0.1

* Forked from the Semantic Comments plugin. Start of configurable options.