=== ceLTIc LTI Library ===
Contributors: spvickers
Tags: lti, ims, learning tools interoperability, celtic
Requires at least: 3.0
Tested up to: 6.0
Requires PHP: 5.6
Stable tag: 4.7.2
License: GNU General Public License Version 3
License URI: https://www.gnu.org/licenses/gpl-3.0.html

This plugin installs the ceLTIc LTI class library for use by other plugins which use the IMS Learning Tools Interoperability specification.

== Description ==
The IMS Learning Tools Interoperability (LTI) specification provides a standard, secure method by which a platform (e.g. an Learning Management System) can be seamlessly integrated with a tool.  This library plugin provides the support required to allow other plugins to enable WordPress to act as either a platform (so that a blog can be integrated with other content or learning activities) or as a tool (so that a platform can integrate a WordPress blog into their user experience).  For example, the [open source LTI plugin](https://github.com/celtic-project/wordpress-lti/) supports enabling WordPress as a tool.

== Installation ==
This plugin has no user interface; it merely loads the ceLTIc LTI library and any dependencies so that they are available for use by other plugins.  Just activate it to have the library loaded for any other plugins you wish to activate which use it.

== Frequently Asked Questions ==

= Why do I need this plugin? =

If you use a plugin which uses the ceLTIc LTI library, this plugin provides an alternative from using composer to install this dependent library for each individual plugin, and avoids the need for server access to do so.  It also avoids having multiple versions of the library installed and makes it easy to keep the library up-to-date when new releases are made.

= Will my other LTI plugins work without this one? =

This will depend upon how the plugins have been written, but the [LTI plugin](https://github.com/celtic-project/wordpress-lti/) will look for the ceLTIc LTI library either within its own dependent library area or use one loaded elsewhere, whichever is loaded first.  This plugin will not affect any plugins which do not use the ceLTIc LTI library.

== Changelog ==

See the [library's version history](https://github.com/celtic-project/LTI-PHP/wiki/Version-history).

= 4.6.2 =

First release as a WordPress plugin.

= 4.6.3 =

* Update UserResult->getId for users not associated with a resource link
* Update to latest release of Firebase/php-jwt library
* Minor bug fixes

= 4.6.4 =

Fix bug with handling public keys in PEM format in Firebase JWT client
Enhance JWT clients
Enhance handling of Content items

= 4.6.5 =

Remove erroneous GROUP BY clauses in SQL for data connectors
Improve debug logging for missing message handlers

= 4.7.0 =

Fix bug with checking state value on LTI 1.3 messages
Add support for groups to belong to more than one groupset (so set element of a group may now be an array of strings rather than just a string)
Correct value of iss claim in client_assertion JWT when requesting an access token
Add option to allow use of HTTP GET for LTI 1.3 authentication requests
Improve mapping between JWT claims and OAuth1 message parameters (uses "lti1p1_" prefix for any "https://purl.imsglobal.org/spec/lti/claim/lti1p1" claims; added "target_link_uri" and "unmapped_claims" parameters)

= 4.7.1 =

Fix bug with format of JWT claim using FirebaseClient

= 4.7.2 =

Fix mapping of LTI 1.3 claim for Basic Outcomes service
Add check for Course Groups service in `getMemberships` method
Added checks for required properties of optional message claims
Fix bug with updating date of last access for a platform
Fix handling of groups belonging to more than one group in Moodle API hook
Deprecated CanvasApiToolProvider class (use CanvasApiTool instead)
Fix signing of extension service requests with LTI 1.3