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+# Authorisation Service Meta Document
+
+## 1. Summary
+
+Authorization is the function of specifying access rights/privileges to resources related to information security and computer security in general and to access control in particular. More formally, "to authorize" is to define an access policy. [Wikipedia](https://en.wikipedia.org/wiki/Authorization)
+
+This specification aims to define a minimal interface for a service allowing to use Role Based Access Control in components, if they need to.
+
+## 2. Why Bother?
+
+While standard permissions can be implemented in way that components do not need to address it themselves, some components might need a more fine grained access to the permissions. A standardised interface enables 3PD to develop authorisation services which can be consumed by those components without having to deal with implementation details.
+
+## 3. Scope
+
+### 3.1 Goals
+
+This specification aims to provide robust interfaces for querying permissions and related information from Authorisation Services that are independent from the particular implementation.
+
+### 3.2 Non-Goals
+
+This specification does not seek to standardise or favor any particular implementation.
+The setup and creation of roles and permissions is up to the implementation and not part of this specification.
+
+## 4. Approaches
+
+Privileges are three-dimensional:
+
+  * **Actor** - a user or a role
+  * **Action** - a verb, sometimes with an intrinsic object
+  * **Target** - an entity or a class of entities 
+
+### 4.1 Access Control in the User Object
+
+#### Examples
+ 
+##### Zizaco/[Entrust][]:
+
+```php
+$allowed = $user->hasRole('admin');
+$allowed = $user->can('edit-user');
+```
+
+##### Joomla 3.7:
+
+```php
+$allowed = JFactory::getUser()->authorise('core.delete', 'com_content.article.' . (int) $record->id)
+```
+
+#### 4.1.1 Projects Using Access Control in the User Object
+
+  * Joomla 3
+  * Zizaco/[Entrust][] (Laravel 5 Package)
+  
+### 4.2 Separated Access Control
+
+#### 4.2.1 Projects Using Separated Access Control
+
+### 4.3 Comparison of Approaches
+
+While having access control in the user object seems very convenient, it requires the user object to support access control explicitly, which violates the [Single Responsibility Principle][].
+ 
+### 4.4 Chosen Approach
+
+This specification follows the Separated Access Control approach.
+
+## 5. Design Decisions
+
+* Some actions, like for example 'access-dashboard', do not need an entity to be applied to.
+  They operate on an 'intrinsic' target, in this case the dashboard.
+  The interfaces make the corresponding parameter optional to address such cases.
+  It is up to then implementation to check if the supplied information is sufficient.
+* The service API is separated into two interfaces.
+  * The *Basic Authorisation Service* interface covers the most widely spread use case for an authentication service and should be easy to implement upon any authorisation solution.
+  * The *Extended Authorisation Service* allows the access to a whole dimension (actors, actions or targets), when the two other values are known. They are very useful in some special cases, but not needed in average components. 
+ 
+## 6. People
+
+### 6.1 Editor(s)
+
+* Niels Braczek, <nbraczek@bsds.de>
+
+### 6.2 Sponsors
+
+* N/A
+
+### 6.3 Contributors
+
+* Klas Berlič Fras, <klas.berlic@gmail.com> 
+
+## 7. Votes
+
+* **Entrance Vote:** _(not yet taken)_
+* **Acceptance Vote:** _(not yet taken)_
+
+## 8. Relevant Links
+
+* Wikipedia article on [Single Responsibility Principle][]
+* [Bouncer](https://github.com/JosephSilber/bouncer) is an elegant, framework-agnostic approach to managing roles and abilities for any app using Eloquent models.
+* [Entrust][] is a succinct and flexible way to add Role-based Permissions to Laravel 5.
+
+[Single Responsibility Principle]: https://en.wikipedia.org/wiki/Single_responsibility_principle
+[Entrust]: https://github.com/Zizaco/entrust
+
+## 9. Errata
+
+...
diff --git a/proposed/authorisation-service.md b/proposed/authorisation-service.md
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+# Authorisation Service
+
+This document describes ...
+
+The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD",
+"SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be
+interpreted as described in [RFC 2119][].
+
+[RFC 2119]: http://tools.ietf.org/html/rfc2119
+
+### References
+
+- [RFC 2119][]: Key words for use in RFCs to Indicate Requirement Levels
+
+## 1. Specification
+
+### 1.1 Basic Authorisation Service
+
+### 1.2 Extended Authorisation Service
+
+## 2. Interfaces
+
+### 2.1 AuthorisationServiceInterface
+
+The following interface MUST be implemented by compatible Basic Authorisation Services.
+
+```php
+namespace Joomla\Service\Authorisation
+
+/**
+ * Basic Authorisation Service Interface
+ */
+interface AuthorisationServiceInterface
+{
+    /**
+     * Check if a particular user is allowed to take a particular action on a particular class or object.
+     *
+     * @param  UserInterface  $actor   The user that will take action
+     * @param  string         $action  The action to be taken
+     * @param  string|object  $target  The class or object to act on.
+     *                                 May be omitted, if `$action` does not require an object.
+     *
+     * @return bool
+     */
+    public function isAllowed($actor, $action, $target = null): bool;
+}
+```
+
+### 2.2 ExtendedAuthorisationServiceInterface
+
+The following interface MUST be implemented by compatible Extended Authorisation Services.
+
+```php
+namespace Joomla\Service\Authorisation
+
+/**
+ * Extended Authorisation Service Interface
+ */
+interface ExtendedAuthorisationServiceInterface
+{
+    /**
+     * Get a list of actors (users) that are allowed to take an action on a particular target (class or object).
+     *
+     * @param  string         $action  The action to be taken
+     * @param  string|object  $target  The class or object to act on.
+     *                                 May be omitted, if `$action` does not require an object.
+     *
+     * @return UserInterface[]
+     */
+    public function getActors($action, $target = null): array;
+
+    /**
+     * Get a list of actions that a particular actor (user) is allowed to take on a particular target (class or object).
+     *
+     * @param  UserInterface  $actor   The user that will take action
+     * @param  string|object  $target  The class or object to act on.
+     *                                 May be omitted, if `$action` does not require an object.
+     *
+     * @return string[]
+     */
+    public function getActions($actor, $target = null): array;
+
+    /**
+     * Get a list of targets (objects) that a particular actor (user) is allowed to take a particular action on.
+     *
+     * @param  UserInterface  $actor        The role or user that will take action
+     * @param  string         $action       The action to be taken
+     * @param  string         $targetClass  Optionally restrict to a particular entity class.
+     *
+     * @return object[]
+     */
+    public function getObjects($actor, $action, $targetClass = null): array;
+}
+```