//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
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//
//      http://www.apache.org/licenses/LICENSE-2.0
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// distributed under the License is distributed on an "AS IS" BASIS,
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=== Consent API

Starting with Apache Unomi 1.3 (still in development), a new API for consent management is now available. This API
is designed to be able to store/retrieve/update visitor consents in order to comply with new
privacy regulations such as the https://en.wikipedia.org/wiki/General_Data_Protection_Regulation[GDPR].

==== Profiles with consents

Visitor profiles now contain a new Consent object that contains the following information:

* a scope
* a type identifier for the consent. This can be any key to reference a consent. Note that Unomi does not manage consent
definitions, it only stores/retrieves consents for each profile based on this type
* a status : GRANT, DENY or REVOKED
* a status date (the date at which the status was updated)
* a revocation date, in order to comply with GDPR this is usually set at two years

Here is an example of a Profile with a consent attached to it:

[source]
----
{
    "profileId": "8cbe380f-57bb-419d-97bf-24bf30178550",
    "sessionId": "0d755f4e-154a-45c8-9169-e852e1d706d9",
    "consents": {
        "example/newsletter": {
            "scope": "example",
            "typeIdentifier": "newsletter",
            "status": "GRANTED",
            "statusDate": "2018-05-22T09:44:33Z",
            "revokeDate": "2020-05-21T09:44:33Z"
        }
    }
}
----

It is of course possible to have multiple consents defined for a single visitor profile.

==== Consent type definitions

Apache Unomi does not manage consent definitions, it leaves that to an external system (for example a CMS) so that it
can handle user-facing UIs to create, update, internationalize and present consent definitions to end users.

The only thing that is import to Apache Unomi to manage visitor consents is a globally unique key, that is called the
consent type.

==== Creating / update a visitor consent

A new built-in event type called "modifyConsent" can be sent to Apache Unomi to update a consent for the current
profile.

Here is an example of such an event:

[source]
----
{
  "events": [
    {
      "scope": "example",
      "eventType": "modifyConsent",
      "source": {
        "itemType": "page",
        "scope": "example",
        "itemId": "anItemId"
      },
      "target": {
        "itemType": "anyType",
        "scope": "example",
        "itemId": "anyItemId"
      },
      "properties": {
        "consent": {
          "typeIdentifier": "newsletter",
          "scope": "example",
          "status": "GRANTED",
          "statusDate": "2018-05-22T09:27:09.473Z",
          "revokeDate": "2020-05-21T09:27:09.473Z"
        }
      }
    }
  ]
}
----

You could send it using the following curl request:

[source]
----
curl -H "Content-Type: application/json" -X POST -d '{"source":{"itemId":"homepage","itemType":"page","scope":"example"},"events":[{"scope":"example","eventType":"modifyConsent","source":{"itemType":"page","scope":"example","itemId":"anItemId"},"target":{"itemType":"anyType","scope":"example","itemId":"anyItemId"},"properties":{"consent":{"typeIdentifier":"newsletter","scope":"example","status":"GRANTED","statusDate":"2018-05-22T09:27:09.473Z","revokeDate":"2020-05-21T09:27:09.473Z"}}}]}' http://localhost:8181/cxs/context.json?sessionId=1234
----

==== How it works (internally)

Upon receiving this event, Apache Unomi will trigger the modifyAnyConsent rule that has the following definition:

[source]
----
{
  "metadata" : {
    "id": "modifyAnyConsent",
    "name": "Modify any consent",
    "description" : "Modify any consent and sets the consent in the profile",
    "readOnly":true
  },

  "condition" : {
    "type": "modifyAnyConsentEventCondition",
    "parameterValues": {
    }
  },

  "actions" : [
    {
      "type": "modifyConsentAction",
      "parameterValues": {
      }
    }
  ]

}
----

As we can see this rule is pretty simple it will simply execute the modifyConsentAction that is implemented by the
https://github.com/apache/incubator-unomi/blob/9f1bab437fd93826dc54d318ed00d3b2e3161437/plugins/baseplugin/src/main/java/org/apache/unomi/plugins/baseplugin/actions/ModifyConsentAction.java[ModifyConsentAction Java class]

This class will update the current visitor profile to add/update/revoke any consents that are included in the event.