User:Alexbfree/Code:GDPRMailAccess.js

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const DATA_CONTROLLER_ITEM_ID = 96;  // because Q96 is data controller"
const INSTANCE_OF_PROPERTY = 'claims.P3'; // because P3 is the property "instance of"

function generateGDPRLink(dataControllerItemID) {
	// make an API call to expand the letter template, using this item.
	let api = new mw.Api();
    api.get( {
			    action: 'expandtemplates',
			    text: '{{User:Alexbfree/Template:DataControllerMenu|qID='+dataControllerItemID+'}}'
			} ).done( function ( data ) {
        var expanded = $(data.expandtemplates["*"])
    	mw.notify( expanded , { autoHide: false } ); // pop up the notification with the link
	} );
}

function claimUsesDataControllerAsItsObject(claim) {
	return dive( claim , 'mainsnak.datavalue.value')['numeric-id'] === DATA_CONTROLLER_ITEM_ID;
}


mw.hook( 'wikibase.entityPage.entityLoaded' ).add( function ( entity ) {
     'use strict';
     console.log( entity );
      
     // get the ID of the current page
	 var pageID = document.querySelector('.wikibase-title .wikibase-title-id').innerText.replace( /[()]/g, '' );
     console.log(pageID);

     if (isDataController(entity)) {
	   console.log('is dc');
	   generateGDPRLink(pageID);
     }
});

function isDataController(entity) {
	let foundThatThisIsAnInstanceOfDataController = false;
	console.log('here1');

	if ( typeof entity !=  "undefined" ) // if we are on the page of a loaded entity
	{
	  console.log( "entity is defined" );
	  console.log('here2');
	  console.dir(entity);
	  if ( typeof check( entity, INSTANCE_OF_PROPERTY ) != "undefined" ) // if the entity has any "instance of" claim
	  {
		console.log('here3');
		let claims = dive( entity, INSTANCE_OF_PROPERTY ); // get the claims which use the "instance of" property
		if (claims.some(claimUsesDataControllerAsItsObject))
		{
		  console.log('here4');
		  foundThatThisIsAnInstanceOfDataController = true;
		}
	  }
	}
	return foundThatThisIsAnInstanceOfDataController;
}