Don't show download button on missing pages

Additional: Pass in a page rather than a skin - skin is not
used anywhere other than to get the page

Bug: T211775
Change-Id: Ia7c56158773ac16992fb1ebf002131e9c24dda14

resources/skins.minerva.scripts/Toolbar.js

@@ -4,7 +4,7 @@
 		ToggleList = require( '../../components/ToggleList/ToggleList.js' ),
 		downloadPageAction = require( './downloadPageAction.js' ).downloadPageAction,
 		Icon = mobile.Icon,
-		skin = mobile.Skin.getSingleton(),
+		page = mobile.currentPage(),
 		/** The top level menu. */
 		toolbarSelector = '.page-actions-menu',
 		/** The secondary overflow submenu component container. */
@@ -83,7 +83,7 @@
 	 * @return {void}
 	 */
 	function renderDownloadButton( window, overflowList ) {
-		var $downloadAction = downloadPageAction( skin,
+		var $downloadAction = downloadPageAction( page,
 			mw.config.get( 'wgMinervaDownloadNamespaces', [] ), window, !!overflowList );
 
 		if ( $downloadAction ) {

resources/skins.minerva.scripts/downloadPageAction.js

@@ -45,9 +45,10 @@
 			chromeVersion = getChromeVersion( userAgent );
 
 		// Download button is restricted to certain namespaces T181152.
+		// Not shown on missing pages
 		// Defaults to 0, in case cached JS has been served.
 		if ( supportedNamespaces.indexOf( page.getNamespaceId() ) === -1 ||
-			page.isMainPage() ) {
+			page.isMainPage() || page.isMissing ) {
 			// namespace is not supported or it's a main page
 			return false;
 		}
@@ -117,13 +118,13 @@
 	 * Generate a download icon for triggering print functionality if
 	 * printing is available
 	 *
-	 * @param {Skin} skin
+	 * @param {Page} page
 	 * @param {number[]} supportedNamespaces
 	 * @param {Window} [windowObj] window object
 	 * @param {boolean} [hasText] Use icon + button style.
 	 * @returns {jQuery.Object|null}
 	 */
-	function downloadPageAction( skin, supportedNamespaces, windowObj, hasText ) {
+	function downloadPageAction( page, supportedNamespaces, windowObj, hasText ) {
 		var
 			modifier = hasText ? 'toggle-list-item__anchor--menu' : 'mw-ui-icon-element',
 			icon,
@@ -134,7 +135,7 @@
 
 		if (
 			isAvailable(
-				windowObj, skin.page, navigator.userAgent,
+				windowObj, page, navigator.userAgent,
 				supportedNamespaces
 			)
 		) {

tests/qunit/skins.minerva.scripts/downloadPageAction.test.js

@@ -86,6 +86,7 @@
 			var page = new Page( {
 				id: 0,
 				title: 'Test',
+				isMissing: false,
 				isMainPage: false
 			} );
 			this.page = page;
@@ -108,10 +109,20 @@
 		assert.notOk( isAvailable( windowChrome, this.page, VALID_UA, [ 9999 ] ) );
 	} );
 
+	QUnit.test( 'isAvailable() handles missing pages', function ( assert ) {
+		var page = new Page( {
+			id: 0,
+			title: 'Missing',
+			isMissing: true
+		} );
+		assert.notOk( isAvailable( windowChrome, page, VALID_UA, VALID_SUPPORTED_NAMESPACES ) );
+	} );
+
 	QUnit.test( 'isAvailable() handles properly main page', function ( assert ) {
 		var page = new Page( {
 			id: 0,
 			title: 'Test',
+			isMissing: false,
 			isMainPage: true
 		} );
 		assert.notOk( isAvailable( windowChrome, page, VALID_UA, VALID_SUPPORTED_NAMESPACES ) );