impress: restrict presentation in readonly mode

When export is disabled or watermarks are enabled, presentation in readonly mode
is disabled.
This is checked in the frontend by the WOPI property `DisablePresentation`
that is synthesized in the wsd. Also check when calling the presentation
command.
WOPIFileInfo::getWatermarkText() is stubbed on mobile.

Signed-off-by: Hubert Figuière <hub@collabora.com>
Change-Id: I4f7aff9f670f7523dfcf396f6009a272df9d5af8

browser/src/control/Control.Menubar.js

@@ -1324,7 +1324,6 @@ L.Control.Menubar = L.Control.extend({
 			!window.ThisIsAMobileApp ? 'exportdirectpdf' : 'downloadas-pdf', !window.ThisIsAMobileApp ? 'exportepub' : 'downloadas-epub', // file menu
 			'downloadas-ods', 'downloadas-xls', 'downloadas-xlsx', 'downloadas-csv', 'closedocument', // file menu
 			'fullscreen', 'zoomin', 'zoomout', 'zoomreset', 'showstatusbar', 'togglemenubar', 'showresolved', 'toggledarktheme', // view menu
-			'fullscreen-presentation', 'presentation-currentslide', 'present-in-window', // slide menu
 			'about', 'keyboard-shortcuts', 'latestupdates', 'feedback', 'online-help', 'report-an-issue', // help menu
 			'insertcomment'
 		]
@@ -1341,6 +1340,10 @@ L.Control.Menubar = L.Control.extend({
 		// Use original template as provided by server
 		this._menubarCont = map.mainMenuTemplate.cloneNode(true);
 		$('#main-menu-state').after(this._menubarCont);
+
+		if (!this._map['wopi'].DisablePresentation)
+			this.options.allowedViewModeActions = this.options.allowedViewModeActions.concat(['fullscreen-presentation', 'presentation-currentslide', 'present-in-window']);
+
 		this._initializeMenu(this.options.initial);
 
 		map.on('doclayerinit', this._onDocLayerInit, this);

browser/src/map/handler/Map.SlideShow.js

@@ -36,6 +36,11 @@ L.Map.SlideShow = L.Handler.extend({
 	},
 
 	_onFullScreen: function (e) {
+		if (this._checkPresentationDisabled()) {
+			this._notifyPresentationDisabled();
+			return;
+		}
+
 		if (this._checkAlreadyPresenting()) {
 			this._notifyAlreadyPresenting();
 			return;
@@ -94,6 +99,11 @@ L.Map.SlideShow = L.Handler.extend({
 	},
 
 	_onPresentWindow: function (e) {
+		if (this._checkPresentationDisabled()) {
+			this._notifyPresentationDisabled();
+			return;
+		}
+
 		if (this._checkAlreadyPresenting()) {
 			this._notifyAlreadyPresenting();
 			return;
@@ -295,6 +305,16 @@ L.Map.SlideShow = L.Handler.extend({
 			_('OK'), null, false);
 	},
 
+	_checkPresentationDisabled: function() {
+		return this._map['wopi'].DisablePresentation;
+	},
+
+	_notifyPresentationDisabled: function() {
+		this._map.uiManager.showInfoModal('presentation-disabled-modal',
+			_('Presentation disabled'),
+			_('Presentation mode has been disabled for this document'), '',
+			_('OK'), null, false);
+	},
 
 	_onSlideWindowKeyPress: function(e) {
 		if (e.code === 'Escape') {

browser/src/map/handler/Map.WOPI.js

@@ -32,6 +32,7 @@ L.Map.WOPI = L.Handler.extend({
 	SupportsRename: false,
 	UserCanRename: false,
 	UserCanWrite: false,
+	DisablePresentation: false,
 
 	_appLoadedConditions: {
 		docloaded: false,
@@ -127,6 +128,7 @@ L.Map.WOPI = L.Handler.extend({
 		this.UserCanRename = !!wopiInfo['UserCanRename'];
 		this.EnableShare = !!wopiInfo['EnableShare'];
 		this.UserCanWrite = !!wopiInfo['UserCanWrite'];
+		this.DisablePresentation = wopiInfo['DisablePresentation'];
 
 		if (this.UserCanWrite && !app.isReadOnly()) // There are 2 places that set the file permissions, WOPI and URI. Don't change permission if URI doesn't allow.
 			app.setPermission('edit');

common/MobileApp.hpp

@@ -81,6 +81,7 @@ public:
         bool getDisableExport() const { return false; }
         bool getDisableCopy() const { return false; }
         bool getEnableOwnerTermination() const { return false; }
+        std::string getWatermarkText() const { return std::string(); }
 
         TriState getDisableChangeTrackingShow() const { return TriState::Unset; }
         TriState getDisableChangeTrackingRecord() const { return TriState::Unset; }

wsd/ClientSession.cpp

@@ -1493,6 +1493,12 @@ bool ClientSession::filterMessage(const std::string& message) const
                 allowed = false;
                 LOG_WRN("WOPI host has disabled export for this session");
             }
+            else if (id == "slideshow" && _wopiFileInfo &&
+                     (_wopiFileInfo->getDisableExport() || !_wopiFileInfo->getWatermarkText().empty()))
+            {
+                allowed = false;
+                LOG_WRN("WOPI host has disabled slideshow for this session");
+            }
         }
         else
         {

wsd/DocumentBroker.cpp

@@ -1230,6 +1230,8 @@ DocumentBroker::updateSessionWithWopiInfo(const std::shared_ptr<ClientSession>&
         wopiInfo->set("HideChangeTrackingControls", wopiFileInfo->getHideChangeTrackingControls() ==
                                                         WopiStorage::WOPIFileInfo::TriState::True);
     wopiInfo->set("IsOwner", session->isDocumentOwner());
+    bool disablePresentation = !watermarkText.empty() || wopiFileInfo->getDisableExport() || wopiFileInfo->getHideExportOption();
+    wopiInfo->set("DisablePresentation", disablePresentation);
 
     std::ostringstream ossWopiInfo;
     wopiInfo->stringify(ossWopiInfo);