From afe20b79a64266e64011f34b26a30b3d1c62fd47 Mon Sep 17 00:00:00 2001
From: =?utf8?q?Micha=C5=82=20Go=C5=82=C4=99biowski-Owczarek?=
 <m.goleb@gmail.com>
Date: Wed, 12 May 2021 00:59:42 +0200
Subject: [PATCH] Datepicker: Make sure text option are text, shorten HTML
 strings

Instead of using enormous HTML strings, various elements are now constructed
using jQuery APIs. This makes it more obvious user-provided data is used
correctly.

Fixes #15284
Closes gh-1953
---
 tests/unit/datepicker/options.js |  51 ++++++++++++
 ui/widgets/datepicker.js         | 136 ++++++++++++++++++++++++++-----
 2 files changed, 166 insertions(+), 21 deletions(-)

diff --git a/tests/unit/datepicker/options.js b/tests/unit/datepicker/options.js
index e5e938a0f..e58b9a75d 100644
--- a/tests/unit/datepicker/options.js
+++ b/tests/unit/datepicker/options.js
@@ -1171,4 +1171,55 @@ QUnit.test( "Ticket 7602: Stop datepicker from appearing with beforeShow event h
 	inp.datepicker( "destroy" );
 } );
 
+QUnit.test( "Ticket #15284: escaping text parameters", function( assert ) {
+	assert.expect( 7 );
+
+	var done = assert.async();
+
+	var qf = $( "#qunit-fixture" );
+
+	window.uiGlobalXss = [];
+
+	var inp = testHelper.init( "#inp", {
+		showButtonPanel: true,
+		showOn: "both",
+		prevText: "<script>uiGlobalXss = uiGlobalXss.concat( [ 'prevText XSS' ] )</script>",
+		nextText: "<script>uiGlobalXss = uiGlobalXss.concat( [ 'nextText XSS' ] )</script>",
+		currentText: "<script>uiGlobalXss = uiGlobalXss.concat( [ 'currentText XSS' ] )</script>",
+		closeText: "<script>uiGlobalXss = uiGlobalXss.concat( [ 'closeText XSS' ] )</script>",
+		buttonText: "<script>uiGlobalXss = uiGlobalXss.concat( [ 'buttonText XSS' ] )</script>",
+		appendText: "<script>uiGlobalXss = uiGlobalXss.concat( [ 'appendText XSS' ] )</script>"
+	} );
+
+	var dp = $( "#ui-datepicker-div" );
+
+	testHelper.onFocus( inp, function() {
+		assert.equal( dp.find( ".ui-datepicker-prev" ).text().trim(),
+			"<script>uiGlobalXss = uiGlobalXss.concat( [ 'prevText XSS' ] )</script>",
+			"prevText escaped" );
+		assert.equal( dp.find( ".ui-datepicker-next" ).text().trim(),
+			"<script>uiGlobalXss = uiGlobalXss.concat( [ 'nextText XSS' ] )</script>",
+			"nextText escaped" );
+		assert.equal( dp.find( ".ui-datepicker-current" ).text().trim(),
+			"<script>uiGlobalXss = uiGlobalXss.concat( [ 'currentText XSS' ] )</script>",
+			"currentText escaped" );
+		assert.equal( dp.find( ".ui-datepicker-close" ).text().trim(),
+			"<script>uiGlobalXss = uiGlobalXss.concat( [ 'closeText XSS' ] )</script>",
+			"closeText escaped" );
+
+		assert.equal( qf.find( ".ui-datepicker-trigger" ).text().trim(),
+			"<script>uiGlobalXss = uiGlobalXss.concat( [ 'buttonText XSS' ] )</script>",
+			"buttonText escaped" );
+		assert.equal( qf.find( ".ui-datepicker-append" ).text().trim(),
+			"<script>uiGlobalXss = uiGlobalXss.concat( [ 'appendText XSS' ] )</script>",
+			"appendText escaped" );
+
+		assert.deepEqual( window.uiGlobalXss, [], "No XSS" );
+
+		delete window.uiGlobalXss;
+		inp.datepicker( "hide" ).datepicker( "destroy" );
+		done();
+	} );
+} );
+
 } );
diff --git a/ui/widgets/datepicker.js b/ui/widgets/datepicker.js
index f03e075cd..4fd8843cf 100644
--- a/ui/widgets/datepicker.js
+++ b/ui/widgets/datepicker.js
@@ -240,7 +240,9 @@ $.extend( Datepicker.prototype, {
 			inst.append.remove();
 		}
 		if ( appendText ) {
-			inst.append = $( "<span class='" + this._appendClass + "'>" + appendText + "</span>" );
+			inst.append = $( "<span>" )
+				.addClass( this._appendClass )
+				.text( appendText );
 			input[ isRTL ? "before" : "after" ]( inst.append );
 		}
 
@@ -257,12 +259,32 @@ $.extend( Datepicker.prototype, {
 		if ( showOn === "button" || showOn === "both" ) { // pop-up date picker when button clicked
 			buttonText = this._get( inst, "buttonText" );
 			buttonImage = this._get( inst, "buttonImage" );
-			inst.trigger = $( this._get( inst, "buttonImageOnly" ) ?
-				$( "<img/>" ).addClass( this._triggerClass ).
-					attr( { src: buttonImage, alt: buttonText, title: buttonText } ) :
-				$( "<button type='button'></button>" ).addClass( this._triggerClass ).
-					html( !buttonImage ? buttonText : $( "<img/>" ).attr(
-					{ src:buttonImage, alt:buttonText, title:buttonText } ) ) );
+
+			if ( this._get( inst, "buttonImageOnly" ) ) {
+				inst.trigger = $( "<img>" )
+					.addClass( this._triggerClass )
+					.attr( {
+						src: buttonImage,
+						alt: buttonText,
+						title: buttonText
+					} );
+			} else {
+				inst.trigger = $( "<button type='button'>" )
+					.addClass( this._triggerClass );
+				if ( buttonImage ) {
+					inst.trigger.html(
+						$( "<img>" )
+							.attr( {
+								src: buttonImage,
+								alt: buttonText,
+								title: buttonText
+							} )
+					);
+				} else {
+					inst.trigger.text( buttonText );
+				}
+			}
+
 			input[ isRTL ? "before" : "after" ]( inst.trigger );
 			inst.trigger.on( "click", function() {
 				if ( $.datepicker._datepickerShowing && $.datepicker._lastInput === input[ 0 ] ) {
@@ -1703,32 +1725,104 @@ $.extend( Datepicker.prototype, {
 			this._daylightSavingAdjust( new Date( drawYear, drawMonth - stepMonths, 1 ) ),
 			this._getFormatConfig( inst ) ) );
 
-		prev = ( this._canAdjustMonth( inst, -1, drawYear, drawMonth ) ?
-			"<a class='ui-datepicker-prev ui-corner-all' data-handler='prev' data-event='click'" +
-			" title='" + prevText + "'><span class='ui-icon ui-icon-circle-triangle-" + ( isRTL ? "e" : "w" ) + "'>" + prevText + "</span></a>" :
-			( hideIfNoPrevNext ? "" : "<a class='ui-datepicker-prev ui-corner-all ui-state-disabled' title='" + prevText + "'><span class='ui-icon ui-icon-circle-triangle-" + ( isRTL ? "e" : "w" ) + "'>" + prevText + "</span></a>" ) );
+		if ( this._canAdjustMonth( inst, -1, drawYear, drawMonth ) ) {
+			prev = $( "<a>" )
+				.attr( {
+					"class": "ui-datepicker-prev ui-corner-all",
+					"data-handler": "prev",
+					"data-event": "click",
+					title: prevText
+				} )
+				.append(
+					$( "<span>" )
+						.addClass( "ui-icon ui-icon-circle-triangle-" +
+							( isRTL ? "e" : "w" ) )
+						.text( prevText )
+				)[ 0 ].outerHTML;
+		} else if ( hideIfNoPrevNext ) {
+			prev = "";
+		} else {
+			prev = $( "<a>" )
+				.attr( {
+					"class": "ui-datepicker-prev ui-corner-all ui-state-disabled",
+					title: prevText
+				} )
+				.append(
+					$( "<span>" )
+						.addClass( "ui-icon ui-icon-circle-triangle-" +
+							( isRTL ? "e" : "w" ) )
+						.text( prevText )
+				)[ 0 ].outerHTML;
+		}
 
 		nextText = this._get( inst, "nextText" );
 		nextText = ( !navigationAsDateFormat ? nextText : this.formatDate( nextText,
 			this._daylightSavingAdjust( new Date( drawYear, drawMonth + stepMonths, 1 ) ),
 			this._getFormatConfig( inst ) ) );
 
-		next = ( this._canAdjustMonth( inst, +1, drawYear, drawMonth ) ?
-			"<a class='ui-datepicker-next ui-corner-all' data-handler='next' data-event='click'" +
-			" title='" + nextText + "'><span class='ui-icon ui-icon-circle-triangle-" + ( isRTL ? "w" : "e" ) + "'>" + nextText + "</span></a>" :
-			( hideIfNoPrevNext ? "" : "<a class='ui-datepicker-next ui-corner-all ui-state-disabled' title='" + nextText + "'><span class='ui-icon ui-icon-circle-triangle-" + ( isRTL ? "w" : "e" ) + "'>" + nextText + "</span></a>" ) );
+		if ( this._canAdjustMonth( inst, +1, drawYear, drawMonth ) ) {
+			next = $( "<a>" )
+				.attr( {
+					"class": "ui-datepicker-next ui-corner-all",
+					"data-handler": "next",
+					"data-event": "click",
+					title: nextText
+				} )
+				.append(
+					$( "<span>" )
+						.addClass( "ui-icon ui-icon-circle-triangle-" +
+							( isRTL ? "w" : "e" ) )
+						.text( nextText )
+				)[ 0 ].outerHTML;
+		} else if ( hideIfNoPrevNext ) {
+			next = "";
+		} else {
+			next = $( "<a>" )
+				.attr( {
+					"class": "ui-datepicker-next ui-corner-all ui-state-disabled",
+					title: nextText
+				} )
+				.append(
+					$( "<span>" )
+						.attr( "class", "ui-icon ui-icon-circle-triangle-" +
+							( isRTL ? "w" : "e" ) )
+						.text( nextText )
+				)[ 0 ].outerHTML;
+		}
 
 		currentText = this._get( inst, "currentText" );
 		gotoDate = ( this._get( inst, "gotoCurrent" ) && inst.currentDay ? currentDate : today );
 		currentText = ( !navigationAsDateFormat ? currentText :
 			this.formatDate( currentText, gotoDate, this._getFormatConfig( inst ) ) );
 
-		controls = ( !inst.inline ? "<button type='button' class='ui-datepicker-close ui-state-default ui-priority-primary ui-corner-all' data-handler='hide' data-event='click'>" +
-			this._get( inst, "closeText" ) + "</button>" : "" );
-
-		buttonPanel = ( showButtonPanel ) ? "<div class='ui-datepicker-buttonpane ui-widget-content'>" + ( isRTL ? controls : "" ) +
-			( this._isInRange( inst, gotoDate ) ? "<button type='button' class='ui-datepicker-current ui-state-default ui-priority-secondary ui-corner-all' data-handler='today' data-event='click'" +
-			">" + currentText + "</button>" : "" ) + ( isRTL ? "" : controls ) + "</div>" : "";
+		controls = "";
+		if ( !inst.inline ) {
+			controls = $( "<button>" )
+				.attr( {
+					type: "button",
+					"class": "ui-datepicker-close ui-state-default ui-priority-primary ui-corner-all",
+					"data-handler": "hide",
+					"data-event": "click"
+				} )
+				.text( this._get( inst, "closeText" ) )[ 0 ].outerHTML;
+		}
+
+		buttonPanel = "";
+		if ( showButtonPanel ) {
+			buttonPanel = $( "<div class='ui-datepicker-buttonpane ui-widget-content'>" )
+				.append( isRTL ? controls : "" )
+				.append( this._isInRange( inst, gotoDate ) ?
+					$( "<button>" )
+						.attr( {
+							type: "button",
+							"class": "ui-datepicker-current ui-state-default ui-priority-secondary ui-corner-all",
+							"data-handler": "today",
+							"data-event": "click"
+						} )
+						.text( currentText ) :
+					"" )
+				.append( isRTL ? "" : controls )[ 0 ].outerHTML;
+		}
 
 		firstDay = parseInt( this._get( inst, "firstDay" ), 10 );
 		firstDay = ( isNaN( firstDay ) ? 0 : firstDay );
-- 
2.39.5