fix(ivy): elements properties should not be stringified (angular#22683)

PR Close angular#22683

Author: marclaval

packages/core/src/render3/instructions.ts

@@ -755,7 +755,9 @@ export function elementProperty<T>(
     setInputsForProperty(dataValue, value);
     markDirtyIfOnPush(node);
   } else {
-    value = (sanitizer != null ? sanitizer(value) : stringify(value)) as any;
+    // It is assumed that the sanitizer is only added when the compiler determines that the property
+    // is risky, so sanitization can be done without further checks.
+    value = sanitizer != null ? (sanitizer(value) as any) : value;
     const native = node.native;
     isProceduralRenderer(renderer) ? renderer.setProperty(native, propName, value) :
                                      (native.setProperty ? native.setProperty(propName, value) :

packages/core/test/render3/compiler_canonical/sanitize_spec.ts

@@ -25,12 +25,13 @@ describe('compiler sanitization', () => {
 
     @Component({
       selector: 'my-component',
-      template: `<div [innerHTML]="innerHTML"></div>` +
+      template: `<div [innerHTML]="innerHTML" [hidden]="hidden"></div>` +
           `<img [style.background-image]="style" [src]="src">` +
           `<script [attr.src]=src></script>`
     })
     class MyComponent {
       innerHTML: string = '<frame></frame>';
+      hidden: boolean = true;
       style: string = `url("http://evil")`;
       url: string = 'javascript:evil()';
 
@@ -47,6 +48,7 @@ describe('compiler sanitization', () => {
             $r3$.ɵe();
           }
           $r3$.ɵp(0, 'innerHTML', $r3$.ɵb(ctx.innerHTML), $r3$.ɵsanitizeHtml);
+          $r3$.ɵp(0, 'hidden', $r3$.ɵb(ctx.hidden));
           $r3$.ɵs(1, 'background-image', $r3$.ɵb(ctx.style), $r3$.ɵsanitizeStyle);
           $r3$.ɵp(1, 'src', $r3$.ɵb(ctx.url), $r3$.ɵsanitizeUrl);
           $r3$.ɵa(1, 'srcset', $r3$.ɵb(ctx.url), $r3$.ɵsanitizeUrl);
@@ -59,6 +61,7 @@ describe('compiler sanitization', () => {
     const div = getHostElement(myComponent).querySelector('div') !;
     // because sanitizer removed it is working.
     expect(div.innerHTML).toEqual('');
+    expect(div.hidden).toEqual(true);
 
     const img = getHostElement(myComponent).querySelector('img') !;
     // because sanitizer removed it is working.

packages/core/test/render3/instructions_spec.ts

@@ -34,7 +34,7 @@ describe('instructions', () => {
   });
 
   describe('elementProperty', () => {
-    it('should use sanitizer function', () => {
+    it('should use sanitizer function when available', () => {
       const t = new TemplateFixture(createDiv);
 
       t.update(() => elementProperty(0, 'title', 'javascript:true', sanitizeUrl));
@@ -45,6 +45,14 @@ describe('instructions', () => {
               0, 'title', bypassSanitizationTrustUrl('javascript:false'), sanitizeUrl));
       expect(t.html).toEqual('<div title="javascript:false"></div>');
     });
+
+    it('should not stringify non string values', () => {
+      const t = new TemplateFixture(createDiv);
+
+      t.update(() => elementProperty(0, 'hidden', false));
+      // The hidden property would be true if `false` was stringified into `"false"`.
+      expect((t.hostNode.native as HTMLElement).querySelector('div') !.hidden).toEqual(false);
+    });
   });
 
   describe('elementStyle', () => {