feat(Ads): Support HTMLResource on non-linear VAST ads (#7710)

Author: avelad

lib/ads/ad_utils.js

@@ -130,17 +130,29 @@ shaka.ads.Utils = class {
    */
   static processNonLinearAd_(interstitials, currentTime, nonLinear) {
     const TXml = shaka.util.TXml;
-    const staticResource = TXml.findChild(nonLinear, 'StaticResource');
-    if (!staticResource) {
-      return;
+    let mimeType = null;
+    let resource = TXml.findChild(nonLinear, 'StaticResource');
+    if (resource) {
+      mimeType = resource.attributes['creativeType'];
+    } else {
+      resource = TXml.findChild(nonLinear, 'HTMLResource');
+      if (!resource) {
+        return;
+      }
+      mimeType = 'text/html';
     }
-    const adUrl = TXml.getContents(staticResource);
+    let adUrl = TXml.getContents(resource);
     if (!adUrl) {
       return;
     }
-    const width = TXml.parseAttr(nonLinear, 'width', TXml.parseInt);
-    const height = TXml.parseAttr(nonLinear, 'height', TXml.parseInt);
-    if (!width || !height) {
+    if (mimeType === 'text/html') {
+      adUrl = 'data:text/html;charset=UTF-8,' + encodeURIComponent(adUrl);
+    }
+    const width = TXml.parseAttr(nonLinear, 'width', TXml.parseInt) ||
+        TXml.parseAttr(nonLinear, 'expandedWidth', TXml.parseInt);
+    const height = TXml.parseAttr(nonLinear, 'height', TXml.parseInt) ||
+        TXml.parseAttr(nonLinear, 'expandedHeight', TXml.parseInt);
+    if (!width && !height) {
       return;
     }
     let playoutLimit = null;
@@ -158,7 +170,7 @@ shaka.ads.Utils = class {
       startTime: startTime,
       endTime: null,
       uri: adUrl,
-      mimeType: staticResource.attributes['creativeType'] || null,
+      mimeType,
       isSkippable: false,
       skipOffset: null,
       skipFor: null,
@@ -180,8 +192,8 @@ shaka.ads.Utils = class {
           y: 0,
         },
         size: {
-          x: width,
-          y: height,
+          x: width || 0,
+          y: height || 0,
         },
       },
     });