Fix MSS bug when trying to derive a normalized key id (Dash-Industry-Forum#4679)

Author: dsilhavy

src/dash/DashAdapter.js

@@ -1091,7 +1091,7 @@ function DashAdapter() {
     function _getNormalizedKeyIds(contentProtection) {
         const normalizedKeyIds = new Set();
         contentProtection.forEach((contentProtectionElement) => {
-            if (contentProtectionElement.cencDefaultKid) {
+            if (contentProtectionElement.cencDefaultKid && typeof contentProtectionElement.cencDefaultKid === 'string') {
                 normalizedKeyIds.add(contentProtectionElement.cencDefaultKid.replace(/-/g, '').toLowerCase());
             }
         })

src/streaming/protection/models/DefaultProtectionModel.js

@@ -456,7 +456,7 @@ function DefaultProtectionModel(config) {
         const token = { // Implements SessionToken
             session: session,
             keyId: keySystemMetadata.keyId,
-            normalizedKeyId: keySystemMetadata && keySystemMetadata.keyId ? keySystemMetadata.keyId.replace(/-/g, '').toLowerCase() : '',
+            normalizedKeyId: keySystemMetadata && keySystemMetadata.keyId && typeof keySystemMetadata.keyId === 'string' ? keySystemMetadata.keyId.replace(/-/g, '').toLowerCase() : '',
             initData: keySystemMetadata.initData,
             sessionId: keySystemMetadata.sessionId,
             sessionType: keySystemMetadata.sessionType,

src/streaming/protection/models/ProtectionModel_01b.js

@@ -222,7 +222,7 @@ function ProtectionModel_01b(config) {
             const newSession = { // Implements SessionToken
                 sessionId: null,
                 keyId: ksInfo.keyId,
-                normalizedKeyId: ksInfo.keyId.replace(/-/g, '').toLowerCase(),
+                normalizedKeyId: ksInfo && ksInfo.keyId && typeof ksInfo.keyId === 'string' ? ksInfo.keyId.replace(/-/g, '').toLowerCase() : '',
                 initData: ksInfo.initData,
                 hasTriggeredKeyStatusMapUpdate: false,
 

src/streaming/protection/models/ProtectionModel_3Feb2014.js

@@ -336,7 +336,7 @@ function ProtectionModel_3Feb2014(config) {
             // Implements SessionToken
             session: keySession,
             keyId: ksInfo.keyId,
-            normalizedKeyId: ksInfo.keyId.replace(/-/g, '').toLowerCase(),
+            normalizedKeyId: ksInfo && ksInfo.keyId && typeof ksInfo.keyId === 'string' ? ksInfo.keyId.replace(/-/g, '').toLowerCase() : '',
             initData: ksInfo.initData,
             hasTriggeredKeyStatusMapUpdate: false,