Merge pull request #1975 from christianmemije/download

Disable download button for Android WebView

Author: rtibbles

kolibri/plugins/learn/assets/src/views/content-page/index.vue

@@ -142,9 +142,42 @@
     },
     data: () => ({ wasIncomplete: false }),
     computed: {
+      /**
+        * Detects whether an Android device is using WebView.
+        * Based on https://developer.chrome.com/multidevice/user-agent#webview_user_agent
+        */
+      isAndroidWebView() {
+        const ua = window.navigator.userAgent;
+        const isAndroid = /Android/.test(ua);
+
+        if (isAndroid) {
+          const androidVersion = parseFloat(ua.match(/Android\s([0-9\.]*)/)[1]);
+          const isChrome = /Chrome/.test(ua);
+
+          // WebView UA in Lollipop and Above
+          // Android >=5.0
+          if (androidVersion >= 5.0 && isChrome && /wv/.test(ua)) {
+            return true;
+          }
+
+          // WebView UA in KitKat to Lollipop
+          // Android >= 4.4
+          if (androidVersion >= 4.4 && androidVersion < 5.0 && isChrome && /Version\//.test(ua)) {
+            return true;
+          }
+
+          // Old WebView UA
+          // Android < 4.4
+          if (androidVersion < 4.4 && /Version\//.test(ua) && /\/534.30/.test(ua)) {
+            return true;
+          }
+        }
+
+        return false;
+      },
       canDownload() {
         if (this.content) {
-          return this.content.kind !== ContentNodeKinds.EXERCISE;
+          return this.content.kind !== ContentNodeKinds.EXERCISE && !this.isAndroidWebView;
         }
         return false;
       },