Merge pull request scratchfoundation#5101 from LLK/file-download-safari

Allow some kind of downloading to work on iOS Safari

Author: benjiwheeler

src/lib/download-blob.js

@@ -8,11 +8,23 @@ export default (filename, blob) => {
         return;
     }
 
-    const url = window.URL.createObjectURL(blob);
-    downloadLink.href = url;
-    downloadLink.download = filename;
-    downloadLink.type = blob.type;
-    downloadLink.click();
-    window.URL.revokeObjectURL(url);
-    document.body.removeChild(downloadLink);
+    if ('download' in HTMLAnchorElement.prototype) {
+        const url = window.URL.createObjectURL(blob);
+        downloadLink.href = url;
+        downloadLink.download = filename;
+        downloadLink.type = blob.type;
+        downloadLink.click();
+        document.body.removeChild(downloadLink);
+        window.URL.revokeObjectURL(url);
+    } else {
+        // iOS Safari, open a new page and set href to data-uri
+        let popup = window.open('', '_blank');
+        const reader = new FileReader();
+        reader.onloadend = function () {
+            popup.location.href = reader.result;
+            popup = null;
+        };
+        reader.readAsDataURL(blob);
+    }
+
 };