1 files changed, 51 insertions, 0 deletions
diff --git a/catalog-ui/src/app/utils/file-utils.ts b/catalog-ui/src/app/utils/file-utils.ts
new file mode 100644
index 0000000000..d8c18229c3
--- /dev/null
+++ b/catalog-ui/src/app/utils/file-utils.ts
@@ -0,0 +1,51 @@
+export class FileUtils {
+
+    static '$inject' = [
+        '$window'
+    ];
+
+    constructor(private $window:any) {
+    }
+
+    public byteCharactersToBlob = (byteCharacters, contentType):any => {
+        contentType = contentType || '';
+        let sliceSize = 1024;
+        let bytesLength = byteCharacters.length;
+        let slicesCount = Math.ceil(bytesLength / sliceSize);
+        let byteArrays = new Array(slicesCount);
+
+        for (let sliceIndex = 0; sliceIndex < slicesCount; ++sliceIndex) {
+            let begin = sliceIndex * sliceSize;
+            let end = Math.min(begin + sliceSize, bytesLength);
+
+            let bytes = new Array(end - begin);
+            for (let offset = begin, i = 0; offset < end; ++i, ++offset) {
+                bytes[i] = byteCharacters[offset].charCodeAt(0);
+            }
+            byteArrays[sliceIndex] = new Uint8Array(bytes);
+        }
+        return new Blob(byteArrays, {type: contentType});
+    };
+
+    public base64toBlob = (base64Data, contentType):any => {
+        let byteCharacters = atob(base64Data);
+        return this.byteCharactersToBlob(byteCharacters, contentType);
+    };
+
+    public downloadFile = (blob, fileName):void=> {
+        let url = this.$window.URL.createObjectURL(blob);
+        let downloadLink = document.createElement("a");
+
+        downloadLink.setAttribute('href', url);
+        downloadLink.setAttribute('download', fileName);
+        document.body.appendChild(downloadLink);
+
+        var clickEvent = new MouseEvent("click", {
+            "view": window,
+            "bubbles": true,
+            "cancelable": true
+        });
+        downloadLink.dispatchEvent(clickEvent);
+
+    }
+}