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path: root/catalog-ui/app/scripts/utils/file-utils.ts
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/*-
 * ============LICENSE_START=======================================================
 * SDC
 * ================================================================================
 * Copyright (C) 2017 AT&T Intellectual Property. All rights reserved.
 * ================================================================================
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 * ============LICENSE_END=========================================================
 */
/// <reference path="../references"/>
module Sdc.Utils {
    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);
            downloadLink.click();

            //time out for firefox
            setTimeout(()=> {
                document.body.removeChild(downloadLink);
                this.$window.URL.revokeObjectURL(url);
            }, 100);
        }

    }
}