catalog-ui/src/app/services/url-tobase64-service.ts

/*-
 * ============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=========================================================
 */

'use strict';

export interface IUrlToBase64Service {
    downloadUrl(url:string, callback:Function):void;
}

export class UrlToBase64Service implements IUrlToBase64Service {
    constructor() {
    }

    public downloadUrl = (url:string, callback:Function):void => {
        let xhr:any = new XMLHttpRequest();

        xhr.onload = ():void => {
            let reader = new FileReader();
            reader.onloadend = ():void => {
                if (xhr.status === 200) {
                    callback(reader.result);
                } else {
                    callback(null);
                }
            };
            reader.readAsDataURL(xhr.response);
        };
        xhr.open('GET', url);
        xhr.responseType = 'blob';
        xhr.send();
    }
}