@unicef-polymer/etools-unicef/src/etools-upload/offline/file-conversion.js

eTools UNICEF library of reusable components

export function getBlobAsText(file) {
    return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.addEventListener('loadend', (_) => {
            resolve(reader.result);
        });
        reader.addEventListener('error', reject);
        reader.readAsText(file);
    });
}
export function getArrayBuffer(blob) {
    return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.addEventListener('loadend', (_) => {
            resolve(reader.result);
        });
        reader.addEventListener('error', reject);
        reader.readAsArrayBuffer(blob);
    });
}
export async function getBlob(fileUrl) {
    //* * Using XHR */
    // return new Promise((resolve, reject) => {
    //   let xhr = new XMLHttpRequest();
    //   let blob;
    //   xhr.open('GET', blobUrl, true);
    //   xhr.responseType = 'blob';
    //   xhr.addEventListener('load', function () {
    //     if (xhr.status === 200) {
    //       blob = xhr.response;
    //       resolve(blob);
    //     }
    //   });
    //   xhr.send();
    // });
    //* * Using fetch */
    const response = await fetch(fileUrl);
    return response.blob();
}
export function getFileUrl(file, doNotRevokeUrl) {
    const tempUrl = window.URL.createObjectURL(file);
    if (!doNotRevokeUrl) {
        setTimeout(() => {
            window.URL.revokeObjectURL(tempUrl); // For Memory management
        }, 3000);
    }
    return tempUrl;
}