@aws-amplify/storage/dist/esm/providers/s3/utils/md5.mjs

Storage category of aws-amplify

import { Md5 } from '@smithy/md5-js';
import '@aws-amplify/core/internals/aws-client-utils';
import './client/runtime/s3TransferHandler/fetch.mjs';
import 'fast-xml-parser';
import './client/runtime/s3TransferHandler/xhr.mjs';
import { utf8Encode, toBase64 } from './client/runtime/base64/index.native.mjs';
import '@aws-amplify/core/internals/utils';

// Copyright Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
const calculateContentMd5 = async (content) => {
    const hasher = new Md5();
    if (typeof content === 'string') {
        hasher.update(content);
    }
    else if (ArrayBuffer.isView(content) || content instanceof ArrayBuffer) {
        const blob = new Blob([content]);
        const buffer = await readFileToBase64(blob);
        hasher.update(buffer);
    }
    else {
        const buffer = await readFileToBase64(content);
        hasher.update(utf8Encode(buffer));
    }
    const digest = await hasher.digest();
    return toBase64(digest);
};
const readFileToBase64 = (blob) => {
    return new Promise((resolve, reject) => {
        const reader = new FileReader();
        reader.onloadend = () => {
            // reference: https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readAsDataURL
            // response from readAsDataURL is always prepended with "data:*/*;base64,"
            // reference: https://developer.mozilla.org/en-US/docs/Web/API/FileReader/readyState
            if (reader.readyState !== 2) {
                return reject(new Error('Reader aborted too early'));
            }
            resolve(reader.result.split(',')[1]);
        };
        reader.onabort = () => reject(new Error('Read aborted'));
        reader.onerror = () => reject(reader.error);
        // reader.readAsArrayBuffer is not available in RN
        reader.readAsDataURL(blob);
    });
};

export { calculateContentMd5 };
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