前端对文件进行分段读取和加密

采用 FileReader 对文件进行分段读取，通过 CryptoJS 对文件进行分段加密，需要引用 import CryptoJS from 'crypto-js';

function calculateMD5InChunks(file, chunkSize) {
  return new Promise((resolve) => {
    const md5 = CryptoJS.algo.MD5.create();
    const reader = new FileReader();
    let currentChunk = 0;

    reader.onload = function (e) {
      // Update hash for this chunk
      md5.update(CryptoJS.lib.WordArray.create(e.target.result));
      currentChunk++;

      if (currentChunk < Math.ceil(file.size / chunkSize)) {
        // Read next chunk
        reader.readAsArrayBuffer(file.slice(currentChunk * chunkSize, (currentChunk + 1) * chunkSize));
      } else {
        // All chunks read and processed, get the final hash
        const hash = md5.finalize().toString(CryptoJS.enc.Hex);
        resolve(hash);
      }
    };

    // Start reading the file in chunks
    reader.readAsArrayBuffer(file.slice(0, chunkSize));
  })
}

async function uploadBtn(options) {
  calculateMD5InChunks(options.file, 1024 * 64).then(async (rs) => {
    const formData = new FormData()
    formData.append('file', options.file)
    formData.append('Md5', rs)
    const data = await coreUploadApi2(formData);
    console.log('data => ', data)
  });
}