Function uploadChunked

public/js/sharedDropView.js:501–548

(item)

  }

  async function uploadChunked(item) {
    const rel = getRelativePathForItem(item.file);
    const totalChunks = Math.max(1, Math.ceil(item.file.size / CHUNK_SIZE));
    const uploadId = makeUploadId();

    for (let index = 1; index <= totalChunks; index++) {
      const start = (index - 1) * CHUNK_SIZE;
      const end = Math.min(item.file.size, start + CHUNK_SIZE);
      const blob = item.file.slice(start, end);

      const formData = new FormData();
      appendCommonFormData(formData);
      formData.append('resumableChunkNumber', String(index));
      formData.append('resumableTotalChunks', String(totalChunks));
      formData.append('resumableIdentifier', uploadId);
      formData.append('resumableFilename', item.file.name);
      formData.append('resumableTotalSize', String(item.file.size));
      formData.append('resumableCurrentChunkSize', String(blob.size));
      if (rel) {
        formData.append('resumableRelativePath', rel);
      }
      formData.append('file', blob, item.file.name + '.part' + index);

      const maxAttempts = 3;
      let attempt = 0;
      let sent = false;
      while (attempt < maxAttempts && !sent) {
        attempt += 1;
        try {
          await xhrJson(uploadUrl, formData, function (evt) {
            if (!evt.lengthComputable) return;
            const chunkPct = evt.total > 0 ? (evt.loaded / evt.total) : 0;
            const base = (index - 1) / totalChunks;
            const pct = Math.round((base + (chunkPct / totalChunks)) * 100);
            setItemStatus(item, 'uploading', pct);
          });
          sent = true;
        } catch (err) {
          if (attempt >= maxAttempts) {
            throw err;
          }
        }
      }

      const donePct = Math.round((index / totalChunks) * 100);
      setItemStatus(item, 'uploading', donePct);
    }
  }

  async function uploadItem(item) {
    const validationMsg = validateQueueItem(item);