synt_backend/helpers/formidable.js

Synt light-weight node backend service

const { formidable } = require("formidable");
import { uploadFileToBucket } from "./upload";

export function handleFormidableForm(req) {
  return new Promise((resolve, reject) => {
    let formFiles;
    let formData = {};
    const form = formidable({ multiples: true }); // multipart required
    form.parse(req, async (err, fields, files) => {
      if (err) {
        reject(err);
      }
      formFiles = files.files;
    });
    form.on("field", (fieldName, fieldValue) => {
      let value;
      try {
        value = JSON.parse(fieldValue);
      } catch (error) {
        value = fieldValue;
      }
      formData[fieldName] = value;
    });
    form.once("end", () => {
      console.log("done");
      resolve({ formFiles, formData });
    });
  });
}

export async function uploadFiles(formFiles, formData, bucket, callback) {
  // handle form and check fields
  let calls = [];
  console.log("Uploading files");

  // If formFiles is not an array, convert it to an array containing a single File object
  if (!Array.isArray(formFiles)) {
    formFiles = [formFiles];
  }

  formFiles.forEach((f) =>
    calls.push(
      new Promise((resolve, reject) => {
        uploadFileToBucket(f, bucket)
          .then((response) => {
            if (response.success) {
              resolve(response.File);
            } else {
              reject(response);
            }
          })
          .catch((err) => reject(err));
      })
    )
  );
  // make sure all calls are done before callback
  let Files = await Promise.all(calls);
  formData.Files = Files;
  callback(formData);
}

export async function uploadFilesAsync(formFiles, formData, bucket) {
  return new Promise((resolve) => {
    uploadFiles(formFiles, formData, bucket, (formData) => resolve(formData));
  });
}