resolve-upload-local/es/index.js

This package is local uploader adapter.

import fs from 'fs';
import request from 'request';
import uuid from 'uuid/v4';
import crypto from 'crypto';

const createPresignedPut = async (pool, dir) => {
  const uploadId = uuid();
  const uploadUrl = `http://localhost:3000/uploader?dir=${dir}&uploadId=${uploadId}`;
  return {
    uploadUrl,
    uploadId
  };
};

export const upload = (uploadUrl, filePath) => {
  const fileSizeInBytes = fs.statSync(filePath).size;
  const fileStream = fs.createReadStream(filePath);
  return new Promise((resolve, reject) => request.put({
    headers: {
      'Content-Length': fileSizeInBytes
    },
    uri: uploadUrl,
    body: fileStream
  }, (error, _, body) => {
    error ? reject(error) : body ? reject(body) : resolve();
  }));
};

const createPresignedPost = async (pool, dir) => {
  const uploadId = uuid();
  const form = {
    url: `http://localhost:3000/uploader?dir=${dir}&uploadId=${uploadId}`,
    fields: {}
  };
  return {
    form,
    uploadId
  };
};

export const uploadFormData = (form, filePath) => {
  const fileStream = fs.createReadStream(filePath);
  return new Promise((resolve, reject) => request.post({
    url: form.url,
    formData: {
      file: fileStream
    }
  }, error => {
    error ? reject(error) : resolve();
  }));
};

const createToken = ({
  secretKey
}, {
  dir,
  expireTime = 3600
}) => {
  const payload = Buffer.from(JSON.stringify({
    dir,
    expireTime: Date.now() + expireTime * 1000
  })).toString('base64').replace(/=/g, '');
  const signature = crypto.createHmac('md5', secretKey).update(payload).digest('hex');
  return `${payload}*${signature}`;
};

const createUploadAdapter = pool => {
  const {
    directory,
    bucket,
    secretKey
  } = pool;
  return Object.freeze({
    createPresignedPut: createPresignedPut.bind(null, pool),
    createPresignedPost: createPresignedPost.bind(null, pool),
    createToken: createToken.bind(null, pool),
    upload: upload,
    uploadFormData: uploadFormData,
    directory,
    bucket,
    secretKey
  });
};

export default createUploadAdapter;
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