s3-imageresizer/index.js

Get image buffer from url,Resize image using buffer/url, upload image buffer to s3,

var request = require("request").defaults({ encoding: null });
var fs = require("fs");
var fileType = require("file-type");
var sharp = require("sharp");
var AWS = require("aws-sdk");

exports.getImageInBufferFromUrl = function(url) {
  var image = {};
  return new Promise(function(resolve, reject) {
    request.get(url, function(err, res, body) {
      if (err) {
        reject(err);
      }
      image.buffer = body;
      image.name = url.split("/")[url.split("/").length - 1];
      resolve(image);
    });
  });
};

exports.resizeImageFromBuffer = function(buffer, width, height) {
  return new Promise(function(resolve, reject) {
    sharp(buffer)
      .resize(width, height, { kernel: sharp.kernel.nearest })
      .toBuffer()
      .then(function(resizedBuffer) {
        resolve(resizedBuffer);
      })
      .catch(function(error) {
        reject(error);
      });
  });
};

exports.uploadBufferToS3 = function(
  fileStream,
  accessKeyId,
  secretAccessKey,
  bucketName,
  path = null,
  imageName
) {
  let s3client = new AWS.S3({
    accessKeyId: accessKeyId,
    secretAccessKey: secretAccessKey,
    params: {
      Bucket: bucketName,
      Key: path
    }
  });
  var imgtype = fileType(fileStream);
  var imgName = imageName;
  if (path) {
    imgName = `${path}/${imageName}`;
  }
  return new Promise(function(resolve, reject) {
    s3client.upload(
      {
        ACL: "public-read",
        ContentType: imgtype.mime,
        Body: fileStream,
        Key: imgName
      },
      function(err, result) {
        if (err) {
          reject(err);
        } else {
          resolve(result);
        }
      }
    );
  });
};

exports.resizeImageFromUrl = function(url, width, height) {
  let image = {};
  return new Promise(function(resolve, reject) {
    request.get(url, function(err, res, body) {
      if (err) {
        reject(err);
      }
      sharp(body)
        .resize(width, height, { kernel: sharp.kernel.nearest })
        .toBuffer()
        .then(function(resizedBuffer) {
          image.buffer = resizedBuffer;
          image.name = url.split("/")[url.split("/").length - 1];
          resolve(image);
        })
        .catch(function(error) {
          reject(error);
        });
    });
  });
};