Implemented s3 uploading

server/utils/s3.js

@@ -0,0 +1,33 @@
+import crypto from 'crypto';
+import moment from 'moment';
+
+const makePolicy = () => {
+  const policy = {
+    conditions: [
+      {'bucket': process.env.AWS_S3_UPLOAD_BUCKET_NAME},
+      ['starts-with', '$key', ''],
+      {'acl': 'public-read'},
+      ['content-length-range', 0, process.env.AWS_S3_UPLOAD_MAX_SIZE],
+      ['starts-with', '$Content-Type', 'image'],
+      ['starts-with', '$Cache-Control', ''],
+    ],
+    expiration: moment().add(24*60, 'minutes').format('YYYY-MM-DDTHH:mm:ss\\Z'),
+  };
+
+  console.log(policy)
+
+  return new Buffer(JSON.stringify(policy)).toString('base64')
+};
+
+const signPolicy = (policy) => {
+  const signature = crypto.createHmac(
+    'sha1',
+    process.env.AWS_SECRET_ACCESS_KEY
+  ).update(policy).digest('base64');
+  return signature;
+};
+
+export {
+  makePolicy,
+  signPolicy,
+};