Implemented s3 uploading

server/api/user.js

@@ -1,5 +1,10 @@
+import uuid from 'uuid';
 import Router from 'koa-router';
 
+import {
+  makePolicy,
+  signPolicy,
+} from '../utils/s3';
 import auth from './authentication';
 import { presentUser } from '../presenters';
 import { User } from '../models';
@@ -7,7 +12,40 @@ import { User } from '../models';
 const router = new Router();
 
 router.post('user.info', auth(), async (ctx) => {
-  ctx.body = { data: presentUser(ctx.state.user) };
+  ctx.body = { data: await presentUser(ctx.state.user) };
+});
+
+router.post('user.s3Upload', auth(), async (ctx) => {
+  let { filename, kind, size } = ctx.request.body;
+  ctx.assertPresent(filename, 'filename is required');
+  ctx.assertPresent(kind, 'kind is required');
+  ctx.assertPresent(size, 'size is required');
+
+  const s3Key = uuid.v4();
+  const key = `${s3Key}/${filename}`;
+  const policy = makePolicy();
+
+  console.log(policy, signPolicy(policy));
+
+  ctx.body = { data: {
+    max_upload_size:          process.env.AWS_S3_UPLOAD_MAX_SIZE,
+    upload_url:               process.env.AWS_S3_UPLOAD_BUCKET_URL,
+    form: {
+      AWSAccessKeyId:       process.env.AWS_ACCESS_KEY_ID,
+      "Cache-Control":      "max-age=31557600",
+      "Content-Type":       kind,
+      key:                  key,
+      acl:                  "public-read",
+      signature:            signPolicy(policy),
+      policy:               policy,
+    },
+    asset: {
+      content_type:         kind,
+      url:                  `${process.env.AWS_S3_UPLOAD_BUCKET_URL}${s3Key}/${filename}`,
+      name:                 filename,
+      size:                 size,
+    },
+  }};
 });
 
 export default router;

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,
+};