amazon s3 - Browser upload direct to s3, barebones Node.js -

found writeup on heroku on uploading private s3 buckets, direct browsers:

https://devcenter.heroku.com/articles/s3-upload-node

for me, aws-sdk package got in way more helped. dubious s3upload script concern.

how 1 upload directly s3 without cruft in way?

had dig old java-based project figure 1 out. turns out it's nice , simple once down essentials. first, setup quick html form upload:

<form action="https://bucketname.s3.amazonaws.com/"       method="post"       enctype="multipart/form-data">   <input type="hidden" name="key" value="key"></input>   <input type="hidden" name="awsaccesskeyid" value="access_key"></input>   <input type="hidden" name="policy" value="policy"></input>   <input type="hidden" name="signature" value="signature"></input>   <input type='file' name='file'>   <input type='submit' value='upload driver photo'> </form> 

next, cook quick node.js script generate values policy , signature above, encodedpolicy , signature variables below. remember, both values must base64 encoded:

var crypto=require("crypto"),   bucketname="bucketname",   secretkey="secret_key",   s3key="key",   expiration= new date(); expiration.setdate(expiration.getdate()+1); var policy={   expiration:expiration.toisostring(),   conditions:[     {bucket:bucketname},     {key:s3key}   ] },   encodedpolicy=new buffer(json.stringify(policy)).tostring("base64"),   signature=crypto.createhmac(     "sha1", secretkey   ).update(encodedpolicy).digest("base64"); 

wrap node.js code above in promise tastiness. embed in angular/rest, express templating, or other middleware/presentation framework of choice.

please note: code above not limit upload file size. done condition, i.e. 50mb limit: ["content-length-range", 0, 52428800].