A minimal example of batch uploading files directly to Amazon Web Service's Simple Storage Service (AWS S3) using Clojure.
Amazon's inability to receive batch file uploads direct to S3, left unchecked, will inexorably lead to endless re-implementation of the same boilerplate code to manually send a batch of files one by one. Plus, authenticating direct POSTs to AWS can be tricky.
Clone the repo to your local machine. Set the aws-bucket in demo.clj
and create environment variables AWS_ACCESS_KEY and AWS_SECRET_KEY
for your Amazon credentials. Then lein ring server, select some
files, and click the upload button. Boom--you just saved yourself
hours of double-checking encodings and writing workaround code.
We present the user with a file selection dialog. Included on the page
is a hidden form with a set of authentication fields, including a
base-64 encoded policy document and a HMAC-SHA1 signature for that
policy document, both created on the server. The policy document
matches the hidden authentication form fields. See
src/aws_s3_upload_clj/demo.clj.
A listener waits for file selection events, adding any selected files
to the upload-queue atom. When the user initiates the upload, each
file in the upload-queue is individually wrapped up in an POST along
with the authentication field data contained in the hidden form. This
POST is sent direct to S3 with a core.async channel waiting on its
completion. See src-cljs/upload.cljs.
Copyright © 2014 David Liepmann
Released under the The MIT License (MIT). See LICENSE.txt.