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    <p>Using the <a href="https://github.com/aws/aws-sdk-ruby" rel="nofollow noreferrer">aws-sdk gem</a>, you can get a temporary signed url for any S3 object by calling <a href="https://docs.aws.amazon.com/AWSRubySDK/latest/AWS/S3/S3Object.html#url_for-instance_method" rel="nofollow noreferrer"><code>url_for</code></a>:</p> <pre><code>s3 = AWS::S3.new( :access_key_id =&gt; 1234, :secret_access_key =&gt; abcd ) object = s3.buckets['bucket'].objects['path/to/object'] object.url_for(:get, { :expires =&gt; 20.minutes.from_now, :secure =&gt; true }).to_s </code></pre> <p>This will give you a signed, temporary use URL for only that object in S3. It expires after 20 minutes (in this example), and it's only good for that one object.</p> <p>If you have lots of objects the client needs, you'll need to issue lots of signed URLs.</p> <blockquote> <p>Or should let the server control all content passing (this solves security of course)? Does this mean I have to download all content to server before handing it down to the connected users?</p> </blockquote> <p>Note that this doesn't mean the server needs to download each object, it only needs to authenticate and authorize specific clients to access specific objects in S3.</p> <p>API docs from Amazon: <a href="https://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#RESTAuthenticationQueryStringAuth" rel="nofollow noreferrer">https://docs.aws.amazon.com/AmazonS3/latest/dev/RESTAuthentication.html#RESTAuthenticationQueryStringAuth</a></p>
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    1. POHow to store data in S3 and allow user access in a secure way with rails API / iOS client?
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    1. COThanks for that @ejdyksen. The solution I've devised used exactly that (I haven't updated the question with my answer)! So my solution was to do authenticated URLs for GET requests. However, when a user contributes content, he creates resources to a specific /bucket/user/objectname location using federated IAM token (temporary credentials that expire) with the policy attached to allow for /bucket/user/* write access. so no user in the system can do harm to other users' content. Seems to work okay. Appreciate your answer.
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