Amazon s3: how to set file viewing permission -


i developing web system uses amazon s3 file server. files uploaded s3 directly , corresponding urls written html page. example, have file @ s3 location is:

https://myaccount.amazonaws.com/files/abc.png

and in html put:

<img src="https://myaccount.amazonaws.com/files/abc.png">

the image show correctly in browser. however, happen have set permission on s3 everyone viewable, means file open public.

how restrict file viewing permission members of site, not public?

there several ways grant access amazon s3 objects:

  • access control lists (acls) on each individual object
  • a bucket policy on specific bucket
  • an iam policy (identity , access management) on specific user/group
  • signed urls (signed, time-limited urls)

the first question, however, how define "the members of site, not public". assume mean "to people want allow access app, , not others", , app knows these users, not defined in iam. (iam used store users access aws environment. should not used track users of application.)

for situation, recommend use of signed urls. way work is:

  • the object kept private (no public access)
  • your application constructs signed url grants temporary access object
  • when sending html users, refer objects via signed url (eg pictures, downloadable documents)

so, application responsible determining whether should allowed access s3 content and, if so, permit access via signed url.

for details on constructing signed url, see:

basically, uses permissions associated iam user does have access object, , uses hash of iam user's secret key 'sign' request.


Comments

Post a Comment

Popular posts from this blog

angularjs - ADAL JS Angular- WebAPI add a new role claim to the token -

i have created angular spa webapi backend using adal js authentication.as there no roles in ad, need manually add role claims in order give users access different api controllers. the roles stored in database. expecting inject claim through call webapi after authentication ad. webapi code might this. identity.addclaim(new claim("role", "user")); var ticket = new authenticationticket(identity, props); var accesstoken = startup.oauthbeareroptions.accesstokenformat.protect(ticket); is possible replace adal idtoken new token? is viable solution or there other better way handle this? as initial token generated azuread, possible edit token add new claim? appreciated. graph api supporting group claims. see here: http://justazure.com/azure-active-directory-part-4-group-claims/ if @ examples on page, users assigned groups , app can check group in claims. in current version of portal, need app manifest , modify it.
Read more

php - CakePHP HttpSockets send array of paramms -

i problem when make request (i can request). $link = 'http://uri/path/?param1=1&sid=2&sid=3&sid=4' $http = $httpsocket = new httpsocket(); $res = $httpsocket->get($link); if check request pr($http); i see : [line] => /url/path/?param1=1&sid%5b0%5d=2&sid%5b1%5d=3&sid%5b2%5d=4 http/1.1 and i'm getting empty response because server doesn't know parameters sid%5b0%5d=2 when try send parameters array : $data = array('param1' => '1', 'sid' => array('2','3', '4')); i see same changes %5b0%5d - additional indexes. how fix it? unfortunately , can not change server side, if send request in browser, i'll normal response in json format. when make request, can parameters this: $param1 = $_get['param1']; $sid= $_get['sid']; tip: use diferente names parameters. have multiples sid. use sid1, sid2, sid3... update: can parameters this:
Read more

node.js - Using Node without global install -

i'm working on few node & electron (atom shell) projects , i'm curious how them work without user having install node globally. i've seen few applications including node directory in project contains node.exe binary. how go setting node project use binary? edit: thought should add, i've searched everywhere answer this, unrelated results.
Read more