CODEWITHSUNDEEP
pythonamazon-web-servicesamazon-s3boto3
F128115
F128115

Reputation: 81

Can I upload a image directly on s3 without saving in localfolder?

I am using diff functions to upload images from path like set_contents_from_file() etc . But they take image from path then upload them . Is there any function to directly upload imageObject directly upload from python code ?

Upvotes: 1

Views: 227

Answers (1)

ThomasVdBerge
ThomasVdBerge

Reputation: 8140

Yes, S3 accepts uploads via specially-crafted and pre-authorized HTML POST forms. You can include these forms in any web page to allow your web site visitors to send you files using nothing more than a standard web browser.

Have a look at the S3 POST Upload

Bottomline, it comes to creating a form like this:

<html>
  <head>
    <title>S3 POST Form</title>
    <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  </head>
  <body>
    <form action="https://s3-bucket.s3.amazonaws.com/" method="post" enctype="multipart/form-data">
      <input type="hidden" name="key" value="uploads/${filename}"> <input type="hidden" name="AWSAccessKeyId" value="YOUR_AWS_ACCESS_KEY">
      <input type="hidden" name="acl" value="private">
      <input type="hidden" name="success_action_redirect" value="http://localhost/">
      <input type="hidden" name="policy" value="YOUR_POLICY_DOCUMENT_BASE64_ENCODED">
      <input type="hidden" name="signature" value="YOUR_CALCULATED_SIGNATURE">
      <input type="hidden" name="Content-Type" value="image/jpeg">
      <!-- Include any additional input fields here -->
      File to upload to S3: <input name="file" type="file">
      <br>
      <input type="submit" value="Upload File to S3">
    </form>
  </body>
</html>

Afterwards, add a policy document

S3 POST forms include a policy document that authorizes the form and imposes limits on the files that can be uploaded. When S3 receives a file via a POST form, it will check the policy document and signature to confirm that the form was created by someone who is allowed to store files in the target S3 account.

{"expiration": "2009-01-01T00:00:00Z",
  "conditions": [ 
    {"bucket": "s3-bucket"}, 
    ["starts-with", "$key", "uploads/"],
    {"acl": "private"},
    {"success_action_redirect": "http://localhost/"},
    ["starts-with", "$Content-Type", ""],
    ["content-length-range", 0, 1048576]
  ]
}

And finally, sign your POST requests

To complete your S3 POST form, you must sign it to prove to S3 that you actually created the form. If you do not sign the form properly, or if someone else tries to modify your form after it has been signed, the service will be unable to authorize it and will reject the upload.

import base64
import hmac, hashlib

policy = base64.b64encode(policy_document)

signature = base64.b64encode(hmac.new(AWS_SECRET_ACCESS_KEY, policy, hashlib.sha1).digest())

Upvotes: 1

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