Comments on: Lessons Learned: Google App Engine + App Engine Patch + Django + Boto

By: Mitch Garnaat

Mitch Garnaat — Mon, 10 Aug 2009 18:36:55 +0000

Hi -

Boto does provide some methods in the boto.s3.connection module called build_post_args and build_post_policy to help construct the policies and actual form data required for direct POST upload to S3.

Mitch

By: Amey

Amey — Mon, 10 Aug 2009 15:42:41 +0000

Hi Ryan..
I wanted to Make policies and signatures. A library which does all the encoding and signing stuff. But anyways I figure it out after reading the stuff on Amazon.
Amey Kanade
EyeSee360 Inc
Thanks.

By: Amey

Amey — Mon, 10 Aug 2009 15:40:22 +0000

Yo…I almost read everythin what Boto provides…seems like as of now the boto libraries do not provide a easy way u can create policies an signatures for uploads.
The way PUT based policies work and POST based policies work are different.(Check Amazon documentation).
I created my own policy maker for POST based requests which are fairly simple. PUT policy making requires a lot other attributes.

By: ryankanno

ryankanno — Fri, 07 Aug 2009 00:34:00 +0000

@Amey – What type of signatures/policies are you referring to? You can use Boto to set the policies for the S3 buckets/files that you upload, etc.

By: Amey

Amey — Thu, 06 Aug 2009 15:46:02 +0000

Hey Ryan,
I am pretty new to Amazon S3. Is there a mechanism provided by boto or some ither libraries which allow you to construct policies and signatures on the fly. I dont want to get into the hassle of encoding algorithms.

Thanks,
Amey Kanade
Carnegie Mellon University

By: ryankanno

ryankanno — Tue, 07 Apr 2009 10:43:18 +0000

@Ben

Oops, you’re right! Darn migration to Google Apps. In any case, you can reach me at @localkinegrinds.com, or feel free to post your questions here. I also created that missing email address. Ahaha. Thanks for letting me know.

By: Ben

Ben — Mon, 06 Apr 2009 17:49:12 +0000

Hi Ryan, the email provided on your contact page doesn’t work – error given is 50 550-5.1.1 The email account that you tried to reach does not exist. Ping me back, I’d like to send you a question about Subversion at Dreamhost. Thanks.

By: ryankanno

ryankanno — Thu, 02 Apr 2009 18:33:58 +0000

@Mitch

Thanks for the tip! I didn’t even look at the set_contents_from_file signature. Post will be updated shortly!

By: Mitch Garnaat

Mitch Garnaat — Thu, 02 Apr 2009 12:16:36 +0000

Nice article. Just wanted to point out one small improvement you could make to your upload_to_s3 function. You can actually set the ACL when you call set_contents_from_file rather than making another round trip to S3 with a separate call. It would look like this:

new_key.set_contents_from_file(photo, policy=’public-read’)

Mitch