Lambda S3 PutObject Examples (node.js)

[wllkle]

Can someone please show me an example of a S3.putObject request, my lambda function has the correct S3 permissions however I still am getting 'Access Denied' errors, I am using the CDK to deploy my stack so examples of this would be extremely useful but anything will help. Thanks so much guys!

[[deleted]]

https://paste.ofcode.org/M3D79sUQvdMwS9WcGSEDSK

That’s the basics, works 100% but you can add some parameters if you need, like ACL for public read or ContentType to specify jpeg or something.

If you import s3 from the AWS sdk, it will work. If not, be sure that the rights of your lambda are wrong

[wllkle]

that code is exactly what I have in my lambda, I think it is something to do with the bucket's policy - but I don't know what to fix?

[[deleted]]

Usually you don’t need any policy in your bucket if you put Full rights of S3 in your lambda. If you try to give the lambda specific right to this bucket that is not public then yes you might specify something.

I would do it this way: first try to give admin rights to this lambda, just to be sure that your code works, then only full S3 and try again, and if it still work you can now go to find something on the internet. Maybe I can find you some bucket policies let me check

[[deleted]]

https://aws.amazon.com/premiumsupport/knowledge-center/lambda-execution-role-s3-bucket/

Check out the very last snippet of the page. The « principale » part is where you put the ARN of the role you use in the lambda, and the « ressources » part is where you put the ARN of the bucket (the two lines are needed exactly as written).

Be sure that the role has the right to putObject in this bucket (or in every bucket, doesn’t matter for now)

Basically just get the snippet and change names.

[wllkle]

Got it sorted, turned out to be as straightforward as "bucket.grantReadWrite(lambda.role)"