CODEWITHSUNDEEP
amazon-s3aws-cdkaws-event-bridge
bananabreadbob
bananabreadbob

Reputation: 407

AWS EventBridge Rule Ignoring Key Prefix & Suffix Matching

I have an Event Bridge rule created where when I drop a file into an S3 bucket it will trigger a Step function.

I only want to trigger this rule when:

However this rule is being triggered for any files regardless of their suffix and prefix. For instance I dropped a .pdf file in and it triggered the step function.

    {
      "detail-type": ["Object Created"],
      "source": ["aws.s3"],
      "detail": {
        "bucket": {
          "name": ["my-files-bucket"]
        },
        "object": {,
          "key": [{
            "prefix": "files/"
          }, {
            "suffix": ".csv"
          }]
        }
      }
    }

Upvotes: 3

Views: 3174

Answers (2)

TenHorizons
TenHorizons

Reputation: 58

I have found a workaround to this. EventBridge now supports wildcards for key matching: Filtering events in Amazon EventBridge with wildcard pattern matching

Here is an example of solution (this also shows a scenario where you want to match multiple file types):

{
  "source": ["aws.s3"],
  "detail-type": ["Object Created"],
  "detail": {
    "bucket": {
      "name": ["my-files-bucket"]
    },
    "object": {
      "key": [{
        "wildcard": "files/*.csv"
      }, {
        "wildcard": "files/*.pdf"
      }]
    }
  }
}

Upvotes: 3

fedonev
fedonev

Reputation: 25649

This is the expected behaviour. EventBridge treats multiple values in brackets as an OR condition. Events will match your pattern if the object key begins with files/ OR ends with .csv.

As far as I know, it's not possible to apply an AND condition to a single field.

Upvotes: 5

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