Is it possible to match this event with an AWS EventBridge pattern? - amazon-web-services

Question

I'm trying to create an EventBridge Event Pattern that matches a CodeBuild state change only when a specific string is present in "phase-context" of one of the objects within the "phases" array.
I've been unable to find an example of how to match a single objects property within an array of objects. Is it possible? I know I could look to match a CodeBuild phases change event instead but want to avoid that if possible.
I have marked in the string I want to match in the example CodeBuild state change event below:
{
"version": "0",
"id": "c030038d-8c4d-6141-9545-00ff7b7153EX",
"detail-type": "CodeBuild Build State Change",
"source": "aws.codebuild",
"account": "123456789012",
"time": "2017-09-01T16:14:28Z",
"region": "us-west-2",
"resources":[
"arn:aws:codebuild:us-west-2:123456789012:build/my-sample-project:8745a7a9-c340-456a-9166-edf953571bEX"
],
"detail":{
"build-status": "SUCCEEDED",
"project-name": "my-sample-project",
"build-id": "arn:aws:codebuild:us-west-2:123456789012:build/my-sample-project:8745a7a9-c340-456a-9166-edf953571bEX",
"additional-information": {
"artifact": {
"md5sum": "da9c44c8a9a3cd4b443126e823168fEX",
"sha256sum": "6ccc2ae1df9d155ba83c597051611c42d60e09c6329dcb14a312cecc0a8e39EX",
"location": "arn:aws:s3:::codebuild-123456789012-output-bucket/my-output-artifact.zip"
},
"environment": {
"image": "aws/codebuild/standard:4.0",
"privileged-mode": false,
"compute-type": "BUILD_GENERAL1_SMALL",
"type": "LINUX_CONTAINER",
"environment-variables": []
},
"timeout-in-minutes": 60,
"build-complete": true,
"initiator": "MyCodeBuildDemoUser",
"build-start-time": "Sep 1, 2017 4:12:29 PM",
"source": {
"location": "codebuild-123456789012-input-bucket/my-input-artifact.zip",
"type": "S3"
},
"logs": {
"group-name": "/aws/codebuild/my-sample-project",
"stream-name": "8745a7a9-c340-456a-9166-edf953571bEX",
"deep-link": "https://console.aws.amazon.com/cloudwatch/home?region=us-west-2#logEvent:group=/aws/codebuild/my-sample-project;stream=8745a7a9-c340-456a-9166-edf953571bEX"
},
"phases": [
{
"phase-context": [],
"start-time": "Sep 1, 2017 4:12:29 PM",
"end-time": "Sep 1, 2017 4:12:29 PM",
"duration-in-seconds": 0,
"phase-type": "SUBMITTED",
"phase-status": "SUCCEEDED"
},
{
"phase-context": [],
"start-time": "Sep 1, 2017 4:12:29 PM",
"end-time": "Sep 1, 2017 4:13:05 PM",
"duration-in-seconds": 36,
"phase-type": "PROVISIONING",
"phase-status": "SUCCEEDED"
},
{
"phase-context": [],
"start-time": "Sep 1, 2017 4:13:05 PM",
"end-time": "Sep 1, 2017 4:13:10 PM",
"duration-in-seconds": 4,
"phase-type": "DOWNLOAD_SOURCE",
"phase-status": "SUCCEEDED"
},
{
"phase-context": [],
"start-time": "Sep 1, 2017 4:13:10 PM",
"end-time": "Sep 1, 2017 4:13:10 PM",
"duration-in-seconds": 0,
"phase-type": "INSTALL",
"phase-status": "SUCCEEDED"
},
{
"phase-context": [],
"start-time": "Sep 1, 2017 4:13:10 PM",
"end-time": "Sep 1, 2017 4:13:10 PM",
"duration-in-seconds": 0,
"phase-type": "PRE_BUILD",
"phase-status": "SUCCEEDED"
},
{
"phase-context": [
"something here" <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<< THIS STRING
],
"start-time": "Sep 1, 2017 4:13:10 PM",
"end-time": "Sep 1, 2017 4:14:21 PM",
"duration-in-seconds": 70,
"phase-type": "BUILD",
"phase-status": "SUCCEEDED"
},
{
"phase-context": [],
"start-time": "Sep 1, 2017 4:14:21 PM",
"end-time": "Sep 1, 2017 4:14:21 PM",
"duration-in-seconds": 0,
"phase-type": "POST_BUILD",
"phase-status": "SUCCEEDED"
},
{
"phase-context": [],
"start-time": "Sep 1, 2017 4:14:21 PM",
"end-time": "Sep 1, 2017 4:14:21 PM",
"duration-in-seconds": 0,
"phase-type": "UPLOAD_ARTIFACTS",
"phase-status": "SUCCEEDED"
},
{
"phase-context": [],
"start-time": "Sep 1, 2017 4:14:21 PM",
"end-time": "Sep 1, 2017 4:14:26 PM",
"duration-in-seconds": 4,
"phase-type": "FINALIZING",
"phase-status": "SUCCEEDED"
},
{
"start-time": "Sep 1, 2017 4:14:26 PM",
"phase-type": "COMPLETED"
}
]
},
"current-phase": "COMPLETED",
"current-phase-context": "[]",
"version": "1"
}
}

Answer 1

EventBridge supports value matches within array (https://docs.aws.amazon.com/eventbridge/latest/userguide/arrays-in-eventbridge-event-patterns.html). I'm not certain but AFAIK it doesn't support patterns within an array. To be sure, I'd recommend trying out the filters specified in https://docs.aws.amazon.com/eventbridge/latest/userguide/content-filtering-with-event-patterns.html within a rule pattern.
If this fails, you would need to setup a lambda (or fargate / ec2) to transform the input before calling put-events again.