(VB.NET) Download S3 CloudTrail Log and Un-Gzip

Demonstrates how to download a Amazon CloudTrail log from an S3 bucket. The file in this example is a .json.gz. The file is uncompressed and the JSON parsed.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

' This requires the Chilkat API to have been previously unlocked.
' See Global Unlock Sample for sample code.

Dim http As New Chilkat.Http

http.AwsAccessKey = "AWS_ACCESS_KEY"
http.AwsSecretKey = "AWS_SECRET_KEY"
http.S3Ssl = True
http.AwsRegion = "us-west-2"
http.AwsEndpoint = "s3-us-west-2.amazonaws.com"

Dim bucketName As String = "chilkat.logs"
Dim objectName As String = "/AWSLogs/957491831129/CloudTrail/us-west-1/2016/11/12/957491831129_CloudTrail_us-west-1_20161112T1335Z_umXfD4RxHE5nDGuI.json.gz"
Dim localFilePath As String = "qa_output/cloudTrailLog.json.gz"

Dim success As Boolean = http.S3_DownloadFile(bucketName,objectName,localFilePath)
If (success <> True) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim statusCode As Integer = http.LastStatus
If (statusCode <> 200) Then
    Debug.WriteLine("Failed to download, response status code = " & statusCode)
    Exit Sub
End If


Dim jsonPath As String = "qa_output/cloudTrailLog.json"
Dim gzip As New Chilkat.Gzip
success = gzip.UncompressFile(localFilePath,jsonPath)
If (success = False) Then
    Debug.WriteLine(gzip.LastErrorText)
    Exit Sub
End If


Dim json As New Chilkat.JsonObject
json.LoadFile(jsonPath)
json.EmitCompact = False
Debug.WriteLine(json.Emit())

' Sample JSON is shown below.
' Go to http://tools.chilkat.io/jsonParse.cshtml 
' and copy/paste the JSON into the online tool to generate parsing code.

' {
'   "Records": [
'     {
'       "eventVersion": "1.05",
'       "userIdentity": {
'         "type": "Root",
'         "principalId": "954591834127",
'         "arn": "arn:aws:iam::954591834127:root",
'         "accountId": "954591834127",
'         "accessKeyId": "ASIAJ3DEMXUXI43B6FYQ",
'         "sessionContext": {
'           "attributes": {
'             "mfaAuthenticated": "false",
'             "creationDate": "2016-11-12T13:09:31Z"
'           }
'         }
'       },
'       "eventTime": "2016-11-12T13:34:39Z",
'       "eventSource": "cloudtrail.amazonaws.com",
'       "eventName": "DescribeTrails",
'       "awsRegion": "us-west-1",
'       "sourceIPAddress": "98.228.98.57",
'       "userAgent": "console.amazonaws.com",
'       "requestParameters": {
'         "trailNameList": [
'         ]
'       },
'       "responseElements": null,
'       "requestID": "c2a0376c-a8dc-11e6-89e7-85ac5ce5ee56",
'       "eventID": "eb5afd70-dae1-41f0-82b4-91c3c936d9ba",
'       "eventType": "AwsApiCall",
'       "recipientAccountId": "954591834127"
'     }
'   ]
' }