(Lianja) 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.

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

loHttp = createobject("CkHttp")

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

lcBucketName = "chilkat.logs"
lcObjectName = "/AWSLogs/957491831129/CloudTrail/us-west-1/2016/11/12/957491831129_CloudTrail_us-west-1_20161112T1335Z_umXfD4RxHE5nDGuI.json.gz"
lcLocalFilePath = "qa_output/cloudTrailLog.json.gz"

llSuccess = loHttp.S3_DownloadFile(lcBucketName,lcObjectName,lcLocalFilePath)
if (llSuccess <> .T.) then
    ? loHttp.LastErrorText
    release loHttp
    return
endif

lnStatusCode = loHttp.LastStatus
if (lnStatusCode <> 200) then
    ? "Failed to download, response status code = " + str(lnStatusCode)
    release loHttp
    return
endif

lcJsonPath = "qa_output/cloudTrailLog.json"
loGzip = createobject("CkGzip")
llSuccess = loGzip.UncompressFile(lcLocalFilePath,lcJsonPath)
if (llSuccess = .F.) then
    ? loGzip.LastErrorText
    release loHttp
    release loGzip
    return
endif

loJson = createobject("CkJsonObject")
loJson.LoadFile(lcJsonPath)
loJson.EmitCompact = .F.
? loJson.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"
//     }
//   ]
// }


release loHttp
release loGzip
release loJson