(Swift 3,4,5...) 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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func chilkatTest() {
    // This requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let http = CkoHttp()!

    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"

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

    var success: Bool = http.s3_DownloadFile(bucketName, objectName: objectName, localFilePath: localFilePath)
    if success != true {
        print("\(http.lastErrorText!)")
        return
    }

    var statusCode: Int = http.lastStatus.intValue
    if statusCode != 200 {
        print("Failed to download, response status code = \(statusCode)")
        return
    }

    var jsonPath: String? = "qa_output/cloudTrailLog.json"
    let gzip = CkoGzip()!
    success = gzip.uncompressFile(localFilePath, destPath: jsonPath)
    if success == false {
        print("\(gzip.lastErrorText!)")
        return
    }

    let json = CkoJsonObject()!
    json.loadFile(jsonPath)
    json.emitCompact = false
    print("\(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"
    //     }
    //   ]
    // }

}