(Objective-C) 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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#import <CkoHttp.h>
#import <NSString.h>
#import <CkoGzip.h>
#import <CkoJsonObject.h>

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

CkoHttp *http = [[CkoHttp alloc] init];

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

NSString *bucketName = @"chilkat.logs";
NSString *objectName = @"/AWSLogs/957491831129/CloudTrail/us-west-1/2016/11/12/957491831129_CloudTrail_us-west-1_20161112T1335Z_umXfD4RxHE5nDGuI.json.gz";
NSString *localFilePath = @"qa_output/cloudTrailLog.json.gz";

BOOL success = [http S3_DownloadFile: bucketName objectName: objectName localFilePath: localFilePath];
if (success != YES) {
    NSLog(@"%@",http.LastErrorText);
    return;
}

int statusCode = [http.LastStatus intValue];
if (statusCode != 200) {
    NSLog(@"%@%d",@"Failed to download, response status code = ",statusCode);
    return;
}

NSString *jsonPath = @"qa_output/cloudTrailLog.json";
CkoGzip *gzip = [[CkoGzip alloc] init];
success = [gzip UncompressFile: localFilePath destPath: jsonPath];
if (success == NO) {
    NSLog(@"%@",gzip.LastErrorText);
    return;
}

CkoJsonObject *json = [[CkoJsonObject alloc] init];
[json LoadFile: jsonPath];
json.EmitCompact = NO;
NSLog(@"%@",[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"
//     }
//   ]
// }