(MFC) 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 C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkHttp.h>
#include <CkGzip.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkHttp http;

    http.put_AwsAccessKey("AWS_ACCESS_KEY");
    http.put_AwsSecretKey("AWS_SECRET_KEY");
    http.put_S3Ssl(true);
    http.put_AwsRegion("us-west-2");
    http.put_AwsEndpoint("s3-us-west-2.amazonaws.com");

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

    bool success = http.S3_DownloadFile(bucketName,objectName,localFilePath);
    if (success != true) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    int statusCode = http.get_LastStatus();
    if (statusCode != 200) {
        strOut.append("Failed to download, response status code = ");
        strOut.appendInt(statusCode);
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    const char *jsonPath = "qa_output/cloudTrailLog.json";
    CkGzip gzip;
    success = gzip.UncompressFile(localFilePath,jsonPath);
    if (success == false) {
        strOut.append(gzip.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    CkJsonObject json;
    json.LoadFile(jsonPath);
    json.put_EmitCompact(false);
    strOut.append(json.emit());
    strOut.append("\r\n");

    // 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"
    //     }
    //   ]
    // }


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }