(MFC) Create S3 Pre-Signed URL for Upload

Demonstrates how to generate a pre-signed URL for S3 uploads.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkHttp.h>
#include <CkHttpResponse.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    // Note: This example requires Chilkat v9.5.0.83 or greater.

    CkHttp http;

    http.put_AwsAccessKey("AWS_ACCESS_KEY");
    http.put_AwsSecretKey("AWS_SECRET_KEY");

    // Make sure to set your AWS region correctly
    http.put_AwsRegion("us-east-1");

    const char *bucketName = "chilkat200";
    const char *objectName = "starfish/starfish.jpg";
    const char *awsService = "s3";
    const char *httpVerb = "PUT";

    // The signed URL will be valid for this number of seconds:
    int numSecondsValid = 86400;

    // Choose between a URL beginning with "http://" or "https://"...
    bool bUseHttps = false;

    // Generate the pre-signed URL
    const char *preSignedUrl = http.s3_GenPresignedUrl(httpVerb,bUseHttps,bucketName,objectName,numSecondsValid,awsService);
    if (http.get_LastMethodSuccess() == false) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // The following URL can be copy-and-pasted into a browser..
    strOut.append("Presigned URL for Upload: ");
    strOut.append(preSignedUrl);
    strOut.append("\r\n");

    // Here's an example of a pre-signed URL
    // 
    // http://chilkat200.s3.amazonaws.com/starfish/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=AKIAIBJLOVZVXAU2AFUA%2F20200623%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20200623T234049Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=xxxxxeaea071178d772856c0a4e4c0114a8d9992f0d0812955e490d0exxxxxxx
    // 

    // We can also use the pre-signed URL to upload from Chilkat
    // For example, upload by streaming from a local file
    CkHttpResponse *resp = http.PFile("PUT",preSignedUrl,"qa_data/jpg/starfish.jpg","image/jpg",false,false);
    if (http.get_LastMethodSuccess() == false) {
        strOut.append(http.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("response status code = ");
    strOut.appendInt(resp->get_StatusCode());
    strOut.append("\r\n");
    strOut.append("response body size: ");
    strOut.appendInt(resp->get_ContentLength());
    strOut.append("\r\n");
    if (resp->get_ContentLength() > 0) {
        strOut.append("response body:");
        strOut.append("\r\n");
        strOut.append(resp->bodyStr());
        strOut.append("\r\n");
    }

    delete resp;


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }