(Unicode C) Generate an AWS (S3) Pre-Signed URL using Signature V4

Demonstrates how to generate a pre-signed URL using AWS Signature Version 4. This example generates a pre-signed URL for the Amazon S3 service.

Note: this example requires Chilkat v9.5.0.66 or greater.

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#include <C_CkHttpW.h>

void ChilkatSample(void)
    {
    HCkHttpW http;
    const wchar_t *bucketName;
    const wchar_t *objectName;
    const wchar_t *localFilePath;
    const wchar_t *awsService;
    int numSecondsValid;
    BOOL bUseHttps;
    const wchar_t *preSignedUrl;
    BOOL success;

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

    // Note: This example requires Chilkat v9.5.0.66 or greater.

    http = CkHttpW_Create();

    CkHttpW_putAwsAccessKey(http,L"AWS_ACCESS_KEY");
    CkHttpW_putAwsSecretKey(http,L"AWS_SECRET_KEY");

    // Make sure to set your AWS region correctly
    CkHttpW_putAwsRegion(http,L"us-east-1");

    bucketName = L"chilkat100";
    objectName = L"starfish/starfish.jpg";
    localFilePath = L"qa_output/starfish.jpg";
    awsService = L"s3";

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

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

    // Generate the pre-signed URL
    preSignedUrl = CkHttpW_s3_GenerateUrlV4(http,bUseHttps,bucketName,objectName,numSecondsValid,awsService);
    if (CkHttpW_getLastMethodSuccess(http) != TRUE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkHttpW_Dispose(http);
        return;
    }

    // The following URL can be copy-and-pasted into a browser..
    wprintf(L"Pre-Signed AWS S3 URL: %s\n",preSignedUrl);

    // Here's an example of a pre-signed URL. 
    // This URL will only work within 1 day (86400 seconds) after the time this example was published.
    // 
    //     http://chilkat100.s3.amazonaws.com/starfish/starfish.jpg?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Credential=16QXXDGY83AJJR6RVQ02%2F20170111%2Fus-west-2%2Fs3%2Faws4_request&X-Amz-Date=20170111T161959Z&X-Amz-Expires=86400&X-Amz-SignedHeaders=host&X-Amz-Signature=72bf4fd9a15d7bbcdd313a3318d937a778905f62a3fbff9b789d8dc28acd9232

    // Now try to do an HTTP Download using the signed URL.
    success = CkHttpW_Download(http,preSignedUrl,L"qa_output/starfish.jpg");
    if (success != TRUE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
    }
    else {
        wprintf(L"Success.\n");
    }



    CkHttpW_Dispose(http);

    }