(Java) Create S3 Pre-Signed URL for Upload

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

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    // 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 = new CkHttp();

    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");

    String bucketName = "chilkat200";
    String objectName = "starfish/starfish.jpg";
    String awsService = "s3";
    String 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://"...
    boolean bUseHttps = false;

    // Generate the pre-signed URL
    String preSignedUrl = http.s3_GenPresignedUrl(httpVerb,bUseHttps,bucketName,objectName,numSecondsValid,awsService);
    if (http.get_LastMethodSuccess() == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    System.out.println("Presigned URL for Upload: " + preSignedUrl);

    // 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
    // 

    // You can 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) {
        System.out.println(http.lastErrorText());
        return;
        }

    System.out.println("response status code = " + resp.get_StatusCode());
    System.out.println("response body size: " + resp.get_ContentLength());
    if (resp.get_ContentLength() > 0) {
        System.out.println("response body:");
        System.out.println(resp.bodyStr());
        }
  }
}