(Mono C#) Create S3 Pre-Signed URL for Upload

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

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// 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.

Chilkat.Http http = new Chilkat.Http();

http.AwsAccessKey = "AWS_ACCESS_KEY";
http.AwsSecretKey = "AWS_SECRET_KEY";

// Make sure to set your AWS region correctly
http.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://"...
bool bUseHttps = false;

// Generate the pre-signed URL
string preSignedUrl = http.S3_GenPresignedUrl(httpVerb,bUseHttps,bucketName,objectName,numSecondsValid,awsService);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("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
Chilkat.HttpResponse resp = http.PFile("PUT",preSignedUrl,"qa_data/jpg/starfish.jpg","image/jpg",false,false);
if (http.LastMethodSuccess == false) {
    Debug.WriteLine(http.LastErrorText);
    return;
}

Debug.WriteLine("response status code = " + Convert.ToString(resp.StatusCode));
Debug.WriteLine("response body size: " + Convert.ToString((int) resp.ContentLength));
if ((int) resp.ContentLength > 0) {
    Debug.WriteLine("response body:");
    Debug.WriteLine(resp.BodyStr);
}