Lianja Requires Chilkat v11.0.0+
Create S3 Pre-Signed URL for Upload

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

Lianja
llSuccess = .F.

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

loHttp = createobject("CkHttp")

loHttp.AwsAccessKey = "AWS_ACCESS_KEY"
loHttp.AwsSecretKey = "AWS_SECRET_KEY"

//  Make sure to set your AWS region correctly
loHttp.AwsRegion = "us-east-1"

lcBucketName = "chilkat200"
lcObjectName = "starfish/starfish.jpg"
lcAwsService = "s3"
lcHttpVerb = "PUT"

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

//  Choose between a URL beginning with "http://" or "https://"...
llBUseHttps = .T.

//  Generate the pre-signed URL
lcPreSignedUrl = loHttp.S3_GenPresignedUrl(lcHttpVerb,llBUseHttps,lcBucketName,lcObjectName,lnNumSecondsValid,lcAwsService)
if (loHttp.LastMethodSuccess = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    return
endif

? "Presigned URL for Upload: " + lcPreSignedUrl

//  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
loResp = createobject("CkHttpResponse")
llSuccess = loHttp.HttpFile("PUT",lcPreSignedUrl,"qa_data/jpg/starfish.jpg","image/jpg",loResp)
if (llSuccess = .F.) then
    ? loHttp.LastErrorText
    release loHttp
    release loResp
    return
endif

? "response status code = " + str(loResp.StatusCode)
? "response body size: " + str(loResp.ContentLength)
if (loResp.ContentLength > 0) then
    ? "response body:"
    ? loResp.BodyStr
endif



release loHttp
release loResp