(Visual FoxPro) Create S3 Pre-Signed URL for Upload

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

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

LOCAL loHttp
LOCAL lcBucketName
LOCAL lcObjectName
LOCAL lcAwsService
LOCAL lcHttpVerb
LOCAL lnNumSecondsValid
LOCAL lnBUseHttps
LOCAL lcPreSignedUrl
LOCAL loResp

* 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.

* For versions of Chilkat < 10.0.0, use CreateObject('Chilkat_9_5_0.Http')
loHttp = CreateObject('Chilkat.Http')

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://"...
lnBUseHttps = 0

* Generate the pre-signed URL
lcPreSignedUrl = loHttp.S3_GenPresignedUrl(lcHttpVerb,lnBUseHttps,lcBucketName,lcObjectName,lnNumSecondsValid,lcAwsService)
IF (loHttp.LastMethodSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    CANCEL
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 = loHttp.PFile("PUT",lcPreSignedUrl,"qa_data/jpg/starfish.jpg","image/jpg",0,0)
IF (loHttp.LastMethodSuccess = 0) THEN
    ? loHttp.LastErrorText
    RELEASE loHttp
    CANCEL
ENDIF

? "response status code = " + STR(loResp.StatusCode)
? "response body size: " + STR(loResp.ContentLength)
IF (loResp.ContentLength > 0) THEN
    ? "response body:"
    ? loResp.BodyStr
ENDIF

RELEASE loResp

RELEASE loHttp