Xbase++ Requires Chilkat v11.0.0+

Generate an AWS (S3) Pre-Signed URL to Download File

See more Amazon S3 (new) Examples

Demonstrates how to generate a pre-signed URL to download a file from the Amazon S3 service. Xbase++

LOCAL nSuccess
LOCAL oHttp
LOCAL cBucketName
LOCAL cObjectName
LOCAL cLocalFilePath
LOCAL cAwsService
LOCAL nNumSecondsValid
LOCAL nBUseHttps
LOCAL cPreSignedUrl

nSuccess := 0

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

oHttp := CreateObject("Chilkat.Http")

oHttp:AwsAccessKey := "AWS_ACCESS_KEY"
oHttp:AwsSecretKey := "AWS_SECRET_KEY"

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

cBucketName := "chilkat100"
cObjectName := "starfish/starfish.jpg"
cLocalFilePath := "qa_output/starfish.jpg"
cAwsService := "s3"

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

//  Choose between a URL beginning with "http://" or "https://"...
nBUseHttps := 0

//  Generate the pre-signed URL
cPreSignedUrl := oHttp:S3_GenPresignedUrl("GET", nBUseHttps, cBucketName, cObjectName, nNumSecondsValid, cAwsService)
IF (oHttp:LastMethodSuccess == 0)
    ? oHttp:LastErrorText
    oHttp:destroy()
    RETURN
ENDIF

//  The following URL can be copy-and-pasted into a browser..
? "Pre-Signed AWS S3 URL: " + cPreSignedUrl

//  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.
nSuccess := oHttp:Download(cPreSignedUrl, "c:/temp/qa_output/starfish.jpg")
IF (nSuccess == 0)
    ? oHttp:LastErrorText
    oHttp:destroy()
    RETURN
ENDIF

? "Success."

oHttp:destroy()