(PureBasic) Create S3 Pre-Signed URL for Upload

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

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"

Procedure ChilkatExample()

    ; 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.

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttp::setCkAwsAccessKey(http, "AWS_ACCESS_KEY")
    CkHttp::setCkAwsSecretKey(http, "AWS_SECRET_KEY")

    ; Make sure to set your AWS region correctly
    CkHttp::setCkAwsRegion(http, "us-east-1")

    bucketName.s = "chilkat200"
    objectName.s = "starfish/starfish.jpg"
    awsService.s = "s3"
    httpVerb.s = "PUT"

    ; The signed URL will be valid for this number of seconds:
    numSecondsValid.i = 86400

    ; Choose between a URL beginning with "http://" or "https://"...
    bUseHttps.i = 0

    ; Generate the pre-signed URL
    preSignedUrl.s = CkHttp::ckS3_GenPresignedUrl(http,httpVerb,bUseHttps,bucketName,objectName,numSecondsValid,awsService)
    If CkHttp::ckLastMethodSuccess(http) = 0
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    Debug "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
    resp.i = CkHttp::ckPFile(http,"PUT",preSignedUrl,"qa_data/jpg/starfish.jpg","image/jpg",0,0)
    If CkHttp::ckLastMethodSuccess(http) = 0
        Debug CkHttp::ckLastErrorText(http)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    Debug "response status code = " + Str(CkHttpResponse::ckStatusCode(resp))
    Debug "response body size: " + Str(CkHttpResponse::ckContentLength(resp))
    If CkHttpResponse::ckContentLength(resp) > 0
        Debug "response body:"
        Debug CkHttpResponse::ckBodyStr(resp)
    EndIf

    CkHttpResponse::ckDispose(resp)



    CkHttp::ckDispose(http)


    ProcedureReturn
EndProcedure