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(DataFlex) 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

Use ChilkatAx-9.5.0-win32.pkg

Procedure Test
    Handle hoHttp
    String sBucketName
    String sObjectName
    String sAwsService
    String sHttpVerb
    Integer iNumSecondsValid
    Boolean iBUseHttps
    String sPreSignedUrl
    Variant vResp
    Handle hoResp
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

    // 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.

    Get Create (RefClass(cComChilkatHttp)) To hoHttp
    If (Not(IsComObjectCreated(hoHttp))) Begin
        Send CreateComObject of hoHttp
    End

    Set ComAwsAccessKey Of hoHttp To "AWS_ACCESS_KEY"
    Set ComAwsSecretKey Of hoHttp To "AWS_SECRET_KEY"

    // Make sure to set your AWS region correctly
    Set ComAwsRegion Of hoHttp To "us-east-1"

    Move "chilkat200" To sBucketName
    Move "starfish/starfish.jpg" To sObjectName
    Move "s3" To sAwsService
    Move "PUT" To sHttpVerb

    // The signed URL will be valid for this number of seconds:
    Move 86400 To iNumSecondsValid

    // Choose between a URL beginning with "http://" or "https://"...
    Move False To iBUseHttps

    // Generate the pre-signed URL
    Get ComS3_GenPresignedUrl Of hoHttp sHttpVerb iBUseHttps sBucketName sObjectName iNumSecondsValid sAwsService To sPreSignedUrl
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    // The following URL can be copy-and-pasted into a browser..
    Showln "Presigned URL for Upload: " sPreSignedUrl

    // 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
    // 

    // We can also use the pre-signed URL to upload from Chilkat
    // For example, upload by streaming from a local file
    Get ComPFile Of hoHttp "PUT" sPreSignedUrl "qa_data/jpg/starfish.jpg" "image/jpg" False False To vResp
    If (IsComObject(vResp)) Begin
        Get Create (RefClass(cComChilkatHttpResponse)) To hoResp
        Set pvComObject Of hoResp To vResp
    End
    Get ComLastMethodSuccess Of hoHttp To bTemp1
    If (bTemp1 = False) Begin
        Get ComLastErrorText Of hoHttp To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComStatusCode Of hoResp To iTemp1
    Showln "response status code = " iTemp1
    Get ComContentLength Of hoResp To iTemp1
    Showln "response body size: " iTemp1
    Get ComContentLength Of hoResp To iTemp1
    If (iTemp1 > 0) Begin
        Showln "response body:"
        Get ComBodyStr Of hoResp To sTemp1
        Showln sTemp1
    End

    Send Destroy of hoResp


End_Procedure

 

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