(DataFlex) Google Drive - Resumable Upload

Demonstrates how to do a resumable upload to Google Drive.

For more information, see https://developers.google.com/drive/api/v3/manage-uploads#resumable

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

Use ChilkatAx-win32.pkg

Procedure Test
    Boolean iSuccess
    Handle hoHttp
    Variant vJson
    Handle hoJson
    Variant vResp
    Handle hoResp
    Integer iStatusCode
    Handle hoSbSessionUri
    String sSessionUri
    Variant vReq
    Handle hoReq
    Handle hoUrl
    String sTemp1
    Integer iTemp1
    Boolean bTemp1

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

    Move True To iSuccess

    // This example uses a previously obtained access token having permission for the 
    // Google Drive scope. 
    // See Get Google Drive OAuth2 Access Token

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

    Set ComAuthToken Of hoHttp To "GOOGLE_DRIVE_ACCESS_TOKEN"

    // First we want to initiate the resumable upload.
    // We send a POST to get a session URI, which will be used to upload the file, and resume if needed.

    // Our POST will look like this:

    // POST https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable HTTP/1.1
    // Authorization: Bearer [YOUR_AUTH_TOKEN]          <-- Chilkat automatically adds this header because the AuthToken property was set.
    // Content-Length: 38                               <-- Chilkat will automatically add this header.
    // Content-Type: application/json; charset=UTF-8    <-- This is the type of this POST, and is specified in the call to PostJson3.
    // X-Upload-Content-Type: application/zip           <-- The type of file we'll be uploading
    // X-Upload-Content-Length: 1366807                 <-- The size of the file we'll be uploading
    // 
    // {
    //   "name": "myObject"
    // }

    Send ComSetRequestHeader To hoHttp "X-Upload-Content-Type" "application/zip"
    Send ComSetRequestHeader To hoHttp "X-Upload-Content-Length" "1366807"

    Get Create (RefClass(cComChilkatJsonObject)) To hoJson
    If (Not(IsComObjectCreated(hoJson))) Begin
        Send CreateComObject of hoJson
    End
    Get ComUpdateString Of hoJson "name" "myZip" To iSuccess

    Get pvComObject of hoJson to vJson
    Get ComPostJson3 Of hoHttp "https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable" "application/json" vJson 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 iStatusCode
    If (iStatusCode <> 200) Begin
        Get ComBodyStr Of hoResp To sTemp1
        Showln sTemp1
        Showln "response status = " iStatusCode
        Procedure_Return
    End

    // The session URI is in the "Location" response header:
    Get Create (RefClass(cComChilkatStringBuilder)) To hoSbSessionUri
    If (Not(IsComObjectCreated(hoSbSessionUri))) Begin
        Send CreateComObject of hoSbSessionUri
    End
    Get ComGetHeaderField Of hoResp "Location" To sTemp1
    Get ComAppend Of hoSbSessionUri sTemp1 To iSuccess
    Get ComGetAsString Of hoSbSessionUri To sSessionUri
    Showln "Session URI: " sSessionUri

    Send Destroy of hoResp

    // Here's a sample session URI:  https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable&upload_id=AEnB2UrszR8lDqlo3mtXJw_0rYI_Hi1oVh1NPFcLfoyBq9NcSjk85kFopoZaVEgT38OSmLl0XsObPf4iCSJwHlrOvvIJQ_ckIQ

    // -----------------------------------------------------------------------------
    // The next step is to upload the file using the session URI:

    // We'll send a PUT that looks like this:

    // PUT https://www.googleapis.com/upload/drive/v3/files?uploadType=resumable&upload_id=xa298sd_sdlkj2 HTTP/1.1
    // Content-Length: 1366807
    // Content-Type: application/zip
    // 
    // [BYTES 0-1366806]

    // First remove the X-Upload-Content-Type and X-Upload-Content-Length request headers we specified earlier, so they don't get sent with subsequent requests.
    Send ComClearHeaders To hoHttp

    // Because the file is likely large, we'll use SynchronousRequest which allows to to pass an HTTP request object where the body can be streamed directly from a file.
    Get Create (RefClass(cComChilkatHttpRequest)) To hoReq
    If (Not(IsComObjectCreated(hoReq))) Begin
        Send CreateComObject of hoReq
    End

    Set ComContentType Of hoReq To "application/zip"
    Set ComHttpVerb Of hoReq To "PUT"

    Get Create (RefClass(cComChilkatUrl)) To hoUrl
    If (Not(IsComObjectCreated(hoUrl))) Begin
        Send CreateComObject of hoUrl
    End
    Get ComParseUrl Of hoUrl sSessionUri To iSuccess

    Get ComPathWithQueryParams Of hoUrl To sTemp1
    Set ComPath Of hoReq To sTemp1
    Get ComPathWithQueryParams Of hoUrl To sTemp1
    Showln "Path with Query Param: " sTemp1

    // Specify that the request body is to be streamed directly from a file.
    Get ComStreamBodyFromFile Of hoReq "qa_data/zips/big.zip" To iSuccess
    If (iSuccess = False) Begin
        Get ComLastErrorText Of hoReq To sTemp1
        Showln sTemp1
        Procedure_Return
    End

    Get ComHost Of hoUrl To sTemp1
    Get ComPort Of hoUrl To iTemp1
    Get ComSsl Of hoUrl To bTemp1
    Get pvComObject of hoReq to vReq
    Get ComSynchronousRequest Of hoHttp sTemp1 iTemp1 bTemp1 vReq 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 ComBodyStr Of hoResp To sTemp1
    Showln sTemp1
    Showln "response status = " iStatusCode

    // Sample output:

    // {
    //  "kind": "drive#file",
    //  "id": "1rx20i53eurtkVQ-RT7Ry8Ct85PgPYMET",
    //  "name": "myZip",
    //  "mimeType": "application/zip"
    // }
    // 
    // response status = 200

    Send Destroy of hoResp


End_Procedure