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Lower-Level REST API Methods (Google Cloud Storage)

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The FullRequest* methods, such as FullRequestBinary, FullRequestMultipart, FullRequestNoBody, FullRequestStream, FullRequestString, etc. are high-level REST API methods that both send the request and receive the response. It is often the case that an application needs make a REST call, but with a finer level of control. The Chilkat REST API provides this feature. An application can break a REST call into the following parts:

1. Send the HTTP request. (via the SendReq* methods)
2. Receive the HTTP response header. (ReadResponseHeader)
3. Receive the HTTP response body. (via the ReadRespBody* methods)

This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.

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Local $bSuccess = False

; This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.
; It will create a bucket in Google Cloud Storage.

; It requires the Chilkat API to have been previously unlocked.
; See Global Unlock Sample for sample code.

$oGAuth = ObjCreate("Chilkat.AuthGoogle")
; Obtain an access token as shown in one of the following examples:
; See Get Access Token using a Service Account JSON Key
; See Get Access Token using a P12 File

$oRest = ObjCreate("Chilkat.Rest")

; Connect using TLS.
Local $bAutoReconnect = True
$bSuccess = $oRest.Connect("www.googleapis.com",443,True,$bAutoReconnect)

; Provide the authentication credentials (i.e. the access key)
$bSuccess = $oRest.SetAuthGoogle($oGAuth)

; Build the JSON request body for creating a bucket.
; The only required property is the "name", but we'll add more
; to make a better example..
$oJsonReqBody = ObjCreate("Chilkat.JsonObject")
$bSuccess = $oJsonReqBody.AddStringAt(-1,"name","chilkat-bucket-c")
$bSuccess = $oJsonReqBody.AddStringAt(-1,"kind","storage#bucket")
$bSuccess = $oJsonReqBody.AddStringAt(-1,"location","US")

$oObjVersioning = ObjCreate("Chilkat.JsonObject")
$oJsonReqBody.AppendObject2("versioning",$oObjVersioning)
$bSuccess = $oObjVersioning.AddBoolAt(-1,"enabled",True)

; Show the HTTP request body we'll be sending.
ConsoleWrite($oJsonReqBody.Emit() & @CRLF)

; Add the required query parameter.
; See https://cloud.google.com/storage/docs/json_api/v1/buckets/insert
$bSuccess = $oRest.AddQueryParam("project","chilkattest-1050")

; Add the Content-Type HTTP request header.
$bSuccess = $oRest.AddHeader("Content-Type","application/json; charset=UTF-8")

; Send the REST HTTP request.
$bSuccess = $oRest.SendReqStringBody("POST","/storage/v1/b",$oJsonReqBody.Emit())
If ($bSuccess = False) Then
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

; Read the response header.
Local $iResponseStatusCode = $oRest.ReadResponseHeader()
If ($iResponseStatusCode < 0) Then
    ; We were unable to receive the response header.
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

If ($iResponseStatusCode <> 200) Then
    ; The response was not successful.  We'll still need to receive 
    ; the response body, which may contain an error message from the server.
    ; If the response has no body, then the method for reading the
    ; response body can still be called.  It will simply return with an empty
    ; response body.

    ; We can examine the response header and status text:
    ConsoleWrite("Response status text: " & $oRest.ResponseStatusText & @CRLF)
    ConsoleWrite("Response header: " & $oRest.ResponseHeader & @CRLF)
EndIf

; Read the response body.  In this case we're expecting it to be JSON..
Local $sResponseBodyStr = $oRest.ReadRespBodyString()
If ($oRest.LastMethodSuccess <> True) Then
    ; We were unable to receive the response body.
    ; Note: If the response did not include a body (such as for cases where
    ; the Content-Length header is 0, or if the response status code implicitly
    ; indicates no body, then ReadRespBodyString returns cktrue, and the
    ; responseBodyString will be an empty string.
    ConsoleWrite($oRest.LastErrorText & @CRLF)
    Exit
EndIf

; Show the JSON response.
ConsoleWrite("Json Response: " & $sResponseBodyStr & @CRLF)