(Xojo Plugin) Lower-Level REST API Methods (Google Cloud Storage)

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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// This example demonstrates a REST call using SendReqStringBody, ReadResonseHeader, and ReadRespBodyString.
// It will create a bucket in Google Cloud Storage.
Dim success As Boolean

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

Dim gAuth As New 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

Dim rest As New Chilkat.Rest

// Connect using TLS.
Dim bAutoReconnect As Boolean
bAutoReconnect = True
success = rest.Connect("www.googleapis.com",443,True,bAutoReconnect)

// Provide the authentication credentials (i.e. the access key)
success = rest.SetAuthGoogle(gAuth)

// 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..
Dim jsonReqBody As New Chilkat.JsonObject
success = jsonReqBody.AddStringAt(-1,"name","chilkat-bucket-c")
success = jsonReqBody.AddStringAt(-1,"kind","storage#bucket")
success = jsonReqBody.AddStringAt(-1,"location","US")
success = jsonReqBody.AddObjectAt(-1,"versioning")

Dim pObjVersioning As Chilkat.JsonObject
pObjVersioning = jsonReqBody.ObjectOf("versioning")
success = pObjVersioning.AddBoolAt(-1,"enabled",True)

// Show the HTTP request body we'll be sending.
System.DebugLog(jsonReqBody.Emit())

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

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

// Send the REST HTTP request.
success = rest.SendReqStringBody("POST","/storage/v1/b",jsonReqBody.Emit())
If (success <> True) Then
    System.DebugLog(rest.LastErrorText)
    Return
End If

// Read the response header.
Dim responseStatusCode As Int32
responseStatusCode = rest.ReadResponseHeader()
If (responseStatusCode < 0) Then
    // We were unable to receive the response header.
    System.DebugLog(rest.LastErrorText)
    Return
End If

If (responseStatusCode <> 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:
    System.DebugLog("Response status text: " + rest.ResponseStatusText)
    System.DebugLog("Response header: " + rest.ResponseHeader)
End If

// Read the response body.  In this case we're expecting it to be JSON..
Dim responseBodyStr As String
responseBodyStr = rest.ReadRespBodyString()
If (rest.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.
    System.DebugLog(rest.LastErrorText)
    Return
End If

// Show the JSON response.
System.DebugLog("Json Response: " + responseBodyStr)