(VB.NET) Manage Cloud Storage Bucket Labels

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Demonstrates how to add, update, and delete labels for a Cloud Storage bucket.

Chilkat .NET Downloads Chilkat .NET Framework Chilkat for .NET Core

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

' This example uses a previously obtained access token having permission for the 
' scope "https://www.googleapis.com/auth/cloud-platform"

' In this example, Get Google Cloud Storage OAuth2 Access Token, 
' the service account access token was saved to a text file.  This example fetches the access token from the file..
Dim sbToken As New Chilkat.StringBuilder
sbToken.LoadFile("qa_data/tokens/googleCloudStorageAccessToken.txt","utf-8")

' ---- Step 1
' Create the JSON body of the PATCH request that will be sent.
' This specifies labels to be added, updated, and/or deleted.
' (To delete a label, set its value equal to null.)

' {
'   "labels": {
'     "new_label_key": "new_label_value",
'     "existing_label_key": "updated_label_value",
'     "old_label_key": null
'   }
' }


' ---------
' Important
' ---------
' You can apply multiple labels to each bucket, with a maximum of 64 labels per bucket.

'     - Keys and values cannot be longer than 63 characters each.
'     - Keys and values can only contain lowercase letters, numeric characters, underscores, and dashes. International characters are allowed.
'     - Label keys must start with a lowercase letter and international characters are allowed.
'     - Label keys cannot be empty.


' Build JSON to update labels.
' 
' During the testing of this example, my bucket already has the following labels:
' {
'  "labels": {
'   "test1": "xyz",
'   "test": "abc",
'   "a": "abc"
'  }
' }

' For this example, I'm going to add a label "b", delete the label "test1", and update
' the label "test".
Dim json As New Chilkat.JsonObject
json.UpdateString("labels.b","bbb")
json.UpdateString("labels.test","abc123")
json.UpdateNull("labels.test1")

' ---- Step 2
' Send a PATCH equivalent to this curl command

' curl -X PATCH --data-binary @[JSON_FILE_NAME].json \
'     -H "Authorization: Bearer [OAUTH2_TOKEN]" \
'     -H "Content-Type: application/json" \
'     "https://www.googleapis.com/storage/v1/b/[BUCKET_NAME]?fields=labels"

Dim http As New Chilkat.Http
http.AuthToken = sbToken.GetAsString()

http.SetUrlVar("bucket_name","chilkat-ocean")
Dim url As String = "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=labels"
Dim resp As Chilkat.HttpResponse = http.PText("PATCH",url,json.Emit(),"utf-8","application/json",False,False)
If (http.LastMethodSuccess = False) Then
    Debug.WriteLine(http.LastErrorText)
    Exit Sub
End If


Dim responseCode As Integer = resp.StatusCode
If (responseCode = 401) Then
    Debug.WriteLine(resp.BodyStr)
    Debug.WriteLine("If invalid credentials, then it is likely the access token expired.")
    Debug.WriteLine("Your app should automatically fetch a new access token and re-try.")

    Exit Sub
End If


' Note: A 400 response code is likely caused by illegal characters used for a label name and/or value.

Debug.WriteLine("Response code: " & responseCode)
Debug.WriteLine("Response body")
Debug.WriteLine(resp.BodyStr)

' A response code = 200 indicates success, and the response body contains the JSON
' for the new/updated set of labels
' Response code: 200
' Response body
' {
'  "labels": {
'   "test": "abc123",
'   "a": "abc",
'   "b": "bbb"
'  }
' }