Xojo Plugin

Manage Cloud Storage Bucket Labels

See more Google Cloud Storage Examples

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

Dim success As Boolean
success = False

// 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
success = 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
success = json.UpdateString("labels.b","bbb")
success = json.UpdateString("labels.test","abc123")
success = 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()

success = http.SetUrlVar("bucket_name","chilkat-ocean")
Dim url As String
url = "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=labels"
Dim resp As New Chilkat.HttpResponse
success = http.HttpJson("PATCH",url,json,"application/json",resp)
If (success = False) Then
    System.DebugLog(http.LastErrorText)
    Return
End If

Dim responseCode As Int32
responseCode = resp.StatusCode
If (responseCode = 401) Then
    System.DebugLog(resp.BodyStr)
    System.DebugLog("If invalid credentials, then it is likely the access token expired.")
    System.DebugLog("Your app should automatically fetch a new access token and re-try.")
    Return
End If

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

System.DebugLog("Response code: " + Str(responseCode))
System.DebugLog("Response body")
System.DebugLog(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"
//  }
// }