(Lianja) Manage Cloud Storage Bucket Labels

See more Google Cloud Storage Examples

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

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// 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..
loSbToken = createobject("CkStringBuilder")
loSbToken.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".
loJson = createobject("CkJsonObject")
loJson.UpdateString("labels.b","bbb")
loJson.UpdateString("labels.test","abc123")
loJson.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"

loHttp = createobject("CkHttp")
loHttp.AuthToken = loSbToken.GetAsString()

loHttp.SetUrlVar("bucket_name","chilkat-ocean")
lcUrl = "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=labels"
loResp = loHttp.PText("PATCH",lcUrl,loJson.Emit(),"utf-8","application/json",.F.,.F.)
if (loHttp.LastMethodSuccess = .F.) then
    ? loHttp.LastErrorText
    release loSbToken
    release loJson
    release loHttp
    return
endif

lnResponseCode = loResp.StatusCode
if (lnResponseCode = 401) then
    ? loResp.BodyStr
    ? "If invalid credentials, then it is likely the access token expired."
    ? "Your app should automatically fetch a new access token and re-try."
    release loResp
    release loSbToken
    release loJson
    release loHttp
    return
endif

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

? "Response code: " + str(lnResponseCode)
? "Response body"
? loResp.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"
//  }
// }

release loResp


release loSbToken
release loJson
release loHttp