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Tcl Examples

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(Tcl) Manage Cloud Storage Bucket Labels

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

Chilkat Tcl Extension Downloads

Chilkat Tcl Extension Downloads

load ./chilkat.dll

#  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..
set sbToken [new_CkStringBuilder]

CkStringBuilder_LoadFile $sbToken "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".
set json [new_CkJsonObject]

CkJsonObject_UpdateString $json "labels.b" "bbb"
CkJsonObject_UpdateString $json "labels.test" "abc123"
CkJsonObject_UpdateNull $json "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"

set http [new_CkHttp]

CkHttp_put_AuthToken $http [CkStringBuilder_getAsString $sbToken]

CkHttp_SetUrlVar $http "bucket_name" "chilkat-ocean"
set url "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=labels"
# resp is a CkHttpResponse
set resp [CkHttp_PText $http "PATCH" $url [CkJsonObject_emit $json] "utf-8" "application/json" 0 0]
if {[expr [CkHttp_get_LastMethodSuccess $http] == 0]} then {
    puts [CkHttp_lastErrorText $http]
    delete_CkStringBuilder $sbToken
    delete_CkJsonObject $json
    delete_CkHttp $http
    exit
}

set responseCode [CkHttpResponse_get_StatusCode $resp]
if {[expr $responseCode == 401]} then {
    puts [CkHttpResponse_bodyStr $resp]
    puts "If invalid credentials, then it is likely the access token expired."
    puts "Your app should automatically fetch a new access token and re-try."
    delete_CkHttpResponse $resp

    delete_CkStringBuilder $sbToken
    delete_CkJsonObject $json
    delete_CkHttp $http
    exit
}

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

puts "Response code: $responseCode"
puts "Response body"
puts [CkHttpResponse_bodyStr $resp]

#  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"
#   }
#  }

delete_CkHttpResponse $resp


delete_CkStringBuilder $sbToken
delete_CkJsonObject $json
delete_CkHttp $http

 

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