Go

Manage Cloud Storage Bucket Labels

See more Google Cloud Storage Examples

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

    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..
    sbToken := chilkat.NewStringBuilder()
    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".
    json := chilkat.NewJsonObject()
    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"

    http := chilkat.NewHttp()
    http.SetAuthToken(sbToken.GetAsString())

    http.SetUrlVar("bucket_name","chilkat-ocean")
    url := "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=labels"
    resp := chilkat.NewHttpResponse()
    success = http.HttpJson("PATCH",url,json,"application/json",resp)
    if success == false {
        fmt.Println(http.LastErrorText())
        sbToken.DisposeStringBuilder()
        json.DisposeJsonObject()
        http.DisposeHttp()
        resp.DisposeHttpResponse()
        return
    }

    responseCode := resp.StatusCode()
    if responseCode == 401 {
        fmt.Println(resp.BodyStr())
        fmt.Println("If invalid credentials, then it is likely the access token expired.")
        fmt.Println("Your app should automatically fetch a new access token and re-try.")
        sbToken.DisposeStringBuilder()
        json.DisposeJsonObject()
        http.DisposeHttp()
        resp.DisposeHttpResponse()
        return
    }

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

    fmt.Println("Response code: ", responseCode)
    fmt.Println("Response body")
    fmt.Println(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"
    //  }
    // }

    sbToken.DisposeStringBuilder()
    json.DisposeJsonObject()
    http.DisposeHttp()
    resp.DisposeHttpResponse()