C++

Manage Cloud Storage Bucket Labels

See more Google Cloud Storage Examples

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

#include <CkStringBuilder.h>
#include <CkJsonObject.h>
#include <CkHttp.h>
#include <CkHttpResponse.h>

void ChilkatSample(void)
    {
    bool 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..
    CkStringBuilder sbToken;
    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".
    CkJsonObject json;
    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"

    CkHttp http;
    http.put_AuthToken(sbToken.getAsString());

    http.SetUrlVar("bucket_name","chilkat-ocean");
    const char *url = "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=labels";
    CkHttpResponse resp;
    success = http.HttpJson("PATCH",url,json,"application/json",resp);
    if (success == false) {
        std::cout << http.lastErrorText() << "\r\n";
        return;
    }

    int responseCode = resp.get_StatusCode();
    if (responseCode == 401) {
        std::cout << resp.bodyStr() << "\r\n";
        std::cout << "If invalid credentials, then it is likely the access token expired." << "\r\n";
        std::cout << "Your app should automatically fetch a new access token and re-try." << "\r\n";
        return;
    }

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

    std::cout << "Response code: " << responseCode << "\r\n";
    std::cout << "Response body" << "\r\n";
    std::cout << resp.bodyStr() << "\r\n";

    //  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"
    //   }
    //  }
    }