(Unicode C) Manage Cloud Storage Bucket Labels

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

Chilkat C/C++ Library Downloads
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#include <C_CkStringBuilderW.h>
#include <C_CkJsonObjectW.h>
#include <C_CkHttpW.h>
#include <C_CkHttpResponseW.h>

void ChilkatSample(void)
    {
    HCkStringBuilderW sbToken;
    HCkJsonObjectW json;
    HCkHttpW http;
    const wchar_t *url;
    HCkHttpResponseW resp;
    int responseCode;

    // 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 = CkStringBuilderW_Create();
    CkStringBuilderW_LoadFile(sbToken,L"qa_data/tokens/googleCloudStorageAccessToken.txt",L"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 = CkJsonObjectW_Create();
    CkJsonObjectW_UpdateString(json,L"labels.b",L"bbb");
    CkJsonObjectW_UpdateString(json,L"labels.test",L"abc123");
    CkJsonObjectW_UpdateNull(json,L"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 = CkHttpW_Create();
    CkHttpW_putAuthToken(http,CkStringBuilderW_getAsString(sbToken));

    CkHttpW_SetUrlVar(http,L"bucket_name",L"chilkat-ocean");
    url = L"https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=labels";
    resp = CkHttpW_PText(http,L"PATCH",url,CkJsonObjectW_emit(json),L"utf-8",L"application/json",FALSE,FALSE);
    if (CkHttpW_getLastMethodSuccess(http) == FALSE) {
        wprintf(L"%s\n",CkHttpW_lastErrorText(http));
        CkStringBuilderW_Dispose(sbToken);
        CkJsonObjectW_Dispose(json);
        CkHttpW_Dispose(http);
        return;
    }

    responseCode = CkHttpResponseW_getStatusCode(resp);
    if (responseCode == 401) {
        wprintf(L"%s\n",CkHttpResponseW_bodyStr(resp));
        wprintf(L"If invalid credentials, then it is likely the access token expired.\n");
        wprintf(L"Your app should automatically fetch a new access token and re-try.\n");
        CkHttpResponseW_Dispose(resp);
        CkStringBuilderW_Dispose(sbToken);
        CkJsonObjectW_Dispose(json);
        CkHttpW_Dispose(http);
        return;
    }

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

    wprintf(L"Response code: %d\n",responseCode);
    wprintf(L"Response body\n");
    wprintf(L"%s\n",CkHttpResponseW_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"
    //  }
    // }

    CkHttpResponseW_Dispose(resp);


    CkStringBuilderW_Dispose(sbToken);
    CkJsonObjectW_Dispose(json);
    CkHttpW_Dispose(http);

    }