(PureBasic) Manage Cloud Storage Bucket Labels

See more Google Cloud Storage Examples

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

Chilkat PureBasic Module Download Chilkat PureBasic Module

IncludeFile "CkHttpResponse.pb"
IncludeFile "CkHttp.pb"
IncludeFile "CkStringBuilder.pb"
IncludeFile "CkJsonObject.pb"

Procedure ChilkatExample()

    ; 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.i = CkStringBuilder::ckCreate()
    If sbToken.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkStringBuilder::ckLoadFile(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".
    json.i = CkJsonObject::ckCreate()
    If json.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkJsonObject::ckUpdateString(json,"labels.b","bbb")
    CkJsonObject::ckUpdateString(json,"labels.test","abc123")
    CkJsonObject::ckUpdateNull(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"

    http.i = CkHttp::ckCreate()
    If http.i = 0
        Debug "Failed to create object."
        ProcedureReturn
    EndIf

    CkHttp::setCkAuthToken(http, CkStringBuilder::ckGetAsString(sbToken))

    CkHttp::ckSetUrlVar(http,"bucket_name","chilkat-ocean")
    url.s = "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=labels"
    resp.i = CkHttp::ckPText(http,"PATCH",url,CkJsonObject::ckEmit(json),"utf-8","application/json",0,0)
    If CkHttp::ckLastMethodSuccess(http) = 0
        Debug CkHttp::ckLastErrorText(http)
        CkStringBuilder::ckDispose(sbToken)
        CkJsonObject::ckDispose(json)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

    responseCode.i = CkHttpResponse::ckStatusCode(resp)
    If responseCode = 401
        Debug CkHttpResponse::ckBodyStr(resp)
        Debug "If invalid credentials, then it is likely the access token expired."
        Debug "Your app should automatically fetch a new access token and re-try."
        CkHttpResponse::ckDispose(resp)

        CkStringBuilder::ckDispose(sbToken)
        CkJsonObject::ckDispose(json)
        CkHttp::ckDispose(http)
        ProcedureReturn
    EndIf

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

    Debug "Response code: " + Str(responseCode)
    Debug "Response body"
    Debug CkHttpResponse::ckBodyStr(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"
    ;  }
    ; }

    CkHttpResponse::ckDispose(resp)



    CkStringBuilder::ckDispose(sbToken)
    CkJsonObject::ckDispose(json)
    CkHttp::ckDispose(http)


    ProcedureReturn
EndProcedure