(Swift 3,4,5...) Manage Bucket Storage Class

See more Google Cloud Storage Examples

Demonstrates how to manage a bucket's default storage class.

See Cloud Storage Classes for information about storage classes.

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func chilkatTest() {
    // 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..
    let sbToken = CkoStringBuilder()!
    sbToken.loadFile("qa_data/tokens/googleCloudStorageAccessToken.txt", charset: "utf-8")

    // ---- Step 1
    // Create the JSON body of the PUT request that will be sent.

    // {
    //   "storageClass": "[STORAGE_CLASS]"
    // }
    // 

    let json = CkoJsonObject()!
    // Be careful if using the "regional" storage class.  See the note below about the 400 error response.
    json.update("storageClass", value: "nearline")

    // ---- Step 2
    // Send a PUT equivalent to this curl command

    // curl -X PUT --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=storageClass"

    let http = CkoHttp()!
    http.authToken = sbToken.getAsString()

    http.setUrlVar("bucket_name", value: "chilkat-ocean")
    var url: String? = "https://www.googleapis.com/storage/v1/b/{$bucket_name}?fields=storageClass"
    var resp: CkoHttpResponse? = http.pText("PUT", url: url, textData: json.emit(), charset: "utf-8", contentType: "application/json", md5: false, gzip: false)
    if http.lastMethodSuccess == false {
        print("\(http.lastErrorText!)")
        return
    }

    var responseCode: Int = resp!.statusCode.intValue
    if responseCode == 401 {
        print("\(resp!.bodyStr!)")
        print("If invalid credentials, then it is likely the access token expired.")
        print("Your app should automatically fetch a new access token and re-try.")
        resp = nil
        return
    }

    // On my first try at running this code, I received the following error response:
    // Response code: 400
    // Response body
    // {
    //  "error": {
    //   "errors": [
    //    {
    //     "domain": "global",
    //     "reason": "invalid",
    //     "message": "The combination of locationConstraint and storageClass you provided is not supported for your project"
    //    }
    //   ],
    //   "code": 400,
    //   "message": "The combination of locationConstraint and storageClass you provided is not supported for your project"
    //  }
    // }
    // 

    // This was because my storage location was a Multi-regional location, and I tried to assign the "regional" storage class,
    // which is not allowed. 

    print("Response code: \(responseCode)")
    print("Response body")
    print("\(resp!.bodyStr!)")

    // A response code = 200 indicates success, and the response body contains the JSON
    // 
    // Response code: 200
    // Response body
    // {
    //  "storageClass": "NEARLINE"
    // }
    // 

    resp = nil

}