(Swift 3,4,5...) Google Cloud Storage List Buckets

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Demonstrates how to retrieve a list of buckets for a given project.

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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"

    let jsonToken = CkoJsonObject()!
    var success: Bool = jsonToken.loadFile("qa_data/tokens/googleCloudStorage.json")
    if success == false {
        print("\(jsonToken.lastErrorText!)")
        return
    }

    let http = CkoHttp()!
    http.authToken = jsonToken.string(of: "access_token")

    // For more info see Cloud Storage Documentation - Buckets: list 
    // 
    success = http.setUrlVar("PROJECT_ID", value: "chilkattest-1050")
    var resp: CkoHttpResponse? = http.quickGetObj("https://www.googleapis.com/storage/v1/b?project={$PROJECT_ID}")
    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
    }

    print("Response code: \(responseCode)")
    print("Response body")

    let json = CkoJsonObject()!
    success = json.load(resp!.bodyStr)
    resp = nil

    json.emitCompact = false

    print("\(json.emit()!)")

    // A response code = 200 indicates success, and the response body contains JSON such as this:

    // {
    //   "kind": "storage#buckets",
    //   "items": [
    //     {
    //       "kind": "storage#bucket",
    //       "id": "chilkat-bucket",
    //       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-bucket",
    //       "projectNumber": "5332332985",
    //       "name": "chilkat-bucket",
    //       "timeCreated": "2018-10-23T00:04:44.507Z",
    //       "updated": "2018-10-23T00:04:44.507Z",
    //       "metageneration": "1",
    //       "iamConfiguration": {
    //         "bucketPolicyOnly": {
    //           "enabled": false
    //         }
    //       },
    //       "location": "US",
    //       "storageClass": "MULTI_REGIONAL",
    //       "etag": "CAE="
    //     },
    //     {
    //       "kind": "storage#bucket",
    //       "id": "chilkat-images",
    //       "selfLink": "https://www.googleapis.com/storage/v1/b/chilkat-images",
    //       "projectNumber": "5332332985",
    //       "name": "chilkat-images",
    //       "timeCreated": "2018-10-23T11:24:43.000Z",
    //       "updated": "2018-10-23T11:24:43.000Z",
    //       "metageneration": "1",
    //       "iamConfiguration": {
    //         "bucketPolicyOnly": {
    //           "enabled": false
    //         }
    //       },
    //       "location": "US",
    //       "storageClass": "MULTI_REGIONAL",
    //       "etag": "CAE="
    //     }
    //   ]
    // }

    // Use this online tool to generate parsing code from sample JSON: 
    // Generate Parsing Code from JSON

    var kind: String?
    var i: Int
    var count_i: Int
    var id: String?
    var selfLink: String?
    var projectNumber: String?
    var name: String?
    var timeCreated: String?
    var updated: String?
    var metageneration: String?
    var iamConfigurationBucketPolicyOnlyEnabled: Bool
    var location: String?
    var storageClass: String?
    var etag: String?

    kind = json.string(of: "kind")
    i = 0
    count_i = json.size(ofArray: "items").intValue
    while i < count_i {
        json.i = i
        kind = json.string(of: "items[i].kind")
        id = json.string(of: "items[i].id")
        selfLink = json.string(of: "items[i].selfLink")
        projectNumber = json.string(of: "items[i].projectNumber")
        name = json.string(of: "items[i].name")
        timeCreated = json.string(of: "items[i].timeCreated")
        updated = json.string(of: "items[i].updated")
        metageneration = json.string(of: "items[i].metageneration")
        iamConfigurationBucketPolicyOnlyEnabled = json.bool(of: "items[i].iamConfiguration.bucketPolicyOnly.enabled")
        location = json.string(of: "items[i].location")
        storageClass = json.string(of: "items[i].storageClass")
        etag = json.string(of: "items[i].etag")
        i = i + 1
    }


}