(Swift 3,4,5...) Auth0 Server-to-Server Access Token (Client Credentials flow)

Demonstrates how to obtain an Auth0 access token using client credentials (client_id and client_secret).

This is just a matter of duplicating this CURL command:

curl --request POST
  --url 'https://chilkat.auth0.com/oauth/token' \
  --header 'content-type: application/json' \
  --data '{"grant_type":"client_credentials","client_id": "xxxx","client_secret": "xxxx","audience": "https://api.example.com/geocoding/v1/"}'

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func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // We want to duplicate this curl command:
    // 
    // curl --request POST
    //   --url 'https://chilkat.auth0.com/oauth/token' \
    //   --header 'content-type: application/json' \
    //   --data '{"grant_type":"client_credentials","client_id": "my_client_id","client_secret": "my_client_secret","audience": "https://api.example.com/geocoding/v1/"}'

    // Build the JSON body of the request.
    let json = CkoJsonObject()!
    json.update("grant_type", value: "client_credentials")
    json.update("client_id", value: "AUTH0-CLIENT-ID")
    json.update("client_secret", value: "AUTH0-CLIENT-SECRET")
    json.update("audience", value: "https://api.example.com/geocoding/v1/")

    // IMPORTANT: You would use your own url.  You would not use "chilkat.auth0.com".  
    // Instead you would use "your_name.auth0.com"
    let http = CkoHttp()!
    var resp: CkoHttpResponse? = http.postJson3("https://chilkat.auth0.com/oauth/token", contentType: "application/json", json: json)
    if http.lastMethodSuccess != true {
        print("\(http.lastErrorText!)")
        return
    }

    // A 200 response status code indicates success.  In the success case, the response body
    // contains the JSON access token, such as: 
    // {
    //   "access_token": "eyJz93a...k4laUWw",
    //   "token_type":"Bearer",
    //   "expires_in":86400
    // }
    // 

    print("response status code = \(resp!.statusCode.intValue)")

    // The repsonse is JSON if successful and also JSON for errors.
    let jsonResp = CkoJsonObject()!
    jsonResp.emitCompact = false
    jsonResp.load(resp!.bodyStr)

    if resp!.statusCode.intValue != 200 {
        // The response body contains error information in JSON format.
        print("\(jsonResp.emit()!)")
        resp = nil

        // An example of an error response:
        // 		{
        // 		  "error": "access_denied",
        // 		  "error_description": "Client is not authorized to access \"https://api.example.com/geocoding/v1/\". You might probably want to create a \"client-grant\" associated to this API. See: https://auth0.com/docs/api/v2#!/Client_Grants/post_client_grants"
        // 		}
        return
    }

    print("Success!")
    print("\(jsonResp.emit()!)")

    // A successful JSON response body looks like this:

    // {
    //   "access_token": "eyJz93a...k4laUWw",
    //   "token_type":"Bearer",
    //   "expires_in":86400
    // }

    resp = nil

}